/
main.go
174 lines (139 loc) · 5.14 KB
/
main.go
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package main
import (
"context"
"errors"
"expvar"
"fmt"
"net/http"
"net/http/pprof"
"os"
"os/signal"
"runtime"
"syscall"
"time"
"github.com/ardanlabs/conf/v3"
"github.com/ardanlabs/service/api/cmd/services/metrics/collector"
"github.com/ardanlabs/service/api/cmd/services/metrics/publisher"
expvarsrv "github.com/ardanlabs/service/api/cmd/services/metrics/publisher/expvar"
prometheussrv "github.com/ardanlabs/service/api/cmd/services/metrics/publisher/prometheus"
"github.com/ardanlabs/service/foundation/logger"
)
var build = "develop"
func main() {
var log *logger.Logger
events := logger.Events{
Error: func(ctx context.Context, r logger.Record) { log.Info(ctx, "******* SEND ALERT ******") },
}
traceIDFn := func(ctx context.Context) string {
return "00000000-0000-0000-0000-000000000000"
}
log = logger.NewWithEvents(os.Stdout, logger.LevelInfo, "METRICS", traceIDFn, events)
// -------------------------------------------------------------------------
ctx := context.Background()
if err := run(ctx, log); err != nil {
log.Error(ctx, "startup", "msg", err)
os.Exit(1)
}
}
func run(ctx context.Context, log *logger.Logger) error {
// -------------------------------------------------------------------------
// GOMAXPROCS
log.Info(ctx, "startup", "GOMAXPROCS", runtime.GOMAXPROCS(0))
// -------------------------------------------------------------------------
// Configuration
cfg := struct {
conf.Version
Web struct {
DebugHost string `conf:"default:0.0.0.0:4010"`
}
Expvar struct {
Host string `conf:"default:0.0.0.0:4000"`
Route string `conf:"default:/metrics"`
ReadTimeout time.Duration `conf:"default:5s"`
WriteTimeout time.Duration `conf:"default:10s"`
IdleTimeout time.Duration `conf:"default:120s"`
ShutdownTimeout time.Duration `conf:"default:5s"`
}
Prometheus struct {
Host string `conf:"default:0.0.0.0:4020"`
Route string `conf:"default:/metrics"`
ReadTimeout time.Duration `conf:"default:5s"`
WriteTimeout time.Duration `conf:"default:10s"`
IdleTimeout time.Duration `conf:"default:120s"`
ShutdownTimeout time.Duration `conf:"default:5s"`
}
Collect struct {
From string `conf:"default:http://localhost:3010/debug/vars"`
}
Publish struct {
To string `conf:"default:console"`
Interval time.Duration `conf:"default:5s"`
}
}{
Version: conf.Version{
Build: build,
Desc: "copyright information here",
},
}
const prefix = "METRICS"
help, err := conf.Parse(prefix, &cfg)
if err != nil {
if errors.Is(err, conf.ErrHelpWanted) {
fmt.Println(help)
return nil
}
return fmt.Errorf("parsing config: %w", err)
}
// -------------------------------------------------------------------------
// App Starting
log.Info(ctx, "starting service", "version", build)
defer log.Info(ctx, "shutdown complete")
out, err := conf.String(&cfg)
if err != nil {
return fmt.Errorf("generating config for output: %w", err)
}
log.Info(ctx, "startup", "config", out)
// -------------------------------------------------------------------------
// Start Debug Service
log.Info(ctx, "startup", "status", "debug router started", "host", cfg.Web.DebugHost)
mux := http.NewServeMux()
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
mux.Handle("/debug/vars", expvar.Handler())
go func() {
if err := http.ListenAndServe(cfg.Web.DebugHost, mux); err != nil {
log.Error(ctx, "shutdown", "status", "debug router closed", "host", cfg.Web.DebugHost, "msg", err)
}
}()
// -------------------------------------------------------------------------
// Start Prometheus Service
prom := prometheussrv.New(log, cfg.Prometheus.Host, cfg.Prometheus.Route, cfg.Prometheus.ReadTimeout, cfg.Prometheus.WriteTimeout, cfg.Prometheus.IdleTimeout)
defer prom.Stop(cfg.Prometheus.ShutdownTimeout)
// -------------------------------------------------------------------------
// Start expvar Service
exp := expvarsrv.New(log, cfg.Expvar.Host, cfg.Expvar.Route, cfg.Expvar.ReadTimeout, cfg.Expvar.WriteTimeout, cfg.Expvar.IdleTimeout)
defer exp.Stop(cfg.Expvar.ShutdownTimeout)
// -------------------------------------------------------------------------
// Start collectors and publishers
collector, err := collector.New(cfg.Collect.From)
if err != nil {
return fmt.Errorf("starting collector: %w", err)
}
stdout := publisher.NewStdout(log)
publish, err := publisher.New(log, collector, cfg.Publish.Interval, prom.Publish, exp.Publish, stdout.Publish)
if err != nil {
return fmt.Errorf("starting publisher: %w", err)
}
defer publish.Stop()
// -------------------------------------------------------------------------
// Shutdown
shutdown := make(chan os.Signal, 1)
signal.Notify(shutdown, syscall.SIGINT, syscall.SIGTERM)
<-shutdown
log.Info(ctx, "shutdown", "status", "shutdown started")
defer log.Info(ctx, "shutdown", "status", "shutdown complete")
return nil
}