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setup.go
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setup.go
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package helpers
import (
"flag"
"fmt"
"os"
"path/filepath"
"github.com/grafana/dskit/server"
"github.com/grafana/dskit/services"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/collectors/version"
"github.com/grafana/loki/v3/pkg/loki"
"github.com/grafana/loki/v3/pkg/storage"
"github.com/grafana/loki/v3/pkg/storage/chunk/client/util"
"github.com/grafana/loki/v3/pkg/storage/config"
"github.com/grafana/loki/v3/pkg/storage/stores/shipper/indexshipper"
"github.com/grafana/loki/v3/pkg/util/cfg"
util_log "github.com/grafana/loki/v3/pkg/util/log"
"github.com/grafana/loki/v3/pkg/validation"
)
func Setup() (loki.Config, services.Service, string, error) {
var c loki.ConfigWrapper
if err := cfg.DynamicUnmarshal(&c, os.Args[1:], flag.CommandLine); err != nil {
fmt.Fprintf(os.Stderr, "failed parsing config: %v\n", err)
os.Exit(1)
}
bucket := os.Getenv("BUCKET")
dir := os.Getenv("DIR")
if bucket == "" {
return c.Config, nil, "", fmt.Errorf("$BUCKET must be specified")
}
if dir == "" {
return c.Config, nil, "", fmt.Errorf("$DIR must be specified")
}
if err := util.EnsureDirectory(dir); err != nil {
return c.Config, nil, "", fmt.Errorf("failed to ensure directory %s: %w", dir, err)
}
c.Config.StorageConfig.TSDBShipperConfig.Mode = indexshipper.ModeReadOnly
util_log.InitLogger(&c.Server, prometheus.DefaultRegisterer, false)
c.Config.StorageConfig.TSDBShipperConfig.ActiveIndexDirectory = filepath.Join(dir, "tsdb-active")
c.Config.StorageConfig.TSDBShipperConfig.CacheLocation = filepath.Join(dir, "tsdb-cache")
svc, err := moduleManager(&c.Config.Server)
if err != nil {
return c.Config, nil, "", err
}
return c.Config, svc, bucket, nil
}
func moduleManager(cfg *server.Config) (services.Service, error) {
prometheus.MustRegister(version.NewCollector("loki"))
// unregister default go collector
prometheus.Unregister(collectors.NewGoCollector())
// register collector with additional metrics
prometheus.MustRegister(collectors.NewGoCollector(
collectors.WithGoCollectorRuntimeMetrics(collectors.MetricsAll),
))
if cfg.HTTPListenPort == 0 {
cfg.HTTPListenPort = 8080
}
serv, err := server.New(*cfg)
if err != nil {
return nil, err
}
s := loki.NewServerService(serv, func() []services.Service { return nil })
return s, nil
}
func DefaultConfigs() (config.ChunkStoreConfig, *validation.Overrides, storage.ClientMetrics) {
var (
chunkStoreConfig config.ChunkStoreConfig
limits validation.Limits
clientMetrics storage.ClientMetrics
)
chunkStoreConfig.RegisterFlags(flag.NewFlagSet("chunk-store", flag.PanicOnError))
limits.RegisterFlags(flag.NewFlagSet("limits", flag.PanicOnError))
overrides, _ := validation.NewOverrides(limits, nil)
return chunkStoreConfig, overrides, clientMetrics
}
func ExitErr(during string, err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "encountered error during %s: %v\n", during, err)
os.Exit(1)
}
}