golib/network/common.go

package network

import (
	"fmt"
	"net"
	"time"
)

// Body 通过 defaultPool 分配 byte 数组
func Body() (p []byte) {
	p = defaultPool.Get().([]byte)
	defaultPool.Put(p)
	return
}

// Dial 拨号. network 可选 NetTCP 或 NetUDP 表示使用 TCP 或 UDP 协议, address 为服务器地址
// Dial 实现 net.Conn 接口
func Dial(network, address string) (net.Conn, error) {
	return DialTimout(network, address, DefaultDialTimout)
}

// DialTimout 拨号并指定超时时间
func DialTimout(network, address string, timout time.Duration) (net.Conn, error) {
	conn, err := net.DialTimeout(network, address, timout)
	if err != nil {
		return nil, err
	}
	switch network {
	case NetTCP:
		return createTCPClient(conn), nil
	case NetUDP:
		panic("not implemented")
	default:
		panic(fmt.Sprintf("unsupported protocol: %s", network))
	}
}

// NewModbusClient 每秒使用 data 创建数据并发送至服务器
func NewModbusClient(conn net.Conn, data ModbusCreator) ModbusClient {
	ms := new(modbusClient)
	ms.connected = true
	ms.b = make([]byte, 0)
	ms.p = make(chan []byte, 1)
	ms.data = data
	ms.conn = conn
	go ms.async()
	return ms
}