frp/client/visitor/visitor_manager.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 visitor
import (
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"context"
"fmt"
"net"
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"reflect"
"sync"
"time"
"github.com/samber/lo"
v1 "github.com/fatedier/frp/pkg/config/v1"
"github.com/fatedier/frp/pkg/transport"
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"github.com/fatedier/frp/pkg/util/xlog"
)
type Manager struct {
clientCfg *v1.ClientCommonConfig
cfgs map[string]v1.VisitorConfigurer
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visitors map[string]Visitor
helper Helper
checkInterval time.Duration
mu sync.RWMutex
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ctx context.Context
stopCh chan struct{}
}
func NewManager(
ctx context.Context,
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runID string,
clientCfg *v1.ClientCommonConfig,
connectServer func() (net.Conn, error),
msgTransporter transport.MessageTransporter,
) *Manager {
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m := &Manager{
clientCfg: clientCfg,
cfgs: make(map[string]v1.VisitorConfigurer),
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visitors: make(map[string]Visitor),
checkInterval: 10 * time.Second,
ctx: ctx,
stopCh: make(chan struct{}),
}
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m.helper = &visitorHelperImpl{
connectServerFn: connectServer,
msgTransporter: msgTransporter,
transferConnFn: m.TransferConn,
runID: runID,
}
return m
}
func (vm *Manager) Run() {
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xl := xlog.FromContextSafe(vm.ctx)
ticker := time.NewTicker(vm.checkInterval)
defer ticker.Stop()
for {
select {
case <-vm.stopCh:
xl.Info("gracefully shutdown visitor manager")
return
case <-ticker.C:
vm.mu.Lock()
for _, cfg := range vm.cfgs {
name := cfg.GetBaseConfig().Name
if _, exist := vm.visitors[name]; !exist {
xl.Info("try to start visitor [%s]", name)
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_ = vm.startVisitor(cfg)
}
}
vm.mu.Unlock()
}
}
}
func (vm *Manager) Close() {
vm.mu.Lock()
defer vm.mu.Unlock()
for _, v := range vm.visitors {
v.Close()
}
select {
case <-vm.stopCh:
default:
close(vm.stopCh)
}
}
// Hold lock before calling this function.
func (vm *Manager) startVisitor(cfg v1.VisitorConfigurer) (err error) {
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xl := xlog.FromContextSafe(vm.ctx)
name := cfg.GetBaseConfig().Name
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visitor := NewVisitor(vm.ctx, cfg, vm.clientCfg, vm.helper)
err = visitor.Run()
if err != nil {
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xl.Warn("start error: %v", err)
} else {
vm.visitors[name] = visitor
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xl.Info("start visitor success")
}
return
}
func (vm *Manager) Reload(cfgs []v1.VisitorConfigurer) {
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xl := xlog.FromContextSafe(vm.ctx)
cfgsMap := lo.KeyBy(cfgs, func(c v1.VisitorConfigurer) string {
return c.GetBaseConfig().Name
})
vm.mu.Lock()
defer vm.mu.Unlock()
delNames := make([]string, 0)
for name, oldCfg := range vm.cfgs {
del := false
cfg, ok := cfgsMap[name]
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if !ok || !reflect.DeepEqual(oldCfg, cfg) {
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del = true
}
if del {
delNames = append(delNames, name)
delete(vm.cfgs, name)
if visitor, ok := vm.visitors[name]; ok {
visitor.Close()
}
delete(vm.visitors, name)
}
}
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if len(delNames) > 0 {
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xl.Info("visitor removed: %v", delNames)
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}
addNames := make([]string, 0)
for _, cfg := range cfgs {
name := cfg.GetBaseConfig().Name
if _, ok := vm.cfgs[name]; !ok {
vm.cfgs[name] = cfg
addNames = append(addNames, name)
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_ = vm.startVisitor(cfg)
}
}
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if len(addNames) > 0 {
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xl.Info("visitor added: %v", addNames)
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}
}
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// TransferConn transfers a connection to a visitor.
func (vm *Manager) TransferConn(name string, conn net.Conn) error {
vm.mu.RLock()
defer vm.mu.RUnlock()
v, ok := vm.visitors[name]
if !ok {
return fmt.Errorf("visitor [%s] not found", name)
}
return v.AcceptConn(conn)
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}
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type visitorHelperImpl struct {
connectServerFn func() (net.Conn, error)
msgTransporter transport.MessageTransporter
transferConnFn func(name string, conn net.Conn) error
runID string
}
func (v *visitorHelperImpl) ConnectServer() (net.Conn, error) {
return v.connectServerFn()
}
func (v *visitorHelperImpl) TransferConn(name string, conn net.Conn) error {
return v.transferConnFn(name, conn)
}
func (v *visitorHelperImpl) MsgTransporter() transport.MessageTransporter {
return v.msgTransporter
}
func (v *visitorHelperImpl) RunID() string {
return v.runID
}