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Copy pathserver.go
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213 lines (185 loc) · 6.53 KB
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/*
* MinIO Cloud Storage, (C) 2017, 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package http
import (
"crypto/tls"
"errors"
"io/ioutil"
"net/http"
"runtime/pprof"
"sync"
"sync/atomic"
"time"
humanize "github.com/dustin/go-humanize"
"github.com/minio/minio-go/v7/pkg/set"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/cmd/config/api"
"github.com/minio/minio/pkg/certs"
"github.com/minio/minio/pkg/env"
)
const (
serverShutdownPoll = 500 * time.Millisecond
// DefaultShutdownTimeout - default shutdown timeout used for graceful http server shutdown.
DefaultShutdownTimeout = 5 * 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() (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
addrs := set.CreateStringSet(srv.Addrs...).ToSlice() // copy and remove duplicates
// Create new HTTP listener.
var listener *httpListener
listener, err = newHTTPListener(
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.StatusForbidden)
w.Write([]byte(http.ErrServerClosed.Error()))
w.(http.Flusher).Flush()
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 := ioutil.TempFile("", "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
}
}
}
}
// Secure Go implementations of modern TLS ciphers
// The following ciphers are excluded because:
// - RC4 ciphers: RC4 is broken
// - 3DES ciphers: Because of the 64 bit blocksize of DES (Sweet32)
// - CBC-SHA256 ciphers: No countermeasures against Lucky13 timing attack
// - CBC-SHA ciphers: Legacy ciphers (SHA-1) and non-constant time
// implementation of CBC.
// (CBC-SHA ciphers can be enabled again if required)
// - RSA key exchange ciphers: Disabled because of dangerous PKCS1-v1.5 RSA
// padding scheme. See Bleichenbacher attacks.
var secureCipherSuites = []uint16{
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
}
// Go only provides constant-time implementations of Curve25519 and NIST P-256 curve.
var secureCurves = []tls.CurveID{tls.X25519, tls.CurveP256}
// NewServer - creates new HTTP server using given arguments.
func NewServer(addrs []string, handler http.Handler, getCert certs.GetCertificateFunc) *Server {
secureCiphers := env.Get(api.EnvAPISecureCiphers, config.EnableOn) == config.EnableOn
var tlsConfig *tls.Config
if getCert != nil {
tlsConfig = &tls.Config{
// TLS hardening
PreferServerCipherSuites: true,
MinVersion: tls.VersionTLS12,
NextProtos: []string{"h2", "http/1.1"},
}
tlsConfig.GetCertificate = getCert
}
if secureCiphers && tlsConfig != nil {
tlsConfig.CipherSuites = secureCipherSuites
tlsConfig.CurvePreferences = secureCurves
}
httpServer := &Server{
Addrs: addrs,
ShutdownTimeout: DefaultShutdownTimeout,
}
httpServer.Handler = handler
httpServer.TLSConfig = tlsConfig
httpServer.MaxHeaderBytes = DefaultMaxHeaderBytes
return httpServer
}