statsd_exporter/pkg/mapper/mapper.go

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// Copyright 2013 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 express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mapper
import (
"fmt"
"io/ioutil"
"regexp"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
yaml "gopkg.in/yaml.v2"
"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
)
var (
statsdMetricRE = `[a-zA-Z_](-?[a-zA-Z0-9_])*`
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templateReplaceRE = `(\$\{?\d+\}?)`
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metricLineRE = regexp.MustCompile(`^(\*\.|` + statsdMetricRE + `\.)+(\*|` + statsdMetricRE + `)$`)
metricNameRE = regexp.MustCompile(`^([a-zA-Z_]|` + templateReplaceRE + `)([a-zA-Z0-9_]|` + templateReplaceRE + `)*$`)
labelNameRE = regexp.MustCompile(`^[a-zA-Z_][a-zA-Z0-9_]+$`)
)
type MetricMapper struct {
Registerer prometheus.Registerer
Defaults mapperConfigDefaults `yaml:"defaults"`
Mappings []MetricMapping `yaml:"mappings"`
FSM *fsm.FSM
doFSM bool
doRegex bool
cache MetricMapperCache
mutex sync.RWMutex
MappingsCount prometheus.Gauge
}
type SummaryOptions struct {
Quantiles []metricObjective `yaml:"quantiles"`
MaxAge time.Duration `yaml:"max_age"`
AgeBuckets uint32 `yaml:"age_buckets"`
BufCap uint32 `yaml:"buf_cap"`
}
type HistogramOptions struct {
Buckets []float64 `yaml:"buckets"`
}
type metricObjective struct {
Quantile float64 `yaml:"quantile"`
Error float64 `yaml:"error"`
}
var defaultQuantiles = []metricObjective{
{Quantile: 0.5, Error: 0.05},
{Quantile: 0.9, Error: 0.01},
{Quantile: 0.99, Error: 0.001},
}
func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
var n MetricMapper
if err := yaml.Unmarshal([]byte(fileContents), &n); err != nil {
return err
}
if len(n.Defaults.HistogramOptions.Buckets) == 0 {
n.Defaults.HistogramOptions.Buckets = prometheus.DefBuckets
}
if len(n.Defaults.SummaryOptions.Quantiles) == 0 {
n.Defaults.SummaryOptions.Quantiles = defaultQuantiles
}
if n.Defaults.MatchType == MatchTypeDefault {
n.Defaults.MatchType = MatchTypeGlob
}
remainingMappingsCount := len(n.Mappings)
n.FSM = fsm.NewFSM([]string{string(MetricTypeCounter), string(MetricTypeGauge), string(MetricTypeObserver)},
remainingMappingsCount, n.Defaults.GlobDisableOrdering)
for i := range n.Mappings {
remainingMappingsCount--
currentMapping := &n.Mappings[i]
// check that label is correct
for k := range currentMapping.Labels {
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if !labelNameRE.MatchString(k) {
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return fmt.Errorf("invalid label key: %s", k)
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}
}
if currentMapping.Name == "" {
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return fmt.Errorf("line %d: metric mapping didn't set a metric name", i)
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}
if !metricNameRE.MatchString(currentMapping.Name) {
return fmt.Errorf("metric name '%s' doesn't match regex '%s'", currentMapping.Name, metricNameRE)
}
if currentMapping.MatchType == "" {
currentMapping.MatchType = n.Defaults.MatchType
}
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if currentMapping.Action == "" {
currentMapping.Action = ActionTypeMap
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}
if currentMapping.MatchType == MatchTypeGlob {
n.doFSM = true
if !metricLineRE.MatchString(currentMapping.Match) {
return fmt.Errorf("invalid match: %s", currentMapping.Match)
}
captureCount := n.FSM.AddState(currentMapping.Match, string(currentMapping.MatchMetricType),
