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ec08c9a391
This gives up on the idea to communicate throuh the Append() call (by either not returning as it is now or returning an error as suggested/explored elsewhere). Here I have added a Throttled() call, which has the advantage that it can be called before a whole _batch_ of Append()'s. Scrapes will happen completely or not at all. Same for rule group evaluations. That's a highly desired behavior (as discussed elsewhere). The code is even simpler now as the whole ingestion buffer could be removed. Logging of throttled mode has been streamlined and will create at most one message per minute.
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package retrieval
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import (
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/config"
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)
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type nopAppender struct{}
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func (a nopAppender) Append(*model.Sample) {
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}
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func (a nopAppender) NeedsThrottling() bool {
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return false
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}
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type collectResultAppender struct {
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result model.Samples
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throttled bool
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}
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func (a *collectResultAppender) Append(s *model.Sample) {
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for ln, lv := range s.Metric {
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if len(lv) == 0 {
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delete(s.Metric, ln)
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}
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}
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a.result = append(a.result, s)
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}
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func (a *collectResultAppender) NeedsThrottling() bool {
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return a.throttled
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}
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// fakeTargetProvider implements a TargetProvider and allows manual injection
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// of TargetGroups through the update channel.
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type fakeTargetProvider struct {
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sources []string
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update chan *config.TargetGroup
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}
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func (tp *fakeTargetProvider) Run(ch chan<- config.TargetGroup, done <-chan struct{}) {
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defer close(ch)
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for {
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select {
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case tg := <-tp.update:
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ch <- *tg
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case <-done:
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return
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}
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}
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}
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func (tp *fakeTargetProvider) Sources() []string {
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return tp.sources
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}
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