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author | Lars Wirzenius <liw@liw.fi> | 2018-10-19 20:00:56 +0300 |
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committer | Lars Wirzenius <liw@liw.fi> | 2018-10-19 20:27:00 +0300 |
commit | 5b3fbd3befbb037186bbfa5b901cc2ded3cd43b2 (patch) | |
tree | c475add9d23b83462fa6db690148ce87f268c4cc | |
parent | f38fb52b956762c80e27a0054b370391e943eeab (diff) | |
download | muck-poc-5b3fbd3befbb037186bbfa5b901cc2ded3cd43b2.tar.gz |
Add: PersistentStore
-rw-r--r-- | muck/__init__.py | 1 | ||||
-rw-r--r-- | muck/pers.py | 55 | ||||
-rw-r--r-- | muck/pers_tests.py | 54 |
3 files changed, 110 insertions, 0 deletions
diff --git a/muck/__init__.py b/muck/__init__.py index 5e20126..69831f1 100644 --- a/muck/__init__.py +++ b/muck/__init__.py @@ -22,3 +22,4 @@ from .change import ( create_change_from_log_entry, ) from .mem import MemoryStore +from .pers import PersistentStore diff --git a/muck/pers.py b/muck/pers.py new file mode 100644 index 0000000..aa4f4c1 --- /dev/null +++ b/muck/pers.py @@ -0,0 +1,55 @@ +# Copyright (C) 2018 Lars Wirzenius +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + + +import json +import os + +import muck + + +class PersistentStore: + + def __init__(self, dirname): + self._dirname = dirname + self._log = ChangeLogWriter(self._changelog_filename()) + + def _changelog_filename(self): + return os.path.join(self._dirname, 'changelog') + + def append_change(self, chg): + self._log.append(chg) + + def load_memory_store(self): + ms = muck.MemoryStore() + for chg in self._changelog_reader(): + ms.change(chg) + return ms + + def _changelog_reader(self): + with open(self._changelog_filename()) as f: + for line in f: + entry = json.loads(line.strip()) + yield muck.create_change_from_log_entry(entry) + + +class ChangeLogWriter: + + def __init__(self, filename): + mode = os.O_WRONLY | os.O_APPEND | os.O_CREAT + self._fd = os.open(filename, mode, 0o666) + + def append(self, chg): + line = json.dumps(chg.as_dict()) + os.write(self._fd, line.encode('UTF-8')) diff --git a/muck/pers_tests.py b/muck/pers_tests.py new file mode 100644 index 0000000..69a1023 --- /dev/null +++ b/muck/pers_tests.py @@ -0,0 +1,54 @@ +# Copyright (C) 2018 Lars Wirzenius +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + + +import shutil +import tempfile +import unittest + +import muck + + +class PersistentStoreTests(unittest.TestCase): + + def setUp(self): + self.tempdir = tempfile.mkdtemp() + self.ps = muck.PersistentStore(self.tempdir) + + def tearDown(self): + shutil.rmtree(self.tempdir) + + def test_initially_loads_empty_memory_store(self): + ms = self.ps.load_memory_store() + self.assertEqual(len(ms), 0) + + def test_appends_to_change_log(self): + meta = { + 'id': 'id-1', + 'rev': 'rev-1', + } + res = { + 'foo': 'bar', + } + + chg = muck.CreateChange(meta, res) + self.ps.append_change(chg) + + ms = self.ps.load_memory_store() + self.assertEqual(len(ms), 1) + self.assertEqual( + ms.as_dict(), + { + 'id-1': (meta, res), + }) |