Tests for rich logging, apply ruff formatting

tests/test_logheader.py

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+import logging
+
+import pytest
+
+from kanta import Kanta
+from kanta.callbacks import DictPost, DictPre
+
+from .support import Data, make_kanta, read_changes
+
+
+def test_logheader_rejects_async(tmp_path, format_config):
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    with pytest.raises(TypeError, match="must not be async"):
+
+        @kanta.logheader
+        async def header(action: str) -> str:
+            return action
+
+
+def test_logheader_rejects_bad_return_annotation(tmp_path, format_config):
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    with pytest.raises(TypeError, match="must return"):
+
+        @kanta.logheader
+        def header(action: str) -> int:
+            return 1
+
+
+def test_logheader_rejects_unknown_annotation(tmp_path, format_config):
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    with pytest.raises(TypeError, match="unsupported annotation"):
+
+        @kanta.logheader
+        def header(action: str, bogus: int) -> str:
+            return action
+
+
+@pytest.mark.asyncio
+async def test_logheader_replaces_default_header(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    @kanta.logheader
+    def header(action: str, user: str | None, extra: dict | None) -> str:
+        return f"HDR {action} user={user} session={extra['session']}"
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="update", user="alice", extra={"session": 3}) as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "HDR update user=alice session=3" in caplog.text
+    # The diff body is still logged after the custom header.
+    assert "counter" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_default_target_is_filename(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "mydb.db", Data, format_config)
+
+    @kanta.logheader
+    def header(action: str, extra: dict | None) -> str:
+        return f"target={extra['target']}"
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="update") as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "target=mydb.db" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_explicit_target_kept(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "mydb.db", Data, format_config)
+
+    @kanta.logheader
+    def header(action: str, extra: dict | None) -> str:
+        return f"target={extra['target']}"
+
+    await kanta.open(log=False)
+    with kanta.transaction(
+        action="update", extra={"target": "Project X (abcd1234)"}
+    ) as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "target=Project X (abcd1234)" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_injects_states_and_kanta(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    @kanta.logheader
+    def header(
+        action: str,
+        previous: DictPre,
+        current: DictPost,
+        kanta: Kanta,
+    ) -> str:
+        return (
+            f"{action} counter {previous.get('counter')}"
+            f" -> {current.get('counter')} db={kanta.filename.name}"
+        )
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="increment") as data:
+        data.counter = 5
+    await kanta.close()
+
+    assert "increment counter 0 -> 5 db=test.db" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_chain_first_non_none_wins(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    @kanta.logheader
+    def first(action: str) -> str | None:
+        return None
+
+    @kanta.logheader
+    def second(action: str) -> str:
+        return f"SECOND {action}"
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="update") as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "SECOND update" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_all_none_falls_back_to_default(
+    tmp_path, format_config, caplog
+):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    @kanta.logheader
+    def header(action: str) -> str | None:
+        return None
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="update", user="alice") as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "update" in caplog.text
+    assert "alice" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_receives_formatted_user(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    @kanta.logfmt(path="$user")
+    def resolve_user(value: str) -> str | None:
+        return "Alice"
+
+    @kanta.logheader
+    def header(action: str, user: str | None) -> str:
+        return f"actor={user}"
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="update", user="uuid-1") as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "actor=Alice" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_logheader_applies_to_bootstrap(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.bootstrap")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    @kanta.logheader
+    def header(action: str, extra: dict | None) -> str:
+        return f"BOOT {action} target={extra['target']}"
+
+    await kanta.open()
+    await kanta.close()
+
+    assert "BOOT bootstrap target=test.db" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_transaction_extra_string_in_default_header(
+    tmp_path, format_config, caplog
+):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    await kanta.open(log=False)
+    with kanta.transaction(action="export", extra="mydb.db") as data:
+        data.counter = 1
+    await kanta.close()
+
+    assert "export" in caplog.text
+    assert "mydb.db" in caplog.text
+
+
+@pytest.mark.asyncio
+async def test_extra_is_not_persisted(tmp_path, format_config):
+    path = tmp_path / "test.db"
+    kanta = make_kanta(path, Data, format_config)
+
+    await kanta.open(log=False)
+    with kanta.transaction(
+        action="update", user="alice", extra={"session": 3, "target": "X"}
+    ) as data:
+        data.counter = 1
+    await kanta.close()
+
+    record = read_changes(path, format_config)[-1]
+    assert record.a == "update"
+    assert record.u == "alice"
+
+
+@pytest.mark.asyncio
+async def test_transaction_log_dict_toggles(tmp_path, format_config, caplog):
+    caplog.set_level(logging.INFO, logger="kanta.transaction")
+    kanta = make_kanta(tmp_path / "test.db", Data, format_config)
+
+    await kanta.open(log=False)
+    with kanta.transaction(
+        action="myaction", log={"header": True, "diff": False}
+    ) as data:
+        data.counter = 1
+    with kanta.transaction(
+        action="otheraction", log={"header": False, "diff": True}
+    ) as data:
+        data.counter = 2
+    await kanta.close()
+
+    # First transaction: header only.
+    assert "myaction" in caplog.text
+    # Second transaction: diff only, no header.
+    assert "otheraction" not in caplog.text
+    assert "counter" in caplog.text