[Core][Bug] Move generated packages into skywalking namespace (#72)

The current version generates codes from proto files into a global namespace, which causes failure when there is a package in the users' application whose name is the same as the generated one, this patch moves the generated codes into the `skywalking` module and thus avoid conflicts.

Resolves apache/skywalking#5406

Author: kezhenxu94

.gitignore

@@ -10,3 +10,4 @@ dist/
 /apache_skywalking.egg-info/
 **/venv/
 tests/**/requirements.txt
+skywalking/protocol

MANIFEST.in

@@ -27,13 +27,7 @@ setup-test: setup
 
 gen:
 	python3 -m grpc_tools.protoc --version || python3 -m pip install grpcio-tools
-	python3 -m grpc_tools.protoc -I protocol --python_out=. --grpc_python_out=. protocol/**/*.proto
-	touch browser/__init__.py
-	touch common/__init__.py
-	touch language_agent/__init__.py
-	touch management/__init__.py
-	touch profile/__init__.py
-	touch service_mesh_probe/__init__.py
+	python3 tools/codegen.py
 
 lint: clean
 	flake8 --version || python3 -m pip install flake8
@@ -59,10 +53,11 @@ upload: package
 	twine upload dist/*
 
 clean:
-	rm -rf browser common language_agent management profile service_mesh_probe
-	rm -rf skywalking_python.egg-info dist build
+	rm -rf skywalking/protocol
+	rm -rf apache_skywalking.egg-info dist build
 	rm -rf skywalking-python*.tgz*
 	find . -name "__pycache__" -exec rm -r {} +
+	find . -name ".pytest_cache" -exec rm -r {} +
 	find . -name "*.pyc" -exec rm -r {} +
 
 release: clean lint license

Makefile

@@ -20,12 +20,12 @@
 
 import grpc
 
-from common.Common_pb2 import KeyStringValuePair
-from language_agent.Tracing_pb2 import SegmentObject, SpanObject, Log, SegmentReference
 from skywalking import config
 from skywalking.agent import Protocol
 from skywalking.agent.protocol.interceptors import header_adder_interceptor
 from skywalking.client.grpc import GrpcServiceManagementClient, GrpcTraceSegmentReportService
+from skywalking.protocol.common.Common_pb2 import KeyStringValuePair
+from skywalking.protocol.language_agent.Tracing_pb2 import SegmentObject, SpanObject, Log, SegmentReference
 from skywalking.trace.segment import Segment
 
 logger = logging.getLogger(__name__)

skywalking/agent/protocol/grpc.py

@@ -18,13 +18,13 @@
 import logging
 
 import grpc
-from common.Common_pb2 import KeyStringValuePair
-from language_agent.Tracing_pb2_grpc import TraceSegmentReportServiceStub
-from management.Management_pb2 import InstancePingPkg, InstanceProperties
-from management.Management_pb2_grpc import ManagementServiceStub
 
 from skywalking import config
 from skywalking.client import ServiceManagementClient, TraceSegmentReportService
+from skywalking.protocol.common.Common_pb2 import KeyStringValuePair
+from skywalking.protocol.language_agent.Tracing_pb2_grpc import TraceSegmentReportServiceStub
+from skywalking.protocol.management.Management_pb2 import InstancePingPkg, InstanceProperties
+from skywalking.protocol.management.Management_pb2_grpc import ManagementServiceStub
 
 logger = logging.getLogger(__name__)
 

skywalking/client/grpc.py

@@ -0,0 +1,53 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+import glob
+import os
+import re
+
+from grpc_tools import protoc
+
+dest_dir = 'skywalking/protocol'
+src_dir = 'protocol'
+
+
+def touch(filename):
+    open(filename, 'a').close()
+
+
+def codegen():
+    if not os.path.exists(dest_dir):
+        os.mkdir(dest_dir)
+
+    touch(os.path.join(dest_dir, '__init__.py'))
+
+    protoc.main(['grpc_tools.protoc',
+                 '--proto_path=' + src_dir,
+                 '--python_out=' + dest_dir,
+                 '--grpc_python_out=' + dest_dir
+                 ] + [proto for proto in glob.iglob(src_dir + '/**/*.proto')])
+
+    for py_file in glob.iglob(os.path.join(dest_dir, '**/*.py')):
+        touch(os.path.join(os.path.dirname(py_file), '__init__.py'))
+        with open(py_file, 'r+') as file:
+            code = file.read()
+            file.seek(0)
+            file.write(re.sub(r'from (.+) (import .+_pb2.*)', 'from ..\\1 \\2', code))
+            file.truncate()
+
+
+if __name__ == '__main__':
+    codegen()