diff --git a/examples/helloworld/helloworld_pb2.py b/examples/helloworld/helloworld_pb2.py
index a16536e..55f99dc 100644
--- a/examples/helloworld/helloworld_pb2.py
+++ b/examples/helloworld/helloworld_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -16,32 +15,16 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1bhelloworld/helloworld.proto\x12\nhelloworld\"\x1c\n\x0cHelloRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\"\x1d\n\nHelloReply\x12\x0f\n\x07message\x18\x01 \x01(\t2I\n\x07Greeter\x12>\n\x08SayHello\x12\x18.helloworld.HelloRequest\x1a\x16.helloworld.HelloReply\"\x00\x62\x06proto3')
 
-
-
-_HELLOREQUEST = DESCRIPTOR.message_types_by_name['HelloRequest']
-_HELLOREPLY = DESCRIPTOR.message_types_by_name['HelloReply']
-HelloRequest = _reflection.GeneratedProtocolMessageType('HelloRequest', (_message.Message,), {
-  'DESCRIPTOR' : _HELLOREQUEST,
-  '__module__' : 'helloworld.helloworld_pb2'
-  # @@protoc_insertion_point(class_scope:helloworld.HelloRequest)
-  })
-_sym_db.RegisterMessage(HelloRequest)
-
-HelloReply = _reflection.GeneratedProtocolMessageType('HelloReply', (_message.Message,), {
-  'DESCRIPTOR' : _HELLOREPLY,
-  '__module__' : 'helloworld.helloworld_pb2'
-  # @@protoc_insertion_point(class_scope:helloworld.HelloReply)
-  })
-_sym_db.RegisterMessage(HelloReply)
-
-_GREETER = DESCRIPTOR.services_by_name['Greeter']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'helloworld.helloworld_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
-  _HELLOREQUEST._serialized_start=43
-  _HELLOREQUEST._serialized_end=71
-  _HELLOREPLY._serialized_start=73
-  _HELLOREPLY._serialized_end=102
-  _GREETER._serialized_start=104
-  _GREETER._serialized_end=177
+  _globals['_HELLOREQUEST']._serialized_start=43
+  _globals['_HELLOREQUEST']._serialized_end=71
+  _globals['_HELLOREPLY']._serialized_start=73
+  _globals['_HELLOREPLY']._serialized_end=102
+  _globals['_GREETER']._serialized_start=104
+  _globals['_GREETER']._serialized_end=177
 # @@protoc_insertion_point(module_scope)
diff --git a/examples/multiproc/primes_pb2.py b/examples/multiproc/primes_pb2.py
index df9d96f..eb71f3f 100644
--- a/examples/multiproc/primes_pb2.py
+++ b/examples/multiproc/primes_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -17,32 +16,16 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x16multiproc/primes.proto\x12\x06primes\x1a\x1egoogle/protobuf/wrappers.proto\"\x19\n\x07Request\x12\x0e\n\x06number\x18\x01 \x01(\x03\"5\n\x05Reply\x12,\n\x08is_prime\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.BoolValue23\n\x06Primes\x12)\n\x05\x43heck\x12\x0f.primes.Request\x1a\r.primes.Reply\"\x00\x62\x06proto3')
 
-
-
-_REQUEST = DESCRIPTOR.message_types_by_name['Request']
-_REPLY = DESCRIPTOR.message_types_by_name['Reply']
-Request = _reflection.GeneratedProtocolMessageType('Request', (_message.Message,), {
-  'DESCRIPTOR' : _REQUEST,
-  '__module__' : 'multiproc.primes_pb2'
-  # @@protoc_insertion_point(class_scope:primes.Request)
-  })
-_sym_db.RegisterMessage(Request)
-
-Reply = _reflection.GeneratedProtocolMessageType('Reply', (_message.Message,), {
-  'DESCRIPTOR' : _REPLY,
-  '__module__' : 'multiproc.primes_pb2'
-  # @@protoc_insertion_point(class_scope:primes.Reply)
-  })
-_sym_db.RegisterMessage(Reply)
-
-_PRIMES = DESCRIPTOR.services_by_name['Primes']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'multiproc.primes_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
-  _REQUEST._serialized_start=66
-  _REQUEST._serialized_end=91
-  _REPLY._serialized_start=93
-  _REPLY._serialized_end=146
-  _PRIMES._serialized_start=148
-  _PRIMES._serialized_end=199
+  _globals['_REQUEST']._serialized_start=66
+  _globals['_REQUEST']._serialized_end=91
+  _globals['_REPLY']._serialized_start=93
+  _globals['_REPLY']._serialized_end=146
+  _globals['_PRIMES']._serialized_start=148
+  _globals['_PRIMES']._serialized_end=199
 # @@protoc_insertion_point(module_scope)
diff --git a/examples/streaming/helloworld_pb2.py b/examples/streaming/helloworld_pb2.py
index b6c7d7e..53761ed 100644
--- a/examples/streaming/helloworld_pb2.py
