add full DurableClientConverter class

Author: hallvictoria

azure/functions/durable_functions.py

@@ -133,3 +133,62 @@ class DurableClientConverter(meta.InConverter,
     @classmethod
     def has_implicit_output(cls) -> bool:
         return False
+
+    @classmethod
+    def has_trigger_support(cls) -> bool:
+        return False
+
+    @classmethod
+    def check_input_type_annotation(cls, pytype: type) -> bool:
+        return issubclass(pytype, (str, bytes))
+
+    @classmethod
+    def check_output_type_annotation(cls, pytype: type) -> bool:
+        return issubclass(pytype, (str, bytes, bytearray))
+
+    @classmethod
+    def encode(cls, obj: typing.Any, *,
+               expected_type: typing.Optional[type]) -> meta.Datum:
+        if isinstance(obj, str):
+            return meta.Datum(type='string', value=obj)
+
+        elif isinstance(obj, (bytes, bytearray)):
+            return meta.Datum(type='bytes', value=bytes(obj))
+        elif obj is None:
+            return meta.Datum(type=None, value=obj)
+        elif isinstance(obj, dict):
+            return meta.Datum(type='dict', value=obj)
+        elif isinstance(obj, list):
+            return meta.Datum(type='list', value=obj)
+        elif isinstance(obj, int):
+            return meta.Datum(type='int', value=obj)
+        elif isinstance(obj, float):
+            return meta.Datum(type='double', value=obj)
+        elif isinstance(obj, bool):
+            return meta.Datum(type='bool', value=obj)
+        else:
+            raise NotImplementedError
+
+    @classmethod
+    def decode(cls, data: meta.Datum, *, trigger_metadata) -> typing.Any:
+        # Enabling support for Dapr bindings
+        # https://github.com/Azure/azure-functions-python-worker/issues/1316
+        if data is None:
+            return None
+        data_type = data.type
+
+        if data_type == 'string':
+            result = data.value
+        elif data_type == 'bytes':
+            result = data.value
+        elif data_type == 'json':
+            result = data.value
+        elif data_type is None:
+            result = None
+        else:
+            raise ValueError(
+                'unexpected type of data received for the "generic" binding ',
+                repr(data_type)
+            )
+
+        return result

tests/test_durable_functions.py

@@ -270,3 +270,77 @@ def test_enitity_trigger_converter_encode(self):
 
         self.assertEqual(result.type, "json")
         self.assertEqual(result.python_value, {'dummy_key': 'dummy_value'})
+
+    def test_durable_client_converter_has_trigger_support(self):
+        self.assertFalse(DurableClientConverter.has_trigger_support())
+
+    def test_durable_client_converter_check_input_type_annotation(self):
+        self.assertTrue(DurableClientConverter.check_input_type_annotation(str))
+        self.assertTrue(DurableClientConverter.check_input_type_annotation(bytes))
+        self.assertFalse(DurableClientConverter.check_input_type_annotation(int))
+
+    def test_durable_client_converter_check_output_type_annotation(self):
+        self.assertTrue(DurableClientConverter.check_output_type_annotation(str))
+        self.assertTrue(DurableClientConverter.check_output_type_annotation(bytes))
+        self.assertTrue(DurableClientConverter.check_output_type_annotation(bytearray))
+        self.assertFalse(DurableClientConverter.check_output_type_annotation(int))
+
+    def test_durable_client_converter_encode(self):
+        datum = DurableClientConverter.encode("hello")
+        self.assertEqual(datum.type, "string")
+        self.assertEqual(datum.value, "hello")
+
+        datum = DurableClientConverter.encode(b"data")
+        self.assertEqual(datum.type, "bytes")
+        self.assertEqual(datum.value, b"data")
+
+        datum = DurableClientConverter.encode(None)
+        self.assertIsNone(datum.type)
+        self.assertIsNone(datum.value)
+
+        datum = DurableClientConverter.encode({"a": 1})
+        self.assertEqual(datum.type, "dict")
+        self.assertEqual(datum.value, {"a": 1})
+
+        datum = DurableClientConverter.encode([1, 2])
+        self.assertEqual(datum.type, "list")
+        self.assertEqual(datum.value, [1, 2])
+
+        datum = DurableClientConverter.encode(42)
+        self.assertEqual(datum.type, "int")
+        self.assertEqual(datum.value, 42)
+
+        datum = DurableClientConverter.encode(3.14)
+        self.assertEqual(datum.type, "double")
+        self.assertEqual(datum.value, 3.14)
+
+        datum = DurableClientConverter.encode(True)
+        self.assertEqual(datum.type, "bool")
+        self.assertTrue(datum.value)
+
+        with self.assertRaises(NotImplementedError):
+            DurableClientConverter.encode(set([1, 2]))
+
+    def test_durable_client_converter_decode(self):
+        data = Datum(type="string", value="abc")
+        result = DurableClientConverter.decode(data, trigger_metadata=None)
+        self.assertEqual(result, "abc")
+
+        data = Datum(type="bytes", value=b"123")
+        result = DurableClientConverter.decode(data, trigger_metadata=None)
+        self.assertEqual(result, b"123")
+
+        data = Datum(type="json", value={"key": "val"})
+        result = DurableClientConverter.decode(data, trigger_metadata=None)
+        self.assertEqual(result, {"key": "val"})
+
+        data = Datum(type=None, value=None)
+        result = DurableClientConverter.decode(data, trigger_metadata=None)
+        self.assertIsNone(result)
+
+        result = DurableClientConverter.decode(None, trigger_metadata=None)
+        self.assertIsNone(result)
+
+        data = Datum(type="weird", value="???")
+        with self.assertRaises(ValueError):
+            DurableClientConverter.decode(data, trigger_metadata=None)