コード例 #1
0
ファイル: app.go プロジェクト: imjorge/flynn
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
		}
	}
}
コード例 #2
0
ファイル: api.go プロジェクト: imjorge/flynn
func (a *aggregatorAPI) GetLog(ctx context.Context, w http.ResponseWriter, req *http.Request) {
	ctx, cancel := context.WithCancel(ctx)
	if cn, ok := w.(http.CloseNotifier); ok {
		ch := cn.CloseNotify()
		go func() {
			select {
			case <-ch:
				cancel()
			case <-ctx.Done():
			}
		}()
	}
	defer cancel()

	params, _ := ctxhelper.ParamsFromContext(ctx)

	follow := false
	if strFollow := req.FormValue("follow"); strFollow == "true" {
		follow = true
	}

	var (
		backlog bool
		lines   int
		err     error
	)
	if strLines := req.FormValue("lines"); strLines != "" {
		if lines, err = strconv.Atoi(strLines); err != nil {
			httphelper.ValidationError(w, "lines", err.Error())
			return
		}
		if lines < 0 || lines > 10000 {
			httphelper.ValidationError(w, "lines", "lines must be an integer between 0 and 10000")
			return
		}
		backlog = lines > 0
	}

	filters := make(filterSlice, 0)
	if jobID := req.FormValue("job_id"); jobID != "" {
		filters = append(filters, filterJobID(jobID))
	}
	if processTypeVals, ok := req.Form["process_type"]; ok && len(processTypeVals) > 0 {
		val := processTypeVals[len(processTypeVals)-1]
		filters = append(filters, filterProcessType(val))
	}
	if streamTypeVals := req.FormValue("stream_types"); streamTypeVals != "" {
		vals := strings.Split(streamTypeVals, ",")
		streamTypes := make([]logagg.StreamType, len(vals))
		for i, typ := range vals {
			streamTypes[i] = logagg.StreamType(typ)
		}
		filters = append(filters, filterStreamType(streamTypes...))
	}

	iter := &Iterator{
		id:      params.ByName("channel_id"),
		follow:  follow,
		backlog: backlog,
		lines:   lines,
		filter:  filters,
		donec:   ctx.Done(),
	}

	writeMessages(ctx, w, iter.Scan(a.agg))
}