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echo.go
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echo.go
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// Copyright 2018 Istio Authors
//
// 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 util
import (
"bytes"
"context"
"crypto/tls"
"fmt"
"io"
"io/ioutil"
"log"
"math/rand"
"net"
"net/http"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
echopb "istio.io/istio/pkg/test/application/echo/proto"
)
var upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
// allow all connections by default
return true
},
} //defaults
type pilotTestHandler struct {
port int
version string
}
// Imagine a pie of different flavors.
// The flavors are the HTTP response codes.
// The chance of a particular flavor is ( slices / sum of slices ).
type codeAndSlices struct {
httpResponseCode int
slices int
}
func (h *pilotTestHandler) addResponsePayload(r *http.Request, body *bytes.Buffer) { // nolint:interfacer
body.WriteString("ServiceVersion=" + h.version + "\n")
body.WriteString("ServicePort=" + strconv.Itoa(h.port) + "\n")
body.WriteString("Method=" + r.Method + "\n")
body.WriteString("URL=" + r.URL.String() + "\n")
body.WriteString("Proto=" + r.Proto + "\n")
body.WriteString("RemoteAddr=" + r.RemoteAddr + "\n")
body.WriteString("Host=" + r.Host + "\n")
for name, headers := range r.Header {
for _, h := range headers {
body.WriteString(fmt.Sprintf("%v=%v\n", name, h))
}
}
if hostname, err := os.Hostname(); err == nil {
body.WriteString(fmt.Sprintf("Hostname=%v\n", hostname))
}
}
func (h *pilotTestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("testwebsocket") != "" {
h.WebSocketEcho(w, r)
return
}
body := bytes.Buffer{}
if err := r.ParseForm(); err != nil {
body.WriteString("ParseForm() error: " + err.Error() + "\n")
}
if len(r.FormValue("url")) > 0 {
echoClientHandler(w, r)
return
}
// If the request has form ?codes=code[:chance][,code[:chance]]* return those codes, rather than 200
// For example, ?codes=500:1,200:1 returns 500 1/2 times and 200 1/2 times
// For example, ?codes=500:90,200:10 returns 500 90% of times and 200 10% of times
if err := setResponseFromCodes(r, w); err != nil {
body.WriteString("codes error: " + err.Error() + "\n")
}
h.addResponsePayload(r, &body)
w.Header().Set("Content-Type", "application/text")
if _, err := w.Write(body.Bytes()); err != nil {
log.Println(err.Error())
}
}
func (h *pilotTestHandler) Echo(ctx context.Context, req *echopb.EchoRequest) (*echopb.EchoResponse, error) {
body := bytes.Buffer{}
md, ok := metadata.FromIncomingContext(ctx)
if ok {
for key, vals := range md {
body.WriteString(key + "=" + strings.Join(vals, " ") + "\n")
}
}
body.WriteString("ServiceVersion=" + h.version + "\n")
body.WriteString("ServicePort=" + strconv.Itoa(h.port) + "\n")
body.WriteString("Echo=" + req.GetMessage())
return &echopb.EchoResponse{Message: body.String()}, nil
}
func (h *pilotTestHandler) ForwardEcho(ctx context.Context, in *echopb.ForwardEchoRequest) (*echopb.ForwardEchoResponse, error) {
return nil, fmt.Errorf("unsupported operation")
}
func (h *pilotTestHandler) WebSocketEcho(w http.ResponseWriter, r *http.Request) {
body := bytes.Buffer{}
h.addResponsePayload(r, &body) // create resp payload apriori
// adapted from https://github.com/gorilla/websocket/blob/master/examples/echo/server.go
// First send upgrade headers
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println("websocket-echo upgrade failed:", err)
return
}
// nolint: errcheck
defer c.Close()
// ping
mt, message, err := c.ReadMessage()
if err != nil {
log.Println("websocket-echo read failed:", err)
return
}
// pong
body.Write(message)
err = c.WriteMessage(mt, body.Bytes())
if err != nil {
log.Println("websocket-echo write failed:", err)
return
}
}
// RunHTTP runs the http echo service.
func RunHTTP(port int, version string) {
fmt.Printf("Listening HTTP1.1 on %v\n", port)
h := &pilotTestHandler{port: port, version: version}
if err := http.ListenAndServe(fmt.Sprintf(":%d", port), h); err != nil {
log.Println(err.Error())
}
}
// RunGRPC runs the GRPC service, with optional TLS
func RunGRPC(port int, version, crt, key string) {
fmt.Printf("Listening GRPC on %v\n", port)
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
h := pilotTestHandler{port: port, version: version}
var grpcServer *grpc.Server
if crt != "" && key != "" {
// Create the TLS credentials
creds, errCreds := credentials.NewServerTLSFromFile(crt, key)
if errCreds != nil {
log.Fatalf("could not load TLS keys: %s", errCreds)
}
grpcServer = grpc.NewServer(grpc.Creds(creds))
} else {
grpcServer = grpc.NewServer()
}
echopb.RegisterEchoTestServiceServer(grpcServer, &h)
if err = grpcServer.Serve(lis); err != nil {
log.Println(err.Error())
}
}
func setResponseFromCodes(request *http.Request, response http.ResponseWriter) error {
responseCodes := request.FormValue("codes")
codes, err := validateCodes(responseCodes)
if err != nil {
return err
}
// Choose a random "slice" from a pie
var totalSlices = 0
for _, flavor := range codes {
totalSlices += flavor.slices
}
slice := rand.Intn(totalSlices)
// What flavor is that slice?
