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8f4c7ece92
The use of naked return values is frowned upon. This is the first of two bulk updates to remove them.
78 lines
2.2 KiB
Go
78 lines
2.2 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 rules
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import (
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"fmt"
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"github.com/prometheus/prometheus/model"
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"github.com/prometheus/prometheus/rules/ast"
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"github.com/prometheus/prometheus/storage/metric"
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"time"
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)
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// A RecordingRule records its vector expression into new timeseries.
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type RecordingRule struct {
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name string
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vector ast.VectorNode
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labels model.LabelSet
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permanent bool
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}
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func (rule RecordingRule) Name() string { return rule.name }
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func (rule RecordingRule) EvalRaw(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error) {
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return ast.EvalVectorInstant(rule.vector, timestamp, storage)
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}
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func (rule RecordingRule) Eval(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error) {
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// Get the raw value of the rule expression.
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vector, err := rule.EvalRaw(timestamp, storage)
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if err != nil {
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return nil, err
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}
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// Override the metric name and labels.
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for _, sample := range vector {
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sample.Metric[model.MetricNameLabel] = model.LabelValue(rule.name)
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for label, value := range rule.labels {
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if value == "" {
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delete(sample.Metric, label)
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} else {
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sample.Metric[label] = value
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}
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}
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}
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return vector, nil
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}
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func (rule RecordingRule) ToDotGraph() string {
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graph := fmt.Sprintf(`digraph "Rules" {
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%#p[shape="box",label="%s = "];
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%#p -> %#p;
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%s
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}`, &rule, rule.name, &rule, rule.vector, rule.vector.NodeTreeToDotGraph())
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return graph
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}
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// Construct a new RecordingRule.
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func NewRecordingRule(name string, labels model.LabelSet, vector ast.VectorNode, permanent bool) *RecordingRule {
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return &RecordingRule{
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name: name,
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labels: labels,
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vector: vector,
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permanent: permanent,
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}
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}
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