/
utils.go
217 lines (197 loc) · 4.16 KB
/
utils.go
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/*
* Copyright (C) 2022 The "MysteriumNetwork/node" Authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package proxyclient
import (
"bufio"
"context"
"errors"
"io"
"net"
"net/http"
"sync"
"time"
)
const copyBufferSize = 128 * 1024
var bufferPool = NewBufferPool(copyBufferSize)
func proxyHTTP1(ctx context.Context, left, right net.Conn) {
wg := sync.WaitGroup{}
idleTimeout := 5 * time.Minute
timeout := time.AfterFunc(idleTimeout, func() {
left.Close()
right.Close()
})
extend := func() {
timeout.Reset(idleTimeout)
}
cpy := func(dst, src net.Conn) {
defer wg.Done()
copyBuffer(dst, src, extend)
dst.Close()
}
wg.Add(2)
go cpy(left, right)
go cpy(right, left)
groupDone := make(chan struct{}, 1)
go func() {
wg.Wait()
groupDone <- struct{}{}
}()
select {
case <-ctx.Done():
left.Close()
right.Close()
case <-groupDone:
return
}
<-groupDone
return
}
func proxyHTTP2(ctx context.Context, leftreader io.ReadCloser, leftwriter io.Writer, right net.Conn) {
wg := sync.WaitGroup{}
idleTimeout := 5 * time.Minute
timeout := time.AfterFunc(idleTimeout, func() {
leftreader.Close()
right.Close()
})
extend := func() {
timeout.Reset(idleTimeout)
}
ltr := func(dst net.Conn, src io.Reader) {
defer wg.Done()
copyBuffer(dst, src, extend)
dst.Close()
}
rtl := func(dst io.Writer, src io.Reader) {
defer wg.Done()
copyBody(dst, src)
}
wg.Add(2)
go ltr(right, leftreader)
go rtl(leftwriter, right)
groupDone := make(chan struct{}, 1)
go func() {
wg.Wait()
groupDone <- struct{}{}
}()
select {
case <-ctx.Done():
leftreader.Close()
right.Close()
case <-groupDone:
return
}
<-groupDone
return
}
// Hop-by-hop headers. These are removed when sent to the backend.
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html
var hopHeaders = []string{
"Connection",
"Keep-Alive",
"Proxy-Authenticate",
"Proxy-Connection",
"Proxy-Authorization",
"Te", // canonicalized version of "TE"
"Trailers",
"Transfer-Encoding",
"Upgrade",
}
func copyHeader(dst, src http.Header) {
for k, vv := range src {
for _, v := range vv {
dst.Add(k, v)
}
}
}
func delHopHeaders(header http.Header) {
for _, h := range hopHeaders {
header.Del(h)
}
}
func hijack(hijackable interface{}) (net.Conn, *bufio.ReadWriter, error) {
hj, ok := hijackable.(http.Hijacker)
if !ok {
return nil, nil, errors.New("connection does not support hijacking")
}
conn, rw, err := hj.Hijack()
if err != nil {
return nil, nil, err
}
var emptyTime time.Time
err = conn.SetDeadline(emptyTime)
if err != nil {
conn.Close()
return nil, nil, err
}
return conn, rw, nil
}
func flush(flusher interface{}) bool {
f, ok := flusher.(http.Flusher)
if !ok {
return false
}
f.Flush()
return true
}
func copyBody(wr io.Writer, body io.Reader) {
buf := bufferPool.Get()
defer bufferPool.Put(buf)
for {
bread, readErr := body.Read(buf)
var writeErr error
if bread > 0 {
_, writeErr = wr.Write(buf[:bread])
flush(wr)
}
if readErr != nil || writeErr != nil {
break
}
}
}
func copyBuffer(dst io.Writer, src io.Reader, extend func()) (written int64, err error) {
buf := bufferPool.Get()
defer bufferPool.Put(buf)
for {
extend()
nr, er := src.Read(buf)
if nr > 0 {
nw, ew := dst.Write(buf[0:nr])
if nw < 0 || nr < nw {
nw = 0
if ew == nil {
ew = errors.New("invalid write result")
}
}
written += int64(nw)
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er != nil {
if er != io.EOF {
err = er
}
break
}
}
return written, err
}