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toxic_test.go
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toxic_test.go
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package toxics_test
import (
"bufio"
"bytes"
"encoding/json"
"io"
"net"
"strings"
"testing"
"time"
"github.com/Shopify/toxiproxy/v2"
"github.com/Shopify/toxiproxy/v2/collectors"
"github.com/Shopify/toxiproxy/v2/toxics"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
tomb "gopkg.in/tomb.v1"
)
func init() {
logrus.SetLevel(logrus.FatalLevel)
}
func NewTestProxy(name, upstream string) *toxiproxy.Proxy {
srv := toxiproxy.NewServer(toxiproxy.NewMetricsContainer(prometheus.NewRegistry()))
srv.Metrics.ProxyMetrics = collectors.NewProxyMetricCollectors()
proxy := toxiproxy.NewProxy(srv, name, "localhost:0", upstream)
return proxy
}
func WithEchoServer(t *testing.T, f func(string, chan []byte)) {
ln, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatal("Failed to create TCP server", err)
}
defer ln.Close()
response := make(chan []byte, 1)
tomb := tomb.Tomb{}
go func() {
defer tomb.Done()
src, err := ln.Accept()
if err != nil {
select {
case <-tomb.Dying():
default:
t.Error("Failed to accept client")
return
}
return
}
ln.Close()
scan := bufio.NewScanner(src)
if scan.Scan() {
received := append(scan.Bytes(), '\n')
response <- received
src.Write(received)
}
}()
f(ln.Addr().String(), response)
tomb.Killf("Function body finished")
ln.Close()
tomb.Wait()
close(response)
}
func WithEchoProxy(
t *testing.T,
f func(proxy net.Conn, response chan []byte, proxyServer *toxiproxy.Proxy),
) {
WithEchoServer(t, func(upstream string, response chan []byte) {
proxy := NewTestProxy("test", upstream)
proxy.Start()
conn, err := net.Dial("tcp", proxy.Listen)
if err != nil {
t.Error("Unable to dial TCP server", err)
}
f(conn, response, proxy)
proxy.Stop()
})
}
func ToxicToJson(t *testing.T, name, typeName, stream string, toxic toxics.Toxic) io.Reader {
data := map[string]interface{}{
"name": name,
"type": typeName,
"stream": stream,
"attributes": toxic,
}
request, err := json.Marshal(data)
if err != nil {
t.Errorf("Failed to marshal toxic for api (1): %v", toxic)
}
return bytes.NewReader(request)
}
func AssertEchoResponse(t *testing.T, client, server net.Conn) {
msg := []byte("hello world\n")
_, err := client.Write(msg)
if err != nil {
t.Error("Failed writing to TCP server", err)
}
scan := bufio.NewScanner(server)
if !scan.Scan() {
t.Error("Client unexpectedly closed connection")
}
resp := append(scan.Bytes(), '\n')
if !bytes.Equal(resp, msg) {
t.Error("Server didn't read correct bytes from client:", string(resp))
}
_, err = server.Write(resp)
if err != nil {
t.Error("Failed writing to TCP client", err)
}
scan = bufio.NewScanner(client)
if !scan.Scan() {
t.Error("Server unexpectedly closed connection")
}
resp = append(scan.Bytes(), '\n')
if !bytes.Equal(resp, msg) {
t.Error("Client didn't read correct bytes from server:", string(resp))
}
}
func TestPersistentConnections(t *testing.T) {
ln, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatal("Failed to create TCP server", err)
}
defer ln.Close()
proxy := NewTestProxy("test", ln.Addr().String())
proxy.Start()
defer proxy.Stop()
serverConnRecv := make(chan net.Conn)
go func() {
conn, err := ln.Accept()
if err != nil {
t.Error("Unable to accept TCP connection", err)
}
serverConnRecv <- conn
}()
conn, err := net.Dial("tcp", proxy.Listen)
if err != nil {
