mirror of https://github.com/nucypher/nucypher.git
131 lines
3.3 KiB
Python
131 lines
3.3 KiB
Python
"""
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This file is part of nucypher.
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nucypher is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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nucypher is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with nucypher. If not, see <https://www.gnu.org/licenses/>.
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"""
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from bisect import bisect_left
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from contextlib import contextmanager
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from pathlib import Path
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import lmdb
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from threading import Lock
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from constant_sorrow.constants import MOCK_DB
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def mock_lmdb_open(db_path: Path, map_size=10485760):
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if db_path == MOCK_DB:
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return MockEnvironment()
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else:
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return lmdb.Environment(str(db_path), map_size=map_size)
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class MockEnvironment:
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def __init__(self):
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self._storage = {}
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self._lock = Lock()
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@contextmanager
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def begin(self, write=False):
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with self._lock:
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with MockTransaction(self, write=write) as tx:
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yield tx
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class MockTransaction:
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def __init__(self, env, write=False):
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self._env = env
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self._storage = dict(env._storage)
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self._write = write
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self._invalid = False
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def __enter__(self):
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if self._invalid:
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raise lmdb.Error()
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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if exc_type:
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self.abort()
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else:
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self.commit()
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def put(self, key, value, overwrite=True):
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if self._invalid:
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raise lmdb.Error()
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assert self._write
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if not overwrite and key in self._storage:
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return False
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self._storage[key] = value
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return True
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def get(self, key, default=None):
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if self._invalid:
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raise lmdb.Error()
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return self._storage.get(key, default)
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def delete(self, key):
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if self._invalid:
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raise lmdb.Error()
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assert self._write
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if key in self._storage:
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del self._storage[key]
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return True
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else:
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return False
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def commit(self):
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if self._invalid:
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raise lmdb.Error()
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self._invalidate()
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self._env._storage = self._storage
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def abort(self):
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self._invalidate()
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self._storage = self._env._storage
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def _invalidate(self):
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self._invalid = True
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def cursor(self):
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return MockCursor(self)
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class MockCursor:
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def __init__(self, tx):
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self._tx = tx
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# TODO: assuming here that the keys are not changed while the cursor exists.
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# Any way to enforce it?
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self._keys = list(sorted(tx._storage))
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self._pos = None
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def set_range(self, key):
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pos = bisect_left(self._keys, key)
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if pos == len(self._keys):
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self._pos = None
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return False
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else:
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self._pos = pos
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return True
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def key(self):
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return self._keys[self._pos]
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def iternext(self, keys=True, values=True):
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return iter(self._keys[self._pos:])
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