prometheus/rules/ast/functions_test.go
Julius Volz c9618d11e8 Introduce copy-on-write for metrics in AST.
This depends on changes in:

https://github.com/prometheus/client_golang/tree/cow-metrics.

Change-Id: I80b94833a60ddf954c7cd92fd2cfbebd8dd46142
2014-12-12 20:34:55 +01:00

64 lines
2 KiB
Go

// Copyright 2013 Prometheus Team
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ast
import (
"testing"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/storage/metric"
)
type emptyRangeNode struct{}
func (node emptyRangeNode) Type() ExprType { return MATRIX }
func (node emptyRangeNode) NodeTreeToDotGraph() string { return "" }
func (node emptyRangeNode) String() string { return "" }
func (node emptyRangeNode) Children() Nodes { return Nodes{} }
func (node emptyRangeNode) Eval(timestamp clientmodel.Timestamp) Matrix {
return Matrix{
SampleStream{
Metric: clientmodel.COWMetric{
Metric: clientmodel.Metric{clientmodel.MetricNameLabel: "empty_metric"},
},
Values: metric.Values{},
},
}
}
func (node emptyRangeNode) EvalBoundaries(timestamp clientmodel.Timestamp) Matrix {
return Matrix{
SampleStream{
Metric: clientmodel.COWMetric{
Metric: clientmodel.Metric{clientmodel.MetricNameLabel: "empty_metric"},
},
Values: metric.Values{},
},
}
}
func TestDeltaWithEmptyElementDoesNotCrash(t *testing.T) {
now := clientmodel.Now()
vector := deltaImpl(now, []Node{emptyRangeNode{}, &ScalarLiteral{value: 0}}).(Vector)
if len(vector) != 0 {
t.Fatalf("Expected empty result vector, got: %v", vector)
}
vector = deltaImpl(now, []Node{emptyRangeNode{}, &ScalarLiteral{value: 1}}).(Vector)
if len(vector) != 0 {
t.Fatalf("Expected empty result vector, got: %v", vector)
}
}