func (fed *Federation) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	req.ParseForm()

	metrics := map[model.Fingerprint]metric.Metric{}

	for _, s := range req.Form["match[]"] {
		matchers, err := promql.ParseMetricSelector(s)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		for fp, met := range fed.Storage.MetricsForLabelMatchers(matchers...) {
			metrics[fp] = met
		}
	}

	format := expfmt.Negotiate(req.Header)
	w.Header().Set("Content-Type", string(format))

	enc := expfmt.NewEncoder(w, format)

	protMetric := &dto.Metric{
		Label:   []*dto.LabelPair{},
		Untyped: &dto.Untyped{},
	}
	protMetricFam := &dto.MetricFamily{
		Metric: []*dto.Metric{protMetric},
		Type:   dto.MetricType_UNTYPED.Enum(),
	}

	for fp, met := range metrics {
		sp := fed.Storage.LastSamplePairForFingerprint(fp)
		if sp == nil {
			continue
		}

		// Reset label slice.
		protMetric.Label = protMetric.Label[:0]

		for ln, lv := range met.Metric {
			if ln == model.MetricNameLabel {
				protMetricFam.Name = proto.String(string(lv))
				continue
			}
			protMetric.Label = append(protMetric.Label, &dto.LabelPair{
				Name:  proto.String(string(ln)),
				Value: proto.String(string(lv)),
			})
		}
		protMetric.TimestampMs = (*int64)(&sp.Timestamp)
		protMetric.Untyped.Value = (*float64)(&sp.Value)

		if err := enc.Encode(protMetricFam); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return

		}
	}
}
Beispiel #2
0
func (r *registry) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	contentType := expfmt.Negotiate(req.Header)
	buf := r.getBuf()
	defer r.giveBuf(buf)
	writer, encoding := decorateWriter(req, buf)
	if err := r.writePB(expfmt.NewEncoder(writer, contentType)); err != nil {
		if r.panicOnCollectError {
			panic(err)
		}
		http.Error(w, "An error has occurred:\n\n"+err.Error(), http.StatusInternalServerError)
		return
	}
	if closer, ok := writer.(io.Closer); ok {
		closer.Close()
	}
	header := w.Header()
	header.Set(contentTypeHeader, string(contentType))
	header.Set(contentLengthHeader, fmt.Sprint(buf.Len()))
	if encoding != "" {
		header.Set(contentEncodingHeader, encoding)
	}
	w.Write(buf.Bytes())
}
Beispiel #3
0
// UninstrumentedHandler returns an HTTP handler for the DefaultGatherer.
//
// Deprecated: Use promhttp.Handler instead. See there for further documentation.
func UninstrumentedHandler() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		mfs, err := DefaultGatherer.Gather()
		if err != nil {
			http.Error(w, "An error has occurred during metrics collection:\n\n"+err.Error(), http.StatusInternalServerError)
			return
		}

		contentType := expfmt.Negotiate(req.Header)
		buf := getBuf()
		defer giveBuf(buf)
		writer, encoding := decorateWriter(req, buf)
		enc := expfmt.NewEncoder(writer, contentType)
		var lastErr error
		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				lastErr = err
				http.Error(w, "An error has occurred during metrics encoding:\n\n"+err.Error(), http.StatusInternalServerError)
				return
			}
		}
		if closer, ok := writer.(io.Closer); ok {
			closer.Close()
		}
		if lastErr != nil && buf.Len() == 0 {
			http.Error(w, "No metrics encoded, last error:\n\n"+err.Error(), http.StatusInternalServerError)
			return
		}
		header := w.Header()
		header.Set(contentTypeHeader, string(contentType))
		header.Set(contentLengthHeader, fmt.Sprint(buf.Len()))
		if encoding != "" {
			header.Set(contentEncodingHeader, encoding)
		}
		w.Write(buf.Bytes())
	})
}
Beispiel #4
0
func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
	h.mtx.RLock()
	defer h.mtx.RUnlock()

	req.ParseForm()

	var matcherSets []metric.LabelMatchers
	for _, s := range req.Form["match[]"] {
		matchers, err := promql.ParseMetricSelector(s)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		matcherSets = append(matcherSets, matchers)
	}

	var (
		minTimestamp = h.now().Add(-promql.StalenessDelta)
		format       = expfmt.Negotiate(req.Header)
		enc          = expfmt.NewEncoder(w, format)
	)
	w.Header().Set("Content-Type", string(format))

	q, err := h.storage.Querier()
	if err != nil {
		federationErrors.Inc()
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer q.Close()

