From 419cc37de5556907c157df6dbc7cfa249577dc6a Mon Sep 17 00:00:00 2001 From: Abhinav Gupta Date: Tue, 11 Oct 2022 06:28:33 -0700 Subject: [PATCH 1/5] Add machinery for verified docs This adds a new docs/ folder to the Fx repository. This is where non-API-reference documentation will reside. To set things up, this adds a docs/CONTRIBUTING.md with guidance on how to contribute to the Fx documentation. It includes tooling to ensure that code snippets inside documentation remain up to date. To do that, this relies on two tools: - mdox does the bulk of the heavy lifting here - the region shell script helps pick out named snippets of code from a flie --- Makefile | 13 +- docs/CONTRIBUTING.md | 164 ++++++++ docs/Makefile | 22 + docs/bin/region | 38 ++ tools/go.mod | 65 +++ tools/go.sum | 982 +++++++++++++++++++++++++++++++++++++++++++ tools/tools.go | 1 + 7 files changed, 1283 insertions(+), 2 deletions(-) create mode 100644 docs/CONTRIBUTING.md create mode 100644 docs/Makefile create mode 100755 docs/bin/region diff --git a/Makefile b/Makefile index 90455f003..4f28539ac 100644 --- a/Makefile +++ b/Makefile @@ -3,12 +3,13 @@ export GOBIN ?= $(shell pwd)/bin GOLINT = $(GOBIN)/golint STATICCHECK = $(GOBIN)/staticcheck FXLINT = $(GOBIN)/fxlint +MDOX = $(GOBIN)/mdox GO_FILES = $(shell \ find . '(' -path '*/.*' -o -path './vendor' -o -path '*/testdata/*' ')' -prune \ -o -name '*.go' -print | cut -b3-) -MODULES = . ./tools +MODULES = . ./tools ./docs .PHONY: build build: @@ -36,11 +37,14 @@ $(GOLINT): tools/go.mod $(STATICCHECK): tools/go.mod cd tools && go install honnef.co/go/tools/cmd/staticcheck +$(MDOX): tools/go.mod + cd tools && go install github.com/bwplotka/mdox + $(FXLINT): tools/cmd/fxlint/main.go cd tools && go install go.uber.org/fx/tools/cmd/fxlint .PHONY: lint -lint: $(GOLINT) $(STATICCHECK) $(FXLINT) +lint: $(GOLINT) $(STATICCHECK) $(FXLINT) docs-check @rm -rf lint.log @echo "Checking formatting..." @gofmt -d -s $(GO_FILES) 2>&1 | tee lint.log @@ -64,6 +68,11 @@ lint: $(GOLINT) $(STATICCHECK) $(FXLINT) git --no-pager diff; \ fi +.PHONY: docs-check +docs-check: $(MDOX) + @echo "Checking documentation" + @make -C docs check | tee -a lint.log + .PHONY: tidy tidy: @$(foreach dir,$(MODULES),(cd $(dir) && go mod tidy) &&) true diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md new file mode 100644 index 000000000..ea1b7f6c5 --- /dev/null +++ b/docs/CONTRIBUTING.md @@ -0,0 +1,164 @@ +# Contributing to Fx Documentation + +If you'd like to contribute to Fx's documentation, read this first. + +## Document by purpose + +Documentation in this folder should fall in one of the following categories. + +- **Tutorials**: These hold step-by-step instructions for an end-to-end project + that a beginner could follow along to. + Don't spend time explaining things. + If explanations are available elsewhere, link to them. + These are entry points to answer the prompt, + "I don't know what Fx is, show me what it can do," + so there won't be too many of these. +- **Explanations**: These hold long-form explanations of concepts and ideas. + These are intended to build an understanding of Fx. + Feel free to go wild here--use learning aids like diagrams, tables, etc. +- **How-tos**: These are step-by-step instructions for a *specific problem*. + Unlike tutorials, these are not meant to be end-to-end. + Feel free to leave things out, make assumptions, + or provide options ("if you're doing this, do this"). + As with tutorials, don't spend time explaining; + link to explanations elsewhere. + +As an example, + +- A tutorial will use lifecycle hooks as part of + a larger set of instructions for a full end-to-end application. +- An explanation will explain what lifecycle hooks are, how they work, + when and how you should use them, and link to relevant APIs and guides. +- A how-to guide will demonstrate how to use lifecycle hooks + with an HTTP server, a gRPC server, etc. + +This separation is inspired by the +[Divio documentation system](https://documentation.divio.com/), +which suggests separating documentation into four categories: +the three above, and references, which we get from our generated API reference. + +## Formatting + +### GitHub Flavored Markdown + +The documentation is hosted on GitHub, +and therefore it follows [GitHub Flavored Markdown](https://github.github.com/gfm/). + +### ATX-style headers + +Use ATX-style headers (`#`-prefixed), +not Setext-style (underlined with `===` or `---`). + +```markdown +Bad header +========== + +# Good header +``` + +### Semantic Line Breaks + +- **Do not** write overly long lines of text +- **Do not** "reflow" Markdown paragraphs +- **Do** use [Semantic Line Breaks](https://sembr.org/) to break these lines down + +```markdown +This is a bad paragraph because it's really long, all on one line. When I open this in a text editor, I'll have to scroll right. + +This is a bad paragraph because even though it's not all one one line, it adds +line breaks when it reaches the line length limit. This means that anytime I +change anything in this paragraph, I have to "reflow" it, which will change +other lines and make the change I'm making more difficult to review. + +This is a good paragraph. It uses semantic line breaks. +I can add words or modify an existing sentence, +or even parts of a sentence, +easily and without affecting other lines. +When I change something, the actual change I made is easy to review. +Markdown will reflow this into a "normal" pargraph when rendering. +``` + +## Test everything + +All code samples in documentation must be buildable and testable. + +To aid in this, we have two tools: + +- [mdox] lets us ensure that the contents of a code block are up-to-date +- the `region` shell script allows us to extract parts of a code sample + +### mdox + +mdox is a Markdown file formatter that includes support for +running a command and using its output as part of a code block. +To use this, declare a regular code block and tag it with `mdoc-exec`. + +```markdown +```go mdox-exec="cat foo.go" +// doesn't matter +``` + +The contents of the code block will be replaced +with the output of the command when you run `make fmt`. +`make check` will ensure that the contents are up-to-date. + +The command runs inside the directory where the Markdown file resides. +All paths should be relative to that directory. + +### region + +The `region` shell script is a command intended to be used with `mdox-exec`. + +```plain mdox-exec="region" mdox-expect-exit-code="1" +USAGE: region FILE REGION1 REGION2 ... + +Extracts text from FILE marked by "// region" blocks. +``` + +For example, given the file: + +``` +foo +// region myregion +bar +// endregion myregion +baz +``` + +Running `region $FILE myregion` will print: + +``` +bar +``` + +The same region name may be used multiple times +to pull different snippets from the same file. +For example, given the file: + +```go +// region provide-foo +func main() { + fx.New( + fx.Provide( + NewFoo, + // endregion provide-foo + NewBar, + // region provide-foo + ), + ).Run() +} + +// endregion provide-foo +``` + +`region $FILE provide-foo` will print, + +```go +func main() { + fx.New( + fx.Provide( + NewFoo, + ), + ).Run() +} +``` diff --git a/docs/Makefile b/docs/Makefile new file mode 100644 index 000000000..de1d7eb26 --- /dev/null +++ b/docs/Makefile @@ -0,0 +1,22 @@ +export PATH := $(shell pwd)/bin:$(PATH) + +MDOX = $(shell pwd)/../bin/mdox +MDOX_FMT_FLAGS = --soft-wraps --links.validate +MD_FILES = $(shell find . -name '*.md') + +.PHONY: +fmt: $(MDOX) + @$(foreach FILE,$(MD_FILES), \ + (cd $(dir $(FILE)) && \ + echo "[mdox fmt] $(FILE)" && \ + $(MDOX) fmt $(MDOX_FMT_FLAGS) $(notdir $(FILE)));) + +.PHONY: +check: $(MDOX) + @$(foreach FILE,$(MD_FILES), \ + (cd $(dir $(FILE)) && \ + echo "[mdox check] $(FILE)" && \ + $(MDOX) fmt --check $(MDOX_FMT_FLAGS) $(notdir $(FILE)));) + +$(MDOX): + make -C .. $(shell pwd)/bin/mdox diff --git a/docs/bin/region b/docs/bin/region new file mode 100755 index 000000000..08862f48f --- /dev/null +++ b/docs/bin/region @@ -0,0 +1,38 @@ +#!/usr/bin/env bash +set -euo pipefail +IFS=$'\n\t' + +if [[ $# -ne 2 ]]; then + echo >&2 'USAGE: region FILE REGION1 REGION2 ...' + echo >&2 + echo >&2 'Extracts text from FILE marked by "// region" blocks.' + exit 1 +fi + +file="$1"; shift + +args=(-n) +for region in "$@"; do + # sed syntax: + # We can either use /regex/, or \CregexC for any C. + # Since we need to match on "//", we use "#" as the regex delimiter. + # + # And we can use $expr1,$expr2p to say "print lines inside that + # region." + open='\#// region '"$region"'$#' + close='\#// endregion '"$region"'$#' + args+=(-e "${open},${close}p") +done + +sed -n "${args[@]}" "$file" | + grep -Ev '// (end)?region \S+$' | + perl -ne ' + # Remove a leading/trailing empty line, if any. + if ((!$saw_first || eof) && /^\s*$/) { + next; + } + $saw_first = true; + + s/\t/ /g; + print; + ' diff --git a/tools/go.mod b/tools/go.mod index a0aebd3e3..9686088e1 100644 --- a/tools/go.mod +++ b/tools/go.mod @@ -3,6 +3,7 @@ module go.uber.org/fx/tools go 1.19 require ( + github.com/bwplotka/mdox v0.9.0 golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 golang.org/x/tools v0.1.11-0.20220513221640-090b14e8501f honnef.co/go/tools v0.3.3 @@ -10,7 +11,71 @@ require ( require ( github.com/BurntSushi/toml v1.0.0 // indirect + github.com/Kunde21/markdownfmt/v2 v2.1.1-0.20210810103848-727f02f4c51c // indirect + github.com/PuerkitoBio/goquery v1.5.1 // indirect + github.com/alecthomas/chroma v0.8.2 // indirect + github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect + github.com/alecthomas/units v0.0.0-20210208195552-ff826a37aa15 // indirect + github.com/andybalholm/cascadia v1.2.0 // indirect + github.com/antchfx/htmlquery v1.2.3 // indirect + github.com/antchfx/xmlquery v1.3.4 // indirect + github.com/antchfx/xpath v1.1.10 // indirect + github.com/aymerick/douceur v0.2.0 // indirect + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.1.1 // indirect + github.com/charmbracelet/glamour v0.3.0 // indirect + github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 // indirect + github.com/dlclark/regexp2 v1.2.0 // indirect + github.com/efficientgo/tools/core v0.0.0-20210609125236-d73259166f20 // indirect + github.com/efficientgo/tools/extkingpin v0.0.0-20210609125236-d73259166f20 // indirect + github.com/fatih/color v1.7.0 // indirect + github.com/felixge/fgprof v0.9.1 // indirect + github.com/go-kit/kit v0.10.0 // indirect + github.com/go-logfmt/logfmt v0.5.0 // indirect + github.com/gobwas/glob v0.2.3 // indirect + github.com/gocolly/colly/v2 v2.1.1-0.20201013153555-8252c346cfb0 // indirect + github.com/gohugoio/hugo v0.74.3 // indirect + github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect + github.com/golang/protobuf v1.4.3 // indirect + github.com/google/pprof v0.0.0-20200708004538-1a94d8640e99 // indirect + github.com/gorilla/css v1.0.0 // indirect + github.com/kennygrant/sanitize v1.2.4 // indirect + github.com/lucasb-eyer/go-colorful v1.2.0 // indirect + github.com/mattn/go-colorable v0.1.6 // indirect + github.com/mattn/go-isatty v0.0.12 // indirect + github.com/mattn/go-runewidth v0.0.13 // indirect + github.com/mattn/go-shellwords v1.0.10 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect + github.com/microcosm-cc/bluemonday v1.0.6 // indirect + github.com/mitchellh/mapstructure v1.2.2 // indirect + github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68 // indirect + github.com/muesli/termenv v0.8.1 // indirect + github.com/niklasfasching/go-org v1.3.0 // indirect + github.com/oklog/run v1.1.0 // indirect + github.com/olekukonko/tablewriter v0.0.5 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.11.0 // indirect + github.com/prometheus/client_model v0.2.0 // indirect + github.com/prometheus/common v0.30.0 // indirect + github.com/prometheus/procfs v0.6.0 // indirect + github.com/rivo/uniseg v0.2.0 // indirect + github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca // indirect + github.com/sergi/go-diff v1.0.0 // indirect + github.com/spf13/afero v1.2.2 // indirect + github.com/spf13/cast v1.3.1 // indirect + github.com/spf13/jwalterweatherman v1.1.0 // indirect + github.com/temoto/robotstxt v1.1.1 // indirect + github.com/theckman/yacspin v0.8.0 // indirect + github.com/yuin/goldmark v1.4.1 // indirect + github.com/yuin/goldmark-emoji v1.0.1 // indirect golang.org/x/exp/typeparams v0.0.0-20220314205449-43aec2f8a4e7 // indirect golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect + golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f // indirect golang.org/x/sys v0.0.0-20220315194320-039c03cc5b86 // indirect + golang.org/x/text v0.3.7 // indirect + google.golang.org/appengine v1.6.6 // indirect + google.golang.org/protobuf v1.26.0-rc.1 // indirect + gopkg.in/alecthomas/kingpin.v2 v2.2.6 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect ) diff --git a/tools/go.sum b/tools/go.sum index 2bebf7efb..ff6e73d30 100644 --- a/tools/go.sum +++ b/tools/go.sum @@ -1,25 +1,1007 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.37.4/go.mod h1:NHPJ89PdicEuT9hdPXMROBD91xc5uRDxsMtSB16k7hw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.39.0/go.mod h1:rVLT6fkc8chs9sfPtFc1SBH6em7n+ZoXaG+87tDISts= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= +cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= +cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= +cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= +cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= +cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY= +cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= +cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE= +cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc= +cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg= +cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc= +cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ= +cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= +cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk= +cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I= +cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw= +cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA= +cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU= +cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw= +cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos= +cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk= +cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs= +cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0= +contrib.go.opencensus.io/exporter/aws v0.0.0-20181029163544-2befc13012d0/go.mod h1:uu1P0UCM/6RbsMrgPa98ll8ZcHM858i/AD06a9aLRCA= +contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA= +contrib.go.opencensus.io/exporter/stackdriver v0.11.0/go.mod h1:hA7rlmtavV03FGxzWXAPBUnZeZBhWN/QYQAuMtxc9Bk= +contrib.go.opencensus.io/integrations/ocsql v0.1.4/go.mod h1:8DsSdjz3F+APR+0z0WkU1aRorQCFfRxvqjUUPMbF3fE= +contrib.go.opencensus.io/resource v0.0.0-20190131005048-21591786a5e0/go.mod h1:F361eGI91LCmW1I/Saf+rX0+OFcigGlFvXwEGEnkRLA= +dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= +github.com/Azure/azure-amqp-common-go v1.1.3/go.mod h1:FhZtXirFANw40UXI2ntweO+VOkfaw8s6vZxUiRhLYW8= +github.com/Azure/azure-amqp-common-go 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h1:4/cbmt4EJXSKlG6LCfWHoqmN0uFdy5i/+YFz+fTfhV4= +pack.ag/amqp v0.11.0/go.mod h1:4/cbmt4EJXSKlG6LCfWHoqmN0uFdy5i/+YFz+fTfhV4= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= +rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= +rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= +sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= +sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU= diff --git a/tools/tools.go b/tools/tools.go index 9ea2aba1a..b88ecf497 100644 --- a/tools/tools.go +++ b/tools/tools.go @@ -25,6 +25,7 @@ package fx import ( // Tools we use during development. + _ "github.com/bwplotka/mdox" _ "golang.org/x/lint/golint" _ "honnef.co/go/tools/cmd/staticcheck" ) From 06070daad4f761e989e5859955daa5ee7d639913 Mon Sep 17 00:00:00 2001 From: Abhinav Gupta Date: Tue, 11 Oct 2022 06:31:22 -0700 Subject: [PATCH 2/5] docs: Add get-started tutorial This adds a "Getting started with Fx" tutorial. The tutorial is intended to be a simple step-by-step with minimal explanations that a user can follow along to. At the end of the tutorial, they'll have encountered: - basic dependency injection - named values - value groups --- docs/get-started/01-minimal/main.go | 31 + docs/get-started/02-http-server/main.go | 73 ++ docs/get-started/03-echo-handler/main.go | 104 +++ docs/get-started/04-logger/main.go | 109 +++ docs/get-started/05-registration/main.go | 125 +++ docs/get-started/06-another-handler/main.go | 180 +++++ docs/get-started/07-many-handlers/main.go | 172 +++++ docs/get-started/README.md | 801 ++++++++++++++++++++ docs/go.mod | 18 + docs/go.sum | 64 ++ 10 files changed, 1677 insertions(+) create mode 100644 docs/get-started/01-minimal/main.go create mode 100644 docs/get-started/02-http-server/main.go create mode 100644 docs/get-started/03-echo-handler/main.go create mode 100644 docs/get-started/04-logger/main.go create mode 100644 docs/get-started/05-registration/main.go create mode 100644 docs/get-started/06-another-handler/main.go create mode 100644 docs/get-started/07-many-handlers/main.go create mode 100644 docs/get-started/README.md create mode 100644 docs/go.mod create mode 100644 docs/go.sum diff --git a/docs/get-started/01-minimal/main.go b/docs/get-started/01-minimal/main.go new file mode 100644 index 000000000..614142de5 --- /dev/null +++ b/docs/get-started/01-minimal/main.go @@ -0,0 +1,31 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +// region main + +package main + +import "go.uber.org/fx" + +func main() { + fx.New().Run() +} + +// endregion main diff --git a/docs/get-started/02-http-server/main.go b/docs/get-started/02-http-server/main.go new file mode 100644 index 000000000..0b6feef42 --- /dev/null +++ b/docs/get-started/02-http-server/main.go @@ -0,0 +1,73 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "context" + "fmt" + "net" + "net/http" + + "go.uber.org/fx" +) + +// region provide-server +func main() { + // region app + fx.New( + fx.Provide(NewHTTPServer), + // endregion provide-server + fx.Invoke(func(*http.Server) {}), + // region provide-server + ).Run() + // endregion app +} + +// endregion provide-server + +// region partial + +// NewHTTPServer builds an HTTP server that will begin serving requests +// when the Fx application starts. +// region full +func NewHTTPServer(lc fx.Lifecycle) *http.Server { + srv := &http.Server{Addr: ":8080"} + // endregion partial + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + fmt.Println("Starting HTTP server at", srv.Addr) + go srv.Serve(ln) + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + // region partial + return srv +} + +// endregion partial +// region full diff --git a/docs/get-started/03-echo-handler/main.go b/docs/get-started/03-echo-handler/main.go new file mode 100644 index 000000000..0384bdc94 --- /dev/null +++ b/docs/get-started/03-echo-handler/main.go @@ -0,0 +1,104 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "context" + "fmt" + "io" + "net" + "net/http" + "os" + + "go.uber.org/fx" +) + +func main() { + fx.New( + // region provides + // region provide-handler + fx.Provide( + NewHTTPServer, + // endregion provide-handler + NewServeMux, + // region provide-handler + NewEchoHandler, + ), + // endregion provides + fx.Invoke(func(*http.Server) {}), + // endregion provide-handler + ).Run() +} + +// region serve-mux + +// NewServeMux builds a ServeMux that will route requests +// to the given EchoHandler. +func NewServeMux(echo *EchoHandler) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle("/echo", echo) + return mux +} + +// endregion serve-mux + +// region echo-handler + +// EchoHandler is an http.Handler that copies its request body +// back to the response. +type EchoHandler struct{} + +// NewEchoHandler builds a new EchoHandler. +func NewEchoHandler() *EchoHandler { + return &EchoHandler{} +} + +// ServeHTTP handles an HTTP request to the /echo endpoint. +func (*EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + fmt.Fprintln(os.Stderr, "Failed to handle request:", err) + } +} + +// endregion echo-handler + +// NewHTTPServer builds an HTTP server that will begin serving requests +// when the Fx application starts. +// region connect-mux +func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + // endregion connect-mux + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + fmt.Println("Starting HTTP server at", srv.Addr) + go srv.Serve(ln) + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + return srv +} diff --git a/docs/get-started/04-logger/main.go b/docs/get-started/04-logger/main.go new file mode 100644 index 000000000..e229b6f43 --- /dev/null +++ b/docs/get-started/04-logger/main.go @@ -0,0 +1,109 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "context" + "io" + "net" + "net/http" + + "go.uber.org/fx" + "go.uber.org/fx/fxevent" + "go.uber.org/zap" +) + +// region fx-logger +func main() { + fx.New( + fx.WithLogger(func(log *zap.Logger) fxevent.Logger { + return &fxevent.ZapLogger{Logger: log} + }), + // endregion fx-logger + // region provides + fx.Provide( + NewHTTPServer, + NewServeMux, + NewEchoHandler, + zap.NewExample, + ), + // endregion provides + fx.Invoke(func(*http.Server) {}), + ).Run() +} + +// NewServeMux builds a ServeMux that will route requests +// to the given EchoHandler. +func NewServeMux(echo *EchoHandler) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle("/echo", echo) + return mux +} + +// EchoHandler is an http.Handler that copies its request body +// back to the response. +// region echo-init +type EchoHandler struct { + log *zap.Logger +} + +// endregion echo-init + +// NewEchoHandler builds a new EchoHandler. +// region echo-init +func NewEchoHandler(log *zap.Logger) *EchoHandler { + return &EchoHandler{log: log} +} + +// endregion echo-init + +// ServeHTTP handles an HTTP request to the /echo endpoint. +// region echo-serve +func (h *EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + h.log.Warn("Failed to handle request", zap.Error(err)) + } +} + +// endregion echo-serve + +// NewHTTPServer builds an HTTP server that will begin serving requests +// when the Fx application starts. +// region http-server +func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux, log *zap.Logger) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + log.Info("Starting HTTP server", zap.String("addr", srv.Addr)) + go srv.Serve(ln) + // endregion http-server + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + return srv +} diff --git a/docs/get-started/05-registration/main.go b/docs/get-started/05-registration/main.go new file mode 100644 index 000000000..ead1deab0 --- /dev/null +++ b/docs/get-started/05-registration/main.go @@ -0,0 +1,125 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "context" + "io" + "net" + "net/http" + + "go.uber.org/fx" + "go.uber.org/fx/fxevent" + "go.uber.org/zap" +) + +func main() { + fx.New( + fx.WithLogger(func(log *zap.Logger) fxevent.Logger { + return &fxevent.ZapLogger{Logger: log} + }), + // region provides + fx.Provide( + NewHTTPServer, + NewServeMux, + fx.Annotate( + NewEchoHandler, + fx.As(new(Route)), + ), + zap.NewExample, + ), + // endregion provides + fx.Invoke(func(*http.Server) {}), + ).Run() +} + +// region route + +// Route is an http.Handler that knows the mux pattern +// under which it will be registered. +type Route interface { + http.Handler + + // Pattern reports the path at which this is registered. + Pattern() string +} + +// endregion route + +// region mux + +// NewServeMux builds a ServeMux that will route requests +// to the given Route. +func NewServeMux(route Route) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle(route.Pattern(), route) + return mux +} + +// endregion mux + +// EchoHandler is an http.Handler that copies its request body +// back to the response. +type EchoHandler struct { + log *zap.Logger +} + +// NewEchoHandler builds a new EchoHandler. +func NewEchoHandler(log *zap.Logger) *EchoHandler { + return &EchoHandler{log: log} +} + +// Pattern reports the pattern under which +// this handler should be registered. +// region echo-pattern +func (*EchoHandler) Pattern() string { + return "/echo" +} + +// endregion echo-pattern + +// ServeHTTP handles an HTTP request to the /echo endpoint. +func (h *EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + h.log.Warn("Failed to handle request", zap.Error(err)) + } +} + +// NewHTTPServer builds an HTTP server that will begin serving requests +// when the Fx application starts. +func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux, log *zap.Logger) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + log.Info("Starting HTTP server", zap.String("addr", srv.Addr)) + go srv.Serve(ln) + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + return srv +} diff --git a/docs/get-started/06-another-handler/main.go b/docs/get-started/06-another-handler/main.go new file mode 100644 index 000000000..a4c051add --- /dev/null +++ b/docs/get-started/06-another-handler/main.go @@ -0,0 +1,180 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "context" + "fmt" + "io" + "net" + "net/http" + + "go.uber.org/fx" + "go.uber.org/fx/fxevent" + "go.uber.org/zap" +) + +func main() { + fx.New( + fx.WithLogger(func(log *zap.Logger) fxevent.Logger { + return &fxevent.ZapLogger{Logger: log} + }), + // region mux-provide + fx.Provide( + NewHTTPServer, + fx.Annotate( + NewServeMux, + fx.ParamTags(`name:"echo"`, `name:"hello"`), + ), + // endregion mux-provide + // region hello-provide-partial + // region route-provides + fx.Annotate( + NewEchoHandler, + fx.As(new(Route)), + // endregion hello-provide-partial + fx.ResultTags(`name:"echo"`), + // region hello-provide-partial + ), + fx.Annotate( + NewHelloHandler, + fx.As(new(Route)), + // endregion hello-provide-partial + fx.ResultTags(`name:"hello"`), + // region hello-provide-partial + ), + // endregion hello-provide-partial + // endregion route-provides + zap.NewExample, + ), + fx.Invoke(func(*http.Server) {}), + ).Run() +} + +// Route is an http.Handler that knows the mux pattern +// under which it will be registered. +type Route interface { + http.Handler + + // Pattern reports the path at which this is registered. + Pattern() string +} + +// region mux + +// NewServeMux builds a ServeMux that will route requests +// to the given routes. +func NewServeMux(route1, route2 Route) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle(route1.Pattern(), route1) + mux.Handle(route2.Pattern(), route2) + return mux +} + +// endregion mux + +// region hello-init + +// HelloHandler is an HTTP handler that +// prints a greeting to the user. +type HelloHandler struct { + log *zap.Logger +} + +// NewHelloHandler builds a new HelloHandler. +func NewHelloHandler(log *zap.Logger) *HelloHandler { + return &HelloHandler{log: log} +} + +// endregion hello-init + +// Pattern reports the pattern under which +// this handler should be registered. +// region hello-methods +func (*HelloHandler) Pattern() string { + return "/hello" +} + +// endregion hello-methods + +// ServeHTTP handles an HTTP request to the /hello endpoint. +// region hello-methods +func (h *HelloHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + body, err := io.ReadAll(r.Body) + if err != nil { + h.log.Error("Failed to read request", zap.Error(err)) + http.Error(w, "Internal server error", http.StatusInternalServerError) + return + } + + if _, err := fmt.Fprintf(w, "Hello, %s\n", body); err != nil { + h.log.Error("Failed to write response", zap.Error(err)) + http.Error(w, "Internal server error", http.StatusInternalServerError) + return + } +} + +// endregion hello-methods + +// EchoHandler is an http.Handler that copies its request body +// back to the response. +type EchoHandler struct { + log *zap.Logger +} + +// NewEchoHandler builds a new EchoHandler. +func NewEchoHandler(log *zap.Logger) *EchoHandler { + return &EchoHandler{log: log} +} + +// Pattern reports the pattern under which +// this handler should be registered. +func (*EchoHandler) Pattern() string { + return "/echo" +} + +// ServeHTTP handles an HTTP request to the /echo endpoint. +func (h *EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + h.log.Warn("Failed to handle request", zap.Error(err)) + } +} + +// NewHTTPServer builds an HTTP server that will begin serving requests +// when the Fx application starts. +func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux, log *zap.Logger) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + log.Info("Starting HTTP server", zap.String("addr", srv.Addr)) + go srv.Serve(ln) + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + return srv +} diff --git a/docs/get-started/07-many-handlers/main.go b/docs/get-started/07-many-handlers/main.go new file mode 100644 index 000000000..2dcccae1f --- /dev/null +++ b/docs/get-started/07-many-handlers/main.go @@ -0,0 +1,172 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "context" + "fmt" + "io" + "net" + "net/http" + + "go.uber.org/fx" + "go.uber.org/fx/fxevent" + "go.uber.org/zap" +) + +func main() { + fx.New( + fx.WithLogger(func(log *zap.Logger) fxevent.Logger { + return &fxevent.ZapLogger{Logger: log} + }), + // region mux-provide + // region route-provides + fx.Provide( + // endregion route-provides + NewHTTPServer, + fx.Annotate( + NewServeMux, + fx.ParamTags(`group:"routes"`), + ), + // endregion mux-provide + // region route-provides + AsRoute(NewEchoHandler), + AsRoute(NewHelloHandler), + zap.NewExample, + ), + // endregion route-provides + fx.Invoke(func(*http.Server) {}), + ).Run() +} + +// region AsRoute + +// AsRoute annotates the given constructor to state that +// it provides a route to the "routes" group. +func AsRoute(f any) any { + return fx.Annotate( + f, + fx.As(new(Route)), + fx.ResultTags(`group:"routes"`), + ) +} + +// endregion AsRoute + +// Route is an http.Handler that knows the mux pattern +// under which it will be registered. +type Route interface { + http.Handler + + // Pattern reports the path at which this is registered. + Pattern() string +} + +// NewServeMux builds a ServeMux that will route requests +// to the given routes. +// region mux +func NewServeMux(routes []Route) *http.ServeMux { + mux := http.NewServeMux() + for _, route := range routes { + mux.Handle(route.Pattern(), route) + } + return mux +} + +// endregion mux + +// HelloHandler is an HTTP handler that +// prints a greeting to the user. +type HelloHandler struct { + log *zap.Logger +} + +// NewHelloHandler builds a HelloHandler. +func NewHelloHandler(log *zap.Logger) *HelloHandler { + return &HelloHandler{log: log} +} + +// Pattern reports the mux pattern under which +// this handler should be registered. +func (*HelloHandler) Pattern() string { + return "/hello" +} + +// ServeHTTP handles a request to the /hello endpoint. +func (h *HelloHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + body, err := io.ReadAll(r.Body) + if err != nil { + h.log.Error("Failed to read request", zap.Error(err)) + http.Error(w, "Internal server error", http.StatusInternalServerError) + return + } + + if _, err := fmt.Fprintf(w, "Hello, %s\n", body); err != nil { + h.log.Error("Failed to write response", zap.Error(err)) + http.Error(w, "Internal server error", http.StatusInternalServerError) + return + } +} + +// EchoHandler is an http.Handler that copies its request body +// back to the response. +type EchoHandler struct { + log *zap.Logger +} + +// NewEchoHandler builds a new EchoHandler. +func NewEchoHandler(log *zap.Logger) *EchoHandler { + return &EchoHandler{log: log} +} + +// Pattern reports the mux pattern under which +// this handler should be registered. +func (*EchoHandler) Pattern() string { + return "/echo" +} + +// ServeHTTP handles an HTTP request to the /echo endpoint. +func (h *EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + h.log.Warn("Failed to handle request", zap.Error(err)) + } +} + +// NewHTTPServer builds an HTTP server that will begin serving requests +// when the Fx application starts. +func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux, log *zap.Logger) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + log.Info("Starting HTTP server", zap.String("addr", srv.Addr)) + go srv.Serve(ln) + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + return srv +} diff --git a/docs/get-started/README.md b/docs/get-started/README.md new file mode 100644 index 000000000..28a55543c --- /dev/null +++ b/docs/get-started/README.md @@ -0,0 +1,801 @@ +# Getting started with Fx + +This introduces you to the basics of Fx. +In this tutorial you will: + +- [start an empty application](#start-an-empty-application) +- [add an HTTP server to it](#add-an-http-server) +- [register a handler with the server](#register-a-handler) +- [add logging to your application](#add-a-logger) +- [refactor to loosen coupling to your handler](#decouple-registration) +- [add another handler to the server](#register-another-handler) +- [generalize your implementation](#register-many-handlers) + +## Start an empty application + +Let's build the hello-world equivalent of an Fx application. +This application won't do anything yet except print a bunch of logs. + +1. Start a new empty project. + + ```bash + mkdir fxdemo + cd fxdemo + go mod init example.com/fxdemo + ``` + +2. Install the latest version of Fx. + + ```bash + go get go.uber.org/fx@latest + ``` + +3. Write a minimal `main.go`. + + ```go mdox-exec="region 01-minimal/main.go main" + package main + + import "go.uber.org/fx" + + func main() { + fx.New().Run() + } + ``` + +4. Run the application. + + ```bash + go run . + ``` + + You'll see output similar to the following. + + ``` + [Fx] PROVIDE fx.Lifecycle <= go.uber.org/fx.New.func1() + [Fx] PROVIDE fx.Shutdowner <= go.uber.org/fx.(*App).shutdowner-fm() + [Fx] PROVIDE fx.DotGraph <= go.uber.org/fx.(*App).dotGraph-fm() + [Fx] RUNNING + ``` + + This shows the default objects provided to the Fx application, + but it doesn't do anything meaningful yet. + Stop the application with `Ctrl-C`. + + ``` + [Fx] RUNNING + ^C + [Fx] INTERRUPT + ``` + +**What did we just do?