added client side interceptors (#308)

pkg/intercept/interceptors.go

@@ -0,0 +1,17 @@
+// Package intercept provides gRPC interceptors for MOCStack clients.
+package intercept
+
+import (
+	"context"
+
+	"github.com/microsoft/moc/pkg/errors"
+	"google.golang.org/grpc"
+)
+
+// NewErrorParsingInterceptor transforms grpc errors to moc errors
+func NewErrorParsingInterceptor() grpc.UnaryClientInterceptor {
+	return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+		err := invoker(ctx, method, req, reply, cc, opts...)
+		return errors.ParseGRPCError(err)
+	}
+}