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boltdbresumer.go
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boltdbresumer.go
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// Package boltdbresumer provides a Resumer implementation that uses a Bolt database file as storage.
package boltdbresumer
import (
"encoding/json"
"fmt"
"runtime/debug"
"strconv"
"time"
"go.etcd.io/bbolt"
)
// Keys for the persisten storage.
var Keys = struct {
InfoHash []byte
Port []byte
Name []byte
Trackers []byte
URLList []byte
FixedPeers []byte
Dest []byte
Info []byte
Bitfield []byte
AddedAt []byte
BytesDownloaded []byte
BytesUploaded []byte
BytesWasted []byte
SeededFor []byte
Started []byte
}{
InfoHash: []byte("info_hash"),
Port: []byte("port"),
Name: []byte("name"),
Trackers: []byte("trackers"),
URLList: []byte("url_list"),
FixedPeers: []byte("fixed_peers"),
Dest: []byte("dest"),
Info: []byte("info"),
Bitfield: []byte("bitfield"),
AddedAt: []byte("added_at"),
BytesDownloaded: []byte("bytes_downloaded"),
BytesUploaded: []byte("bytes_uploaded"),
BytesWasted: []byte("bytes_wasted"),
SeededFor: []byte("seeded_for"),
Started: []byte("started"),
}
// Resumer contains methods for saving/loading resume information of a torrent to a BoltDB database.
type Resumer struct {
db *bbolt.DB
bucket []byte
}
// New returns a new Resumer.
func New(db *bbolt.DB, bucket []byte) (*Resumer, error) {
err := db.Update(func(tx *bbolt.Tx) error {
_, err2 := tx.CreateBucketIfNotExists(bucket)
return err2
})
if err != nil {
return nil, err
}
return &Resumer{
db: db,
bucket: bucket,
}, nil
}
// Write the torrent spec for torrent with `torrentID`.
func (r *Resumer) Write(torrentID string, spec *Spec) error {
port := strconv.Itoa(spec.Port)
trackers, err := json.Marshal(spec.Trackers)
if err != nil {
return err
}
urlList, err := json.Marshal(spec.URLList)
if err != nil {
return err
}
fixedPeers, err := json.Marshal(spec.FixedPeers)
if err != nil {
return err
}
return r.db.Update(func(tx *bbolt.Tx) error {
b, err := tx.Bucket(r.bucket).CreateBucketIfNotExists([]byte(torrentID))
if err != nil {
return err
}
_ = b.Put(Keys.InfoHash, spec.InfoHash)
_ = b.Put(Keys.Port, []byte(port))
_ = b.Put(Keys.Name, []byte(spec.Name))
_ = b.Put(Keys.Trackers, trackers)
_ = b.Put(Keys.URLList, urlList)
_ = b.Put(Keys.FixedPeers, fixedPeers)
_ = b.Put(Keys.Info, spec.Info)
_ = b.Put(Keys.Bitfield, spec.Bitfield)
_ = b.Put(Keys.AddedAt, []byte(spec.AddedAt.Format(time.RFC3339)))
_ = b.Put(Keys.BytesDownloaded, []byte(strconv.FormatInt(spec.BytesDownloaded, 10)))
_ = b.Put(Keys.BytesUploaded, []byte(strconv.FormatInt(spec.BytesUploaded, 10)))
_ = b.Put(Keys.BytesWasted, []byte(strconv.FormatInt(spec.BytesWasted, 10)))
_ = b.Put(Keys.SeededFor, []byte(spec.SeededFor.String()))
_ = b.Put(Keys.Started, []byte(strconv.FormatBool(spec.Started)))
return nil
})
}
// WriteInfo writes only the info dict of a torrent.
func (r *Resumer) WriteInfo(torrentID string, value []byte) error {
return r.db.Update(func(tx *bbolt.Tx) error {
b := tx.Bucket(r.bucket).Bucket([]byte(torrentID))
if b == nil {
return nil
}
return b.Put(Keys.Info, value)
})
}
// WriteBitfield writes only bitfield of a torrent.
