Exemplo n.º 1
0
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)
}
Exemplo n.º 2
0
func (serv MetricsService) Query(expr string, formatJson string) (result string) {
	exprNode, err := rules.LoadExprFromString(expr)
	if err != nil {
		return ast.ErrorToJSON(err)
	}

	timestamp := serv.time.Now()

	rb := serv.ResponseBuilder()
	var format ast.OutputFormat
	if formatJson != "" {
		format = ast.JSON
		rb.SetContentType(gorest.Application_Json)
	} else {
		format = ast.TEXT
		rb.SetContentType(gorest.Text_Plain)
	}

	return ast.EvalToString(exprNode, timestamp, format)
}
Exemplo n.º 3
0
func TestExpressions(t *testing.T) {
	temporaryDirectory := test.NewTemporaryDirectory("rule_expression_tests", t)
	defer temporaryDirectory.Close()
	tieredStorage, err := metric.NewTieredStorage(5000, 5000, 100, time.Second*30, time.Second*1, time.Second*20, temporaryDirectory.Path())
	if err != nil {
		t.Fatalf("Error opening storage: %s", err)
	}
	go tieredStorage.Serve()

	ast.SetStorage(tieredStorage)

	storeMatrix(tieredStorage, testMatrix)
	tieredStorage.Flush()

	for i, exprTest := range expressionTests {
		expectedLines := annotateWithTime(exprTest.output)

		testExpr, err := LoadExprFromString(exprTest.expr)

		if err != nil {
			if exprTest.shouldFail {
				continue
			}
			t.Errorf("%d Error during parsing: %v", i, err)
			t.Errorf("%d Expression: %v", i, exprTest.expr)
		} else {
			if exprTest.shouldFail {
				t.Errorf("%d Test should fail, but didn't", i)
			}
			failed := false
			resultStr := ast.EvalToString(testExpr, testEvalTime, ast.TEXT)
			resultLines := strings.Split(resultStr, "\n")

			if len(exprTest.output) != len(resultLines) {
				t.Errorf("%d Number of samples in expected and actual output don't match", i)
				failed = true
			}

			if exprTest.checkOrder {
				for j, expectedSample := range expectedLines {
					if resultLines[j] != expectedSample {
						t.Errorf("%d.%d Expected sample '%v', got '%v'", i, j, resultLines[j], expectedSample)
						failed = true
					}
				}
			} else {
				for j, expectedSample := range expectedLines {
					found := false
					for _, actualSample := range resultLines {
						if actualSample == expectedSample {
							found = true
						}
					}
					if !found {
						t.Errorf("%d.%d Couldn't find expected sample in output: '%v'", i, j, expectedSample)
						failed = true
					}
				}
			}

			analyzer := ast.NewQueryAnalyzer()
			analyzer.AnalyzeQueries(testExpr)
			if exprTest.fullRanges != len(analyzer.FullRanges) {
				t.Errorf("%d Count of full ranges didn't match: %v vs %v", i, exprTest.fullRanges, len(analyzer.FullRanges))
				failed = true
			}
			if exprTest.intervalRanges != len(analyzer.IntervalRanges) {
				t.Errorf("%d Count of interval ranges didn't match: %v vs %v", i, exprTest.intervalRanges, len(analyzer.IntervalRanges))
				failed = true
			}

