micro/tunnel/tunnel_test.go

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package tunnel
import (
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"sync"
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"testing"
"time"
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"github.com/micro/go-micro/transport"
)
// testAccept will accept connections on the transport, create a new link and tunnel on top
func testAccept(t *testing.T, tun Tunnel, wait chan bool, wg *sync.WaitGroup) {
defer wg.Done()
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// listen on some virtual address
tl, err := tun.Listen("test-tunnel")
if err != nil {
t.Fatal(err)
}
// receiver ready; notify sender
wait <- true
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// accept a connection
c, err := tl.Accept()
if err != nil {
t.Fatal(err)
}
// get a message
for {
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// accept the message
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m := new(transport.Message)
if err := c.Recv(m); err != nil {
t.Fatal(err)
}
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if v := m.Header["test"]; v != "send" {
t.Fatalf("Accept side expected test:send header. Received: %s", v)
}
// now respond
m.Header["test"] = "accept"
if err := c.Send(m); err != nil {
t.Fatal(err)
}
wait <- true
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return
}
}
// testSend will create a new link to an address and then a tunnel on top
func testSend(t *testing.T, tun Tunnel, wait chan bool, wg *sync.WaitGroup) {
defer wg.Done()
// wait for the listener to get ready
<-wait
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// dial a new session
c, err := tun.Dial("test-tunnel")
if err != nil {
t.Fatal(err)
}
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defer c.Close()
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m := transport.Message{
Header: map[string]string{
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"test": "send",
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},
}
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// send the message
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if err := c.Send(&m); err != nil {
t.Fatal(err)
}
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// now wait for the response
mr := new(transport.Message)
if err := c.Recv(mr); err != nil {
t.Fatal(err)
}
<-wait
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if v := mr.Header["test"]; v != "accept" {
t.Fatalf("Message not received from accepted side. Received: %s", v)
}
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}
func TestTunnel(t *testing.T) {
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// create a new tunnel client
tunA := NewTunnel(
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Address("127.0.0.1:9096"),
Nodes("127.0.0.1:9097"),
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)
// create a new tunnel server
tunB := NewTunnel(
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Address("127.0.0.1:9097"),
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)
// start tunB
err := tunB.Connect()
if err != nil {
t.Fatal(err)
}
defer tunB.Close()
// start tunA
err = tunA.Connect()
if err != nil {
t.Fatal(err)
}
defer tunA.Close()
wait := make(chan bool)
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var wg sync.WaitGroup
wg.Add(1)
// start the listener
go testAccept(t, tunB, wait, &wg)
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wg.Add(1)
// start the client
go testSend(t, tunA, wait, &wg)
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// wait until done
wg.Wait()
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}
func TestLoopbackTunnel(t *testing.T) {
// create a new tunnel
tun := NewTunnel(
Address("127.0.0.1:9096"),
Nodes("127.0.0.1:9096"),
)
// start tunnel
err := tun.Connect()
if err != nil {
t.Fatal(err)
}
defer tun.Close()
time.Sleep(500 * time.Millisecond)
wait := make(chan bool)
var wg sync.WaitGroup
wg.Add(1)
// start the listener
go testAccept(t, tun, wait, &wg)
wg.Add(1)
// start the client
go testSend(t, tun, wait, &wg)
// wait until done
wg.Wait()
}
func testBrokenTunAccept(t *testing.T, tun Tunnel, wait chan bool, wg *sync.WaitGroup) {
defer wg.Done()
// listen on some virtual address
tl, err := tun.Listen("test-tunnel")
if err != nil {
t.Fatal(err)
}
// receiver ready; notify sender
wait <- true
// accept a connection
c, err := tl.Accept()
if err != nil {
t.Fatal(err)
}
// accept the message and close the tunnel
// we do this to simulate loss of network connection
m := new(transport.Message)
if err := c.Recv(m); err != nil {
t.Fatal(err)
}
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// close all the links
for _, link := range tun.Links() {
link.Close()
}
// receiver ready; notify sender
wait <- true
// accept the message
m = new(transport.Message)
if err := c.Recv(m); err != nil {
t.Fatal(err)
}
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// notify the sender we have received
wait <- true
}
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func testBrokenTunSend(t *testing.T, tun Tunnel, wait chan bool, wg *sync.WaitGroup, reconnect time.Duration) {
defer wg.Done()
// wait for the listener to get ready
<-wait
// dial a new session
c, err := tun.Dial("test-tunnel")
if err != nil {
t.Fatal(err)
}
defer c.Close()
m := transport.Message{
Header: map[string]string{
"test": "send",
},
}
// send the message
if err := c.Send(&m); err != nil {
t.Fatal(err)
}
// wait for the listener to get ready
<-wait
// give it time to reconnect
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time.Sleep(10 * reconnect)
// send the message
if err := c.Send(&m); err != nil {
t.Fatal(err)
}
// wait for the listener to receive the message
// c.Send merely enqueues the message to the link send queue and returns
// in order to verify it was received we wait for the listener to tell us
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<-wait
}
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func TestTunnelRTTRate(t *testing.T) {
// create a new tunnel client
tunA := NewTunnel(
Address("127.0.0.1:9096"),
Nodes("127.0.0.1:9097"),
)
// create a new tunnel server
tunB := NewTunnel(
Address("127.0.0.1:9097"),
)
// start tunB
err := tunB.Connect()
if err != nil {
t.Fatal(err)
}
defer tunB.Close()
// start tunA
err = tunA.Connect()
if err != nil {
t.Fatal(err)
}
defer tunA.Close()
wait := make(chan bool)
var wg sync.WaitGroup
wg.Add(1)
// start the listener
go testAccept(t, tunB, wait, &wg)
wg.Add(1)
// start the client
go testSend(t, tunA, wait, &wg)
// wait until done
wg.Wait()
for _, link := range tunA.Links() {
t.Logf("Link %s length %v rate %v", link.Id(), link.Length(), link.Rate())
}
for _, link := range tunB.Links() {
t.Logf("Link %s length %v rate %v", link.Id(), link.Length(), link.Rate())
}
}