71 lines
2.5 KiB
Go
71 lines
2.5 KiB
Go
// Copyright 2013 Prometheus Team
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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 format
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import (
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"github.com/prometheus/prometheus/model"
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"io"
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"time"
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)
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// Processor is responsible for decoding the actual message responses from
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// stream into a format that can be consumed with the end result written
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// to the results channel.
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type Processor interface {
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// Process performs the work on the input and closes the incoming stream.
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Process(stream io.ReadCloser, timestamp time.Time, baseLabels model.LabelSet, results chan Result) (err error)
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}
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// The ProcessorFunc type allows the use of ordinary functions for processors.
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type ProcessorFunc func(io.ReadCloser, time.Time, model.LabelSet, chan Result) error
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func (f ProcessorFunc) Process(stream io.ReadCloser, timestamp time.Time, baseLabels model.LabelSet, results chan Result) error {
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return f(stream, timestamp, baseLabels, results)
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}
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// Helper function to convert map[string]string into model.LabelSet.
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//
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// NOTE: This should be deleted when support for go 1.0.3 is removed; 1.1 is
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// smart enough to unmarshal JSON objects into model.LabelSet directly.
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func LabelSet(labels map[string]string) model.LabelSet {
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labelset := make(model.LabelSet, len(labels))
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for k, v := range labels {
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labelset[model.LabelName(k)] = model.LabelValue(v)
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}
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return labelset
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}
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// Helper function to merge a target's base labels ontop of the labels of an
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// exported sample. If a label is already defined in the exported sample, we
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// assume that we are scraping an intermediate exporter and attach
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// "exporter_"-prefixes to Prometheus' own base labels.
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func mergeTargetLabels(entityLabels, targetLabels model.LabelSet) model.LabelSet {
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result := model.LabelSet{}
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for label, value := range entityLabels {
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result[label] = value
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}
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for label, labelValue := range targetLabels {
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if _, exists := result[label]; exists {
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result[model.ExporterLabelPrefix+label] = labelValue
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} else {
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result[label] = labelValue
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}
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}
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return result
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}
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