mirror of
https://github.com/prometheus/prometheus.git
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114 lines
3 KiB
Go
114 lines
3 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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"encoding/json"
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"fmt"
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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 for telemetry schema version 0.0.2.
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var Processor002 ProcessorFunc = func(stream io.ReadCloser, timestamp time.Time, baseLabels model.LabelSet, results chan Result) error {
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// container for telemetry data
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var entities []struct {
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BaseLabels map[string]string `json:"baseLabels"`
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Docstring string `json:"docstring"`
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Metric struct {
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Type string `json:"type"`
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Values json.RawMessage `json:"value"`
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} `json:"metric"`
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}
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// concrete type for histogram values
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type histogram struct {
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Labels map[string]string `json:"labels"`
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Values map[string]model.SampleValue `json:"value"`
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}
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// concrete type for counter and gauge values
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type counter struct {
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Labels map[string]string `json:"labels"`
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Value model.SampleValue `json:"value"`
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}
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defer stream.Close()
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if err := json.NewDecoder(stream).Decode(&entities); err != nil {
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return err
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}
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for _, entity := range entities {
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entityLabels := baseLabels.Merge(LabelSet(entity.BaseLabels))
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switch entity.Metric.Type {
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case "counter", "gauge":
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var values []counter
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if err := json.Unmarshal(entity.Metric.Values, &values); err != nil {
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results <- Result{
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Err: fmt.Errorf("Could not extract %s value: %s", entity.Metric.Type, err),
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}
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continue
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}
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for _, counter := range values {
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labels := entityLabels.Merge(LabelSet(counter.Labels))
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results <- Result{
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Sample: model.Sample{
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Metric: model.Metric(labels),
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Timestamp: timestamp,
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Value: counter.Value,
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},
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}
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}
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case "histogram":
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var values []histogram
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if err := json.Unmarshal(entity.Metric.Values, &values); err != nil {
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results <- Result{
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Err: fmt.Errorf("Could not extract %s value: %s", entity.Metric.Type, err),
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}
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continue
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}
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for _, histogram := range values {
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for percentile, value := range histogram.Values {
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labels := entityLabels.Merge(LabelSet(histogram.Labels))
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labels[model.LabelName("percentile")] = model.LabelValue(percentile)
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results <- Result{
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Sample: model.Sample{
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Metric: model.Metric(labels),
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Timestamp: timestamp,
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Value: value,
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},
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}
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}
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}
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default:
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results <- Result{
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Err: fmt.Errorf("Unknown metric type %q", entity.Metric.Type),
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}
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}
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}
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return nil
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}
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