| 1 | """BridgeDatabase — subprocess implementation of pywitdb.Database.""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | from collections.abc import Iterator |
| 6 | from contextlib import contextmanager |
| 7 | |
| 8 | from pywitdb._api import Database |
| 9 | from pywitdb._bridge.client import BridgeClient |
| 10 | from pywitdb.exceptions import WitDbStoreError |
| 11 | |
| 12 | |
| 13 | class BridgeDatabase(Database): |
| 14 | def __init__(self, client: BridgeClient, path: str) -> None: |
| 15 | self._client = client |
| 16 | self._path = path |
| 17 | self._closed = False |
| 18 | |
| 19 | def get(self, key: bytes) -> bytes | None: |
| 20 | resp = self._client.ensure_ok(self._client.request("get", key=BridgeClient.b64(key))) |
| 21 | if not resp.get("found"): |
| 22 | return None |
| 23 | value = resp.get("value") |
| 24 | if not isinstance(value, str): |
| 25 | raise WitDbStoreError("bridge get: missing value") |
| 26 | return BridgeClient.unb64(value) |
| 27 | |
| 28 | def put(self, key: bytes, value: bytes) -> None: |
| 29 | self._client.ensure_ok( |
| 30 | self._client.request( |
| 31 | "put", |
| 32 | key=BridgeClient.b64(key), |
| 33 | value=BridgeClient.b64(value), |
| 34 | ) |
| 35 | ) |
| 36 | |
| 37 | def delete(self, key: bytes) -> bool: |
| 38 | resp = self._client.ensure_ok( |
| 39 | self._client.request("delete", key=BridgeClient.b64(key)) |
| 40 | ) |
| 41 | return bool(resp.get("deleted")) |
| 42 | |
| 43 | @contextmanager |
| 44 | def transaction(self) -> Iterator[None]: |
| 45 | self._client.ensure_ok(self._client.request("txn_begin")) |
| 46 | try: |
| 47 | yield None |
| 48 | self._client.ensure_ok(self._client.request("txn_commit")) |
| 49 | except Exception: |
| 50 | self._client.ensure_ok(self._client.request("txn_rollback")) |
| 51 | raise |
| 52 | |
| 53 | def close(self) -> None: |
| 54 | if self._closed: |
| 55 | return |
| 56 | self._closed = True |
| 57 | self._client.close() |
| 58 | |
| 59 | |
| 60 | def open_bridge( |
| 61 | path: str, |
| 62 | *, |
| 63 | password: str | None = None, |
| 64 | create: bool = True, |
| 65 | ) -> BridgeDatabase: |
| 66 | client = BridgeClient.start() |
| 67 | client.open(path, password=password, create=create) |
| 68 | return BridgeDatabase(client, path) |
| 69 | |