rework collector

this is a big refactor, essentially rewriting the custom collector from
scratch, and as such, creating a new dashboard based on the new metrics.

Signed-off-by: Ciro S. Costa <utxobr@protonmail.com>

.gitignore

@@ -0,0 +1 @@
+dist/

.goreleaser.yml

@@ -24,13 +24,6 @@ builds:
       - 6
       - 7
 
-archives:
-  - replacements:
-      darwin: Darwin
-      linux: Linux
-      windows: Windows
-      amd64: x86_64
-
 checksum:
   name_template: 'checksums.txt'
 

Dockerfile

@@ -0,0 +1,30 @@
+ARG BUILDER_IMAGE=golang@sha256:4544ae57fc735d7e415603d194d9fb09589b8ad7acd4d66e928eabfb1ed85ff1
+ARG RUNTIME_IMAGE=gcr.io/distroless/static@sha256:c9f9b040044cc23e1088772814532d90adadfa1b86dcba17d07cb567db18dc4e
+
+
+FROM $BUILDER_IMAGE as builder
+
+        WORKDIR /workspace
+
+        COPY .git     .git
+        COPY go.mod   go.mod
+        COPY go.sum   go.sum
+        COPY pkg/     pkg/
+        COPY cmd/     cmd/
+
+        RUN set -x && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on \
+                go build -a -v \
+			-ldflags "-s -w -X main.version=$(git tag) -X main.commit=$(git rev-parse HEAD)" \
+			-tags osusergo,netgo,static_build \
+			-trimpath \
+			-o monero-exporter \
+				./cmd/monero-exporter
+
+
+FROM $RUNTIME_IMAGE
+
+        WORKDIR /
+        COPY --from=builder /workspace/monero-exporter .
+        USER 65532:65532
+
+        ENTRYPOINT ["/monero-exporter"]

INSTALL.md

@@ -0,0 +1,118 @@
+# Install
+
+## Using Go
+
+If you already have [Go] installed, you can use to Go toolchain to build from
+source and install it for you (under `$GOPATH/bin`):
+
+```console
+$ GO111MODULE=on go get github.com/cirocosta/monero-exporter/cmd/monero-exporter
+go: downloading github.com/cirocosta/monero-exporter v0.0.3
+
+$ monero-exporter --help
+Prometheus exporter for monero metrics
+
+Usage:
+  monero-exporter [flags]
+...
+```
+
+Note that this will install the latest tagged release (not necessarily the
+latest code).
+
+
+## From releases
+
+In the [releases page] you'll find the pre-compiled releases for each platform.
+
+
+### "yeah yeah, I trust the interwebs" mode
+
+```bash
+export VERSION=0.0.3
+
+curl -SL -o- https://github.com/cirocosta/monero-exporter/releases/download/v$VERSION/monero-exporter_$VERSION_Linux_x86_64.tar.gz | \
+  tar xvzf monero
+mv ./monero-exporter /usr/local/bin
+```
+
+
+### "trust, but verify" mode
+
+
+1. fetch my public key and make sure it matches the expected fingerprint
+
+```console
+$ curl -SOL https://utxo.com.br/pgp/public-key.txt
+```
+
+now, using `gpg`, derive the fingerprint. it should match the one advertised by
+me: `9CD1 1313 8578 59CC 0FAD  E93B 6B93 177A 62D0 1DB8` (should be the same as
+you can find under my personal account on Twitter: http://twitter.com/cirowrc).
+
+
+```console
+$ gpg --keyid-format long --with-fingerprint ./public-key.txt
+pub   rsa3072/6B93177A62D01DB8 2021-07-19 [SC] [expires: 2023-07-19]
+      Key fingerprint = 9CD1 1313 8578 59CC 0FAD  E93B 6B93 177A 62D0 1DB8
+```
+
+then, import into the key to the keyring so it can be used to validate that I
+indeed signed the content advertised.
+
+```console
+$ gpg --import ./public-key.txt
+gpg: key 6B93177A62D01DB8: public key "..." imported
+gpg: Total number processed: 1
+gpg:               imported: 1
+```
+
+
+2. download the archive for your platform as well as the checksums
+
+```console
+$ curl -SOL https://github.com/cirocosta/monero-exporter/releases/download/v0.0.3/monero-exporter_0.0.3_Linux_x86_64.tar.gz
+$ curl -SOL https://github.com/cirocosta/monero-exporter/releases/download/v0.0.3/checksums.txt.asc
+```
+
+
+3. verify that you can trust the checksums (that it has been generated and
+   not tampered with), and then verify that the assets you downloaded are what
+   they supposed to be
+
+```console
+$ gpg --verify ./checksums.txt.asc
+gpg: Signature made Mon 19 Jul 2021 02:10:42 PM EDT
+gpg:                using RSA key 9CD11313857859CC0FADE93B6B93177A62D01DB8
+gpg: Good signature from "Ciro ...
+```
+
+
+4. verify that the tarball is what it should be
+
+compute the digest of the tarball
+
+```console
+$ sha256sum ./monero-exporter_0.0.3_Linux_x86_64.tar.gz
+e2b2214c9371fe3c0333cca7feff3554c56d8d0f377180e39ff50d332639c22d  ./monero-exporter_0.0.3_Linux_x86_64.tar.gz
+
+
+see that it matches what you found in the signed checksums file
+
+$ cat ./checksums.txt.asc | grep e2b2214c9371fe3c0333cca7feff3554c56d8d0f377180e39ff50d332639c22d
+e2b2214c9371fe3c0333cca7feff3554c56d8d0f377180e39ff50d332639c22d  monero-exporter_0.0.3_Linux_x86_64.tar.gz
+```
+
+5. install
+
+```console
+$ tar xvzf ./monero-exporter_0.0.3_Linux_x86_64.tar.gz monero
+$ mv monero /usr/local/bin
+
+$ monero-exporter version
+0.0.3 ...
+```
+
+
+[Go]: https://golang.org/dl/
+[releases page]: https://github.com/cirocosta/monero-exporter/releases

Makefile

@@ -1,8 +1,19 @@
 install:
 	go install -v ./cmd/monero-exporter
 
+run:
+	monero-exporter \
+		--monero-addr=http://localhost:18081 \
+		--bind-addr=:9000 \
+		--geoip-filepath=./hack/geoip.mmdb
+
 test:
 	go test ./...
 
 lint:
-	go run github.com/golangci/golangci-lint/cmd/golangci-lint run --config=.golangci.yaml
+	go run github.com/golangci/golangci-lint/cmd/golangci-lint run \
+		--config=.golangci.yaml
+
+
+table-of-contents:
+	doctoc --notitle ./README.md