cloudflared-mirror/origin/proxy_test.go

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package origin
import (
"bytes"
"context"
"flag"
"fmt"
"io"
"net"
"net/http"
"net/http/httptest"
"strings"
"sync"
"testing"
"time"
"github.com/gobwas/ws/wsutil"
gorillaWS "github.com/gorilla/websocket"
"github.com/rs/zerolog"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/urfave/cli/v2"
"golang.org/x/sync/errgroup"
"github.com/cloudflare/cloudflared/config"
"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/hello"
"github.com/cloudflare/cloudflared/ingress"
"github.com/cloudflare/cloudflared/logger"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
)
var (
testTags = []tunnelpogs.Tag{tunnelpogs.Tag{Name: "Name", Value: "value"}}
unusedWarpRoutingService = (*ingress.WarpRoutingService)(nil)
)
type mockHTTPRespWriter struct {
*httptest.ResponseRecorder
}
func newMockHTTPRespWriter() *mockHTTPRespWriter {
return &mockHTTPRespWriter{
httptest.NewRecorder(),
}
}
func (w *mockHTTPRespWriter) WriteResponse() error {
return nil
}
func (w *mockHTTPRespWriter) WriteRespHeaders(status int, header http.Header) error {
w.WriteHeader(status)
for header, val := range header {
w.Header()[header] = val
}
return nil
}
func (w *mockHTTPRespWriter) Read(data []byte) (int, error) {
return 0, fmt.Errorf("mockHTTPRespWriter doesn't implement io.Reader")
}
type mockWSRespWriter struct {
*mockHTTPRespWriter
writeNotification chan []byte
reader io.Reader
}
func newMockWSRespWriter(reader io.Reader) *mockWSRespWriter {
return &mockWSRespWriter{
newMockHTTPRespWriter(),
make(chan []byte),
reader,
}
}
func (w *mockWSRespWriter) Write(data []byte) (int, error) {
w.writeNotification <- data
return len(data), nil
}
func (w *mockWSRespWriter) respBody() io.ReadWriter {
data := <-w.writeNotification
return bytes.NewBuffer(data)
}
func (w *mockWSRespWriter) Close() error {
close(w.writeNotification)
return nil
}
func (w *mockWSRespWriter) Read(data []byte) (int, error) {
return w.reader.Read(data)
}
type mockSSERespWriter struct {
*mockHTTPRespWriter
writeNotification chan []byte
}
func newMockSSERespWriter() *mockSSERespWriter {
return &mockSSERespWriter{
newMockHTTPRespWriter(),
make(chan []byte),
}
}
func (w *mockSSERespWriter) Write(data []byte) (int, error) {
w.writeNotification <- data
return len(data), nil
}
func (w *mockSSERespWriter) ReadBytes() []byte {
return <-w.writeNotification
}
func TestProxySingleOrigin(t *testing.T) {
log := zerolog.Nop()
ctx, cancel := context.WithCancel(context.Background())
flagSet := flag.NewFlagSet(t.Name(), flag.PanicOnError)
flagSet.Bool("hello-world", true, "")
cliCtx := cli.NewContext(cli.NewApp(), flagSet, nil)
err := cliCtx.Set("hello-world", "true")
require.NoError(t, err)
allowURLFromArgs := false
ingressRule, err := ingress.NewSingleOrigin(cliCtx, allowURLFromArgs)
require.NoError(t, err)
var wg sync.WaitGroup
errC := make(chan error)
require.NoError(t, ingressRule.StartOrigins(&wg, &log, ctx.Done(), errC))
proxy := NewOriginProxy(ingressRule, unusedWarpRoutingService, testTags, &log)
t.Run("testProxyHTTP", testProxyHTTP(proxy))
t.Run("testProxyWebsocket", testProxyWebsocket(proxy))
t.Run("testProxySSE", testProxySSE(proxy))
t.Run("testProxySSEAllData", testProxySSEAllData(proxy))
cancel()
wg.Wait()
}
func testProxyHTTP(proxy connection.OriginProxy) func(t *testing.T) {
return func(t *testing.T) {
responseWriter := newMockHTTPRespWriter()
req, err := http.NewRequest(http.MethodGet, "http://localhost:8080", nil)
require.NoError(t, err)
err = proxy.ProxyHTTP(responseWriter, req, false)
