prometheus/retrieval/helpers_test.go

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// Copyright 2013 The Prometheus Authors
// 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 retrieval
import (
"time"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
)
type nopAppender struct{}
func (a nopAppender) Append(*model.Sample) {
}
type slowAppender struct{}
func (a slowAppender) Append(*model.Sample) {
time.Sleep(time.Millisecond)
return
}
type collectResultAppender struct {
result model.Samples
}
func (a *collectResultAppender) Append(s *model.Sample) {
for ln, lv := range s.Metric {
if len(lv) == 0 {
delete(s.Metric, ln)
}
}
a.result = append(a.result, s)
}
// fakeTargetProvider implements a TargetProvider and allows manual injection
// of TargetGroups through the update channel.
type fakeTargetProvider struct {
sources []string
update chan *config.TargetGroup
}
func (tp *fakeTargetProvider) Run(ch chan<- *config.TargetGroup, done <-chan struct{}) {
defer close(ch)
for {
select {
case tg := <-tp.update:
ch <- tg
case <-done:
return
}
}
}
func (tp *fakeTargetProvider) Sources() []string {
return tp.sources
}