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// Copyright 2014 Quoc-Viet Nguyen. All rights reserved.
// This software may be modified and distributed under the terms
// of the BSD license. See the LICENSE file for details.
package modbus
import (
"bytes"
"io"
"net"
"testing"
"time"
)
func TestTCPEncoding(t *testing.T) {
packager := tcpPackager{}
pdu := ProtocolDataUnit{}
pdu.FunctionCode = 3
pdu.Data = []byte{0, 4, 0, 3}
adu, err := packager.Encode(&pdu)
if err != nil {
t.Fatal(err)
}
expected := []byte{0, 1, 0, 0, 0, 6, 0, 3, 0, 4, 0, 3}
if !bytes.Equal(expected, adu) {
t.Fatalf("Expected %v, actual %v", expected, adu)
}
}
func TestTCPDecoding(t *testing.T) {
packager := tcpPackager{}
packager.transactionId = 1
packager.SlaveId = 17
adu := []byte{0, 1, 0, 0, 0, 6, 17, 3, 0, 120, 0, 3}
pdu, err := packager.Decode(adu)
if err != nil {
t.Fatal(err)
}
if 3 != pdu.FunctionCode {
t.Fatalf("Function code: expected %v, actual %v", 3, pdu.FunctionCode)
}
expected := []byte{0, 120, 0, 3}
if !bytes.Equal(expected, pdu.Data) {
t.Fatalf("Data: expected %v, actual %v", expected, adu)
}
}
func TestTCPTransporter(t *testing.T) {
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
defer ln.Close()
go func() {
conn, err := ln.Accept()
if err != nil {
t.Error(err)
return
}
defer conn.Close()
_, err = io.Copy(conn, conn)
if err != nil {
t.Error(err)
return
}
}()
client := &tcpTransporter{
Address: ln.Addr().String(),
Timeout: 1 * time.Second,
IdleTimeout: 100 * time.Millisecond,
}
req := []byte{0, 1, 0, 2, 0, 2, 1, 2}
rsp, err := client.Send(req)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(req, rsp) {
t.Fatalf("unexpected response: %x", rsp)
}
time.Sleep(150 * time.Millisecond)
if client.conn != nil {
t.Fatalf("connection is not closed: %+v", client.conn)
}
}
func BenchmarkTCPEncoder(b *testing.B) {
encoder := tcpPackager{
SlaveId: 10,
}
pdu := ProtocolDataUnit{
FunctionCode: 1,
Data: []byte{2, 3, 4, 5, 6, 7, 8, 9},
}
for i := 0; i < b.N; i++ {
_, err := encoder.Encode(&pdu)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkTCPDecoder(b *testing.B) {
decoder := tcpPackager{
SlaveId: 10,
}
adu := []byte{0, 1, 0, 0, 0, 6, 17, 3, 0, 120, 0, 3}
for i := 0; i < b.N; i++ {
_, err := decoder.Decode(adu)
if err != nil {
b.Fatal(err)
}
}
}
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