Beispiel #1
0
func findHandlerPB(w http.ResponseWriter, req *http.Request, responses []serverResponse) ([]*pb.GlobMatch, map[string][]string) {

	// metric -> [server1, ... ]
	paths := make(map[string][]string)
	seen := make(map[nameleaf]bool)

	var metrics []*pb.GlobMatch
	for _, r := range responses {
		var metric pb.GlobResponse
		err := metric.Unmarshal(r.response)
		if err != nil && req != nil {
			logger.Logf("error decoding protobuf response from server:%s: req:%s: err=%s", r.server, req.URL.RequestURI(), err)
			logger.Traceln("\n" + hex.Dump(r.response))
			Metrics.FindErrors.Add(1)
			continue
		}

		for _, match := range metric.Matches {
			n := nameleaf{*match.Path, *match.IsLeaf}
			_, ok := seen[n]
			if !ok {
				// we haven't seen this name yet
				// add the metric to the list of metrics to return
				metrics = append(metrics, match)
				seen[n] = true
			}
			// add the server to the list of servers that know about this metric
			p := paths[*match.Path]
			p = append(p, r.server)
			paths[*match.Path] = p
		}
	}

	return metrics, paths
}
Beispiel #2
0
func renderHandler(w http.ResponseWriter, r *http.Request, stats *renderStats) {

	Metrics.Requests.Add(1)

	err := r.ParseForm()
	if err != nil {
		http.Error(w, http.StatusText(http.StatusBadRequest)+": "+err.Error(), http.StatusBadRequest)
		return
	}

	targets := r.Form["target"]
	from := r.FormValue("from")
	until := r.FormValue("until")
	format := r.FormValue("format")
	useCache := !expr.TruthyBool(r.FormValue("noCache"))

	var jsonp string

	if format == "json" {
		// TODO(dgryski): check jsonp only has valid characters
		jsonp = r.FormValue("jsonp")
	}

	if format == "" && (expr.TruthyBool(r.FormValue("rawData")) || expr.TruthyBool(r.FormValue("rawdata"))) {
		format = "raw"
	}

	if format == "" {
		format = "png"
	}

	cacheTimeout := int32(60)

	if tstr := r.FormValue("cacheTimeout"); tstr != "" {
		t, err := strconv.Atoi(tstr)
		if err != nil {
			logger.Logf("failed to parse cacheTimeout: %v: %v", tstr, err)
		} else {
			cacheTimeout = int32(t)
		}
	}

	// make sure the cache key doesn't say noCache, because it will never hit
	r.Form.Del("noCache")

	// jsonp callback names are frequently autogenerated and hurt our cache
	r.Form.Del("jsonp")

	// Strip some cache-busters.  If you don't want to cache, use noCache=1
	r.Form.Del("_salt")
	r.Form.Del("_ts")
	r.Form.Del("_t") // Used by jquery.graphite.js

	cacheKey := r.Form.Encode()

	if response, ok := queryCache.get(cacheKey); useCache && ok {
		Metrics.RequestCacheHits.Add(1)
		writeResponse(w, response, format, jsonp)
		return
	}

	// normalize from and until values
	// BUG(dgryski): doesn't handle timezones the same as graphite-web
	from32 := dateParamToEpoch(from, timeNow().Add(-24*time.Hour).Unix())
	until32 := dateParamToEpoch(until, timeNow().Unix())
	if from32 == until32 {
		http.Error(w, "Invalid empty time range", http.StatusBadRequest)
		return
	}

	var results []*expr.MetricData
	var errors []string
	metricMap := make(map[expr.MetricRequest][]*expr.MetricData)

	for _, target := range targets {

		exp, e, err := expr.ParseExpr(target)

		if err != nil || e != "" {
			msg := buildParseErrorString(target, e, err)
			http.Error(w, msg, http.StatusBadRequest)
			return
		}

		for _, m := range exp.Metrics() {

			mfetch := m
			mfetch.From += from32
			mfetch.Until += until32

			if _, ok := metricMap[mfetch]; ok {
				// already fetched this metric for this request
				continue
			}

			var glob pb.GlobResponse
			var haveCacheData bool

			if response, ok := findCache.get(m.Metric); useCache && ok {
				Metrics.FindCacheHits.Add(1)
				err := glob.Unmarshal(response)
				haveCacheData = err == nil
			}

			if !haveCacheData {
				var err error
				Metrics.FindRequests.Add(1)
				stats.zipperRequests++
				glob, err = Zipper.Find(m.Metric)
				if err != nil {
					logger.Logf("Find: %v: %v", m.Metric, err)
					continue
				}
				b, err := glob.Marshal()
				if err == nil {
					findCache.set(m.Metric, b, 5*60)
				}
			}

			// For each metric returned in the Find response, query Render
			// This is a conscious decision to *not* cache render data
			rch := make(chan *expr.MetricData, len(glob.GetMatches()))
			leaves := 0
			for _, m := range glob.GetMatches() {
				if !m.GetIsLeaf() {
					continue
				}
				Metrics.RenderRequests.Add(1)
				leaves++
				Limiter.enter()
				stats.zipperRequests++
				go func(m *pb.GlobMatch, from, until int32) {
					var rptr *expr.MetricData
					r, err := Zipper.Render(m.GetPath(), from, until)
					if err == nil {
						rptr = &r
					} else {
						logger.Logf("Render: %v: %v", m.GetPath(), err)
					}
					rch <- rptr
					Limiter.leave()
				}(m, mfetch.From, mfetch.Until)
			}

			for i := 0; i < leaves; i++ {
				r := <-rch
				if r != nil {
					metricMap[mfetch] = append(metricMap[mfetch], r)
				}
			}

			expr.SortMetrics(metricMap[mfetch], mfetch)

		}

		func() {
			defer func() {
				if r := recover(); r != nil {
					var buf [1024]byte
					runtime.Stack(buf[:], false)
					logger.Logf("panic during eval: %s: %s\n%s\n", cacheKey, r, string(buf[:]))
				}
			}()
			exprs, err := expr.EvalExpr(exp, from32, until32, metricMap)
			if err != nil && err != expr.ErrSeriesDoesNotExist {
				errors = append(errors, target+": "+err.Error())
				return
			}
			results = append(results, exprs...)
		}()
	}

	if len(errors) > 0 {
		errors = append([]string{"Encountered the following errors:"}, errors...)
		http.Error(w, strings.Join(errors, "\n"), http.StatusBadRequest)
		return
	}

	var body []byte

	switch format {
	case "json":
		if maxDataPoints, _ := strconv.Atoi(r.FormValue("maxDataPoints")); maxDataPoints != 0 {
			expr.ConsolidateJSON(maxDataPoints, results)
		}

		body = expr.MarshalJSON(results)
	case "protobuf":
		body, err = expr.MarshalProtobuf(results)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	case "raw":
		body = expr.MarshalRaw(results)
	case "csv":
		body = expr.MarshalCSV(results)
	case "pickle":
		body = expr.MarshalPickle(results)
	case "png":
		body = expr.MarshalPNG(r, results)
	case "svg":
		body = expr.MarshalSVG(r, results)
	}

	writeResponse(w, body, format, jsonp)

	if len(results) != 0 {
		queryCache.set(cacheKey, body, cacheTimeout)
	}
}