// Encoder creates a new styxproto.Encoder that traces messages
// before writing them to w.
func Encoder(w io.Writer, fn Func) *styxproto.Encoder {
rd, wr := io.Pipe()
encoder := styxproto.NewEncoder(wr)
decoder := styxproto.NewDecoderSize(rd, 8*kilobyte)
go func() {
for decoder.Next() {
fn(decoder.Msg())
styxproto.Write(w, decoder.Msg())
}
}()
return encoder
}
// Decoder creates a new styxproto.Decoder that traces messages
// received on r.
func Decoder(r io.Reader, fn Func) *styxproto.Decoder {
rd, wr := io.Pipe()
decoderInput := styxproto.NewDecoderSize(r, 8*kilobyte)
decoderTrace := styxproto.NewDecoderSize(rd, 8*kilobyte)
go func() {
for decoderInput.Next() {
fn(decoderInput.Msg())
styxproto.Write(wr, decoderInput.Msg())
}
wr.Close()
}()
return decoderTrace
}
func copyMsg(msg styxproto.Msg) styxproto.Msg {
var err error
rd, wr := io.Pipe()
d := styxproto.NewDecoder(rd)
go func() {
_, err = styxproto.Write(wr, msg)
wr.CloseWithError(err)
}()
for d.Next() {
return d.Msg()
}
panic(fmt.Errorf("failed to copy %T message: %s", msg, d.Err()))
}
func chanServer(t *testing.T, handler Handler) (in, out chan styxproto.Msg) {
var ln netutil.PipeListener
// last for one session
srv := Server{
Handler: handler,
ErrorLog: testLogger{t},
}
go srv.Serve(&ln)
conn, err := ln.Dial()
if err != nil {
panic(err)
}
// NOTE(droyo) by buffering the channel we allow the server to take
// in multiple requests without being blocked on sending their responses.
// This is a compromise between keeping the messages in order and having
// an infinite buffer depth (such as with goroutine per channel). Good enough
// for testing.
out = make(chan styxproto.Msg, 1000)
in = make(chan styxproto.Msg)
go func() {
for req := range in {
if _, err := styxproto.Write(conn, req); err != nil {
t.Error(err)
break
}
}
conn.Close()
}()
go func() {
d := styxproto.NewDecoder(conn)
for d.Next() {
out <- copyMsg(d.Msg())
}
close(out)
}()
return in, out
}