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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
cortex_log "github.com/cortexproject/cortex/pkg/util/log"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/agent/pkg/operator"
"github.com/grafana/agent/pkg/operator/logutil"
"github.com/prometheus/common/version"
controller "sigs.k8s.io/controller-runtime"
// Needed for clients.
_ "k8s.io/client-go/plugin/pkg/client/auth"
)
func main() {
var (
logger = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
cfg = loadConfig(logger)
err error
)
logger = setupLogger(logger, cfg)
op, err := operator.New(logger, cfg)
if err != nil {
level.Error(logger).Log("msg", "unable to create operator", "err", err)
os.Exit(1)
}
// Run the manager and wait for a signal to shut down.
level.Info(logger).Log("msg", "starting manager")
if err := op.Start(controller.SetupSignalHandler()); err != nil {
level.Error(logger).Log("msg", "problem running manager", "err", err)
os.Exit(1)
}
}
// loadConfig will read command line flags and populate a Config. loadConfig
// will exit the program on failure.
func loadConfig(l log.Logger) *operator.Config {
fs := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
var (
printVersion bool
)
cfg, err := operator.NewConfig(fs)
if err != nil {
level.Error(l).Log("msg", "failed to parse flags", "err", err)
os.Exit(1)
}
fs.BoolVar(&printVersion, "version", false, "Print this build's version information")
if err := fs.Parse(os.Args[1:]); err != nil {
level.Error(l).Log("msg", "failed to parse flags", "err", err)
os.Exit(1)
}
if printVersion {
fmt.Println(version.Print("agent-operator"))
os.Exit(0)
}
return cfg
}
// setupLogger sets up our logger. If this function fails, the program will
// exit.
func setupLogger(l log.Logger, cfg *operator.Config) log.Logger {
newLogger, err := cortex_log.NewPrometheusLogger(cfg.LogLevel, cfg.LogFormat)
if err != nil {
level.Error(l).Log("msg", "failed to create logger", "err", err)
os.Exit(1)
}
l = newLogger
adapterLogger := logutil.Wrap(l)
// NOTE: we don't set up a caller field here, unlike the normal agent.
// There's too many multiple nestings of the logger that prevent getting the
// caller from working properly.
// Set up the global logger and the controller-local logger.
controller.SetLogger(adapterLogger)
cfg.Controller.Logger = adapterLogger
return l
}