			if failed {
				t.Errorf("%d Expression: %v\n%v", i, exprTest.expr, vectorComparisonString(expectedLines, resultLines))
			}
		}
	}
}
Exemplo n.º 4
0
func TestExpressions(t *testing.T) {
	// Labels in expected output need to be alphabetically sorted.
	var expressionTests = []struct {
		expr           string
		output         []string
		shouldFail     bool
		checkOrder     bool
		fullRanges     int
		intervalRanges int
	}{
		{
			expr:           `SUM(http_requests)`,
			output:         []string{`http_requests => 3600 @[%v]`},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests{instance="0"}) BY(job)`,
			output: []string{
				`http_requests{job="api-server"} => 400 @[%v]`,
				`http_requests{job="app-server"} => 1200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `SUM(http_requests{instance="0"}) BY(job) KEEPING_EXTRA`,
			output: []string{
				`http_requests{instance="0", job="api-server"} => 400 @[%v]`,
				`http_requests{instance="0", job="app-server"} => 1200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `SUM(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 1000 @[%v]`,
				`http_requests{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// Non-existent labels mentioned in BY-clauses shouldn't propagate to output.
			expr: `SUM(http_requests) BY (job, nonexistent)`,
			output: []string{
				`http_requests{job="api-server"} => 1000 @[%v]`,
				`http_requests{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `
				// Test comment.
				SUM(http_requests) BY /* comments shouldn't
				have any effect */ (job) // another comment`,
			output: []string{
				`http_requests{job="api-server"} => 1000 @[%v]`,
				`http_requests{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `COUNT(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 4 @[%v]`,
				`http_requests{job="app-server"} => 4 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job, group)`,
			output: []string{
				`http_requests{group="canary", job="api-server"} => 700 @[%v]`,
				`http_requests{group="canary", job="app-server"} => 1500 @[%v]`,
				`http_requests{group="production", job="api-server"} => 300 @[%v]`,
				`http_requests{group="production", job="app-server"} => 1100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `AVG(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 250 @[%v]`,
				`http_requests{job="app-server"} => 650 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `MIN(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 100 @[%v]`,
				`http_requests{job="app-server"} => 500 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `MAX(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 400 @[%v]`,
				`http_requests{job="app-server"} => 800 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) - COUNT(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 996 @[%v]`,
				`http_requests{job="app-server"} => 2596 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `2 - SUM(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => -998 @[%v]`,
				`http_requests{job="app-server"} => -2598 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `1000 / SUM(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 1 @[%v]`,
				`http_requests{job="app-server"} => 0.38461538461538464 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) - 2`,
			output: []string{
				`http_requests{job="api-server"} => 998 @[%v]`,
				`http_requests{job="app-server"} => 2598 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) % 3`,
			output: []string{
				`http_requests{job="api-server"} => 1 @[%v]`,
				`http_requests{job="app-server"} => 2 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) / 0`,
			output: []string{
				`http_requests{job="api-server"} => +Inf @[%v]`,
				`http_requests{job="app-server"} => +Inf @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) > 1000`,
			output: []string{
				`http_requests{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `1000 < SUM(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="app-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) <= 1000`,
			output: []string{
				`http_requests{job="api-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) != 1000`,
			output: []string{
				`http_requests{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) == 1000`,
			output: []string{
				`http_requests{job="api-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) + SUM(http_requests) BY (job)`,
			output: []string{
				`http_requests{job="api-server"} => 2000 @[%v]`,
				`http_requests{job="app-server"} => 5200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `http_requests{job="api-server", group="canary"}`,
			output: []string{
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		}, {
			expr: `http_requests{job="api-server", group="canary"} + delta(http_requests{job="api-server"}[5m], 1)`,
			output: []string{
				`http_requests{group="canary", instance="0", job="api-server"} => 330 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 440 @[%v]`,
			},
			fullRanges:     4,
			intervalRanges: 0,
		}, {
			expr: `delta(http_requests[25m], 1)`,
			output: []string{
				`http_requests{group="canary", instance="0", job="api-server"} => 150 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 350 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="canary", instance="1", job="app-server"} => 400 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 50 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 250 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 100 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 300 @[%v]`,
			},
			fullRanges:     8,
			intervalRanges: 0,
		}, {
			expr: `sort(http_requests)`,
			output: []string{
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `sort_desc(http_requests)`,
			output: []string{
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// Single-letter label names and values.
			expr: `x{y="testvalue"}`,
			output: []string{
				`x{y="testvalue"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 1,
		}, {
			// Lower-cased aggregation operators should work too.
			expr: `sum(http_requests) by (job) + min(http_requests) by (job) + max(http_requests) by (job) + avg(http_requests) by (job)`,
			output: []string{
				`http_requests{job="app-server"} => 4550 @[%v]`,
				`http_requests{job="api-server"} => 1750 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// Deltas should be adjusted for target interval vs. samples under target interval.
			expr:           `delta(http_requests{group="canary", instance="1", job="app-server"}[18m], 1)`,
			output:         []string{`http_requests{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Rates should transform per-interval deltas to per-second rates.
			expr:           `rate(http_requests{group="canary", instance="1", job="app-server"}[10m])`,
			output:         []string{`http_requests{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Counter resets in middle of range are ignored by delta() if counter == 1.
			expr:           `delta(testcounter_reset_middle[50m], 1)`,
			output:         []string{`testcounter_reset_middle => 90 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Counter resets in middle of range are not ignored by delta() if counter == 0.
			expr:           `delta(testcounter_reset_middle[50m], 0)`,
			output:         []string{`testcounter_reset_middle => 50 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Counter resets at end of range are ignored by delta() if counter == 1.
			expr:           `delta(testcounter_reset_end[5m], 1)`,
			output:         []string{`testcounter_reset_end => 0 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Counter resets at end of range are not ignored by delta() if counter == 0.
			expr:           `delta(testcounter_reset_end[5m], 0)`,
			output:         []string{`testcounter_reset_end => -90 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// count_scalar for a non-empty vector should return scalar element count.
			expr:           `count_scalar(http_requests)`,
			output:         []string{`scalar: 8 @[%v]`},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// count_scalar for an empty vector should return scalar 0.
			expr:           `count_scalar(nonexistent)`,
			output:         []string{`scalar: 0 @[%v]`},
			fullRanges:     0,
			intervalRanges: 0,
		}, {
			// Empty expressions shouldn"t parse.
			expr:       ``,
			shouldFail: true,
		}, {
			// Interval durations can"t be in quotes.
			expr:       `http_requests["1m"]`,
			shouldFail: true,
		}, {
			// Binop arguments need to be scalar or vector.
			expr:       `http_requests - http_requests[1m]`,
			shouldFail: true,
		}, {
			expr: `http_requests{group!="canary"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `http_requests{job=~"server",group!="canary"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `http_requests{job!~"api",group!="canary"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		}, {
			expr:           `count_scalar(http_requests{job=~"^server$"})`,
			output:         []string{`scalar: 0 @[%v]`},
			fullRanges:     0,
			intervalRanges: 0,
		}, {
			expr: `http_requests{group="production",job=~"^api"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		},
	}