require.NoError(t, err)
for _, tag := range testTags {
assert.Equal(t, tag.Value, req.Header.Get(TagHeaderNamePrefix+tag.Name))
}
assert.Equal(t, http.StatusOK, responseWriter.Code)
}
}
func testProxyWebsocket(proxy connection.OriginProxy) func(t *testing.T) {
return func(t *testing.T) {
// WSRoute is a websocket echo handler
const testTimeout = 5 * time.Second * 1000
ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
defer cancel()
readPipe, writePipe := io.Pipe()
req, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("http://localhost:8080%s", hello.WSRoute), readPipe)
req.Header.Set("Sec-Websocket-Key", "dGhlIHNhbXBsZSBub25jZQ==")
req.Header.Set("Connection", "Upgrade")
req.Header.Set("Upgrade", "websocket")
responseWriter := newMockWSRespWriter(nil)
finished := make(chan struct{})
errGroup, ctx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
err = proxy.ProxyHTTP(responseWriter, req, true)
require.NoError(t, err)
require.Equal(t, http.StatusSwitchingProtocols, responseWriter.Code)
return nil
})
errGroup.Go(func() error {
select {
case <-finished:
case <-ctx.Done():
}
if ctx.Err() == context.DeadlineExceeded {
t.Errorf("Test timed out")
readPipe.Close()
writePipe.Close()
responseWriter.Close()
}
return nil
})
msg := []byte("test websocket")
err = wsutil.WriteClientText(writePipe, msg)
require.NoError(t, err)
// ReadServerText reads next data message from rw, considering that caller represents proxy side.
returnedMsg, err := wsutil.ReadServerText(responseWriter.respBody())
require.NoError(t, err)
require.Equal(t, msg, returnedMsg)
err = wsutil.WriteClientBinary(writePipe, msg)
require.NoError(t, err)
returnedMsg, err = wsutil.ReadServerBinary(responseWriter.respBody())
require.NoError(t, err)
require.Equal(t, msg, returnedMsg)
_ = readPipe.Close()
_ = writePipe.Close()
_ = responseWriter.Close()
close(finished)
errGroup.Wait()
}
}
func testProxySSE(proxy connection.OriginProxy) func(t *testing.T) {
return func(t *testing.T) {
var (
pushCount = 50
pushFreq = time.Millisecond * 10
)
responseWriter := newMockSSERespWriter()
ctx, cancel := context.WithCancel(context.Background())
req, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("http://localhost:8080%s?freq=%s", hello.SSERoute, pushFreq), nil)
require.NoError(t, err)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
err = proxy.ProxyHTTP(responseWriter, req, false)
require.NoError(t, err)
require.Equal(t, http.StatusOK, responseWriter.Code)
}()
for i := 0; i < pushCount; i++ {
line := responseWriter.ReadBytes()
expect := fmt.Sprintf("%d\n", i)
require.Equal(t, []byte(expect), line, fmt.Sprintf("Expect to read %v, got %v", expect, line))
line = responseWriter.ReadBytes()
require.Equal(t, []byte("\n"), line, fmt.Sprintf("Expect to read '\n', got %v", line))
}
cancel()
wg.Wait()
}
}
// Regression test to guarantee that we always write the contents downstream even if EOF is reached without
// hitting the delimiter
func testProxySSEAllData(proxy *Proxy) func(t *testing.T) {
return func(t *testing.T) {
eyeballReader := io.NopCloser(strings.NewReader("data\r\r"))
responseWriter := newMockSSERespWriter()
// responseWriter uses an unbuffered channel, so we call in a different go-routine
go proxy.writeEventStream(responseWriter, eyeballReader)
result := string(<-responseWriter.writeNotification)
require.Equal(t, "data\r\r", result)
}
}
func TestProxyMultipleOrigins(t *testing.T) {
api := httptest.NewServer(mockAPI{})
defer api.Close()
unvalidatedIngress := []config.UnvalidatedIngressRule{
{
Hostname: "api.example.com",
