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234 lines (201 loc) · 6.5 KB
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package http
import (
"context"
"crypto/tls"
"errors"
"log"
"net"
"net/http"
"os"
"runtime/pprof"
"sync"
"sync/atomic"
"time"
"github.com/dustin/go-humanize"
)
var (
// GlobalMinIOVersion - is sent in the header to all http targets
GlobalMinIOVersion string
// GlobalDeploymentID - is sent in the header to all http targets
GlobalDeploymentID string
)
const (
serverShutdownPoll = 500 * time.Millisecond
// DefaultShutdownTimeout - default shutdown timeout to gracefully shutdown server.
DefaultShutdownTimeout = 5 * time.Second
// DefaultIdleTimeout for idle inactive connections
DefaultIdleTimeout = 30 * time.Second
// DefaultReadHeaderTimeout for very slow inactive connections
DefaultReadHeaderTimeout = 30 * time.Second
// DefaultMaxHeaderBytes - default maximum HTTP header size in bytes.
DefaultMaxHeaderBytes = 1 * humanize.MiByte
)
// Server - extended http.Server supports multiple addresses to serve and enhanced connection handling.
type Server struct {
http.Server
Addrs []string // addresses on which the server listens for new connection.
ShutdownTimeout time.Duration // timeout used for graceful server shutdown.
listenerMutex sync.Mutex // to guard 'listener' field.
listener *httpListener // HTTP listener for all 'Addrs' field.
inShutdown uint32 // indicates whether the server is in shutdown or not
requestCount int32 // counter holds no. of request in progress.
}
// GetRequestCount - returns number of request in progress.
func (srv *Server) GetRequestCount() int {
return int(atomic.LoadInt32(&srv.requestCount))
}
// Start - start HTTP server
func (srv *Server) Start(ctx context.Context) (err error) {
// Take a copy of server fields.
var tlsConfig *tls.Config
if srv.TLSConfig != nil {
tlsConfig = srv.TLSConfig.Clone()
}
handler := srv.Handler // if srv.Handler holds non-synced state -> possible data race
// Create new HTTP listener.
var listener *httpListener
listener, err = newHTTPListener(
ctx,
srv.Addrs,
)
if err != nil {
return err
}
// Wrap given handler to do additional
// * return 503 (service unavailable) if the server in shutdown.
wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// If server is in shutdown.
if atomic.LoadUint32(&srv.inShutdown) != 0 {
// To indicate disable keep-alives
w.Header().Set("Connection", "close")
w.WriteHeader(http.StatusServiceUnavailable)
w.Write([]byte(http.ErrServerClosed.Error()))
return
}
atomic.AddInt32(&srv.requestCount, 1)
defer atomic.AddInt32(&srv.requestCount, -1)
// Handle request using passed handler.
handler.ServeHTTP(w, r)
})
srv.listenerMutex.Lock()
srv.Handler = wrappedHandler
srv.listener = listener
srv.listenerMutex.Unlock()
// Start servicing with listener.
if tlsConfig != nil {
return srv.Server.Serve(tls.NewListener(listener, tlsConfig))
}
return srv.Server.Serve(listener)
}
// Shutdown - shuts down HTTP server.
func (srv *Server) Shutdown() error {
srv.listenerMutex.Lock()
if srv.listener == nil {
srv.listenerMutex.Unlock()
return http.ErrServerClosed
}
srv.listenerMutex.Unlock()
if atomic.AddUint32(&srv.inShutdown, 1) > 1 {
// shutdown in progress
return http.ErrServerClosed
}
// Close underneath HTTP listener.
srv.listenerMutex.Lock()
err := srv.listener.Close()
srv.listenerMutex.Unlock()
if err != nil {
return err
}
// Wait for opened connection to be closed up to Shutdown timeout.
shutdownTimeout := srv.ShutdownTimeout
shutdownTimer := time.NewTimer(shutdownTimeout)
ticker := time.NewTicker(serverShutdownPoll)
defer ticker.Stop()
for {
select {
case <-shutdownTimer.C:
// Write all running goroutines.
tmp, err := os.CreateTemp("", "minio-goroutines-*.txt")
if err == nil {
_ = pprof.Lookup("goroutine").WriteTo(tmp, 1)
tmp.Close()
return errors.New("timed out. some connections are still active. goroutines written to " + tmp.Name())
}
return errors.New("timed out. some connections are still active")
case <-ticker.C:
if atomic.LoadInt32(&srv.requestCount) <= 0 {
return nil
}
}
}
}
// UseShutdownTimeout configure server shutdown timeout
func (srv *Server) UseShutdownTimeout(d time.Duration) *Server {
srv.ShutdownTimeout = d
return srv
}
// UseIdleTimeout configure idle connection timeout
func (srv *Server) UseIdleTimeout(d time.Duration) *Server {
srv.IdleTimeout = d
return srv
}
// UseReadHeaderTimeout configure read header timeout
func (srv *Server) UseReadHeaderTimeout(d time.Duration) *Server {
srv.ReadHeaderTimeout = d
return srv
}
// UseHandler configure final handler for this HTTP *Server
func (srv *Server) UseHandler(h http.Handler) *Server {
srv.Handler = h
return srv
}
// UseTLSConfig pass configured TLSConfig for this HTTP *Server
func (srv *Server) UseTLSConfig(cfg *tls.Config) *Server {
srv.TLSConfig = cfg
return srv
}
// UseBaseContext use custom base context for this HTTP *Server
func (srv *Server) UseBaseContext(ctx context.Context) *Server {
srv.BaseContext = func(listener net.Listener) context.Context {
return ctx
}
return srv
}
// UseCustomLogger use customized logger for this HTTP *Server
func (srv *Server) UseCustomLogger(l *log.Logger) *Server {
srv.ErrorLog = l
return srv
}
// NewServer - creates new HTTP server using given arguments.
func NewServer(addrs []string) *Server {
httpServer := &Server{
Addrs: addrs,
}
// This is not configurable for now.
httpServer.MaxHeaderBytes = DefaultMaxHeaderBytes
return httpServer
}
// SetMinIOVersion -- MinIO version from the main package is set here
func SetMinIOVersion(version string) {
GlobalMinIOVersion = version
}
// SetDeploymentID -- Deployment Id from the main package is set here
func SetDeploymentID(deploymentID string) {
GlobalDeploymentID = deploymentID
}