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data.go
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data.go
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package server
import (
"errors"
"math"
"strconv"
"strings"
"sync"
"time"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/metricbeat/mb"
)
type template struct {
Namespace string
Delimiter string
Parts []string
Tags map[string]string
}
type metricProcessor struct {
templates *tree
defaultTemplate template
sync.RWMutex
}
func NewMetricProcessor(templates []TemplateConfig, defaultTemplate TemplateConfig) *metricProcessor {
templateTree := NewTree(getTemplateFromConfig(defaultTemplate))
for _, t := range templates {
templateTree.Insert(t.Filter, getTemplateFromConfig(t))
}
return &metricProcessor{
templates: templateTree,
defaultTemplate: getTemplateFromConfig(defaultTemplate),
}
}
func getTemplateFromConfig(config TemplateConfig) template {
return template{
Namespace: config.Namespace,
Tags: config.Tags,
Delimiter: config.Delimiter,
Parts: strings.Split(config.Template, "."),
}
}
func (m *metricProcessor) AddTemplate(t TemplateConfig) {
m.Lock()
template := getTemplateFromConfig(t)
m.templates.Insert(t.Filter, template)
m.Unlock()
}
func (m *metricProcessor) RemoveTemplate(template TemplateConfig) {
m.Lock()
m.templates.Delete(template.Filter)
m.Unlock()
}
func (m *metricProcessor) Process(message string) (common.MapStr, error) {
metric, timestamp, value, err := m.splitMetric(message)
if err != nil {
return nil, err
}
parts := strings.Split(metric, ".")
t := m.FindTemplate(parts)
var name, namespace string
var tags common.MapStr
if t == nil {
name, tags = m.defaultTemplate.Apply(parts)
namespace = m.defaultTemplate.Namespace
} else {
name, tags = t.Apply(parts)
namespace = t.Namespace
}
event := common.MapStr{
"@timestamp": timestamp,
name: value,
mb.NamespaceKey: namespace,
}
if len(tags) != 0 {
event["tag"] = tags
}
return event, nil
}
func (m *metricProcessor) FindTemplate(metric []string) *template {
return m.templates.Search(metric)
}
func (m *metricProcessor) splitMetric(metric string) (string, common.Time, float64, error) {
var metricName string
var timestamp common.Time
var value float64
parts := strings.Fields(metric)
currentTime := common.Time(time.Now())
if len(parts) < 2 {
return "", currentTime, 0, errors.New("Message not in expected format")
} else {
metricName = parts[0]
val, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return "", currentTime, 0, errors.New("Unable to parse metric value")
} else {
value = val
}
}
if len(parts) == 3 {
if parts[2] == "N" {
timestamp = currentTime
}
ts, err := strconv.ParseFloat(parts[2], 64)
if err != nil {
return "", currentTime, 0, errors.New("Unable to parse timestamp")
}
if ts != -1 {
timestamp = common.Time(time.Unix(int64(ts), int64((ts-math.Floor(ts))*float64(time.Second))))
} else {
timestamp = currentTime
}
} else {
timestamp = currentTime
}
return metricName, timestamp, value, nil
}
func (t *template) Apply(parts []string) (string, common.MapStr) {
tags := make(common.MapStr)
metric := make([]string, 0)
for tagKey, tagVal := range t.Tags {
tags[tagKey] = tagVal
}
tagsMap := make(map[string][]string)
for i := 0; i < len(t.Parts); i++ {
if t.Parts[i] == "metric" {
metric = append(metric, parts[i])
} else if t.Parts[i] == "metric*" {
metric = append(metric, parts[i:]...)
} else if t.Parts[i] != "" {
tagsMap[t.Parts[i]] = append(tagsMap[t.Parts[i]], parts[i])
}
}
for key, value := range tagsMap {
tags[key] = strings.Join(value, t.Delimiter)
}
if len(metric) == 0 {
return "", tags
} else {
return strings.Join(metric, t.Delimiter), tags
}
}