Service: api.URL,
},
{
Hostname: "hello.example.com",
Service: "hello-world",
},
{
Hostname: "health.example.com",
Path: "/health",
Service: "http_status:200",
},
{
Hostname: "*",
Service: "http_status:404",
},
}
tests := []MultipleIngressTest{
{
url: "http://api.example.com",
expectedStatus: http.StatusCreated,
expectedBody: []byte("Created"),
},
{
url: fmt.Sprintf("http://hello.example.com%s", hello.HealthRoute),
expectedStatus: http.StatusOK,
expectedBody: []byte("ok"),
},
{
url: "http://health.example.com/health",
expectedStatus: http.StatusOK,
},
{
url: "http://health.example.com/",
expectedStatus: http.StatusNotFound,
},
{
url: "http://not-found.example.com",
expectedStatus: http.StatusNotFound,
},
}
runIngressTestScenarios(t, unvalidatedIngress, tests)
}
type MultipleIngressTest struct {
url string
expectedStatus int
expectedBody []byte
}
func runIngressTestScenarios(t *testing.T, unvalidatedIngress []config.UnvalidatedIngressRule, tests []MultipleIngressTest) {
ingress, err := ingress.ParseIngress(&config.Configuration{
TunnelID: t.Name(),
Ingress: unvalidatedIngress,
})
require.NoError(t, err)
log := zerolog.Nop()
ctx, cancel := context.WithCancel(context.Background())
errC := make(chan error)
var wg sync.WaitGroup
require.NoError(t, ingress.StartOrigins(&wg, &log, ctx.Done(), errC))
proxy := NewOriginProxy(ingress, unusedWarpRoutingService, testTags, &log)
for _, test := range tests {
responseWriter := newMockHTTPRespWriter()
req, err := http.NewRequest(http.MethodGet, test.url, nil)
require.NoError(t, err)
err = proxy.ProxyHTTP(responseWriter, req, false)
require.NoError(t, err)
assert.Equal(t, test.expectedStatus, responseWriter.Code)
if test.expectedBody != nil {
assert.Equal(t, test.expectedBody, responseWriter.Body.Bytes())
} else {
assert.Equal(t, 0, responseWriter.Body.Len())
}
}
cancel()
wg.Wait()
}
type mockAPI struct{}
func (ma mockAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusCreated)
_, _ = w.Write([]byte("Created"))
}
type errorOriginTransport struct{}
func (errorOriginTransport) RoundTrip(*http.Request) (*http.Response, error) {
return nil, fmt.Errorf("Proxy error")
}
func TestProxyError(t *testing.T) {
ing := ingress.Ingress{
Rules: []ingress.Rule{
{
Hostname: "*",
Path: nil,
Service: ingress.MockOriginHTTPService{
Transport: errorOriginTransport{},
},
},
},
}
log := zerolog.Nop()
proxy := NewOriginProxy(ing, unusedWarpRoutingService, testTags, &log)
responseWriter := newMockHTTPRespWriter()
req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1", nil)
assert.NoError(t, err)
assert.Error(t, proxy.ProxyHTTP(responseWriter, req, false))
}
type replayer struct {
sync.RWMutex
writeDone chan struct{}
rw *bytes.Buffer
}
func newReplayer(buffer *bytes.Buffer) {
}
func (r *replayer) Read(p []byte) (int, error) {
r.RLock()
defer r.RUnlock()
return r.rw.Read(p)
}
func (r *replayer) Write(p []byte) (int, error) {
r.Lock()
defer r.Unlock()
n, err := r.rw.Write(p)
return n, err
}
func (r *replayer) String() string {
r.Lock()
defer r.Unlock()
return r.rw.String()
}
func (r *replayer) Bytes() []byte {
r.Lock()
defer r.Unlock()
return r.rw.Bytes()
}
// TestConnections tests every possible permutation of connection protocols
// proxied by cloudflared.
//
// WS - WS : When a websocket based ingress is configured on the origin and
// the eyeball is also a websocket client streaming data.
// TCP - TCP : When teamnet is enabled and an http or tcp service is running
// on the origin.
// TCP - WS: When teamnet is enabled and a websocket based service is running
// on the origin.
