/
mapping.go
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/
mapping.go
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// Copyright 2020 The Prometheus Authors
// 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 xpress or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mapper
import (
"regexp"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
)
type MetricMapping struct {
Match string `yaml:"match"`
Name string `yaml:"name"`
nameFormatter *fsm.TemplateFormatter
regex *regexp.Regexp
Labels prometheus.Labels `yaml:"labels"`
HonorLabels bool `yaml:"honor_labels"`
labelKeys []string
labelFormatters []*fsm.TemplateFormatter
ObserverType ObserverType `yaml:"observer_type"`
TimerType ObserverType `yaml:"timer_type,omitempty"` // DEPRECATED - field only present to preserve backwards compatibility in configs. Always empty
LegacyBuckets []float64 `yaml:"buckets"`
LegacyQuantiles []MetricObjective `yaml:"quantiles"`
MatchType MatchType `yaml:"match_type"`
HelpText string `yaml:"help"`
Action ActionType `yaml:"action"`
MatchMetricType MetricType `yaml:"match_metric_type"`
Ttl time.Duration `yaml:"ttl"`
SummaryOptions *SummaryOptions `yaml:"summary_options"`
HistogramOptions *HistogramOptions `yaml:"histogram_options"`
Scale MaybeFloat64 `yaml:"scale"`
}
// UnmarshalYAML is a custom unmarshal function to allow use of deprecated config keys
// observer_type will override timer_type
func (m *MetricMapping) UnmarshalYAML(unmarshal func(interface{}) error) error {
type MetricMappingAlias MetricMapping
var tmp MetricMappingAlias
if err := unmarshal(&tmp); err != nil {
return err
}
// Copy defaults
m.Match = tmp.Match
m.Name = tmp.Name
m.Labels = tmp.Labels
m.HonorLabels = tmp.HonorLabels
m.ObserverType = tmp.ObserverType
m.LegacyBuckets = tmp.LegacyBuckets
m.LegacyQuantiles = tmp.LegacyQuantiles
m.MatchType = tmp.MatchType
m.HelpText = tmp.HelpText
m.Action = tmp.Action
m.MatchMetricType = tmp.MatchMetricType
m.Ttl = tmp.Ttl
m.SummaryOptions = tmp.SummaryOptions
m.HistogramOptions = tmp.HistogramOptions
m.Scale = tmp.Scale
// Use deprecated TimerType if necessary
if tmp.ObserverType == "" {
m.ObserverType = tmp.TimerType
}
return nil
}
type MaybeFloat64 struct {
Set bool
Val float64
}
func (m *MaybeFloat64) MarshalYAML() (interface{}, error) {
if m.Set {
return m.Val, nil
}
return nil, nil
}
func (m *MaybeFloat64) UnmarshalYAML(unmarshal func(interface{}) error) error {
var tmp float64
if err := unmarshal(&tmp); err != nil {
return err
}
m.Val = tmp
m.Set = true
return nil
}