frp/pkg/transport/message.go

122 lines
3.2 KiB
Go

// Copyright 2023 The frp Authors
//
// 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 transport
import (
"context"
"reflect"
"sync"
"github.com/fatedier/golib/errors"
"github.com/fatedier/frp/pkg/msg"
)
type MessageTransporter interface {
Send(msg.Message) error
// Recv(ctx context.Context, laneKey string, msgType string) (Message, error)
// Do will first send msg, then recv msg with the same laneKey and specified msgType.
Do(ctx context.Context, req msg.Message, laneKey, recvMsgType string) (msg.Message, error)
// Dispatch will dispatch message to related channel registered in Do function by its message type and laneKey.
Dispatch(m msg.Message, laneKey string) bool
// Same with Dispatch but with specified message type.
DispatchWithType(m msg.Message, msgType, laneKey string) bool
}
func NewMessageTransporter(sendCh chan msg.Message) MessageTransporter {
return &transporterImpl{
sendCh: sendCh,
registry: make(map[string]map[string]chan msg.Message),
}
}
type transporterImpl struct {
sendCh chan msg.Message
// First key is message type and second key is lane key.
// Dispatch will dispatch message to related channel by its message type
// and lane key.
registry map[string]map[string]chan msg.Message
mu sync.RWMutex
}
func (impl *transporterImpl) Send(m msg.Message) error {
return errors.PanicToError(func() {
impl.sendCh <- m
})
}
func (impl *transporterImpl) Do(ctx context.Context, req msg.Message, laneKey, recvMsgType string) (msg.Message, error) {
ch := make(chan msg.Message, 1)
defer close(ch)
unregisterFn := impl.registerMsgChan(ch, laneKey, recvMsgType)
defer unregisterFn()
if err := impl.Send(req); err != nil {
return nil, err
}
select {
case <-ctx.Done():
return nil, ctx.Err()
case resp := <-ch:
return resp, nil
}
}
func (impl *transporterImpl) DispatchWithType(m msg.Message, msgType, laneKey string) bool {
var ch chan msg.Message
impl.mu.RLock()
byLaneKey, ok := impl.registry[msgType]
if ok {
ch = byLaneKey[laneKey]
}
impl.mu.RUnlock()
if ch == nil {
return false
}
if err := errors.PanicToError(func() {
ch <- m
}); err != nil {
return false
}
return true
}
func (impl *transporterImpl) Dispatch(m msg.Message, laneKey string) bool {
msgType := reflect.TypeOf(m).Elem().Name()
return impl.DispatchWithType(m, msgType, laneKey)
}
func (impl *transporterImpl) registerMsgChan(recvCh chan msg.Message, laneKey string, msgType string) (unregister func()) {
impl.mu.Lock()
byLaneKey, ok := impl.registry[msgType]
if !ok {
byLaneKey = make(map[string]chan msg.Message)
impl.registry[msgType] = byLaneKey
}
byLaneKey[laneKey] = recvCh
impl.mu.Unlock()
unregister = func() {
impl.mu.Lock()
delete(byLaneKey, laneKey)
impl.mu.Unlock()
}
return
}