Example #1
0
func (serv MetricsService) QueryRange(expr string, end int64, duration int64, step int64) string {
	exprNode, err := rules.LoadExprFromString(expr)
	if err != nil {
		return ast.ErrorToJSON(err)
	}
	if exprNode.Type() != ast.VECTOR {
		return ast.ErrorToJSON(errors.New("Expression does not evaluate to vector type"))
	}
	rb := serv.ResponseBuilder()
	rb.SetContentType(gorest.Application_Json)

	if end == 0 {
		end = serv.time.Now().Unix()
	}

	if step < 1 {
		step = 1
	}

	if end-duration < 0 {
		duration = end
	}

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

	matrix, err := ast.EvalVectorRange(
		exprNode.(ast.VectorNode),
		time.Unix(end-duration, 0),
		time.Unix(end, 0),
		time.Duration(step)*time.Second)
	if err != nil {
		return ast.ErrorToJSON(err)
	}

	sort.Sort(matrix)
	return ast.TypedValueToJSON(matrix, "matrix")
}
Example #2
0
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)
}
Example #3
0
// QueryRange handles the /api/query_range endpoint.
func (serv MetricsService) QueryRange(w http.ResponseWriter, r *http.Request) {
	setAccessControlHeaders(w)
	w.Header().Set("Content-Type", "application/json")

	params := httputils.GetQueryParams(r)
	expr := params.Get("expr")

	// Input times and durations are in seconds and get converted to nanoseconds.
	endFloat, _ := strconv.ParseFloat(params.Get("end"), 64)
	durationFloat, _ := strconv.ParseFloat(params.Get("range"), 64)
	stepFloat, _ := strconv.ParseFloat(params.Get("step"), 64)
	nanosPerSecond := int64(time.Second / time.Nanosecond)
	end := int64(endFloat) * nanosPerSecond
	duration := int64(durationFloat) * nanosPerSecond
	step := int64(stepFloat) * nanosPerSecond

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

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

	if step <= 0 {
		step = nanosPerSecond
	}

	if end-duration < 0 {
		duration = end
	}

	// For safety, limit the number of returned points per timeseries.
	// This is sufficient for 60s resolution for a week or 1h resolution for a year.
	if duration/step > 11000 {
		fmt.Fprint(w, ast.ErrorToJSON(errors.New("exceeded maximum resolution of 11,000 points per timeseries. Try decreasing the query resolution (?step=XX)")))
		return
	}

	// 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.TimestampFromUnixNano(end-duration),
		clientmodel.TimestampFromUnixNano(end),
		time.Duration(step),
		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.V(1).Infof("Range query: %s\nQuery stats:\n%s\n", expr, queryStats)
	fmt.Fprint(w, result)
}