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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package sessionrecording
import (
"bytes"
"context"
"crypto/rand"
"crypto/sha256"
"encoding/json"
"io"
"net"
"net/http"
"net/http/httptest"
"net/netip"
"testing"
"time"
"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
)
func TestConnectToRecorder(t *testing.T) {
tests := []struct {
desc string
http2 bool
// setup returns a recorder server mux, and a channel which sends the
// hash of the recording uploaded to it. The channel is expected to
// fire only once.
setup func(t *testing.T) (*http.ServeMux, <-chan []byte)
wantErr bool
}{
{
desc: "v1 recorder",
setup: func(t *testing.T) (*http.ServeMux, <-chan []byte) {
uploadHash := make(chan []byte, 1)
mux := http.NewServeMux()
mux.HandleFunc("POST /record", func(w http.ResponseWriter, r *http.Request) {
hash := sha256.New()
if _, err := io.Copy(hash, r.Body); err != nil {
t.Error(err)
}
uploadHash <- hash.Sum(nil)
})
return mux, uploadHash
},
},
{
desc: "v2 recorder",
http2: true,
setup: func(t *testing.T) (*http.ServeMux, <-chan []byte) {
uploadHash := make(chan []byte, 1)
mux := http.NewServeMux()
mux.HandleFunc("POST /record", func(w http.ResponseWriter, r *http.Request) {
t.Error("received request to v1 endpoint")
http.Error(w, "not found", http.StatusNotFound)
})
mux.HandleFunc("POST /v2/record", func(w http.ResponseWriter, r *http.Request) {
// Force the status to send to unblock the client waiting
// for it.
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
body := &readCounter{r: r.Body}
hash := sha256.New()
ctx, cancel := context.WithCancel(r.Context())
go func() {
defer cancel()
if _, err := io.Copy(hash, body); err != nil {
t.Error(err)
}
}()
// Send acks for received bytes.
tick := time.NewTicker(time.Millisecond)
defer tick.Stop()
enc := json.NewEncoder(w)
outer:
for {
select {
case <-ctx.Done():
break outer
case <-tick.C:
if err := enc.Encode(v2ResponseFrame{Ack: body.sent.Load()}); err != nil {
t.Errorf("writing ack frame: %v", err)
break outer
}
}
}
uploadHash <- hash.Sum(nil)
})
// Probing HEAD endpoint which always returns 200 OK.
mux.HandleFunc("HEAD /v2/record", func(http.ResponseWriter, *http.Request) {})
return mux, uploadHash
},
},
{
desc: "v2 recorder no acks",
http2: true,
wantErr: true,
setup: func(t *testing.T) (*http.ServeMux, <-chan []byte) {
// Make the client no-ack timeout quick for the test.
oldAckWindow := uploadAckWindow
uploadAckWindow = 100 * time.Millisecond
t.Cleanup(func() { uploadAckWindow = oldAckWindow })
uploadHash := make(chan []byte, 1)
mux := http.NewServeMux()
mux.HandleFunc("POST /record", func(w http.ResponseWriter, r *http.Request) {
t.Error("received request to v1 endpoint")
http.Error(w, "not found", http.StatusNotFound)
})
mux.HandleFunc("POST /v2/record", func(w http.ResponseWriter, r *http.Request) {
// Force the status to send to unblock the client waiting
// for it.
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
// Consume the whole request body but don't send any acks
// back.
hash := sha256.New()
if _, err := io.Copy(hash, r.Body); err != nil {
t.Error(err)
}
// Goes in the channel buffer, non-blocking.
uploadHash <- hash.Sum(nil)
// Block until the parent test case ends to prevent the
// request termination. We want to exercise the ack
// tracking logic specifically.
ctx, cancel := context.WithCancel(r.Context())
t.Cleanup(cancel)
<-ctx.Done()
})
mux.HandleFunc("HEAD /v2/record", func(http.ResponseWriter, *http.Request) {})
return mux, uploadHash
},
},
}
for _, tt := range tests {
t.Run(tt.desc, func(t *testing.T) {
mux, uploadHash := tt.setup(t)
srv := httptest.NewUnstartedServer(mux)
if tt.http2 {
// Wire up h2c-compatible HTTP/2 server. This is optional
// because the v1 recorder didn't support HTTP/2 and we try to
// mimic that.
h2s := &http2.Server{}
srv.Config.Handler = h2c.NewHandler(mux, h2s)
if err := http2.ConfigureServer(srv.Config, h2s); err != nil {
t.Errorf("configuring HTTP/2 support in server: %v", err)
}
}
srv.Start()
t.Cleanup(srv.Close)
d := new(net.Dialer)
ctx := context.Background()
w, _, errc, err := ConnectToRecorder(ctx, []netip.AddrPort{netip.MustParseAddrPort(srv.Listener.Addr().String())}, d.DialContext)
if err != nil {
t.Fatalf("ConnectToRecorder: %v", err)
}
// Send some random data and hash it to compare with the recorded
// data hash.
hash := sha256.New()
const numBytes = 1 << 20 // 1MB
if _, err := io.CopyN(io.MultiWriter(w, hash), rand.Reader, numBytes); err != nil {
t.Fatalf("writing recording data: %v", err)
}
if err := w.Close(); err != nil {
t.Fatalf("closing recording stream: %v", err)
}
if err := <-errc; err != nil && !tt.wantErr {
t.Fatalf("error from the channel: %v", err)
} else if err == nil && tt.wantErr {
t.Fatalf("did not receive expected error from the channel")
}
if recv, sent := <-uploadHash, hash.Sum(nil); !bytes.Equal(recv, sent) {
t.Errorf("mismatch in recording data hash, sent %x, received %x", sent, recv)
}
})
}
}
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