mirror of
https://gitea.com/Lydanne/buildx.git
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121 lines
4.0 KiB
Go
121 lines
4.0 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package spdy
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"net/http"
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"strings"
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"sync/atomic"
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"time"
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"k8s.io/apimachinery/pkg/util/httpstream"
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"k8s.io/apimachinery/pkg/util/runtime"
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)
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const HeaderSpdy31 = "SPDY/3.1"
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// responseUpgrader knows how to upgrade HTTP responses. It
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// implements the httpstream.ResponseUpgrader interface.
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type responseUpgrader struct {
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pingPeriod time.Duration
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}
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// connWrapper is used to wrap a hijacked connection and its bufio.Reader. All
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// calls will be handled directly by the underlying net.Conn with the exception
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// of Read and Close calls, which will consider data in the bufio.Reader. This
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// ensures that data already inside the used bufio.Reader instance is also
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// read.
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type connWrapper struct {
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net.Conn
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closed int32
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bufReader *bufio.Reader
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}
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func (w *connWrapper) Read(b []byte) (n int, err error) {
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if atomic.LoadInt32(&w.closed) == 1 {
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return 0, io.EOF
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}
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return w.bufReader.Read(b)
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}
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func (w *connWrapper) Close() error {
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err := w.Conn.Close()
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atomic.StoreInt32(&w.closed, 1)
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return err
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}
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// NewResponseUpgrader returns a new httpstream.ResponseUpgrader that is
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// capable of upgrading HTTP responses using SPDY/3.1 via the
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// spdystream package.
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func NewResponseUpgrader() httpstream.ResponseUpgrader {
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return NewResponseUpgraderWithPings(0)
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}
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// NewResponseUpgraderWithPings returns a new httpstream.ResponseUpgrader that
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// is capable of upgrading HTTP responses using SPDY/3.1 via the spdystream
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// package.
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//
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// If pingPeriod is non-zero, for each incoming connection a background
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// goroutine will send periodic Ping frames to the server. Use this to keep
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// idle connections through certain load balancers alive longer.
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func NewResponseUpgraderWithPings(pingPeriod time.Duration) httpstream.ResponseUpgrader {
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return responseUpgrader{pingPeriod: pingPeriod}
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}
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// UpgradeResponse upgrades an HTTP response to one that supports multiplexed
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// streams. newStreamHandler will be called synchronously whenever the
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// other end of the upgraded connection creates a new stream.
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func (u responseUpgrader) UpgradeResponse(w http.ResponseWriter, req *http.Request, newStreamHandler httpstream.NewStreamHandler) httpstream.Connection {
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connectionHeader := strings.ToLower(req.Header.Get(httpstream.HeaderConnection))
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upgradeHeader := strings.ToLower(req.Header.Get(httpstream.HeaderUpgrade))
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if !strings.Contains(connectionHeader, strings.ToLower(httpstream.HeaderUpgrade)) || !strings.Contains(upgradeHeader, strings.ToLower(HeaderSpdy31)) {
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errorMsg := fmt.Sprintf("unable to upgrade: missing upgrade headers in request: %#v", req.Header)
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http.Error(w, errorMsg, http.StatusBadRequest)
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return nil
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}
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hijacker, ok := w.(http.Hijacker)
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if !ok {
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errorMsg := "unable to upgrade: unable to hijack response"
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http.Error(w, errorMsg, http.StatusInternalServerError)
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return nil
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}
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w.Header().Add(httpstream.HeaderConnection, httpstream.HeaderUpgrade)
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w.Header().Add(httpstream.HeaderUpgrade, HeaderSpdy31)
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w.WriteHeader(http.StatusSwitchingProtocols)
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conn, bufrw, err := hijacker.Hijack()
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if err != nil {
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runtime.HandleError(fmt.Errorf("unable to upgrade: error hijacking response: %v", err))
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return nil
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}
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connWithBuf := &connWrapper{Conn: conn, bufReader: bufrw.Reader}
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spdyConn, err := NewServerConnectionWithPings(connWithBuf, newStreamHandler, u.pingPeriod)
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if err != nil {
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runtime.HandleError(fmt.Errorf("unable to upgrade: error creating SPDY server connection: %v", err))
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return nil
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}
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return spdyConn
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}
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