	tieredStorage, closer := newTestStorage(t)
	defer closer.Close()
	tieredStorage.Flush()

	for i, exprTest := range expressionTests {
		expectedLines := annotateWithTime(exprTest.output, testEvalTime)

		testExpr, err := LoadExprFromString(exprTest.expr)

		if err != nil {
			if exprTest.shouldFail {
				continue
			}
			t.Errorf("%d. Error during parsing: %v", i, err)
			t.Errorf("%d. Expression: %v", i, exprTest.expr)
		} else {
			if exprTest.shouldFail {
				t.Errorf("%d. Test should fail, but didn't", i)
			}
			failed := false
			resultStr := ast.EvalToString(testExpr, testEvalTime, ast.TEXT, tieredStorage, stats.NewTimerGroup())
			resultLines := strings.Split(resultStr, "\n")

			if len(exprTest.output) != len(resultLines) {
				t.Errorf("%d. Number of samples in expected and actual output don't match", i)
				failed = true
			}

			if exprTest.checkOrder {
				for j, expectedSample := range expectedLines {
					if resultLines[j] != expectedSample {
						t.Errorf("%d.%d. Expected sample '%v', got '%v'", i, j, resultLines[j], expectedSample)
						failed = true
					}
				}
			} else {
				for j, expectedSample := range expectedLines {
					found := false
					for _, actualSample := range resultLines {
						if actualSample == expectedSample {
							found = true
						}
					}
					if !found {
						t.Errorf("%d.%d. Couldn't find expected sample in output: '%v'", i, j, expectedSample)
						failed = true
					}
				}
			}