remainingMappingsCount, currentMapping)
currentMapping.nameFormatter = fsm.NewTemplateFormatter(currentMapping.Name, captureCount)
labelKeys := make([]string, len(currentMapping.Labels))
labelFormatters := make([]*fsm.TemplateFormatter, len(currentMapping.Labels))
labelIndex := 0
for label, valueExpr := range currentMapping.Labels {
labelKeys[labelIndex] = label
labelFormatters[labelIndex] = fsm.NewTemplateFormatter(valueExpr, captureCount)
labelIndex++
}
currentMapping.labelFormatters = labelFormatters
currentMapping.labelKeys = labelKeys
} else {
if regex, err := regexp.Compile(currentMapping.Match); err != nil {
return fmt.Errorf("invalid regex %s in mapping: %v", currentMapping.Match, err)
} else {
currentMapping.regex = regex
}
n.doRegex = true
}
if currentMapping.ObserverType == "" {
currentMapping.ObserverType = n.Defaults.ObserverType
}
if currentMapping.LegacyQuantiles != nil &&
(currentMapping.SummaryOptions == nil || currentMapping.SummaryOptions.Quantiles != nil) {
log.Warn("using the top level quantiles is deprecated. Please use quantiles in the summary_options hierarchy")
}
if currentMapping.LegacyBuckets != nil &&
(currentMapping.HistogramOptions == nil || currentMapping.HistogramOptions.Buckets != nil) {
log.Warn("using the top level buckets is deprecated. Please use buckets in the histogram_options hierarchy")
}
if currentMapping.SummaryOptions != nil &&
currentMapping.LegacyQuantiles != nil &&
currentMapping.SummaryOptions.Quantiles != nil {
return fmt.Errorf("cannot use quantiles in both the top level and summary options at the same time in %s", currentMapping.Match)
}
if currentMapping.HistogramOptions != nil &&
currentMapping.LegacyBuckets != nil &&
currentMapping.HistogramOptions.Buckets != nil {
return fmt.Errorf("cannot use buckets in both the top level and histogram options at the same time in %s", currentMapping.Match)
}
if currentMapping.ObserverType == ObserverTypeHistogram {
if currentMapping.SummaryOptions != nil {
return fmt.Errorf("cannot use histogram observer and summary options at the same time")
}
if currentMapping.HistogramOptions == nil {
currentMapping.HistogramOptions = &HistogramOptions{}
}
if currentMapping.LegacyBuckets != nil && len(currentMapping.LegacyBuckets) != 0 {
currentMapping.HistogramOptions.Buckets = currentMapping.LegacyBuckets
}
if currentMapping.HistogramOptions.Buckets == nil || len(currentMapping.HistogramOptions.Buckets) == 0 {
currentMapping.HistogramOptions.Buckets = n.Defaults.HistogramOptions.Buckets
}
}
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if currentMapping.ObserverType == ObserverTypeSummary {
if currentMapping.HistogramOptions != nil {
return fmt.Errorf("cannot use summary observer and histogram options at the same time")
}
if currentMapping.SummaryOptions == nil {
currentMapping.SummaryOptions = &SummaryOptions{}
}
if currentMapping.LegacyQuantiles != nil && len(currentMapping.LegacyQuantiles) != 0 {
currentMapping.SummaryOptions.Quantiles = currentMapping.LegacyQuantiles
}
if currentMapping.SummaryOptions.Quantiles == nil || len(currentMapping.SummaryOptions.Quantiles) == 0 {
currentMapping.SummaryOptions.Quantiles = n.Defaults.SummaryOptions.Quantiles
}
if currentMapping.SummaryOptions.MaxAge == 0 {
currentMapping.SummaryOptions.MaxAge = n.Defaults.SummaryOptions.MaxAge
}
if currentMapping.SummaryOptions.AgeBuckets == 0 {
currentMapping.SummaryOptions.AgeBuckets = n.Defaults.SummaryOptions.AgeBuckets
}
if currentMapping.SummaryOptions.BufCap == 0 {
currentMapping.SummaryOptions.BufCap = n.Defaults.SummaryOptions.BufCap
}