func (r *Resumer) WriteBitfield(torrentID string, value []byte) error {
return r.db.Update(func(tx *bbolt.Tx) error {
b := tx.Bucket(r.bucket).Bucket([]byte(torrentID))
if b == nil {
return nil
}
return b.Put(Keys.Bitfield, value)
})
}
// WriteStarted writes the start status of a torrent.
func (r *Resumer) WriteStarted(torrentID string, value bool) error {
return r.db.Update(func(tx *bbolt.Tx) error {
b := tx.Bucket(r.bucket).Bucket([]byte(torrentID))
if b == nil {
return nil
}
return b.Put(Keys.Started, []byte(strconv.FormatBool(value)))
})
}
func (r *Resumer) Read(torrentID string) (spec *Spec, err error) {
defer debug.SetPanicOnFault(debug.SetPanicOnFault(true))
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("cannot read torrent %q from db: %s", torrentID, r)
}
}()
err = r.db.Update(func(tx *bbolt.Tx) error {
b := tx.Bucket(r.bucket).Bucket([]byte(torrentID))
if b == nil {
return fmt.Errorf("bucket not found: %q", torrentID)
}
value := b.Get(Keys.InfoHash)
if value == nil {
return fmt.Errorf("key not found: %q", string(Keys.InfoHash))
}
spec = new(Spec)
spec.InfoHash = make([]byte, len(value))
copy(spec.InfoHash, value)
var err error
value = b.Get(Keys.Port)
spec.Port, err = strconv.Atoi(string(value))
if err != nil {
return err
}
value = b.Get(Keys.Name)
if value != nil {
spec.Name = string(value)
}
value = b.Get(Keys.Trackers)
if value != nil {
err = json.Unmarshal(value, &spec.Trackers)
if err != nil {
// Try to unmarshal old format `[]string`
trackers := make([]string, 0)
err = json.Unmarshal(value, &trackers)
if err != nil {
return err
}
// Migrate to new format `[][]string`
spec.Trackers = make([][]string, len(trackers))
for i, t := range trackers {
spec.Trackers[i] = []string{t}
}
// Save in new format
bt, err := json.Marshal(spec.Trackers)
if err != nil {
return err
}
err = b.Put(Keys.Trackers, bt)
if err != nil {
return err
}
}
}
value = b.Get(Keys.URLList)
if value != nil {
err = json.Unmarshal(value, &spec.URLList)
if err != nil {
return err
}
}
value = b.Get(Keys.FixedPeers)
if value != nil {
err = json.Unmarshal(value, &spec.FixedPeers)
if err != nil {
return err
}
}
value = b.Get(Keys.Info)
if value != nil {
spec.Info = make([]byte, len(value))
copy(spec.Info, value)
}
value = b.Get(Keys.Bitfield)
if value != nil {
spec.Bitfield = make([]byte, len(value))
copy(spec.Bitfield, value)
}
value = b.Get(Keys.AddedAt)
if value != nil {
spec.AddedAt, err = time.Parse(time.RFC3339, string(value))
if err != nil {
return err
}
}
value = b.Get(Keys.BytesDownloaded)
if value != nil {
spec.BytesDownloaded, err = strconv.ParseInt(string(value), 10, 64)
if err != nil {
return err
}
}
value = b.Get(Keys.BytesUploaded)
if value != nil {
spec.BytesUploaded, err = strconv.ParseInt(string(value), 10, 64)
if err != nil {
return err
}
}
value = b.Get(Keys.BytesWasted)
if value != nil {
spec.BytesWasted, err = strconv.ParseInt(string(value), 10, 64)
if err != nil {
return err
}
}
value = b.Get(Keys.SeededFor)
if value != nil {
spec.SeededFor, err = time.ParseDuration(string(value))
if err != nil {
return err
}
}
value = b.Get(Keys.Started)
if value != nil {
spec.Started, err = strconv.ParseBool(string(value))
if err != nil {
return err
}
}
return nil
})
return
}