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build.go
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build.go
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// Copyright 2019 Drone IO, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package events
import (
"context"
"io"
"net/http"
"time"
"github.com/ozonep/drone/core"
"github.com/ozonep/drone/handler/api/render"
"github.com/ozonep/drone/logger"
"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
// 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")
}
}