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Add YAML config file and ability to set histograms

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This commit is contained in:
Brian Akins 2017-03-12 21:11:05 -04:00
parent df926ae85a
commit 3048412df6
2 changed files with 137 additions and 35 deletions
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47
exporter.go
View file

@ -141,6 +141,36 @@ func (c *SummaryContainer) Get(metricName string, labels prometheus.Labels) prom
return summary
}
type HistogramContainer struct {
Elements map[uint64]prometheus.Histogram
}
func NewHistogramContainer() *HistogramContainer {
return &HistogramContainer{
Elements: make(map[uint64]prometheus.Histogram),
}
}
func (c *HistogramContainer) Get(metricName string, labels prometheus.Labels, mapping *metricMapping) prometheus.Histogram {
hash := hashNameAndLabels(metricName, labels)
histogram, ok := c.Elements[hash]
if !ok {
// TODO: buckets
histogram = prometheus.NewHistogram(
prometheus.HistogramOpts{
Name: metricName,
Help: defaultHelp,
ConstLabels: labels,
Buckets: mapping.Buckets,
})
c.Elements[hash] = histogram
if err := prometheus.Register(histogram); err != nil {
log.Fatalf(regErrF, metricName, err)
}
}
return histogram
}
type Event interface {
MetricName() string
Value() float64
@ -184,6 +214,7 @@ type Exporter struct {
Counters *CounterContainer
Gauges *GaugeContainer
Summaries *SummaryContainer
Histograms *HistogramContainer
mapper *metricMapper
addSuffix bool
}
@ -218,7 +249,7 @@ func (b *Exporter) Listen(e <-chan Events) {
metricName := ""
prometheusLabels := event.Labels()
labels, present := b.mapper.getMapping(event.MetricName())
mapping, labels, present := b.mapper.getMapping(event.MetricName())
if present {
metricName = labels["name"]
for label, value := range labels {
@ -263,12 +294,20 @@ func (b *Exporter) Listen(e <-chan Events) {
eventStats.WithLabelValues("gauge").Inc()
case *TimerEvent:
if mapping.TimerType == "histogram" {
histogram := b.Histograms.Get(
b.suffix(metricName, "timer"),
prometheusLabels,
mapping,
)
histogram.Observe(event.Value())
} else {
summary := b.Summaries.Get(
b.suffix(metricName, "timer"),
prometheusLabels,
)
summary.Observe(event.Value())
}
eventStats.WithLabelValues("timer").Inc()
default:
@ -285,6 +324,7 @@ func NewExporter(mapper *metricMapper, addSuffix bool) *Exporter {
Counters: NewCounterContainer(),
Gauges: NewGaugeContainer(),
Summaries: NewSummaryContainer(),
Histograms: NewHistogramContainer(),
mapper: mapper,
}
}
@ -373,7 +413,8 @@ func (l *StatsDListener) handlePacket(packet []byte, e chan<- Events) {
} else {
samples = strings.Split(elements[1], ":")
}
samples: for _, sample := range samples {
samples:
for _, sample := range samples {
components := strings.Split(sample, "|")
samplingFactor := 1.0
if len(components) < 2 || len(components) > 4 {

