Successfully import under Bazel

tools/distrib/python/grpcio_tools/grpc_tools/BUILD

@@ -0,0 +1,38 @@
+# TODO(rbellevi): Fix this wide-open visibility.
+package(default_visibility = ["//visibility:public"])
+
+load("//bazel:cython_library.bzl", "pyx_library")
+
+cc_library(
+    # TODO: Better name?
+    name = "protoc_lib",
+    srcs = ["main.cc"],
+    hdrs = ["main.h"],
+    deps = [
+      "@com_google_protobuf//:protoc_lib",
+      # I really wish there were a disaggregated target to use here.
+      "//src/compiler:grpc_plugin_support",
+    ],
+)
+
+pyx_library(
+    name = "cyprotoc",
+    srcs = ["_protoc_compiler.pyx"],
+    deps = [":protoc_lib"],
+)
+
+py_library(
+    name = "grpc_tools",
+    srcs = ["__init__.py", "protoc.py"],
+    deps = [":cyprotoc"],
+    # TODO: Think about whether we should include well-known protos.
+    srcs_version = "PY2AND3",
+    imports = ["../"],
+)
+
+py_test(
+  name = "protoc_test",
+  srcs = ["protoc_test.py"],
+  deps = ["//tools/distrib/python/grpcio_tools/grpc_tools:grpc_tools"],
+  python_version = "PY2",
+)

tools/distrib/python/grpcio_tools/grpc_tools/_protoc_compiler.pyx

@@ -14,7 +14,8 @@
 
 from libc cimport stdlib
 
-cdef extern from "grpc_tools/main.h":
+# TODO: Make this build system agnostic.
+cdef extern from "tools/distrib/python/grpcio_tools/grpc_tools/main.h":
   int protoc_main(int argc, char *argv[])
 
 def run_main(list args not None):

tools/distrib/python/grpcio_tools/grpc_tools/main.cc

@@ -17,7 +17,8 @@
 
 #include "src/compiler/python_generator.h"
 
-#include "grpc_tools/main.h"
+// TODO: Make this include agnostic to build system.
+#include "tools/distrib/python/grpcio_tools/grpc_tools/main.h"
 
 int protoc_main(int argc, char* argv[]) {
   google::protobuf::compiler::CommandLineInterface cli;

tools/distrib/python/grpcio_tools/grpc_tools/protoc_test.py

@@ -0,0 +1,19 @@
+"""Tests for protoc."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import unittest
+import grpc_tools
+from grpc_tools import protoc
+
+
+class ProtocTest(unittest.TestCase):
+
+  def test_protoc(self):
+      pass
+
+
+if __name__ == '__main__':
+    unittest.main()