			analyzer := ast.NewQueryAnalyzer(tieredStorage)
			analyzer.AnalyzeQueries(testExpr)
			if exprTest.fullRanges != len(analyzer.FullRanges) {
				t.Errorf("%d. Count of full ranges didn't match: %v vs %v", i, exprTest.fullRanges, len(analyzer.FullRanges))
				failed = true
			}
			if exprTest.intervalRanges != len(analyzer.IntervalRanges) {
				t.Errorf("%d. Count of interval ranges didn't match: %v vs %v", i, exprTest.intervalRanges, len(analyzer.IntervalRanges))
				failed = true
			}

			if failed {
				t.Errorf("%d. Expression: %v\n%v", i, exprTest.expr, vectorComparisonString(expectedLines, resultLines))
			}
		}
	}
}
Exemplo n.º 5
0
func TestExpressions(t *testing.T) {
	// Labels in expected output need to be alphabetically sorted.
	expressionTests := []struct {
		expr           string
		output         []string
		shouldFail     bool
		checkOrder     bool
		fullRanges     int
		intervalRanges int
	}{
		{
			expr:           `SUM(http_requests)`,
			output:         []string{`{} => 3600 @[%v]`},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests{instance="0"}) BY(job)`,
			output: []string{
				`{job="api-server"} => 400 @[%v]`,
				`{job="app-server"} => 1200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `SUM(http_requests{instance="0"}) BY(job) KEEPING_EXTRA`,
			output: []string{
				`{instance="0", job="api-server"} => 400 @[%v]`,
				`{instance="0", job="app-server"} => 1200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `SUM(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 1000 @[%v]`,
				`{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// Non-existent labels mentioned in BY-clauses shouldn't propagate to output.
			expr: `SUM(http_requests) BY (job, nonexistent)`,
			output: []string{
				`{job="api-server"} => 1000 @[%v]`,
				`{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `
				// Test comment.
				SUM(http_requests) BY /* comments shouldn't
				have any effect */ (job) // another comment`,
			output: []string{
				`{job="api-server"} => 1000 @[%v]`,
				`{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `COUNT(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 4 @[%v]`,
				`{job="app-server"} => 4 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job, group)`,
			output: []string{
				`{group="canary", job="api-server"} => 700 @[%v]`,
				`{group="canary", job="app-server"} => 1500 @[%v]`,
				`{group="production", job="api-server"} => 300 @[%v]`,
				`{group="production", job="app-server"} => 1100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `AVG(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 250 @[%v]`,
				`{job="app-server"} => 650 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `MIN(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 100 @[%v]`,
				`{job="app-server"} => 500 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `MAX(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 400 @[%v]`,
				`{job="app-server"} => 800 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) - COUNT(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 996 @[%v]`,
				`{job="app-server"} => 2596 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `2 - SUM(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => -998 @[%v]`,
				`{job="app-server"} => -2598 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `1000 / SUM(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 1 @[%v]`,
				`{job="app-server"} => 0.38461538461538464 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) - 2`,
			output: []string{
				`{job="api-server"} => 998 @[%v]`,
				`{job="app-server"} => 2598 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) % 3`,
			output: []string{
				`{job="api-server"} => 1 @[%v]`,
				`{job="app-server"} => 2 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) / 0`,
			output: []string{
				`{job="api-server"} => +Inf @[%v]`,
				`{job="app-server"} => +Inf @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) > 1000`,
			output: []string{
				`{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `1000 < SUM(http_requests) BY (job)`,
			output: []string{
				`{job="app-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) <= 1000`,
			output: []string{
				`{job="api-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) != 1000`,
			output: []string{
				`{job="app-server"} => 2600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) == 1000`,
			output: []string{
				`{job="api-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `SUM(http_requests) BY (job) + SUM(http_requests) BY (job)`,
			output: []string{
				`{job="api-server"} => 2000 @[%v]`,
				`{job="app-server"} => 5200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `http_requests{job="api-server", group="canary"}`,
			output: []string{
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		}, {
			expr: `http_requests{job="api-server", group="canary"} + rate(http_requests{job="api-server"}[5m]) * 5 * 60`,
			output: []string{
				`{group="canary", instance="0", job="api-server"} => 330 @[%v]`,
