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go-carbon.go
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go-carbon.go
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package main
import (
"expvar"
"flag"
"fmt"
"log"
"net"
"net/http"
_ "net/http/pprof" // skipcq: GO-S2108
"os"
"os/signal"
"os/user"
"regexp"
"runtime"
"strconv"
"syscall"
"github.com/lomik/zapwriter"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
daemon "github.com/sevlyar/go-daemon"
"go.uber.org/zap"
"github.com/go-graphite/go-carbon/carbon"
"github.com/go-graphite/go-carbon/carbonserver"
"github.com/go-graphite/go-carbon/points"
)
// Version of go-carbon
const Version = "0.17.3"
var BuildVersion = "(development version)"
func httpServe(addr string) (func(), error) {
tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return nil, err
}
listener, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
return nil, err
}
server := &http.Server{
// TODO: set read timeout
}
go server.Serve(listener)
return func() { listener.Close() }, nil
}
func main() {
var err error
/* CONFIG start */
configFile := flag.String("config", "", "Filename of config")
printDefaultConfig := flag.Bool("config-print-default", false, "Print default config")
checkConfig := flag.Bool("check-config", false, "Check config and exit")
// Scan metrics to check if there are mismatches against schema and aggregation configs.
checkPolicies := flag.Int("check-policies", 0, "Scan all whisper files for inconsistencies of schema and aggregation policies. Triggered with a positive value. The positive value is used for specifying the check speed (unit: metrics per second). Example value: 120.")
printInconsistentMetrics := flag.Bool("print-inconsistent-metrics", false, "Prints metric path with inconsistent configs, Used with -check-policies.")
printVersion := flag.Bool("version", false, "Print version")
isDaemon := flag.Bool("daemon", false, "Run in background")
pidfile := flag.String("pidfile", "", "Pidfile path (only for daemon)")
cat := flag.String("cat", "", "Print cache dump file")
printFLC := flag.String("print-file-list-cache", "", "Print file list cache. (format: $path_to_cache. example: /var/lib/carbon/carbonserver-file-list-cache.bin)")
flag.Parse()
if *printVersion {
fmt.Println(Version)
fmt.Println(BuildVersion)
return
}
if *cat != "" {
err = points.ReadFromFile(*cat, func(p *points.Points) {
for _, d := range p.Data { // every metric point
fmt.Printf("%s %v %v\n", p.Metric, d.Value, d.Timestamp)
}
})
if err != nil {
log.Fatal(err)
}
return
}
if *printFLC != "" {
path := *printFLC
if err := carbonserver.ReadFileListCache(path, carbonserver.FLCVersionUnspecified, os.Stdout); err != nil {
fmt.Fprintf(os.Stderr, "failed to read flc cache: %s\n", err.Error())
}
return
}
if *printDefaultConfig {
if err = carbon.PrintDefaultConfig(); err != nil {
log.Fatal(err)
}
return
}
app := carbon.New(*configFile)
if err = app.ParseConfig(); err != nil {
log.Fatal(err)
}
cfg := app.Config
var runAsUser *user.User
if cfg.Common.User != "" {
runAsUser, err = user.Lookup(cfg.Common.User)
if err != nil {
log.Fatal(err)
}
}
// config parsed successfully. Exit in check-only mode
if *checkConfig {
return
}
if *checkPolicies > 0 {
app.CheckPersisterPolicyConsistencies(*checkPolicies, *printInconsistentMetrics)
return
}
for i := 0; i < len(cfg.Logging); i++ {
if err := zapwriter.PrepareFileForUser(cfg.Logging[i].File, runAsUser); err != nil {
log.Fatal(err)
}
}
if err = zapwriter.ApplyConfig(cfg.Logging); err != nil {
log.Fatal(err)
}
mainLogger := zapwriter.Logger("main")
if *isDaemon {
runtime.LockOSThread()
context := new(daemon.Context)
if *pidfile != "" {
context.PidFileName = *pidfile
context.PidFilePerm = 0644
}
if runAsUser != nil {
uid, err := strconv.ParseInt(runAsUser.Uid, 10, 0)
if err != nil {
mainLogger.Fatal(err.Error())
}
gid, err := strconv.ParseInt(runAsUser.Gid, 10, 0)
if err != nil {
mainLogger.Fatal(err.Error())
}
context.Credential = &syscall.Credential{
Uid: uint32(uid),
Gid: uint32(gid),
}
}
child, _ := context.Reborn()
if child != nil {
return
}
defer context.Release()
runtime.UnlockOSThread()
}
/* CONFIG end */
// pprof
// httpStop := func() {}
if cfg.Pprof.Enabled || cfg.Prometheus.Enabled {
_, err = httpServe(cfg.Pprof.Listen)
if err != nil {
mainLogger.Fatal(err.Error())
}
}
if cfg.Pprof.Enabled {
expvar.NewString("GoVersion").Set(runtime.Version())
expvar.NewString("BuildVersion").Set(BuildVersion)
expvar.NewString("Version").Set(Version)
expvar.Publish("Config", expvar.Func(func() interface{} { return cfg }))
expvar.Publish("GoroutineCount", expvar.Func(func() interface{} { return runtime.NumGoroutine() }))
}
if cfg.Prometheus.Enabled {
app.PromRegisterer.MustRegister(
collectors.NewBuildInfoCollector(),
collectors.NewGoCollector(
collectors.WithGoCollectorRuntimeMetrics(collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}),
),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}))
http.Handle(cfg.Prometheus.Endpoint, promhttp.HandlerFor(app.PromRegistry, promhttp.HandlerOpts{}))
}
if err = app.Start(); err != nil {
mainLogger.Fatal(err.Error())
} else {
mainLogger.Info("started")
}
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGUSR2)
for {
<-c
app.DumpStop()
os.Exit(0)
}
}()
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGHUP)
for {
<-c
mainLogger.Info("HUP received. Reload config")
if err := app.ReloadConfig(); err != nil {
mainLogger.Error("config reload failed", zap.Error(err))
} else {
mainLogger.Info("config successfully reloaded")
}
}
}()
app.Loop()
mainLogger.Info("stopped")
}