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server.go
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server.go
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package main
import (
"context"
"fmt"
"net"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"github.com/oklog/run"
"github.com/sirupsen/logrus"
"github.com/t-mutaguchi-10antz/go-encoding" // プライベートリポジトリ
)
var (
log *logrus.Logger
srv *http.Server
)
const (
gracefulDuration = 10 * time.Second
)
func init() {
initLog()
initSrv()
}
func main() {
g := run.Group{}
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGTERM, syscall.SIGINT)
cancel := make(chan struct{})
g.Add(
func() error {
select {
case <-sig:
case <-cancel:
}
return nil
},
func(err error) {
close(cancel)
},
)
g.Add(
func() error {
log.Infof("start serving on %s", srv.Addr)
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Errorf("failed to serve: %v", err)
return fmt.Errorf("failed to serve: %w", err)
}
return nil
},
func(err error) {
log.Infof("gracefully shutting down...")
ctx, cancel := context.WithTimeout(context.Background(), gracefulDuration)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
log.Fatalf("forced shutdown: %+v", err)
}
log.Infof("graceful shutdown")
},
)
if err := g.Run(); err != nil {
os.Exit(1)
}
}
func initSrv() {
var port string
if v := os.Getenv("PORT"); v != "" {
port = v
} else {
port = "8080"
}
mux := http.NewServeMux()
mux.HandleFunc("/favicon.ico", func(w http.ResponseWriter, r *http.Request) {})
mux.HandleFunc("/healthy", func(w http.ResponseWriter, r *http.Request) {
dbAvailable := true
if dbAvailable {
w.WriteHeader(http.StatusOK)
} else {
w.WriteHeader(http.StatusInternalServerError)
}
})
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
time.Sleep(5 * time.Second)
reqID := encoding.UUID()
log.Infof("x-request-id: %s", reqID)
w.Header().Set("x-request-id", reqID)
_, _ = w.Write([]byte(fmt.Sprintf("Hello! RequestID: %s\n", reqID)))
})
srv = &http.Server{
Addr: net.JoinHostPort("0.0.0.0", port),
Handler: mux,
}
}
func initLog() {
log = &logrus.Logger{}
fieldMap := logrus.FieldMap{
logrus.FieldKeyTime: "timestamp",
logrus.FieldKeyLevel: "severity",
logrus.FieldKeyMsg: "message",
}
switch os.Getenv("LOG_FORMAT") {
case "json":
log.Formatter = &logrus.JSONFormatter{FieldMap: fieldMap, TimestampFormat: time.RFC3339Nano}
default:
log.Formatter = &logrus.TextFormatter{FieldMap: fieldMap, TimestampFormat: time.RFC3339Nano}
}
switch os.Getenv("LOG_LEVEL") {
case "trace":
log.Level = logrus.TraceLevel
log.Out = os.Stdout
case "info":
log.Level = logrus.InfoLevel
log.Out = os.Stdout
case "debug":
log.Level = logrus.DebugLevel
log.Out = os.Stdout
case "warn", "warning":
log.Level = logrus.WarnLevel
log.Out = os.Stderr
case "error":
log.Level = logrus.ErrorLevel
log.Out = os.Stderr
case "fatal":
log.Level = logrus.FatalLevel
log.Out = os.Stderr
default:
log.Level = logrus.PanicLevel
log.Out = os.Stderr
}
}