// WS - TCP: When a tcp based ingress is configured on the origin and the
// eyeball sends tcp packets wrapped in websockets. (E.g: cloudflared access).
func TestConnections(t *testing.T) {
logger := logger.Create(nil)
replayer := &replayer{rw: &bytes.Buffer{}}
type args struct {
ingressServiceScheme string
originService func(*testing.T, net.Listener)
eyeballResponseWriter connection.ResponseWriter
eyeballRequestBody io.ReadCloser
// Can be set to nil to show warp routing is not enabled.
warpRoutingService *ingress.WarpRoutingService
// eyeball connection type.
connectionType connection.Type
// requestheaders to be sent in the call to proxy.Proxy
requestHeaders http.Header
}
type want struct {
message []byte
headers http.Header
err bool
}
var tests = []struct {
name string
args args
want want
}{
{
name: "ws-ws proxy",
args: args{
ingressServiceScheme: "ws://",
originService: runEchoWSService,
eyeballResponseWriter: newWSRespWriter(replayer),
eyeballRequestBody: newWSRequestBody([]byte("test1")),
connectionType: connection.TypeWebsocket,
requestHeaders: map[string][]string{
// Example key from https://tools.ietf.org/html/rfc6455#section-1.2
"Sec-Websocket-Key": {"dGhlIHNhbXBsZSBub25jZQ=="},
"Test-Cloudflared-Echo": {"Echo"},
},
},
want: want{
message: []byte("echo-test1"),
headers: map[string][]string{
"Connection": {"Upgrade"},
"Sec-Websocket-Accept": {"s3pPLMBiTxaQ9kYGzzhZRbK+xOo="},
"Upgrade": {"websocket"},
"Test-Cloudflared-Echo": {"Echo"},
},
},
},
{
name: "tcp-tcp proxy",
args: args{
ingressServiceScheme: "tcp://",
originService: runEchoTCPService,
eyeballResponseWriter: newTCPRespWriter(replayer),
eyeballRequestBody: newTCPRequestBody([]byte("test2")),
warpRoutingService: ingress.NewWarpRoutingService(),
connectionType: connection.TypeTCP,
requestHeaders: map[string][]string{
"Cf-Cloudflared-Proxy-Src": {"non-blank-value"},
},
},
want: want{
message: []byte("echo-test2"),
},
},
{
name: "tcp-ws proxy",
args: args{
ingressServiceScheme: "ws://",
originService: runEchoWSService,
// eyeballResponseWriter gets set after roundtrip dial.
eyeballRequestBody: newPipedWSRequestBody([]byte("test3")),
warpRoutingService: ingress.NewWarpRoutingService(),
requestHeaders: map[string][]string{
"Cf-Cloudflared-Proxy-Src": {"non-blank-value"},
},
connectionType: connection.TypeTCP,
},
want: want{
message: []byte("echo-test3"),
// We expect no headers here because they are sent back via
// the stream.
},
},
{
name: "ws-tcp proxy",
args: args{
ingressServiceScheme: "tcp://",
originService: runEchoTCPService,
eyeballResponseWriter: newWSRespWriter(replayer),
eyeballRequestBody: newWSRequestBody([]byte("test4")),
connectionType: connection.TypeWebsocket,
requestHeaders: map[string][]string{
// Example key from https://tools.ietf.org/html/rfc6455#section-1.2
"Sec-Websocket-Key": {"dGhlIHNhbXBsZSBub25jZQ=="},
},
},
want: want{
message: []byte("echo-test4"),
headers: map[string][]string{
"Connection": {"Upgrade"},
"Sec-Websocket-Accept": {"s3pPLMBiTxaQ9kYGzzhZRbK+xOo="},
"Upgrade": {"websocket"},
},
},
},
{
name: "tcp-tcp proxy without warpRoutingService enabled",
args: args{
ingressServiceScheme: "tcp://",
originService: runEchoTCPService,
eyeballResponseWriter: newTCPRespWriter(replayer),
eyeballRequestBody: newTCPRequestBody([]byte("test2")),
connectionType: connection.TypeTCP,
requestHeaders: map[string][]string{
"Cf-Cloudflared-Proxy-Src": {"non-blank-value"},
},
},
want: want{
message: []byte{},
err: true,
},
},
{
name: "ws-ws proxy when origin is different",
args: args{
ingressServiceScheme: "ws://",
originService: runEchoWSService,
eyeballResponseWriter: newWSRespWriter(replayer),
eyeballRequestBody: newWSRequestBody([]byte("test1")),
connectionType: connection.TypeWebsocket,
requestHeaders: map[string][]string{
// Example key from https://tools.ietf.org/html/rfc6455#section-1.2
"Sec-Websocket-Key": {"dGhlIHNhbXBsZSBub25jZQ=="},
"Origin": {"Different origin"},
},
},
want: want{
message: []byte("Forbidden\n"),
err: false,
headers: map[string][]string{
"Content-Length": {"10"},
"Content-Type": {"text/plain; charset=utf-8"},
"Sec-Websocket-Version": {"13"},
"X-Content-Type-Options": {"nosniff"},
},
},
},
{
name: "tcp-* proxy when origin service has already closed the connection/ is no longer running",
args: args{
ingressServiceScheme: "tcp://",
originService: func(t *testing.T, ln net.Listener) {
// closing the listener created by the test.