** + +We build an empty Fx application by calling `fx.New` with no arguments. +Applications will normally pass arguments to `fx.New` to set up their +components. + +We then run this application with the `App.Run` method. +This method blocks until it receives a signal to stop, +and it then runs any cleanup operations necessary before exiting. + +Fx is primarily intended for long-running server applications; +these applications typically receive a signal from the deployment system +when it's time to shut down. + +## Add an HTTP server + +In the previous section, we wrote a minimal Fx application +that doesn't do anything. +Let's add an HTTP server to it. + +1. Write a function to build your HTTP server. + + ```go mdox-exec="region 02-http-server/main.go partial" + // NewHTTPServer builds an HTTP server that will begin serving requests + // when the Fx application starts. + func NewHTTPServer(lc fx.Lifecycle) *http.Server { + srv := &http.Server{Addr: ":8080"} + return srv + } + ``` + + This isn't enough, though--we need to tell Fx how to start the HTTP server. + That's what the additional `fx.Lifecycle` argument is for. + +2. Add a *lifecycle hook* to the application with the `fx.Lifecycle` object. + This tells Fx how to start and stop the HTTP server. + + ```go mdox-exec="region 02-http-server/main.go full" + func NewHTTPServer(lc fx.Lifecycle) *http.Server { + srv := &http.Server{Addr: ":8080"} + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + fmt.Println("Starting HTTP server at", srv.Addr) + go srv.Serve(ln) + return nil + }, + OnStop: func(ctx context.Context) error { + return srv.Shutdown(ctx) + }, + }) + return srv + } + ``` + +3. Provide this to your Fx application above with `fx.Provide`. + + ```go mdox-exec="region 02-http-server/main.go provide-server" + func main() { + fx.New( + fx.Provide(NewHTTPServer), + ).Run() + } + ``` + +4. Run the application. + + ``` + [Fx] PROVIDE *http.Server <= main.NewHTTPServer() + [Fx] PROVIDE fx.Lifecycle <= go.uber.org/fx.New.func1() + [Fx] PROVIDE fx.Shutdowner <= go.uber.org/fx.(*App).shutdowner-fm() + [Fx] PROVIDE fx.DotGraph <= go.uber.org/fx.(*App).dotGraph-fm() + [Fx] RUNNING + ``` + + Huh? Did something go wrong? + The first line in the output states that the server was provided, + but it doesn't include our "Starting HTTP server" message. + The server didn't run. + +5. To fix that, add an `fx.Invoke` that requests the constructed server. + + ```go mdox-exec="region 02-http-server/main.go app" + fx.New( + fx.Provide(NewHTTPServer), + fx.Invoke(func(*http.Server) {}), + ).Run() + ``` + +6. Run the application again. + This time we should see "Starting HTTP server" in the output. + + ``` + [Fx] PROVIDE *http.Server <= main.NewHTTPServer() + [Fx] PROVIDE fx.Lifecycle <= go.uber.org/fx.New.func1() + [Fx] PROVIDE fx.Shutdowner <= go.uber.org/fx.(*App).shutdowner-fm() + [Fx] PROVIDE fx.DotGraph <= go.uber.org/fx.(*App).dotGraph-fm() + [Fx] INVOKE main.main.func1() + [Fx] HOOK OnStart main.NewHTTPServer.func1() executing (caller: main.NewHTTPServer) + Starting HTTP server at :8080 + [Fx] HOOK OnStart main.NewHTTPServer.func1() called by main.NewHTTPServer ran successfully in 7.958µs + [Fx] RUNNING + ``` + +7. Send a request to the running server. + + ```shell + $ curl http://localhost:8080 + 404 page not found + ``` + + The request is a 404 because the server doesn't know how to handle it yet. + We'll fix that in the next section. + +8. Stop the application. + + ``` + ^C + [Fx] INTERRUPT + [Fx] HOOK OnStop main.NewHTTPServer.func2() executing (caller: main.NewHTTPServer) + [Fx] HOOK OnStop main.NewHTTPServer.func2() called by main.NewHTTPServer ran successfully in 129.875µs + ``` + +**What did we just do?** + +We used `fx.Provide` to add an HTTP server to the application. +The server hooks into the Fx application lifecycle--it will +start serving requests when we call `App.Run`, +and it will stop running when the application receives a stop signal. +We used `fx.Invoke` to request that the HTTP server is always instantiated, +even if none of the other components in the application reference it directly. + + + +## Register a handler + +We built a server that can receive requests, +but it doesn't yet know how to handle them. +Let's fix that. + +1. Define a basic HTTP handler that copies the incoming request body + to the response. + Add the following to the bottom of your file. + + ```go mdox-exec="region 03-echo-handler/main.go echo-handler" + // EchoHandler is an http.Handler that copies its request body + // back to the response. + type EchoHandler struct{} + + // NewEchoHandler builds a new EchoHandler. + func NewEchoHandler() *EchoHandler { + return &EchoHandler{} + } + + // ServeHTTP handles an HTTP request to the /echo endpoint. + func (*EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + fmt.Fprintln(os.Stderr, "Failed to handle request:", err) + } + } + ``` + + Provide this to the application. + + ```go mdox-exec="region 03-echo-handler/main.go provide-handler" + fx.Provide( + NewHTTPServer, + NewEchoHandler, + ), + fx.Invoke(func(*http.Server) {}), + ``` + +2. Next, add a function that builds a `*http.ServeMux` + to route requests to this handler. + The new function will accept the `*EchoHandler` as an argument. + + ```go mdox-exec="region 03-echo-handler/main.go serve-mux" + // NewServeMux builds a ServeMux that will route requests + // to the given EchoHandler. + func NewServeMux(echo *EchoHandler) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle("/echo", echo) + return mux + } + ``` + + Likewise, provide this to the application. + + ```go mdox-exec="region 03-echo-handler/main.go provides" + fx.Provide( + NewHTTPServer, + NewServeMux, + NewEchoHandler, + ), + ``` + + Note that `NewServeMux` was added above `NewEchoHandler`--the order + in which constructors are given to `fx.Provide` does not matter. + +3. Lastly, modify the `NewHTTPServer` function to connect + the server to this `*ServeMux`. + + ```go mdox-exec="region 03-echo-handler/main.go connect-mux" + func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + ``` + +4. Run the server. + + ``` + [Fx] PROVIDE *http.Server <= main.NewHTTPServer() + [Fx] PROVIDE *http.ServeMux <= main.NewServeMux() + [Fx] PROVIDE *main.EchoHandler <= main.NewEchoHandler() + [Fx] PROVIDE fx.Lifecycle <= go.uber.org/fx.New.func1() + [Fx] PROVIDE fx.Shutdowner <= go.uber.org/fx.(*App).shutdowner-fm() + [Fx] PROVIDE fx.DotGraph <= go.uber.org/fx.(*App).dotGraph-fm() + [Fx] INVOKE main.main.func1() + [Fx] HOOK OnStart main.NewHTTPServer.func1() executing (caller: main.NewHTTPServer) + Starting HTTP server at :8080 + [Fx] HOOK OnStart main.NewHTTPServer.func1() called by main.NewHTTPServer ran successfully in 7.459µs + [Fx] RUNNING + ``` + +5. Send a request to the server. + + ```shell + $ curl -X POST -d 'hello' http://localhost:8080/echo + hello + ``` + +**What did we just do?** + +We added more components with `fx.Provide`. +These components declared dependencies on each other +by adding parameters to their constructors. +Fx will resolve component dependencies by parameters and return values +of the provided functions. + +## Add a logger + +Our application currently prints +the "Starting HTTP server" message to standard out, +and errors to standard error. +Both, standard out and error are also a form of global state. +We should print to a logger object. + +We'll use [Zap](https://pkg.go.dev/go.uber.org/zap) in this section of the tutorial +but you should be able to use any logging system. + +1. Provide a Zap logger to the application. + In this tutorial, we'll use [`zap.NewExample`](https://pkg.go.dev/go.uber.org/zap#NewExample), + but for real applications, you should use `zap.NewProduction` + or build a more customized logger. + + ```go mdox-exec="region 04-logger/main.go provides" + fx.Provide( + NewHTTPServer, + NewServeMux, + NewEchoHandler, + zap.NewExample, + ), + ``` + +2. Add a field to hold the logger on `EchoHandler`, + and in `NewEchoHandler` add a new logger argument to set this field. + + ```go mdox-exec="region 04-logger/main.go echo-init" + type EchoHandler struct { + log *zap.Logger + } + + func NewEchoHandler(log *zap.Logger) *EchoHandler { + return &EchoHandler{log: log} + } + ``` + +3. In the `EchoHandler.ServeHTTP` method, + use the logger instead of printing to standard error. + + ```go mdox-exec="region 04-logger/main.go echo-serve" + func (h *EchoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if _, err := io.Copy(w, r.Body); err != nil { + h.log.Warn("Failed to handle request", zap.Error(err)) + } + } + ``` + +4. Similarly, update `NewHTTPServer` to expect a logger + and log the "Starting HTTP server" message to that. + + ```go mdox-exec="region 04-logger/main.go http-server" + func NewHTTPServer(lc fx.Lifecycle, mux *http.ServeMux, log *zap.Logger) *http.Server { + srv := &http.Server{Addr: ":8080", Handler: mux} + lc.Append(fx.Hook{ + OnStart: func(ctx context.Context) error { + ln, err := net.Listen("tcp", srv.Addr) + if err != nil { + return err + } + log.Info("Starting HTTP server", zap.String("addr", srv.Addr)) + go srv.Serve(ln) + ``` + +5. (**Optional**) You can use the same Zap logger for Fx's own logs as well. + + ```go mdox-exec="region 04-logger/main.go fx-logger" + func main() { + fx.New( + fx.WithLogger(func(log *zap.Logger) fxevent.Logger { + return &fxevent.ZapLogger{Logger: log} + }), + ``` + + This will replace the `[Fx]` messages with messages printed to the logger. + +6. Run the application. + + ``` + {"level":"info","msg":"provided","constructor":"main.NewHTTPServer()","type":"*http.Server"} + {"level":"info","msg":"provided","constructor":"main.NewServeMux()","type":"*http.ServeMux"} + {"level":"info","msg":"provided","constructor":"main.NewEchoHandler()","type":"*main.EchoHandler"} + {"level":"info","msg":"provided","constructor":"go.uber.org/zap.NewExample()","type":"*zap.Logger"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.New.func1()","type":"fx.Lifecycle"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).shutdowner-fm()","type":"fx.Shutdowner"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).dotGraph-fm()","type":"fx.DotGraph"} + {"level":"info","msg":"initialized custom fxevent.Logger","function":"main.main.func1()"} + {"level":"info","msg":"invoking","function":"main.main.func2()"} + {"level":"info","msg":"OnStart hook executing","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer"} + {"level":"info","msg":"Starting HTTP server","addr":":8080"} + {"level":"info","msg":"OnStart hook executed","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer","runtime":"6.292µs"} + {"level":"info","msg":"started"} + ``` + +7. Post a request to it. + + ```shell + $ curl -X POST -d 'hello' http://localhost:8080/echo + hello + ``` + +**What did we just do?