func tcpShim(inbound, outbound *net.TCPConn, connEvent *events.Connection, eh events.Handler) error {
eh.Connection(connEvent)
ch := make(chan error, 1)
go func() {
var err error
defer func() { ch <- err }()
_, err = io.Copy(inbound, outbound)
outbound.CloseRead()
inbound.CloseWrite()
}()
_, err1 := io.Copy(outbound, inbound)
inbound.CloseRead()
outbound.CloseWrite()
err2 := <-ch
inbound.Close()
outbound.Close()
if err1 != nil {
return err1
} else {
return err2
}
}
func httpShim(inbound, outbound *net.TCPConn, connEvent *events.Connection, eh events.Handler) error {
eh.Connection(connEvent)
defer inbound.Close()
defer outbound.Close()
// Request handling and response handling take place in
// separate goroutines. This is not to support pipelining
// (although it could easily be extended to do so). Rather,
// it is to support cases where the server produces a response
// before the client is done sending the request (e.g. when
// the server produces an error response before reading the
// whole request).
type request struct {
req *http.Request
tReadReq time.Time
err error
}
reqCh := make(chan request)
doneCh := make(chan struct{})
defer close(doneCh)
passReq := func(req request) bool {
select {
case reqCh <- req:
return true
case <-doneCh:
return false
}
}
// The request handler loop
go func() {
reqrd := bufio.NewReader(inbound)
for {
// XXX timeout on no request
req, err := http.ReadRequest(reqrd)
if err != nil {
if err == io.EOF {
close(reqCh)
return
}
passReq(request{err: err})
return
}
if !passReq(request{req: req, tReadReq: time.Now()}) {
return
}
err = req.Write(outbound)
if err != nil {
passReq(request{err: err})
return
}
}
}()
// The response handler loop
resprd := bufio.NewReader(outbound)
for {
req, ok := <-reqCh
if !ok {
return nil
}
if req.err != nil {
return req.err
}
resp, err := http.ReadResponse(resprd, req.req)
tReadResponse := time.Now()
if err != nil {
return err
}
err = resp.Write(inbound)
tWroteResponse := time.Now()
if err != nil {
return err
}
eh.HttpExchange(&events.HttpExchange{
Connection: connEvent,
Request: req.req,
Response: resp,
RoundTrip: tReadResponse.Sub(req.tReadReq),
TotalTime: tWroteResponse.Sub(req.tReadReq),
})
}
}
