prometheus/retrieval/ingester.go

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// 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 retrieval
import (
"github.com/prometheus/client_golang/extraction"
clientmodel "github.com/prometheus/client_golang/model"
)
// MergeLabelsIngester merges a labelset ontop of a given extraction result and
// passes the result on to another ingester. Label collisions are avoided by
// appending a label prefix to any newly merged colliding labels.
type MergeLabelsIngester struct {
Labels clientmodel.LabelSet
CollisionPrefix clientmodel.LabelName
Ingester extraction.Ingester
}
// Ingest ingests the provided extraction result by merging in i.Labels and then
// handing it over to i.Ingester.
func (i *MergeLabelsIngester) Ingest(r *extraction.Result) error {
for _, s := range r.Samples {
s.Metric.MergeFromLabelSet(i.Labels, i.CollisionPrefix)
}
return i.Ingester.Ingest(r)
}
// ChannelIngester feeds results into a channel without modifying them.
type ChannelIngester chan<- *extraction.Result
// Ingest ingests the provided extraction result by sending it to i.
func (i ChannelIngester) Ingest(r *extraction.Result) error {
i <- r
return nil
}