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server_tcp_special.go
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server_tcp_special.go
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package modbus
import (
"context"
"crypto/tls"
"errors"
"math/rand"
"net"
"net/url"
"strings"
"sync"
"sync/atomic"
"time"
)
// defined default value
const (
DefaultConnectTimeout = 15 * time.Second
DefaultReconnectInterval = 1 * time.Minute
DefaultKeepAliveInterval = 30 * time.Second
)
const (
initial uint32 = iota
disconnected
connected
)
// OnConnectHandler when connected it will be call
type OnConnectHandler func(c *TCPServerSpecial) error
// OnConnectionLostHandler when Connection lost it will be call
type OnConnectionLostHandler func(c *TCPServerSpecial)
// OnKeepAliveHandler keep alive function
type OnKeepAliveHandler func(c *TCPServerSpecial)
// TCPServerSpecial modbus tcp server special
type TCPServerSpecial struct {
ServerSession
server *url.URL // 连接的服务器端
TLSConfig *tls.Config
rwMux sync.RWMutex
status uint32 // 状态
autoReconnect bool // 是否启动重连
enableKeepAlive bool // 是否使能心跳包
connectTimeout time.Duration // 连接超时时间
reconnectInterval time.Duration // 重连间隔时间
keepAliveInterval time.Duration // 心跳包间隔
onConnect OnConnectHandler // 连接回调
onConnectionLost OnConnectionLostHandler // 失连回调
onKeepAlive OnKeepAliveHandler // 保活函数
cancel context.CancelFunc // cancel
}
// NewTCPServerSpecial new tcp server special, default enable auto reconnect
func NewTCPServerSpecial() *TCPServerSpecial {
return &TCPServerSpecial{
ServerSession: ServerSession{
readTimeout: TCPDefaultReadTimeout,
writeTimeout: TCPDefaultWriteTimeout,
serverCommon: newServerCommon(),
logger: newLogger("modbusTCPServerSpec => "),
},
autoReconnect: true,
enableKeepAlive: false,
connectTimeout: DefaultConnectTimeout,
reconnectInterval: DefaultReconnectInterval,
keepAliveInterval: DefaultKeepAliveInterval,
onKeepAlive: func(*TCPServerSpecial) {},
onConnect: func(*TCPServerSpecial) error { return nil },
onConnectionLost: func(*TCPServerSpecial) {},
}
}
// UnderlyingConn got underlying tcp conn
func (sf *TCPServerSpecial) UnderlyingConn() net.Conn {
return sf.conn
}
// SetConnectTimeout set tcp connect the host timeout
func (sf *TCPServerSpecial) SetConnectTimeout(t time.Duration) *TCPServerSpecial {
sf.connectTimeout = t
return sf
}
// SetReconnectInterval set tcp reconnect the host interval when connect failed after try
func (sf *TCPServerSpecial) SetReconnectInterval(t time.Duration) *TCPServerSpecial {
sf.reconnectInterval = t
return sf
}
// EnableAutoReconnect enable auto reconnect
func (sf *TCPServerSpecial) EnableAutoReconnect(b bool) *TCPServerSpecial {
sf.autoReconnect = b
return sf
}
// SetTLSConfig set tls config
func (sf *TCPServerSpecial) SetTLSConfig(t *tls.Config) *TCPServerSpecial {
sf.TLSConfig = t
return sf
}
// SetReadTimeout set read timeout
func (sf *TCPServerSpecial) SetReadTimeout(t time.Duration) *TCPServerSpecial {
sf.readTimeout = t
return sf
}
// SetWriteTimeout set write timeout
func (sf *TCPServerSpecial) SetWriteTimeout(t time.Duration) *TCPServerSpecial {
sf.writeTimeout = t
return sf
}
// SetOnConnectHandler set on connect handler
func (sf *TCPServerSpecial) SetOnConnectHandler(f OnConnectHandler) *TCPServerSpecial {
if f != nil {
sf.onConnect = f
}
return sf
}
// SetConnectionLostHandler set connection lost handler
func (sf *TCPServerSpecial) SetConnectionLostHandler(f OnConnectionLostHandler) *TCPServerSpecial {
if f != nil {
sf.onConnectionLost = f
}
return sf
}
// SetKeepAlive set keep alive enable, alive time and handler
func (sf *TCPServerSpecial) SetKeepAlive(enable bool, t time.Duration, f OnKeepAliveHandler) *TCPServerSpecial {
sf.enableKeepAlive = enable
if t > 0 {
sf.keepAliveInterval = t
}
if f != nil {
sf.onKeepAlive = f
}
return sf
}
// AddRemoteServer adds a broker URI to the list of brokers to be used.
