401 lines
9.0 KiB
Go
401 lines
9.0 KiB
Go
package boltease
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import (
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/boltdb/bolt"
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)
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// This is a library for easing the use of bolt dbs
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// DB is a struct for accomplishing this
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type DB struct {
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filename string
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boltDB *bolt.DB
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mode os.FileMode
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options *bolt.Options
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dbIsOpen bool
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}
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// Create makes sure we can get open the file and returns the DB object
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func Create(fn string, m os.FileMode, opts *bolt.Options) (*DB, error) {
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var err error
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b := DB{filename: fn, mode: m, options: opts}
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b.boltDB, err = bolt.Open(fn, m, opts)
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if err != nil {
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return nil, err
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}
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defer b.boltDB.Close()
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return &b, nil
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}
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func (b *DB) OpenDB() error {
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if b.dbIsOpen {
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// DB is already open, that's fine.
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return nil
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}
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var err error
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if b.boltDB, err = bolt.Open(b.filename, b.mode, b.options); err != nil {
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return err
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}
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b.dbIsOpen = true
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return err
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}
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func (b *DB) CloseDB() error {
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if !b.dbIsOpen {
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// DB is already closed, that's fine.
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return nil
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}
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var err error
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if err = b.boltDB.Close(); err != nil {
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return err
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}
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b.dbIsOpen = false
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return err
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}
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// MkBucketPath builds all buckets in the string slice
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func (b *DB) MkBucketPath(path []string) error {
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var err error
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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var err error
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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// Create it
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bkt, err = tx.CreateBucket([]byte(path[0]))
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if err != nil {
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// error creating
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return err
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}
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}
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if len(path) > 1 {
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path = path[1:]
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for i := range path {
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nextBkt := bkt.Bucket([]byte(path[i]))
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if nextBkt == nil {
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// Create it
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nextBkt, err = bkt.CreateBucket([]byte(path[i]))
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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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bkt = nextBkt
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}
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}
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return err
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})
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return err
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}
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// GetValue returns the value at path
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// path is a slice of strings
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// key is the key to get
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func (b *DB) GetValue(path []string, key string) (string, error) {
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var err error
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var ret string
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return ret, err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.View(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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for idx := 1; idx < len(path); idx++ {
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bkt = bkt.Bucket([]byte(path[idx]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + strings.Join(path[:idx], "/"))
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}
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}
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// newBkt should have the last bucket in the path
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ret = string(bkt.Get([]byte(key)))
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return nil
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})
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return ret, err
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}
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// SetValue sets the value of key at path to val
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// path is a slice of tokens
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func (b *DB) SetValue(path []string, key, val string) error {
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var err error
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return err
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}
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defer b.CloseDB()
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}
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err = b.MkBucketPath(path)
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if err != nil {
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return err
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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for idx := 1; idx < len(path); idx++ {
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bkt, err = bkt.CreateBucketIfNotExists([]byte(path[idx]))
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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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// bkt should have the last bucket in the path
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return bkt.Put([]byte(key), []byte(val))
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})
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return err
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}
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// GetInt returns the value at path
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// If the value cannot be parsed as an int, error
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func (b *DB) GetInt(path []string, key string) (int, error) {
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var ret int
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r, err := b.GetValue(path, key)
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if err == nil {
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ret, err = strconv.Atoi(r)
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}
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return ret, err
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}
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// SetInt Sets an integer value
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func (b *DB) SetInt(path []string, key string, val int) error {
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return b.SetValue(path, key, strconv.Itoa(val))
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}
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// GetBool returns the value at 'path'
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// If the value cannot be parsed as a bool, error
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// We check 'true/false' and '1/0', else error
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func (b *DB) GetBool(path []string, key string) (bool, error) {
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var ret bool
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r, err := b.GetValue(path, key)
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if err == nil {
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if r == "true" || r == "1" {
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ret = true
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} else if r != "false" && r != "0" {
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err = fmt.Errorf("Cannot parse as a boolean")
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}
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}
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return ret, err
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}
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// SetBool Sets a boolean value
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func (b *DB) SetBool(path []string, key string, val bool) error {