+++ b/examples/streaming/helloworld_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -16,32 +15,16 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1astreaming/helloworld.proto\x12\nhelloworld\"\x1c\n\x0cHelloRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\"\x1d\n\nHelloReply\x12\x0f\n\x07message\x18\x01 \x01(\t2\xbd\x02\n\x07Greeter\x12H\n\x12UnaryUnaryGreeting\x12\x18.helloworld.HelloRequest\x1a\x16.helloworld.HelloReply\"\x00\x12K\n\x13UnaryStreamGreeting\x12\x18.helloworld.HelloRequest\x1a\x16.helloworld.HelloReply\"\x00\x30\x01\x12K\n\x13StreamUnaryGreeting\x12\x18.helloworld.HelloRequest\x1a\x16.helloworld.HelloReply\"\x00(\x01\x12N\n\x14StreamStreamGreeting\x12\x18.helloworld.HelloRequest\x1a\x16.helloworld.HelloReply\"\x00(\x01\x30\x01\x62\x06proto3')
 
-
-
-_HELLOREQUEST = DESCRIPTOR.message_types_by_name['HelloRequest']
-_HELLOREPLY = DESCRIPTOR.message_types_by_name['HelloReply']
-HelloRequest = _reflection.GeneratedProtocolMessageType('HelloRequest', (_message.Message,), {
-  'DESCRIPTOR' : _HELLOREQUEST,
-  '__module__' : 'streaming.helloworld_pb2'
-  # @@protoc_insertion_point(class_scope:helloworld.HelloRequest)
-  })
-_sym_db.RegisterMessage(HelloRequest)
-
-HelloReply = _reflection.GeneratedProtocolMessageType('HelloReply', (_message.Message,), {
-  'DESCRIPTOR' : _HELLOREPLY,
-  '__module__' : 'streaming.helloworld_pb2'
-  # @@protoc_insertion_point(class_scope:helloworld.HelloReply)
-  })
-_sym_db.RegisterMessage(HelloReply)
-
-_GREETER = DESCRIPTOR.services_by_name['Greeter']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'streaming.helloworld_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
-  _HELLOREQUEST._serialized_start=42
-  _HELLOREQUEST._serialized_end=70
-  _HELLOREPLY._serialized_start=72
-  _HELLOREPLY._serialized_end=101
-  _GREETER._serialized_start=104
-  _GREETER._serialized_end=421
+  _globals['_HELLOREQUEST']._serialized_start=42
+  _globals['_HELLOREQUEST']._serialized_end=70
+  _globals['_HELLOREPLY']._serialized_start=72
+  _globals['_HELLOREPLY']._serialized_end=101
+  _globals['_GREETER']._serialized_start=104
+  _globals['_GREETER']._serialized_end=421
 # @@protoc_insertion_point(module_scope)
diff --git a/grpclib/channelz/v1/channelz_pb2.py b/grpclib/channelz/v1/channelz_pb2.py
index b8888e4..cb5551e 100644
--- a/grpclib/channelz/v1/channelz_pb2.py
+++ b/grpclib/channelz/v1/channelz_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -20,414 +19,95 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\"grpclib/channelz/v1/channelz.proto\x12\x10grpc.channelz.v1\x1a\x19google/protobuf/any.proto\x1a\x1egoogle/protobuf/duration.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"\xfe\x01\n\x07\x43hannel\x12)\n\x03ref\x18\x01 \x01(\x0b\x32\x1c.grpc.channelz.v1.ChannelRef\x12+\n\x04\x64\x61ta\x18\x02 \x01(\x0b\x32\x1d.grpc.channelz.v1.ChannelData\x12\x31\n\x0b\x63hannel_ref\x18\x03 \x03(\x0b\x32\x1c.grpc.channelz.v1.ChannelRef\x12\x37\n\x0esubchannel_ref\x18\x04 \x03(\x0b\x32\x1f.grpc.channelz.v1.SubchannelRef\x12/\n\nsocket_ref\x18\x05 \x03(\x0b\x32\x1b.grpc.channelz.v1.SocketRef\"\x84\x02\n\nSubchannel\x12,\n\x03ref\x18\x01 \x01(\x0b\x32\x1f.grpc.channelz.v1.SubchannelRef\x12+\n\x04\x64\x61ta\x18\x02 \x01(\x0b\x32\x1d.grpc.channelz.v1.ChannelData\x12\x31\n\x0b\x63hannel_ref\x18\x03 \x03(\x0b\x32\x1c.grpc.channelz.v1.ChannelRef\x12\x37\n\x0esubchannel_ref\x18\x04 \x03(\x0b\x32\x1f.grpc.channelz.v1.SubchannelRef\x12/\n\nsocket_ref\x18\x05 \x03(\x0b\x32\x1b.grpc.channelz.v1.SocketRef\"\xbb\x01\n\x18\x43hannelConnectivityState\x12?\n\x05state\x18\x01 \x01(\x0e\x32\x30.grpc.channelz.v1.ChannelConnectivityState.State\"^\n\x05State\x12\x0b\n\x07UNKNOWN\x10\x00\x12\x08\n\x04IDLE\x10\x01\x12\x0e\n\nCONNECTING\x10\x02\x12\t\n\x05READY\x10\x03\x12\x15\n\x11TRANSIENT_FAILURE\x10\x04\x12\x0c\n\x08SHUTDOWN\x10\x05\"\x8e\x02\n\x0b\x43hannelData\x12\x39\n\x05state\x18\x01 \x01(\x0b\x32*.grpc.channelz.v1.ChannelConnectivityState\x12\x0e\n\x06target\x18\x02 \x01(\t\x12-\n\x05trace\x18\x03 \x01(\x0b\x32\x1e.grpc.channelz.v1.ChannelTrace\x12\x15\n\rcalls_started\x18\x04 \x01(\x03\x12\x17\n\x0f\x63\x61lls_succeeded\x18\x05 \x01(\x03\x12\x14\n\x0c\x63\x61lls_failed\x18\x06 \x01(\x03\x12?