/
streamclient.go
149 lines (136 loc) · 2.77 KB
/
streamclient.go
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package streamlog
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"net"
"sync/atomic"
"time"
"github.com/Sirupsen/logrus"
)
var errNoConnect = errors.New("no connect")
var errClosed = errors.New("conn is closed")
var errCreate = errors.New("conn is not tcp conn")
//Client stream client
type Client struct {
writer *bufio.Writer
conn *net.TCPConn
server string
closeFlag int32
}
//NewClient 新建客户端
func NewClient(server string) (c *Client, err error) {
conn, err := net.Dial("tcp", server)
if err != nil {
logrus.Error("log stream server connect error.", err.Error())
c = &Client{
server: server,
}
atomic.StoreInt32(&c.closeFlag, 1)
}
if tcpConn, ok := conn.(*net.TCPConn); ok {
c = &Client{
conn: tcpConn,
writer: bufio.NewWriter(conn),
server: server,
}
c.conn.CloseRead()
c.conn.SetKeepAlive(true)
}
if c == nil {
return nil, errCreate
}
return c, nil
}
//Dial 连接
func (c *Client) Dial() error {
if c.IsClosed() {
conn, err := net.Dial("tcp", c.server)
if err != nil {
return err
}
if tcpConn, ok := conn.(*net.TCPConn); ok {
c.conn = tcpConn
c.conn.SetWriteBuffer(1024 * 1024 * 12)
} else {
return errCreate
}
c.writer = bufio.NewWriter(conn)
atomic.StoreInt32(&c.closeFlag, 0)
}
return nil
}
//ChangeAddress 更换服务地址
func (c *Client) ChangeAddress(server string) error {
c.server = server
return c.ReConnect()
}
//ReConnect 重连
func (c *Client) ReConnect() error {
if !c.IsClosed() {
c.Close()
}
return c.Dial()
}
//Close close
func (c *Client) Close() {
if c.conn != nil {
c.conn.Close()
c.conn = nil
}
c.writer = nil
atomic.StoreInt32(&c.closeFlag, 1)
}
//IsClosed close
func (c *Client) IsClosed() bool {
return atomic.LoadInt32(&c.closeFlag) == 1
}
//write if get a error. will close the conn.
func (c *Client) Write(message string) error {
if message == "" {
return nil
}
if c.writer == nil {
return errNoConnect
}
msg, err := c.encode(message)
if err != nil {
return err
}
err = c.write(string(msg))
if err != nil {
c.Close()
//TODO reconect
}
return err
}
func (c *Client) write(message string) error {
if c.conn == nil {
return errClosed
}
c.conn.SetWriteDeadline(time.Now().Add(time.Second * 1))
if c.writer != nil {
_, err := c.writer.WriteString(message)
c.writer.Flush()
return err
}
return errClosed
}
//Encode 编码
func (c *Client) encode(message string) ([]byte, error) {
// 读取消息的长度
var length = int32(len(message))
var pkg = new(bytes.Buffer)
// 写入消息头
err := binary.Write(pkg, binary.LittleEndian, length)
if err != nil {
return nil, err
}
// 写入消息实体
err = binary.Write(pkg, binary.LittleEndian, []byte(message))
if err != nil {
return nil, err
}
return pkg.Bytes(), nil
}