forked from mirrors/statsd_exporter
144 lines
3.8 KiB
Go
144 lines
3.8 KiB
Go
// Copyright 2013 The Prometheus Authors
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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 main
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import (
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"fmt"
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"io/ioutil"
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"regexp"
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"strings"
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"sync"
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"github.com/prometheus/client_golang/prometheus"
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)
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var (
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identifierRE = `[a-zA-Z_][a-zA-Z0-9_]+`
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statsdMetricRE = `[a-zA-Z_](-?[a-zA-Z0-9_])+`
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metricLineRE = regexp.MustCompile(`^(\*\.|` + statsdMetricRE + `\.)+(\*|` + statsdMetricRE + `)$`)
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labelLineRE = regexp.MustCompile(`^(` + identifierRE + `)\s*=\s*"(.*)"$`)
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metricNameRE = regexp.MustCompile(`^` + identifierRE + `$`)
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)
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type metricMapping struct {
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regex *regexp.Regexp
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labels prometheus.Labels
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}
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type metricMapper struct {
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mappings []metricMapping
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mutex sync.Mutex
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}
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type configLoadStates int
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const (
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SEARCHING configLoadStates = iota
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METRIC_DEFINITION
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)
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func (m *metricMapper) initFromString(fileContents string) error {
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lines := strings.Split(fileContents, "\n")
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state := SEARCHING
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parsedMappings := []metricMapping{}
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currentMapping := metricMapping{labels: prometheus.Labels{}}
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for i, line := range lines {
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line := strings.TrimSpace(line)
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switch state {
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case SEARCHING:
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if line == "" {
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continue
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}
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if !metricLineRE.MatchString(line) {
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return fmt.Errorf("Line %d: expected metric match line, got: %s", i, line)
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}
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// Translate the glob-style metric match line into a proper regex that we
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// can use to match metrics later on.
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metricRe := strings.Replace(line, ".", "\\.", -1)
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metricRe = strings.Replace(metricRe, "*", "([^.]+)", -1)
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currentMapping.regex = regexp.MustCompile("^" + metricRe + "$")
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state = METRIC_DEFINITION
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case METRIC_DEFINITION:
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if line == "" {
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if len(currentMapping.labels) == 0 {
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return fmt.Errorf("Line %d: metric mapping didn't set any labels", i)
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}
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if _, ok := currentMapping.labels["name"]; !ok {
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return fmt.Errorf("Line %d: metric mapping didn't set a metric name", i)
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}
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parsedMappings = append(parsedMappings, currentMapping)
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state = SEARCHING
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currentMapping = metricMapping{labels: prometheus.Labels{}}
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continue
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}
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matches := labelLineRE.FindStringSubmatch(line)
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if len(matches) != 3 {
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return fmt.Errorf("Line %d: expected label mapping line, got: %s", i, line)
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}
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label, value := matches[1], matches[2]
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if label == "name" && !metricNameRE.MatchString(value) {
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return fmt.Errorf("Line %d: metric name '%s' doesn't match regex '%s'", i, value, metricNameRE)
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}
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currentMapping.labels[label] = value
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default:
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panic("illegal state")
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}
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}
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.mappings = parsedMappings
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mappingsCount.Set(float64(len(parsedMappings)))
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return nil
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}
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func (m *metricMapper) initFromFile(fileName string) error {
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mappingStr, err := ioutil.ReadFile(fileName)
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if err != nil {
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return err
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}
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return m.initFromString(string(mappingStr))
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}
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func (m *metricMapper) getMapping(statsdMetric string) (labels prometheus.Labels, present bool) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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for _, mapping := range m.mappings {
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matches := mapping.regex.FindStringSubmatchIndex(statsdMetric)
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if len(matches) == 0 {
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continue
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}
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labels := prometheus.Labels{}
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for label, valueExpr := range mapping.labels {
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value := mapping.regex.ExpandString([]byte{}, valueExpr, statsdMetric, matches)
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labels[label] = string(value)
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}
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return labels, true
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}
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return nil, false
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}
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