Beispiel #1
0
func (c *controllerAPI) AppLog(ctx context.Context, w http.ResponseWriter, req *http.Request) {
	ctx, cancel := context.WithCancel(ctx)

	opts := logagg.LogOpts{
		Follow: req.FormValue("follow") == "true",
		JobID:  req.FormValue("job_id"),
	}
	if vals, ok := req.Form["process_type"]; ok && len(vals) > 0 {
		opts.ProcessType = &vals[len(vals)-1]
	}
	if streamTypeVals := req.FormValue("stream_types"); streamTypeVals != "" {
		streamTypes := strings.Split(streamTypeVals, ",")
		opts.StreamTypes = make([]logagg.StreamType, len(streamTypes))
		for i, typ := range streamTypes {
			opts.StreamTypes[i] = logagg.StreamType(typ)
		}
	}
	if strLines := req.FormValue("lines"); strLines != "" {
		lines, err := strconv.Atoi(req.FormValue("lines"))
		if err != nil {
			respondWithError(w, err)
			return
		}
		opts.Lines = &lines
	}
	rc, err := c.logaggc.GetLog(c.getApp(ctx).ID, &opts)
	if err != nil {
		respondWithError(w, err)
		return
	}

	if cn, ok := w.(http.CloseNotifier); ok {
		ch := cn.CloseNotify()
		go func() {
			select {
			case <-ch:
				rc.Close()
			case <-ctx.Done():
			}
		}()
	}
	defer cancel()
	defer rc.Close()

	if !strings.Contains(req.Header.Get("Accept"), "text/event-stream") {
		w.Header().Set("Content-Type", "text/plain")
		w.WriteHeader(200)
		// Send headers right away if following
		if wf, ok := w.(http.Flusher); ok && opts.Follow {
			wf.Flush()
		}

		fw := httphelper.FlushWriter{Writer: w, Enabled: opts.Follow}
		io.Copy(fw, rc)
		return
	}

	ch := make(chan *ct.SSELogChunk)
	l, _ := ctxhelper.LoggerFromContext(ctx)
	s := sse.NewStream(w, ch, l)
	defer s.Close()
	s.Serve()

	msgc := make(chan *json.RawMessage)
	go func() {
		defer close(msgc)
		dec := json.NewDecoder(rc)
		for {
			var m json.RawMessage
			if err := dec.Decode(&m); err != nil {
				if err != io.EOF {
					l.Error("decoding logagg stream", err)
				}
				return
			}
			msgc <- &m
		}
	}()

	for {
		select {
		case m := <-msgc:
			if m == nil {
				ch <- &ct.SSELogChunk{Event: "eof"}
				return
			}
			// write to sse
			select {
			case ch <- &ct.SSELogChunk{Event: "message", Data: *m}:
			case <-s.Done:
				return
			case <-ctx.Done():
				return
			}
		case <-s.Done:
			return
		case <-ctx.Done():
			return
		}
	}
}
Beispiel #2
0
func runLog(args *docopt.Args, client controller.Client) error {
	rawOutput := args.Bool["--raw-output"]
	opts := logagg.LogOpts{
		Follow: args.Bool["--follow"],
		JobID:  args.String["--job"],
		StreamTypes: []logagg.StreamType{
			logagg.StreamTypeStdout,
			logagg.StreamTypeStderr,
		},
	}
	if ptype, ok := args.String["--process-type"]; ok {
		opts.ProcessType = &ptype
	}
	if strlines := args.String["--number"]; strlines != "" {
		lines, err := strconv.Atoi(strlines)
		if err != nil {
			return err
		}
		opts.Lines = &lines
	}
	if args.Bool["--init"] {
		opts.StreamTypes = append(opts.StreamTypes, logagg.StreamTypeInit)
	}
	rc, err := client.GetAppLog(mustApp(), &opts)
	if err != nil {
		return err
	}
	defer rc.Close()

	var stderr io.Writer = os.Stdout
	if args.Bool["--split-stderr"] {
		stderr = os.Stderr
	}
	var initOut io.Writer = ioutil.Discard
	if args.Bool["--init"] {
		initOut = os.Stderr
	}

	dec := json.NewDecoder(rc)
	for {
		var msg logaggc.Message
		err := dec.Decode(&msg)
		if err == io.EOF {
			return nil
		} else if err != nil {
			return err
		}

		var stream io.Writer
		switch msg.Stream {
		case logagg.StreamTypeStdout:
			stream = os.Stdout
		case logagg.StreamTypeStderr:
			stream = stderr
		case logagg.StreamTypeInit:
			stream = initOut
		default:
			continue
		}
		if rawOutput {
			fmt.Fprintln(stream, msg.Msg)
		} else {
			tstamp := msg.Timestamp.Format(rfc3339micro)
			fmt.Fprintf(stream, "%s %s[%s.%s]: %s\n",
				tstamp,
				msg.Source,
				msg.ProcessType,
				msg.JobID,
				msg.Msg,
			)
		}
	}
}