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PromQL: Fix string and parentheses handling in engine (#6612)

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* WIP: PromQL: Allow engine to return strings

Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Add test suggested by @roidelapluie

Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Fix typo in React UI

Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Fix parenthesis handling for functions and aggregator params

Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Add more tests

Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Fix React UI test

Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>
This commit is contained in:
Tobias Guggenmos 2020-01-15 18:31:58 +01:00 committed by Julius Volz
parent ee03dbe011
commit 3a204be6b7
8 changed files with 97 additions and 6 deletions
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30
promql/engine.go
View file

@ -535,6 +535,7 @@ func (ng *Engine) execEvalStmt(ctx context.Context, query *query, s *EvalStmt) (
defaultEvalInterval: GetDefaultEvaluationInterval(),
logger: ng.logger,
}
val, err := evaluator.Eval(s.Expr)
if err != nil {
return nil, warnings, err
@ -542,10 +543,17 @@ func (ng *Engine) execEvalStmt(ctx context.Context, query *query, s *EvalStmt) (
evalSpanTimer.Finish()
mat, ok := val.(Matrix)
if !ok {
var mat Matrix
switch result := val.(type) {
case Matrix:
mat = result
case String:
return result, warnings, nil
default:
panic(errors.Errorf("promql.Engine.exec: invalid expression type %q", val.Type()))
}
query.matrix = mat
switch s.Expr.Type() {
case ValueTypeVector:
@ -1020,6 +1028,7 @@ func (ev *evaluator) eval(expr Expr) Value {
switch e := expr.(type) {
case *AggregateExpr:
unwrapParenExpr(&e.Param)
if s, ok := e.Param.(*StringLiteral); ok {
return ev.rangeEval(func(v []Value, enh *EvalNodeHelper) Vector {
return ev.aggregation(e.Op, e.Grouping, e.Without, s.Val, v[0].(Vector), enh)
@ -1049,7 +1058,9 @@ func (ev *evaluator) eval(expr Expr) Value {
// Check if the function has a matrix argument.
var matrixArgIndex int
var matrixArg bool
for i, a := range e.Args {
for i := range e.Args {
unwrapParenExpr(&e.Args[i])
a := e.Args[i]
if _, ok := a.(*MatrixSelector); ok {
matrixArgIndex = i
matrixArg = true
@ -1324,6 +1335,8 @@ func (ev *evaluator) eval(expr Expr) Value {
res := newEv.eval(e.Expr)
ev.currentSamples = newEv.currentSamples
return res
case *StringLiteral:
return String{V: e.Val, T: ev.startTimestamp}
}
panic(errors.Errorf("unhandled expression of type: %T", expr))
@ -2100,3 +2113,14 @@ func documentedType(t ValueType) string {
func formatDate(t time.Time) string {
return t.UTC().Format("2006-01-02T15:04:05.000Z07:00")
}
// unwrapParenExpr does the AST equivalent of removing parentheses around a expression.
func unwrapParenExpr(e *Expr) {
for {
if p, ok := (*e).(*ParenExpr); ok {
*e = p.Expr
} else {
break
}
}
}

22
promql/testdata/aggregators.test vendored
View file

@ -17,6 +17,10 @@ eval instant at 50m SUM BY (group) (http_requests{job="api-server"})
{group="canary"} 700
{group="production"} 300
eval instant at 50m SUM BY (group) (((http_requests{job="api-server"})))
{group="canary"} 700
{group="production"} 300
# Test alternative "by"-clause order.
eval instant at 50m sum by (group) (http_requests{job="api-server"})
{group="canary"} 700
@ -160,6 +164,11 @@ eval_ordered instant at 50m topk(3, http_requests)
http_requests{group="canary", instance="0", job="app-server"} 700
http_requests{group="production", instance="1", job="app-server"} 600
eval_ordered instant at 50m topk((3), (http_requests))
http_requests{group="canary", instance="1", job="app-server"} 800
http_requests{group="canary", instance="0", job="app-server"} 700
http_requests{group="production", instance="1", job="app-server"} 600
eval_ordered instant at 50m topk(5, http_requests{group="canary",job="app-server"})
http_requests{group="canary", instance="1", job="app-server"} 800
http_requests{group="canary", instance="0", job="app-server"} 700
@ -233,6 +242,13 @@ eval instant at 5m count_values("version", version)
{version="7"} 2
{version="8"} 2
eval instant at 5m count_values(((("version"))), version)
{version="6"} 5
{version="7"} 2
{version="8"} 2
eval instant at 5m count_values without (instance)("version", version)
{job="api-server", group="production", version="6"} 3
{job="api-server", group="canary", version="8"} 2
@ -276,3 +292,9 @@ eval instant at 1m quantile without(point)(scalar(foo), data)
{test="two samples"} 0.8
{test="three samples"} 1.6
{test="uneven samples"} 2.8
eval instant at 1m quantile without(point)((scalar(foo)), data)
{test="two samples"} 0.8
{test="three samples"} 1.6
{test="uneven samples"} 2.8

