frostfs-node/pkg/util/locode/db/boltdb/calls.go
Evgenii Stratonikov 71b87155ef [] *: use stdlib errors package
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-05-19 16:42:54 +03:00

168 lines
3.8 KiB
Go

package locodebolt
import (
"encoding/json"
"errors"
"fmt"
"os"
"path"
locodedb "github.com/nspcc-dev/neofs-node/pkg/util/locode/db"
"go.etcd.io/bbolt"
)
// Open opens underlying BoltDB instance.
//
// Timeout of BoltDB opening is 3s (only for Linux or Darwin).
//
// Opens BoltDB in read-only mode if DB is read-only.
func (db *DB) Open() error {
// copy-paste from metabase:
// consider universal Open/Close for BoltDB wrappers
err := os.MkdirAll(path.Dir(db.path), db.mode)
if err != nil {
return fmt.Errorf("could not create dir for BoltDB: %w", err)
}
db.bolt, err = bbolt.Open(db.path, db.mode, db.boltOpts)
if err != nil {
return fmt.Errorf("could not open BoltDB: %w", err)
}
return nil
}
// Close closes underlying BoltDB instance.
//
// Must not be called before successful Open call.
func (db *DB) Close() error {
return db.bolt.Close()
}
func countryBucketKey(cc *locodedb.CountryCode) ([]byte, error) {
return []byte(cc.String()), nil
}
func locationBucketKey(lc *locodedb.LocationCode) ([]byte, error) {
return []byte(lc.String()), nil
}
type recordJSON struct {
CountryName string
LocationName string
SubDivName string
SubDivCode string
Latitude float64
Longitude float64
Continent string
}
func recordValue(r locodedb.Record) ([]byte, error) {
p := r.GeoPoint()
rj := &recordJSON{
CountryName: r.CountryName(),
LocationName: r.LocationName(),
SubDivName: r.SubDivName(),
SubDivCode: r.SubDivCode(),
Latitude: p.Latitude(),
Longitude: p.Longitude(),
Continent: r.Continent().String(),
}
return json.Marshal(rj)
}
func recordFromValue(data []byte) (*locodedb.Record, error) {
rj := new(recordJSON)
if err := json.Unmarshal(data, rj); err != nil {
return nil, err
}
r := new(locodedb.Record)
r.SetCountryName(rj.CountryName)
r.SetLocationName(rj.LocationName)
r.SetSubDivName(rj.SubDivName)
r.SetSubDivCode(rj.SubDivCode)
r.SetGeoPoint(locodedb.NewPoint(rj.Latitude, rj.Longitude))
cont := locodedb.ContinentFromString(rj.Continent)
r.SetContinent(&cont)
return r, nil
}
// Put saves the record by key in underlying BoltDB instance.
//
// Country code from key is used for allocating the 1st level buckets.
// Records are stored in country buckets by location code from key.
// The records are stored in internal binary JSON format.
//
// Must not be called before successful Open call.
// Must not be called in read-only mode: behavior is undefined.
func (db *DB) Put(key locodedb.Key, rec locodedb.Record) error {
return db.bolt.Update(func(tx *bbolt.Tx) error {
countryKey, err := countryBucketKey(key.CountryCode())
if err != nil {
return err
}
bktCountry, err := tx.CreateBucketIfNotExists(countryKey)
if err != nil {
return fmt.Errorf("could not create country bucket: %w", err)
}
// TODO: write country name once in Country bucket
locationKey, err := locationBucketKey(key.LocationCode())
if err != nil {
return err
}
cont, err := recordValue(rec)
if err != nil {
return err
}
return bktCountry.Put(locationKey, cont)
})
}
var errRecordNotFound = errors.New("record not found")
// Put reads the record by key from underlying BoltDB instance.
//
// Returns an error if no record is presented by key in DB.
//
// Must not be called before successful Open call.
func (db *DB) Get(key locodedb.Key) (rec *locodedb.Record, err error) {
err = db.bolt.View(func(tx *bbolt.Tx) error {
countryKey, err := countryBucketKey(key.CountryCode())
if err != nil {
return err
}
bktCountry := tx.Bucket(countryKey)
if bktCountry == nil {
return errRecordNotFound
}
locationKey, err := locationBucketKey(key.LocationCode())
if err != nil {
return err
}
data := bktCountry.Get(locationKey)
if data == nil {
return errRecordNotFound
}
rec, err = recordFromValue(data)
return err
})
return
}