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speedbump_test.go
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speedbump_test.go
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package lib
import (
"fmt"
"io"
"net"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
var defaultLatencyCfg = &LatencyCfg{
Base: time.Millisecond * 5,
SineAmplitude: time.Duration(0),
SinePeriod: time.Minute,
}
func startEchoSrv(port int) error {
srv, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
if err != nil {
return err
}
defer srv.Close()
for {
conn, err := srv.Accept()
if err != nil {
continue
}
go func(c net.Conn) {
defer c.Close()
io.Copy(c, c)
}(conn)
}
}
func TestNewSpeedbump(t *testing.T) {
cfg := SpeedbumpCfg{
8000,
"localhost:1234",
0xffff,
100,
defaultLatencyCfg,
"WARN",
}
s, err := NewSpeedbump(&cfg)
assert.Nil(t, err)
assert.Equal(t, 0xffff, s.bufferSize)
}
func TestNewSpeedbumpErrorResolvingLocal(t *testing.T) {
cfg := SpeedbumpCfg{
-1,
"localhost:1234",
0xffff,
100,
defaultLatencyCfg,
"WARN",
}
s, err := NewSpeedbump(&cfg)
assert.Nil(t, s)
assert.True(t, strings.HasPrefix(err.Error(), "Error resolving local"))
}
func TestNewSpeedbumpErrorResolvingDest(t *testing.T) {
cfg := SpeedbumpCfg{
8000,
"nope:1234",
0xffff,
100,
defaultLatencyCfg,
"WARN",
}
s, err := NewSpeedbump(&cfg)
assert.Nil(t, s)
assert.True(t, strings.HasPrefix(err.Error(), "Error resolving destination"))
}
func TestNewSpeedbumpDefaultQueueSize(t *testing.T) {
cfg := SpeedbumpCfg{
Port: 8000,
DestAddr: "localhost:1234",
BufferSize: 0xffff,
// QueueSize is ommitted
Latency: defaultLatencyCfg,
LogLevel: "WARN",
}
s, err := NewSpeedbump(&cfg)
assert.Nil(t, err)
assert.Equal(t, 1024, s.queueSize)
}
func TestStartListenError(t *testing.T) {
cfg := SpeedbumpCfg{
1, // a privileged port
"localhost:1234",
0xffff,
100,
defaultLatencyCfg,
"WARN",
}
s, _ := NewSpeedbump(&cfg)
err := s.Start()
assert.True(t, strings.HasPrefix(err.Error(), "Error starting TCP listener"))
}
func isDurationCloseTo(expected time.Duration, obtianed time.Duration, percentage int) bool {
absoluteError := int(expected) - int(obtianed)
if absoluteError < 0 {
absoluteError *= -1
}
errorPercentage := float64(absoluteError) / float64(expected) * 100.0
return errorPercentage < float64(percentage)
}
func TestSpeedbumpWithEchoServer(t *testing.T) {
port := 9006
testSrvAddr := fmt.Sprintf("localhost:%d", port)
go startEchoSrv(port)
cfg := SpeedbumpCfg{
8000,
testSrvAddr,
0xffff,
100,
&LatencyCfg{
Base: time.Millisecond * 100,
SineAmplitude: time.Millisecond * 100,
SinePeriod: time.Millisecond * 400,
},
"WARN",
}
s, err := NewSpeedbump(&cfg)
go s.Start()
assert.Nil(t, err)
tcpAddr, _ := net.ResolveTCPAddr("tcp", "localhost:8000")
var conn *net.TCPConn
// Wait for the speedbump instance to start listening
// since it is started in a separate goroutine, we don't know
// if it has already started listening by this point
for {
conn, err = net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
time.Sleep(10 * time.Millisecond)
} else {
break
}
}
firstOpStart := time.Now()
conn.Write([]byte("test-string"))
res := make([]byte, 1024)
bytes, _ := conn.Read(res)
firstOpElapsed := time.Since(firstOpStart)
trimmedRes := res[:bytes]
assert.Equal(t, []byte("test-string"), trimmedRes)
assert.True(t, isDurationCloseTo(time.Millisecond*100, firstOpElapsed, 20))
// after ~100ms since test start the added delay will be at 200ms (100ms base + 100ms sine wave max)
secondOpStart := time.Now()
conn.Write([]byte("another-test"))
res = make([]byte, 1024)
bytes, _ = conn.Read(res)
secondOpElapsed := time.Since(secondOpStart)
trimmedRes = res[:bytes]
s.Stop()
assert.Equal(t, []byte("another-test"), trimmedRes)
assert.True(t, isDurationCloseTo(time.Millisecond*200, secondOpElapsed, 20))
}