25
promql/testdata/functions.test vendored
View file

@ -48,6 +48,11 @@ eval instant at 50m changes(http_requests[50m])
{path="/bar"} 9
{path="/biz"} 1
eval instant at 50m changes((http_requests[50m]))
{path="/foo"} 8
{path="/bar"} 9
{path="/biz"} 1
eval instant at 50m changes(nonexistent_metric[50m])
clear
@ -207,6 +212,10 @@ eval instant at 0m label_replace(testmetric, "dst", "value-$1", "src", "non-matc
testmetric{src="source-value-10",dst="original-destination-value"} 0
testmetric{src="source-value-20",dst="original-destination-value"} 1
eval instant at 0m label_replace((((testmetric))), (("dst")), (("value-$1")), (("src")), (("non-matching-regex")))
testmetric{src="source-value-10",dst="original-destination-value"} 0
testmetric{src="source-value-20",dst="original-destination-value"} 1
# label_replace drops labels that are set to empty values.
eval instant at 0m label_replace(testmetric, "dst", "", "dst", ".*")
testmetric{src="source-value-10"} 0
@ -236,6 +245,9 @@ eval instant at 5s timestamp(metric)
eval instant at 10s timestamp(metric)
{} 10
eval instant at 10s timestamp(((metric)))
{} 10
# Tests for label_join.
load 5m
testmetric{src="a",src1="b",src2="c",dst="original-destination-value"} 0
@ -308,6 +320,11 @@ eval instant at 0m clamp_max(clamp_min(test_clamp, -20), 70)
{src="clamp-b"} 0
{src="clamp-c"} 70
eval instant at 0m clamp_max((clamp_min(test_clamp, (-20))), (70))
{src="clamp-a"} -20
{src="clamp-b"} 0
{src="clamp-c"} 70
# Tests for sort/sort_desc.
clear
@ -393,6 +410,9 @@ eval instant at 1m stdvar_over_time(metric[1m])
eval instant at 1m stddev_over_time(metric[1m])
{} 3.249615
eval instant at 1m stddev_over_time((metric[1m]))
{} 3.249615
# Tests for stddev_over_time and stdvar_over_time #4927.
clear
load 10s
@ -447,6 +467,11 @@ eval instant at 1m quantile_over_time(2, data[1m])
{test="three samples"} +Inf
{test="uneven samples"} +Inf
eval instant at 1m (quantile_over_time(2, (data[1m])))
{test="two samples"} +Inf
{test="three samples"} +Inf
{test="uneven samples"} +Inf
clear
# Test time-related functions.

3
promql/testdata/literals.test vendored
View file

@ -46,6 +46,9 @@ eval instant at 50m 2.
eval instant at 50m 1 / 0
+Inf
eval instant at 50m ((1) / (0))
+Inf
eval instant at 50m -1 / 0
-Inf

13
promql/testdata/operators.test vendored
View file

@ -93,6 +93,9 @@ eval instant at 50m SUM(http_requests) BY (job) + SUM(http_requests) BY (job)
{job="api-server"} 2000
{job="app-server"} 5200
eval instant at 50m (SUM((http_requests)) BY (job)) + SUM(http_requests) BY (job)
{job="api-server"} 2000
{job="app-server"} 5200
eval instant at 50m http_requests{job="api-server", group="canary"}
http_requests{group="canary", instance="0", job="api-server"} 300
@ -112,6 +115,16 @@ eval instant at 50m rate(http_requests[25m]) * 25 * 60
{group="production", instance="1", job="api-server"} 100
{group="production", instance="1", job="app-server"} 300
eval instant at 50m (rate((http_requests[25m])) * 25) * 60
{group="canary", instance="0", job="api-server"} 150
{group="canary", instance="0", job="app-server"} 350
{group="canary", instance="1", job="api-server"} 200
{group="canary", instance="1", job="app-server"} 400
{group="production", instance="0", job="api-server"} 50
{group="production", instance="0", job="app-server"} 249.99999999999997
{group="production", instance="1", job="api-server"} 100
{group="production", instance="1", job="app-server"} 300
eval instant at 50m http_requests{group="canary"} and http_requests{instance="0"}
http_requests{group="canary", instance="0", job="api-server"} 300

6
promql/testdata/subquery.test vendored
View file

@ -73,6 +73,9 @@ eval instant at 1010s sum_over_time(metric1[30s:10s] offset 5s)
eval instant at 1010s sum_over_time(metric1[30s:10s] offset 3s)
{} 297
eval instant at 1010s sum_over_time((metric1)[30s:10s] offset 3s)
{} 297
# Nested subqueries
eval instant at 1000s rate(sum_over_time(metric1[30s:10s])[50s:10s])
{} 0.4
@ -110,4 +113,5 @@ eval instant at 20s min_over_time(metric[10s:10s])
{} 1
eval instant at 20m min_over_time(rate(metric[5m])[20m:1m])
{} 0.12119047619047618
{} 0.12119047619047618

2
web/ui/react-app/src/pages/graph/DataTable.test.tsx
View file

@ -261,7 +261,7 @@ describe('DataTable', () => {
it('renders a string row', () => {
const table = dataTable.find(Table);
const rows = table.find('tr');
expect(rows.text()).toEqual('scalart');
expect(rows.text()).toEqual('stringt');
});
});
});

2
web/ui/react-app/src/pages/graph/DataTable.tsx
View file

@ -103,7 +103,7 @@ const DataTable: FC<QueryResult> = ({ data }) => {
case 'string':
rows.push(
<tr key="0">
<td>scalar</td>
<td>string</td>
<td>{data.result[1]}</td>
</tr>
);