}
if currentMapping.Ttl == 0 && n.Defaults.Ttl > 0 {
currentMapping.Ttl = n.Defaults.Ttl
}
}
m.mutex.Lock()
defer m.mutex.Unlock()
m.Defaults = n.Defaults
m.Mappings = n.Mappings
// If no cache has been configured, use a noop cache
if m.cache == nil {
m.cache = NewMetricMapperNoopCache()
}
// Reset the cache since this function can be used to reload config
m.cache.Reset()
if n.doFSM {
var mappings []string
for _, mapping := range n.Mappings {
if mapping.MatchType == MatchTypeGlob {
mappings = append(mappings, mapping.Match)
}
}
n.FSM.BacktrackingNeeded = fsm.TestIfNeedBacktracking(mappings, n.FSM.OrderingDisabled)
m.FSM = n.FSM
m.doRegex = n.doRegex
}
m.doFSM = n.doFSM
if m.MappingsCount != nil {
m.MappingsCount.Set(float64(len(n.Mappings)))
}
return nil
}
func (m *MetricMapper) InitFromFile(fileName string) error {
mappingStr, err := ioutil.ReadFile(fileName)
if err != nil {
return err
}
return m.InitFromYAMLString(string(mappingStr))
}
func (m *MetricMapper) UseCache(cache MetricMapperCache) {
m.cache = cache
}
func (m *MetricMapper) GetMapping(statsdMetric string, statsdMetricType MetricType) (*MetricMapping, prometheus.Labels, bool) {
m.mutex.RLock()
defer m.mutex.RUnlock()
// default cache to noop cache if used from an uninitialized mapper
if m.cache == nil {
m.cache = NewMetricMapperNoopCache()
}
result, cached := m.cache.Get(formatKey(statsdMetric, statsdMetricType))
if cached {
r := result.(MetricMapperCacheResult)
return r.Mapping, r.Labels, r.Matched
}
// glob matching
if m.doFSM {
finalState, captures := m.FSM.GetMapping(statsdMetric, string(statsdMetricType))
if finalState != nil && finalState.Result != nil {
v := finalState.Result.(*MetricMapping)
result := copyMetricMapping(v)
result.Name = result.nameFormatter.Format(captures)
labels := prometheus.Labels{}
for index, formatter := range result.labelFormatters {
labels[result.labelKeys[index]] = formatter.Format(captures)
}
r := MetricMapperCacheResult{
Mapping: result,
Matched: true,
Labels: labels,
}
// add match to cache
m.cache.Add(formatKey(statsdMetric, statsdMetricType), r)
return result, labels, true
} else if !m.doRegex {
// if there's no regex match type, return immediately
// Add miss cache
m.cache.Add(formatKey(statsdMetric, statsdMetricType), MetricMapperCacheResult{})
return nil, nil, false
}
}
// regex matching
for _, mapping := range m.Mappings {
// if a rule don't have regex matching type, the regex field is unset
if mapping.regex == nil {
continue
}
matches := mapping.regex.FindStringSubmatchIndex(statsdMetric)
if len(matches) == 0 {
continue
}
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mapping.Name = string(mapping.regex.ExpandString(
[]byte{},
mapping.Name,
statsdMetric,
matches,
))
if mt := mapping.MatchMetricType; mt != "" && mt != statsdMetricType {
continue
}
labels := prometheus.Labels{}
for label, valueExpr := range mapping.Labels {
value := mapping.regex.ExpandString([]byte{}, valueExpr, statsdMetric, matches)
labels[label] = string(value)
}
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r := MetricMapperCacheResult{
Mapping: &mapping,
Matched: true,
Labels: labels,
}
// Add Match to cache
m.cache.Add(formatKey(statsdMetric, statsdMetricType), r)
return &mapping, labels, true
}
// Add Miss to cache
m.cache.Add(formatKey(statsdMetric, statsdMetricType), MetricMapperCacheResult{})
return nil, nil, false
}
// make a shallow copy so that we do not overwrite name
// as multiple names can be matched by same mapping
func copyMetricMapping(in *MetricMapping) *MetricMapping {
var out MetricMapping
out = *in
return &out
}