\n\x1blast_call_started_timestamp\x18\x07 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\"\xdb\x02\n\x11\x43hannelTraceEvent\x12\x13\n\x0b\x64\x65scription\x18\x01 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\x01(\x0b\x32&.grpc.channelz.v1.Address.OtherAddressH\x00\x1a\x30\n\x0cTcpIpAddress\x12\x12\n\nip_address\x18\x01 \x01(\x0c\x12\x0c\n\x04port\x18\x02 \x01(\x05\x1a\x1e\n\nUdsAddress\x12\x10\n\x08\x66ilename\x18\x01 \x01(\t\x1a\x41\n\x0cOtherAddress\x12\x0c\n\x04name\x18\x01 \x01(\t\x12#\n\x05value\x18\x02 \x01(\x0b\x32\x14.google.protobuf.AnyB\t\n\x07\x61\x64\x64ress\"\xbe\x02\n\x08Security\x12-\n\x03tls\x18\x01 \x01(\x0b\x32\x1e.grpc.channelz.v1.Security.TlsH\x00\x12\x39\n\x05other\x18\x02 \x01(\x0b\x32(.grpc.channelz.v1.Security.OtherSecurityH\x00\x1a{\n\x03Tls\x12\x17\n\rstandard_name\x18\x01 \x01(\tH\x00\x12\x14\n\nother_name\x18\x02 \x01(\tH\x00\x12\x19\n\x11local_certificate\x18\x03 \x01(\x0c\x12\x1a\n\x12remote_certificate\x18\x04 \x01(\x0c\x42\x0e\n\x0c\x63ipher_suite\x1a\x42\n\rOtherSecurity\x12\x0c\n\x04name\x18\x01 \x01(\t\x12#\n\x05value\x18\x02 \x01(\x0b\x32\x14.google.protobuf.AnyB\x07\n\x05model\"U\n\x0cSocketOption\x12\x0c\n\x04name\x18\x01 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\x01(\r\x12\x14\n\x0ctcpi_retrans\x18\x10 \x01(\r\x12\x14\n\x0ctcpi_fackets\x18\x11 \x01(\r\x12\x1b\n\x13tcpi_last_data_sent\x18\x12 \x01(\r\x12\x1a\n\x12tcpi_last_ack_sent\x18\x13 \x01(\r\x12\x1b\n\x13tcpi_last_data_recv\x18\x14 \x01(\r\x12\x1a\n\x12tcpi_last_ack_recv\x18\x15 \x01(\r\x12\x11\n\ttcpi_pmtu\x18\x16 \x01(\r\x12\x19\n\x11tcpi_rcv_ssthresh\x18\x17 \x01(\r\x12\x10\n\x08tcpi_rtt\x18\x18 \x01(\r\x12\x13\n\x0btcpi_rttvar\x18\x19 \x01(\r\x12\x19\n\x11tcpi_snd_ssthresh\x18\x1a \x01(\r\x12\x15\n\rtcpi_snd_cwnd\x18\x1b \x01(\r\x12\x13\n\x0btcpi_advmss\x18\x1c \x01(\r\x12\x17\n\x0ftcpi_reordering\x18\x1d \x01(\r\"F\n\x15GetTopChannelsRequest\x12\x18\n\x10start_channel_id\x18\x01 \x01(\x03\x12\x13\n\x0bmax_results\x18\x02 \x01(\x03\"Q\n\x16GetTopChannelsResponse\x12*\n\x07\x63hannel\x18\x01 \x03(\x0b\x32\x19.grpc.channelz.v1.Channel\x12\x0b\n\x03\x65nd\x18\x02 \x01(\x08\"A\n\x11GetServersRequest\x12\x17\n\x0fstart_server_id\x18\x01 \x01(\x03\x12\x13\n\x0bmax_results\x18\x02 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\x01(\x03\x12\x0f\n\x07summary\x18\x02 \x01(\x08\"=\n\x11GetSocketResponse\x12(\n\x06socket\x18\x01 \x01(\x0b\x32\x18.grpc.channelz.v1.Socket2\x9a\x05\n\x08\x43hannelz\x12\x63\n\x0eGetTopChannels\x12\'.grpc.channelz.v1.GetTopChannelsRequest\x1a(.grpc.channelz.v1.GetTopChannelsResponse\x12W\n\nGetServers\x12#.grpc.channelz.v1.GetServersRequest\x1a$.grpc.channelz.v1.GetServersResponse\x12T\n\tGetServer\x12\".grpc.channelz.v1.GetServerRequest\x1a#.grpc.channelz.v1.GetServerResponse\x12i\n\x10GetServerSockets\x12).grpc.channelz.v1.GetServerSocketsRequest\x1a*.grpc.channelz.v1.GetServerSocketsResponse\x12W\n\nGetChannel\x12#.grpc.channelz.v1.GetChannelRequest\x1a$.grpc.channelz.v1.GetChannelResponse\x12`\n\rGetSubchannel\x12&.grpc.channelz.v1.GetSubchannelRequest\x1a\'.grpc.channelz.v1.GetSubchannelResponse\x12T\n\tGetSocket\x12\".grpc.channelz.v1.GetSocketRequest\x1a#.grpc.channelz.v1.GetSocketResponseBX\n\x13io.grpc.channelz.v1B\rChannelzProtoP\x01Z0google.golang.org/grpc/channelz/grpc_channelz_v1b\x06proto3')
 
-
-
-_CHANNEL = DESCRIPTOR.message_types_by_name['Channel']
-_SUBCHANNEL = DESCRIPTOR.message_types_by_name['Subchannel']
-_CHANNELCONNECTIVITYSTATE = DESCRIPTOR.message_types_by_name['ChannelConnectivityState']
-_CHANNELDATA = DESCRIPTOR.message_types_by_name['ChannelData']
-_CHANNELTRACEEVENT = DESCRIPTOR.message_types_by_name['ChannelTraceEvent']
-_CHANNELTRACE = DESCRIPTOR.message_types_by_name['ChannelTrace']
-_CHANNELREF = DESCRIPTOR.message_types_by_name['ChannelRef']
-_SUBCHANNELREF = DESCRIPTOR.message_types_by_name['SubchannelRef']
-_SOCKETREF = DESCRIPTOR.message_types_by_name['SocketRef']
-_SERVERREF = DESCRIPTOR.message_types_by_name['ServerRef']
-_SERVER = DESCRIPTOR.message_types_by_name['Server']
-_SERVERDATA = DESCRIPTOR.message_types_by_name['ServerData']
-_SOCKET = DESCRIPTOR.message_types_by_name['Socket']
-_SOCKETDATA = DESCRIPTOR.message_types_by_name['SocketData']
-_ADDRESS = DESCRIPTOR.message_types_by_name['Address']
-_ADDRESS_TCPIPADDRESS = _ADDRESS.nested_types_by_name['TcpIpAddress']
-_ADDRESS_UDSADDRESS = _ADDRESS.nested_types_by_name['UdsAddress']
-_ADDRESS_OTHERADDRESS = _ADDRESS.nested_types_by_name['OtherAddress']
-_SECURITY = DESCRIPTOR.message_types_by_name['Security']
-_SECURITY_TLS = _SECURITY.nested_types_by_name['Tls']
-_SECURITY_OTHERSECURITY = _SECURITY.nested_types_by_name['OtherSecurity']
