Milo: pRPC endpoint for getting Buildbot master data

milo/api/proto/buildbot.proto

+// Copyright 2016 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+syntax = "proto3";
+
+package milo;
+
+import "google/protobuf/timestamp.proto";
+
+// The buildbot service definition.
+service Buildbot {
+  rpc GetMaster (MasterRequest) returns (MasterReply) {}

[iannucci, 2016/09/01 00:37:26]

nit: no space between GetMaster and its argument (IMO, YMMV)

Can we call this GetCompressedMasterJSON? I think there's probably room in the
future to return something other than a gzip blob.

[hinoka, 2016/09/03 00:52:27]

Done.

+}
+
+// The request containing the name of the master.
+message MasterRequest {
+  string name = 1;
+}
+
+// The response message containing master information.
+message MasterReply {
+  // Whether the master is internal or not.
+  bool internal = 1;
+
+  // Timestamp of the freshness of the master data.
+  google.protobuf.Timestamp modified = 2;
+
+  // Gzipped json data of the master.

[iannucci, 2016/09/01 00:37:26]

barf :(

+  bytes data = 3;
+}