responseCode := codes[len(codes)-1].httpResponseCode // Assume the last slice
position := 0
for n, flavor := range codes {
if position > slice {
responseCode = codes[n-1].httpResponseCode // No, use an earlier slice
break
}
position += flavor.slices
}
response.WriteHeader(responseCode)
return nil
}
// codes must be comma-separated HTTP response code, colon, positive integer
func validateCodes(codestrings string) ([]codeAndSlices, error) {
if codestrings == "" {
// Consider no codes to be "200:1" -- return HTTP 200 100% of the time.
codestrings = strconv.Itoa(http.StatusOK) + ":1"
}
aCodestrings := strings.Split(codestrings, ",")
codes := make([]codeAndSlices, len(aCodestrings))
for i, codestring := range aCodestrings {
codeAndSlice, err := validateCodeAndSlices(codestring)
if err != nil {
return []codeAndSlices{{http.StatusBadRequest, 1}}, err
}
codes[i] = codeAndSlice
}
return codes, nil
}
// code must be HTTP response code
func validateCodeAndSlices(codecount string) (codeAndSlices, error) {
flavor := strings.Split(codecount, ":")
// Demand code or code:number
if len(flavor) == 0 || len(flavor) > 2 {
return codeAndSlices{http.StatusBadRequest, 9999}, fmt.Errorf("invalid %q (want code or code:count)", codecount)
}
n, err := strconv.Atoi(flavor[0])
if err != nil {
return codeAndSlices{http.StatusBadRequest, 9999}, err
}
if n < http.StatusOK || n >= 600 {
return codeAndSlices{http.StatusBadRequest, 9999}, fmt.Errorf("invalid HTTP response code %v", n)
}
count := 1
if len(flavor) > 1 {
count, err = strconv.Atoi(flavor[1])
if err != nil {
return codeAndSlices{http.StatusBadRequest, 9999}, err
}
if count < 0 {
return codeAndSlices{http.StatusBadRequest, 9999}, fmt.Errorf("invalid count %v", count)
}
}
return codeAndSlices{n, count}, nil
}
// Client side
type job func(int, io.Writer) error
const (
hostKey = "Host"
)
// EchoClient controls the client
type EchoClient struct {
count int
timeout time.Duration
qps int
url string
headerKey string
headerVal string
msg string
caFile string
grpcConn *grpc.ClientConn
httpClient *http.Client
wsClient *websocket.Dialer
grpcClient echopb.EchoTestServiceClient
}
func (ec *EchoClient) makeHTTPRequest(i int, w io.Writer) error {
req, err := http.NewRequest("GET", ec.url, nil)
if err != nil {
return err
}
//log.Printf("[%d] Url=%s\n", i, ec.url)
if ec.headerKey == hostKey {
req.Host = ec.headerVal
//log.Printf("[%d] Host=%s\n", i, ec.headerVal)
} else if ec.headerKey != "" {
req.Header.Add(ec.headerKey, ec.headerVal)
//log.Printf("[%d] Header=%s:%s\n", i, ec.headerKey, ec.headerVal)
}
resp, err := ec.httpClient.Do(req)
if err != nil {
return err
}
if resp.StatusCode != 200 && w != nil {
fmt.Fprintf(w, "[%d] StatusCode=%d\n", i, resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
_ = resp.Body.Close()
if err != nil {
return err
}
for _, line := range strings.Split(string(data), "\n") {
if line != "" {
if w != nil {
fmt.Fprintf(w, "[%d body] %s\n", i, line)
}
}
}
return nil
}
func (ec *EchoClient) makeWebSocketRequest(i int, w io.Writer) error {
req := make(http.Header)
//log.Printf("[%d] Url=%s\n", i, ec.url)
if ec.headerKey == hostKey {
req.Add("Host", ec.headerVal)
//log.Printf("[%d] Host=%s\n", i, ec.headerVal)
} else if ec.headerKey != "" {
req.Add(ec.headerKey, ec.headerVal)
//log.Printf("[%d] Header=%s:%s\n", i, ec.headerKey, ec.headerVal)
}
//if ec.msg != "" {
// log.Printf("[%d] Body=%s\n", i, ec.msg)
//}
conn, _, err := ec.wsClient.Dial(ec.url, req)
if err != nil {
// timeout or bad handshake
return err
}
// nolint: errcheck
defer conn.Close()
err = conn.WriteMessage(websocket.TextMessage, []byte(ec.msg))
if err != nil {
return err
}
_, resp, err := conn.ReadMessage()
if err != nil {
return err
}
for _, line := range strings.Split(string(resp), "\n") {
if line != "" {
if w != nil {
fmt.Fprintf(w, "[%d body] %s\n", i, line)
}
}
}
return nil
}
func (ec *EchoClient) makeGRPCRequest(i int, w io.Writer) error {
req := &echopb.EchoRequest{Message: fmt.Sprintf("request #%d", i)}
//log.Printf("[%d] grpcecho.Echo(%v)\n", i, req)
resp, err := ec.grpcClient.Echo(context.Background(), req)
if err != nil {
return err
}
// when the underlying HTTP2 request returns status 404, GRPC
// request does not return an error in grpc-go.
