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handler.go
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handler.go
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package sieve
import (
"bytes"
"encoding/json"
"fmt"
"regexp"
"text/template"
)
type EventHandler interface {
HandleEvent(results []string, event *Event) error
}
// SimpleEventHandler assigns event description formatted based on regex groups
type SimpleEventHandler struct {
*template.Template
Severity string
}
func NewSimpleEventHandler(severity string, descTmpl string) SimpleEventHandler {
return SimpleEventHandler{simpleTemplate(descTmpl), severity}
}
func (handler SimpleEventHandler) HandleEvent(results []string, event *Event) error {
var output bytes.Buffer
err := handler.Execute(&output, results)
if err != nil {
return fmt.Errorf("error in custom event handler %s; %s", event.Type, err)
}
event.Desc = output.String()
event.Severity = handler.Severity
return nil
}
// SimpleEventHandler assigns event description formatted based on
// fields of JSON extracted from the first and only regex match group
type JsonEventHandler struct {
*template.Template
Severity string
}
func NewJsonEventHandler(severity string, descTmpl string) JsonEventHandler {
return JsonEventHandler{template.Must(template.New("").Parse(descTmpl)), severity}
}
func (handler JsonEventHandler) HandleEvent(results []string, event *Event) error {
if len(results) < 1 {
return fmt.Errorf("no regex matches found")
}
err := json.Unmarshal([]byte(results[1]), &event.Info)
if err != nil {
return err
}
var output bytes.Buffer
err = handler.Execute(&output, event.Info)
if err != nil {
return fmt.Errorf("error in known event handler %s; %s", event.Type, err)
}
event.Desc = output.String()
event.Severity = handler.Severity
return nil
}
var templateIndexRe *regexp.Regexp
func simpleTemplate(tmpl string) *template.Template {
// replace $1 with {{index . 1}} as understood by text/template
tmpl = templateIndexRe.ReplaceAllString(tmpl, "{{index . $1}}")
return template.Must(template.New("").Parse(tmpl))
}
func init() {
templateIndexRe = regexp.MustCompile(`\$(\d+)`)
}