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if val {
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return b.SetValue(path, key, "true")
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}
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return b.SetValue(path, key, "false")
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}
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// GetTimestamp returns the value at 'path'
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// If the value cannot be parsed as a RFC3339, error
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func (b *DB) GetTimestamp(path []string, key string) (time.Time, error) {
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r, err := b.GetValue(path, key)
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if err == nil {
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return time.Parse(time.RFC3339, r)
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}
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return time.Unix(0, 0), err
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}
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// SetTimestamp saves a timestamp into the db
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func (b *DB) SetTimestamp(path []string, key string, val time.Time) error {
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return b.SetValue(path, key, val.Format(time.RFC3339))
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}
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// GetBucketList returns a list of all sub-buckets at path
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func (b *DB) GetBucketList(path []string) ([]string, error) {
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var err error
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var ret []string
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return ret, err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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var berr error
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if len(path) > 1 {
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for idx := 1; idx < len(path); idx++ {
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bkt = bkt.Bucket([]byte(path[idx]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + strings.Join(path[:idx], " / "))
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}
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}
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}
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// bkt should have the last bucket in the path
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berr = bkt.ForEach(func(k, v []byte) error {
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if v == nil {
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// Must be a bucket
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ret = append(ret, string(k))
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}
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return nil
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})
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return berr
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})
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return ret, err
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}
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// GetKeyList returns a list of all keys at path
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func (b *DB) GetKeyList(path []string) ([]string, error) {
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var err error
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var ret []string
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return ret, err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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var berr error
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if len(path) > 1 {
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for idx := 1; idx < len(path); idx++ {
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bkt = bkt.Bucket([]byte(path[idx]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + strings.Join(path[:idx], " / "))
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}
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}
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}
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// bkt should have the last bucket in the path
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berr = bkt.ForEach(func(k, v []byte) error {
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if v != nil {
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// Must be a key
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ret = append(ret, string(k))
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}
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return nil
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})
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return berr
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})
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return ret, err
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}
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// DeletePair deletes the pair with key at path
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func (b *DB) DeletePair(path []string, key string) error {
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var err error
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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if len(path) > 1 {
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var newBkt *bolt.Bucket
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for idx := 1; idx < len(path); idx++ {
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newBkt = bkt.Bucket([]byte(path[idx]))
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if newBkt == nil {
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return fmt.Errorf("Couldn't find bucket " + strings.Join(path[:idx], "/"))
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}
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}
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bkt = newBkt
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}
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// bkt should have the last bucket in the path
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// Test to make sure that key is a pair, if so, delete it
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if tst := bkt.Bucket([]byte(key)); tst == nil {
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return bkt.Delete([]byte(key))
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}
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return nil
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})
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return err
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}
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// DeleteBucket deletes the bucket key at path
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func (b *DB) DeleteBucket(path []string, key string) error {
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var err error
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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for idx := 1; idx < len(path); idx++ {
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bkt = bkt.Bucket([]byte(path[idx]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + strings.Join(path[:idx], "/"))
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}
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}
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// bkt should have the last bucket in the path
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// Test to make sure that key is a bucket, if so, delete it
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if tst := bkt.Bucket([]byte(key)); tst != nil {
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return bkt.DeleteBucket([]byte(key))
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}
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return nil
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})
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return err
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}
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// GetValueList returns a string slice of all values in the bucket at path
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func (b *DB) GetValueList(path []string) ([]string, error) {
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var err error
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var ret []string
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if !b.dbIsOpen {
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if err = b.OpenDB(); err != nil {
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return ret, err
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}
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defer b.CloseDB()
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}
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err = b.boltDB.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(path[0]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + path[0])
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}
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var berr error
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if len(path) > 1 {
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for idx := 1; idx < len(path); idx++ {
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bkt = bkt.Bucket([]byte(path[idx]))
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if bkt == nil {
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return fmt.Errorf("Couldn't find bucket " + strings.Join(path[:idx], " / "))
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}
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}
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}
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// bkt should have the last bucket in the path
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berr = bkt.ForEach(func(k, v []byte) error {
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if v != nil {
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// Must be a key
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ret = append(ret, string(v))
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}
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return nil
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})
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return berr
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})
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return ret, err
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}
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