// The format should be scheme://host:port
// Default values for hostname is "127.0.0.1", for schema is "tcp://".
// An example broker URI would look like: tcp://foobar.com:502
func (sf *TCPServerSpecial) AddRemoteServer(server string) error {
if len(server) > 0 && server[0] == ':' {
server = "127.0.0.1" + server
}
if !strings.Contains(server, "://") {
server = "tcp://" + server
}
remoteURL, err := url.Parse(server)
if err != nil {
return err
}
sf.server = remoteURL
return nil
}
// Start start the server,and return quickly,if it nil,the server will connecting background,other failed
func (sf *TCPServerSpecial) Start() error {
if sf.server == nil {
return errors.New("empty remote server address,add it first")
}
go sf.run()
return nil
}
// 增加间隔
func (sf *TCPServerSpecial) run() {
var ctx context.Context
sf.rwMux.Lock()
if !atomic.CompareAndSwapUint32(&sf.status, initial, disconnected) {
sf.rwMux.Unlock()
return
}
ctx, sf.cancel = context.WithCancel(context.Background())
sf.rwMux.Unlock()
defer func() {
sf.setConnectStatus(initial)
sf.Debugf("tcp server special stop!")
}()
sf.Debugf("tcp server special start!")
for {
select {
case <-ctx.Done():
return
default:
}
sf.Debugf("connecting server %+v", sf.server)
conn, err := openConnection(sf.server, sf.TLSConfig, sf.connectTimeout)
if err != nil {
sf.Errorf("connect failed, %v", err)
if !sf.autoReconnect {
return
}
time.Sleep(sf.reconnectInterval)
continue
}
sf.Debugf("connect success")
sf.conn = conn
if err := sf.onConnect(sf); err != nil {
time.Sleep(sf.reconnectInterval)
continue
}
stopKeepAlive := make(chan struct{})
if sf.enableKeepAlive {
go func() {
tick := time.NewTicker(sf.keepAliveInterval)
defer tick.Stop()
for {
select {
case <-ctx.Done():
return
case <-stopKeepAlive:
return
case <-tick.C:
sf.onKeepAlive(sf)
}
}
}()
}
sf.setConnectStatus(connected)
sf.running(ctx)
sf.setConnectStatus(disconnected)
sf.onConnectionLost(sf)
close(stopKeepAlive)
select {
case <-ctx.Done():
return
default:
// 随机500ms-1s的重试,避免快速重试造成服务器许多无效连接
time.Sleep(time.Millisecond * time.Duration(500+rand.Intn(500)))
}
}
}
// IsConnected check connect is online
func (sf *TCPServerSpecial) IsConnected() bool {
return sf.connectStatus() == connected
}
// IsClosed check server is closed
func (sf *TCPServerSpecial) IsClosed() bool {
return sf.connectStatus() == initial
}
// Close close the server
func (sf *TCPServerSpecial) Close() error {
sf.rwMux.Lock()
if sf.cancel != nil {
sf.cancel()
}
sf.rwMux.Unlock()
return nil
}
func (sf *TCPServerSpecial) setConnectStatus(status uint32) {
sf.rwMux.Lock()
atomic.StoreUint32(&sf.status, status)
sf.rwMux.Unlock()
}
func (sf *TCPServerSpecial) connectStatus() uint32 {
sf.rwMux.RLock()
status := atomic.LoadUint32(&sf.status)
sf.rwMux.RUnlock()
return status
}
func openConnection(uri *url.URL, tlsc *tls.Config, timeout time.Duration) (net.Conn, error) {
switch uri.Scheme {
case "tcp":
return net.DialTimeout("tcp", uri.Host, timeout)
case "ssl", "tls", "tcps":
return tls.DialWithDialer(&net.Dialer{Timeout: timeout}, "tcp", uri.Host, tlsc)
}
return nil, errors.New("unknown protocol")
}