t.Error("Unable to dial TCP server", err)
}
serverConn := <-serverConnRecv
proxy.Toxics.AddToxicJson(ToxicToJson(t, "noop_up", "noop", "upstream", &toxics.NoopToxic{}))
proxy.Toxics.AddToxicJson(
ToxicToJson(t, "noop_down", "noop", "downstream", &toxics.NoopToxic{}),
)
AssertEchoResponse(t, conn, serverConn)
proxy.Toxics.ResetToxics()
AssertEchoResponse(t, conn, serverConn)
proxy.Toxics.ResetToxics()
AssertEchoResponse(t, conn, serverConn)
err = conn.Close()
if err != nil {
t.Error("Failed to close TCP connection", err)
}
}
func TestToxicAddRemove(t *testing.T) {
ln, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatal("Failed to create TCP server", err)
}
defer ln.Close()
proxy := NewTestProxy("test", ln.Addr().String())
proxy.Start()
defer proxy.Stop()
serverConnRecv := make(chan net.Conn)
go func() {
conn, err := ln.Accept()
if err != nil {
t.Error("Unable to accept TCP connection", err)
}
serverConnRecv <- conn
}()
conn, err := net.Dial("tcp", proxy.Listen)
if err != nil {
t.Error("Unable to dial TCP server", err)
}
serverConn := <-serverConnRecv
running := make(chan struct{})
go func() {
enabled := false
for {
select {
case <-running:
return
default:
if enabled {
proxy.Toxics.AddToxicJson(
ToxicToJson(t, "noop_up", "noop", "upstream", &toxics.NoopToxic{}),
)
proxy.Toxics.RemoveToxic("noop_down")
} else {
proxy.Toxics.RemoveToxic("noop_up")
proxy.Toxics.AddToxicJson(
ToxicToJson(t, "noop_down", "noop", "downstream", &toxics.NoopToxic{}),
)
}
enabled = !enabled
}
}
}()
for i := 0; i < 100; i++ {
AssertEchoResponse(t, conn, serverConn)
}
close(running)
err = conn.Close()
if err != nil {
t.Error("Failed to close TCP connection", err)
}
}
func TestProxyLatency(t *testing.T) {
ln, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatal("Failed to create TCP server", err)
}
defer ln.Close()
proxy := NewTestProxy("test", ln.Addr().String())
proxy.Start()
defer proxy.Stop()
serverConnRecv := make(chan net.Conn)
go func() {
conn, err := ln.Accept()
if err != nil {
t.Error("Unable to accept TCP connection", err)
}
serverConnRecv <- conn
}()
conn, err := net.Dial("tcp", proxy.Listen)
if err != nil {
t.Error("Unable to dial TCP server", err)
}
serverConn := <-serverConnRecv
start := time.Now()
for i := 0; i < 100; i++ {
AssertEchoResponse(t, conn, serverConn)
}
latency := time.Since(start) / 200
if latency > 300*time.Microsecond {
t.Errorf("Average proxy latency > 300µs (%v)", latency)
} else {
t.Logf("Average proxy latency: %v", latency)
}
err = conn.Close()
if err != nil {
t.Error("Failed to close TCP connection", err)
}
}
func BenchmarkProxyBandwidth(b *testing.B) {
ln, err := net.Listen("tcp", "localhost:0")
if err != nil {
b.Fatal("Failed to create TCP server", err)
}
defer ln.Close()
proxy := NewTestProxy("test", ln.Addr().String())
proxy.Start()
defer proxy.Stop()
buf := []byte(strings.Repeat("hello world ", 1000))
go func() {
conn, err := ln.Accept()
if err != nil {
b.Error("Unable to accept TCP connection", err)
}
buf2 := make([]byte, len(buf))
for err == nil {
_, err = conn.Read(buf2)
}
}()
conn, err := net.Dial("tcp", proxy.Listen)
if err != nil {
b.Error("Unable to dial TCP server", err)
}
b.SetBytes(int64(len(buf)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
n, err := conn.Write(buf)
if err != nil || n != len(buf) {
b.Errorf("%v, %d == %d", err, n, len(buf))
break
}
}
err = conn.Close()
if err != nil {
b.Error("Failed to close TCP connection", err)
}
}