KeelrLeek
9f0601027c
Everything written this session that has not been through the device: rounds 43 to 48 (each patch adversarially verified, 43's transient-notice expectation fixed), a partial round 49, the pipeline scripts, the Android Auto design and the icon comparison mock. Also the two harness changes that were never A/B'd — adaptive waits, which may only shorten a declared wait and never lengthen it, and a ship that runs the mock walk and the deploy at the same time. The A/B and its 255-step baseline are in handoff/tools; main stays at what the phone has actually walked.
33 lines
1.5 KiB
Plaintext
33 lines
1.5 KiB
Plaintext
/// Open an EXISTING database without writing a byte to it.
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///
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/// [`Library::open`] cannot be used from a process that does not own the
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/// library: it runs `PRAGMA journal_mode = WAL` and a batch of
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/// `CREATE TABLE IF NOT EXISTS`, both writes, and on Android it may be
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/// racing the real app. Android Auto browses and plays from a
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/// service-started process with no Activity in it, and this is the door
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/// it uses.
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///
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/// A read-only open of a WAL database is legal from SQLite 3.22 (this
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/// tree bundles 3.46) as long as the `-shm` and `-wal` files exist and
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/// are readable, OR there is write permission on the DIRECTORY holding
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/// the database. The second always holds for us — the reader is the
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/// app's own uid and owns `…/Library/.soulstream/` — which is why this
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/// works even though `journal_mode=WAL` is persistent and every
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/// SoulStream database is in it.
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///
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/// `NO_MUTEX` because the connection is behind this struct's own
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/// `Mutex`; `URI` because the default flags carry it and dropping it
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/// would quietly change how a path with a `?` in it is read.
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pub fn open_read_only(db_path: &Path) -> Result<Library> {
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let conn = Connection::open_with_flags(
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db_path,
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rusqlite::OpenFlags::SQLITE_OPEN_READ_ONLY
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| rusqlite::OpenFlags::SQLITE_OPEN_NO_MUTEX
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| rusqlite::OpenFlags::SQLITE_OPEN_URI,
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)?;
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Ok(Library {
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conn: Mutex::new(conn),
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})
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}
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