mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 18:12:46 +00:00
1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
package sqlite3
|
|
|
|
// Backup is an handle to an ongoing online backup operation.
|
|
//
|
|
// https://sqlite.org/c3ref/backup.html
|
|
type Backup struct {
|
|
c *Conn
|
|
handle uint32
|
|
otherc uint32
|
|
}
|
|
|
|
// Backup backs up srcDB on the src connection to the "main" database in dstURI.
|
|
//
|
|
// Backup opens the SQLite database file dstURI,
|
|
// and blocks until the entire backup is complete.
|
|
// Use [Conn.BackupInit] for incremental backup.
|
|
//
|
|
// https://sqlite.org/backup.html
|
|
func (src *Conn) Backup(srcDB, dstURI string) error {
|
|
b, err := src.BackupInit(srcDB, dstURI)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer b.Close()
|
|
_, err = b.Step(-1)
|
|
return err
|
|
}
|
|
|
|
// Restore restores dstDB on the dst connection from the "main" database in srcURI.
|
|
//
|
|
// Restore opens the SQLite database file srcURI,
|
|
// and blocks until the entire restore is complete.
|
|
//
|
|
// https://sqlite.org/backup.html
|
|
func (dst *Conn) Restore(dstDB, srcURI string) error {
|
|
src, err := dst.openDB(srcURI, OPEN_READONLY|OPEN_URI)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b, err := dst.backupInit(dst.handle, dstDB, src, "main")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer b.Close()
|
|
_, err = b.Step(-1)
|
|
return err
|
|
}
|
|
|
|
// BackupInit initializes a backup operation to copy the content of one database into another.
|
|
//
|
|
// BackupInit opens the SQLite database file dstURI,
|
|
// then initializes a backup that copies the contents of srcDB on the src connection
|
|
// to the "main" database in dstURI.
|
|
//
|
|
// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupinit
|
|
func (src *Conn) BackupInit(srcDB, dstURI string) (*Backup, error) {
|
|
dst, err := src.openDB(dstURI, OPEN_READWRITE|OPEN_CREATE|OPEN_URI)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return src.backupInit(dst, "main", src.handle, srcDB)
|
|
}
|
|
|
|
func (c *Conn) backupInit(dst uint32, dstName string, src uint32, srcName string) (*Backup, error) {
|
|
defer c.arena.mark()()
|
|
dstPtr := c.arena.string(dstName)
|
|
srcPtr := c.arena.string(srcName)
|
|
|
|
other := dst
|
|
if c.handle == dst {
|
|
other = src
|
|
}
|
|
|
|
r := c.call("sqlite3_backup_init",
|
|
uint64(dst), uint64(dstPtr),
|
|
uint64(src), uint64(srcPtr))
|
|
if r == 0 {
|
|
defer c.closeDB(other)
|
|
r = c.call("sqlite3_errcode", uint64(dst))
|
|
return nil, c.sqlite.error(r, dst)
|
|
}
|
|
|
|
return &Backup{
|
|
c: c,
|
|
otherc: other,
|
|
handle: uint32(r),
|
|
}, nil
|
|
}
|
|
|
|
// Close finishes a backup operation.
|
|
//
|
|
// It is safe to close a nil, zero or closed Backup.
|
|
//
|
|
// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupfinish
|
|
func (b *Backup) Close() error {
|
|
if b == nil || b.handle == 0 {
|
|
return nil
|
|
}
|
|
|
|
r := b.c.call("sqlite3_backup_finish", uint64(b.handle))
|
|
b.c.closeDB(b.otherc)
|
|
b.handle = 0
|
|
return b.c.error(r)
|
|
}
|
|
|
|
// Step copies up to nPage pages between the source and destination databases.
|
|
// If nPage is negative, all remaining source pages are copied.
|
|
//
|
|
// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupstep
|
|
func (b *Backup) Step(nPage int) (done bool, err error) {
|
|
r := b.c.call("sqlite3_backup_step", uint64(b.handle), uint64(nPage))
|
|
if r == _DONE {
|
|
return true, nil
|
|
}
|
|
return false, b.c.error(r)
|
|
}
|
|
|
|
// Remaining returns the number of pages still to be backed up
|
|
// at the conclusion of the most recent [Backup.Step].
|
|
//
|
|
// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupremaining
|
|
func (b *Backup) Remaining() int {
|
|
r := b.c.call("sqlite3_backup_remaining", uint64(b.handle))
|
|
return int(int32(r))
|
|
}
|
|
|
|
// PageCount returns the total number of pages in the source database
|
|
// at the conclusion of the most recent [Backup.Step].
|
|
//
|
|
// https://sqlite.org/c3ref/backup_finish.html#sqlite3backuppagecount
|
|
func (b *Backup) PageCount() int {
|
|
r := b.c.call("sqlite3_backup_pagecount", uint64(b.handle))
|
|
return int(int32(r))
|
|
}
|