-_SOCKETOPTION = DESCRIPTOR.message_types_by_name['SocketOption']
-_SOCKETOPTIONTIMEOUT = DESCRIPTOR.message_types_by_name['SocketOptionTimeout']
-_SOCKETOPTIONLINGER = DESCRIPTOR.message_types_by_name['SocketOptionLinger']
-_SOCKETOPTIONTCPINFO = DESCRIPTOR.message_types_by_name['SocketOptionTcpInfo']
-_GETTOPCHANNELSREQUEST = DESCRIPTOR.message_types_by_name['GetTopChannelsRequest']
-_GETTOPCHANNELSRESPONSE = DESCRIPTOR.message_types_by_name['GetTopChannelsResponse']
-_GETSERVERSREQUEST = DESCRIPTOR.message_types_by_name['GetServersRequest']
-_GETSERVERSRESPONSE = DESCRIPTOR.message_types_by_name['GetServersResponse']
-_GETSERVERREQUEST = DESCRIPTOR.message_types_by_name['GetServerRequest']
-_GETSERVERRESPONSE = DESCRIPTOR.message_types_by_name['GetServerResponse']
-_GETSERVERSOCKETSREQUEST = DESCRIPTOR.message_types_by_name['GetServerSocketsRequest']
-_GETSERVERSOCKETSRESPONSE = DESCRIPTOR.message_types_by_name['GetServerSocketsResponse']
-_GETCHANNELREQUEST = DESCRIPTOR.message_types_by_name['GetChannelRequest']
-_GETCHANNELRESPONSE = DESCRIPTOR.message_types_by_name['GetChannelResponse']
-_GETSUBCHANNELREQUEST = DESCRIPTOR.message_types_by_name['GetSubchannelRequest']
-_GETSUBCHANNELRESPONSE = DESCRIPTOR.message_types_by_name['GetSubchannelResponse']
-_GETSOCKETREQUEST = DESCRIPTOR.message_types_by_name['GetSocketRequest']
-_GETSOCKETRESPONSE = DESCRIPTOR.message_types_by_name['GetSocketResponse']
-_CHANNELCONNECTIVITYSTATE_STATE = _CHANNELCONNECTIVITYSTATE.enum_types_by_name['State']
-_CHANNELTRACEEVENT_SEVERITY = _CHANNELTRACEEVENT.enum_types_by_name['Severity']
-Channel = _reflection.GeneratedProtocolMessageType('Channel', (_message.Message,), {
-  'DESCRIPTOR' : _CHANNEL,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Channel)
-  })
-_sym_db.RegisterMessage(Channel)
-
-Subchannel = _reflection.GeneratedProtocolMessageType('Subchannel', (_message.Message,), {
-  'DESCRIPTOR' : _SUBCHANNEL,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Subchannel)
-  })
-_sym_db.RegisterMessage(Subchannel)
-
-ChannelConnectivityState = _reflection.GeneratedProtocolMessageType('ChannelConnectivityState', (_message.Message,), {
-  'DESCRIPTOR' : _CHANNELCONNECTIVITYSTATE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ChannelConnectivityState)
-  })
-_sym_db.RegisterMessage(ChannelConnectivityState)
-
-ChannelData = _reflection.GeneratedProtocolMessageType('ChannelData', (_message.Message,), {
-  'DESCRIPTOR' : _CHANNELDATA,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ChannelData)
-  })
-_sym_db.RegisterMessage(ChannelData)
-
-ChannelTraceEvent = _reflection.GeneratedProtocolMessageType('ChannelTraceEvent', (_message.Message,), {
-  'DESCRIPTOR' : _CHANNELTRACEEVENT,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ChannelTraceEvent)
-  })
-_sym_db.RegisterMessage(ChannelTraceEvent)
-
-ChannelTrace = _reflection.GeneratedProtocolMessageType('ChannelTrace', (_message.Message,), {
-  'DESCRIPTOR' : _CHANNELTRACE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ChannelTrace)
-  })
-_sym_db.RegisterMessage(ChannelTrace)
-
-ChannelRef = _reflection.GeneratedProtocolMessageType('ChannelRef', (_message.Message,), {
-  'DESCRIPTOR' : _CHANNELREF,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ChannelRef)
-  })
-_sym_db.RegisterMessage(ChannelRef)
-
-SubchannelRef = _reflection.GeneratedProtocolMessageType('SubchannelRef', (_message.Message,), {
-  'DESCRIPTOR' : _SUBCHANNELREF,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SubchannelRef)
-  })
-_sym_db.RegisterMessage(SubchannelRef)
-
-SocketRef = _reflection.GeneratedProtocolMessageType('SocketRef', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKETREF,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SocketRef)
-  })
-_sym_db.RegisterMessage(SocketRef)
-
-ServerRef = _reflection.GeneratedProtocolMessageType('ServerRef', (_message.Message,), {
-  'DESCRIPTOR' : _SERVERREF,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ServerRef)
-  })
-_sym_db.RegisterMessage(ServerRef)
-
-Server = _reflection.GeneratedProtocolMessageType('Server', (_message.Message,), {
-  'DESCRIPTOR' : _SERVER,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Server)
-  })
-_sym_db.RegisterMessage(Server)
-
-ServerData = _reflection.GeneratedProtocolMessageType('ServerData', (_message.Message,), {
