gitlab-org--gitlab-foss/workhorse/main.go

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package main
import (
"flag"
"fmt"
"io/ioutil"
"net"
"net/http"
_ "net/http/pprof"
"os"
"syscall"
"time"
"gitlab.com/gitlab-org/labkit/log"
"gitlab.com/gitlab-org/labkit/monitoring"
"gitlab.com/gitlab-org/labkit/tracing"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/queueing"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/redis"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/secret"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/upstream"
)
// Version is the current version of GitLab Workhorse
var Version = "(unknown version)" // Set at build time in the Makefile
// BuildTime signifies the time the binary was build
var BuildTime = "19700101.000000" // Set at build time in the Makefile
type bootConfig struct {
secretPath string
listenAddr string
listenNetwork string
listenUmask int
pprofListenAddr string
prometheusListenAddr string
logFile string
logFormat string
printVersion bool
}
func main() {
boot, cfg, err := buildConfig(os.Args[0], os.Args[1:])
if err == (alreadyPrintedError{flag.ErrHelp}) {
os.Exit(0)
}
if err != nil {
if _, alreadyPrinted := err.(alreadyPrintedError); !alreadyPrinted {
fmt.Fprintln(os.Stderr, err)
}
os.Exit(2)
}
if boot.printVersion {
fmt.Printf("gitlab-workhorse %s-%s\n", Version, BuildTime)
os.Exit(0)
}
log.WithError(run(*boot, *cfg)).Fatal("shutting down")
}
type alreadyPrintedError struct{ error }
// buildConfig may print messages to os.Stderr if err != nil. If err is
// of type alreadyPrintedError it has already been printed.
func buildConfig(arg0 string, args []string) (*bootConfig, *config.Config, error) {
boot := &bootConfig{}
cfg := &config.Config{Version: Version}
fset := flag.NewFlagSet(arg0, flag.ContinueOnError)
fset.Usage = func() {
fmt.Fprintf(fset.Output(), "Usage of %s:\n", arg0)
fmt.Fprintf(fset.Output(), "\n %s [OPTIONS]\n\nOptions:\n", arg0)
fset.PrintDefaults()
}
configFile := fset.String("config", "", "TOML file to load config from")
fset.StringVar(&boot.secretPath, "secretPath", "./.gitlab_workhorse_secret", "File with secret key to authenticate with authBackend")
fset.StringVar(&boot.listenAddr, "listenAddr", "localhost:8181", "Listen address for HTTP server")
fset.StringVar(&boot.listenNetwork, "listenNetwork", "tcp", "Listen 'network' (tcp, tcp4, tcp6, unix)")
fset.IntVar(&boot.listenUmask, "listenUmask", 0, "Umask for Unix socket")
fset.StringVar(&boot.pprofListenAddr, "pprofListenAddr", "", "pprof listening address, e.g. 'localhost:6060'")
fset.StringVar(&boot.prometheusListenAddr, "prometheusListenAddr", "", "Prometheus listening address, e.g. 'localhost:9229'")
fset.StringVar(&boot.logFile, "logFile", "", "Log file location")
fset.StringVar(&boot.logFormat, "logFormat", "text", "Log format to use defaults to text (text, json, structured, none)")
fset.BoolVar(&boot.printVersion, "version", false, "Print version and exit")
// gitlab-rails backend
authBackend := fset.String("authBackend", upstream.DefaultBackend.String(), "Authentication/authorization backend")
fset.StringVar(&cfg.Socket, "authSocket", "", "Optional: Unix domain socket to dial authBackend at")
// actioncable backend
cableBackend := fset.String("cableBackend", upstream.DefaultBackend.String(), "ActionCable backend")
fset.StringVar(&cfg.CableSocket, "cableSocket", "", "Optional: Unix domain socket to dial cableBackend at")
fset.StringVar(&cfg.DocumentRoot, "documentRoot", "public", "Path to static files content")
fset.DurationVar(&cfg.ProxyHeadersTimeout, "proxyHeadersTimeout", 5*time.Minute, "How long to wait for response headers when proxying the request")
fset.BoolVar(&cfg.DevelopmentMode, "developmentMode", false, "Allow the assets to be served from Rails app")
fset.UintVar(&cfg.APILimit, "apiLimit", 0, "Number of API requests allowed at single time")
fset.UintVar(&cfg.APIQueueLimit, "apiQueueLimit", 0, "Number of API requests allowed to be queued")
