/
upgrade.go
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/
upgrade.go
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// Copyright 2021-2024 antlabs. All rights reserved.
//
// 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 quickws
import (
"bufio"
"bytes"
"net"
"net/http"
"time"
"github.com/antlabs/wsutil/bufio2"
"github.com/antlabs/wsutil/bytespool"
"github.com/antlabs/wsutil/fixedreader"
)
type UpgradeServer struct {
config Config
}
func NewUpgrade(opts ...ServerOption) *UpgradeServer {
var conf ConnOption
if err := conf.defaultSetting(); err != nil {
panic(err.Error())
}
for _, o := range opts {
o(&conf)
}
return &UpgradeServer{config: conf.Config}
}
func (u *UpgradeServer) Upgrade(w http.ResponseWriter, r *http.Request) (c *Conn, err error) {
return upgradeInner(w, r, &u.config)
}
func Upgrade(w http.ResponseWriter, r *http.Request, opts ...ServerOption) (c *Conn, err error) {
var conf ConnOption
if err := conf.defaultSetting(); err != nil {
return nil, err
}
for _, o := range opts {
o(&conf)
}
return upgradeInner(w, r, &conf.Config)
}
func upgradeInner(w http.ResponseWriter, r *http.Request, conf *Config) (c *Conn, err error) {
if ecode, err := checkRequest(r); err != nil {
http.Error(w, err.Error(), ecode)
return nil, err
}
hi, ok := w.(http.Hijacker)
if !ok {
return nil, ErrNotFoundHijacker
}
var read *bufio.Reader
var conn net.Conn
var rw *bufio.ReadWriter
if conf.parseMode == ParseModeWindows {
// 这里不需要rw,直接使用conn
conn, rw, err = hi.Hijack()
if !conf.disableBufioClearHack {
bufio2.ClearReadWriter(rw)
}
// TODO
// rsp.ClearRsp(w)
rw = nil
} else {
var rw *bufio.ReadWriter
conn, rw, err = hi.Hijack()
read = rw.Reader
rw = nil
}
if err != nil {
return nil, err
}
// 是否打开解压缩
// 外层接收压缩, 并且客户端发送扩展过来
if conf.decompression {
conf.decompression = needDecompression(r.Header)
}
buf := bytespool.GetUpgradeRespBytes()
tmpWriter := bytes.NewBuffer((*buf)[:0])
defer func() {
bytespool.PutUpgradeRespBytes(buf)
tmpWriter = nil
}()
if err = prepareWriteResponse(r, tmpWriter, conf); err != nil {
return
}
if _, err := conn.Write(tmpWriter.Bytes()); err != nil {
return nil, err
}
var fr fixedreader.FixedReader
var bp bytespool.BytesPool
bp.Init()
if conf.parseMode == ParseModeWindows {
fr.Init(conn, bytespool.GetBytes(conf.initPayloadSize()))
}
conn.SetDeadline(time.Time{})
return newConn(conn, false, conf, fr, read, bp), nil
}