From b3768028a7fb5257c6de8296c08c3f6afed595e8 Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Mon, 23 Aug 2021 15:56:25 +0200 Subject: [PATCH 1/8] Add version to trafficmirror --- .goreleaser.yml | 9 +++++++++ main.go | 7 +++++++ 2 files changed, 16 insertions(+) diff --git a/.goreleaser.yml b/.goreleaser.yml index 1853295..8669415 100644 --- a/.goreleaser.yml +++ b/.goreleaser.yml @@ -12,6 +12,10 @@ builds: - env: - CGO_ENABLED=0 - GO111MODULE=on + ldflags: + - -s -w -X github.com/rb3ckers/trafficmirror.Version={{.Version}} + - -X github.com/rb3ckers/trafficmirror.Commit={{.Commit}} + - -X github.com/rb3ckers/trafficmirror.Date={{.Date}} checksum: name_template: checksums.txt snapshot: @@ -29,6 +33,11 @@ dockers: - go.sum - main.go - rootfs/ + build_flag_templates: + - "--label=org.opencontainers.image.created={{.Date}}" + - "--label=org.opencontainers.image.title={{.ProjectName}}" + - "--label=org.opencontainers.image.revision={{.FullCommit}}" + - "--label=org.opencontainers.image.version={{.Version}}" image_templates: - docker.io/stackstate/trafficmirror:latest - docker.io/stackstate/trafficmirror:{{ .Tag }} diff --git a/main.go b/main.go index 71b45af..e2639d7 100644 --- a/main.go +++ b/main.go @@ -19,6 +19,12 @@ import ( "github.com/rb3ckers/trafficmirror/datatypes" ) +var ( + Version string + Commit string + Date string +) + var netClient = &http.Client{ Timeout: time.Second * 20, } @@ -49,6 +55,7 @@ func main() { return } + fmt.Printf("Traffic Mirror %s (Built on: %ss, Commit: %s)\n", Version, Date, Commit) fmt.Printf("Mirroring traffic from %s to %s\n", *listenAddress, *proxyTarget) var targetsText string if *targetsAddress != "" { From b88778fdc1f2e426b6a17882a9cc9a836b0c26dd Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Tue, 24 Aug 2021 12:22:54 +0200 Subject: [PATCH 2/8] Restructure code to modern standards - Use of spf13/cobra for command line parsing - Moved actual proxying code to own package - Added golangci config - Upgraded golang version to 1.16 Signed-off-by: Jeroen van Erp --- .golangci.yml | 76 ++++ cmd/root.go | 114 ++++++ datatypes/MirrorTargets.go | 42 ++- go.mod | 11 +- go.sum | 689 +++++++++++++++++++++++++++++++++++- internal/config/config.go | 28 ++ internal/proxy/basicauth.go | 32 ++ internal/proxy/proxy.go | 165 +++++++++ main.go | 225 +----------- 9 files changed, 1144 insertions(+), 238 deletions(-) create mode 100644 .golangci.yml create mode 100644 cmd/root.go create mode 100644 internal/config/config.go create mode 100644 internal/proxy/basicauth.go create mode 100644 internal/proxy/proxy.go diff --git a/.golangci.yml b/.golangci.yml new file mode 100644 index 0000000..40ed329 --- /dev/null +++ b/.golangci.yml @@ -0,0 +1,76 @@ +run: + # default concurrency is a available CPU number + concurrency: 4 + + # timeout for analysis, e.g. 30s, 5m, default is 1m + timeout: 5m + + # exit code when at least one issue was found, default is 1 + issues-exit-code: 1 + + # include test files or not, default is true + tests: true + +linters-settings: + lll: + line-length: 250 + golint: + min-confidence: 0 + gomnd: + settings: + mnd: + # don't include the "operation" and "assign" + checks: argument,case,condition,return + govet: + check-shadowing: false + + nolintlint: + allow-leading-space: false + allow-unused: false # report any unused nolint directives + require-specific: true # don't require nolint directives to be specific about which linter is being skipped + + maligned: + # print struct with more effective memory layout or not, false by default + suggest-new: true +linters: + disable-all: true + enable: + - bodyclose + - deadcode + - depguard + - dogsled + - dupl + - errcheck + - exhaustive + - funlen + - gochecknoinits + - goconst + - gocritic + - gocyclo + - gofmt + - goimports + - gomnd + - goprintffuncname + - gosec + - gosimple + - govet + - ineffassign + - interfacer + - lll + - maligned + - misspell + - nakedret + - noctx + - nolintlint + - rowserrcheck + - scopelint + - staticcheck + - structcheck + - stylecheck + - typecheck + - unconvert + - unparam + - unused + - varcheck + - whitespace + - wsl diff --git a/cmd/root.go b/cmd/root.go new file mode 100644 index 0000000..7560ee1 --- /dev/null +++ b/cmd/root.go @@ -0,0 +1,114 @@ +package cmd + +import ( + "context" + "fmt" + "os" + + "github.com/hierynomus/taipan" + home "github.com/mitchellh/go-homedir" + "github.com/rb3ckers/trafficmirror/internal/config" + "github.com/rb3ckers/trafficmirror/internal/proxy" + "github.com/rs/zerolog" + "github.com/spf13/cobra" +) + +var ( + Version string + Commit string + Date string +) + +var EnvPrefix = "TRAFFICMIRROR_" + +func RootCommand(cfg *config.Config) *cobra.Command { + var verbosity int + + cmd := &cobra.Command{ + Use: "trafficmirror", + Short: "Runs Traffic Mirror", + Long: ` +HTTP proxy that: +* sends requests to a main endpoint from which the response is returned +* can mirror the requests to any additional number of endpoints + +Additional targets are configured via PUT/DELETE on the '/targets?url='. +`, + Version: fmt.Sprintf("%s (Built on: %s, Commit: %s)", Version, Date, Commit), + PersistentPreRunE: func(cmd *cobra.Command, args []string) error { + switch verbosity { + case 0: + // Nothing to do + case 1: + zerolog.SetGlobalLevel(zerolog.InfoLevel) + case 2: //nolint:gomnd + zerolog.SetGlobalLevel(zerolog.DebugLevel) + default: + zerolog.SetGlobalLevel(zerolog.TraceLevel) + } + + return nil + }, + RunE: func(cmd *cobra.Command, args []string) error { + PrintUsage(cfg) + return proxy.Start(cmd.Context(), cfg) + }, + } + + cmd.PersistentFlags().CountVarP(&verbosity, "verbose", "v", "Print more verbose logging") + + cmd.Flags().StringP("listen", "l", ":8080", "Address to listen on and mirror traffic from") + cmd.Flags().StringP("main", "m", "http://localhost:8888", "Main proxy target, its responses will be returned to the client") + cmd.Flags().String("targets", "targets", "Path on which additional targets to mirror to can be added/deleted/listed via PUT, DELETE and GET") + cmd.Flags().String("targets-address", "", "Address on which the targets endpoint is made available. Leave empty to expose it on the address that is being mirrored") + cmd.Flags().String("password", "", "Provide a file that contains username/password to protect the configuration 'targets' endpoint. Contains 1 username/password combination separated by ':'.") + cmd.Flags().Int("fail-after", 30, "Remove a target when it has been failing for this many minutes.") //nolint:gomnd + cmd.Flags().Int("retry-after", 1, "After 5 successive failures a target is temporarily disabled, it will be retried after this many minutes.") + + return cmd +} + +func Execute(ctx context.Context) { + cfg := &config.Config{} + cmd := RootCommand(cfg) + + homeFolder, err := home.Expand("~/.trafficmirror") + if err != nil { + fmt.Printf("%s", err) + os.Exit(1) + } + + zerolog.SetGlobalLevel(zerolog.ErrorLevel) + + taipanConfig := &taipan.Config{ + DefaultConfigName: "trafficmirror", + ConfigurationPaths: []string{".", homeFolder}, + EnvironmentPrefix: EnvPrefix, + AddConfigFlag: true, + ConfigObject: cfg, + PrefixCommands: true, + } + + t := taipan.New(taipanConfig) + t.Inject(cmd) + + if err := cmd.ExecuteContext(ctx); err != nil { + fmt.Printf("🎃 %s\n", err) + os.Exit(1) + } +} + +func PrintUsage(cfg *config.Config) { + var targetsText string + if cfg.TargetsListenAddress != "" { + targetsText = fmt.Sprintf("http://%s/%s", cfg.TargetsListenAddress, cfg.TargetsEndpoint) + } else { + targetsText = fmt.Sprintf("http://%s/%s", cfg.ListenAddress, cfg.TargetsEndpoint) + } + + fmt.Printf("Add/remove/list mirror targets via PUT/DELETE/GET at %s:\n", targetsText) + fmt.Printf("List : curl %s\n", targetsText) + fmt.Printf("Add : curl -X PUT %s?url=http://localhost:5678\n", targetsText) + fmt.Printf("Remove: curl -X DELETE %s?url=http://localhost:5678\n", targetsText) + fmt.Println() +} diff --git a/datatypes/MirrorTargets.go b/datatypes/MirrorTargets.go index e668c26..f08d1b9 100644 --- a/datatypes/MirrorTargets.go +++ b/datatypes/MirrorTargets.go @@ -48,6 +48,7 @@ func (mt *MirrorTargets) Add(targets []string) { log.Printf("Adding %s to targets list.", targets) mt.Lock() defer mt.Unlock() + for _, url := range targets { mt.targets[url] = newTargetState(url, mt.persistentFailureTimeout, mt.retryAfter, func(target string) { mt.Delete([]string{target}) @@ -59,6 +60,7 @@ func (mt *MirrorTargets) Delete(targets []string) { log.Printf("Removing %s from targets list.", targets) mt.Lock() defer mt.Unlock() + for _, url := range targets { delete(mt.targets, url) } @@ -67,6 +69,7 @@ func (mt *MirrorTargets) Delete(targets []string) { func (mt *MirrorTargets) ForEach(f func(string, *gobreaker.CircuitBreaker)) { mt.RLock() defer mt.RUnlock() + for url, target := range mt.targets { f(url, target.circuitBreaker) } @@ -75,8 +78,10 @@ func (mt *MirrorTargets) ForEach(f func(string, *gobreaker.CircuitBreaker)) { func (mt *MirrorTargets) ListTargets() []*Target { targets := make([]*Target, len(mt.targets)) i := 0 + for url, target := range mt.targets { var state string + switch target.circuitBreaker.State() { case gobreaker.StateOpen: state = "failing" @@ -93,30 +98,38 @@ func (mt *MirrorTargets) ListTargets() []*Target { FailingSince: target.firstFailure, State: state, } - i = i + 1 + + i++ } + return targets } func (ts *targetState) onBreakerChange(name string, from gobreaker.State, to gobreaker.State) { - if from == gobreaker.StateClosed && to == gobreaker.StateOpen { - ts.Lock() - defer ts.Unlock() - ts.firstFailure = time.Now() - log.Printf("Temporary not mirroring to target %s.", name) - } else if to == gobreaker.StateOpen { - ts.Lock() - defer ts.Unlock() - if !ts.firstFailure.IsZero() && time.Now().Sub(ts.firstFailure) > ts.persistentFailureTimeout { - log.Printf("%s is persistently failing.", name) - ts.onTargetFailed(name) + switch to { + case gobreaker.StateOpen: + if from == gobreaker.StateClosed { + ts.Lock() + defer ts.Unlock() + ts.firstFailure = time.Now() + + log.Printf("Temporary not mirroring to target %s.", name) + } else { + ts.Lock() + defer ts.Unlock() + if !ts.firstFailure.IsZero() && time.Since(ts.firstFailure) > ts.persistentFailureTimeout { + log.Printf("%s is persistently failing.", name) + ts.onTargetFailed(name) + } } - } else if to == gobreaker.StateHalfOpen { + case gobreaker.StateHalfOpen: log.Printf("Retrying target %s.", name) - } else if to == gobreaker.StateClosed { + + case gobreaker.StateClosed: ts.Lock() defer ts.Unlock() ts.firstFailure = time.Time{} + log.Printf("Resuming mirroring to target %s.", name) } } @@ -135,5 +148,6 @@ func newTargetState(name string, persistentFailureTimeout time.Duration, retryAf OnStateChange: targetState.onBreakerChange, } targetState.circuitBreaker = gobreaker.NewCircuitBreaker(settings) + return targetState } diff --git a/go.mod b/go.mod index d8cd89c..33dbf96 100644 --- a/go.mod +++ b/go.mod @@ -1,5 +1,12 @@ module github.com/rb3ckers/trafficmirror -go 1.12 +go 1.16 -require github.com/sony/gobreaker v0.4.1 +require ( + github.com/hierynomus/taipan v1.2.0 + github.com/mcuadros/go-defaults v1.2.0 + github.com/mitchellh/go-homedir v1.1.0 + github.com/rs/zerolog v1.23.0 + github.com/sony/gobreaker v0.4.1 + github.com/spf13/cobra v1.2.1 +) diff --git a/go.sum b/go.sum index eaabafa..0d51f9b 100644 --- a/go.sum +++ b/go.sum @@ -1,9 +1,694 @@ -github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= +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 v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +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= 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new file mode 100644 index 0000000..298e6f5 --- /dev/null +++ b/internal/config/config.go @@ -0,0 +1,28 @@ +package config + +import ( + "github.com/mcuadros/go-defaults" +) + +type Config struct { + MainProxyTarget string `yaml:"main" default:"http://localhost:8888"` + ListenAddress string `yaml:"listen" default:":8080"` + TargetsEndpoint string `yaml:"targets" default:"targets"` + TargetsListenAddress string `yaml:"targets-address"` + PasswordFile string `yaml:"password"` + PersistentFailureTimeout int `yaml:"fail-after" default:"30"` + RetryAfter int `yaml:"retry-after" default:"1"` + Mirrors []string `yaml:"mirrors"` +} + +func (s *Config) UnmarshalYAML(unmarshal func(interface{}) error) error { + defaults.SetDefaults(s) + + type cfg Config + + if err := unmarshal((*cfg)(s)); err != nil { + return err + } + + return nil +} diff --git a/internal/proxy/basicauth.go b/internal/proxy/basicauth.go new file mode 100644 index 0000000..b5ecedc --- /dev/null +++ b/internal/proxy/basicauth.go @@ -0,0 +1,32 @@ +package proxy + +import ( + "crypto/subtle" + "net/http" +) + +// BasicAuth wraps a handler requiring HTTP basic auth for it using the given +// username and password and the specified realm, which shouldn't contain quotes. +// From StackOverflow: https://stackoverflow.com/questions/21936332/idiomatic-way-of-requiring-http-basic-auth-in-go/39591234#39591234 +// +// Most web browser display a dialog with something like: +// +// The website says: "" +// +// Which is really stupid so you may want to set the realm to a message rather than +// an actual realm. +func BasicAuth(handler http.HandlerFunc, username, password, realm string) http.HandlerFunc { + return func(w http.ResponseWriter, r *http.Request) { + user, pass, ok := r.BasicAuth() + + if !ok || subtle.ConstantTimeCompare([]byte(user), []byte(username)) != 1 || subtle.ConstantTimeCompare([]byte(pass), []byte(password)) != 1 { + w.Header().Set("WWW-Authenticate", `Basic realm="`+realm+`"`) + w.WriteHeader(http.StatusUnauthorized) + w.Write([]byte("Unauthorized.\n")) //nolint:errcheck + + return + } + + handler(w, r) + } +} diff --git a/internal/proxy/proxy.go b/internal/proxy/proxy.go new file mode 100644 index 0000000..5a50267 --- /dev/null +++ b/internal/proxy/proxy.go @@ -0,0 +1,165 @@ +package proxy + +import ( + "bytes" + "context" + "fmt" + "io" + "io/ioutil" + "log" + "net/http" + "net/http/httputil" + "net/url" + "strings" + "time" + + "github.com/rb3ckers/trafficmirror/datatypes" + "github.com/rb3ckers/trafficmirror/internal/config" + "github.com/sony/gobreaker" +) + +var netClient = &http.Client{ + Timeout: time.Second * 20, +} + +var targets *datatypes.MirrorTargets + +func Start(ctx context.Context, cfg *config.Config) error { + targets = datatypes.NewMirrorTargets(datatypes.MirrorSettings{ + PersistentFailureTimeout: time.Duration(cfg.PersistentFailureTimeout) * time.Minute, + RetryAfter: time.Duration(cfg.RetryAfter) * time.Minute, + }) + + url, _ := url.Parse(cfg.MainProxyTarget) + + mirrorMux := http.NewServeMux() + + var targetsMux *http.ServeMux + + if cfg.TargetsListenAddress != "" { + targetsMux = http.NewServeMux() + } else { + targetsMux = mirrorMux + } + + proxyTo := httputil.NewSingleHostReverseProxy(url) + + if cfg.PasswordFile != "" { + username, password, err := parseUsernamePassword(cfg.PasswordFile) + if err != nil { + return err + } + + targetsMux.HandleFunc("/"+cfg.TargetsEndpoint, BasicAuth(mirrorsHandler, username, password, "Please provide username and password for changing mirror targets")) + } else { + targetsMux.HandleFunc("/"+cfg.TargetsEndpoint, mirrorsHandler) + } + + mirrorMux.