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event.go
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event.go
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// Copyright 2016 Eleme Inc. All rights reserved.
package models
import (
"crypto/sha1"
"encoding/hex"
"fmt"
"strings"
)
// Event is the alerting event.
type Event struct {
ID string `json:"id"`
Project *Project `json:"project"`
User *User `json:"user"`
Rule *Rule `json:"rule"`
Index *Index `json:"index"`
Metric *Metric `json:"metric"`
RuleTranslatedComment string `json:"ruleTranslatedComment"`
}
// NewEvent returns a new event from metric and index.
func NewEvent(m *Metric, idx *Index) *Event {
ev := &Event{Metric: m, Index: idx}
ev.generateID()
return ev
}
// generateID generates a sha1 string id for the event.
func (ev *Event) generateID() {
slug := fmt.Sprintf("%s:%d", ev.Metric.Name, ev.Metric.Stamp)
hash := sha1.New()
hash.Write([]byte(slug))
ev.ID = hex.EncodeToString(hash.Sum(nil))
}
// TranslateRuleComment translates rule comment variables with metric name and
// rule pattern.
//
// m := &Metric{Name: "timer.count_ps.foo"}
// r := &Rule{Pattern: "timer.count_ps.*", Comment: "$1 timing"}
// ev := &Event{Metric:m, Rule:r}
// ev.TranslateRuleComment() // ev.RuleTranslatedComment => "foo timing"
//
func (ev *Event) TranslateRuleComment() {
patternParts := strings.Split(ev.Rule.Pattern, ".")
metricParts := strings.Split(ev.Metric.Name, ".")
if len(patternParts) != len(metricParts) { // Unexcepted input metric and pattern.
ev.RuleTranslatedComment = ev.Rule.Comment // Use original comment
return
}
i := 0
s := ev.Rule.Comment
for j, patternPart := range patternParts {
if patternPart == "*" {
i++
repl := fmt.Sprintf("$%d", i)
s = strings.Replace(s, repl, metricParts[j], 1)
}
}
ev.RuleTranslatedComment = s
}