structure saas with tools

.venv/lib/python3.10/site-packages/proto/marshal/collections/maps.py

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+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import collections
+
+from proto.utils import cached_property
+from google.protobuf.message import Message
+
+
+class MapComposite(collections.abc.MutableMapping):
+    """A view around a mutable sequence in protocol buffers.
+
+    This implements the full Python MutableMapping interface, but all methods
+    modify the underlying field container directly.
+    """
+
+    @cached_property
+    def _pb_type(self):
+        """Return the protocol buffer type for this sequence."""
+        # Huzzah, another hack. Still less bad than RepeatedComposite.
+        return type(self.pb.GetEntryClass()().value)
+
+    def __init__(self, sequence, *, marshal):
+        """Initialize a wrapper around a protobuf map.
+
+        Args:
+            sequence: A protocol buffers map.
+            marshal (~.MarshalRegistry): An instantiated marshal, used to
+                convert values going to and from this map.
+        """
+        self._pb = sequence
+        self._marshal = marshal
+
+    def __contains__(self, key):
+        # Protocol buffers is so permissive that querying for the existence
+        # of a key will in of itself create it.
+        #
+        # By taking a tuple of the keys and querying that, we avoid sending
+        # the lookup to protocol buffers and therefore avoid creating the key.
+        return key in tuple(self.keys())
+
+    def __getitem__(self, key):
+        # We handle raising KeyError ourselves, because otherwise protocol
+        # buffers will create the key if it does not exist.
+        if key not in self:
+            raise KeyError(key)
+        return self._marshal.to_python(self._pb_type, self.pb[key])
+
+    def __setitem__(self, key, value):
+        pb_value = self._marshal.to_proto(self._pb_type, value, strict=True)
+        # Directly setting a key is not allowed; however, protocol buffers
+        # is so permissive that querying for the existence of a key will in
+        # of itself create it.
+        #
+        # Therefore, we create a key that way (clearing any fields that may
+        # be set) and then merge in our values.
+        self.pb[key].Clear()
+        self.pb[key].MergeFrom(pb_value)
+
+    def __delitem__(self, key):
+        self.pb.pop(key)
+
+    def __len__(self):
+        return len(self.pb)
+
+    def __iter__(self):
+        return iter(self.pb)
+
+    @property
+    def pb(self):
+        return self._pb