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11b3c2387c
- Increase samplesQueueCapacity. - Improve docstring for the above. - Accept a short waiting period for the ingest channel to become ready. This should depend on the http timeout, but 100ms is probably good enough to cushion bursts bigger than samplesQueueCapacity, while it is unlikely that anybody ever will set an HTTP timeout similarly short.
72 lines
2.3 KiB
Go
72 lines
2.3 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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"errors"
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"time"
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"github.com/prometheus/client_golang/extraction"
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clientmodel "github.com/prometheus/client_golang/model"
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)
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const ingestTimeout = 100 * time.Millisecond // TODO(beorn7): Adjust this to a fraction of the actual HTTP timeout.
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var errIngestChannelFull = errors.New("ingestion channel full")
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// MergeLabelsIngester merges a labelset ontop of a given extraction result and
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// passes the result on to another ingester. Label collisions are avoided by
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// appending a label prefix to any newly merged colliding labels.
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type MergeLabelsIngester struct {
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Labels clientmodel.LabelSet
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CollisionPrefix clientmodel.LabelName
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Ingester extraction.Ingester
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}
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// Ingest ingests the provided extraction result by merging in i.Labels and then
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// handing it over to i.Ingester.
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func (i *MergeLabelsIngester) Ingest(samples clientmodel.Samples) error {
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for _, s := range samples {
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s.Metric.MergeFromLabelSet(i.Labels, i.CollisionPrefix)
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}
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return i.Ingester.Ingest(samples)
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}
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// ChannelIngester feeds results into a channel without modifying them.
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type ChannelIngester chan<- clientmodel.Samples
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// Ingest ingests the provided extraction result by sending it to its channel.
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// If the channel was not able to receive the samples within the ingestTimeout,
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// an error is returned. This is important to fail fast and to not pile up
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// ingestion requests in case of overload.
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func (i ChannelIngester) Ingest(s clientmodel.Samples) error {
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// Since the regular case is that i is ready to receive, first try
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// without setting a timeout so that we don't need to allocate a timer
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// most of the time.
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select {
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case i <- s:
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return nil
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default:
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select {
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case i <- s:
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return nil
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case <-time.After(ingestTimeout):
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return errIngestChannelFull
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}
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}
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}
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