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ConnectManager.go
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ConnectManager.go
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package conn
import (
"github.com/astaxie/beego/logs"
"github.com/pkg/errors"
"net"
"sync"
"sync/atomic"
"time"
)
const (
maxRetryDuration = time.Minute * 5
defaultRetryDuration = time.Second * 5
defaultTargetOutbound = uint32(8)
maxFailedAttempts = 25
)
var log = logs.NewLogger()
type ConnectManager struct {
connRequestCount uint64
start int32
stop int32
listener *ConnectListener
waitGroup sync.WaitGroup
failedAttempts uint64
requests chan interface{}
quit chan struct{}
}
type handleConnected struct {
connectRequest *ConnectRequest
conn net.Conn
}
type handleDisconnected struct {
id uint64
retry bool
}
type handleFailed struct {
connectRequest *ConnectRequest
err error
}
func (connectManager *ConnectManager) handleFailedConnect(connectRequest *ConnectRequest) {
if atomic.LoadInt32(&connectManager.stop) != 0 {
return
}
if connectRequest.Permanent {
connectRequest.retryCount++
duration := time.Duration(connectRequest.retryCount) * connectManager.listener.RetryDuration
if duration > maxRetryDuration {
duration = maxRetryDuration
}
log.Debug("Retrying connection to %v in %v", connectRequest, duration)
time.AfterFunc(duration, func() {
connectManager.Connect(connectRequest)
})
} else if connectManager.listener.GetNewAddress != nil {
connectManager.failedAttempts++
if connectManager.failedAttempts >= maxFailedAttempts {
log.Debug("max failed connection attemps reached :[%d]--retyeing connection in:%v",
maxFailedAttempts, connectManager.listener.RetryDuration)
time.AfterFunc(connectManager.listener.RetryDuration, func() {
connectManager.NewConnectRequest()
})
} else {
go connectManager.NewConnectRequest()
}
}
}
func (connectManager *ConnectManager) Connect(connectRequest *ConnectRequest) {
if atomic.LoadInt32(&connectManager.stop) != 0 {
return
}
if atomic.LoadUint64(&connectRequest.id) == 0 {
atomic.StoreUint64(&connectRequest.id, atomic.AddUint64(&connectManager.connRequestCount, 1))
}
log.Debug("attempting to conn to %v ", connectRequest)
conn, err := connectManager.listener.Dial(connectRequest.Address)
if err != nil {
connectManager.requests <- handleFailed{connectRequest, err}
} else {
connectManager.requests <- handleConnected{connectRequest, conn}
}
}
func (connectManager *ConnectManager) Disconnect(id uint64) {
if atomic.LoadInt32(&connectManager.stop) != 0 {
return
}
connectManager.requests <- handleDisconnected{id, true}
}
func (connectManager *ConnectManager) Remove(id uint64) {
if atomic.LoadInt32(&connectManager.stop) != 0 {
return
}
connectManager.requests <- handleDisconnected{id, false}
}
func (connectManager *ConnectManager) listenHandler(listener net.Listener) {
log.Info("server listening on %s", listener.Addr())
for atomic.LoadInt32(&connectManager.stop) == 0 {
conn, err := listener.Accept()
if err != nil {
if atomic.LoadInt32(&connectManager.stop) == 0 {
log.Error("Can't accept connection :%v", err)
}
continue
}
go connectManager.listener.OnAccept(conn)
}
connectManager.waitGroup.Done()
log.Trace("Listener handler done for %s", listener.Addr())
}
func (connectManager *ConnectManager) NewConnectRequest() {
//if atomic.LoadInt32(&connectManager.stop) != 0 {
// return
//}
log.Debug("NewConnectRequest ")
if connectManager.listener.GetNewAddress == nil {
return
}
connectRequest := &ConnectRequest{}
atomic.StoreUint64(&connectRequest.id, atomic.AddUint64(&connectManager.connRequestCount, 1))
address, err := connectManager.listener.GetNewAddress()
log.Debug("NewConnectRequest :%s", address)
if err != nil {
connectManager.requests <- handleFailed{connectRequest, err}
return
}
connectRequest.Address = address
connectManager.Connect(connectRequest)
}
func (connectManager *ConnectManager) connectHandler() {
conns := make(map[uint64]*ConnectRequest, connectManager.listener.TargetOutbound)
out:
for {
select {
case request := <-connectManager.requests:
switch msg := request.(type) {
case handleConnected:
connectRequest := msg.connectRequest
connectRequest.updateState(ConnectEstablished)
connectRequest.Conn = msg.conn
conns[connectRequest.id] = connectRequest
log.Debug("connected to %v", connectRequest)
connectRequest.retryCount = 0
connectManager.failedAttempts = 0
if connectManager.listener.OnConnection != nil {
go connectManager.listener.OnConnection(connectRequest, msg.conn)
}
case handleDisconnected:
if connectRequest, ok := conns[msg.id]; ok {
connectRequest.updateState(ConnectDisconnected)
if connectRequest.Conn != nil {
connectRequest.Conn.Close()
}
log.Debug("Disconnected from %v", connectRequest)
delete(conns, msg.id)
if connectManager.listener.OnDisconnection != nil {
go connectManager.listener.OnDisconnection(connectRequest)
}
if uint32(len(conns)) < connectManager.listener.TargetOutbound && msg.retry {
connectManager.handleFailedConnect(connectRequest)
}
} else {
log.Error("unknown connectiong :%d", msg.id)
}
case handleFailed:
connectRequest := msg.connectRequest
connectRequest.updateState(ConnectFailed)
log.Debug("failed to conn to %v :%v", connectRequest, msg.err)
connectManager.handleFailedConnect(connectRequest)
}
case <-connectManager.quit:
break out
}
}
}
func (connectManager *ConnectManager) Start() {
if atomic.AddInt32(&connectManager.start, 1) != 1 {
log.Trace("Connection manager return")
return
}
log.Trace("Connection manager started")
connectManager.waitGroup.Add(1)
go connectManager.connectHandler()
log.Trace("Connection manager connectHandler")
if connectManager.listener.OnAccept != nil {
for _, listener := range connectManager.listener.Listeners {
connectManager.waitGroup.Add(1)
go connectManager.listenHandler(listener)
}
}
for i := atomic.LoadUint64(&connectManager.connRequestCount); i < uint64(connectManager.listener.TargetOutbound); i++ {
log.Trace("Connection manager NewConnectRequest")
go connectManager.NewConnectRequest()
}
}
func (connectManager *ConnectManager) Wait() {
connectManager.waitGroup.Wait()
}
func (connectManager *ConnectManager) Stop() {
if atomic.AddInt32(&connectManager.stop, 1) != 1 {
log.Warn("connection manager already stopped")
return
}
for _, listener := range connectManager.listener.Listeners {
_ = listener.Close()
}
close(connectManager.quit)
log.Trace("connection manager stopped")
}
func NewConnectManager(listener *ConnectListener) (*ConnectManager, error) {
if listener.Dial == nil {
return nil, errors.New("dial can't be nil")
}
if listener.RetryDuration <= 0 {
listener.RetryDuration = defaultRetryDuration
}
if listener.TargetOutbound == 0 {
listener.TargetOutbound = defaultTargetOutbound
}
connectManager := ConnectManager{
listener: listener,
requests: make(chan interface{}),
quit: make(chan struct{}),
}
return &connectManager, nil
}