diff --git a/LICENSE b/LICENSE index f288702..261eeb9 100644 --- a/LICENSE +++ b/LICENSE @@ -1,674 +1,201 @@ - GNU GENERAL PUBLIC LICENSE - Version 3, 29 June 2007 - - Copyright (C) 2007 Free Software Foundation, Inc. - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. - - Preamble - - The GNU General Public License is a free, copyleft license for -software and other kinds of works. - - The licenses for most software and other practical works are designed -to take away your freedom to share and change the works. By contrast, -the GNU General Public License is intended to guarantee your freedom to -share and change all versions of a program--to make sure it remains free -software for all its users. We, the Free Software Foundation, use the -GNU General Public License for most of our software; it applies also to -any other work released this way by its authors. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..2994276 --- /dev/null +++ b/README.md @@ -0,0 +1,142 @@ +# Gitlab Logger +This allows to disable tail based Gitlab logging (by providing a no-op tail) and instead use a sidecar logger agent that tail files and output (semi-)structured logs (JSON) on stdout or, eventually, use it as a tail dropin replacement. + +Contribution is more than welcomed! + +[![GitHub license](https://img.shields.io/github/license/jbguerraz/gitlab-logger.svg?c)](https://github.com/jbguerraz/gitlab-logger/blob/master/LICENSE) +[![GoDoc](https://godoc.org/github.com/jbguerraz/gitlab-logger?status.svg)](https://pkg.go.dev/github.com/jbguerraz/gitlab-logger?tab=doc) +[![Go Report Card](https://goreportcard.com/badge/github.com/jbguerraz/gitlab-logger)](https://goreportcard.com/report/github.com/jbguerraz/gitlab-logger) +[![GitHub issues](https://img.shields.io/github/issues/jbguerraz/gitlab-logger.svg)](https://github.com/jbguerraz/gitlab-logger/issues) + +## Configuration +Configuration is flag based. When used as a tail dropin replacement, use a wrapper script if you want to to configure it: + +for example, in /usr/local/bin/tail +``` +#!/usr/bin/env sh +exec /usr/local/bin/gitlab-logger --poll=true --exclude="sasl|config|lock|@|gzip|tgz|gz|production.log" --minlevel=3 $@ +``` + +### poll +Set it to true to use polling instead of inotify for directory watching (used when a directory is passed in the list of files to tail. e.g: /var/log/gitlab) +#### default +`false` +### json +Set it to true to keep only (json) structured event logs +#### default +`false` +### minlevel +Minimum log level, used to filter out logs: +- 1 debug +- 2 info +- 3 notice +- 4 warn +- 5 err +- 6 fatal +- 100 unknown (level is keyword detection based. some won't match) +#### default +`0` +### exclude +blacklist files based on their full path (used when watching a directory). list of keywords, using a pipe (`|`) as separator. +#### default +`sasl|config|lock|@|gzip|tgz|gz` + +## How to give it a try +### Sidecar +`docker-compose -f docker-compose.sidecar.yml build && docker-compose -f docker-compose.sidecar.yml up -d && docker logs -f gitlab-logger_web_1` + +### Tail dropin replacement +`docker-compose -f docker-compose.dropin.yml build && docker-compose -f docker-compose.dropin.yml up -d && docker logs -f gitlab-logger_web_1` + +## Example output +``` +$ docker logs -f gitlab-logger_logger_1 | jq +{ + "date": "2020-05-22T00:47:17Z", + "component": "gitaly", + "subcomponent": "current", + "level": "error", + "file": "/var/log/gitlab/gitaly/current", + "message": { + "error": "open /var/opt/gitlab/gitaly/gitaly.pid: no such file or directory", + "level": "error", + "msg": "find gitaly", + "time": "2020-05-22T00:47:17Z", + "wrapper": 466 + } +} +{ + "date": "2020-05-22T00:47:17Z", + "component": "gitaly", + "subcomponent": "current", + "level": "warning", + "file": "/var/log/gitlab/gitaly/current", + "message": "time=\"2020-05-22T00:47:17Z\" level=warning msg=\"git path not configured. Using default path resolution\" resolvedPath=/opt/gitlab/embedded/bin/git" +} +{ + "date": "2020-05-22T00:47:18Z", + "component": "gitaly", + "subcomponent": "current", + "level": "warning", + "file": "/var/log/gitlab/gitaly/current", + "message": { + "level": "warning", + "msg": "spawned", + "supervisor.args": [ + "bundle", + "exec", + "bin/ruby-cd", + "/var/opt/gitlab/gitaly", + "/opt/gitlab/embedded/service/gitaly-ruby/bin/gitaly-ruby", + "479", + "/var/opt/gitlab/gitaly/internal_sockets/ruby.0" + ], + "supervisor.name": "gitaly-ruby.0", + "supervisor.pid": 498, + "time": "2020-05-22T00:47:17.676Z" + } +} +{ + "date": "2020-05-22T00:47:18Z", + "component": "gitaly", + "subcomponent": "current", + "level": "warning", + "file": "/var/log/gitlab/gitaly/current", + "message": { + "level": "warning", + "msg": "spawned", + "supervisor.args": [ + "bundle", + "exec", + "bin/ruby-cd", + "/var/opt/gitlab/gitaly", + "/opt/gitlab/embedded/service/gitaly-ruby/bin/gitaly-ruby", + "479", + "/var/opt/gitlab/gitaly/internal_sockets/ruby.1" + ], + "supervisor.name": "gitaly-ruby.1", + "supervisor.pid": 500, + "time": "2020-05-22T00:47:17.676Z" + } +} +{ + "date": "2020-05-22T00:47:42Z", + "component": "gitlab-rails", + "subcomponent": "gitlab-rails-db-migrate-2020-05-22-00-47-26", + "level": "notice", + "file": "/var/log/gitlab/gitlab-rails/gitlab-rails-db-migrate-2020-05-22-00-47-26.log", + "message": "psql:/opt/gitlab/embedded/service/gitlab-rails/db/structure.sql:3: NOTICE: extension \"plpgsql\" already exists, skipping" +} +{ + "date": "2020-05-22T00:47:42Z", + "component": "gitlab-rails", + "subcomponent": "gitlab-rails-db-migrate-2020-05-22-00-47-26", + "level": "notice", + "file": "/var/log/gitlab/gitlab-rails/gitlab-rails-db-migrate-2020-05-22-00-47-26.log", + "message": "psql:/opt/gitlab/embedded/service/gitlab-rails/db/structure.sql:5: NOTICE: extension \"pg_trgm\" already exists, skipping" +} +``` + +## Watch it + +[![asciicast](https://asciinema.org/a/lx8RDAWAAaMFXZNbiaseBRkDL.svg)](https://asciinema.org/a/lx8RDAWAAaMFXZNbiaseBRkDL) diff --git a/docker-compose.dropin.yml b/docker-compose.dropin.yml new file mode 100644 index 0000000..056c08f --- /dev/null +++ b/docker-compose.dropin.yml @@ -0,0 +1,16 @@ +version: '3.3' + +services: + web: + build: + dockerfile: ./images/gitlab/Dockerfile.dropin + context: . + restart: always + hostname: 'localhost' + environment: + GITLAB_OMNIBUS_CONFIG: | + external_url 'https://localhost' + ports: + - '80:80' + - '443:443' + - '22:22' diff --git a/docker-compose.sidecar.yml b/docker-compose.sidecar.yml new file mode 100644 index 0000000..deed020 --- /dev/null +++ b/docker-compose.sidecar.yml @@ -0,0 +1,27 @@ +version: '3.3' + +services: + logger: + build: + dockerfile: ./images/gitlab-logger/Dockerfile + context: . + restart: always + volumes: + - logs:/var/log/gitlab + web: + build: + dockerfile: ./images/gitlab/Dockerfile.sidecar + context: . + restart: always + hostname: 'localhost' + environment: + GITLAB_OMNIBUS_CONFIG: | + external_url 'https://localhost' + ports: + - '80:80' + - '443:443' + - '22:22' + volumes: + - logs:/var/log/gitlab +volumes: + logs: {} diff --git a/images/gitlab-logger/Dockerfile b/images/gitlab-logger/Dockerfile new file mode 100644 index 0000000..3e5006f --- /dev/null +++ b/images/gitlab-logger/Dockerfile @@ -0,0 +1,15 @@ +FROM golang:alpine as builder +COPY main.go /tmp/gitlab-logger/main.go +ENV CGO_ENABLED=0 +RUN apk add --no-cache git \ + && cd /tmp/gitlab-logger \ + && export GOPATH=/tmp/gitlab-logger \ + && export GOBIN=/usr/bin \ + && git config --global http.https://gopkg.in.followRedirects true \ + && go get \ + && go build . + +FROM scratch +COPY --from=builder /tmp/gitlab-logger/gitlab-logger / +ENTRYPOINT ["/gitlab-logger"] +CMD ["--poll=false", "--json=false", "--minlevel=0", "--exclude=sasl|config|lock|@|gzip|tgz|gz|production.log", "/var/log/gitlab"] diff --git a/images/gitlab/Dockerfile.dropin b/images/gitlab/Dockerfile.dropin new file mode 100644 index 0000000..3025a38 --- /dev/null +++ b/images/gitlab/Dockerfile.dropin @@ -0,0 +1,14 @@ +FROM golang:alpine as builder +COPY main.go /tmp/gitlab-logger/main.go +ENV CGO_ENABLED=0 +RUN apk add --no-cache git \ + && cd /tmp/gitlab-logger \ + && export GOPATH=/tmp/gitlab-logger \ + && export GOBIN=/usr/bin \ + && git config --global http.https://gopkg.in.followRedirects true \ + && go get \ + && go build . + +FROM gitlab/gitlab-ce:latest +COPY --from=builder /tmp/gitlab-logger/gitlab-logger /usr/local/bin/gitlab-logger +COPY scripts/tail.dropin /usr/local/bin/tail diff --git a/images/gitlab/Dockerfile.sidecar b/images/gitlab/Dockerfile.sidecar new file mode 100644 index 0000000..88ef770 --- /dev/null +++ b/images/gitlab/Dockerfile.sidecar @@ -0,0 +1,2 @@ +FROM gitlab/gitlab-ce:latest +COPY scripts/tail.sidecar /usr/local/bin/tail diff --git a/main.go b/main.go new file mode 100644 index 0000000..a838d37 --- /dev/null +++ b/main.go @@ -0,0 +1,246 @@ +package main + +import ( + "flag" + "fmt" + "io" + "io/ioutil" + "os" + "path/filepath" + "runtime" + "strconv" + "strings" + "sync" + "time" + + tailer "github.com/nxadm/tail" + "github.com/radovskyb/watcher" +) + +const ( + fileMode = iota + directoryMode + start + stop +) + +var ( + tails sync.Map + poll bool + exclude []string + json bool + minLevel int +) + +type tailEvent struct { + Op int + File string +} + +func init() { + fs := flag.NewFlagSet("config", flag.ContinueOnError) + fs.BoolVar(&poll, "poll", false, "Use polling instead of inotify") + fs.BoolVar(&json, "json", false, "Keep only JSON logs") + fs.IntVar(&minLevel, "minlevel", 0, "Minimum log level") + e := fs.String("exclude", "sasl|config|lock|@|gzip|tgz|gz", "blacklist (sep. by |): excludes any file containing any of those words in their fullpath.") + fs.SetOutput(ioutil.Discard) + fs.Parse(os.Args[1:]) + exclude = strings.Split(*e, "|") +} + +func main() { + c := make(chan *tailEvent) + ff := filesFromArgs() + go tail(c) + if v, ok := ff[directoryMode]; ok { + go watch(v, c) + } + for _, f := range ff[fileMode] { + c <- &tailEvent{Op: start, File: f} + } + runtime.Goexit() +} + +func watchFilter(info os.FileInfo, fullPath string) error { + if info.IsDir() { + return watcher.ErrSkip + } + for _, w := range exclude { + if strings.Contains(fullPath, w) { + return watcher.ErrSkip + } + } + return nil +} + +func watch(dirs []string, c chan *tailEvent) { + w := watcher.New() + w.AddFilterHook(watchFilter) + w.FilterOps(watcher.Create, watcher.Write, watcher.Remove) + go func() { + for { + select { + case event := <-w.Event: + switch event.Op { + case watcher.Create, watcher.Write: + _, ok := tails.Load(event.Path) + if !ok { + c <- &tailEvent{Op: start, File: event.Path} + } + case watcher.Remove: + c <- &tailEvent{Op: stop, File: event.Path} + default: + panic(nil) + } + case err := <-w.Error: + panic(err) + case <-w.Closed: + return + } + } + }() + for _, d := range dirs { + if err := w.AddRecursive(d); err != nil { + panic(err) + } + } + if err := w.Start(time.Millisecond * 100); err != nil { + panic(err) + } +} + +func tail(c chan *tailEvent) { + for evt := range c { + switch evt.Op { + case start: + go func() { + t, err := tailer.TailFile(evt.File, tailer.Config{Poll: poll, Follow: true, ReOpen: true, Location: &tailer.SeekInfo{Whence: io.SeekEnd}, Logger: tailer.DiscardingLogger}) + if err != nil { + panic(err) + } + tails.Store(evt.File, t) + for line := range t.Lines { + log(t.Filename, line.Text) + } + }() + case stop: + v, ok := tails.Load(evt.File) + if ok { + v.