-  'DESCRIPTOR' : _SERVERDATA,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.ServerData)
-  })
-_sym_db.RegisterMessage(ServerData)
-
-Socket = _reflection.GeneratedProtocolMessageType('Socket', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKET,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Socket)
-  })
-_sym_db.RegisterMessage(Socket)
-
-SocketData = _reflection.GeneratedProtocolMessageType('SocketData', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKETDATA,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SocketData)
-  })
-_sym_db.RegisterMessage(SocketData)
-
-Address = _reflection.GeneratedProtocolMessageType('Address', (_message.Message,), {
-
-  'TcpIpAddress' : _reflection.GeneratedProtocolMessageType('TcpIpAddress', (_message.Message,), {
-    'DESCRIPTOR' : _ADDRESS_TCPIPADDRESS,
-    '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-    # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Address.TcpIpAddress)
-    })
-  ,
-
-  'UdsAddress' : _reflection.GeneratedProtocolMessageType('UdsAddress', (_message.Message,), {
-    'DESCRIPTOR' : _ADDRESS_UDSADDRESS,
-    '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-    # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Address.UdsAddress)
-    })
-  ,
-
-  'OtherAddress' : _reflection.GeneratedProtocolMessageType('OtherAddress', (_message.Message,), {
-    'DESCRIPTOR' : _ADDRESS_OTHERADDRESS,
-    '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-    # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Address.OtherAddress)
-    })
-  ,
-  'DESCRIPTOR' : _ADDRESS,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Address)
-  })
-_sym_db.RegisterMessage(Address)
-_sym_db.RegisterMessage(Address.TcpIpAddress)
-_sym_db.RegisterMessage(Address.UdsAddress)
-_sym_db.RegisterMessage(Address.OtherAddress)
-
-Security = _reflection.GeneratedProtocolMessageType('Security', (_message.Message,), {
-
-  'Tls' : _reflection.GeneratedProtocolMessageType('Tls', (_message.Message,), {
-    'DESCRIPTOR' : _SECURITY_TLS,
-    '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-    # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Security.Tls)
-    })
-  ,
-
-  'OtherSecurity' : _reflection.GeneratedProtocolMessageType('OtherSecurity', (_message.Message,), {
-    'DESCRIPTOR' : _SECURITY_OTHERSECURITY,
-    '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-    # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Security.OtherSecurity)
-    })
-  ,
-  'DESCRIPTOR' : _SECURITY,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.Security)
-  })
-_sym_db.RegisterMessage(Security)
-_sym_db.RegisterMessage(Security.Tls)
-_sym_db.RegisterMessage(Security.OtherSecurity)
-
-SocketOption = _reflection.GeneratedProtocolMessageType('SocketOption', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKETOPTION,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SocketOption)
-  })
-_sym_db.RegisterMessage(SocketOption)
-
-SocketOptionTimeout = _reflection.GeneratedProtocolMessageType('SocketOptionTimeout', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKETOPTIONTIMEOUT,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SocketOptionTimeout)
-  })
-_sym_db.RegisterMessage(SocketOptionTimeout)
-
-SocketOptionLinger = _reflection.GeneratedProtocolMessageType('SocketOptionLinger', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKETOPTIONLINGER,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SocketOptionLinger)
-  })
-_sym_db.RegisterMessage(SocketOptionLinger)
-
-SocketOptionTcpInfo = _reflection.GeneratedProtocolMessageType('SocketOptionTcpInfo', (_message.Message,), {
-  'DESCRIPTOR' : _SOCKETOPTIONTCPINFO,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.SocketOptionTcpInfo)
-  })
-_sym_db.RegisterMessage(SocketOptionTcpInfo)
-
-GetTopChannelsRequest = _reflection.GeneratedProtocolMessageType('GetTopChannelsRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETTOPCHANNELSREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetTopChannelsRequest)
-  })
-_sym_db.RegisterMessage(GetTopChannelsRequest)
-
-GetTopChannelsResponse = _reflection.GeneratedProtocolMessageType('GetTopChannelsResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETTOPCHANNELSRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetTopChannelsResponse)
