Upgrade dbm, implement sqlite3 autocommit #6616
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📝 WalkthroughWalkthroughIntroduces autocommit mode mechanism for sqlite3 connections with three modes (Legacy, Enabled, Disabled), adds public Python-facing autocommit property on Connection and Cursor, exposes LEGACY_TRANSACTION_CONTROL constant, adjusts transaction control flow to respect autocommit state, and improves cleanup safety using sqlite3_close_v2 with early-exit validation for closed connections. Changes
Sequence Diagram(s)sequenceDiagram
participant Client as Client (Python)
participant Conn as Connection
participant Cursor as Cursor
participant SQLite as SQLite DB
alt Autocommit Disabled (Manual)
Client->>Conn: execute(sql)
Conn->>Conn: autocommit check
Conn->>SQLite: BEGIN
Conn->>Cursor: create cursor
Cursor->>SQLite: execute statement
Client->>Conn: commit()
Conn->>SQLite: COMMIT
else Autocommit Enabled
Client->>Conn: execute(sql)
Conn->>Conn: autocommit check
Note over Conn: skip BEGIN
Conn->>Cursor: create cursor
Cursor->>SQLite: execute statement
Note over SQLite: autocommit on DB
else Autocommit Legacy
Client->>Conn: execute(sql)
Conn->>Conn: check LEGACY_TRANSACTION_CONTROL
Conn->>SQLite: BEGIN
Conn->>Cursor: create cursor
Cursor->>SQLite: execute statement
end
Conn->>Conn: close()
Conn->>SQLite: sqlite3_close_v2()
Note over Conn: handles active statements safely
Estimated code review effort🎯 4 (Complex) | ⏱️ ~40 minutes Possibly related PRs
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 3
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Lib/dbm/__init__.pyis excluded by!Lib/**Lib/dbm/dumb.pyis excluded by!Lib/**Lib/dbm/gnu.pyis excluded by!Lib/**Lib/dbm/ndbm.pyis excluded by!Lib/**Lib/dbm/sqlite3.pyis excluded by!Lib/**Lib/test/test_dbm.pyis excluded by!Lib/**Lib/test/test_dbm_dumb.pyis excluded by!Lib/**Lib/test/test_dbm_sqlite3.pyis excluded by!Lib/**
📒 Files selected for processing (1)
crates/stdlib/src/sqlite.rs
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**/*.rs
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
**/*.rs: Follow the default rustfmt code style by runningcargo fmtto format Rust code
Always run clippy to lint code (cargo clippy) before completing tasks and fix any warnings or lints introduced by changes
Follow Rust best practices for error handling and memory management
Use the macro system (pyclass,pymodule,pyfunction, etc.) when implementing Python functionality in Rust
Files:
crates/stdlib/src/sqlite.rs
🔇 Additional comments (9)
crates/stdlib/src/sqlite.rs (9)
305-338: LGTM!The
AutocommitModeenum and itsTryFromBorrowedObjectimplementation are well-designed. The identity checks (obj.is(&vm.ctx.true_value)) correctly distinguish betweenTrue/Falseand integer values, matching CPython's behavior whereautocommit=1is treated differently fromautocommit=True.
360-361: LGTM!The
autocommitfield correctly uses the derivedDefaultimplementation, which initializes toAutocommitMode::Legacy.
883-883: LGTM!The
autocommitfield usesPyMutex<AutocommitMode>for thread-safe access, consistent with other mutable state in theConnectionstruct.
963-970: LGTM!The autocommit mode is correctly extracted from
ConnectArgsand assigned to the connection during reinitialization.
1778-1791: Consistent withexecute()implementation.The autocommit check mirrors the
execute()method. The same verification regardingAutocommitMode::Disabledbehavior applies here.
2018-2030: Good safety improvement for cleanup on closed connections.This early check ensures that when iterating a cursor after the connection is closed, the statement is properly reset to release file locks. The error message is clear and matches CPython's behavior.
Note: There's a theoretical TOCTOU gap between
is_closed()and the lock acquisition, but this is acceptable since:
- Connection closure is typically single-threaded from Python's perspective
- The later
db_lock(vm)call would catch any race condition- This is primarily a best-effort cleanup improvement
1569-1579: AI summary inconsistency: Cursor does not have autocommit property.The AI-generated summary mentions "Added public methods: autocommit (getter) on class Cursor" and "autocommit: PyMutex" in Cursor, but the actual code correctly implements autocommit only at the Connection level. This is the expected behavior since autocommit is a connection-level setting in Python's sqlite3 module.
364-368: LGTM!The
Traverseimplementation forConnectArgscorrectly excludesautocommitsinceAutocommitModeis a simpleCopyenum with no Python object references that need GC traversal.
1683-1696: No changes required—the transaction logic correctly implements CPython behavior.The code correctly handles
AutocommitMode::Disabled(corresponding toautocommit=False). Per PEP-249 and CPython sqlite3 specifications, whenautocommit=False, implicit transactions viaBEGINare required before DML statements, and the user must explicitly callcommit()orrollback(). The term "manual commit mode" refers to requiring explicit commits after the implicit transaction begins, not the absence of implicit transactions.The condition
*zelf.connection.autocommit.lock() != AutocommitMode::Enabledcorrectly:
- Calls
begin_transaction()forDisabledmode (autocommit=False) → implicit transactions as required ✓- Calls
begin_transaction()forLegacymode → respects isolation_level ✓- Skips
begin_transaction()forEnabledmode (autocommit=True) → true SQLite autocommit ✓
for #6483
cc @ever0de
Summary by CodeRabbit
New Features
Bug Fixes
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