				`{group="canary", instance="1", job="api-server"} => 440 @[%v]`,
			},
			fullRanges:     4,
			intervalRanges: 0,
		}, {
			expr: `rate(http_requests[25m]) * 25 * 60`,
			output: []string{
				`{group="canary", instance="0", job="api-server"} => 150 @[%v]`,
				`{group="canary", instance="0", job="app-server"} => 350 @[%v]`,
				`{group="canary", instance="1", job="api-server"} => 200 @[%v]`,
				`{group="canary", instance="1", job="app-server"} => 400 @[%v]`,
				`{group="production", instance="0", job="api-server"} => 50 @[%v]`,
				`{group="production", instance="0", job="app-server"} => 249.99999999999997 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 100 @[%v]`,
				`{group="production", instance="1", job="app-server"} => 300 @[%v]`,
			},
			fullRanges:     8,
			intervalRanges: 0,
		}, {
			expr: `delta(http_requests[25m], 1)`,
			output: []string{
				`{group="canary", instance="0", job="api-server"} => 150 @[%v]`,
				`{group="canary", instance="0", job="app-server"} => 350 @[%v]`,
				`{group="canary", instance="1", job="api-server"} => 200 @[%v]`,
				`{group="canary", instance="1", job="app-server"} => 400 @[%v]`,
				`{group="production", instance="0", job="api-server"} => 50 @[%v]`,
				`{group="production", instance="0", job="app-server"} => 250 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 100 @[%v]`,
				`{group="production", instance="1", job="app-server"} => 300 @[%v]`,
			},
			fullRanges:     8,
			intervalRanges: 0,
		}, {
			expr: `sort(http_requests)`,
			output: []string{
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `sort_desc(http_requests)`,
			output: []string{
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `topk(3, http_requests)`,
			output: []string{
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `topk(5, http_requests{group="canary",job="app-server"})`,
			output: []string{
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 2,
		}, {
			expr: `bottomk(3, http_requests)`,
			output: []string{
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			expr: `bottomk(5, http_requests{group="canary",job="app-server"})`,
			output: []string{
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
			},
			checkOrder:     true,
			fullRanges:     0,
			intervalRanges: 2,
		}, {
			// Single-letter label names and values.
			expr: `x{y="testvalue"}`,
			output: []string{
				`x{y="testvalue"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 1,
		}, {
			// Lower-cased aggregation operators should work too.
			expr: `sum(http_requests) by (job) + min(http_requests) by (job) + max(http_requests) by (job) + avg(http_requests) by (job)`,
			output: []string{
				`{job="app-server"} => 4550 @[%v]`,
				`{job="api-server"} => 1750 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// Deltas should be adjusted for target interval vs. samples under target interval.
			expr:           `delta(http_requests{group="canary", instance="1", job="app-server"}[18m])`,
			output:         []string{`{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Deltas should perform the same operation when 2nd argument is 0.
			expr:           `delta(http_requests{group="canary", instance="1", job="app-server"}[18m], 0)`,
			output:         []string{`{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Rates should calculate per-second rates.
			expr:           `rate(http_requests{group="canary", instance="1", job="app-server"}[60m])`,
			output:         []string{`{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Deriv should return the same as rate in simple cases.
			expr:           `deriv(http_requests{group="canary", instance="1", job="app-server"}[60m])`,
			output:         []string{`{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Counter resets at in the middle of range are handled correctly by rate().
			expr:           `rate(testcounter_reset_middle[60m])`,
			output:         []string{`{} => 0.03 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Counter resets at end of range are ignored by rate().
			expr:           `rate(testcounter_reset_end[5m])`,
			output:         []string{`{} => 0 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// Deriv should return correct result.
			expr:           `deriv(testcounter_reset_middle[100m])`,
			output:         []string{`{} => 0.010606060606060607 @[%v]`},
			fullRanges:     1,
			intervalRanges: 0,
		}, {
			// count_scalar for a non-empty vector should return scalar element count.
			expr:           `count_scalar(http_requests)`,
			output:         []string{`scalar: 8 @[%v]`},
			fullRanges:     0,
			intervalRanges: 8,
		}, {
			// count_scalar for an empty vector should return scalar 0.
			expr:           `count_scalar(nonexistent)`,
			output:         []string{`scalar: 0 @[%v]`},
			fullRanges:     0,
			intervalRanges: 0,
		}, {
			// Empty expressions shouldn't parse.
			expr:       ``,
			shouldFail: true,
		}, {
			// Interval durations can't be in quotes.
			expr:       `http_requests["1m"]`,
			shouldFail: true,
