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Test loading of cached metadata in ngclient

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After making a successful update of valid metadata which stores it
in cache and performing a second update with a new updater while
the metadata is already stored in cache, this test verifies that
timestamp, snaphot and targets are loaded from cache and not
downloaded

Fixes #1681

Signed-off-by: Ivana Atanasova <iyovcheva@vmware.com>
This commit is contained in:
Ivana Atanasova 2021-12-02 11:51:59 +02:00 committed by Ivana Atanasova
parent 3d4df876c2
commit d27c0fd585
1 changed files with 45 additions and 1 deletions
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46
tests/test_updater_top_level_update.py
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@ -12,7 +12,7 @@
import unittest
from datetime import datetime, timedelta
from typing import Iterable, Optional
from unittest.mock import MagicMock, patch
from unittest.mock import MagicMock, call, patch
from tests import utils
from tests.repository_simulator import RepositorySimulator
@ -636,6 +636,50 @@ def test_snapshot_rollback_with_local_snapshot_hash_mismatch(self) -> None:
with self.assertRaises(BadVersionNumberError):
self._run_refresh()
@patch.object(builtins, "open", wraps=builtins.open)
def test_load_metadata_from_cache(self, wrapped_open: MagicMock) -> None:
# Add new delegated targets
spec_version = ".".join(SPECIFICATION_VERSION)
targets = Targets(1, spec_version, self.sim.safe_expiry, {}, None)
role = DelegatedRole("role1", [], 1, False, ["*"], None)
self.sim.add_delegation("targets", role, targets)
self.sim.update_snapshot()
# Make a successful update of valid metadata which stores it in cache
updater = self._run_refresh()
updater.get_targetinfo("non_existent_target")
# Clean up calls to open during refresh()
wrapped_open.reset_mock()
# Clean up fetch tracker metadata
self.sim.fetch_tracker.metadata.clear()
# Create a new updater and perform a second update while
# the metadata is already stored in cache (metadata dir)
updater = Updater(
self.metadata_dir,
"https://example.com/metadata/",
self.targets_dir,
"https://example.com/targets/",
self.sim,
)
updater.get_targetinfo("non_existent_target")
# Test that metadata is loaded from cache and not downloaded
wrapped_open.assert_has_calls(
[
call(os.path.join(self.metadata_dir, "root.json"), "rb"),
call(os.path.join(self.metadata_dir, "timestamp.json"), "rb"),
call(os.path.join(self.metadata_dir, "snapshot.json"), "rb"),
call(os.path.join(self.metadata_dir, "targets.json"), "rb"),
call(os.path.join(self.metadata_dir, "role1.json"), "rb"),
]
)
expected_calls = [("root", 2), ("timestamp", None)]
self.assertListEqual(self.sim.fetch_tracker.metadata, expected_calls)
if __name__ == "__main__":
if "--dump" in sys.argv: