harness-drone/server/ws.go
2015-05-11 00:45:31 -07:00

204 lines
3.9 KiB
Go

package server
import (
"bufio"
"net/http"
"strconv"
"time"
"github.com/drone/drone/eventbus"
log "github.com/Sirupsen/logrus"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
// "github.com/koding/websocketproxy"
)
const (
// Time allowed to write the message to the client.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the client.
pongWait = 60 * time.Second
// Send pings to client with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
}
// GetRepoEvents will upgrade the connection to a Websocket and will stream
// event updates to the browser.
func GetRepoEvents(c *gin.Context) {
bus := ToBus(c)
repo := ToRepo(c)
// upgrade the websocket
ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
c.Fail(400, err)
return
}
ticker := time.NewTicker(pingPeriod)
eventc := make(chan *eventbus.Event)
bus.Subscribe(eventc)
defer func() {
bus.Unsubscribe(eventc)
ticker.Stop()
ws.Close()
close(eventc)
log.Infof("closed websocket")
}()
go func() {
for {
select {
case <-c.Writer.CloseNotify():
ws.Close()
return
case event := <-eventc:
if event == nil {
log.Infof("closed websocket")
ws.Close()
return
}
if event.Kind == eventbus.EventRepo && event.Name == repo.FullName {
ws.WriteMessage(websocket.TextMessage, event.Msg)
break
}
case <-ticker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
err := ws.WriteMessage(websocket.PingMessage, []byte{})
if err != nil {
log.Infof("closed websocket")
ws.Close()
return
}
}
}
}()
readWebsocket(ws)
}
func GetStream(c *gin.Context) {
store := ToDatastore(c)
repo := ToRepo(c)
runner := ToRunner(c)
commitseq, _ := strconv.Atoi(c.Params.ByName("build"))
buildseq, _ := strconv.Atoi(c.Params.ByName("number"))
// agent, err := store.BuildAgent(repo.FullName, build)
// if err != nil {
// c.Fail(404, err)
// return
// }
commit, err := store.CommitSeq(repo, commitseq)
if err != nil {
c.Fail(404, err)
return
}
build, err := store.BuildSeq(commit, buildseq)
if err != nil {
c.Fail(404, err)
return
}
rc, err := runner.Logs(build)
if err != nil {
c.Fail(404, err)
return
}
// upgrade the websocket
ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
c.Fail(400, err)
return
}
var ticker = time.NewTicker(pingPeriod)
var out = make(chan []byte)
defer func() {
log.Infof("closed stdout websocket")
ticker.Stop()
rc.Close()
ws.Close()
}()
go func() {
for {
select {
case <-c.Writer.CloseNotify():
rc.Close()
ws.Close()
return
case line := <-out:
ws.WriteMessage(websocket.TextMessage, line)
case <-ticker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
err := ws.WriteMessage(websocket.PingMessage, []byte{})
if err != nil {
rc.Close()
ws.Close()
return
}
}
}
}()
go func() {
rd := bufio.NewReader(rc)
for {
str, err := rd.ReadBytes('\n')
if err != nil {
break
}
if len(str) == 0 {
break
}
out <- str
}
rc.Close()
ws.Close()
}()
readWebsocket(ws)
// url_, err := url.Parse("ws://" + agent.Addr)
// if err != nil {
// c.Fail(500, err)
// return
// }
// url_.Path = fmt.Sprintf("/stream/%s/%v/%v", repo.FullName, build, task)
// proxy := websocketproxy.NewProxy(url_)
// proxy.ServeHTTP(c.Writer, c.Request)
// log.Debugf("closed websocket")
}
// readWebsocket will block while reading the websocket data
func readWebsocket(ws *websocket.Conn) {
defer ws.Close()
ws.SetReadLimit(512)
ws.SetReadDeadline(time.Now().Add(pongWait))
ws.SetPongHandler(func(string) error {
ws.SetReadDeadline(time.Now().Add(pongWait))
return nil
})
for {
_, _, err := ws.ReadMessage()
if err != nil {
break
}
}
}