mirror of https://github.com/fatedier/frp.git
104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
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// Copyright 2023 The frp Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package msg
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import (
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"io"
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"reflect"
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)
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func AsyncHandler(f func(Message)) func(Message) {
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return func(m Message) {
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go f(m)
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}
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}
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// Dispatcher is used to send messages to net.Conn or register handlers for messages read from net.Conn.
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type Dispatcher struct {
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rw io.ReadWriter
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sendCh chan Message
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doneCh chan struct{}
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msgHandlers map[reflect.Type]func(Message)
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defaultHandler func(Message)
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}
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func NewDispatcher(rw io.ReadWriter) *Dispatcher {
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return &Dispatcher{
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rw: rw,
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sendCh: make(chan Message, 100),
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doneCh: make(chan struct{}),
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msgHandlers: make(map[reflect.Type]func(Message)),
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}
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}
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// Run will block until io.EOF or some error occurs.
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func (d *Dispatcher) Run() {
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go d.sendLoop()
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go d.readLoop()
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}
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func (d *Dispatcher) sendLoop() {
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for {
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select {
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case <-d.doneCh:
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return
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case m := <-d.sendCh:
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_ = WriteMsg(d.rw, m)
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}
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}
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}
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func (d *Dispatcher) readLoop() {
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for {
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m, err := ReadMsg(d.rw)
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if err != nil {
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close(d.doneCh)
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return
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}
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if handler, ok := d.msgHandlers[reflect.TypeOf(m)]; ok {
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handler(m)
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} else if d.defaultHandler != nil {
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d.defaultHandler(m)
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}
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}
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}
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func (d *Dispatcher) Send(m Message) error {
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select {
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case <-d.doneCh:
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return io.EOF
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case d.sendCh <- m:
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return nil
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}
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}
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func (d *Dispatcher) SendChannel() chan Message {
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return d.sendCh
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}
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func (d *Dispatcher) RegisterHandler(msg Message, handler func(Message)) {
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d.msgHandlers[reflect.TypeOf(msg)] = handler
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}
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func (d *Dispatcher) RegisterDefaultHandler(handler func(Message)) {
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d.defaultHandler = handler
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}
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func (d *Dispatcher) Done() chan struct{} {
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return d.doneCh
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}
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