-  })
-_sym_db.RegisterMessage(GetTopChannelsResponse)
-
-GetServersRequest = _reflection.GeneratedProtocolMessageType('GetServersRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETSERVERSREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetServersRequest)
-  })
-_sym_db.RegisterMessage(GetServersRequest)
-
-GetServersResponse = _reflection.GeneratedProtocolMessageType('GetServersResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETSERVERSRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetServersResponse)
-  })
-_sym_db.RegisterMessage(GetServersResponse)
-
-GetServerRequest = _reflection.GeneratedProtocolMessageType('GetServerRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETSERVERREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetServerRequest)
-  })
-_sym_db.RegisterMessage(GetServerRequest)
-
-GetServerResponse = _reflection.GeneratedProtocolMessageType('GetServerResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETSERVERRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetServerResponse)
-  })
-_sym_db.RegisterMessage(GetServerResponse)
-
-GetServerSocketsRequest = _reflection.GeneratedProtocolMessageType('GetServerSocketsRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETSERVERSOCKETSREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetServerSocketsRequest)
-  })
-_sym_db.RegisterMessage(GetServerSocketsRequest)
-
-GetServerSocketsResponse = _reflection.GeneratedProtocolMessageType('GetServerSocketsResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETSERVERSOCKETSRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetServerSocketsResponse)
-  })
-_sym_db.RegisterMessage(GetServerSocketsResponse)
-
-GetChannelRequest = _reflection.GeneratedProtocolMessageType('GetChannelRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETCHANNELREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetChannelRequest)
-  })
-_sym_db.RegisterMessage(GetChannelRequest)
-
-GetChannelResponse = _reflection.GeneratedProtocolMessageType('GetChannelResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETCHANNELRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetChannelResponse)
-  })
-_sym_db.RegisterMessage(GetChannelResponse)
-
-GetSubchannelRequest = _reflection.GeneratedProtocolMessageType('GetSubchannelRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETSUBCHANNELREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetSubchannelRequest)
-  })
-_sym_db.RegisterMessage(GetSubchannelRequest)
-
-GetSubchannelResponse = _reflection.GeneratedProtocolMessageType('GetSubchannelResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETSUBCHANNELRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetSubchannelResponse)
-  })
-_sym_db.RegisterMessage(GetSubchannelResponse)
-
-GetSocketRequest = _reflection.GeneratedProtocolMessageType('GetSocketRequest', (_message.Message,), {
-  'DESCRIPTOR' : _GETSOCKETREQUEST,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetSocketRequest)
-  })
-_sym_db.RegisterMessage(GetSocketRequest)
-
-GetSocketResponse = _reflection.GeneratedProtocolMessageType('GetSocketResponse', (_message.Message,), {
-  'DESCRIPTOR' : _GETSOCKETRESPONSE,
-  '__module__' : 'grpclib.channelz.v1.channelz_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.channelz.v1.GetSocketResponse)
-  })
-_sym_db.RegisterMessage(GetSocketResponse)
-
-_CHANNELZ = DESCRIPTOR.services_by_name['Channelz']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'grpclib.channelz.v1.channelz_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
   DESCRIPTOR._serialized_options = b'\n\023io.grpc.channelz.v1B\rChannelzProtoP\001Z0google.golang.org/grpc/channelz/grpc_channelz_v1'
-  _CHANNEL._serialized_start=181
-  _CHANNEL._serialized_end=435
-  _SUBCHANNEL._serialized_start=438
-  _SUBCHANNEL._serialized_end=698
-  _CHANNELCONNECTIVITYSTATE._serialized_start=701
-  _CHANNELCONNECTIVITYSTATE._serialized_end=888
-  _CHANNELCONNECTIVITYSTATE_STATE._serialized_start=794
-  _CHANNELCONNECTIVITYSTATE_STATE._serialized_end=888
-  _CHANNELDATA._serialized_start=891
-  _CHANNELDATA._serialized_end=1161
-  _CHANNELTRACEEVENT._serialized_start=1164
-  _CHANNELTRACEEVENT._serialized_end=1511
-  _CHANNELTRACEEVENT_SEVERITY._serialized_start=1429
-  _CHANNELTRACEEVENT_SEVERITY._serialized_end=1498
