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network.go
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network.go
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package client
import (
"errors"
"io"
"net"
"sync"
"time"
)
var ErrConnectionClosed = errors.New("connection closed")
type TCPClient struct {
lock sync.RWMutex
addr string
conn net.Conn
timeout int
connected bool
}
func NewTCPClient(addr string, timeout int) *TCPClient {
return &TCPClient{
addr: addr,
timeout: timeout,
}
}
func (c *TCPClient) Connect() error {
conn, err := net.DialTimeout("tcp", c.addr, time.Duration(c.timeout)*time.Second)
if err != nil {
return err
}
networkLogger.Infof("connected to %s", conn.RemoteAddr())
c.lock.Lock()
defer c.lock.Unlock()
c.conn = conn
c.connected = true
return nil
}
func (c *TCPClient) Write(b []byte) error {
if conn := c.getConn(); conn != nil {
n, err := conn.Write(b)
if err != nil {
return ErrConnectionClosed
}
networkLogger.Tracef("tcp write %d bytes", n)
return nil
}
return ErrConnectionClosed
}
func (c *TCPClient) ReadBytes(len int) ([]byte, error) {
if conn := c.getConn(); conn != nil {
buffer := make([]byte, len)
_, err := io.ReadFull(conn, buffer)
if err != nil {
c.onDisconnetced()
return nil, ErrConnectionClosed
}
return buffer, nil
}
return nil, ErrConnectionClosed
}
func (c *TCPClient) onDisconnetced() {
c.Close()
}
func (c *TCPClient) Close() {
c.lock.Lock()
defer c.lock.Unlock()
if c.conn != nil {
_ = c.conn.Close()
networkLogger.Error("tcp closed")
c.conn = nil
c.connected = false
}
}
func (c *TCPClient) getConn() net.Conn {
c.lock.RLock()
defer c.lock.RUnlock()
return c.conn
}
func (c *TCPClient) IsClosed() bool {
return !c.connected
}