	vector, err := q.LastSampleForLabelMatchers(h.context, minTimestamp, matcherSets...)
	if err != nil {
		federationErrors.Inc()
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	sort.Sort(byName(vector))

	var (
		lastMetricName model.LabelValue
		protMetricFam  *dto.MetricFamily
	)
	for _, s := range vector {
		nameSeen := false
		globalUsed := map[model.LabelName]struct{}{}
		protMetric := &dto.Metric{
			Untyped: &dto.Untyped{},
		}

		for ln, lv := range s.Metric {
			if lv == "" {
				// No value means unset. Never consider those labels.
				// This is also important to protect against nameless metrics.
				continue
			}
			if ln == model.MetricNameLabel {
				nameSeen = true
				if lv == lastMetricName {
					// We already have the name in the current MetricFamily,
					// and we ignore nameless metrics.
					continue
				}
				// Need to start a new MetricFamily. Ship off the old one (if any) before
				// creating the new one.
				if protMetricFam != nil {
					if err := enc.Encode(protMetricFam); err != nil {
						federationErrors.Inc()
						log.With("err", err).Error("federation failed")
						return
					}
				}
				protMetricFam = &dto.MetricFamily{
					Type: dto.MetricType_UNTYPED.Enum(),
					Name: proto.String(string(lv)),
				}
				lastMetricName = lv
				continue
			}
			protMetric.Label = append(protMetric.Label, &dto.LabelPair{
				Name:  proto.String(string(ln)),
				Value: proto.String(string(lv)),
			})
			if _, ok := h.externalLabels[ln]; ok {
				globalUsed[ln] = struct{}{}
			}
		}
		if !nameSeen {
			log.With("metric", s.Metric).Warn("Ignoring nameless metric during federation.")
			continue
		}
		// Attach global labels if they do not exist yet.
		for ln, lv := range h.externalLabels {
			if _, ok := globalUsed[ln]; !ok {
				protMetric.Label = append(protMetric.Label, &dto.LabelPair{
					Name:  proto.String(string(ln)),
					Value: proto.String(string(lv)),
				})
			}
		}

		protMetric.TimestampMs = proto.Int64(int64(s.Timestamp))
		protMetric.Untyped.Value = proto.Float64(float64(s.Value))

		protMetricFam.Metric = append(protMetricFam.Metric, protMetric)
	}
	// Still have to ship off the last MetricFamily, if any.
	if protMetricFam != nil {
		if err := enc.Encode(protMetricFam); err != nil {
			federationErrors.Inc()
			log.With("err", err).Error("federation failed")
		}
	}
}
Beispiel #5
0
func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
	h.mtx.RLock()
	defer h.mtx.RUnlock()

	req.ParseForm()

	metrics := map[model.Fingerprint]metric.Metric{}

	for _, s := range req.Form["match[]"] {
		matchers, err := promql.ParseMetricSelector(s)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		for fp, met := range h.storage.MetricsForLabelMatchers(matchers...) {
			metrics[fp] = met
		}
	}

	format := expfmt.Negotiate(req.Header)
	w.Header().Set("Content-Type", string(format))

	enc := expfmt.NewEncoder(w, format)

	protMetric := &dto.Metric{
		Label:   []*dto.LabelPair{},
		Untyped: &dto.Untyped{},
	}
	protMetricFam := &dto.MetricFamily{
		Metric: []*dto.Metric{protMetric},
		Type:   dto.MetricType_UNTYPED.Enum(),
	}

	for fp, met := range metrics {
		globalUsed := map[model.LabelName]struct{}{}

		sp := h.storage.LastSamplePairForFingerprint(fp)
		if sp == nil {
			continue
		}

		// Reset label slice.
		protMetric.Label = protMetric.Label[:0]

		for ln, lv := range met.Metric {
			if ln == model.MetricNameLabel {
				protMetricFam.Name = proto.String(string(lv))
				continue
			}
			protMetric.Label = append(protMetric.Label, &dto.LabelPair{
				Name:  proto.String(string(ln)),
				Value: proto.String(string(lv)),
			})
			if _, ok := h.globalLabels[ln]; ok {
				globalUsed[ln] = struct{}{}
			}
		}

