Configure module level loggers with basicConfig()

Module level loggers were introduced to gRPC Python in 06e1683, but
missed configuring these, leading to 'No handler found for module'
errors. Using the root logger implicitly calls basicConfig() which does
the basic configuration for the logging system by creating a
StreamHandler with a default Formatter and adding it to the logger. But
this is not the case for module level loggers.

Fix this issue by explicitly calling logging.basicConfig().

src/python/grpcio/grpc/_channel.py

@@ -24,6 +24,7 @@ from grpc import _grpcio_metadata
 from grpc._cython import cygrpc
 from grpc.framework.foundation import callable_util
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 _USER_AGENT = 'grpc-python/{}'.format(_grpcio_metadata.__version__)

src/python/grpcio/grpc/_common.py

@@ -20,6 +20,7 @@ import six
 import grpc
 from grpc._cython import cygrpc
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 CYGRPC_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY = {

src/python/grpcio/grpc/_cython/_cygrpc/grpc_string.pyx.pxi

@@ -14,6 +14,7 @@
 
 import logging
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 # This function will ascii encode unicode string inputs if neccesary.

src/python/grpcio/grpc/_cython/_cygrpc/server.pyx.pxi

@@ -18,6 +18,7 @@ import logging
 import time
 import grpc
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 cdef grpc_ssl_certificate_config_reload_status _server_cert_config_fetcher_wrapper(

src/python/grpcio/grpc/_plugin_wrapping.py

@@ -20,6 +20,7 @@ import grpc
 from grpc import _common
 from grpc._cython import cygrpc
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio/grpc/_server.py

@@ -27,6 +27,7 @@ from grpc import _interceptor
 from grpc._cython import cygrpc
 from grpc.framework.foundation import callable_util
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 _SHUTDOWN_TAG = 'shutdown'

src/python/grpcio/grpc/framework/foundation/callable_util.py

@@ -21,6 +21,7 @@ import logging
 
 import six
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio/grpc/framework/foundation/logging_pool.py

@@ -17,6 +17,7 @@ import logging
 
 from concurrent import futures
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio/grpc/framework/foundation/stream_util.py

@@ -19,6 +19,7 @@ import threading
 from grpc.framework.foundation import stream
 
 _NO_VALUE = object()
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio_testing/grpc_testing/_channel/_invocation.py

@@ -18,6 +18,7 @@ import threading
 import grpc
 
 _NOT_YET_OBSERVED = object()
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio_testing/grpc_testing/_server/_rpc.py

@@ -18,6 +18,7 @@ import threading
 import grpc
 from grpc_testing import _common
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio_testing/grpc_testing/_time.py

@@ -21,6 +21,7 @@ import time as _time
 import grpc
 import grpc_testing
 
+logging.basicConfig()
 _LOGGER = logging.getLogger(__name__)
 
 

src/python/grpcio_tests/tests/interop/server.py

@@ -25,6 +25,7 @@ from tests.interop import methods
 from tests.interop import resources
 from tests.unit import test_common
 
+logging.basicConfig()
 _ONE_DAY_IN_SECONDS = 60 * 60 * 24
 _LOGGER = logging.getLogger(__name__)