(*tailer.Tail).Stop() + tails.Delete(evt.File) + } + default: + panic(nil) + } + } +} + +func filesFromArgs() map[int][]string { + var filePerMode map[int][]string = make(map[int][]string) + for _, f := range os.Args[1:] { + if strings.HasPrefix(f, "/") { + mode := fileMode + if isDir(f) { + mode = directoryMode + } + filePerMode[mode] = append(filePerMode[mode], f) + } + } + return filePerMode +} + +func isDir(path string) bool { + s, err := os.Stat(path) + if err != nil { + return false + } + return s.IsDir() +} + +func log(file, message string) { + if len(message) == 0 { + return + } + j := isJson(message) + if json && !j { + return + } + level, label := detectLevel(message) + if level < minLevel { + return + } + if !j { + message = strconv.Quote(message) + } + date := time.Now().Format(time.RFC3339) + component, subcomponent := components(file) + fmt.Printf("{\"date\":\"%s\",\"component\": \"%s\",\"subcomponent\":\"%s\",\"level\":\"%s\",\"file\":%q,\"message\":%s}\n", date, component, subcomponent, label, file, message) +} + +func detectLevel(message string) (int, string) { + level := 100 + label := "unknown" + message = strings.ToLower(message) + debug := []string{"debug"} + info := []string{"info", "log", "get", "post", "processing", "starting", "started", "completed", "success", "saving", "saved", "creating", "created"} + notice := []string{"notice"} + warn := []string{"warn"} + err := []string{"error", "failed"} + fatal := []string{"fatal", "emerg"} + for _, w := range debug { + if strings.Contains(message, w) { + level = 1 + label = "debug" + break + } + } + for _, w := range info { + if strings.Contains(message, w) { + level = 2 + label = "info" + break + } + } + for _, w := range notice { + if strings.Contains(message, w) { + level = 3 + label = "notice" + break + } + } + for _, w := range warn { + if strings.Contains(message, w) { + level = 4 + label = "warning" + break + } + } + for _, w := range err { + if strings.Contains(message, w) { + level = 5 + label = "error" + break + } + } + for _, w := range fatal { + if strings.Contains(message, w) { + level = 6 + label = "fatal" + break + } + } + return level, label +} + +func components(file string) (string, string) { + parts := strings.Split(file, "/") + component := parts[len(parts)-2:][0] + subcomponent := parts[len(parts)-1:][0] + subcomponent = strings.TrimSuffix(subcomponent, filepath.Ext(subcomponent)) + return component, subcomponent +} + +func isJson(s string) bool { + //cheap detection; must be good / fastest for such logs parsing + return s[:1] == "{" && s[len(s)-1:] == "}" +} diff --git a/scripts/tail.dropin b/scripts/tail.dropin new file mode 100755 index 0000000..f242e0d --- /dev/null +++ b/scripts/tail.dropin @@ -0,0 +1,4 @@ +#!/usr/bin/env sh +#uncomment next line to preserve original logging +#exec /usr/bin/tail $@ +exec /usr/local/bin/gitlab-logger --poll=true --exclude="sasl|config|lock|@|gzip|tgz|gz|production.log" --minlevel=3 $@ diff --git a/scripts/tail.sidecar b/scripts/tail.sidecar new file mode 100755 index 0000000..f071b5a --- /dev/null +++ b/scripts/tail.sidecar @@ -0,0 +1,4 @@ +#!/usr/bin/env sh +echo "logs available from gitlab-logger container" +#uncomment next line to preserve original logging +#exec /usr/bin/tail $@