106 lines
2.4 KiB
Go
106 lines
2.4 KiB
Go
|
// Copyright 2019 Drone.IO Inc. All rights reserved.
|
||
|
|
// Use of this source code is governed by the Drone Non-Commercial License
|
||
|
|
// that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package events
|
||
|
|
|
||
|
|
import (
|
||
|
|
"context"
|
||
|
|
"io"
|
||
|
|
"net/http"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/drone/drone/handler/api/render"
|
||
|
|
"github.com/drone/drone/logger"
|
||
|
|
"github.com/drone/drone/core"
|
||
|
|
"github.com/sirupsen/logrus"
|
||
|
|
|
||
|
|
"github.com/go-chi/chi"
|
||
|
|
)
|
||
|
|
|
||
|
|
// interval at which the client is pinged to prevent
|
||
|
|
// reverse proxy and load balancers from closing the
|
||
|
|
// connection.
|
||
|
|
var pingInterval = time.Second * 30
|
||
|
|
|
||
|
|
// implements a 24-hour timeout for connections. This
|
||
|
|
// should not be necessary, but is put in place just
|
||
|
|
// in case we encounter dangling connections.
|
||
|
|
var timeout = time.Hour * 24
|
||
|
|
|
||
|
|
// HandleEvents creates an http.HandlerFunc that streams builds events
|
||
|
|
// to the http.Response in an event stream format.
|
||
|
|
func HandleEvents(
|
||
|
|
repos core.RepositoryStore,
|
||
|
|
events core.Pubsub,
|
||
|
|
) http.HandlerFunc {
|
||
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
var (
|
||
|
|
namespace = chi.URLParam(r, "owner")
|
||
|
|
name = chi.URLParam(r, "name")
|
||
|
|
)
|
||
|
|
logger := logger.FromRequest(r).WithFields(
|
||
|
|
logrus.Fields{
|
||
|
|
"namespace": namespace,
|
||
|
|
"name": name,
|
||
|
|
},
|
||
|
|
)
|
||
|
|
repo, err := repos.FindName(r.Context(), namespace, name)
|
||
|
|
if err != nil {
|
||
|
|
render.NotFound(w, err)
|
||
|
|
logger.WithError(err).Debugln("events: cannot find repository")
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
h := w.Header()
|
||
|
|
h.Set("Content-Type", "text/event-stream")
|
||
|
|
h.Set("Cache-Control", "no-cache")
|
||
|
|
h.Set("Connection", "keep-alive")
|
||
|
|
h.Set("X-Accel-Buffering", "no")
|
||
|
|
|
||
|
|
f, ok := w.(http.Flusher)
|
||
|
|
if !ok {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
io.WriteString(w, ": ping\n\n")
|
||
|
|
f.Flush()
|
||
|
|
|
||
|
|
ctx, cancel := context.WithCancel(r.Context())
|
||
|
|
defer cancel()
|
||
|
|
|
||
|
|
events, errc := events.Subscribe(ctx)
|
||
|
|
logger.Debugln("events: stream opened")
|
||
|
|
|
||
|
|
L:
|
||
|
|
for {
|
||
|
|
select {
|
||
|
|
case <-ctx.Done():
|
||
|
|
logger.Debugln("events: stream cancelled")
|
||
|
|
break L
|
||
|
|
case <-errc:
|
||
|
|
logger.Debugln("events: stream error")
|
||
|
|
break L
|
||
|
|
case <-time.After(time.Hour):
|
||
|
|
logger.Debugln("events: stream timeout")
|
||
|
|
break L
|
||
|
|
case <-time.After(pingInterval):
|
||
|
|
io.WriteString(w, ": ping\n\n")
|
||
|
|
f.Flush()
|
||
|
|
case event := <-events:
|
||
|
|
if event.Repository == repo.Slug {
|
||
|
|
io.WriteString(w, "data: ")
|
||
|
|
w.Write(event.Data)
|
||
|
|
io.WriteString(w, "\n\n")
|
||
|
|
f.Flush()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
io.WriteString(w, "event: error\ndata: eof\n\n")
|
||
|
|
f.Flush()
|
||
|
|
|
||
|
|
logger.Debugln("events: stream closed")
|
||
|
|
}
|
||
|
|
}
|