		}, {
			// Binop arguments need to be scalar or vector.
			expr:       `http_requests - http_requests[1m]`,
			shouldFail: true,
		}, {
			expr: `http_requests{group!="canary"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `http_requests{job=~"server",group!="canary"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		}, {
			expr: `http_requests{job!~"api",group!="canary"}`,
			output: []string{
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		}, {
			expr:           `count_scalar(http_requests{job=~"^server$"})`,
			output:         []string{`scalar: 0 @[%v]`},
			fullRanges:     0,
			intervalRanges: 0,
		}, {
			expr: `http_requests{group="production",job=~"^api"}`,
			output: []string{
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		},
		{
			expr: `abs(-1 * http_requests{group="production",job="api-server"})`,
			output: []string{
				`{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		},
		{
			expr: `avg_over_time(http_requests{group="production",job="api-server"}[1h])`,
			output: []string{
				`{group="production", instance="0", job="api-server"} => 50 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 100 @[%v]`,
			},
			fullRanges:     2,
			intervalRanges: 0,
		},
		{
			expr: `count_over_time(http_requests{group="production",job="api-server"}[1h])`,
			output: []string{
				`{group="production", instance="0", job="api-server"} => 11 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 11 @[%v]`,
			},
			fullRanges:     2,
			intervalRanges: 0,
		},
		{
			expr: `max_over_time(http_requests{group="production",job="api-server"}[1h])`,
			output: []string{
				`{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 200 @[%v]`,
			},
			fullRanges:     2,
			intervalRanges: 0,
		},
		{
			expr: `min_over_time(http_requests{group="production",job="api-server"}[1h])`,
			output: []string{
				`{group="production", instance="0", job="api-server"} => 0 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 0 @[%v]`,
			},
			fullRanges:     2,
			intervalRanges: 0,
		},
		{
			expr: `sum_over_time(http_requests{group="production",job="api-server"}[1h])`,
			output: []string{
				`{group="production", instance="0", job="api-server"} => 550 @[%v]`,
				`{group="production", instance="1", job="api-server"} => 1100 @[%v]`,
			},
			fullRanges:     2,
			intervalRanges: 0,
		},
		{
			expr:           `time()`,
			output:         []string{`scalar: 3000 @[%v]`},
			fullRanges:     0,
			intervalRanges: 0,
		},
		{
			expr: `drop_common_labels(http_requests{group="production",job="api-server"})`,
			output: []string{
				`http_requests{instance="0"} => 100 @[%v]`,
				`http_requests{instance="1"} => 200 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 2,
		},
		{
			expr: `{` + string(clientmodel.MetricNameLabel) + `=~".*"}`,
			output: []string{
				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
				`testcounter_reset_end => 0 @[%v]`,
				`testcounter_reset_middle => 50 @[%v]`,
				`x{y="testvalue"} => 100 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 11,
		},
		{
			expr: `{job=~"server", job!~"api"}`,
			output: []string{
				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		},
		{
			// Test alternative "by"-clause order.
			expr: `sum by (group) (http_requests{job="api-server"})`,
			output: []string{
				`{group="canary"} => 700 @[%v]`,
				`{group="production"} => 300 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		},
		{
			// Test alternative "by"-clause order with "keeping_extra".
			expr: `sum by (group) keeping_extra (http_requests{job="api-server"})`,
			output: []string{
				`{group="canary", job="api-server"} => 700 @[%v]`,
				`{group="production", job="api-server"} => 300 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		},
		{
			// Test both alternative "by"-clause orders in one expression.
			// Public health warning: stick to one form within an expression (or even
			// in an organization), or risk serious user confusion.
			expr: `sum(sum by (group) keeping_extra (http_requests{job="api-server"})) by (job)`,
			output: []string{
				`{job="api-server"} => 1000 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 4,
		},
		{
			expr: `absent(nonexistent)`,
			output: []string{
				`{} => 1 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 0,
		},
		{
			expr: `absent(nonexistent{job="testjob", instance="testinstance", method=~".*"})`,
			output: []string{
				`{instance="testinstance", job="testjob"} => 1 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 0,
		},
		{
			expr: `count_scalar(absent(http_requests))`,
			output: []string{
				`scalar: 0 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		},
		{
			expr: `count_scalar(absent(sum(http_requests)))`,
			output: []string{
				`scalar: 0 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 8,
		},
		{
			expr: `absent(sum(nonexistent{job="testjob", instance="testinstance"}))`,
			output: []string{
				`{} => 1 @[%v]`,
			},
			fullRanges:     0,
			intervalRanges: 0,
		},
	}

