142 lines
4.2 KiB
Go
142 lines
4.2 KiB
Go
package avatar
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import (
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"bytes"
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"fmt"
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"io"
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"log"
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bolt "go.etcd.io/bbolt"
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)
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// BoltDB implements avatar store with bolt
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// using separate db (file) with "avatars" bucket to keep image bin and "metas" bucket
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// to keep sha1 of picture. avatarID (base file name) used as a key for both.
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type BoltDB struct {
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fileName string // full path to boltdb
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db *bolt.DB
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}
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const avatarsBktName = "avatars"
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const metasBktName = "metas"
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// NewBoltDB makes bolt avatar store
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func NewBoltDB(fileName string, options bolt.Options) (*BoltDB, error) {
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db, err := bolt.Open(fileName, 0600, &options) //nolint
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if err != nil {
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return nil, fmt.Errorf("failed to make boltdb for %s: %w", fileName, err)
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}
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err = db.Update(func(tx *bolt.Tx) error {
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if _, e := tx.CreateBucketIfNotExists([]byte(avatarsBktName)); e != nil {
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return fmt.Errorf("failed to create top level bucket %s: %w", avatarsBktName, e)
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}
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if _, e := tx.CreateBucketIfNotExists([]byte(metasBktName)); e != nil {
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return fmt.Errorf("failed to create top metas bucket %s: %w", metasBktName, e)
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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, fmt.Errorf("failed to initialize boltdb db %q buckets: %w", fileName, err)
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}
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return &BoltDB{db: db, fileName: fileName}, nil
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}
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// Put avatar to bolt, key by avatarID. Trying to resize image and lso calculates sha1 of the file for ID func
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func (b *BoltDB) Put(userID string, reader io.Reader) (avatar string, err error) {
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id := encodeID(userID)
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avatarID := id + imgSfx
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err = b.db.Update(func(tx *bolt.Tx) error {
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buf := &bytes.Buffer{}
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if _, err = io.Copy(buf, reader); err != nil {
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return fmt.Errorf("can't read avatar %s: %w", avatarID, err)
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}
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if err = tx.Bucket([]byte(avatarsBktName)).Put([]byte(avatarID), buf.Bytes()); err != nil {
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return fmt.Errorf("can't put to bucket with %s: %w", avatarID, err)
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}
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// store sha1 of the image
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return tx.Bucket([]byte(metasBktName)).Put([]byte(avatarID), []byte(hash(buf.Bytes(), avatarID)))
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})
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return avatarID, err
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}
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// Get avatar reader for avatar id.image, avatarID used as the direct key
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func (b *BoltDB) Get(avatarID string) (reader io.ReadCloser, size int, err error) {
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buf := &bytes.Buffer{}
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err = b.db.View(func(tx *bolt.Tx) error {
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data := tx.Bucket([]byte(avatarsBktName)).Get([]byte(avatarID))
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if data == nil {
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return fmt.Errorf("can't load avatar %s", avatarID)
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}
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size, err = buf.Write(data)
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if err != nil {
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return fmt.Errorf("failed to write for %s: %w", avatarID, err)
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}
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return nil
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})
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return io.NopCloser(buf), size, err
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}
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// ID returns a fingerprint of the avatar content.
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func (b *BoltDB) ID(avatarID string) (id string) {
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data := []byte{}
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err := b.db.View(func(tx *bolt.Tx) error {
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if data = tx.Bucket([]byte(metasBktName)).Get([]byte(avatarID)); data == nil {
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return fmt.Errorf("can't load avatar's id for %s", avatarID)
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}
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return nil
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})
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if err != nil { // failed to get ID, use encoded avatarID
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log.Printf("[DEBUG] can't get avatar info '%s', %s", avatarID, err)
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return encodeID(avatarID)
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}
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return string(data)
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}
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// Remove avatar from bolt
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func (b *BoltDB) Remove(avatarID string) (err error) {
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return b.db.Update(func(tx *bolt.Tx) error {
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bkt := tx.Bucket([]byte(avatarsBktName))
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if bkt.Get([]byte(avatarID)) == nil {
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return fmt.Errorf("avatar key not found, %s", avatarID)
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}
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if err = tx.Bucket([]byte(avatarsBktName)).Delete([]byte(avatarID)); err != nil {
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return fmt.Errorf("can't delete avatar object %s: %w", avatarID, err)
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}
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if err = tx.Bucket([]byte(metasBktName)).Delete([]byte(avatarID)); err != nil {
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return fmt.Errorf("can't delete meta object %s: %w", avatarID, err)
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}
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return nil
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})
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}
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// List all avatars (ids) from metas bucket
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// note: id includes .image suffix
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func (b *BoltDB) List() (ids []string, err error) {
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err = b.db.View(func(tx *bolt.Tx) error {
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return tx.Bucket([]byte(metasBktName)).ForEach(func(k, _ []byte) error {
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ids = append(ids, string(k))
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return nil
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})
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})
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if err != nil {
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return nil, fmt.Errorf("failed to list: %w", err)
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}
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return ids, nil
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}
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// Close bolt store
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func (b *BoltDB) Close() error {
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if err := b.db.Close(); err != nil {
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return fmt.Errorf("failed to close %s: %w", b.fileName, err)
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}
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return nil
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}
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func (b *BoltDB) String() string {
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return fmt.Sprintf("boltdb, path=%s", b.fileName)
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}
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