コード例 #1
0
ファイル: query.go プロジェクト: pjjw/prometheus
func (serv MetricsService) Query(w http.ResponseWriter, r *http.Request) {
	setAccessControlHeaders(w)

	params := http_utils.GetQueryParams(r)
	expr := params.Get("expr")
	asText := params.Get("asText")

	var format ast.OutputFormat
	// BUG(julius): Use Content-Type negotiation.
	if asText == "" {
		format = ast.JSON
		w.Header().Set("Content-Type", "application/json")
	} else {
		format = ast.TEXT
		w.Header().Set("Content-Type", "text/plain")
	}

	exprNode, err := rules.LoadExprFromString(expr)
	if err != nil {
		fmt.Fprint(w, ast.ErrorToJSON(err))
		return
	}

	timestamp := clientmodel.TimestampFromTime(serv.time.Now())

	queryStats := stats.NewTimerGroup()
	result := ast.EvalToString(exprNode, timestamp, format, serv.Storage, queryStats)
	glog.Infof("Instant query: %s\nQuery stats:\n%s\n", expr, queryStats)
	fmt.Fprint(w, result)
}
コード例 #2
0
ファイル: targets.go プロジェクト: pjjw/prometheus
func (serv MetricsService) SetTargets(w http.ResponseWriter, r *http.Request) {
	params := http_utils.GetQueryParams(r)
	jobName := params.Get("job")

	decoder := json.NewDecoder(r.Body)
	var targetGroups []TargetGroup
	err := decoder.Decode(&targetGroups)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	job := serv.Config.GetJobByName(jobName)
	if job == nil {
		http.Error(w, "job not found", http.StatusNotFound)
		return
	}

	newTargets := []retrieval.Target{}

	for _, targetGroup := range targetGroups {
		// Do mandatory map type conversion due to Go shortcomings.
		baseLabels := clientmodel.LabelSet{
			clientmodel.JobLabel: clientmodel.LabelValue(job.GetName()),
		}
		for label, value := range targetGroup.BaseLabels {
			baseLabels[clientmodel.LabelName(label)] = clientmodel.LabelValue(value)
		}

		for _, endpoint := range targetGroup.Endpoints {
			newTarget := retrieval.NewTarget(endpoint, job.ScrapeTimeout(), baseLabels)
			newTargets = append(newTargets, newTarget)
		}
	}

	// BUG(julius): Validate that this ScrapeInterval is in fact the proper one
	// for the job.
	serv.TargetManager.ReplaceTargets(*job, newTargets)
}
コード例 #3
0
ファイル: query.go プロジェクト: pjjw/prometheus
func (serv MetricsService) QueryRange(w http.ResponseWriter, r *http.Request) {
	setAccessControlHeaders(w)
	w.Header().Set("Content-Type", "application/json")

	params := http_utils.GetQueryParams(r)
	expr := params.Get("expr")
	end, _ := strconv.ParseInt(params.Get("end"), 0, 64)
	duration, _ := strconv.ParseInt(params.Get("range"), 0, 64)
	step, _ := strconv.ParseInt(params.Get("step"), 0, 64)

	exprNode, err := rules.LoadExprFromString(expr)
	if err != nil {
		fmt.Fprint(w, ast.ErrorToJSON(err))
		return
	}
	if exprNode.Type() != ast.VECTOR {
		fmt.Fprint(w, ast.ErrorToJSON(errors.New("Expression does not evaluate to vector type")))
		return
	}

	if end == 0 {
		end = clientmodel.Now().Unix()
	}

	if step < 1 {
		step = 1
	}

	if end-duration < 0 {
		duration = end
	}

	// Align the start to step "tick" boundary.
	end -= end % step

	queryStats := stats.NewTimerGroup()

	evalTimer := queryStats.GetTimer(stats.TotalEvalTime).Start()
	matrix, err := ast.EvalVectorRange(
		exprNode.(ast.VectorNode),
		clientmodel.TimestampFromUnix(end-duration),
		clientmodel.TimestampFromUnix(end),
		time.Duration(step)*time.Second,
		serv.Storage,
		queryStats)
	if err != nil {
		fmt.Fprint(w, ast.ErrorToJSON(err))
		return
	}
	evalTimer.Stop()

	sortTimer := queryStats.GetTimer(stats.ResultSortTime).Start()
	sort.Sort(matrix)
	sortTimer.Stop()

	jsonTimer := queryStats.GetTimer(stats.JsonEncodeTime).Start()
	result := ast.TypedValueToJSON(matrix, "matrix")
	jsonTimer.Stop()

	glog.Infof("Range query: %s\nQuery stats:\n%s\n", expr, queryStats)
	fmt.Fprint(w, result)
}