93
mapper.go
View file

@ -16,11 +16,13 @@ package main
import (
"fmt"
"io/ioutil"
"path/filepath"
"regexp"
"strings"
"sync"
"github.com/prometheus/client_golang/prometheus"
yaml "gopkg.in/yaml.v2"
)
var (
@ -32,16 +34,25 @@ var (
metricNameRE = regexp.MustCompile(`^` + identifierRE + `$`)
)
type metricMapping struct {
regex *regexp.Regexp
labels prometheus.Labels
type mapperConfigDefaults struct {
TimerType string `yaml:"timer_type"`
Buckets []float64 `yaml:"buckets"`
}
type metricMapper struct {
mappings []metricMapping
Defaults mapperConfigDefaults `yaml:"defaults"`
Mappings []metricMapping `yaml:"mappings"`
mutex sync.Mutex
}
type metricMapping struct {
Match string `yaml:"match"`
regex *regexp.Regexp
Labels prometheus.Labels
TimerType string `yaml:"timer_type"`
Buckets []float64 `yaml:"buckets"`
}
type configLoadStates int
const (
@ -55,9 +66,9 @@ func (m *metricMapper) initFromString(fileContents string) error {
state := SEARCHING
parsedMappings := []metricMapping{}
currentMapping := metricMapping{labels: prometheus.Labels{}}
currentMapping := metricMapping{Labels: prometheus.Labels{}}
for i, line := range lines {
line := strings.TrimSpace(line)
line = strings.TrimSpace(line)
switch state {
case SEARCHING:
@ -81,15 +92,15 @@ func (m *metricMapper) initFromString(fileContents string) error {
return fmt.Errorf("Line %d: missing terminating newline", i)
}
if line == "" {
if len(currentMapping.labels) == 0 {
if len(currentMapping.Labels) == 0 {
return fmt.Errorf("Line %d: metric mapping didn't set any labels", i)
}
if _, ok := currentMapping.labels["name"]; !ok {
if _, ok := currentMapping.Labels["name"]; !ok {
return fmt.Errorf("Line %d: metric mapping didn't set a metric name", i)
}
parsedMappings = append(parsedMappings, currentMapping)
state = SEARCHING
currentMapping = metricMapping{labels: prometheus.Labels{}}
currentMapping = metricMapping{Labels: prometheus.Labels{}}
continue
}
if err := m.updateMapping(line, i, &currentMapping); err != nil {
@ -102,40 +113,90 @@ func (m *metricMapper) initFromString(fileContents string) error {
m.mutex.Lock()
defer m.mutex.Unlock()
m.mappings = parsedMappings
m.Mappings = parsedMappings
mappingsCount.Set(float64(len(parsedMappings)))
return nil
}
func (m *metricMapper) initFromYamlString(fileContents string) error {
var n metricMapper
if err := yaml.Unmarshal([]byte(fileContents), &n); err != nil {
return err
}
if n.Defaults.Buckets == nil || len(n.Defaults.Buckets) == 0 {
n.Defaults.Buckets = prometheus.DefBuckets
}
for i := range n.Mappings {
currentMapping := &n.Mappings[i]
if !metricLineRE.MatchString(currentMapping.Match) {
return fmt.Errorf("invalid match: %s", currentMapping.Match)
}
// Translate the glob-style metric match line into a proper regex that we
// can use to match metrics later on.
metricRe := strings.Replace(currentMapping.Match, ".", "\\.", -1)
metricRe = strings.Replace(metricRe, "*", "([^.]+)", -1)
currentMapping.regex = regexp.MustCompile("^" + metricRe + "$")
if currentMapping.TimerType == "" {
currentMapping.TimerType = n.Defaults.TimerType
}
if currentMapping.Buckets == nil || len(currentMapping.Buckets) == 0 {
currentMapping.Buckets = n.Defaults.Buckets
}
}
m.mutex.Lock()
defer m.mutex.Unlock()
m.Defaults = n.Defaults
m.Mappings = n.Mappings
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
}
switch strings.ToLower(filepath.Ext(fileName)) {
case ".yaml", ".yml":
return m.initFromYamlString(string(mappingStr))
default:
return m.initFromString(string(mappingStr))
}
}
func (m *metricMapper) getMapping(statsdMetric string) (labels prometheus.Labels, present bool) {
func (m *metricMapper) getMapping(statsdMetric string) (*metricMapping, prometheus.Labels, bool) {
m.mutex.Lock()
defer m.mutex.Unlock()
for _, mapping := range m.mappings {
for _, mapping := range m.Mappings {
matches := mapping.regex.FindStringSubmatchIndex(statsdMetric)
if len(matches) == 0 {
continue
}
labels := prometheus.Labels{}
for label, valueExpr := range mapping.labels {
for label, valueExpr := range mapping.Labels {
value := mapping.regex.ExpandString([]byte{}, valueExpr, statsdMetric, matches)
labels[label] = string(value)
}
return labels, true
return &mapping, labels, true
}
return nil, false
return nil, nil, false
}
func (m *metricMapper) updateMapping(line string, i int, mapping *metricMapping) error {
@ -147,6 +208,6 @@ func (m *metricMapper) updateMapping(line string, i int, mapping *metricMapping)
if label == "name" && !metricNameRE.MatchString(value) {
return fmt.Errorf("Line %d: metric name '%s' doesn't match regex '%s'", i, value, metricNameRE)
}
(*mapping).labels[label] = value
(*mapping).Labels[label] = value
return nil
}