-  _CHANNELTRACE._serialized_start=1514
-  _CHANNELTRACE._serialized_end=1664
-  _CHANNELREF._serialized_start=1666
-  _CHANNELREF._serialized_end=1748
-  _SUBCHANNELREF._serialized_start=1750
-  _SUBCHANNELREF._serialized_end=1838
-  _SOCKETREF._serialized_start=1840
-  _SOCKETREF._serialized_end=1920
-  _SERVERREF._serialized_start=1922
-  _SERVERREF._serialized_end=2002
-  _SERVER._serialized_start=2005
-  _SERVER._serialized_end=2151
-  _SERVERDATA._serialized_start=2154
-  _SERVERDATA._serialized_end=2348
-  _SOCKET._serialized_start=2351
-  _SOCKET._serialized_end=2597
-  _SOCKETDATA._serialized_start=2600
-  _SOCKETDATA._serialized_end=3222
-  _ADDRESS._serialized_start=3225
-  _ADDRESS._serialized_end=3585
-  _ADDRESS_TCPIPADDRESS._serialized_start=3427
-  _ADDRESS_TCPIPADDRESS._serialized_end=3475
-  _ADDRESS_UDSADDRESS._serialized_start=3477
-  _ADDRESS_UDSADDRESS._serialized_end=3507
-  _ADDRESS_OTHERADDRESS._serialized_start=3509
-  _ADDRESS_OTHERADDRESS._serialized_end=3574
-  _SECURITY._serialized_start=3588
-  _SECURITY._serialized_end=3906
-  _SECURITY_TLS._serialized_start=3706
-  _SECURITY_TLS._serialized_end=3829
-  _SECURITY_OTHERSECURITY._serialized_start=3831
-  _SECURITY_OTHERSECURITY._serialized_end=3897
-  _SOCKETOPTION._serialized_start=3908
-  _SOCKETOPTION._serialized_end=3993
-  _SOCKETOPTIONTIMEOUT._serialized_start=3995
-  _SOCKETOPTIONTIMEOUT._serialized_end=4061
-  _SOCKETOPTIONLINGER._serialized_start=4063
-  _SOCKETOPTIONLINGER._serialized_end=4144
-  _SOCKETOPTIONTCPINFO._serialized_start=4147
-  _SOCKETOPTIONTCPINFO._serialized_end=4833
-  _GETTOPCHANNELSREQUEST._serialized_start=4835
-  _GETTOPCHANNELSREQUEST._serialized_end=4905
-  _GETTOPCHANNELSRESPONSE._serialized_start=4907
-  _GETTOPCHANNELSRESPONSE._serialized_end=4988
-  _GETSERVERSREQUEST._serialized_start=4990
-  _GETSERVERSREQUEST._serialized_end=5055
-  _GETSERVERSRESPONSE._serialized_start=5057
-  _GETSERVERSRESPONSE._serialized_end=5132
-  _GETSERVERREQUEST._serialized_start=5134
-  _GETSERVERREQUEST._serialized_end=5171
-  _GETSERVERRESPONSE._serialized_start=5173
-  _GETSERVERRESPONSE._serialized_end=5234
-  _GETSERVERSOCKETSREQUEST._serialized_start=5236
-  _GETSERVERSOCKETSREQUEST._serialized_end=5326
-  _GETSERVERSOCKETSRESPONSE._serialized_start=5328
-  _GETSERVERSOCKETSRESPONSE._serialized_end=5416
-  _GETCHANNELREQUEST._serialized_start=5418
-  _GETCHANNELREQUEST._serialized_end=5457
-  _GETCHANNELRESPONSE._serialized_start=5459
-  _GETCHANNELRESPONSE._serialized_end=5523
-  _GETSUBCHANNELREQUEST._serialized_start=5525
-  _GETSUBCHANNELREQUEST._serialized_end=5570
-  _GETSUBCHANNELRESPONSE._serialized_start=5572
-  _GETSUBCHANNELRESPONSE._serialized_end=5645
-  _GETSOCKETREQUEST._serialized_start=5647
-  _GETSOCKETREQUEST._serialized_end=5701
-  _GETSOCKETRESPONSE._serialized_start=5703
-  _GETSOCKETRESPONSE._serialized_end=5764
-  _CHANNELZ._serialized_start=5767
-  _CHANNELZ._serialized_end=6433
+  _globals['_CHANNEL']._serialized_start=181
+  _globals['_CHANNEL']._serialized_end=435
+  _globals['_SUBCHANNEL']._serialized_start=438
+  _globals['_SUBCHANNEL']._serialized_end=698
+  _globals['_CHANNELCONNECTIVITYSTATE']._serialized_start=701
+  _globals['_CHANNELCONNECTIVITYSTATE']._serialized_end=888
+  _globals['_CHANNELCONNECTIVITYSTATE_STATE']._serialized_start=794
+  _globals['_CHANNELCONNECTIVITYSTATE_STATE']._serialized_end=888
+  _globals['_CHANNELDATA']._serialized_start=891
+  _globals['_CHANNELDATA']._serialized_end=1161
+  _globals['_CHANNELTRACEEVENT']._serialized_start=1164
+  _globals['_CHANNELTRACEEVENT']._serialized_end=1511
+  _globals['_CHANNELTRACEEVENT_SEVERITY']._serialized_start=1429
+  _globals['_CHANNELTRACEEVENT_SEVERITY']._serialized_end=1498
+  _globals['_CHANNELTRACE']._serialized_start=1514
+  _globals['_CHANNELTRACE']._serialized_end=1664
+  _globals['_CHANNELREF']._serialized_start=1666
+  _globals['_CHANNELREF']._serialized_end=1748
+  _globals['_SUBCHANNELREF']._serialized_start=1750
+  _globals['_SUBCHANNELREF']._serialized_end=1838
+  _globals['_SOCKETREF']._serialized_start=1840
+  _globals['_SOCKETREF']._serialized_end=1920
+  _globals['_SERVERREF']._serialized_start=1922
+  _globals['_SERVERREF']._serialized_end=2002
+  _globals['_SERVER']._serialized_start=2005
+  _globals['_SERVER']._serialized_end=2151
