frp/client/visitor_manager.go

144 lines
3.1 KiB
Go

// 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 client
import (
"context"
"sync"
"time"
"github.com/fatedier/frp/pkg/config"
"github.com/fatedier/frp/pkg/util/xlog"
)
type VisitorManager struct {
ctl *Control
cfgs map[string]config.VisitorConf
visitors map[string]Visitor
checkInterval time.Duration
mu sync.Mutex
ctx context.Context
stopCh chan struct{}
}
func NewVisitorManager(ctx context.Context, ctl *Control) *VisitorManager {
return &VisitorManager{
ctl: ctl,
cfgs: make(map[string]config.VisitorConf),
visitors: make(map[string]Visitor),
checkInterval: 10 * time.Second,
ctx: ctx,
stopCh: make(chan struct{}),
}
}
func (vm *VisitorManager) Run() {
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.GetBaseInfo().ProxyName
if _, exist := vm.visitors[name]; !exist {
xl.Info("try to start visitor [%s]", name)
_ = vm.startVisitor(cfg)
}
}
vm.mu.Unlock()
}
}
}
// Hold lock before calling this function.
func (vm *VisitorManager) startVisitor(cfg config.VisitorConf) (err error) {
xl := xlog.FromContextSafe(vm.ctx)
name := cfg.GetBaseInfo().ProxyName
visitor := NewVisitor(vm.ctx, vm.ctl, cfg)
err = visitor.Run()
if err != nil {
xl.Warn("start error: %v", err)
} else {
vm.visitors[name] = visitor
xl.Info("start visitor success")
}
return
}
func (vm *VisitorManager) Reload(cfgs map[string]config.VisitorConf) {
xl := xlog.FromContextSafe(vm.ctx)
vm.mu.Lock()
defer vm.mu.Unlock()
delNames := make([]string, 0)
for name, oldCfg := range vm.cfgs {
del := false
cfg, ok := cfgs[name]
if !ok {
del = true
} else if !oldCfg.Compare(cfg) {
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)
}
}
if len(delNames) > 0 {
xl.Info("visitor removed: %v", delNames)
}
addNames := make([]string, 0)
for name, cfg := range cfgs {
if _, ok := vm.cfgs[name]; !ok {
vm.cfgs[name] = cfg
addNames = append(addNames, name)
_ = vm.startVisitor(cfg)
}
}
if len(addNames) > 0 {
xl.Info("visitor added: %v", addNames)
}
}
func (vm *VisitorManager) Close() {
vm.mu.Lock()
defer vm.mu.Unlock()
for _, v := range vm.visitors {
v.Close()
}
select {
case <-vm.stopCh:
default:
close(vm.stopCh)
}
}