** + +We added another component to the application with `fx.Provide`, +and injected that into other components that need to print messages. +To do that, we only had to add a new parameter to the constructors. + +In the optional step, +we told Fx that we'd like to provide a custom logger for Fx's own operations. +We used the existing `fxevent.ZapLogger` to build this custom logger from our +injected logger, so that all logs follow the same format. + +## Decouple registration + +`NewServeMux` above declares an explicit dependency on `EchoHandler`. +This is an unnecessarily tight coupling. +Does the `ServeMux` really need to know the *exact* handler implementation? +If we want to write tests for `ServeMux`, +we shouldn't have to construct an `EchoHandler`. + +Let's try to fix this. + +1. Define a `Route` type in your main.go. + This is an extension of `http.Handler` where the handler knows its + registration path. + + ```go mdox-exec="region 05-registration/main.go route" + // Route is an http.Handler that knows the mux pattern + // under which it will be registered. + type Route interface { + http.Handler + + // Pattern reports the path at which this is registered. + Pattern() string + } + ``` + +2. Modify `EchoHandler` to implement this interface. + + ```go mdox-exec="region 05-registration/main.go echo-pattern" + func (*EchoHandler) Pattern() string { + return "/echo" + } + ``` + +3. In `main()`, annotate the `NewEchoHandler` entry to state that the handler + should be provided as a Route. + + ```go mdox-exec="region 05-registration/main.go provides" + fx.Provide( + NewHTTPServer, + NewServeMux, + fx.Annotate( + NewEchoHandler, + fx.As(new(Route)), + ), + zap.NewExample, + ), + ``` + +4. Modify `NewServeMux` to accept a Route and use its provided pattern. + + ```go mdox-exec="region 05-registration/main.go mux" + // NewServeMux builds a ServeMux that will route requests + // to the given Route. + func NewServeMux(route Route) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle(route.Pattern(), route) + return mux + } + ``` + +5. Run the service. + + ``` + {"level":"info","msg":"provided","constructor":"main.NewHTTPServer()","type":"*http.Server"} + {"level":"info","msg":"provided","constructor":"main.NewServeMux()","type":"*http.ServeMux"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewEchoHandler(), fx.As([[main.Route]])","type":"main.Route"} + {"level":"info","msg":"provided","constructor":"go.uber.org/zap.NewExample()","type":"*zap.Logger"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.New.func1()","type":"fx.Lifecycle"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).shutdowner-fm()","type":"fx.Shutdowner"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).dotGraph-fm()","type":"fx.DotGraph"} + {"level":"info","msg":"initialized custom fxevent.Logger","function":"main.main.func1()"} + {"level":"info","msg":"invoking","function":"main.main.func2()"} + {"level":"info","msg":"OnStart hook executing","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer"} + {"level":"info","msg":"Starting HTTP server","addr":":8080"} + {"level":"info","msg":"OnStart hook executed","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer","runtime":"10.125µs"} + {"level":"info","msg":"started"} + ``` + +6. Send a request to it. + + ```shell + $ curl -X POST -d 'hello' http://localhost:8080/echo + hello + ``` + +**What did we just do?** + +We introduced an interface to decouple the implementation +from the consumer. +We then annotated a previously provided constructor +with `fx.Annotate` and `fx.As` to cast its result to that interface. +This way, `NewEchoHandler` was able to continue returning an `*EchoHandler`. + +## Register another handler + +The handler we defined above has a single handler. +Let's add another. + +1. Build a new handler in the same file. + + ```go mdox-exec="region 06-another-handler/main.go hello-init" + // HelloHandler is an HTTP handler that + // prints a greeting to the user. + type HelloHandler struct { + log *zap.Logger + } + + // NewHelloHandler builds a new HelloHandler. + func NewHelloHandler(log *zap.Logger) *HelloHandler { + return &HelloHandler{log: log} + } + ``` + +2. Implement the `Route` interface for this handler. + + ```go mdox-exec="region 06-another-handler/main.go hello-methods" + func (*HelloHandler) Pattern() string { + return "/hello" + } + + func (h *HelloHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + body, err := io.ReadAll(r.Body) + if err != nil { + h.log.Error("Failed to read request", zap.Error(err)) + http.Error(w, "Internal server error", http.StatusInternalServerError) + return + } + + if _, err := fmt.Fprintf(w, "Hello, %s\n", body); err != nil { + h.log.Error("Failed to write response", zap.Error(err)) + http.Error(w, "Internal server error", http.StatusInternalServerError) + return + } + } + ``` + + The handler reads its request body, + and writes a welcome message back to the caller. + +3. Provide this to the application as a `Route` next to `NewEchoHandler`. + + ```go mdox-exec="region 06-another-handler/main.go hello-provide-partial" + fx.Annotate( + NewEchoHandler, + fx.As(new(Route)), + ), + fx.Annotate( + NewHelloHandler, + fx.As(new(Route)), + ), + ``` + +4. Run the application--the service will fail to start. + + ``` + [Fx] PROVIDE *http.Server <= main.NewHTTPServer() + [Fx] PROVIDE *http.ServeMux <= main.NewServeMux() + [Fx] PROVIDE main.Route <= fx.Annotate(main.NewEchoHandler(), fx.As([[main.Route]]) + [Fx] Error after options were applied: fx.Provide(fx.Annotate(main.NewHelloHandler(), fx.As([[main.Route]])) from: + [...] + [Fx] ERROR Failed to start: the following errors occurred: + - fx.Provide(fx.Annotate(main.NewHelloHandler(), fx.As([[main.Route]])) from: + [...] + Failed: cannot provide function "main".NewHelloHandler ([..]/main.go:53): cannot provide main.Route from [0].Field0: already provided by "main".NewEchoHandler ([..]/main.go:80) + ``` + + That's a lot of output, but inside the error message, we see: + + ``` + cannot provide main.Route from [0].Field0: already provided by "main".NewEchoHandler ([..]/main.go:80) + ``` + + This fails because Fx does not allow two instances of the same type + to be present in the container without annotating them. + `NewServeMux` does not know which `Route` to use. Let's fix this. + +5. Annotate `NewEchoHandler` and `NewHelloHandler` in `main()` with names for + both handlers. + + ```go mdox-exec="region 06-another-handler/main.go route-provides" + fx.Annotate( + NewEchoHandler, + fx.As(new(Route)), + fx.ResultTags(`name:"echo"`), + ), + fx.Annotate( + NewHelloHandler, + fx.As(new(Route)), + fx.ResultTags(`name:"hello"`), + ), + ``` + +6. Add another Route parameter to `NewServeMux`. + + ```go mdox-exec="region 06-another-handler/main.go mux" + // NewServeMux builds a ServeMux that will route requests + // to the given routes. + func NewServeMux(route1, route2 Route) *http.ServeMux { + mux := http.NewServeMux() + mux.Handle(route1.Pattern(), route1) + mux.Handle(route2.Pattern(), route2) + return mux + } + ``` + +7. Annotate `NewServeMux` in `main()` to pick these two *names values*. + + ```go mdox-exec="region 06-another-handler/main.go mux-provide" + fx.Provide( + NewHTTPServer, + fx.Annotate( + NewServeMux, + fx.ParamTags(`name:"echo"`, `name:"hello"`), + ), + ``` + +8. Run the program. + + ``` + {"level":"info","msg":"provided","constructor":"main.NewHTTPServer()","type":"*http.Server"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewServeMux(), fx.ParamTags([\"name:\\\"echo\\\"\" \"name:\\\"hello\\\"\"])","type":"*http.ServeMux"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewEchoHandler(), fx.ResultTags([\"name:\\\"echo\\\"\"]), fx.As([[main.Route]])","type":"main.Route[name = \"echo\"]"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewHelloHandler(), fx.ResultTags([\"name:\\\"hello\\\"\"]), fx.As([[main.Route]])","type":"main.Route[name = \"hello\"]"} + {"level":"info","msg":"provided","constructor":"go.uber.org/zap.NewExample()","type":"*zap.Logger"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.New.func1()","type":"fx.Lifecycle"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).shutdowner-fm()","type":"fx.Shutdowner"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).dotGraph-fm()","type":"fx.DotGraph"} + {"level":"info","msg":"initialized custom fxevent.Logger","function":"main.main.func1()"} + {"level":"info","msg":"invoking","function":"main.main.func2()"} + {"level":"info","msg":"OnStart hook executing","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer"} + {"level":"info","msg":"Starting HTTP server","addr":":8080"} + {"level":"info","msg":"OnStart hook executed","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer","runtime":"56.334µs"} + {"level":"info","msg":"started"} + ``` + +9. Send requests to it. + + ``` + $ curl -X POST -d 'hello' http://localhost:8080/echo + hello + + $ curl -X POST -d 'gopher' http://localhost:8080/hello + Hello, gopher + ``` + +**What did we just do?** + +We added a constructor that produces a value +with the same type as an existing type. +We annotated constructors with `fx.ResultTags` to produce *named values*, +and the consumer with `fx.ParamTags` to consume these named values. + +## Register many handlers + +We added two handlers in the previous section, +but we reference them both explicitly by name when we build `NewServeMux`. +This will quickly become inconvenient if we add more handlers. + +It's preferable if `NewServeMux` doesn't know how many handlers or their names, +and instead just accepts a list of handlers to register. + +Let's do that. + +1. Modify `NewServeMux` to operate on a list of `Route` objects. + + ```go mdox-exec="region 07-many-handlers/main.go mux" + func NewServeMux(routes []Route) *http.ServeMux { + mux := http.NewServeMux() + for _, route := range routes { + mux.Handle(route.Pattern(), route) + } + return mux + } + ``` + +2. Annotate the `NewServeMux` entry in `main` to say + that it accepts a slice that contains the contents of the "routes" group. + + ```go mdox-exec="region 07-many-handlers/main.go mux-provide" + fx.Provide( + NewHTTPServer, + fx.Annotate( + NewServeMux, + fx.ParamTags(`group:"routes"`), + ), + ``` + +3. Define a new function `AsRoute` to build functions that feed into this + group. + + ```go mdox-exec="region 07-many-handlers/main.go AsRoute" + // AsRoute annotates the given constructor to state that + // it provides a route to the "routes" group. + func AsRoute(f any) any { + return fx.Annotate( + f, + fx.As(new(Route)), + fx.ResultTags(`group:"routes"`), + ) + } + ``` + +4. Wrap the `NewEchoHandler` and `NewHelloHandler` constructors in `main()` + with `AsRoute` so that they feed their routes into this group. + + ```go mdox-exec="region 07-many-handlers/main.go route-provides" + fx.Provide( + AsRoute(NewEchoHandler), + AsRoute(NewHelloHandler), + zap.NewExample, + ), + ``` + +5. Finally, run the application. + + ``` + {"level":"info","msg":"provided","constructor":"main.NewHTTPServer()","type":"*http.Server"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewServeMux(), fx.ParamTags([\"group:\\\"routes\\\"\"])","type":"*http.ServeMux"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewEchoHandler(), fx.ResultTags([\"group:\\\"routes\\\"\"]), fx.As([[main.Route]])","type":"main.Route[group = \"routes\"]"} + {"level":"info","msg":"provided","constructor":"fx.Annotate(main.NewHelloHandler(), fx.ResultTags([\"group:\\\"routes\\\"\"]), fx.As([[main.Route]])","type":"main.Route[group = \"routes\"]"} + {"level":"info","msg":"provided","constructor":"go.uber.org/zap.NewExample()","type":"*zap.Logger"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.New.func1()","type":"fx.Lifecycle"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).shutdowner-fm()","type":"fx.Shutdowner"} + {"level":"info","msg":"provided","constructor":"go.uber.org/fx.