mirror of
https://github.com/kuhyx/utils.git
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156 lines
5.3 KiB
Python
156 lines
5.3 KiB
Python
"""Cache-then-network-then-stale-cache, and the toolchain routing.
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The third step is the one that matters: serving an *expired* entry when the
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network is gone is what keeps the pre-commit hook from cornering a user who is
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forbidden from passing `--no-verify`.
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"""
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from __future__ import annotations
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import time
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from pathlib import Path
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import pytest
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from dep_freshness._tables import TTL_SECONDS
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from dep_freshness.cache import Cache, Entry, ttl_for
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from dep_freshness.models import Dep
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from dep_freshness.registries import http
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from dep_freshness.registries import toolchain as tc
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from dep_freshness.resolve import Resolver, _toolchain_latest
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def dep(ecosystem="pub", name="http") -> Dep:
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return Dep(ecosystem=ecosystem, name=name, constraint="1.0.0",
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path=Path("pubspec.yaml"), line=1, pinned="1.0.0")
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@pytest.fixture
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def resolver(cache_dir):
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return Resolver(cache=Cache(cache_dir / "registry.json"))
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def test_a_fresh_cache_entry_short_circuits_the_network(resolver, monkeypatch):
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resolver.cache.put("pub", "http", "1.6.0")
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monkeypatch.setattr("dep_freshness.resolve._fetch", _explode)
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assert resolver.latest(dep()).version == "1.6.0"
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def test_a_cold_cache_fetches_and_stores(resolver, monkeypatch):
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monkeypatch.setattr("dep_freshness.resolve._fetch", lambda *_a: "1.6.0")
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assert resolver.latest(dep()).version == "1.6.0"
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assert resolver.cache.get("pub", "http").version == "1.6.0"
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def test_an_expired_entry_is_served_when_the_network_is_gone(resolver, monkeypatch):
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resolver.cache.put("pub", "http", "1.6.0")
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stale = time.time() - ttl_for("pub") - 60
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resolver.cache._data["pub/http"]["fetched_at"] = stale
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monkeypatch.setattr("dep_freshness.resolve._fetch", _offline)
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answer = resolver.latest(dep())
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assert answer.version == "1.6.0"
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assert answer.stale_cache_days is not None
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assert not answer.unavailable
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def test_no_cache_and_no_network_is_unavailable(resolver, monkeypatch):
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monkeypatch.setattr("dep_freshness.resolve._fetch", _offline)
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assert resolver.latest(dep()).unavailable
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def test_prefetch_records_why_a_lookup_degraded(resolver, monkeypatch):
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monkeypatch.setattr("dep_freshness.resolve._fetch", _offline)
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resolver.prefetch([dep()])
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assert resolver.degraded
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def test_prefetch_survives_an_unexpected_error(resolver, monkeypatch):
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monkeypatch.setattr("dep_freshness.resolve._fetch", _explode)
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resolver.prefetch([dep()])
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assert any("boom" in reason for reason in resolver.degraded)
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def test_prefetch_skips_packages_already_fresh(resolver, monkeypatch):
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resolver.cache.put("pub", "http", "1.6.0")
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monkeypatch.setattr("dep_freshness.resolve._fetch", _explode)
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resolver.prefetch([dep()])
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assert resolver.degraded == []
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def test_refresh_discards_the_existing_cache(cache_dir, monkeypatch):
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seeded = Cache(cache_dir / "registry.json")
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seeded.put("pub", "http", "1.5.0")
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seeded.save()
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monkeypatch.setattr("dep_freshness.resolve._fetch", lambda *_a: "1.6.0")
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resolver = Resolver(cache=Cache(cache_dir / "registry.json"), refresh=True)
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assert resolver.latest(dep()).version == "1.6.0"
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def test_git_tags_get_a_longer_ttl_than_registries():
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assert ttl_for("gittag") > ttl_for("pub")
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def test_a_corrupt_cache_file_reads_as_a_cold_cache(cache_dir):
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path = cache_dir / "registry.json"
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text("{not json", encoding="utf-8")
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assert Cache(path).get("pub", "http") is None
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def test_a_malformed_cache_entry_is_ignored(cache_dir):
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cache = Cache(cache_dir / "registry.json")
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cache._data["pub/http"] = {"version": "1.6.0"} # no fetched_at
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assert cache.get("pub", "http") is None
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def test_saving_is_a_no_op_when_nothing_changed(cache_dir):
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cache = Cache(cache_dir / "registry.json")
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cache.save()
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assert not (cache_dir / "registry.json").exists()
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def test_an_unwritable_cache_slows_the_next_run_but_does_not_fail_it(tmp_path):
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blocked = tmp_path / "afile"
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blocked.write_text("x", encoding="utf-8")
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cache = Cache(blocked / "registry.json")
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cache.put("pub", "http", "1.6.0")
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cache.save() # must not raise
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def test_entry_age_is_measured_from_fetch_time():
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assert Entry("1.0.0", time.time() - 120).age() >= 120
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@pytest.mark.parametrize("name,expected", [
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("flutter", "3.47.2"), ("dart", "3.13.2"), ("node", "24.20.0"),
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])
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def test_toolchain_routing(monkeypatch, name, expected):
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monkeypatch.setattr(tc, "flutter_latest", lambda: ("3.47.2", "3.13.2"))
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monkeypatch.setattr(tc, "node_latest", lambda: "24.20.0")
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assert _toolchain_latest(name) == expected
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def test_an_unknown_toolchain_has_no_target():
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assert _toolchain_latest("go") is None
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def _offline(*_args):
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raise http.Offline("no network")
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def _explode(*_args):
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raise RuntimeError("boom")
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def test_ttl_env_overrides_the_registry_ttl(monkeypatch) -> None:
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"""A repo can stretch the refresh window (once-a-day pre-push gates)."""
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monkeypatch.setenv("DEP_FRESHNESS_TTL_SECONDS", "86400")
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assert ttl_for("npm") == 86400
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assert ttl_for("gittag") == 86400
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def test_ttl_env_garbage_falls_back_to_the_default(monkeypatch) -> None:
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"""A malformed value must never break a commit hook."""
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monkeypatch.setenv("DEP_FRESHNESS_TTL_SECONDS", "soon")
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assert ttl_for("npm") == TTL_SECONDS
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