ln.Close()
},
eyeballResponseWriter: newTCPRespWriter(replayer),
eyeballRequestBody: newTCPRequestBody([]byte("test2")),
connectionType: connection.TypeTCP,
requestHeaders: map[string][]string{
"Cf-Cloudflared-Proxy-Src": {"non-blank-value"},
},
},
want: want{
message: []byte{},
err: true,
},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
ln, err := net.Listen("tcp", "127.0.0.1:0")
require.NoError(t, err)
// Starts origin service
test.args.originService(t, ln)
ingressRule := createSingleIngressConfig(t, test.args.ingressServiceScheme+ln.Addr().String())
var wg sync.WaitGroup
errC := make(chan error)
ingressRule.StartOrigins(&wg, logger, ctx.Done(), errC)
proxy := NewOriginProxy(ingressRule, test.args.warpRoutingService, testTags, logger)
dest := ln.Addr().String()
req, err := http.NewRequest(
http.MethodGet,
test.args.ingressServiceScheme+ln.Addr().String(),
test.args.eyeballRequestBody,
)
require.NoError(t, err)
req.Header = test.args.requestHeaders
respWriter := test.args.eyeballResponseWriter
if pipedReqBody, ok := test.args.eyeballRequestBody.(*pipedRequestBody); ok {
respWriter = newTCPRespWriter(pipedReqBody.pipedConn)
go func() {
resp := pipedReqBody.roundtrip(test.args.ingressServiceScheme + ln.Addr().String())
replayer.Write(resp)
}()
}
if test.args.connectionType == connection.TypeTCP {
rws := connection.NewHTTPResponseReadWriterAcker(respWriter, req)
err = proxy.ProxyTCP(ctx, rws, &connection.TCPRequest{Dest: dest})
} else {
err = proxy.ProxyHTTP(respWriter, req, test.args.connectionType == connection.TypeWebsocket)
}
cancel()
assert.Equal(t, test.want.err, err != nil)
assert.Equal(t, test.want.message, replayer.Bytes())
respPrinter := respWriter.(responsePrinter)
assert.Equal(t, test.want.headers, respPrinter.headers())
replayer.rw.Reset()
})
}
}
type requestBody struct {
pw *io.PipeWriter
pr *io.PipeReader
}
func newWSRequestBody(data []byte) *requestBody {
pr, pw := io.Pipe()
go wsutil.WriteClientBinary(pw, data)
return &requestBody{
pr: pr,
pw: pw,
}
}
func newTCPRequestBody(data []byte) *requestBody {
pr, pw := io.Pipe()
go pw.Write(data)
return &requestBody{
pr: pr,
pw: pw,
}
}
func (r *requestBody) Read(p []byte) (n int, err error) {
return r.pr.Read(p)
}
func (r *requestBody) Close() error {
r.pw.Close()
r.pr.Close()
return nil
}
type pipedRequestBody struct {
dialer gorillaWS.Dialer
pipedConn net.Conn
wsConn net.Conn
messageToWrite []byte
}
func newPipedWSRequestBody(data []byte) *pipedRequestBody {
conn1, conn2 := net.Pipe()
dialer := gorillaWS.Dialer{
NetDial: func(network, addr string) (net.Conn, error) {
return conn2, nil
},
}
return &pipedRequestBody{
dialer: dialer,
pipedConn: conn1,
wsConn: conn2,
messageToWrite: data,
}
}
func (p *pipedRequestBody) roundtrip(addr string) []byte {
header := http.Header{}
conn, resp, err := p.dialer.Dial(addr, header)
if err != nil {
panic(err)
}
defer conn.Close()
if resp.StatusCode != http.StatusSwitchingProtocols {
panic(fmt.Errorf("resp returned status code: %d", resp.StatusCode))
}
err = conn.WriteMessage(gorillaWS.TextMessage, p.messageToWrite)
if err != nil {
panic(err)
}
_, data, err := conn.ReadMessage()
if err != nil {
panic(err)
}
return data
}
func (p *pipedRequestBody) Read(data []byte) (n int, err error) {
return p.pipedConn.Read(data)
}
func (p *pipedRequestBody) Close() error {
return nil
}
type responsePrinter interface {
headers() http.Header
}
type wsRespWriter struct {
w io.Writer
responseHeaders http.Header
code int
}
// newWSRespWriter uses wsutil.WriteClientText to generate websocket frames.
