woodpecker/server/handler/ws.go

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package handler
import (
"log"
"net/http"
"strconv"
"time"
"github.com/drone/drone/server/datastore"
"github.com/drone/drone/server/pubsub"
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"github.com/drone/drone/server/worker"
"github.com/goji/context"
"github.com/gorilla/websocket"
"github.com/zenazn/goji/web"
)
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,
}
// WsUser will upgrade the connection to a Websocket and will stream
// all events to the browser pertinent to the authenticated user. If the user
// is not authenticated, only public events are streamed.
func WsUser(c web.C, w http.ResponseWriter, r *http.Request) {
var ctx = context.FromC(c)
var user = ToUser(c)
// upgrade the websocket
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
// register a channel for global events
channel := pubsub.Register(ctx, "_global")
sub := channel.Subscribe()
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
sub.Close()
ws.Close()
}()
go func() {
for {
select {
case msg := <-sub.Read():
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work, ok := msg.(*worker.Work)
if !ok {
break
}
// user must have read access to the repository
// in order to pass this message along
if role, err := datastore.GetPerm(ctx, user, work.Repo); err != nil || role.Read == false {
if err != nil {
log.Printf("WS: Error getting permissions for repository %s. Error: %s\n", work.Repo.Name, err)
} else {
log.Printf("WS: No read access for repository %s\n", work.Repo.Name)
}
break
}
ws.SetWriteDeadline(time.Now().Add(writeWait))
err := ws.WriteJSON(work)
if err != nil {
ws.Close()
return
}
case <-sub.CloseNotify():
ws.Close()
return
case <-ticker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
err := ws.WriteMessage(websocket.PingMessage, []byte{})
if err != nil {
ws.Close()
return
}
}
}
}()
readWebsocket(ws)
}
// WsConsole will upgrade the connection to a Websocket and will stream
// the build output to the browser.
func WsConsole(c web.C, w http.ResponseWriter, r *http.Request) {
var commitID, _ = strconv.Atoi(c.URLParams["id"])
var ctx = context.FromC(c)
var user = ToUser(c)
commit, err := datastore.GetCommit(ctx, int64(commitID))
if err != nil {
log.Printf("WS: Error retrieving commit by ID. %s\n", err)
w.WriteHeader(http.StatusNotFound)
return
}
repo, err := datastore.GetRepo(ctx, commit.RepoID)
if err != nil {
log.Printf("WS: Error retrieving repo by ID. %s\n", err)
w.WriteHeader(http.StatusNotFound)
return
}
role, err := datastore.GetPerm(ctx, user, repo)
if err != nil || role.Read == false {
if user == nil {
log.Println("WS: Error getting User session")
}
log.Println("WS: Error retrieving Read permission.", err)
w.WriteHeader(http.StatusNotFound)
return
}
// find a channel that we can subscribe to
// and listen for stream updates.
channel := pubsub.Lookup(ctx, commit.ID)
if channel == nil {
log.Println("WS: Error getting build stream from channel")
w.WriteHeader(http.StatusNotFound)
return
}
sub := channel.Subscribe()
defer sub.Close()
// upgrade the websocket
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
ws.Close()
}()
go func() {
for {
select {
case msg := <-sub.Read():
data, ok := msg.([]byte)
if !ok {
break
}
ws.SetWriteDeadline(time.Now().Add(writeWait))
err := ws.WriteMessage(websocket.TextMessage, data)
if err != nil {
ws.Close()
return
}
case <-sub.CloseNotify():
ws.Close()
return
case <-ticker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
err := ws.WriteMessage(websocket.PingMessage, []byte{})
if err != nil {
ws.Close()
return
}
}
}
}()
readWebsocket(ws)
}
// 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
}
}
}