		// Attach global labels if they do not exist yet.
		for ln, lv := range h.globalLabels {
			if _, ok := globalUsed[ln]; !ok {
				protMetric.Label = append(protMetric.Label, &dto.LabelPair{
					Name:  proto.String(string(ln)),
					Value: proto.String(string(lv)),
				})
			}
		}

		protMetric.TimestampMs = (*int64)(&sp.Timestamp)
		protMetric.Untyped.Value = (*float64)(&sp.Value)

		if err := enc.Encode(protMetricFam); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}
Beispiel #6
0
func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
	h.mtx.RLock()
	defer h.mtx.RUnlock()

	req.ParseForm()

	fps := map[model.Fingerprint]struct{}{}

	for _, s := range req.Form["match[]"] {
		matchers, err := promql.ParseMetricSelector(s)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		for fp := range h.storage.MetricsForLabelMatchers(
			model.Now().Add(-promql.StalenessDelta), model.Latest,
			matchers...,
		) {
			fps[fp] = struct{}{}
		}
	}

	var (
		minTimestamp = model.Now().Add(-promql.StalenessDelta)
		format       = expfmt.Negotiate(req.Header)
		enc          = expfmt.NewEncoder(w, format)
	)
	w.Header().Set("Content-Type", string(format))

	protMetric := &dto.Metric{
		Label:   []*dto.LabelPair{},
		Untyped: &dto.Untyped{},
	}
	protMetricFam := &dto.MetricFamily{
		Metric: []*dto.Metric{protMetric},
		Type:   dto.MetricType_UNTYPED.Enum(),
	}

	for fp := range fps {
		globalUsed := map[model.LabelName]struct{}{}

		s := h.storage.LastSampleForFingerprint(fp)
		// Discard if sample does not exist or lays before the staleness interval.
		if s.Timestamp.Before(minTimestamp) {
			continue
		}

		// Reset label slice.
		protMetric.Label = protMetric.Label[:0]

		for ln, lv := range s.Metric {
			if ln == model.MetricNameLabel {
				protMetricFam.Name = proto.String(string(lv))
				continue
			}
			protMetric.Label = append(protMetric.Label, &dto.LabelPair{
				Name:  proto.String(string(ln)),
				Value: proto.String(string(lv)),
			})
			if _, ok := h.externalLabels[ln]; ok {
				globalUsed[ln] = struct{}{}
			}
		}

		// Attach global labels if they do not exist yet.
		for ln, lv := range h.externalLabels {
			if _, ok := globalUsed[ln]; !ok {
				protMetric.Label = append(protMetric.Label, &dto.LabelPair{
					Name:  proto.String(string(ln)),
					Value: proto.String(string(lv)),
				})
			}
		}

		protMetric.TimestampMs = proto.Int64(int64(s.Timestamp))
		protMetric.Untyped.Value = proto.Float64(float64(s.Value))

		if err := enc.Encode(protMetricFam); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}
Beispiel #7
-1
// HandlerFor returns an http.Handler for the provided Gatherer. The behavior
// of the Handler is defined by the provided HandlerOpts.
func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		mfs, err := reg.Gather()
		if err != nil {
			if opts.ErrorLog != nil {
				opts.ErrorLog.Println("error gathering metrics:", err)
			}
			switch opts.ErrorHandling {
			case PanicOnError:
				panic(err)
			case ContinueOnError:
				if len(mfs) == 0 {
					http.Error(w, "No metrics gathered, last error:\n\n"+err.Error(), http.StatusInternalServerError)
					return
				}
			case HTTPErrorOnError:
				http.Error(w, "An error has occurred during metrics gathering:\n\n"+err.Error(), http.StatusInternalServerError)
				return
			}
		}

		contentType := expfmt.Negotiate(req.Header)
		buf := getBuf()
		defer giveBuf(buf)
		writer, encoding := decorateWriter(req, buf, opts.DisableCompression)
		enc := expfmt.NewEncoder(writer, contentType)
		var lastErr error
		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				lastErr = err
				if opts.ErrorLog != nil {
					opts.ErrorLog.Println("error encoding metric family:", err)
				}
				switch opts.ErrorHandling {
				case PanicOnError:
					panic(err)
				case ContinueOnError:
					// Handled later.
				case HTTPErrorOnError:
					http.Error(w, "An error has occurred during metrics encoding:\n\n"+err.Error(), http.StatusInternalServerError)
					return
				}
			}
		}
		if closer, ok := writer.(io.Closer); ok {
			closer.Close()
		}
		if lastErr != nil && buf.Len() == 0 {
			http.Error(w, "No metrics encoded, last error:\n\n"+err.Error(), http.StatusInternalServerError)
			return
		}
		header := w.Header()
		header.Set(contentTypeHeader, string(contentType))
		header.Set(contentLengthHeader, fmt.Sprint(buf.Len()))
		if encoding != "" {
			header.Set(contentEncodingHeader, encoding)
		}
		w.Write(buf.Bytes())
		// TODO(beorn7): Consider streaming serving of metrics.
	})
}