Add Gitter support

1 files changed, 220 insertions, 0 deletions

diff --git a/vendor/github.com/sromku/go-gitter/stream.go b/vendor/github.com/sromku/go-gitter/stream.go
new file mode 100644
index 00000000..5f1cd78f
--- /dev/null
+++ b/vendor/github.com/sromku/go-gitter/stream.go
@@ -0,0 +1,220 @@
+package gitter
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/mreiferson/go-httpclient"
+)
+
+var defaultConnectionWaitTime time.Duration = 3000 // millis
+var defaultConnectionMaxRetries = 5
+
+// Stream initialize stream
+func (gitter *Gitter) Stream(roomID string) *Stream {
+	return &Stream{
+		url:    streamBaseURL + "rooms/" + roomID + "/chatMessages",
+		Event:  make(chan Event),
+		gitter: gitter,
+		streamConnection: gitter.newStreamConnection(
+			defaultConnectionWaitTime,
+			defaultConnectionMaxRetries),
+	}
+}
+
+// Implemented to conform with https://developer.gitter.im/docs/streaming-api
+func (gitter *Gitter) Listen(stream *Stream) {
+
+	defer stream.destroy()
+
+	var reader *bufio.Reader
+	var gitterMessage Message
+	lastKeepalive := time.Now().Unix()
+
+	// connect
+	stream.connect()
+
+Loop:
+	for {
+
+		// if closed then stop trying
+		if stream.isClosed() {
+			stream.Event <- Event{
+				Data: &GitterConnectionClosed{},
+			}
+			break Loop
+		}
+
+		resp := stream.getResponse()
+		if resp.StatusCode != 200 {
+			gitter.log(fmt.Sprintf("Unexpected response code %v", resp.StatusCode))
+			continue
+		}
+
+		//"The JSON stream returns messages as JSON objects that are delimited by carriage return (\r)" <- Not true crap it's (\n) only
+		reader = bufio.NewReader(resp.Body)
+		line, err := reader.ReadBytes('\n')
+
+		//Check if the line only consists of whitespace
+		onlyWhitespace := true
+		for _, b := range line {
+			if b != ' ' && b != '\t' && b != '\r' && b != '\n' {
+				onlyWhitespace = false
+			}
+		}
+
+		if onlyWhitespace {
+			//"Parsers must be tolerant of occasional extra newline characters placed between messages."
+			currentKeepalive := time.Now().Unix() //interesting behavior of 100+ keepalives per seconds was observed
+			if currentKeepalive-lastKeepalive > 10 {
+				lastKeepalive = currentKeepalive
+				gitter.log("Keepalive was received")
+			}
+			continue
+		} else if stream.isClosed() {
+			gitter.log("Stream closed")
+			continue
+		} else if err != nil {
+			gitter.log("ReadBytes error: " + err.Error())
+			stream.connect()
+			continue
+		}
+
+		// unmarshal the streamed data
+		err = json.Unmarshal(line, &gitterMessage)
+		if err != nil {
+			gitter.log("JSON Unmarshal error: " + err.Error())
+			continue
+		}
+
+		// we are here, then we got the good message. pipe it forward.
+		stream.Event <- Event{
+			Data: &MessageReceived{
+				Message: gitterMessage,
+			},
+		}
+	}
+
+	gitter.log("Listening was completed")
+}
+
+// Stream holds stream data.
+type Stream struct {
+	url              string
+	Event            chan Event
+	streamConnection *streamConnection
+	gitter           *Gitter
+}
+
+func (stream *Stream) destroy() {
+	close(stream.Event)
+}
+
+type Event struct {
+	Data interface{}
+}
+
+type GitterConnectionClosed struct {
+}
+
+type MessageReceived struct {
+	Message Message
+}
+
+// connect and try to reconnect with
+func (stream *Stream) connect() {
+
+	if stream.streamConnection.retries == stream.streamConnection.currentRetries {
+		stream.Close()
+		stream.gitter.log("Number of retries exceeded the max retries number, we are done here")
+		return
+	}
+
+	res, err := stream.gitter.getResponse(stream.url, stream)
+	if stream.streamConnection.canceled {
+		// do nothing
+	} else if err != nil || res.StatusCode != 200 {
+		stream.gitter.log("Failed to get response, trying reconnect ")
+		stream.gitter.log(err)
+
+		// sleep and wait
+		stream.streamConnection.currentRetries++
+		time.Sleep(time.Millisecond * stream.streamConnection.wait * time.Duration(stream.streamConnection.currentRetries))
+
+		// connect again
+		stream.Close()
+		stream.connect()
+	} else {
+		stream.gitter.log("Response was received")
+		stream.streamConnection.currentRetries = 0
+		stream.streamConnection.closed = false
+		stream.streamConnection.response = res
+	}
+}
+
+type streamConnection struct {
+
+	// connection was closed
+	closed bool
+
+	// canceled
+	canceled bool
+
+	// wait time till next try
+	wait time.Duration
+
+	// max tries to recover
+	retries int
+
+	// current streamed response
+	response *http.Response
+
+	// current request
+	request *http.Request
+
+	// current status
+	currentRetries int
+}
+
+// Close the stream connection and stop receiving streamed data
+func (stream *Stream) Close() {
+	conn := stream.streamConnection
+	conn.closed = true
+	if conn.response != nil {
+		stream.gitter.log("Stream connection close response")
+		defer conn.response.Body.Close()
+	}
+	if conn.request != nil {
+		stream.gitter.log("Stream connection close request")
+		switch transport := stream.gitter.config.client.Transport.(type) {
+		case *httpclient.Transport:
+			stream.streamConnection.canceled = true
+			transport.CancelRequest(conn.request)
+		default:
+		}
+
+	}
+	conn.currentRetries = 0
+}
+
+func (stream *Stream) isClosed() bool {
+	return stream.streamConnection.closed
+}
+
+func (stream *Stream) getResponse() *http.Response {
+	return stream.streamConnection.response
+}
+
+// Optional, set stream connection properties
+// wait - time in milliseconds of waiting between reconnections. Will grow exponentially.
+// retries - number of reconnections retries before dropping the stream.
+func (gitter *Gitter) newStreamConnection(wait time.Duration, retries int) *streamConnection {
+	return &streamConnection{
+		closed:  true,
+		wait:    wait,
+		retries: retries,
+	}
+}