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) { + body := bufferRequest(req) + + // Update the headers to allow for SSL redirection + req.URL.Host = url.Host + req.URL.Scheme = url.Scheme + req.Host = url.Host + + proxyTo.ServeHTTP(res, req) + go sendToMirrors(req, body) + }) + + // start configuration server if needed + if cfg.TargetsListenAddress != "" { + go func() { + if err := http.ListenAndServe(cfg.TargetsListenAddress, targetsMux); err != nil { + panic(err) + } + }() + } + + // start mirror server + if err := http.ListenAndServe(cfg.ListenAddress, mirrorMux); err != nil { + panic(err) + } + + return nil +} + +func mirrorsHandler(res http.ResponseWriter, req *http.Request) { + if req.Method == http.MethodGet { + for _, target := range targets.ListTargets() { + if target.State == "alive" { + fmt.Fprintf(res, "%s: %s\n", target.Name, target.State) + } else { + fmt.Fprintf(res, "%s: %s (since: %s)\n", target.Name, target.State, target.FailingSince.UTC().Format(time.RFC3339)) + } + } + + return + } + + req.ParseForm() + + targetURLs, inForm := req.Form["url"] + + if !inForm { + http.Error(res, "Missing required field: 'url'.", http.StatusBadRequest) + return + } + + if req.Method == http.MethodPut { + targets.Add(targetURLs) + } else if req.Method == http.MethodDelete { + targets.Delete(targetURLs) + } +} + +func sendToMirrors(req *http.Request, body []byte) { + targets.ForEach(func(target string, breaker *gobreaker.CircuitBreaker) { + go mirrorTo(target, req, body, breaker) + }) +} + +func mirrorTo(targetURL string, req *http.Request, body []byte, breaker *gobreaker.CircuitBreaker) { + breaker.Execute(func() (interface{}, error) { //nolint:errcheck + url := fmt.Sprintf("%s%s", targetURL, req.RequestURI) + + newRequest, _ := http.NewRequest(req.Method, url, bytes.NewReader(body)) //nolint:noctx + newRequest.Header = req.Header + + response, err := netClient.Do(newRequest) + if err != nil { + log.Printf("Error reading response: %v", err) + return nil, err + } + defer response.Body.Close() + // Drain the body, but discard it, to make sure connection can be reused + return io.Copy(ioutil.Discard, response.Body) + }) +} + +func parseUsernamePassword(passwordFile string) (string, string, error) { + data, err := ioutil.ReadFile(passwordFile) + if err != nil { + return "", "", fmt.Errorf("failed to load password file") + } + + split := strings.SplitN(string(data), ":", 2) //nolint:gomnd + if len(split) != 2 { //nolint:gomnd + return "", "", fmt.Errorf("failed to parse username/password. Expected 2 find username/password separated by a new line") + } + + return split[0], split[1], nil +} + +func bufferRequest(req *http.Request) []byte { + // Read body to buffer + body, err := ioutil.ReadAll(req.Body) + if err != nil { + log.Printf("Error reading body: %v", err) + } + + // Restore the body so we can send it multiple times + req.Body = ioutil.NopCloser(bytes.NewBuffer(body)) + + return body +} diff --git a/main.go b/main.go index e2639d7..dc13400 100644 --- a/main.go +++ b/main.go @@ -1,228 +1,13 @@ package main import ( - "bytes" - "crypto/subtle" - "flag" - "fmt" - "io" - "io/ioutil" - "log" - "net/http" - "net/http/httputil" - "net/url" - "strings" - "time" + "context" - "github.com/sony/gobreaker" - - "github.com/rb3ckers/trafficmirror/datatypes" -) - -var ( - Version string - Commit string - Date string + "github.com/rb3ckers/trafficmirror/cmd" + "github.com/rs/zerolog/log" ) -var netClient = &http.Client{ - Timeout: time.Second * 20, -} - -var targets *datatypes.MirrorTargets - func main() { - listenAddress := flag.String("listen", ":8080", "Address to listen on and mirror traffic from") - proxyTarget := flag.String("main", "http://localhost:8888", "Main proxy target, its responses will be returned to the client") - targetsEndpoint := flag.String("targets", "targets", "Path on which additional targets to mirror to can be added/deleted/listed via PUT, DELETE and GET") - targetsAddress := flag.String("targets-address", "", "Address on which the targets endpoint is made available. Leave empty to expose it on the address that is being mirrored") - passwordFile := flag.String("password", "", "Provide a file that contains username/password to protect the configuration 'targets' endpoint. Contains 1 username/password combination separated by ':'.") - persistentFailureTimeout := flag.Duration("fail-after", time.Minute*30, "Remove a target when it has been failing for this duration.") - retryAfter := flag.Duration("retry-after", time.Minute*1, "After 5 successive failures a target is temporarily disabled, it will be retried after this timeout.") - - help := flag.Bool("help", false, "Print help") - - flag.Parse() - - if *help { - fmt.Printf("HTTP proxy that:") - fmt.Printf("* sends requests to a main endpoint from which the response is returned") - fmt.Printf("* can mirror the requests to any additional number of endpoints") - fmt.Printf("") - fmt.Printf("Additional targets are configured via PUT/DELETE on the `/targets?url=`.") - - flag.PrintDefaults() - return - } - - fmt.Printf("Traffic Mirror %s (Built on: %ss, Commit: %s)\n", Version, Date, Commit) - fmt.Printf("Mirroring traffic from %s to %s\n", *listenAddress, *proxyTarget) - var targetsText string - if *targetsAddress != "" { - targetsText = fmt.Sprintf("http://%s/%s", *targetsAddress, *targetsEndpoint) - } else { - targetsText = fmt.Sprintf("http://%s/%s", *listenAddress, *targetsEndpoint) - } - - fmt.Printf("Add/remove/list mirror targets via PUT/DELETE/GET at %s:\n", targetsText) - fmt.Printf("List : curl %s\n", targetsText) - fmt.Printf("Add : curl -X PUT %s?url=http://localhost:5678\n", targetsText) - fmt.Printf("Remove: curl -X DELETE %s?url=http://localhost:5678\n", targetsText) - fmt.Println() - - targets = datatypes.NewMirrorTargets(datatypes.MirrorSettings{ - PersistentFailureTimeout: *persistentFailureTimeout, - RetryAfter: *retryAfter, - }) - - url, _ := url.Parse(*proxyTarget) - - mirrorMux := http.NewServeMux() - var targetsMux *http.ServeMux - - if *targetsAddress != "" { - targetsMux = http.NewServeMux() - } else { - targetsMux = mirrorMux - } - - proxyTo := httputil.NewSingleHostReverseProxy(url) - - if *passwordFile != "" { - username, password := parseUsernamePassword(*passwordFile) - targetsMux.HandleFunc("/"+*targetsEndpoint, BasicAuth(mirrorsHandler, username, password, "Please provide username and password for changing mirror targets")) - } else { - targetsMux.HandleFunc("/"+*targetsEndpoint, mirrorsHandler) - } - - mirrorMux.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) { - body := bufferRequest(req) - - // Update the headers to allow for SSL redirection - req.URL.Host = url.Host - req.URL.Scheme = url.Scheme - req.Host = url.Host - - proxyTo.ServeHTTP(res, req) - go sendToMirrors(req, body) - }) - - // start configuration server if needed - if *targetsAddress != "" { - go func() { - if err := http.ListenAndServe(*targetsAddress, targetsMux); err != nil { - panic(err) - } - }() - } - - // start mirror server - if err := http.ListenAndServe(*listenAddress, mirrorMux); err != nil { - panic(err) - } -} - -func bufferRequest(req *http.Request) []byte { - // Read body to buffer - body, err := ioutil.ReadAll(req.Body) - if err != nil { - log.Printf("Error reading body: %v", err) - } - - // Restore the body so we can send it multiple times - req.Body = ioutil.NopCloser(bytes.NewBuffer(body)) - - return body -} - -func sendToMirrors(req *http.Request, body []byte) { - targets.ForEach(func(target string, breaker *gobreaker.CircuitBreaker) { - go mirrorTo(target, req, body, breaker) - }) -} - -func mirrorTo(targetURL string, req *http.Request, body []byte, breaker *gobreaker.CircuitBreaker) { - breaker.Execute(func() (interface{}, error) { - url := fmt.Sprintf("%s%s", targetURL, req.RequestURI) - - newRequest, _ := http.NewRequest(req.Method, url, bytes.NewReader(body)) - newRequest.Header = req.Header - - response, err := netClient.Do(newRequest) - if err != nil { - log.Printf("Error reading response: %v", err) - return nil, err - } - defer response.Body.Close() - // Drain the body, but discard it, to make sure connection can be reused - io.Copy(ioutil.Discard, response.Body) - return nil, nil - }) -} - -func mirrorsHandler(res http.ResponseWriter, req *http.Request) { - if req.Method == http.MethodGet { - for _, target := range targets.ListTargets() { - if target.State == "alive" { - fmt.Fprintf(res, "%s: %s\n", target.Name, target.State) - } else { - fmt.Fprintf(res, "%s: %s (since: %s)\n", target.Name, target.State, target.FailingSince.UTC().Format(time.RFC3339)) - } - } - return - } - - req.ParseForm() - - targetURLs, inForm := req.Form["url"] - - if !inForm { - http.Error(res, "Missing required field: 'url'.", http.StatusBadRequest) - return - } - - if req.Method == http.MethodPut { - targets.Add(targetURLs) - } else if req.Method == http.MethodDelete { - targets.Delete(targetURLs) - } -} - -// BasicAuth wraps a handler requiring HTTP basic auth for it using the given -// username and password and the specified realm, which shouldn't contain quotes. -// From StackOverflow: https://stackoverflow.com/questions/21936332/idiomatic-way-of-requiring-http-basic-auth-in-go/39591234#39591234 -// -// Most web browser display a dialog with something like: -// -// The website says: "" -// -// Which is really stupid so you may want to set the realm to a message rather than -// an actual realm. -func BasicAuth(handler http.HandlerFunc, username, password, realm string) http.HandlerFunc { - - return func(w http.ResponseWriter, r *http.Request) { - - user, pass, ok := r.BasicAuth() - - if !ok || subtle.ConstantTimeCompare([]byte(user), []byte(username)) != 1 || subtle.ConstantTimeCompare([]byte(pass), []byte(password)) != 1 { - w.Header().Set("WWW-Authenticate", `Basic realm="`+realm+`"`) - w.WriteHeader(401) - w.Write([]byte("Unauthorised.\n")) - return - } - - handler(w, r) - } -} - -func parseUsernamePassword(passwordFile string) (string, string) { - data, err := ioutil.ReadFile(passwordFile) - if err != nil { - panic("Failed to load password file.") - } - split := strings.SplitN(string(data), ":", 2) - if len(split) != 2 { - panic("Failed to parse username/password. Expected 2 find username/password separated by a new line.") - } - return split[0], split[1] + ctx := log.Logger.WithContext(context.Background()) + cmd.Execute(ctx) } From c05a043012e769874abb33f0ce42404eab4e6954 Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Fri, 27 Aug 2021 00:38:48 +0200 Subject: [PATCH 3/8] Major rewrite - Split up code over several structs - Improved cleanup/shutdown logic - Added flag to start with set of mirrors configured Signed-off-by: Jeroen van Erp --- cmd/root.go | 38 ++++++++- datatypes/MirrorTargets.go | 153 --------------------------------- go.mod | 3 + go.sum | 33 +++++++- internal/config/config.go | 9 +- internal/mirror/mirror.go | 132 +++++++++++++++++++++++++++++ internal/mirror/reflector.go | 89 ++++++++++++++++++++ internal/mirror/request.go | 15 ++++ internal/proxy/handler.go | 25 ++++++ internal/proxy/proxy.go | 159 ++++++++++++++++++----------------- 10 files changed, 423 insertions(+), 233 deletions(-) delete mode 100644 datatypes/MirrorTargets.go create mode 100644 internal/mirror/mirror.go create mode 100644 internal/mirror/reflector.go create mode 100644 internal/mirror/request.go create mode 100644 internal/proxy/handler.go diff --git a/cmd/root.go b/cmd/root.go index 7560ee1..f9804b5 100644 --- a/cmd/root.go +++ b/cmd/root.go @@ -3,7 +3,10 @@ package cmd import ( "context" "fmt" + "log" "os" + "os/signal" + "syscall" "github.com/hierynomus/taipan" home "github.com/mitchellh/go-homedir" @@ -51,7 +54,11 @@ Additional targets are configured via PUT/DELETE on the '/targets?url= }, RunE: func(cmd *cobra.Command, args []string) error { PrintUsage(cfg) - return proxy.Start(cmd.Context(), cfg) + if err := RunProxy(cfg); err != nil { + return err + } + + return nil }, } @@ -64,10 +71,39 @@ Additional targets are configured via PUT/DELETE on the '/targets?url= cmd.Flags().String("password", "", "Provide a file that contains username/password to protect the configuration 'targets' endpoint. Contains 1 username/password combination separated by ':'.") cmd.Flags().Int("fail-after", 30, "Remove a target when it has been failing for this many minutes.") //nolint:gomnd cmd.Flags().Int("retry-after", 1, "After 5 successive failures a target is temporarily disabled, it will be retried after this many minutes.") + cmd.Flags().StringSlice("mirror", []string{}, "Mirror traffic to additional targets") return cmd } +func RunProxy(cfg *config.Config) error { + sigs := make(chan os.Signal, 1) + done := make(chan bool, 1) + + signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) + + p := proxy.NewProxy(cfg) + + go func() { + sig := <-sigs + log.Printf("Received signal '%s', exiting\n", sig) + + if err := p.Stop(); err != nil { + panic(err) + } + + done <- true + }() + + if err := p.Start(context.Background()); err != nil { + return err + } + + <-done + + return nil +} + func Execute(ctx context.Context) { cfg := &config.Config{} cmd := RootCommand(cfg) diff --git a/datatypes/MirrorTargets.go b/datatypes/MirrorTargets.go deleted file mode 100644 index f08d1b9..0000000 --- a/datatypes/MirrorTargets.go +++ /dev/null @@ -1,153 +0,0 @@ -package datatypes - -import ( - "log" - "sync" - "time" - - "github.com/sony/gobreaker" -) - -// MirrorTargets has the set of target URLs to mirror to -// It protects these for multi threaded access -type MirrorTargets struct { - sync.RWMutex - targets map[string]*targetState - persistentFailureTimeout time.Duration - retryAfter time.Duration -} - -type MirrorSettings struct { - PersistentFailureTimeout time.Duration - RetryAfter time.Duration -} - -type Target struct { - Name string - FailingSince time.Time - State string -} - -type targetState struct { - sync.Mutex - firstFailure time.Time - persistentFailureTimeout time.Duration - circuitBreaker *gobreaker.CircuitBreaker - onTargetFailed func(target string) -} - -func NewMirrorTargets(settings MirrorSettings) *MirrorTargets { - return &MirrorTargets{ - targets: make(map[string]*targetState), - persistentFailureTimeout: settings.PersistentFailureTimeout, - retryAfter: settings.RetryAfter, - } -} - -func (mt *MirrorTargets) Add(targets []string) { - log.Printf("Adding %s to targets list.", targets) - mt.Lock() - defer mt.Unlock() - - for _, url := range targets { - mt.targets[url] = newTargetState(url, mt.persistentFailureTimeout, mt.retryAfter, func(target string) { - mt.Delete([]string{target}) - }) - } -} - -func (mt *MirrorTargets) Delete(targets []string) { - log.Printf("Removing %s from targets list.", targets) - mt.Lock() - defer mt.Unlock() - - for _, url := range targets { - delete(mt.targets, url) - } -} - -func (mt *MirrorTargets) ForEach(f func(string, *gobreaker.CircuitBreaker)) { - mt.RLock() - defer mt.RUnlock() - - for url, target := range mt.targets { - f(url, target.circuitBreaker) - } -} - -func (mt *MirrorTargets) ListTargets() []*Target { - targets := make([]*Target, len(mt.targets)) - i := 0 - - for url, target := range mt.targets { - var state string - - switch target.circuitBreaker.State() { - case gobreaker.StateOpen: - state = "failing" - case gobreaker.StateHalfOpen: - state = "retrying" - case gobreaker.StateClosed: - state = "alive" - default: - state = "unknown" - } - - targets[i] = &Target{ - Name: url, - FailingSince: target.firstFailure, - State: state, - } - - i++ - } - - return targets -} - -func (ts *targetState) onBreakerChange(name string, from gobreaker.State, to gobreaker.State) { - switch to { - case gobreaker.StateOpen: - if from == gobreaker.StateClosed { - ts.Lock() - defer ts.Unlock() - ts.firstFailure = time.Now() - - log.Printf("Temporary not mirroring to target %s.", name) - } else { - ts.Lock() - defer ts.Unlock() - if !ts.firstFailure.IsZero() && time.Since(ts.firstFailure) > ts.persistentFailureTimeout { - log.Printf("%s is persistently failing.", name) - ts.onTargetFailed(name) - } - } - case gobreaker.StateHalfOpen: - log.Printf("Retrying target %s.", name) - - case gobreaker.StateClosed: - ts.Lock() - defer ts.Unlock() - ts.firstFailure = time.Time{} - - log.Printf("Resuming mirroring to target %s.", name) - } -} - -func newTargetState(name string, persistentFailureTimeout time.Duration, retryAfter time.Duration, onTargetFailed func(target string)) *targetState { - targetState := &targetState{ - circuitBreaker: nil, - onTargetFailed: onTargetFailed, - persistentFailureTimeout: persistentFailureTimeout, - } - settings := gobreaker.Settings{ - Name: name, - MaxRequests: 1, - Interval: 0, // Never clear counts - Timeout: retryAfter, // When open retry after 60 seconds - OnStateChange: targetState.onBreakerChange, - } - targetState.circuitBreaker = gobreaker.NewCircuitBreaker(settings) - - return targetState -} diff --git a/go.mod b/go.mod index 33dbf96..ec05990 100644 --- a/go.mod +++ b/go.mod @@ -3,10 +3,13 @@ module github.com/rb3ckers/trafficmirror go 1.16 require ( + github.com/gin-gonic/gin v1.7.4 github.com/hierynomus/taipan v1.2.0 github.com/mcuadros/go-defaults v1.2.0 github.com/mitchellh/go-homedir v1.1.0 github.com/rs/zerolog v1.23.0 github.com/sony/gobreaker v0.4.1 github.com/spf13/cobra v1.2.1 + github.com/stretchr/testify v1.7.0 + golang.org/x/text v0.3.6 // indirect ) diff --git a/go.sum b/go.sum index 0d51f9b..6f6f53e 100644 --- a/go.sum +++ b/go.sum @@ -84,12 +84,24 @@ github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMo github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4= github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ= github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= +github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE= +github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI= +github.com/gin-gonic/gin v1.7.4 h1:QmUZXrvJ9qZ3GfWvQ+2wnW/1ePrTEJqPKMYEU3lD/DM= +github.com/gin-gonic/gin v1.7.4/go.mod h1:jD2toBW3GZUr5UMcdrwQA10I7RuaFOl/SGeDjXkfUtY= github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU= github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE= github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk= +github.com/go-playground/assert/v2 v2.0.1 h1:MsBgLAaY856+nPRTKrp3/OZK38U/wa0CcBYNjji3q3A= +github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4= +github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8ceBS/t7Q= +github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8= +github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no= +github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA= +github.com/go-playground/validator/v10 v10.4.1 h1:pH2c5ADXtd66mxoE0Zm9SUhxE20r7aM3F26W0hOn+GE= +github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4= github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= @@ -124,6 +136,7 @@ github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI= github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk= github.com/golang/protobuf v1.5.1/go.mod h1:DopwsBzvsk0Fs44TXzsVbJyPhcCPeIwnvohx4u74HPM= +github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw= github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY= github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ= github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ= @@ -137,6 +150,7 @@ github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU= github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg= github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs= @@ -199,6 +213,8 @@ github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc= github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg= github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo= github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU= +github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4= +github.com/json-iterator/go v1.1.11 h1:uVUAXhF2To8cbw/3xN3pxj6kk7TYKs98NIrTqPlMWAQ= github.com/json-iterator/go v1.1.11/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4= github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU= github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/XSXhF0NWZEnDohbsk= @@ -215,11 +231,15 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN 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/leodido/go-urn v1.2.0 h1:hpXL4XnriNwQ/ABnpepYM/1vCLWNDfUNts8dX3xTG6Y= +github.com/leodido/go-urn v1.2.0/go.mod h1:+8+nEpDfqqsY+g338gtMEUOtuK+4dEMhiQEgxpxOKII= github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ= github.com/magiconair/properties v1.8.5 h1:b6kJs+EmPFMYGkow9GiUyCyOvIwYetYJ3fSaWak/Gls= github.com/magiconair/properties v1.8.5/go.mod h1:y3VJvCyxH9uVvJTWEGAELF3aiYNyPKd5NZ3oSwXrF60= github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU= github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4= +github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY= +github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU= github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0= github.com/mcuadros/go-defaults v1.2.0 h1:FODb8WSf0uGaY8elWJAkoLL0Ri6AlZ1bFlenk56oZtc= github.com/mcuadros/go-defaults v1.2.0/go.mod h1:WEZtHEVIGYVDqkKSWBdWKUVdRyKlMfulPaGDWIVeCWY= @@ -236,8 +256,10 @@ github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh github.com/mitchellh/mapstructure v1.4.1 h1:CpVNEelQCZBooIPDn+AR3NpivK/TIKU8bDxdASFVQag= github.com/mitchellh/mapstructure v1.4.1/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo= github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q= +github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg= github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q= github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0= +github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI= github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0= github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U= github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs= @@ -316,6 +338,10 @@ github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/ github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s= github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw= github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U= +github.com/ugorji/go v1.1.7 h1:/68gy2h+1mWMrwZFeD1kQialdSzAb432dtpeJ42ovdo= +github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw= +github.com/ugorji/go/codec v1.1.7 h1:2SvQaVZ1ouYrrKKwoSk2pzd4A9evlKJb9oTL+OaLUSs= +github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY= github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU= github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= @@ -346,6 +372,7 @@ golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8U golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= +golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI= golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= @@ -462,6 +489,7 @@ golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= @@ -495,8 +523,9 @@ golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk= golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= -golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ= golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= +golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M= +golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= @@ -556,6 +585,7 @@ golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk= golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= +golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE= golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE= google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M= @@ -658,6 +688,7 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4= google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c= google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw= +google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk= google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc= gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= diff --git a/internal/config/config.go b/internal/config/config.go index 298e6f5..d74951f 100644 --- a/internal/config/config.go +++ b/internal/config/config.go @@ -12,7 +12,7 @@ type Config struct { PasswordFile string `yaml:"password"` PersistentFailureTimeout int `yaml:"fail-after" default:"30"` RetryAfter int `yaml:"retry-after" default:"1"` - Mirrors []string `yaml:"mirrors"` + Mirrors []string `yaml:"mirror"` } func (s *Config) UnmarshalYAML(unmarshal func(interface{}) error) error { @@ -26,3 +26,10 @@ func (s *Config) UnmarshalYAML(unmarshal func(interface{}) error) error { return nil } + +func Default() *Config { + c := &Config{} + defaults.SetDefaults(c) + + return c +} diff --git a/internal/mirror/mirror.go b/internal/mirror/mirror.go new file mode 100644 index 0000000..28a5f3f --- /dev/null +++ b/internal/mirror/mirror.go @@ -0,0 +1,132 @@ +package mirror + +import ( + "bytes" + "fmt" + "io" + "io/ioutil" + "log" + "net/http" + "sync" + "time" + + "github.com/sony/gobreaker" +) + +type Mirror struct { + sync.Mutex + netClient *http.Client + targetURL string + breaker *gobreaker.CircuitBreaker + firstFailureTime time.Time + persistentFailureTimeout time.Duration + failureCh chan<- string +} + +type MirrorState string + +var ( + StateFailing MirrorState = "failing" + StateRetrying MirrorState = "retrying" + StateAlive MirrorState = "alive" + StateUnkown MirrorState = "unknown" +) + +type MirrorStatus struct { + State MirrorState + FailingSince time.Time + URL string +} + +func NewMirror(targetURL string, retryAfter time.Duration, persistentFailureTimeout time.Duration, failureCh chan<- string) *Mirror { + mirror := &Mirror{ + netClient: &http.Client{ + Timeout: time.Second * 20, + }, + persistentFailureTimeout: persistentFailureTimeout, + targetURL: targetURL, + failureCh: failureCh, + } + + settings := gobreaker.Settings{ + Name: targetURL, + MaxRequests: 1, + Interval: 0, // Never clear counts + Timeout: retryAfter, // When open retry after 60 seconds + OnStateChange: mirror.onBreakerChange, + } + + breaker := gobreaker.NewCircuitBreaker(settings) + + mirror.breaker = breaker + + return mirror +} + +func (m *Mirror) onBreakerChange(name string, from gobreaker.State, to gobreaker.State) { + switch to { + case gobreaker.StateOpen: + if from == gobreaker.StateClosed { + m.Lock() + defer m.Unlock() + m.firstFailureTime = time.Now() + + log.Printf("Temporary not mirroring to target %s.", name) + } else { + m.Lock() + defer m.Unlock() + if !m.firstFailureTime.IsZero() && time.Since(m.firstFailureTime) > m.persistentFailureTimeout { + log.Printf("%s is persistently failing.", name) + m.failureCh <- m.targetURL + } + } + case gobreaker.StateHalfOpen: + log.Printf("Retrying target %s.", name) + + case gobreaker.StateClosed: + m.Lock() + defer m.Unlock() + m.firstFailureTime = time.Time{} + + log.Printf("Resuming mirroring to target %s.", name) + } +} + +func (m *Mirror) Reflect(req *Request) { + m.breaker.Execute(func() (interface{}, error) { //nolint:errcheck + url := fmt.Sprintf("%s%s", m.targetURL, req.originalRequest.RequestURI) + + newRequest, _ := http.NewRequest(req.originalRequest.Method, url, bytes.NewReader(req.body)) //nolint:noctx + newRequest.Header = req.originalRequest.Header + + response, err := m.netClient.Do(newRequest) + if err != nil { + log.Printf("Error reading response: %v", err) + return nil, err + } + defer response.Body.Close() + // Drain the body, but discard it, to make sure connection can be reused + return io.Copy(ioutil.Discard, response.Body) + }) +} + +func (m *Mirror) GetStatus() *MirrorStatus { + var state MirrorState + + switch m.breaker.State() { + case gobreaker.StateOpen: + state = StateFailing + case gobreaker.StateHalfOpen: + state = StateRetrying + case gobreaker.StateClosed: + state = StateAlive + default: + state = StateUnkown + } + + return &MirrorStatus{ + State: state, + FailingSince: m.firstFailureTime, + URL: m.targetURL, + } +} diff --git a/internal/mirror/reflector.go b/internal/mirror/reflector.go new file mode 100644 index 0000000..2514712 --- /dev/null +++ b/internal/mirror/reflector.go @@ -0,0 +1,89 @@ +package mirror + +import ( + "log" + "sync" + "time" + + "github.com/rb3ckers/trafficmirror/internal/config" +) + +type Reflector struct { + sync.RWMutex + mirrors map[string]*Mirror + IncomingCh chan *Request + DoneCh chan bool + MirrorFailureChan chan string + config *config.Config +} + +func NewReflector(config *config.Config) *Reflector { + return &Reflector{ + mirrors: make(map[string]*Mirror), + IncomingCh: make(chan *Request), + DoneCh: make(chan bool), + MirrorFailureChan: make(chan string), + config: config, + } +} + +func (r *Reflector) Reflect() { + log.Printf("Reflector started.") + + for { + select { + case req := <-r.IncomingCh: + r.sendToMirrors(req) + case url := <-r.MirrorFailureChan: + log.Printf("Mirror '%s' has persistent failures", url) + r.RemoveMirrors([]string{url}) + case <-r.DoneCh: + return + } + } +} + +func (r *Reflector) sendToMirrors(req *Request) { + r.RLock() + defer r.RUnlock() + + for _, mirror := range r.mirrors { + go mirror.Reflect(req) + } +} + +func (r *Reflector) AddMirrors(urls []string) { + r.Lock() + defer r.Unlock() + + for _, url := range urls { + log.Printf("Adding '%s' to mirror list.", url) + r.mirrors[url] = NewMirror(url, time.Duration(r.config.RetryAfter)*time.Minute, time.Duration(r.config.PersistentFailureTimeout)*time.Minute, r.MirrorFailureChan) + } +} + +func (r *Reflector) RemoveMirrors(urls []string) { + log.Printf("Removing '%s' from mirror list.", urls) + r.Lock() + defer r.Unlock() + + for _, url := range urls { + delete(r.mirrors, url) + } +} + +func (r *Reflector) ListMirrors() []*MirrorStatus { + targets := make([]*MirrorStatus, len(r.mirrors)) + i := 0 + + for _, target := range r.mirrors { + targets[i] = target.GetStatus() + i++ + } + + return targets +} + +func (r *Reflector) Close() { + r.DoneCh <- true +} diff --git a/internal/mirror/request.go b/internal/mirror/request.go new file mode 100644 index 0000000..2a5da30 --- /dev/null +++ b/internal/mirror/request.go @@ -0,0 +1,15 @@ +package mirror + +import "net/http" + +type Request struct { + originalRequest *http.Request + body []byte +} + +func NewRequest(req *http.Request, body []byte) *Request { + return &Request{ + originalRequest: req, + body: body, + } +} diff --git a/internal/proxy/handler.go b/internal/proxy/handler.go new file mode 100644 index 0000000..0252ae2 --- /dev/null +++ b/internal/proxy/handler.go @@ -0,0 +1,25 @@ +package proxy + +import ( + "net/http" + "net/http/httputil" + "net/url" + + "github.com/rb3ckers/trafficmirror/internal/mirror" +) + +func ReverseProxyHandler(reflector *mirror.Reflector, url *url.URL) func(res http.ResponseWriter, req *http.Request) { + return func(res http.ResponseWriter, req *http.Request) { + proxyTo := httputil.NewSingleHostReverseProxy(url) + + body := bufferRequest(req) + + // Update the headers to allow for SSL redirection + req.URL.Host = url.Host + req.URL.Scheme = url.Scheme + req.Host = url.Host + + proxyTo.ServeHTTP(res, req) + reflector.IncomingCh <- mirror.NewRequest(req, body) + } +} diff --git a/internal/proxy/proxy.go b/internal/proxy/proxy.go index 5a50267..05e06d5 100644 --- a/internal/proxy/proxy.go +++ b/internal/proxy/proxy.go @@ -4,93 +4,107 @@ import ( "bytes" "context" "fmt" - "io" "io/ioutil" "log" "net/http" - "net/http/httputil" "net/url" "strings" + "sync" "time" - "github.com/rb3ckers/trafficmirror/datatypes" "github.com/rb3ckers/trafficmirror/internal/config" - "github.com/sony/gobreaker" + "github.com/rb3ckers/trafficmirror/internal/mirror" ) -var netClient = &http.Client{ - Timeout: time.Second * 20, +type Proxy struct { + cfg *config.Config + reflector *mirror.Reflector + waitGroup *sync.WaitGroup + httpServer *http.Server } -var targets *datatypes.MirrorTargets +func NewProxy(cfg *config.Config) *Proxy { + p := &Proxy{ + cfg: cfg, + reflector: mirror.NewReflector(cfg), + } -func Start(ctx context.Context, cfg *config.Config) error { - targets = datatypes.NewMirrorTargets(datatypes.MirrorSettings{ - PersistentFailureTimeout: time.Duration(cfg.PersistentFailureTimeout) * time.Minute, - RetryAfter: time.Duration(cfg.RetryAfter) * time.Minute, - }) + p.reflector.AddMirrors(cfg.Mirrors) - url, _ := url.Parse(cfg.MainProxyTarget) + go p.reflector.Reflect() - mirrorMux := http.NewServeMux() + return p +} - var targetsMux *http.ServeMux +func (p *Proxy) Start(ctx context.Context) error { + p.waitGroup = &sync.WaitGroup{} + p.waitGroup.Add(1) - if cfg.TargetsListenAddress != "" { - targetsMux = http.NewServeMux() - } else { - targetsMux = mirrorMux - } + url, _ := url.Parse(p.cfg.MainProxyTarget) + mirrorMux := http.NewServeMux() + p.httpServer = &http.Server{Addr: p.cfg.ListenAddress, Handler: mirrorMux} - proxyTo := httputil.NewSingleHostReverseProxy(url) + targetsMux := mirrorMux + targetsServer := p.httpServer - if cfg.PasswordFile != "" { - username, password, err := parseUsernamePassword(cfg.PasswordFile) - if err != nil { - return err - } + if p.cfg.TargetsListenAddress != "" { + targetsMux = http.NewServeMux() + targetsServer = &http.Server{Addr: p.cfg.TargetsListenAddress, Handler: targetsMux} - targetsMux.HandleFunc("/"+cfg.TargetsEndpoint, BasicAuth(mirrorsHandler, username, password, "Please provide username and password for changing mirror targets")) - } else { - targetsMux.HandleFunc("/"+cfg.TargetsEndpoint, mirrorsHandler) + p.waitGroup.Add(1) } - mirrorMux.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) { - body := bufferRequest(req) - - // Update the headers to allow for SSL redirection - req.URL.Host = url.Host - req.URL.Scheme = url.Scheme - req.Host = url.Host + if err := p.setupTargetsMux(targetsMux); err != nil { + return err + } - proxyTo.ServeHTTP(res, req) - go sendToMirrors(req, body) - }) + mirrorMux.HandleFunc("/", ReverseProxyHandler(p.reflector, url)) // start configuration server if needed - if cfg.TargetsListenAddress != "" { - go func() { - if err := http.ListenAndServe(cfg.TargetsListenAddress, targetsMux); err != nil { - panic(err) + if p.cfg.TargetsListenAddress != "" { + p.httpServer.RegisterOnShutdown(func() { + if err := targetsServer.Shutdown(context.Background()); err != nil { //nolint:staticcheck + // Already in shutdown mode, ignore error } - }() + }) + + startHTTPServer(p.waitGroup, targetsServer) } // start mirror server - if err := http.ListenAndServe(cfg.ListenAddress, mirrorMux); err != nil { - panic(err) + startHTTPServer(p.waitGroup, p.httpServer) + + return nil +} + +func startHTTPServer(wg *sync.WaitGroup, srv *http.Server) { + go func() { + defer wg.Done() + // always returns error. ErrServerClosed on graceful close + if err := srv.ListenAndServe(); err != http.ErrServerClosed { + // unexpected error. port in use? + log.Printf("Unexpected error running server: %v", err) + } + }() +} + +func (p *Proxy) Stop() error { + if err := p.httpServer.Shutdown(context.TODO()); err != nil { + panic(err) // failure/timeout shutting down the server gracefully } + p.reflector.Close() + return nil } -func mirrorsHandler(res http.ResponseWriter, req *http.Request) { +func (p *Proxy) mirrorsHandler(res http.ResponseWriter, req *http.Request) { if req.Method == http.MethodGet { - for _, target := range targets.ListTargets() { - if target.State == "alive" { - fmt.Fprintf(res, "%s: %s\n", target.Name, target.State) + for _, target := range p.reflector.ListMirrors() { + if target.State == mirror.StateAlive { + fmt.Fprintf(res, "%s: %s\n", target.URL, target.State) } else { - fmt.Fprintf(res, "%s: %s (since: %s)\n", target.Name, target.State, target.FailingSince.UTC().Format(time.RFC3339)) + fmt.Fprintf(res, "%s: %s (since: %s)\n", target.URL, target.State, target.FailingSince.UTC().Format(time.RFC3339)) } } @@ -107,36 +121,12 @@ func mirrorsHandler(res http.ResponseWriter, req *http.Request) { } if req.Method == http.MethodPut { - targets.Add(targetURLs) + p.reflector.AddMirrors(targetURLs) } else if req.Method == http.MethodDelete { - targets.Delete(targetURLs) + p.reflector.RemoveMirrors(targetURLs) } } -func sendToMirrors(req *http.Request, body []byte) { - targets.ForEach(func(target string, breaker *gobreaker.CircuitBreaker) { - go mirrorTo(target, req, body, breaker) - }) -} - -func mirrorTo(targetURL string, req *http.Request, body []byte, breaker *gobreaker.CircuitBreaker) { - breaker.Execute(func() (interface{}, error) { //nolint:errcheck - url := fmt.Sprintf("%s%s", targetURL, req.RequestURI) - - newRequest, _ := http.NewRequest(req.Method, url, bytes.NewReader(body)) //nolint:noctx - newRequest.Header = req.Header - - response, err := netClient.Do(newRequest) - if err != nil { - log.Printf("Error reading response: %v", err) - return nil, err - } - defer response.Body.Close() - // Drain the body, but discard it, to make sure connection can be reused - return io.Copy(ioutil.Discard, response.Body) - }) -} - func parseUsernamePassword(passwordFile string) (string, string, error) { data, err := ioutil.ReadFile(passwordFile) if err != nil { @@ -163,3 +153,18 @@ func bufferRequest(req *http.Request) []byte { return body } + +func (p *Proxy) setupTargetsMux(targetsMux *http.ServeMux) error { + if p.cfg.PasswordFile != "" { + username, password, err := parseUsernamePassword(p.cfg.PasswordFile) + if err != nil { + return err + } + + targetsMux.HandleFunc("/"+p.cfg.TargetsEndpoint, BasicAuth(p.mirrorsHandler, username, password, "Please provide username and password for changing mirror targets")) + } else { + targetsMux.HandleFunc("/"+p.cfg.TargetsEndpoint, p.mirrorsHandler) + } + + return nil +} From 8636a6360695204ee563a5137bc56ef0f7026290 Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Fri, 27 Aug 2021 12:55:31 +0200 Subject: [PATCH 4/8] Add test for proxy Signed-off-by: Jeroen van Erp --- internal/mirror/mirror.go | 6 +++- internal/proxy/proxy_test.go | 57 ++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+), 1 deletion(-) create mode 100644 internal/proxy/proxy_test.go diff --git a/internal/mirror/mirror.go b/internal/mirror/mirror.go index 28a5f3f..70b5922 100644 --- a/internal/mirror/mirror.go +++ b/internal/mirror/mirror.go @@ -96,7 +96,11 @@ func (m *Mirror) Reflect(req *Request) { m.breaker.Execute(func() (interface{}, error) { //nolint:errcheck url := fmt.Sprintf("%s%s", m.targetURL, req.originalRequest.RequestURI) - newRequest, _ := http.NewRequest(req.originalRequest.Method, url, bytes.NewReader(req.body)) //nolint:noctx + newRequest, err := http.NewRequest(req.originalRequest.Method, url, bytes.NewReader(req.body)) //nolint:noctx + if err != nil { + return nil, err + } + newRequest.Header = req.originalRequest.Header response, err := m.netClient.Do(newRequest) diff --git a/internal/proxy/proxy_test.go b/internal/proxy/proxy_test.go new file mode 100644 index 0000000..51622ef --- /dev/null +++ b/internal/proxy/proxy_test.go @@ -0,0 +1,57 @@ +package proxy + +import ( + "context" + "net/http" + "sync" + "testing" + "time" + + "github.com/gin-gonic/gin" + "github.com/rb3ckers/trafficmirror/internal/config" + "github.com/stretchr/testify/assert" +) + +func TestReflector(t *testing.T) { + reqs1, reqs2 := 0, 0 + wg := &sync.WaitGroup{} + wg.Add(2) + serv1 := gin.New() + serv2 := gin.New() + + serv1.GET("/", func(c *gin.Context) { + reqs1++ + wg.Done() + c.String(200, "Hello World") + }) + + serv2.GET("/", func(c *gin.Context) { + reqs2++ + wg.Done() + c.String(200, "Hello World") + }) + + go gin.Default().Run(":8888") + go serv1.Run(":8081") + go serv2.Run(":8082") + + p := NewProxy(config.Default()) + assert.NoError(t, p.Start(context.Background())) + p.reflector.AddMirrors([]string{"http://localhost:8081", "http://localhost:8082"}) + + req, err := http.NewRequest("GET", "http://localhost:8080/", nil) + assert.NoError(t, err) + + c := &http.Client{ + Timeout: time.Second * 20, + } + + resp, err := c.Do(req) + assert.NoError(t, err) + resp.Body.Close() + + wg.Wait() + + assert.Equal(t, 1, reqs1) + assert.Equal(t, 1, reqs2) +} From f080342799f4faac8d5f34054a2670233b11bfe0 Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Mon, 30 Aug 2021 16:37:44 +0200 Subject: [PATCH 5/8] Use very simple Docker container so that we can configure everything through Helm --- .goreleaser.yml | 30 ++++++++++++++---------------- Dockerfile.goreleaser | 6 ++++++ 2 files changed, 20 insertions(+), 16 deletions(-) create mode 100644 Dockerfile.goreleaser diff --git a/.goreleaser.yml b/.goreleaser.yml index 8669415..d592cf0 100644 --- a/.goreleaser.yml +++ b/.goreleaser.yml @@ -27,19 +27,17 @@ changelog: - "^docs:" - "^test:" dockers: -- extra_files: - - datatypes/ - - go.mod - - go.sum - - main.go - - rootfs/ - build_flag_templates: - - "--label=org.opencontainers.image.created={{.Date}}" - - "--label=org.opencontainers.image.title={{.ProjectName}}" - - "--label=org.opencontainers.image.revision={{.FullCommit}}" - - "--label=org.opencontainers.image.version={{.Version}}" - image_templates: - - docker.io/stackstate/trafficmirror:latest - - docker.io/stackstate/trafficmirror:{{ .Tag }} - - docker.io/stackstate/trafficmirror:v{{ .Major }} - - docker.io/stackstate/trafficmirror:v{{ .Major }}.{{ .Minor }} + - + goos: linux + goarch: amd64 + dockerfile: Dockerfile.goreleaser + build_flag_templates: + - "--label=org.opencontainers.image.created={{.Date}}" + - "--label=org.opencontainers.image.title={{.ProjectName}}" + - "--label=org.opencontainers.image.revision={{.FullCommit}}" + - "--label=org.opencontainers.image.version={{.Version}}" + image_templates: + - docker.io/stackstate/trafficmirror:latest + - docker.io/stackstate/trafficmirror:{{ .Tag }} + - docker.io/stackstate/trafficmirror:v{{ .Major }} + - docker.io/stackstate/trafficmirror:v{{ .Major }}.{{ .Minor }} diff --git a/Dockerfile.goreleaser b/Dockerfile.goreleaser new file mode 100644 index 0000000..9cfa92d --- /dev/null +++ b/Dockerfile.goreleaser @@ -0,0 +1,6 @@ +FROM gcr.io/distroless/static:nonroot +WORKDIR / +COPY trafficmirror . +USER nonroot:nonroot + +ENTRYPOINT ["/trafficmirror"] From a523e5d8cd3244d254ab0afafcb387079debb5ee Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Mon, 30 Aug 2021 16:51:04 +0200 Subject: [PATCH 6/8] Use Quay instead of dockerhub --- .goreleaser.yml | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/.goreleaser.yml b/.goreleaser.yml index d592cf0..b9a569b 100644 --- a/.goreleaser.yml +++ b/.goreleaser.yml @@ -37,7 +37,7 @@ dockers: - "--label=org.opencontainers.image.revision={{.FullCommit}}" - "--label=org.opencontainers.image.version={{.Version}}" image_templates: - - docker.io/stackstate/trafficmirror:latest - - docker.io/stackstate/trafficmirror:{{ .Tag }} - - docker.io/stackstate/trafficmirror:v{{ .Major }} - - docker.io/stackstate/trafficmirror:v{{ .Major }}.{{ .Minor }} + - quay.io/stackstate/trafficmirror:latest + - quay.io/stackstate/trafficmirror:{{ .Tag }} + - quay.io/stackstate/trafficmirror:v{{ .Major }} + - quay.io/stackstate/trafficmirror:v{{ .Major }}.{{ .Minor }} From 68699cf2023fcd3e03654f4c7d8d5025d23da621 Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Mon, 30 Aug 2021 16:59:17 +0200 Subject: [PATCH 7/8] Use separate config flags for username/password --- cmd/root.go | 4 +++- internal/config/config.go | 4 +++- internal/proxy/proxy.go | 12 +++++++++++- 3 files changed, 17 insertions(+), 3 deletions(-) diff --git a/cmd/root.go b/cmd/root.go index f9804b5..e8a09f3 100644 --- a/cmd/root.go +++ b/cmd/root.go @@ -68,7 +68,9 @@ Additional targets are configured via PUT/DELETE on the '/targets?url= cmd.Flags().StringP("main", "m", "http://localhost:8888", "Main proxy target, its responses will be returned to the client") cmd.Flags().String("targets", "targets", "Path on which additional targets to mirror to can be added/deleted/listed via PUT, DELETE and GET") cmd.Flags().String("targets-address", "", "Address on which the targets endpoint is made available. Leave empty to expose it on the address that is being mirrored") - cmd.Flags().String("password", "", "Provide a file that contains username/password to protect the configuration 'targets' endpoint. Contains 1 username/password combination separated by ':'.") + cmd.Flags().String("username", "", "Username to protect the configuration 'targets' endpoint with.") + cmd.Flags().String("password", "", "Password to protect the configuration 'targets' endpoint with.") + cmd.Flags().String("passwordFile", "", "Provide a file that contains username/password to protect the configuration 'targets' endpoint. Contains 1 username/password combination separated by ':'.") cmd.Flags().Int("fail-after", 30, "Remove a target when it has been failing for this many minutes.") //nolint:gomnd cmd.Flags().Int("retry-after", 1, "After 5 successive failures a target is temporarily disabled, it will be retried after this many minutes.") cmd.Flags().StringSlice("mirror", []string{}, "Mirror traffic to additional targets") diff --git a/internal/config/config.go b/internal/config/config.go index d74951f..5c37df0 100644 --- a/internal/config/config.go +++ b/internal/config/config.go @@ -9,7 +9,9 @@ type Config struct { ListenAddress string `yaml:"listen" default:":8080"` TargetsEndpoint string `yaml:"targets" default:"targets"` TargetsListenAddress string `yaml:"targets-address"` - PasswordFile string `yaml:"password"` + Username string `yaml:"username"` + Password string `yaml:"password"` + PasswordFile string `yaml:"passwordFile"` PersistentFailureTimeout int `yaml:"fail-after" default:"30"` RetryAfter int `yaml:"retry-after" default:"1"` Mirrors []string `yaml:"mirror"` diff --git a/internal/proxy/proxy.go b/internal/proxy/proxy.go index 05e06d5..3da250e 100644 --- a/internal/proxy/proxy.go +++ b/internal/proxy/proxy.go @@ -155,12 +155,22 @@ func bufferRequest(req *http.Request) []byte { } func (p *Proxy) setupTargetsMux(targetsMux *http.ServeMux) error { + var username, password string + if p.cfg.PasswordFile != "" { - username, password, err := parseUsernamePassword(p.cfg.PasswordFile) + u, pwd, err := parseUsernamePassword(p.cfg.PasswordFile) if err != nil { return err } + username = u + password = pwd + } else if p.cfg.Username != "" && p.cfg.Password != "" { + username = p.cfg.Username + password = p.cfg.Password + } + + if username != "" && password != "" { targetsMux.HandleFunc("/"+p.cfg.TargetsEndpoint, BasicAuth(p.mirrorsHandler, username, password, "Please provide username and password for changing mirror targets")) } else { targetsMux.HandleFunc("/"+p.cfg.TargetsEndpoint, p.mirrorsHandler) From 4e1203af86933064f082dd9505dc3035250076f0 Mon Sep 17 00:00:00 2001 From: Jeroen van Erp Date: Mon, 30 Aug 2021 18:41:14 +0200 Subject: [PATCH 8/8] Incorporate review comment --- cmd/root.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/cmd/root.go b/cmd/root.go index e8a09f3..66ac36f 100644 --- a/cmd/root.go +++ b/cmd/root.go @@ -73,7 +73,7 @@ Additional targets are configured via PUT/DELETE on the '/targets?url= cmd.Flags().String("passwordFile", "", "Provide a file that contains username/password to protect the configuration 'targets' endpoint. Contains 1 username/password combination separated by ':'.") cmd.Flags().Int("fail-after", 30, "Remove a target when it has been failing for this many minutes.") //nolint:gomnd cmd.Flags().Int("retry-after", 1, "After 5 successive failures a target is temporarily disabled, it will be retried after this many minutes.") - cmd.Flags().StringSlice("mirror", []string{}, "Mirror traffic to additional targets") + cmd.Flags().StringSlice("mirror", []string{}, "Start with mirroring traffic to provided targets") return cmd }