func TestCancelRequestOptimized(t *testing.T) {
r, w := io.Pipe()
c := &connection{
PeerMaxRequests: 1,
peerPieces: func() bitmap.Bitmap {
var bm bitmap.Bitmap
bm.Set(1, true)
return bm
}(),
rw: struct {
io.Reader
io.Writer
}{
Writer: w,
},
conn: new(net.TCPConn),
// For the locks
t: &Torrent{cl: &Client{}},
}
assert.Len(t, c.Requests, 0)
c.Request(newRequest(1, 2, 3))
require.Len(t, c.Requests, 1)
// Posting this message should removing the pending Request.
require.True(t, c.Cancel(newRequest(1, 2, 3)))
assert.Len(t, c.Requests, 0)
// Check that write optimization filters out the Request, due to the
// Cancel. We should have received an Interested, due to the initial
// request, and then keep-alives until we close the connection.
go c.writer(0)
b := make([]byte, 9)
n, err := io.ReadFull(r, b)
require.NoError(t, err)
require.EqualValues(t, len(b), n)
require.EqualValues(t, "\x00\x00\x00\x01\x02"+"\x00\x00\x00\x00", string(b))
time.Sleep(time.Millisecond)
c.mu().Lock()
c.Close()
c.mu().Unlock()
w.Close()
b, err = ioutil.ReadAll(r)
require.NoError(t, err)
// A single keep-alive will have gone through, as writer would be stuck
// trying to flush it, and then promptly close.
require.EqualValues(t, "\x00\x00\x00\x00", string(b))
}
func TestCancelRequestOptimized(t *testing.T) {
c := &connection{
PeerMaxRequests: 1,
peerPieces: func() bitmap.Bitmap {
var bm bitmap.Bitmap
bm.Set(1, true)
return bm
}(),
post: make(chan peer_protocol.Message),
writeCh: make(chan []byte),
}
assert.Len(t, c.Requests, 0)
// Keepalive timeout of 0 works because I'm just that good.
go c.writeOptimizer(0 * time.Millisecond)
c.Request(newRequest(1, 2, 3))
if len(c.Requests) != 1 {
t.Fatal("request was not posted")
}
// Posting this message should removing the pending Request.
if !c.Cancel(newRequest(1, 2, 3)) {
t.Fatal("request was not found")
}
// Check that the write optimization has filtered out the Request message.
for _, b := range []string{
// The initial request triggers an Interested message.
"\x00\x00\x00\x01\x02",
// Let a keep-alive through to verify there were no pending messages.
"\x00\x00\x00\x00",
} {
bb := string(<-c.writeCh)
if b != bb {
t.Fatalf("received message %q is not expected: %q", bb, b)
}
}
close(c.post)
// Drain the write channel until it closes.
for b := range c.writeCh {
bs := string(b)
if bs != "\x00\x00\x00\x00" {
t.Fatal("got unexpected non-keepalive")
}
}
}