// instead it just returns an empty response
for _, line := range strings.Split(resp.GetMessage(), "\n") {
if line != "" {
if w != nil {
fmt.Fprintf(w, "[%d body] %s\n", i, line)
}
}
}
return nil
}
// Initialize the http/ws/grpc client and return the function to call.
func (ec *EchoClient) setupDefaultTest() (job, error) {
if strings.HasPrefix(ec.url, "http://") || strings.HasPrefix(ec.url, "https://") {
/* #nosec */
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
},
Timeout: ec.timeout,
}
ec.httpClient = client
return ec.makeHTTPRequest, nil
} else if strings.HasPrefix(ec.url, "grpc://") || strings.HasPrefix(ec.url, "grpcs://") {
secure := strings.HasPrefix(ec.url, "grpcs://")
var address string
if secure {
address = ec.url[len("grpcs://"):]
} else {
address = ec.url[len("grpc://"):]
}
// grpc-go sets incorrect authority header
authority := address
if ec.headerKey == hostKey {
authority = ec.headerVal
}
// transport security
security := grpc.WithInsecure()
if secure {
creds, err := credentials.NewClientTLSFromFile(ec.caFile, authority)
if err != nil {
return nil, err
}
security = grpc.WithTransportCredentials(creds)
}
var err error
ctx, cancel := context.WithTimeout(context.Background(), ec.timeout)
defer cancel()
ec.grpcConn, err = grpc.DialContext(ctx, address,
security,
grpc.WithAuthority(authority),
grpc.WithBlock())
if err != nil {
return nil, err
}
client := echopb.NewEchoTestServiceClient(ec.grpcConn)
ec.grpcClient = client
return ec.makeGRPCRequest, nil
} else if strings.HasPrefix(ec.url, "ws://") || strings.HasPrefix(ec.url, "wss://") {
/* #nosec */
client := &websocket.Dialer{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
HandshakeTimeout: ec.timeout,
}
ec.wsClient = client
return ec.makeWebSocketRequest, nil
}
return nil, fmt.Errorf("invalid URL %s", ec.url)
}
func echoClientHandler(w http.ResponseWriter, r *http.Request) {
//flag.IntVar(&count, "count", 1, "Number of times to make the request")
//flag.IntVar(&qps, "qps", 0, "Queries per second")
//flag.DurationVar(&timeout, "timeout", 15*time.Second, "Request timeout")
//flag.StringVar(&url, "url", "", "Specify URL")
//flag.StringVar(&headerKey, "key", "", "Header key (use Host for authority)")
//flag.StrinproxyUrlgVar(&headerVal, "val", "", "Header value")
//flag.StringVar(&caFile, "ca", "/cert.crt", "CA root cert file")
//flag.StringVar(&msg, "msg", "HelloWorld", "message to send (for websockets)")
r.ParseForm()
// ca not yet supported
ec := &EchoClient{
url: r.FormValue("url"),
headerKey: r.FormValue("key"),
headerVal: r.FormValue("val"),
msg: r.FormValue("msg"),
timeout: 15 * time.Second,
}
qpsS := r.FormValue("qps")
if len(qpsS) > 0 {
ec.qps, _ = strconv.Atoi(qpsS)
}
countS := r.FormValue("count")
if len(qpsS) > 0 {
ec.count, _ = strconv.Atoi(countS)
}
j, err := ec.setupDefaultTest()
if j == nil {
fmt.Fprintf(w, "Error: %v", err)
w.WriteHeader(501)
return
}
defer func() {
if ec.grpcConn != nil {
if err1 := ec.grpcConn.Close(); err1 != nil {
log.Println(err1)
}
}
}()
if ec.qps == 0 {
// one request
err = j(0, w)
} else {
sleepTime := time.Second / time.Duration(ec.qps)
//log.Printf("Sleeping %v between requests\n", sleepTime)
throttle := time.Tick(sleepTime)
var wg sync.WaitGroup
var m sync.Mutex
for i := 0; i < ec.count; i++ {
<-throttle
wg.Add(1)
ic := i
go func() {
defer wg.Done()
e := j(ic, w)
if e != nil {
m.Lock()
err = e
m.Unlock()
}
}()
}
wg.Wait()
}
if err != nil {
fmt.Fprintf(w, "Error %s\n", err)
w.WriteHeader(500)
return
}
w.WriteHeader(200)
}