forked from szaydel/statsdaemon
/
bolt_store.go
83 lines (70 loc) · 1.63 KB
/
bolt_store.go
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package main
import (
"encoding/json"
"errors"
"github.com/boltdb/bolt"
)
// MeasurePoint - struct for saving do permanent storage (eg. Bolt)
type MeasurePoint struct {
Value int64
When int64
}
var bucketName = "counters"
func storeMeasurePoint(db *bolt.DB, bucketName string, name string, mp MeasurePoint) error {
var jsonPoint []byte
if err := checkNames(bucketName, name); err != nil {
return err
}
err := db.Update(func(tx *bolt.Tx) error {
bucket, err := tx.CreateBucketIfNotExists([]byte(bucketName))
if err != nil {
return err
}
jsonPoint, err = json.Marshal(mp)
if err != nil {
return err
}
err = bucket.Put([]byte(name), jsonPoint)
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
return nil
}
func readMeasurePoint(db *bolt.DB, bucketName string, name string) (MeasurePoint, error) {
outMeasurePoint := MeasurePoint{}
if err := checkNames(bucketName, name); err != nil {
return outMeasurePoint, err
}
err := db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketName))
// if no bucket - return nil (outMeasurePoint is empty)
if bucket == nil {
return nil
}
valBuf := bucket.Get([]byte(name))
// if no key - return nil (outMeasurePoint is empty)
if len(valBuf) == 0 {
return nil
}
err := json.Unmarshal(valBuf, &outMeasurePoint)
if err != nil {
return err
}
return nil
})
return outMeasurePoint, err
}
func checkNames(bucketName string, name string) error {
if len(bucketName) == 0 {
return errors.New("bucket name can't be empty")
}
if len(name) == 0 {
return errors.New("key name can't be empty")
}
return nil
}