// and wsutil.ReadClientText to translate frames from server to byte data.
// In essence, this acts as a wsClient.
func newWSRespWriter(w io.Writer) *wsRespWriter {
return &wsRespWriter{
w: w,
}
}
// Write is written to by ingress.Stream and serves as the output to the client.
func (w *wsRespWriter) Write(p []byte) (int, error) {
returnedMsg, err := wsutil.ReadServerBinary(bytes.NewBuffer(p))
if err != nil {
2021-11-12 15:38:06 +00:00
// The data was not returned by a websocket connection.
if err != io.ErrUnexpectedEOF {
return w.w.Write(p)
}
}
return w.w.Write(returnedMsg)
}
func (w *wsRespWriter) WriteRespHeaders(status int, header http.Header) error {
w.responseHeaders = header
w.code = status
return nil
}
// respHeaders is a test function to read respHeaders
func (w *wsRespWriter) headers() http.Header {
// Removing indeterminstic header because it cannot be asserted.
w.responseHeaders.Del("Date")
return w.responseHeaders
}
type mockTCPRespWriter struct {
w io.Writer
responseHeaders http.Header
code int
}
func newTCPRespWriter(w io.Writer) *mockTCPRespWriter {
return &mockTCPRespWriter{
w: w,
}
}
func (m *mockTCPRespWriter) Read(p []byte) (n int, err error) {
return len(p), nil
}
func (m *mockTCPRespWriter) Write(p []byte) (n int, err error) {
return m.w.Write(p)
}
func (m *mockTCPRespWriter) WriteRespHeaders(status int, header http.Header) error {
m.responseHeaders = header
m.code = status
return nil
}
// respHeaders is a test function to read respHeaders
func (m *mockTCPRespWriter) headers() http.Header {
return m.responseHeaders
}
func createSingleIngressConfig(t *testing.T, service string) ingress.Ingress {
ingressConfig := &config.Configuration{
Ingress: []config.UnvalidatedIngressRule{
{
Hostname: "*",
Service: service,
},
},
}
ingressRule, err := ingress.ParseIngress(ingressConfig)
require.NoError(t, err)
return ingressRule
}
func runEchoTCPService(t *testing.T, l net.Listener) {
go func() {
for {
conn, err := l.Accept()
require.NoError(t, err)
defer conn.Close()
for {
buf := make([]byte, 1024)
size, err := conn.Read(buf)
if err == io.EOF {
return
}
data := []byte("echo-")
data = append(data, buf[:size]...)
_, err = conn.Write(data)
if err != nil {
t.Log(err)
}
return
}
}
}()
}
func runEchoWSService(t *testing.T, l net.Listener) {
var upgrader = gorillaWS.Upgrader{
ReadBufferSize: 10,
WriteBufferSize: 10,
}
var ws = func(w http.ResponseWriter, r *http.Request) {
header := make(http.Header)
for k, vs := range r.Header {
if k == "Test-Cloudflared-Echo" {
header[k] = vs
}
}
conn, err := upgrader.Upgrade(w, r, header)
if err != nil {
t.Log(err)
return
}
defer conn.Close()
for {
messageType, p, err := conn.ReadMessage()
if err != nil {
return
}
data := []byte("echo-")
data = append(data, p...)
if err := conn.WriteMessage(messageType, data); err != nil {
return
}
}
}
server := http.Server{
Handler: http.HandlerFunc(ws),
}
go func() {
err := server.Serve(l)
require.NoError(t, err)
}()
}