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TA贡献1906条经验 获得超10个赞
UDP是一种无连接协议——主机发送数据包而不先建立连接。
为了让多个内核并行处理 UDP 数据包,您可能会启动一堆 goroutines,每个 goroutines 执行ReadFromUDP循环:
package main
import (
"fmt"
"net"
"runtime"
)
func listen(connection *net.UDPConn, quit chan struct{}) {
buffer := make([]byte, 1024)
n, remoteAddr, err := 0, new(net.UDPAddr), error(nil)
for err == nil {
n, remoteAddr, err = connection.ReadFromUDP(buffer)
// you might copy out the contents of the packet here, to
// `var r myapp.Request`, say, and `go handleRequest(r)` (or
// send it down a channel) to free up the listening
// goroutine. you do *need* to copy then, though,
// because you've only made one buffer per listen().
fmt.Println("from", remoteAddr, "-", buffer[:n])
}
fmt.Println("listener failed - ", err)
quit <- struct{}{}
}
func main() {
addr := net.UDPAddr{
Port: 12345,
IP: net.IP{127, 0, 0, 1},
}
connection, err := net.ListenUDP("udp", &addr)
if err != nil {
panic(err)
}
quit := make(chan struct{})
for i := 0; i < runtime.NumCPU(); i++ {
go listen(connection, quit)
}
<-quit // hang until an error
}
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