(*App).dotGraph-fm()","type":"fx.DotGraph"} + {"level":"info","msg":"initialized custom fxevent.Logger","function":"main.main.func1()"} + {"level":"info","msg":"invoking","function":"main.main.func2()"} + {"level":"info","msg":"OnStart hook executing","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer"} + {"level":"info","msg":"Starting HTTP server","addr":":8080"} + {"level":"info","msg":"OnStart hook executed","callee":"main.NewHTTPServer.func1()","caller":"main.NewHTTPServer","runtime":"5µs"} + {"level":"info","msg":"started"} + ``` + +6. Send requests to it. + + ``` + $ curl -X POST -d 'hello' http://localhost:8080/echo + hello + + $ curl -X POST -d 'gopher' http://localhost:8080/hello + Hello, gopher + ``` + +**What did we just do?** + +We annotated `NewServeMux` to consume a *value group* as a slice, +and we annotated our existing handler constructors to feed into this value +group. +Any other constructor in the application can also feed values +into this value group as long as the result conforms to the `Route` interface. +They will all be collected together and passed into our `ServeMux` constructor. + + + +## Conclusion + +This marks the end of this tutorial. +In this tutorial, we covered, + +- [X] how to start an Fx application from scratch +- [X] how to inject new dependencies and modify existing ones +- [X] how to use interfaces to decouple components +- [X] how to use named values +- [X] how to use value groups diff --git a/docs/go.mod b/docs/go.mod new file mode 100644 index 000000000..ffc01da1b --- /dev/null +++ b/docs/go.mod @@ -0,0 +1,18 @@ +module go.uber.org/fx/docs + +go 1.19 + +require ( + go.uber.org/fx v1.18.2 + go.uber.org/zap v1.16.0 +) + +require ( + github.com/stretchr/testify v1.8.0 // indirect + go.uber.org/atomic v1.6.0 // indirect + go.uber.org/dig v1.15.0 // indirect + go.uber.org/multierr v1.5.0 // indirect + golang.org/x/sys v0.0.0-20210903071746-97244b99971b // indirect +) + +replace go.uber.org/fx => ../ diff --git a/docs/go.sum b/docs/go.sum new file mode 100644 index 000000000..1d39beb00 --- /dev/null +++ b/docs/go.sum @@ -0,0 +1,64 @@ +github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/benbjohnson/clock v1.3.0 h1:ip6w0uFQkncKQ979AypyG0ER7mqUSBdKLOgAle/AT8A= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 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h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= From 873d4559e46a686447d26ce5606cbd33bff9d1c8 Mon Sep 17 00:00:00 2001 From: Abhinav Gupta Date: Tue, 11 Oct 2022 06:37:46 -0700 Subject: [PATCH 3/5] README: Reword introduction, link to tutorial This rewords the introduction in the readme to better state the benefits of using Fx, and links to the get-started tutorial to help users get started. Part of this is to add the root README to the list of files processed by mdox, as a result of which some of the links are also rewritten. (mdox prefers inline links, not reference style links, and there's no way to change that right now.) --- README.md | 33 +++++++++++++++------------------ docs/Makefile | 2 +- 2 files changed, 16 insertions(+), 19 deletions(-) diff --git a/README.md b/README.md index f81122cee..56da0d5b3 100644 --- a/README.md +++ b/README.md @@ -1,35 +1,32 @@ -# :unicorn: Fx [![GoDoc][doc-img]][doc] [![Github release][release-img]][release] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov] [![Go Report Card](https://goreportcard.com/badge/go.uber.org/fx)](https://goreportcard.com/report/go.uber.org/fx) +# :unicorn: Fx [![GoDoc](https://pkg.go.dev/badge/go.uber.org/fx)](https://pkg.go.dev/go.uber.org/fx) [![Github release](https://img.shields.io/github/release/uber-go/fx.svg)](https://github.com/uber-go/fx/releases) [![Build Status](https://github.com/uber-go/fx/actions/workflows/go.yml/badge.svg)](https://github.com/uber-go/fx/actions/workflows/go.yml) [![Coverage Status](https://codecov.io/gh/uber-go/fx/branch/master/graph/badge.svg)](https://codecov.io/gh/uber-go/fx/branch/master) [![Go Report Card](https://goreportcard.com/badge/go.uber.org/fx)](https://goreportcard.com/report/go.uber.org/fx) -An application framework for Go that: +Fx is a dependency injection system for Go. -- Makes dependency injection easy. -- Eliminates the need for global state and `func init()`. +**Benefits** + +- Eliminate globals: Fx helps you remove global state from your application. + No more `init()` or global variables. Use Fx-managed singletons. +- Code reuse: Fx lets teams within your organization build loosely-coupled + and well-integrated shareable components. +- Battle tested: Fx is the backbone of nearly all Go services at Uber. ## Installation -We recommend locking to [SemVer](http://semver.org/) range `^1` using [go mod](https://github.com/golang/go/wiki/Modules): +Use Go modules to install Fx in your application. ```shell go get go.uber.org/fx@v1 ``` +## Getting started + +To get started with Fx, [start here](docs/get-started/README.md). + ## Stability This library is `v1` and follows [SemVer](http://semver.org/) strictly. No breaking changes will be made to exported APIs before `v2.0.0`. -This project follows the [Go Release Policy][release-policy]. Each major +This project follows the [Go Release Policy](https://golang.org/doc/devel/release.html#policy). Each major version of Go is supported until there are two newer major releases. - -[doc-img]: https://pkg.go.dev/badge/go.uber.org/fx -[doc]: https://pkg.go.dev/go.uber.org/fx -[release-img]: https://img.shields.io/github/release/uber-go/fx.svg -[release]: https://github.com/uber-go/fx/releases -[ci-img]: https://github.com/uber-go/fx/actions/workflows/go.yml/badge.svg -[ci]: https://github.com/uber-go/fx/actions/workflows/go.yml -[cov-img]: https://codecov.io/gh/uber-go/fx/branch/master/graph/badge.svg -[cov]: https://codecov.io/gh/uber-go/fx/branch/master -[report-card-img]: https://goreportcard.com/badge/github.com/uber-go/fx -[report-card]: https://goreportcard.com/report/github.com/uber-go/fx -[release-policy]: https://golang.org/doc/devel/release.html#policy diff --git a/docs/Makefile b/docs/Makefile index de1d7eb26..626bd18cf 100644 --- a/docs/Makefile +++ b/docs/Makefile @@ -2,7 +2,7 @@ export PATH := $(shell pwd)/bin:$(PATH) MDOX = $(shell pwd)/../bin/mdox MDOX_FMT_FLAGS = --soft-wraps --links.validate -MD_FILES = $(shell find . -name '*.md') +MD_FILES = $(shell find . -name '*.md') ../README.md .PHONY: fmt: $(MDOX) From 776a0d01d8cd61ba9e13745860caa9c9dab696dd Mon Sep 17 00:00:00 2001 From: Abhinav Gupta Date: Sat, 8 Oct 2022 13:01:07 -0500 Subject: [PATCH 4/5] docs: Test all get-started samples This adds tests for all get-started code samples. Since can't get coverage for these tests because they rely on os/exec to create subprocesses, also exclude these tests from codecov's coverage tracking. --- .codecov.yml | 2 + .github/workflows/go.yml | 4 + Makefile | 6 +- docs/get-started/01-minimal/main_test.go | 31 ++++ docs/get-started/02-http-server/main_test.go | 40 +++++ docs/get-started/03-echo-handler/main_test.go | 36 +++++ docs/get-started/04-logger/main_test.go | 36 +++++ docs/get-started/05-registration/main_test.go | 36 +++++ .../06-another-handler/main_test.go | 43 +++++ .../get-started/07-many-handlers/main_test.go | 43 +++++ docs/go.mod | 5 +- docs/go.sum | 3 + docs/internal/apptest/run.go | 153 ++++++++++++++++++ docs/internal/apptest/run_test.go | 96 +++++++++++ docs/internal/exectest/cmd.go | 66 ++++++++ docs/internal/exectest/cmd_test.go | 61 +++++++ docs/internal/exectest/output.go | 57 +++++++ docs/internal/exectest/output_test.go | 69 ++++++++ docs/internal/httptest/http.go | 49 ++++++ docs/internal/httptest/http_test.go | 59 +++++++ docs/internal/iotest/read.go | 38 +++++ docs/internal/iotest/read_test.go | 58 +++++++ docs/internal/test/fake.go | 87 ++++++++++ docs/internal/test/fake_test.go | 53 ++++++ docs/internal/test/t.go | 31 ++++ docs/internal/test/t_test.go | 25 +++ 26 files changed, 1185 insertions(+), 2 deletions(-) create mode 100644 docs/get-started/01-minimal/main_test.go create mode 100644 docs/get-started/02-http-server/main_test.go create mode 100644 docs/get-started/03-echo-handler/main_test.go create mode 100644 docs/get-started/04-logger/main_test.go create mode 100644 docs/get-started/05-registration/main_test.go create mode 100644 docs/get-started/06-another-handler/main_test.go create mode 100644 docs/get-started/07-many-handlers/main_test.go create mode 100644 docs/internal/apptest/run.go create mode 100644 docs/internal/apptest/run_test.go create mode 100644 docs/internal/exectest/cmd.go create mode 100644 docs/internal/exectest/cmd_test.go create mode 100644 docs/internal/exectest/output.go create mode 100644 docs/internal/exectest/output_test.go create mode 100644 docs/internal/httptest/http.go create mode 100644 docs/internal/httptest/http_test.go create mode 100644 docs/internal/iotest/read.go create mode 100644 docs/internal/iotest/read_test.go create mode 100644 docs/internal/test/fake.go create mode 100644 docs/internal/test/fake_test.go create mode 100644 docs/internal/test/t.go create mode 100644 docs/internal/test/t_test.go diff --git a/.codecov.yml b/.codecov.yml index 2e90589d0..2912cc672 100644 --- a/.codecov.yml +++ b/.codecov.yml @@ -1,3 +1,5 @@ +ignore: + - "docs/get-started/*/main.go" coverage: range: 80..100 diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml index e9b2cf37d..0890f810b 100644 --- a/.github/workflows/go.yml +++ b/.github/workflows/go.yml @@ -47,5 +47,9 @@ jobs: - name: Test run: make cover + - name: Test documentation + run: make cover COVER_MODULES=./docs + if: matrix.latest + - name: Upload coverage to codecov.io uses: codecov/codecov-action@v1 diff --git a/Makefile b/Makefile index 4f28539ac..4ad46d095 100644 --- a/Makefile +++ b/Makefile @@ -11,6 +11,10 @@ GO_FILES = $(shell \ MODULES = . ./tools ./docs +# 'make cover' should not run on docs by default. +# We run that separately explicitly on a specific platform. +COVER_MODULES ?= $(filter-out ./docs,$(MODULES)) + .PHONY: build build: go build ./... @@ -25,7 +29,7 @@ test: .PHONY: cover cover: - @$(foreach dir,$(MODULES), \ + @$(foreach dir,$(COVER_MODULES), \ (cd $(dir) && \ echo "[cover] $(dir)" && \ go test -race -coverprofile=cover.out -coverpkg=./... ./... && \ diff --git a/docs/get-started/01-minimal/main_test.go b/docs/get-started/01-minimal/main_test.go new file mode 100644 index 000000000..b8c72b2f9 --- /dev/null +++ b/docs/get-started/01-minimal/main_test.go @@ -0,0 +1,31 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "testing" + + "go.uber.org/fx/docs/internal/apptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) +} diff --git a/docs/get-started/02-http-server/main_test.go b/docs/get-started/02-http-server/main_test.go new file mode 100644 index 000000000..668f3ba6a --- /dev/null +++ b/docs/get-started/02-http-server/main_test.go @@ -0,0 +1,40 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "net/http" + "testing" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + "go.uber.org/fx/docs/internal/apptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) + + res, err := http.Get("http://127.0.0.1:8080/hello") + require.NoError(t, err) + defer res.Body.Close() + + assert.Equal(t, http.StatusNotFound, res.StatusCode) +} diff --git a/docs/get-started/03-echo-handler/main_test.go b/docs/get-started/03-echo-handler/main_test.go new file mode 100644 index 000000000..323863122 --- /dev/null +++ b/docs/get-started/03-echo-handler/main_test.go @@ -0,0 +1,36 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "testing" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/apptest" + "go.uber.org/fx/docs/internal/httptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) + + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/echo", "great