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server.go
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server.go
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package graceful
import (
"context"
"fmt"
"log"
"net"
"net/http"
"os"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/golang/glog"
"github.com/pressly/chi"
)
const (
contextTimeoutHeader = "context-timeout"
)
func init() {
http.DefaultTransport.(*http.Transport).MaxIdleConns = 1000
http.DefaultTransport.(*http.Transport).MaxIdleConnsPerHost = 1000
}
type Server struct {
mux *chi.Mux
serv http.Server
errc chan error
shutdownFlag int32
}
func NewServer() *Server {
s := &Server{
mux: chi.NewMux(),
errc: make(chan error, 1),
}
// s.restoreContextTimeoutMiddleware()
s.serv.Handler = s.mux
return s
}
func (s *Server) Use(m ...func(http.Handler) http.Handler) {
s.mux.Use(m...)
}
func (s *Server) HandleHostname() {
h, err := os.Hostname()
if err != nil {
panic(err)
}
s.mux.Get("/hostname", func(w http.ResponseWriter, req *http.Request) {
_, err := fmt.Fprintf(w, "%s", h)
if err != nil {
log.Printf("response error: %v", err)
}
})
}
func (s *Server) Handle(p string, h http.Handler) {
s.mux.Handle(p, h)
}
func (s *Server) Mount(dir string, h http.Handler) {
if !strings.HasSuffix(dir, "/") {
dir += "/"
}
s.mux.Mount(dir, h)
}
func (s *Server) ListenAndServe(addr string) error {
l, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return s.Serve(l)
}
func (s *Server) Serve(l net.Listener) error {
err := s.serv.Serve(l)
s.errc <- err
return err
}
func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
s.mux.ServeHTTP(w, req)
}
func (s *Server) Stop() error {
if err := s.serv.Close(); err != nil {
return err
}
return <-s.errc
}
func (s *Server) Shutdown(ctx context.Context, d time.Duration) error {
atomic.StoreInt32(&s.shutdownFlag, 1)
time.Sleep(d)
if err := s.serv.Shutdown(ctx); err != nil {
return err
}
return <-s.errc
}
func (s *Server) UseShutdownMiddleware(code int, body []byte) {
m := func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
if atomic.LoadInt32(&s.shutdownFlag) == 0 {
next.ServeHTTP(w, r)
return
}
w.WriteHeader(code)
if _, err := w.Write(body); err != nil {
glog.Errorf("write shutdown response error: %v", err)
}
}
return http.HandlerFunc(fn)
}
s.mux.Use(m)
}
// restoreContextTimeoutMiddleware write timeout from http-header to context
func (s *Server) restoreContextTimeoutMiddleware() {
m := func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
str := r.Header.Get(contextTimeoutHeader)
timeout, err := strconv.ParseInt(str, 16, 64)
if err == nil {
ctx, cancel := context.WithTimeout(r.Context(), time.Duration(timeout))
defer cancel()
r = r.WithContext(ctx)
r.Header.Del(contextTimeoutHeader)
}
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
s.mux.Use(m)
}