115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
// Copyright 2016 Tim Shannon. All rights reserved.
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// Use of this source code is governed by the MIT license
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// that can be found in the LICENSE file.
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// Package datastore manages the bolt data files and the reading and writing data to them
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package datastore
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import (
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"bytes"
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"encoding/json"
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"errors"
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"io"
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"time"
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"github.com/boltdb/bolt"
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)
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// ErrNotFound is the error returned when a value cannot be found in the store for the given key
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var ErrNotFound = errors.New("Value not found")
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// Store is a datastore for getting and setting data for a given ironsmith project
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// run on top of a Bolt DB file
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type Store struct {
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bolt *bolt.DB
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}
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// Open opens an existing datastore file, or creates a new one
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// caller is responsible for closing the datastore
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func Open(filename string) (*Store, error) {
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db, err := bolt.Open(filename, 0666, &bolt.Options{Timeout: 1 * time.Minute})
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if err != nil {
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return nil, err
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}
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store := &Store{
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bolt: db,
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}
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err = store.bolt.Update(func(tx *bolt.Tx) error {
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_, err := tx.CreateBucketIfNotExists([]byte(bucketLog))
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if err != nil {
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return err
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}
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_, err = tx.CreateBucketIfNotExists([]byte(bucketReleases))
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if err != nil {
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return err
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}
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_, err = tx.CreateBucketIfNotExists([]byte(bucketFiles))
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if err != nil {
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return err
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return store, nil
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}
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// Close closes the bolt datastore
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func (ds *Store) Close() error {
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if ds != nil {
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return ds.Close()
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}
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return nil
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}
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func (ds *Store) get(bucket string, key TimeKey, result interface{}) error {
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return ds.bolt.View(func(tx *bolt.Tx) error {
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dsValue := tx.Bucket([]byte(bucket)).Get(key.Bytes())
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if dsValue == nil {
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return ErrNotFound
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}
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if value, ok := result.([]byte); ok {
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buff := bytes.NewBuffer(value)
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_, err := io.Copy(buff, bytes.NewReader(dsValue))
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if err != nil {
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return err
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}
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return nil
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}
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return json.Unmarshal(dsValue, result)
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})
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}
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func (ds *Store) put(bucket string, key TimeKey, value interface{}) error {
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var err error
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dsValue, ok := value.([]byte)
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if !ok {
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dsValue, err = json.Marshal(value)
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if err != nil {
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return err
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}
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}
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return ds.bolt.Update(func(tx *bolt.Tx) error {
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return tx.Bucket([]byte(bucket)).Put(key.Bytes(), dsValue)
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})
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}
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func (ds *Store) delete(bucket string, key TimeKey) error {
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return ds.bolt.Update(func(tx *bolt.Tx) error {
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return tx.Bucket([]byte(bucket)).Delete(key.Bytes())
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})
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}
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