success") + assert.Equal(t, "great success", got) +} diff --git a/docs/get-started/04-logger/main_test.go b/docs/get-started/04-logger/main_test.go new file mode 100644 index 000000000..323863122 --- /dev/null +++ b/docs/get-started/04-logger/main_test.go @@ -0,0 +1,36 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "testing" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/apptest" + "go.uber.org/fx/docs/internal/httptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) + + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/echo", "great success") + assert.Equal(t, "great success", got) +} diff --git a/docs/get-started/05-registration/main_test.go b/docs/get-started/05-registration/main_test.go new file mode 100644 index 000000000..323863122 --- /dev/null +++ b/docs/get-started/05-registration/main_test.go @@ -0,0 +1,36 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "testing" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/apptest" + "go.uber.org/fx/docs/internal/httptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) + + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/echo", "great success") + assert.Equal(t, "great success", got) +} diff --git a/docs/get-started/06-another-handler/main_test.go b/docs/get-started/06-another-handler/main_test.go new file mode 100644 index 000000000..d2866aaf7 --- /dev/null +++ b/docs/get-started/06-another-handler/main_test.go @@ -0,0 +1,43 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "testing" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/apptest" + "go.uber.org/fx/docs/internal/httptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) + + t.Run("echo", func(t *testing.T) { + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/echo", "great success") + assert.Equal(t, "great success", got) + }) + + t.Run("hello", func(t *testing.T) { + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/hello", "world") + assert.Equal(t, "Hello, world\n", got) + }) +} diff --git a/docs/get-started/07-many-handlers/main_test.go b/docs/get-started/07-many-handlers/main_test.go new file mode 100644 index 000000000..d2866aaf7 --- /dev/null +++ b/docs/get-started/07-many-handlers/main_test.go @@ -0,0 +1,43 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package main + +import ( + "testing" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/apptest" + "go.uber.org/fx/docs/internal/httptest" +) + +func TestRun(t *testing.T) { + apptest.Start(t, main) + + t.Run("echo", func(t *testing.T) { + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/echo", "great success") + assert.Equal(t, "great success", got) + }) + + t.Run("hello", func(t *testing.T) { + got := httptest.PostSuccess(t, "http://127.0.0.1:8080/hello", "world") + assert.Equal(t, "Hello, world\n", got) + }) +} diff --git a/docs/go.mod b/docs/go.mod index ffc01da1b..ec2ec5e0b 100644 --- a/docs/go.mod +++ b/docs/go.mod @@ -3,16 +3,19 @@ module go.uber.org/fx/docs go 1.19 require ( + github.com/stretchr/testify v1.8.0 go.uber.org/fx v1.18.2 go.uber.org/zap v1.16.0 ) require ( - github.com/stretchr/testify v1.8.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect go.uber.org/atomic v1.6.0 // indirect go.uber.org/dig v1.15.0 // indirect go.uber.org/multierr v1.5.0 // indirect golang.org/x/sys v0.0.0-20210903071746-97244b99971b // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect ) replace go.uber.org/fx => ../ diff --git a/docs/go.sum b/docs/go.sum index 1d39beb00..e665a2af3 100644 --- a/docs/go.sum +++ b/docs/go.sum @@ -6,8 +6,10 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI= github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck= +github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI= github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo= github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= +github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE= github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I= github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= @@ -53,6 +55,7 @@ golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5 h1:hKsoRgsbwY1NafxrwTs+k64 golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY= gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw= diff --git a/docs/internal/apptest/run.go b/docs/internal/apptest/run.go new file mode 100644 index 000000000..73fe7d4b4 --- /dev/null +++ b/docs/internal/apptest/run.go @@ -0,0 +1,153 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package apptest + +import ( + "bufio" + "context" + "encoding/json" + "os" + "strings" + "time" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/exectest" + "go.uber.org/fx/docs/internal/test" +) + +// StartOption is an option for the Start function. +type StartOption interface{ apply(*startOptions) } + +type startOptions struct { + IsRunning func(string) bool + Timeout time.Duration +} + +type isRunningOption func(string) bool + +// IsRunning customizes how Start determines +// whether a log statement represents a running application. +// +// Defaults to DefaultIsRunning. +func IsRunning(f func(string) bool) StartOption { + return isRunningOption(f) +} + +func (o isRunningOption) apply(opts *startOptions) { + opts.IsRunning = o +} + +// DefaultIsRunning looks for lines in Fx's log output, +// which match either the ConsoleLogger or the ZapLogger's +// output, +// and represent that the application is running +// and ready to receive requests. +func DefaultIsRunning(line string) bool { + // ConsoleLogger + if strings.Contains(line, "[Fx] RUNNING") { + return true + } + + // ZapLogger + var log struct { + Msg string `json:"msg"` + } + if err := json.Unmarshal([]byte(line), &log); err == nil { + return log.Msg == "started" + } + + return false +} + +type timeoutOption time.Duration + +// Timeout specifies the duration after which we'll +// stop waiting for the application to start up. +// +// Defaults to 5s. +func Timeout(t time.Duration) StartOption { + return timeoutOption(t) +} + +func (o timeoutOption) apply(opts *startOptions) { + opts.Timeout = time.Duration(o) +} + +// Start starts the Fx application that main represents, +// and blocks until isRunning(line) reports true for a line of output. +// When the test exits, this signals for the application to stop, +// and waits for it to stop. +func Start(t test.T, main func(), options ...StartOption) { + t.Helper() + + opts := startOptions{ + Timeout: 5 * time.Second, + IsRunning: DefaultIsRunning, + } + for _, o := range options { + o.apply(&opts) + } + + cmd := exectest.Command(t, main) + + r := exectest.StartWithOutput(t, cmd) + done := make(chan struct{}) + unblock := make(chan struct{}) + go func() { + defer close(done) + + var found bool + scan := bufio.NewScanner(r) + for scan.Scan() { + line := scan.Text() + t.Logf("%s", line) + if !found && opts.IsRunning(line) { + found = true + close(unblock) + } + } + assert.NoError(t, scan.Err(), "scan error") + }() + t.Cleanup(func() { + assert.NoError(t, cmd.Process.Signal(os.Interrupt), "send SIGINT") + <-done + }) + + ctx, cancel := context.WithTimeout(context.Background(), opts.Timeout) + defer cancel() + + select { + case <-unblock: + return + + case <-done: + // If the application exited without printing the Running + // message, something went wrong. + // Fail the test. + t.Errorf("application exited unexpectedly") + t.FailNow() + + case <-ctx.Done(): + // Application did not start within the specified timeout. + t.Errorf("application did not start in %v", opts.Timeout) + t.FailNow() + } +} diff --git a/docs/internal/apptest/run_test.go b/docs/internal/apptest/run_test.go new file mode 100644 index 000000000..154cb8c36 --- /dev/null +++ b/docs/internal/apptest/run_test.go @@ -0,0 +1,96 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package apptest + +import ( + "fmt" + "os" + "os/signal" + "testing" + "time" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + "go.uber.org/fx/docs/internal/test" +) + +func waitForInterrupt() { + ch := make(chan os.Signal, 1) + signal.Notify(ch, os.Interrupt) + <-ch +} + +func TestStart_FxLogger(t *testing.T) { + Start(t, func() { + fmt.Println("Not Fx output") + fmt.Println("[Fx] RUNNING") + waitForInterrupt() + fmt.Println("Interrupted") + }) + // If we get here, everything is okay. +} + +func TestStart_ZapLogger(t *testing.T) { + Start(t, func() { + fmt.Println("Not Fx output") + fmt.Println(`{"msg": "started"}`) + waitForInterrupt() + fmt.Println("Interrupted") + }) + // If we get here, everything is okay. +} + +func TestStart_Custom(t *testing.T) { + Start(t, func() { + fmt.Println("Not Fx output") + fmt.Println("Hello world") + waitForInterrupt() + fmt.Println("Interrupted") + }, IsRunning(func(s string) bool { + return s == "Hello world" + })) + // If we get here, everything is okay. +} + +func TestStart_UnexpectedExit(t *testing.T) { + result := test.WithFake(t, func(t test.T) { + Start(t, func() { + fmt.Println("Not what we want") + }) + }) + + assert.True(t, result.Fatally, "expected FailNow") + require.Len(t, result.Errors, 1, "expected an error message") + assert.Contains(t, result.Errors[0], "application exited unexpectedly") +} + +func TestStart_Timoeut(t *testing.T) { + result := test.WithFake(t, func(t test.T) { + Start(t, func() { + fmt.Println("Not what we want") + waitForInterrupt() + }, Timeout(time.Millisecond)) + }) + + assert.True(t, result.Fatally, "expected FailNow") + require.Len(t, result.Errors, 1, "expected an error message") + assert.Contains(t, result.Errors[0], "application did not start") +} diff --git a/docs/internal/exectest/cmd.go b/docs/internal/exectest/cmd.go new file mode 100644 index 000000000..c14a361aa --- /dev/null +++ b/docs/internal/exectest/cmd.go @@ -0,0 +1,66 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package exectest + +import ( + "os" + "os/exec" + "path/filepath" + + "github.com/stretchr/testify/require" + "go.uber.org/fx/docs/internal/test" +) + +// Command builds an exec.Cmd that will run the given function as an external +// executable. +// +// This operates by re-running the test executable to run only the current +// test, and hijacking that test execution to run the main function. +// +// cmd := MainCmd(t, func() { fmt.Println("hello") }) +// got, err := cmd.Output() +// ... +// fmt.Println(string(got) == "hello\n") // true +func Command(t test.T, main func()) *exec.Cmd { + t.Helper() + + // This messes up the hijacking sometimes. + // Keep it simple -- only top level tests can do this. + require.NotContains(t, t.Name(), "/", + "exectest.Command cannot be used with subtests") + + if filepath.Base(os.Args[0]) == t.Name() { + // We can't get coverage for this block + // because if the condition is true, + // we're inside the subprocess. + main() + os.Exit(0) + } + + exe, err := os.Executable() + require.NoError(t, err, "determine executable") + + cmd := exec.Command(exe, "-test.run", "^"+t.Name()+"$") + // Args[0] is the value of os.Args[0] for the new executable. + // os.Args[0] is allowed to be different from the command. + cmd.Args[0] = t.Name() + return cmd +} diff --git a/docs/internal/exectest/cmd_test.go b/docs/internal/exectest/cmd_test.go new file mode 100644 index 000000000..668761311 --- /dev/null +++ b/docs/internal/exectest/cmd_test.go @@ -0,0 +1,61 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package exectest + +import ( + "bytes" + "fmt" + "os" + "testing" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" +) + +func