From 88db0eca6d7f6c3b69e27da4557d85eb01e5659c Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Fri, 19 Oct 2018 10:09:18 +0300
Subject: Add: muck/change.py

---
 muck/change.py       | 59 +++++++++++++++++++++++++++++++++
 muck/change_tests.py | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 152 insertions(+)
 create mode 100644 muck/change.py
 create mode 100644 muck/change_tests.py

diff --git a/muck/change.py b/muck/change.py
new file mode 100644
index 0000000..d5a3fd2
--- /dev/null
+++ b/muck/change.py
@@ -0,0 +1,59 @@
+# 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/>.
+
+
+class Change:
+
+    def __init__(self, op, meta, res):
+        self._dict = {
+            'op': op,
+            'meta': meta,
+            'res': res,
+        }
+
+    def as_dict(self):
+        return self._dict
+
+    def get_op(self):
+        return self._dict['op']
+
+    def get_id(self):
+        return self.get_meta()['id']
+
+    def get_rev(self):
+        return self.get_meta()['rev']
+
+    def get_meta(self):
+        return self._dict['meta']
+
+    def get_res(self):
+        return self._dict['res']
+
+
+class CreateChange(Change):
+
+    def __init__(self, meta=None, res=None):
+        super().__init__(op='create', meta=meta, res=res)
+
+
+class UpdateChange(Change):
+
+    def __init__(self, meta=None, res=None):
+        super().__init__(op='update', meta=meta, res=res)
+
+
+class DeleteChange(Change):
+
+    def __init__(self, meta=None, res=None):
+        super().__init__(op='delete', meta=meta, res={})
diff --git a/muck/change_tests.py b/muck/change_tests.py
new file mode 100644
index 0000000..7c1fd34
--- /dev/null
+++ b/muck/change_tests.py
@@ -0,0 +1,93 @@
+# 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 unittest
+
+import muck
+
+
+class ChangeTests(unittest.TestCase):
+
+    meta = {
+        'id': 'id-1',
+        'rev': 'rev-1',
+    }
+
+    res = {
+        'foo': 'bar',
+    }
+
+    def test_generic(self):
+        chg = muck.Change(op='foo', meta=self.meta, res=self.res)
+        self.assertEqual(chg.get_op(), 'foo')
+        self.assertEqual(chg.get_id(), 'id-1')
+        self.assertEqual(chg.get_rev(), 'rev-1')
+        self.assertEqual(chg.get_meta(), self.meta)
+        self.assertEqual(chg.get_res(), self.res)
+        self.assertEqual(
+            chg.as_dict(),
+            {
+                'op': 'foo',
+                'meta': {
+                    'id': 'id-1',
+                    'rev': 'rev-1',
+                },
+                'res': {
+                    'foo': 'bar',
+                },
+            })
+
+    def test_create(self):
+        chg = muck.CreateChange(meta=self.meta, res=self.res)
+        self.assertEqual(
+            chg.as_dict(),
+            {
+                'op': 'create',
+                'meta': {
+                    'id': 'id-1',
+                    'rev': 'rev-1',
+                },
+                'res': {
+                    'foo': 'bar',
+                },
+            })
+
+    def test_update(self):
+        chg = muck.UpdateChange(meta=self.meta, res=self.res)
+        self.assertEqual(
+            chg.as_dict(),
+            {
+                'op': 'update',
+                'meta': {
+                    'id': 'id-1',
+                    'rev': 'rev-1',
+                },
+                'res': {
+                    'foo': 'bar',
+                },
+            })
+
+    def test_delete(self):
+        chg = muck.DeleteChange(meta=self.meta, res=self.res)
+        self.assertEqual(
+            chg.as_dict(),
+            {
+                'op': 'delete',
+                'meta': {
+                    'id': 'id-1',
+                    'rev': 'rev-1',
+                },
+                'res': {},
+            })
-- 
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