Add basic metadata protos

.flake8

@@ -1,2 +1,3 @@
 [flake8]
 ignore = E501, W503
+exclude = *_pb2.py

mypy.ini

@@ -0,0 +1,7 @@
+[mypy]
+python_version = 3.6
+ignore_missing_imports = True
+
+
+[mypy-synthtool.protos.*]
+ignore_errors = True

noxfile.py

@@ -27,11 +27,18 @@ def lint(session):
     session.run('pip', 'install', '-e', '.')
     session.run('black', '--check', 'synthtool', 'tests')
     session.run('flake8', 'synthtool', 'tests')
-    session.run('mypy', '--ignore-missing-imports', 'synthtool')
+    session.run('mypy', 'synthtool')
 
 
 @nox.session(python='3.6')
 def test(session):
     session.install('pytest')
     session.run('pip', 'install', '-e', '.')
     session.run('pytest', 'tests', *session.posargs)
+
+
+@nox.session(python='3.6')
+def generate_protos(session):
+    session.install("grpcio-tools")
+    session.run(
+        "python", "-m", "grpc_tools.protoc", "-Isynthtool/protos", "--python_out=synthtool/protos", "synthtool/protos/metadata.proto")

setup.py

@@ -24,6 +24,7 @@
     "jinja2",
     "packaging",
     "requests",
+    "protobuf",
 ]
 
 packages = setuptools.find_packages()

synthtool/protos/metadata.proto

@@ -0,0 +1,75 @@
+// 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.
+
+syntax = "proto3";
+
+package yoshi.synth.metadata;
+
+import "google/protobuf/timestamp.proto";
+
+
+message Metadata {
+    google.protobuf.Timestamp update_time = 1;
+
+    repeated Source sources = 2;
+    repeated Destination destinations = 3;
+}
+
+message Source {
+    oneof source {
+        GitSource git = 1;
+        GeneratorSource generator = 2;
+        TemplateSource template = 3;
+    }
+}
+
+message GitSource {
+    string name = 1;
+    string remote = 2;
+    string sha = 3;
+
+    // If this Git is a mirror of an internal repository, such as google3 or
+    // Git-on-Borg, you can include an internal ref to it here.
+    string internal_ref = 4;
+}
+
+message GeneratorSource {
+    string name = 1;
+    string version = 2;
+}
+
+message TemplateSource {
+    string name = 1;
+    string origin = 2;
+    string version = 3;
+}
+
+message Destination {
+    oneof Destination {
+        ClientDestination client = 1;
+        FileSetDestination fileset = 2;
+    }
+}
+
+message ClientDestination {
+    string api_name = 1;
+    string api_version = 2;
+    string generator = 3;
+    string source = 4;
+}
+
+message FileSetDestination {
+    string source = 1;
+    repeated string files = 2;
+}