frp/vendor/github.com/fatedier/golib/net/mux/mux.go

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// Copyright 2018 fatedier, fatedier@gmail.com
//
// 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 mux
import (
"fmt"
"io"
"net"
"sort"
"sync"
"time"
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"github.com/fatedier/golib/errors"
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gnet "github.com/fatedier/golib/net"
)
const (
// DefaultTimeout is the default length of time to wait for bytes we need.
DefaultTimeout = 10 * time.Second
)
type Mux struct {
ln net.Listener
defaultLn *listener
lns []*listener
maxNeedBytesNum uint32
mu sync.RWMutex
}
func NewMux() (mux *Mux) {
mux = &Mux{
lns: make([]*listener, 0),
}
return
}
func (mux *Mux) Listen(priority int, needBytesNum uint32, fn MatchFunc) net.Listener {
ln := &listener{
c: make(chan net.Conn),
mux: mux,
needBytesNum: needBytesNum,
matchFn: fn,
}
mux.mu.Lock()
defer mux.mu.Unlock()
if needBytesNum > mux.maxNeedBytesNum {
mux.maxNeedBytesNum = needBytesNum
}
newlns := append(mux.copyLns(), ln)
sort.Slice(newlns, func(i, j int) bool {
return newlns[i].needBytesNum < newlns[j].needBytesNum
})
mux.lns = newlns
return ln
}
func (mux *Mux) ListenHttp(priority int) net.Listener {
return mux.Listen(priority, HttpNeedBytesNum, HttpMatchFunc)
}
func (mux *Mux) ListenHttps(priority int) net.Listener {
return mux.Listen(priority, HttpsNeedBytesNum, HttpsMatchFunc)
}
func (mux *Mux) DefaultListener() net.Listener {
mux.mu.Lock()
defer mux.mu.Unlock()
if mux.defaultLn == nil {
mux.defaultLn = &listener{
c: make(chan net.Conn),
mux: mux,
}
}
return mux.defaultLn
}
func (mux *Mux) release(ln *listener) bool {
result := false
mux.mu.Lock()
defer mux.mu.Unlock()
lns := mux.copyLns()
for i, l := range lns {
if l == ln {
lns = append(lns[:i], lns[i+1:]...)
result = true
}
}
mux.lns = lns
return result
}
func (mux *Mux) copyLns() []*listener {
lns := make([]*listener, 0, len(mux.lns))
for _, l := range mux.lns {
lns = append(lns, l)
}
return lns
}
// Serve handles connections from ln and multiplexes then across registered listeners.
func (mux *Mux) Serve(ln net.Listener) error {
mux.mu.Lock()
mux.ln = ln
mux.mu.Unlock()
for {
// Wait for the next connection.
// If it returns a temporary error then simply retry.
// If it returns any other error then exit immediately.
conn, err := ln.Accept()
if err, ok := err.(interface {
Temporary() bool
}); ok && err.Temporary() {
continue
}
if err != nil {
return err
}
go mux.handleConn(conn)
}
}
func (mux *Mux) handleConn(conn net.Conn) {
mux.mu.RLock()
maxNeedBytesNum := mux.maxNeedBytesNum
lns := mux.lns
defaultLn := mux.defaultLn
mux.mu.RUnlock()
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sharedConn, rd := gnet.NewSharedConnSize(conn, int(maxNeedBytesNum))
data := make([]byte, maxNeedBytesNum)
conn.SetReadDeadline(time.Now().Add(DefaultTimeout))
_, err := io.ReadFull(rd, data)
if err != nil {
conn.Close()
return
}
conn.SetReadDeadline(time.Time{})
for _, ln := range lns {
if match := ln.matchFn(data); match {
err = errors.PanicToError(func() {
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ln.c <- sharedConn
})
if err != nil {
conn.Close()
}
return
}
}
// No match listeners
if defaultLn != nil {
err = errors.PanicToError(func() {
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defaultLn.c <- sharedConn
})
if err != nil {
conn.Close()
}
return
}
// No listeners for this connection, close it.
conn.Close()
return
}
type listener struct {
mux *Mux
needBytesNum uint32
matchFn MatchFunc
c chan net.Conn
mu sync.RWMutex
}
// Accept waits for and returns the next connection to the listener.
func (ln *listener) Accept() (net.Conn, error) {
conn, ok := <-ln.c
if !ok {
return nil, fmt.Errorf("network connection closed")
}
return conn, nil
}
// Close removes this listener from the parent mux and closes the channel.
func (ln *listener) Close() error {
if ok := ln.mux.release(ln); ok {
// Close done to signal to any RLock holders to release their lock.
close(ln.c)
}
return nil
}
func (ln *listener) Addr() net.Addr {
if ln.mux == nil {
return nil
}
ln.mux.mu.RLock()
defer ln.mux.mu.RUnlock()
if ln.mux.ln == nil {
return nil
}
return ln.mux.ln.Addr()
}