TestCommandSuccess(t *testing.T) { + cmd := Command(t, func() { + fmt.Println("hello world") + }) + + out, err := cmd.Output() + require.NoError(t, err) + assert.Equal(t, "hello world\n", string(out)) + + assert.True(t, cmd.ProcessState.Exited(), "must exit") + assert.Zero(t, cmd.ProcessState.ExitCode(), "exit code") +} + +func TestCommandNonZero(t *testing.T) { + cmd := Command(t, func() { + fmt.Fprintln(os.Stderr, "great sadness") + os.Exit(1) + }) + + var stderr bytes.Buffer + cmd.Stderr = &stderr + + err := cmd.Run() + require.Error(t, err, "command must fail") + + assert.Equal(t, "great sadness\n", stderr.String()) + assert.True(t, cmd.ProcessState.Exited(), "must exit") + assert.Equal(t, 1, cmd.ProcessState.ExitCode(), "exit code") +} diff --git a/docs/internal/exectest/output.go b/docs/internal/exectest/output.go new file mode 100644 index 000000000..938c7b2b3 --- /dev/null +++ b/docs/internal/exectest/output.go @@ -0,0 +1,57 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package exectest + +import ( + "io" + "os" + "os/exec" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + "go.uber.org/fx/docs/internal/test" +) + +// StartWithOutput starts the given command, +// and returns an io.Reader that reads from both, +// its stdout and stderr. +// +// At test end, the system will ensure that +// the command finished running. +func StartWithOutput(t test.T, cmd *exec.Cmd) io.Reader { + t.Helper() + + r, w, err := os.Pipe() + require.NoError(t, err, "create pipe") + + cmd.Stdout = w + cmd.Stderr = w + require.NoError(t, cmd.Start(), "start command") + // Close the output writer because this process won't write to it + // anymore. Only the spawned process will. + assert.NoError(t, w.Close(), "close output writer") + t.Cleanup(func() { + _, err := cmd.Process.Wait() + assert.NoError(t, err, "wait for end") + assert.NoError(t, r.Close(), "close output reader") + }) + return r +} diff --git a/docs/internal/exectest/output_test.go b/docs/internal/exectest/output_test.go new file mode 100644 index 000000000..413a0c7b4 --- /dev/null +++ b/docs/internal/exectest/output_test.go @@ -0,0 +1,69 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package exectest + +import ( + "fmt" + "io" + "os" + "testing" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" +) + +func TestStartOutputReader_Stdout(t *testing.T) { + cmd := Command(t, func() { + fmt.Println("hello") + fmt.Println("world") + }) + + r := StartWithOutput(t, cmd) + got, err := io.ReadAll(r) + require.NoError(t, err) + assert.Equal(t, "hello\nworld\n", string(got)) +} + +func TestStartOutputReader_Stderr(t *testing.T) { + cmd := Command(t, func() { + fmt.Fprintln(os.Stderr, "great") + fmt.Fprintln(os.Stderr, "sadness") + }) + + r := StartWithOutput(t, cmd) + got, err := io.ReadAll(r) + require.NoError(t, err) + assert.Equal(t, "great\nsadness\n", string(got)) +} + +func TestStartOutputReader_Combined(t *testing.T) { + cmd := Command(t, func() { + fmt.Println("foo") + fmt.Fprintln(os.Stderr, "bar") + fmt.Println("baz") + fmt.Fprintln(os.Stderr, "qux") + }) + + r := StartWithOutput(t, cmd) + got, err := io.ReadAll(r) + require.NoError(t, err) + assert.Equal(t, "foo\nbar\nbaz\nqux\n", string(got)) +} diff --git a/docs/internal/httptest/http.go b/docs/internal/httptest/http.go new file mode 100644 index 000000000..47751cea2 --- /dev/null +++ b/docs/internal/httptest/http.go @@ -0,0 +1,49 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package httptest + +import ( + "net/http" + "strings" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + "go.uber.org/fx/docs/internal/iotest" + "go.uber.org/fx/docs/internal/test" +) + +// PostSuccess makes an HTTP POST request to the given URL, +// and returns the response body. +// +// PostSuccess uses a text/plain content type, +// and expects a 200 status code. +func PostSuccess(t test.T, url, body string) string { + t.Helper() + + res, err := http.Post(url, "text/plain", strings.NewReader(body)) + require.NoError(t, err, "http post %q", url) + defer func() { + assert.NoError(t, res.Body.Close(), "close response body") + }() + assert.Equal(t, http.StatusOK, res.StatusCode, "status code did not match") + + return iotest.ReadAll(t, res.Body) +} diff --git a/docs/internal/httptest/http_test.go b/docs/internal/httptest/http_test.go new file mode 100644 index 000000000..18bedbcf9 --- /dev/null +++ b/docs/internal/httptest/http_test.go @@ -0,0 +1,59 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package httptest + +import ( + "io" + "net/http" + "net/http/httptest" + "testing" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/test" +) + +func TestPostSuccess(t *testing.T) { + mux := http.NewServeMux() + mux.HandleFunc("/success", func(w http.ResponseWriter, r *http.Request) { + _, err := io.Copy(w, r.Body) + assert.NoError(t, err, "copy request body") + }) + mux.HandleFunc("/failure", func(w http.ResponseWriter, r *http.Request) { + http.NotFound(w, r) + }) + + srv := httptest.NewServer(mux) + defer srv.Close() + + t.Run("success", func(t *testing.T) { + got := PostSuccess(t, srv.URL+"/success", "hello") + assert.Equal(t, "hello", got) + }) + + t.Run("failure", func(t *testing.T) { + result := test.WithFake(t, func(t test.T) { + PostSuccess(t, srv.URL+"/failure", "hello") + }) + assert.True(t, result.Failed, "test should fail") + assert.Len(t, result.Errors, 1) + assert.Contains(t, result.Errors[0], "status code did not match") + }) +} diff --git a/docs/internal/iotest/read.go b/docs/internal/iotest/read.go new file mode 100644 index 000000000..cdfa8d382 --- /dev/null +++ b/docs/internal/iotest/read.go @@ -0,0 +1,38 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package iotest + +import ( + "io" + + "github.com/stretchr/testify/require" + "go.uber.org/fx/docs/internal/test" +) + +// ReadAll is an alias for io.ReadAll that fails the current test +// and halts execution if the read fails. +func ReadAll(t test.T, r io.Reader) string { + t.Helper() + + b, err := io.ReadAll(r) + require.NoError(t, err, "read all output") + return string(b) +} diff --git a/docs/internal/iotest/read_test.go b/docs/internal/iotest/read_test.go new file mode 100644 index 000000000..36b7442e3 --- /dev/null +++ b/docs/internal/iotest/read_test.go @@ -0,0 +1,58 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package iotest + +import ( + "errors" + "strings" + "testing" + "testing/iotest" + + "github.com/stretchr/testify/assert" + "go.uber.org/fx/docs/internal/test" +) + +func TestReadAll(t *testing.T) { + t.Run("success", func(t *testing.T) { + got := ReadAll(t, strings.NewReader("hello")) + assert.Equal(t, "hello", got) + }) + + t.Run("failure", func(t *testing.T) { + newT := fakeT{T: t} + ReadAll(&newT, iotest.ErrReader(errors.New("great sadness"))) + assert.True(t, newT.failed, "test must have failed") + }) +} + +type fakeT struct { + test.T + + failed bool +} + +func (t *fakeT) Errorf(msg string, args ...any) { + t.failed = true +} + +func (t *fakeT) FailNow() { + t.failed = true +} diff --git a/docs/internal/test/fake.go b/docs/internal/test/fake.go new file mode 100644 index 000000000..3e785d858 --- /dev/null +++ b/docs/internal/test/fake.go @@ -0,0 +1,87 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package test + +import ( + "fmt" + "runtime" + "sync" +) + +// FakeReport is the result of an execution with a fake T. +type FakeReport struct { + Failed bool + Fatally bool + Errors []string +} + +// WithFake runs the given function with a fake T. +// Failures reported to the fake will not affect the current test. +// When the given function finishes running, +// WithFake produces a report of the test run. +func WithFake(t T, f func(T)) FakeReport { + fake := fakeT{T: t} + + // t.FailNow calls runtime.Goexit to kill the current goroutine. + // To guard against that, we'll run the given function + // in a separate goroutine and if the user calls t.FailNow, + // we'll record it and continue execution here. + done := make(chan struct{}) + go func() { + defer close(done) + f(&fake) + }() + <-done + + return FakeReport{ + Failed: fake.failed, + Fatally: fake.fatal, + Errors: fake.errors, + } +} + +// fakeT is a fake implementation of a T. +type fakeT struct { + T + mu sync.RWMutex + fatal bool + failed bool + errors []string +} + +var _ T = (*fakeT)(nil) + +func (t *fakeT) Errorf(msg string, args ...any) { + t.mu.Lock() + defer t.mu.Unlock() + + t.failed = true + t.errors = append(t.errors, fmt.Sprintf(msg, args...)) +} + +func (t *fakeT) FailNow() { + t.mu.Lock() + defer t.mu.Unlock() + + t.failed = true + t.fatal = true + runtime.Goexit() +} diff --git a/docs/internal/test/fake_test.go b/docs/internal/test/fake_test.go new file mode 100644 index 000000000..e8f8973f1 --- /dev/null +++ b/docs/internal/test/fake_test.go @@ -0,0 +1,53 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package test + +import ( + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestWithFake_Success(t *testing.T) { + report := WithFake(t, func(t T) { + t.Logf("success") + }) + assert.False(t, report.Failed) + assert.False(t, report.Fatally) + assert.Empty(t, report.Errors) +} + +func TestWithFake_Failure(t *testing.T) { + report := WithFake(t, func(t T) { + t.Errorf("great sadness") + }) + assert.True(t, report.Failed) + assert.False(t, report.Fatally) + assert.Equal(t, []string{"great sadness"}, report.Errors) +} + +func TestWithFake_Fatal(t *testing.T) { + report := WithFake(t, func(t T) { + t.FailNow() + }) + assert.True(t, report.Failed) + assert.True(t, report.Fatally) +} diff --git a/docs/internal/test/t.go b/docs/internal/test/t.go new file mode 100644 index 000000000..c9499532f --- /dev/null +++ b/docs/internal/test/t.go @@ -0,0 +1,31 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package test + +// T is an interface defining a subset of the *testing.T type's API. +type T interface { + Cleanup(func()) + Errorf(string, ...any) + FailNow() + Helper() + Logf(string, ...any) + Name() string +} diff --git a/docs/internal/test/t_test.go b/docs/internal/test/t_test.go new file mode 100644 index 000000000..9ce5f5258 --- /dev/null +++ b/docs/internal/test/t_test.go @@ -0,0 +1,25 @@ +// Copyright (c) 2022 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package test + +import "testing" + +var _ T = (*testing.T)(nil) From 88ba16b3e05379be1084157adebcc39d0294602a Mon Sep 17 00:00:00 2001 From: Abhinav Gupta Date: Tue, 11 Oct 2022 11:06:23 -0700 Subject: [PATCH 5/5] test/example: Fix flakiness The example test is flaky because `go ListenAndServe()` is not always ready to accept connections by the time we get to making the request. To fix this, start a listener explicitly in a blocking manner, and run the Serve goroutine separately. --- example_test.go | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/example_test.go b/example_test.go index 2ae72f25f..8206cb732 100644 --- a/example_test.go +++ b/example_test.go @@ -23,6 +23,7 @@ package fx_test import ( "context" "log" + "net" "net/http" "os" "time" @@ -145,9 +146,11 @@ func NewMux(lc fx.Lifecycle, logger *log.Logger) *http.ServeMux { // passed via Go's usual context.Context. OnStart: func(context.Context) error { logger.Print("Starting HTTP server.") - // In production, we'd want to separate the Listen and Serve phases for - // better error-handling. - go server.ListenAndServe() + ln, err := net.Listen("tcp", server.Addr) + if err != nil { + return err + } + go server.Serve(ln) return nil }, OnStop: func(ctx context.Context) error {