gecko-dev/storage/rust
Lina Cambridge 38a1672309 Bug 1613835 - Use a SQLite API call to check for in-progress transactions. r=mak
Previously, `mozIStorageConnection#transactionInProgress` returned true
only if a transaction was started via `beginTransaction()`. This meant
that manually executing `BEGIN`, as `Sqlite.jsm` and the Rust bindings
do, wouldn't accurately report if a transaction was in progress.
Similarly, the flag wasn't accurate in cases where SQLite automatically
rolled back a transaction.

Fortunately, SQLite provides the `sqlite3_get_autocommit()` function,
which we can use to determine if a transaction is open or not. This
commit refactors the `transactionInProgress` getter, along with all
`Connection` methods that depend on it, to use the SQLite API instead
of managing that state on the connection. `mozStorageTransaction` and
`Sqlite.jsm` still use their own flags to decide whether to commit
their transactions, for reasons explained in the IDL comment.

This commit also moves `transactionInProgress` to
`mozIStorageAsyncConnection`, so that `Sqlite.jsm` can use it, and
exposes it to Rust.

Differential Revision: https://phabricator.services.mozilla.com/D63732

--HG--
extra : moz-landing-system : lando
2020-03-03 22:57:39 +00:00
..
src Bug 1613835 - Use a SQLite API call to check for in-progress transactions. r=mak 2020-03-03 22:57:39 +00:00
Cargo.toml