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|
package main
import (
"context"
"errors"
"flag"
"fmt"
"net"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitaly/internal/praefect"
"gitlab.com/gitlab-org/gitaly/internal/praefect/config"
"gitlab.com/gitlab-org/gitaly/internal/praefect/protoregistry"
"gitlab.com/gitlab-org/gitaly/internal/version"
"gitlab.com/gitlab-org/labkit/tracing"
)
var (
flagConfig = flag.String("config", "", "Location for the config.toml")
flagVersion = flag.Bool("version", false, "Print version and exit")
logger = logrus.New()
errNoConfigFile = errors.New("the config flag must be passed")
)
func main() {
flag.Parse()
// If invoked with -version
if *flagVersion {
fmt.Println(version.GetVersionString())
os.Exit(0)
}
conf, err := configure()
if err != nil {
logger.Fatal(err)
}
listeners, err := getListeners(conf.SocketPath, conf.ListenAddr)
if err != nil {
logger.Fatalf("%s", err)
}
if err := run(listeners, conf); err != nil {
logger.Fatalf("%v", err)
}
}
func configure() (config.Config, error) {
var conf config.Config
if *flagConfig == "" {
return conf, errNoConfigFile
}
conf, err := config.FromFile(*flagConfig)
if err != nil {
return conf, fmt.Errorf("error reading config file: %v", err)
}
if err := conf.Validate(); err != nil {
return conf, err
}
logger = conf.ConfigureLogger()
tracing.Initialize(tracing.WithServiceName("praefect"))
if conf.PrometheusListenAddr != "" {
logger.WithField("address", conf.PrometheusListenAddr).Info("Starting prometheus listener")
promMux := http.NewServeMux()
promMux.Handle("/metrics", promhttp.Handler())
go func() {
http.ListenAndServe(conf.PrometheusListenAddr, promMux)
}()
}
registerServerVersionPromGauge()
logger.WithField("version", praefect.GetVersionString()).Info("Starting Praefect")
return conf, nil
}
func run(listeners []net.Listener, conf config.Config) error {
var (
// top level server dependencies
datastore = praefect.NewMemoryDatastore(conf)
coordinator = praefect.NewCoordinator(logger, datastore, protoregistry.GitalyProtoFileDescriptors...)
repl = praefect.NewReplMgr("default", logger, datastore, datastore, coordinator, praefect.WithWhitelist(conf.Whitelist))
srv = praefect.NewServer(coordinator, repl, nil, logger)
// signal related
signals = []os.Signal{syscall.SIGTERM, syscall.SIGINT}
termCh = make(chan os.Signal, len(signals))
serverErrors = make(chan error, 1)
)
signal.Notify(termCh, signals...)
for _, l := range listeners {
go func(lis net.Listener) { serverErrors <- srv.Start(lis) }(l)
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
for _, node := range conf.StorageNodes {
if err := coordinator.RegisterNode(node.Storage, node.Address); err != nil {
return fmt.Errorf("failed to register %s: %s", node.Address, err)
}
logger.WithField("node_address", node.Address).Info("registered gitaly node")
}
go func() { serverErrors <- repl.ProcessBacklog(ctx) }()
go coordinator.FailoverRotation()
select {
case s := <-termCh:
logger.WithField("signal", s).Warn("received signal, shutting down gracefully")
cancel() // cancels the replicator job processing
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
if shutdownErr := srv.Shutdown(ctx); shutdownErr != nil {
logger.Warnf("error received during shutting down: %v", shutdownErr)
return shutdownErr
}
case err := <-serverErrors:
return err
}
return nil
}
func getListeners(socketPath, listenAddr string) ([]net.Listener, error) {
var listeners []net.Listener
if socketPath != "" {
if err := os.RemoveAll(socketPath); err != nil {
return nil, err
}
cleanPath := strings.TrimPrefix(socketPath, "unix:")
l, err := net.Listen("unix", cleanPath)
if err != nil {
return nil, err
}
listeners = append(listeners, l)
logger.WithField("address", socketPath).Info("listening on unix socket")
}
if listenAddr != "" {
l, err := net.Listen("tcp", listenAddr)
if err != nil {
return nil, err
}
listeners = append(listeners, l)
logger.WithField("address", listenAddr).Info("listening at tcp address")
}
return listeners, nil
}
// registerServerVersionPromGauge registers a label with the current server version
// making it easy to see what versions of Gitaly are running across a cluster
func registerServerVersionPromGauge() {
gitlabBuildInfoGauge := prometheus.NewGauge(prometheus.GaugeOpts{
Name: "gitlab_build_info",
Help: "Current build info for this GitLab Service",
ConstLabels: prometheus.Labels{
"version": praefect.GetVersion(),
"built": praefect.GetBuildTime(),
},
})
prometheus.MustRegister(gitlabBuildInfoGauge)
gitlabBuildInfoGauge.Set(1)
}
|
