moves plugin proxy to plugin package

pkg/plugins/datasource/tsdb/interface.go

@@ -0,0 +1,27 @@
+package tsdb
+
+import (
+	"golang.org/x/net/context"
+
+	proto "github.com/grafana/grafana/pkg/tsdb/models"
+	plugin "github.com/hashicorp/go-plugin"
+	"google.golang.org/grpc"
+)
+
+type TsdbPlugin interface {
+	Query(ctx context.Context, req *proto.TsdbQuery) (*proto.Response, error)
+}
+
+type TsdbPluginImpl struct {
+	plugin.NetRPCUnsupportedPlugin
+	Plugin TsdbPlugin
+}
+
+func (p *TsdbPluginImpl) GRPCServer(s *grpc.Server) error {
+	proto.RegisterTsdbPluginServer(s, &GRPCServer{p.Plugin})
+	return nil
+}
+
+func (p *TsdbPluginImpl) GRPCClient(c *grpc.ClientConn) (interface{}, error) {
+	return &GRPCClient{proto.NewTsdbPluginClient(c)}, nil
+}