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expression.go
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expression.go
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package hbsdb
import (
"fmt"
"strings"
"github.com/Cepave/open-falcon-backend/common/model"
log "github.com/sirupsen/logrus"
)
func QueryExpressions() (ret []*model.NewExpression, err error) {
sql := "select id, expression, func, op, right_value, max_step, priority, note, action_id from expression where action_id>0 and pause=0"
rows, err := DB.Query(sql)
if err != nil {
log.Println("ERROR:", err)
return ret, err
}
defer rows.Close()
for rows.Next() {
e := model.NewExpression{}
var exp string
err = rows.Scan(
&e.ID,
&exp,
&e.Func,
&e.Operator,
&e.RightValue,
&e.MaxStep,
&e.Priority,
&e.Note,
&e.ActionID,
)
if err != nil {
log.Println("WARN:", err)
continue
}
e.Metric, e.Tags, err = parseExpression(exp)
if err != nil {
log.Println("ERROR:", err)
continue
}
ret = append(ret, &e)
}
return ret, nil
}
func parseExpression(exp string) (metric string, tags map[string]string, err error) {
left := strings.Index(exp, "(")
right := strings.Index(exp, ")")
tagStrs := strings.TrimSpace(exp[left+1 : right])
arr := strings.Fields(tagStrs)
if len(arr) < 2 {
err = fmt.Errorf("tag not enough. exp: %s", exp)
return
}
tags = make(map[string]string)
for _, item := range arr {
kv := strings.Split(item, "=")
if len(kv) != 2 {
err = fmt.Errorf("parse %s fail", exp)
return
}
tags[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1])
}
metric, exists := tags["metric"]
if !exists {
err = fmt.Errorf("no metric give of %s", exp)
return
}
delete(tags, "metric")
return
}