/*
   Copyright 2014 CoreOS, Inc.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package transport

import (
	"net"
	"testing"
	"time"
)

// TestNewTimeoutListener tests that NewTimeoutListener returns a
// rwTimeoutListener struct with timeouts set.
func TestNewTimeoutListener(t *testing.T) {
	l, err := NewTimeoutListener("127.0.0.1:0", "http", TLSInfo{}, time.Hour, time.Hour)
	if err != nil {
		t.Fatalf("unexpected NewTimeoutListener error: %v", err)
	}
	defer l.Close()
	tln := l.(*rwTimeoutListener)
	if tln.rdtimeoutd != time.Hour {
		t.Errorf("read timeout = %s, want %s", tln.rdtimeoutd, time.Hour)
	}
	if tln.wtimeoutd != time.Hour {
		t.Errorf("write timeout = %s, want %s", tln.wtimeoutd, time.Hour)
	}
}

func TestWriteReadTimeoutListener(t *testing.T) {
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("unexpected listen error: %v", err)
	}
	wln := rwTimeoutListener{
		Listener:   ln,
		wtimeoutd:  10 * time.Millisecond,
		rdtimeoutd: 10 * time.Millisecond,
	}
	stop := make(chan struct{})

	blocker := func() {
		conn, err := net.Dial("tcp", ln.Addr().String())
		if err != nil {
			t.Fatalf("unexpected dail error: %v", err)
		}
		defer conn.Close()
		// block the receiver until the writer timeout
		<-stop
	}
	go blocker()

	conn, err := wln.Accept()
	if err != nil {
		t.Fatalf("unexpected accept error: %v", err)
	}
	defer conn.Close()

	// fill the socket buffer
	data := make([]byte, 5*1024*1024)
	timer := time.AfterFunc(wln.wtimeoutd*5, func() {
		t.Fatal("wait timeout")
	})
	defer timer.Stop()

	_, err = conn.Write(data)
	if operr, ok := err.(*net.OpError); !ok || operr.Op != "write" || !operr.Timeout() {
		t.Errorf("err = %v, want write i/o timeout error", err)
	}
	stop <- struct{}{}

	timer.Reset(wln.rdtimeoutd * 5)
	go blocker()

	conn, err = wln.Accept()
	if err != nil {
		t.Fatalf("unexpected accept error: %v", err)
	}
	buf := make([]byte, 10)
	_, err = conn.Read(buf)
	if operr, ok := err.(*net.OpError); !ok || operr.Op != "read" || !operr.Timeout() {
		t.Errorf("err = %v, want write i/o timeout error", err)
	}
	stop <- struct{}{}
}