Milo: pRPC endpoint for getting Buildbot master data

milo/appengine/buildbot/grpc.go

Index: milo/appengine/buildbot/grpc.go
diff --git a/milo/appengine/buildbot/grpc.go b/milo/appengine/buildbot/grpc.go
new file mode 100644
index 0000000000000000000000000000000000000000..e6518bfc97a0c3ba36cdd009bb1d6885daa74604
--- /dev/null
+++ b/milo/appengine/buildbot/grpc.go
@@ -0,0 +1,44 @@
+// 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.
+
+package buildbot
+
+import (
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+
+	"github.com/luci/luci-go/common/proto/google"
+	milo "github.com/luci/luci-go/milo/api/proto"
+	"golang.org/x/net/context"
+)
+
+type BuildbotService struct{}
+
+var errNotFoundGRPC = grpc.Errorf(codes.NotFound, "Master Not Found")
+
+func (s *BuildbotService) GetMaster(
+	c context.Context, req *milo.MasterRequest) (*milo.MasterReply, error) {
+
+	if req.Name == "" {
+		return nil, grpc.Errorf(codes.InvalidArgument, "No master specified")
+	}
+
+	entry, err := getMasterEntry(c, req.Name)
+	switch {
+	case err == errMasterNotFound:
+		return nil, errNotFoundGRPC
+
+	case err != nil:
+		return nil, err
+	}
+
+	return &milo.MasterReply{
+		Internal: entry.Internal,
+		Modified: &google.Timestamp{
+			Seconds: entry.Modified.Unix(),
+			Nanos:   int32(entry.Modified.Nanosecond()),
+		},
+		Data: entry.Data,
+	}, nil
+}