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server.go
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server.go
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package httputils
import (
"context"
"fmt"
syslog "log"
"net/http"
"os"
"os/signal"
"time"
"github.com/foomo/webgrapple/pkg/log"
)
var (
DefaultShutdownTimeout = 5 * time.Second
DefaultShutdownSignals = []os.Signal{
os.Interrupt,
os.Kill,
}
)
type serverErrorLogWriter struct {
name string
l log.Logger
}
func (s *serverErrorLogWriter) Write(p []byte) (int, error) {
s.l.Error(fmt.Sprintf("%s: %s", s.name, string(p)))
return len(p), nil
}
func GracefulHttpServer(ctx context.Context, l log.Logger, name string, address string, handler http.Handler) *http.Server {
httpServer := &http.Server{
Addr: address,
Handler: handler,
ErrorLog: syslog.New(&serverErrorLogWriter{
l: l,
name: name,
}, "", 0),
}
idleConnectionsClosed := make(chan struct{})
go func() {
sig := make(chan os.Signal, 1)
for _, s := range DefaultShutdownSignals {
signal.Notify(sig, s)
}
select {
case s := <-sig:
l.Info(fmt.Sprintf("server %q shutdown initiated due to signal %v", address, s))
case <-ctx.Done():
l.Info(fmt.Sprintf("server %q shutdown initiated due to context", address))
}
shutdownCtx, _ := context.WithTimeout(context.Background(), DefaultShutdownTimeout)
if err := httpServer.Shutdown(shutdownCtx); err != nil {
l.Info(fmt.Sprintf("HTTP Server Shutdown Error: %v", err))
}
close(idleConnectionsClosed)
}()
return httpServer
}