fset.DurationVar(&cfg.APIQueueTimeout, "apiQueueDuration", queueing.DefaultTimeout, "Maximum queueing duration of requests")
fset.DurationVar(&cfg.APICILongPollingDuration, "apiCiLongPollingDuration", 50, "Long polling duration for job requesting for runners (default 50s - enabled)")
fset.BoolVar(&cfg.PropagateCorrelationID, "propagateCorrelationID", false, "Reuse existing Correlation-ID from the incoming request header `X-Request-ID` if present")
if err := fset.Parse(args); err != nil {
return nil, nil, alreadyPrintedError{err}
}
if fset.NArg() > 0 {
err := alreadyPrintedError{fmt.Errorf("unexpected arguments: %v", fset.Args())}
fmt.Fprintln(fset.Output(), err)
fset.Usage()
return nil, nil, err
}
var err error
cfg.Backend, err = parseAuthBackend(*authBackend)
if err != nil {
return nil, nil, fmt.Errorf("authBackend: %v", err)
}
cfg.CableBackend, err = parseAuthBackend(*cableBackend)
if err != nil {
return nil, nil, fmt.Errorf("cableBackend: %v", err)
}
tomlData := ""
if *configFile != "" {
buf, err := ioutil.ReadFile(*configFile)
if err != nil {
return nil, nil, fmt.Errorf("configFile: %v", err)
}
tomlData = string(buf)
}
cfgFromFile, err := config.LoadConfig(tomlData)
if err != nil {
return nil, nil, fmt.Errorf("configFile: %v", err)
}
cfg.Redis = cfgFromFile.Redis
cfg.ObjectStorageCredentials = cfgFromFile.ObjectStorageCredentials
cfg.ImageResizerConfig = cfgFromFile.ImageResizerConfig
cfg.AltDocumentRoot = cfgFromFile.AltDocumentRoot
return boot, cfg, nil
}
// run() lets us use normal Go error handling; there is no log.Fatal in run().
func run(boot bootConfig, cfg config.Config) error {
closer, err := startLogging(boot.logFile, boot.logFormat)
if err != nil {
return err
}
defer closer.Close()
tracing.Initialize(tracing.WithServiceName("gitlab-workhorse"))
log.WithField("version", Version).WithField("build_time", BuildTime).Print("Starting")
// Good housekeeping for Unix sockets: unlink before binding
if boot.listenNetwork == "unix" {
if err := os.Remove(boot.listenAddr); err != nil && !os.IsNotExist(err) {
return err
}
}
// Change the umask only around net.Listen()
oldUmask := syscall.Umask(boot.listenUmask)
listener, err := net.Listen(boot.listenNetwork, boot.listenAddr)
syscall.Umask(oldUmask)
if err != nil {
return fmt.Errorf("main listener: %v", err)
}
finalErrors := make(chan error)
// The profiler will only be activated by HTTP requests. HTTP
// requests can only reach the profiler if we start a listener. So by
// having no profiler HTTP listener by default, the profiler is
// effectively disabled by default.
if boot.pprofListenAddr != "" {
l, err := net.Listen("tcp", boot.pprofListenAddr)
if err != nil {
return fmt.Errorf("pprofListenAddr: %v", err)
}
go func() { finalErrors <- http.Serve(l, nil) }()
}
monitoringOpts := []monitoring.Option{monitoring.WithBuildInformation(Version, BuildTime)}
if boot.prometheusListenAddr != "" {
l, err := net.Listen("tcp", boot.prometheusListenAddr)
if err != nil {
return fmt.Errorf("prometheusListenAddr: %v", err)
}
monitoringOpts = append(monitoringOpts, monitoring.WithListener(l))
}
go func() {
// Unlike http.Serve, which always returns a non-nil error,
// monitoring.Start may return nil in which case we should not shut down.
if err := monitoring.Start(monitoringOpts...); err != nil {
finalErrors <- err
}
}()
secret.SetPath(boot.secretPath)
if cfg.Redis != nil {
redis.Configure(cfg.Redis, redis.DefaultDialFunc)
go redis.Process()
}
if err := cfg.RegisterGoCloudURLOpeners(); err != nil {
return fmt.Errorf("register cloud credentials: %v", err)
}
accessLogger, accessCloser, err := getAccessLogger(boot.logFile, boot.logFormat)
if err != nil {
return fmt.Errorf("configure access logger: %v", err)
}
defer accessCloser.Close()
up := wrapRaven(upstream.NewUpstream(cfg, accessLogger))
go func() { finalErrors <- http.Serve(listener, up) }()
return <-finalErrors
}