Move betterproto → src/betterproto

This change avoids some nasty import issues and also ensures that the
right code is tested and arbitrary code is not included when packaging.

src/betterproto/templates/template.py.j2

@@ -0,0 +1,135 @@
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# sources: {{ ', '.join(description.files) }}
+# plugin: python-betterproto
+from dataclasses import dataclass
+{% if description.datetime_imports %}
+from datetime import {% for i in description.datetime_imports %}{{ i }}{% if not loop.last %}, {% endif %}{% endfor %}
+
+{% endif%}
+{% if description.typing_imports %}
+from typing import {% for i in description.typing_imports %}{{ i }}{% if not loop.last %}, {% endif %}{% endfor %}
+
+{% endif %}
+
+import betterproto
+{% if description.services %}
+import grpclib
+{% endif %}
+
+
+{% if description.enums %}{% for enum in description.enums %}
+class {{ enum.py_name }}(betterproto.Enum):
+    {% if enum.comment %}
+{{ enum.comment }}
+
+    {% endif %}
+    {% for entry in enum.entries %}
+        {% if entry.comment %}
+{{ entry.comment }}
+        {% endif %}
+    {{ entry.name }} = {{ entry.value }}
+    {% endfor %}
+
+
+{% endfor %}
+{% endif %}
+{% for message in description.messages %}
+@dataclass
+class {{ message.py_name }}(betterproto.Message):
+    {% if message.comment %}
+{{ message.comment }}
+
+    {% endif %}
+    {% for field in message.properties %}
+        {% if field.comment %}
+{{ field.comment }}
+        {% endif %}
+    {{ field.py_name }}: {{ field.type }} = betterproto.{{ field.field_type }}_field({{ field.number }}{% if field.field_type == 'map'%}, betterproto.{{ field.map_types[0] }}, betterproto.{{ field.map_types[1] }}{% endif %}{% if field.one_of %}, group="{{ field.one_of }}"{% endif %}{% if field.field_wraps %}, wraps={{ field.field_wraps }}{% endif %})
+    {% endfor %}
+    {% if not message.properties %}
+    pass
+    {% endif %}
+
+
+{% endfor %}
+{% for service in description.services %}
+class {{ service.py_name }}Stub(betterproto.ServiceStub):
+    {% if service.comment %}
+{{ service.comment }}
+
+    {% endif %}
+    {% for method in service.methods %}
+    async def {{ method.py_name }}(self
+        {%- if not method.client_streaming -%}
+            {%- if method.input_message and method.input_message.properties -%}, *,
+                {%- for field in method.input_message.properties -%}
+                    {{ field.py_name }}: {% if field.zero == "None" and not field.type.startswith("Optional[") -%}
+                                            Optional[{{ field.type }}]
+                                         {%- else -%}
+                                            {{ field.type }}
+                                         {%- endif -%} = {{ field.zero }}
+                    {%- if not loop.last %}, {% endif -%}
+                {%- endfor -%}
+            {%- endif -%}
+        {%- else -%}
+            {# Client streaming: need a request iterator instead #}
+            , request_iterator: Union[AsyncIterable["{{ method.input }}"], Iterable["{{ method.input }}"]]
+        {%- endif -%}
+            ) -> {% if method.server_streaming %}AsyncIterator[{{ method.output }}]{% else %}{{ method.output }}{% endif %}:
+        {% if method.comment %}
+{{ method.comment }}
+
+        {% endif %}
+        {% if not method.client_streaming %}
+        request = {{ method.input }}()
+        {% for field in method.input_message.properties %}
+            {% if field.field_type == 'message' %}
+        if {{ field.py_name }} is not None:
+            request.{{ field.py_name }} = {{ field.py_name }}
+            {% else %}
+        request.{{ field.py_name }} = {{ field.py_name }}
+            {% endif %}
+        {% endfor %}
+        {% endif %}
+
+        {% if method.server_streaming %}
+            {% if method.client_streaming %}
+        async for response in self._stream_stream(
+            "{{ method.route }}",
+            request_iterator,
+            {{ method.input }},
+            {{ method.output.strip('"') }},
+        ):
+            yield response
+            {% else %}{# i.e. not client streaming #}
+        async for response in self._unary_stream(
+            "{{ method.route }}",
+            request,
+            {{ method.output.strip('"') }},
+        ):
+            yield response
+
+            {% endif %}{# if client streaming #}
+        {% else %}{# i.e. not server streaming #}
+            {% if method.client_streaming %}
+        return await self._stream_unary(
+            "{{ method.route }}",
+            request_iterator,
+            {{ method.input }},
+            {{ method.output.strip('"') }}
+        )
+            {% else %}{# i.e. not client streaming #}
+        return await self._unary_unary(
+            "{{ method.route }}",
+            request,
+            {{ method.output.strip('"') }}
+        )
+            {% endif %}{# client streaming #}
+        {% endif %}
+
+    {% endfor %}
+{% endfor %}
+
+{% for i in description.imports %}
+{{ i }}
+{% endfor %}