Ein Anderssono
135 lines
2.7 KiB
Go
135 lines
2.7 KiB
Go
package manifest
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import (
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"database/sql"
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"fmt"
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"os"
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"path/filepath"
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_ "modernc.org/sqlite"
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)
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type sqliteManifest struct {
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path string
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db *sql.DB
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open sqlOpenerFunc
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execFunc func(query string, args ...any) (sql.Result, error)
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}
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type sqlOpenerFunc func(driverName, dataSourceName string) (*sql.DB, error)
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var sqliteOpenFunc sqlOpenerFunc
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func defaultSQLOpener() sqlOpenerFunc {
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if sqliteOpenFunc != nil {
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return sqliteOpenFunc
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}
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return sql.Open
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}
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func SQLitePath(dir string) string {
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return filepath.Join(dir, "downloads.db")
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}
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func LoadSQLite(dir string) (*sqliteManifest, error) {
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m := &sqliteManifest{
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path: SQLitePath(dir),
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open: defaultSQLOpener(),
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}
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return m, nil
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}
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func (m *sqliteManifest) OpenAppend() error {
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if m.db != nil {
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return nil
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}
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if err := os.MkdirAll(filepath.Dir(m.path), 0755); err != nil {
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return err
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}
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opener := m.open
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if opener == nil {
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opener = sql.Open
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}
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db, err := opener("sqlite", m.path)
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if err != nil {
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return fmt.Errorf("open sqlite: %w", err)
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}
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execFn := m.execFunc
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if execFn == nil {
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execFn = db.Exec
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}
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_, err = execFn(`CREATE TABLE IF NOT EXISTS downloads (
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id TEXT PRIMARY KEY,
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filename TEXT NOT NULL DEFAULT '',
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size INTEGER NOT NULL DEFAULT 0,
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cloud TEXT NOT NULL DEFAULT '',
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exported INTEGER NOT NULL DEFAULT 0
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)`)
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if err != nil {
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db.Close()
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return fmt.Errorf("create table: %w", err)
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}
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_, err = execFn(`CREATE INDEX IF NOT EXISTS idx_downloads_id ON downloads(id)`)
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if err != nil {
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db.Close()
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return fmt.Errorf("create index: %w", err)
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}
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m.db = db
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return nil
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}
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func (m *sqliteManifest) Has(id string) bool {
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if m.db == nil {
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return false
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}
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var count int
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err := m.db.QueryRow(`SELECT COUNT(*) FROM downloads WHERE id = ?`, id).Scan(&count)
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if err != nil {
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return false
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}
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return count > 0
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}
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func (m *sqliteManifest) Add(id string, filename string, size int64, cloud string) {
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if m.db == nil {
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return
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}
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entry := newEntry(id, filename, size, cloud)
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m.db.Exec(`INSERT OR REPLACE INTO downloads (id, filename, size, cloud, exported) VALUES (?, ?, ?, ?, ?)`,
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id, entry.Filename, entry.Size, entry.Cloud, entry.Exported)
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}
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func (m *sqliteManifest) Save() error {
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return nil
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}
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func (m *sqliteManifest) Close() {
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if m.db != nil {
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m.db.Close()
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m.db = nil
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}
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}
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func (m *sqliteManifest) DB() *sql.DB {
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return m.db
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}
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func (m *sqliteManifest) Entries() map[string]Entry {
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if m.db == nil {
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return nil
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}
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out := make(map[string]Entry)
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rows, err := m.db.Query(`SELECT id, filename, size, cloud, exported FROM downloads`)
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if err != nil {
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return out
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}
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defer rows.Close()
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for rows.Next() {
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var e Entry
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if err := rows.Scan(&e.ID, &e.Filename, &e.Size, &e.Cloud, &e.Exported); err == nil {
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out[e.ID] = e
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}
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}
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return out
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}
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