/
netserver.go
135 lines (126 loc) · 2.79 KB
/
netserver.go
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// This file is part of graze/golang-service
//
// Copyright (c) 2016 Nature Delivered Ltd. <https://www.graze.com>
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.
//
// license: https://github.com/graze/golang-service/blob/master/LICENSE
// link: https://github.com/graze/golang-service
package nettest
import (
"bufio"
"io"
"io/ioutil"
"net"
"os"
"sync"
"testing"
"time"
)
// CreateServer creates a network server that will output all messages to the done channel for use with testing
//
// It can create `udp`, `unixgram`, and `tcp` networks
//
// Example:
// done := make(chan string)
// addr, sock, srvWg := CreateServer(t, tc.net, tc.la, done)
// defer srvWg.Wait()
// defer os.Remove(addr.String())
// defer sock.Close()
//
// s, err := net.Dial(tc.net, addr.String())
// defer s.Close()
// fmt.Fprintf(s, "test message\n")
// if "test message\n" != <-done {
// t.Error("message not recieved")
// }
func CreateServer(t *testing.T, n, la string, done chan<- string) (addr net.Addr, sock io.Closer, wg *sync.WaitGroup) {
if n == "udp" || n == "tcp" {
la = "127.0.0.1:0"
} else {
// unix and unixgram: choose an address if none given
if la == "" {
// use ioutil.TempFile to get a name that is unique
f, err := ioutil.TempFile("", "servertest")
if err != nil {
t.Fatalf("TempFile: %v", err)
}
f.Close()
la = f.Name()
}
os.Remove(la)
}
wg = new(sync.WaitGroup)
if n == "udp" || n == "unixgram" {
l, err := net.ListenPacket(n, la)
if err != nil {
t.Fatalf("CreateServer failed: %v", err)
}
addr = l.LocalAddr()
sock = l
wg.Add(1)
go func() {
defer wg.Done()
readPackets(l, done)
}()
} else {
l, err := net.Listen(n, la)
if err != nil {
t.Fatalf("CreateServer failed: %v", err)
}
addr = l.Addr()
sock = l
wg.Add(1)
go func() {
defer wg.Done()
readStream(l, done, wg)
}()
}
return
}
func readStream(l net.Listener, done chan<- string, wg *sync.WaitGroup) {
for {
var c net.Conn
var err error
if c, err = l.Accept(); err != nil {
return
}
wg.Add(1)
go func(c net.Conn) {
defer wg.Done()
c.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
b := bufio.NewReader(c)
for ct := 1; ct&7 != 0; ct++ {
s, err := b.ReadString('\n')
if err != nil {
break
}
done <- s
}
c.Close()
}(c)
}
}
func readPackets(c net.PacketConn, done chan<- string) {
var buf [4096]byte
ct := 0
for {
var n int
var err error
c.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
n, _, err = c.ReadFrom(buf[:])
rcvd := string(buf[:n])
if err != nil {
if oe, ok := err.(*net.OpError); ok {
if ct < 3 && oe.Temporary() {
ct++
continue
}
}
break
}
done <- rcvd
}
c.Close()
}