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sqlite-piece-completion.go
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sqlite-piece-completion.go
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// modernc.org/sqlite depends on modernc.org/libc which doesn't work for JS (and probably wasm but I
// think JS is the stronger signal).
//go:build cgo && !nosqlite
// +build cgo,!nosqlite
package storage
import (
"errors"
"path/filepath"
"sync"
"crawshaw.io/sqlite"
"crawshaw.io/sqlite/sqlitex"
"github.com/anacrolix/torrent/metainfo"
)
// sqlite is always the default when available.
func NewDefaultPieceCompletionForDir(dir string) (PieceCompletion, error) {
return NewSqlitePieceCompletion(dir)
}
type sqlitePieceCompletion struct {
mu sync.Mutex
closed bool
db *sqlite.Conn
}
var _ PieceCompletion = (*sqlitePieceCompletion)(nil)
func NewSqlitePieceCompletion(dir string) (ret *sqlitePieceCompletion, err error) {
p := filepath.Join(dir, ".torrent.db")
db, err := sqlite.OpenConn(p, 0)
if err != nil {
return
}
err = sqlitex.ExecScript(db, `create table if not exists piece_completion(infohash, "index", complete, unique(infohash, "index"))`)
if err != nil {
db.Close()
return
}
ret = &sqlitePieceCompletion{db: db}
return
}
func (me *sqlitePieceCompletion) Get(pk metainfo.PieceKey) (c Completion, err error) {
me.mu.Lock()
defer me.mu.Unlock()
err = sqlitex.Exec(
me.db, `select complete from piece_completion where infohash=? and "index"=?`,
func(stmt *sqlite.Stmt) error {
c.Complete = stmt.ColumnInt(0) != 0
c.Ok = true
return nil
},
pk.InfoHash.HexString(), pk.Index)
return
}
func (me *sqlitePieceCompletion) Set(pk metainfo.PieceKey, b bool) error {
me.mu.Lock()
defer me.mu.Unlock()
if me.closed {
return errors.New("closed")
}
return sqlitex.Exec(
me.db,
`insert or replace into piece_completion(infohash, "index", complete) values(?, ?, ?)`,
nil,
pk.InfoHash.HexString(), pk.Index, b)
}
func (me *sqlitePieceCompletion) Close() (err error) {
me.mu.Lock()
defer me.mu.Unlock()
if me.closed {
return
}
err = me.db.Close()
me.db = nil
me.closed = true
return
}