/
store.go
163 lines (138 loc) · 3.78 KB
/
store.go
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// Package store provides a store for the youtube service metadata
package store
import (
"crypto/sha1"
"encoding/json"
"fmt"
log "github.com/go-pkgz/lgr"
"github.com/pkg/errors"
bolt "go.etcd.io/bbolt"
"github.com/umputun/feed-master/app/youtube/channel"
)
// BoltDB store for metadata related to downloaded YouTube audio.
type BoltDB struct {
*bolt.DB
}
// Save to bolt, skip if found
func (s *BoltDB) Save(entry channel.Entry) (bool, error) {
var created bool
key, keyErr := func() ([]byte, error) {
h := sha1.New()
if _, err := h.Write([]byte(entry.VideoID)); err != nil {
return nil, err
}
return []byte(fmt.Sprintf("%d-%x", entry.Published.Unix(), h.Sum(nil))), nil
}()
if keyErr != nil {
return created, errors.Wrapf(keyErr, "failed to generate key for %s", entry.VideoID)
}
err := s.DB.Update(func(tx *bolt.Tx) error {
bucket, e := tx.CreateBucketIfNotExists([]byte(entry.ChannelID))
if e != nil {
return errors.Wrapf(e, "create bucket %s", entry.ChannelID)
}
if bucket.Get(key) != nil {
return nil
}
jdata, jerr := json.Marshal(&entry)
if jerr != nil {
return errors.Wrapf(jerr, "marshal entry %s", entry.VideoID)
}
log.Printf("[INFO] save %+v - %s", string(key), entry)
e = bucket.Put(key, jdata)
if e != nil {
return errors.Wrapf(e, "save entry %s", entry.VideoID)
}
created = true
return e
})
return created, err
}
// Exist checks if entry exists
func (s *BoltDB) Exist(entry channel.Entry) (bool, error) {
var found bool
key, keyErr := func() ([]byte, error) {
h := sha1.New()
if _, err := h.Write([]byte(entry.VideoID)); err != nil {
return nil, err
}
return []byte(fmt.Sprintf("%d-%x", entry.Published.Unix(), h.Sum(nil))), nil
}()
if keyErr != nil {
return found, errors.Wrapf(keyErr, "failed to generate key for %s", entry.VideoID)
}
err := s.DB.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(entry.ChannelID))
if bucket == nil {
return nil
}
if bucket.Get(key) != nil {
found = true
}
return nil
})
return found, err
}
// Load entries from bolt for a given channel, up to max in reverse order (from newest to oldest)
func (s *BoltDB) Load(channelID string, max int) ([]channel.Entry, error) {
var result []channel.Entry
err := s.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(channelID))
if bucket == nil {
return fmt.Errorf("no bucket for %s", channelID)
}
c := bucket.Cursor()
for k, v := c.Last(); k != nil; k, v = c.Prev() {
var item channel.Entry
if err := json.Unmarshal(v, &item); err != nil {
log.Printf("[WARN] failed to unmarshal, %v", err)
continue
}
if len(result) >= max {
break
}
result = append(result, item)
}
return nil
})
return result, err
}
// Channels returns list of channels (buckets)
func (s *BoltDB) Channels() (result []string, err error) {
err = s.View(func(tx *bolt.Tx) error {
return tx.ForEach(func(name []byte, _ *bolt.Bucket) error { // nolint
result = append(result, string(name))
return nil
})
})
return result, err
}
// RemoveOld removes old entries from bolt and returns the list of removed entry.File
// the caller should delete the files
func (s *BoltDB) RemoveOld(channelID string, keep int) ([]string, error) {
deleted := 0
var res []string
err := s.DB.Update(func(tx *bolt.Tx) (e error) {
bucket := tx.Bucket([]byte(channelID))
if bucket == nil {
return fmt.Errorf("no bucket for %s", channelID)
}
recs := 0
c := bucket.Cursor()
for k, v := c.Last(); k != nil; k, v = c.Prev() {
recs++
if recs > keep {
var item channel.Entry
if err := json.Unmarshal(v, &item); err != nil {
log.Printf("[WARN] failed to unmarshal, %v", err)
continue
}
res = append(res, item.File)
e = bucket.Delete(k)
deleted++
}
}
return e
})
return res, err
}