forked from quay/clair
/
main.go
165 lines (151 loc) · 4.21 KB
/
main.go
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package main
import (
"context"
"flag"
"fmt"
golog "log"
"net/http"
"os"
"os/signal"
"time"
_ "github.com/quay/claircore/updater/defaults"
"github.com/quay/zlog"
"go.opentelemetry.io/otel/baggage"
"go.opentelemetry.io/otel/label"
"golang.org/x/sync/errgroup"
yaml "gopkg.in/yaml.v3"
"github.com/quay/clair/v4/config"
"github.com/quay/clair/v4/health"
"github.com/quay/clair/v4/httptransport"
"github.com/quay/clair/v4/initialize"
"github.com/quay/clair/v4/introspection"
)
// Version is a version string, injected at build time for release builds.
var Version string
const (
envConfig = `CLAIR_CONF`
envMode = `CLAIR_MODE`
)
func main() {
// parse conf from cli
var (
confFile ConfValue
conf config.Config
runMode ConfMode
)
confFile.Set(os.Getenv(envConfig))
runMode.Set(os.Getenv(envMode))
flag.Var(&confFile, "conf", "The file system path to Clair's config file.")
flag.Var(&runMode, "mode", "The operation mode for this server.")
flag.Parse()
if confFile.String() == "" {
golog.Fatalf("must provide a -conf flag or set %q in the environment", envConfig)
}
fail := false
defer func() {
if fail {
os.Exit(1)
}
}()
// validate config
err := yaml.NewDecoder(confFile.file).Decode(&conf)
if err != nil {
golog.Fatalf("failed to decode yaml config: %v", err)
}
conf.Mode = runMode.String()
err = config.Validate(&conf)
if err != nil {
golog.Fatalf("failed to validate config: %v", err)
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
if err := initialize.Logging(ctx, &conf); err != nil {
golog.Fatalf("failed to set up logging: %v", err)
}
ctx = baggage.ContextWithValues(ctx, label.String("component", "main"))
zlog.Info(ctx).
Str("version", Version).
Msg("starting")
// Some machinery for starting and stopping server goroutines:
down := &Shutdown{}
srvs, srvctx := errgroup.WithContext(ctx)
// Introspection server goroutine.
srvs.Go(func() (_ error) {
zlog.Info(srvctx).Msg("launching introspection server")
i, err := introspection.New(srvctx, conf, nil)
if err != nil {
zlog.Warn(srvctx).
Err(err).Msg("introspection server configuration failed. continuing anyway")
return
}
down.Add(i.Server)
if err := i.ListenAndServe(); err != http.ErrServerClosed {
zlog.Warn(srvctx).
Err(err).Msg("introspection server failed to launch. continuing anyway")
}
return
})
// HTTP API server goroutine.
srvs.Go(func() error {
zlog.Info(srvctx).Msg("launching http transport")
srvs, err := initialize.Services(srvctx, &conf)
if err != nil {
return fmt.Errorf("service initialization failed: %w", err)
}
h, err := httptransport.New(srvctx, conf, srvs.Indexer, srvs.Matcher, srvs.Notifier)
if err != nil {
return fmt.Errorf("http transport configuration failed: %w", err)
}
down.Add(h.Server)
health.Ready()
if err := h.ListenAndServe(); err != http.ErrServerClosed {
return fmt.Errorf("http transport failed to launch: %w", err)
}
return nil
})
// Signal handler goroutine.
srvs.Go(func() error {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
defer func() {
signal.Stop(c)
close(c)
zlog.Info(ctx).Msg("unregistered signal handler")
}()
zlog.Info(ctx).Msg("registered signal handler")
select {
case sig := <-c:
zlog.Info(ctx).
Stringer("signal", sig).
Msg("gracefully shutting down")
// Note that we're using the root context here, so that we get a
// full timeout if one errgroup goroutine returns uncleanly.
tctx, done := context.WithTimeout(ctx, 10*time.Second)
err := down.Shutdown(tctx)
done()
if err != nil {
zlog.Error(ctx).Err(err).Msg("error shutting down server")
}
case <-srvctx.Done():
}
return nil
})
// Spawn a goroutine outside to wait on the errgroup.
//
// This is needed to call shutdown and cause the servers to return when only
// one has returned an error.
go func() {
<-srvctx.Done()
tctx, done := context.WithTimeout(ctx, 10*time.Second)
err := down.Shutdown(tctx)
done()
if err != nil {
zlog.Error(ctx).Err(err).Msg("error shutting down server")
}
}()
zlog.Info(ctx).Str("version", Version).Msg("ready")
if err := srvs.Wait(); err != nil {
zlog.Error(ctx).Err(err).Msg("fatal error")
fail = true
}
}