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http_graceful.go
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/
http_graceful.go
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package server
import (
"context"
"errors"
"net/http"
"os"
"os/signal"
"time"
"github.com/ehwjh2010/viper"
"github.com/ehwjh2010/viper/constant"
"github.com/ehwjh2010/viper/log"
"github.com/ehwjh2010/viper/verror"
wrapErrs "github.com/pkg/errors"
)
var (
InvalidHttpConf = errors.New("invalid http config")
InvalidHttpEngine = errors.New("invalid http engine")
)
func getStopChan() chan os.Signal {
stopChan := make(chan os.Signal, 1)
signal.Notify(stopChan, constant.ListenSignals...)
return stopChan
}
func getErrChan() chan error {
errChan := make(chan error)
return errChan
}
func GraceHttpServer(graceHttp *GraceHttp) error {
log.Infof(viper.SIGN + "\n" + "Viper Version: " + viper.VERSION)
if graceHttp == nil {
return InvalidHttpConf
}
if graceHttp.Engine == nil {
return InvalidHttpEngine
}
//Invoke OnStartUp
log.Debugf("execute on startup functions")
if err := graceHttp.ExecuteStartUp(); err != nil {
return wrapErrs.Wrap(err, "on start function occur err")
}
defer func() {
log.Debugf("execute on shutdown functions")
if closeErrs := graceHttp.ExecuteStartUp(); closeErrs != nil {
log.Errors(closeErrs)
}
}()
srv := &http.Server{
Addr: graceHttp.Addr,
Handler: graceHttp.Engine,
}
stopChan := getStopChan()
errChan := getErrChan()
// Initializing the server in a goroutine so that
// it won't block the graceful shutdown handling below
go func() {
if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
errChan <- err
}
}()
var grpcFlag bool
if graceHttp.GraceGrpc != nil {
graceGrpcServer(graceHttp.GraceGrpc, errChan)
grpcFlag = true
}
select {
case <-stopChan:
var multiErr verror.MultiErr
log.Infof("Shutting down gracefully")
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(graceHttp.WaitSecond)*time.Second)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
multiErr.AddErr(wrapErrs.Wrap(err, "stop server failed!!!"))
}
if grpcFlag {
graceHttp.GraceGrpc.Server.GracefulStop()
}
return multiErr.AsStdErr()
case e := <-errChan:
return e
}
}