	storage, closer := newTestStorage(t)
	defer closer.Close()

	for i, exprTest := range expressionTests {
		expectedLines := annotateWithTime(exprTest.output, testEvalTime)

		testExpr, err := LoadExprFromString(exprTest.expr)

		if err != nil {
			if exprTest.shouldFail {
				continue
			}
			t.Errorf("%d. Error during parsing: %v", i, err)
			t.Errorf("%d. Expression: %v", i, exprTest.expr)
		} else {
			if exprTest.shouldFail {
				t.Errorf("%d. Test should fail, but didn't", i)
			}
			failed := false
			resultStr := ast.EvalToString(testExpr, testEvalTime, ast.Text, storage, stats.NewTimerGroup())
			resultLines := strings.Split(resultStr, "\n")

			if len(exprTest.output) != len(resultLines) {
				t.Errorf("%d. Number of samples in expected and actual output don't match", i)
				failed = true
			}

			if exprTest.checkOrder {
				for j, expectedSample := range expectedLines {
					if resultLines[j] != expectedSample {
						t.Errorf("%d.%d. Expected sample '%v', got '%v'", i, j, resultLines[j], expectedSample)
						failed = true
					}
				}
			} else {
				for j, expectedSample := range expectedLines {
					found := false
					for _, actualSample := range resultLines {
						if actualSample == expectedSample {
							found = true
						}
					}
					if !found {
						t.Errorf("%d.%d. Couldn't find expected sample in output: '%v'", i, j, expectedSample)
						failed = true
					}
				}
			}

			analyzer := ast.NewQueryAnalyzer(storage)
			ast.Walk(analyzer, testExpr)
			if exprTest.fullRanges != len(analyzer.FullRanges) {
				t.Errorf("%d. Count of full ranges didn't match: %v vs %v", i, exprTest.fullRanges, len(analyzer.FullRanges))
				failed = true
			}
			if exprTest.intervalRanges != len(analyzer.IntervalRanges) {
				t.Errorf("%d. Count of interval ranges didn't match: %v vs %v", i, exprTest.intervalRanges, len(analyzer.IntervalRanges))
				failed = true
			}

			if failed {
				t.Errorf("%d. Expression: %v\n%v", i, exprTest.expr, vectorComparisonString(expectedLines, resultLines))
			}
		}
	}
}