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