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echo_server.go
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echo_server.go
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package mock
import (
"fmt"
"io"
"net"
"os"
"syscall"
frpNet "github.com/HaidyCao/frp_0300/utils/net"
)
type EchoServer struct {
l net.Listener
port int
repeatedNum int
specifyStr string
}
func NewEchoServer(port int, repeatedNum int, specifyStr string) *EchoServer {
if repeatedNum <= 0 {
repeatedNum = 1
}
return &EchoServer{
port: port,
repeatedNum: repeatedNum,
specifyStr: specifyStr,
}
}
func (es *EchoServer) Start() error {
l, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", es.port))
if err != nil {
fmt.Printf("echo server listen error: %v\n", err)
return err
}
es.l = l
go func() {
for {
c, err := l.Accept()
if err != nil {
return
}
go echoWorker(c, es.repeatedNum, es.specifyStr)
}
}()
return nil
}
func (es *EchoServer) Stop() {
es.l.Close()
}
func StartUdpEchoServer(port int) {
l, err := frpNet.ListenUDP("127.0.0.1", port)
if err != nil {
fmt.Printf("udp echo server listen error: %v\n", err)
return
}
for {
c, err := l.Accept()
if err != nil {
fmt.Printf("udp echo server accept error: %v\n", err)
return
}
go echoWorker(c, 1, "")
}
}
func StartUnixDomainServer(unixPath string) {
os.Remove(unixPath)
syscall.Umask(0)
l, err := net.Listen("unix", unixPath)
if err != nil {
fmt.Printf("unix domain server listen error: %v\n", err)
return
}
for {
c, err := l.Accept()
if err != nil {
fmt.Printf("unix domain server accept error: %v\n", err)
return
}
go echoWorker(c, 1, "")
}
}
func echoWorker(c net.Conn, repeatedNum int, specifyStr string) {
buf := make([]byte, 2048)
for {
n, err := c.Read(buf)
if err != nil {
if err == io.EOF {
c.Close()
break
} else {
fmt.Printf("echo server read error: %v\n", err)
return
}
}
if specifyStr != "" {
c.Write([]byte(specifyStr))
} else {
var w []byte
for i := 0; i < repeatedNum; i++ {
w = append(w, buf[:n]...)
}
c.Write(w)
}
}
}