+  _globals['_SERVERDATA']._serialized_start=2154
+  _globals['_SERVERDATA']._serialized_end=2348
+  _globals['_SOCKET']._serialized_start=2351
+  _globals['_SOCKET']._serialized_end=2597
+  _globals['_SOCKETDATA']._serialized_start=2600
+  _globals['_SOCKETDATA']._serialized_end=3222
+  _globals['_ADDRESS']._serialized_start=3225
+  _globals['_ADDRESS']._serialized_end=3585
+  _globals['_ADDRESS_TCPIPADDRESS']._serialized_start=3427
+  _globals['_ADDRESS_TCPIPADDRESS']._serialized_end=3475
+  _globals['_ADDRESS_UDSADDRESS']._serialized_start=3477
+  _globals['_ADDRESS_UDSADDRESS']._serialized_end=3507
+  _globals['_ADDRESS_OTHERADDRESS']._serialized_start=3509
+  _globals['_ADDRESS_OTHERADDRESS']._serialized_end=3574
+  _globals['_SECURITY']._serialized_start=3588
+  _globals['_SECURITY']._serialized_end=3906
+  _globals['_SECURITY_TLS']._serialized_start=3706
+  _globals['_SECURITY_TLS']._serialized_end=3829
+  _globals['_SECURITY_OTHERSECURITY']._serialized_start=3831
+  _globals['_SECURITY_OTHERSECURITY']._serialized_end=3897
+  _globals['_SOCKETOPTION']._serialized_start=3908
+  _globals['_SOCKETOPTION']._serialized_end=3993
+  _globals['_SOCKETOPTIONTIMEOUT']._serialized_start=3995
+  _globals['_SOCKETOPTIONTIMEOUT']._serialized_end=4061
+  _globals['_SOCKETOPTIONLINGER']._serialized_start=4063
+  _globals['_SOCKETOPTIONLINGER']._serialized_end=4144
+  _globals['_SOCKETOPTIONTCPINFO']._serialized_start=4147
+  _globals['_SOCKETOPTIONTCPINFO']._serialized_end=4833
+  _globals['_GETTOPCHANNELSREQUEST']._serialized_start=4835
+  _globals['_GETTOPCHANNELSREQUEST']._serialized_end=4905
+  _globals['_GETTOPCHANNELSRESPONSE']._serialized_start=4907
+  _globals['_GETTOPCHANNELSRESPONSE']._serialized_end=4988
+  _globals['_GETSERVERSREQUEST']._serialized_start=4990
+  _globals['_GETSERVERSREQUEST']._serialized_end=5055
+  _globals['_GETSERVERSRESPONSE']._serialized_start=5057
+  _globals['_GETSERVERSRESPONSE']._serialized_end=5132
+  _globals['_GETSERVERREQUEST']._serialized_start=5134
+  _globals['_GETSERVERREQUEST']._serialized_end=5171
+  _globals['_GETSERVERRESPONSE']._serialized_start=5173
+  _globals['_GETSERVERRESPONSE']._serialized_end=5234
+  _globals['_GETSERVERSOCKETSREQUEST']._serialized_start=5236
+  _globals['_GETSERVERSOCKETSREQUEST']._serialized_end=5326
+  _globals['_GETSERVERSOCKETSRESPONSE']._serialized_start=5328
+  _globals['_GETSERVERSOCKETSRESPONSE']._serialized_end=5416
+  _globals['_GETCHANNELREQUEST']._serialized_start=5418
+  _globals['_GETCHANNELREQUEST']._serialized_end=5457
+  _globals['_GETCHANNELRESPONSE']._serialized_start=5459
+  _globals['_GETCHANNELRESPONSE']._serialized_end=5523
+  _globals['_GETSUBCHANNELREQUEST']._serialized_start=5525
+  _globals['_GETSUBCHANNELREQUEST']._serialized_end=5570
+  _globals['_GETSUBCHANNELRESPONSE']._serialized_start=5572
+  _globals['_GETSUBCHANNELRESPONSE']._serialized_end=5645
+  _globals['_GETSOCKETREQUEST']._serialized_start=5647
+  _globals['_GETSOCKETREQUEST']._serialized_end=5701
+  _globals['_GETSOCKETRESPONSE']._serialized_start=5703
+  _globals['_GETSOCKETRESPONSE']._serialized_end=5764
+  _globals['_CHANNELZ']._serialized_start=5767
+  _globals['_CHANNELZ']._serialized_end=6433
 # @@protoc_insertion_point(module_scope)
diff --git a/grpclib/health/v1/health_pb2.py b/grpclib/health/v1/health_pb2.py
index a0d0a6e..11ac3bc 100644
--- a/grpclib/health/v1/health_pb2.py
+++ b/grpclib/health/v1/health_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -16,36 +15,19 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1egrpclib/health/v1/health.proto\x12\x0egrpc.health.v1\"%\n\x12HealthCheckRequest\x12\x0f\n\x07service\x18\x01 \x01(\t\"\xa9\x01\n\x13HealthCheckResponse\x12\x41\n\x06status\x18\x01 \x01(\x0e\x32\x31.grpc.health.v1.HealthCheckResponse.ServingStatus\"O\n\rServingStatus\x12\x0b\n\x07UNKNOWN\x10\x00\x12\x0b\n\x07SERVING\x10\x01\x12\x0f\n\x0bNOT_SERVING\x10\x02\x12\x13\n\x0fSERVICE_UNKNOWN\x10\x03\x32\xae\x01\n\x06Health\x12P\n\x05\x43heck\x12\".grpc.health.v1.HealthCheckRequest\x1a#.grpc.health.v1.HealthCheckResponse\x12R\n\x05Watch\x12\".grpc.health.v1.HealthCheckRequest\x1a#.grpc.health.v1.HealthCheckResponse0\x01\x42\x61\n\x11io.grpc.health.v1B\x0bHealthProtoP\x01Z,google.golang.org/grpc/health/grpc_health_v1\xaa\x02\x0eGrpc.Health.V1b\x06proto3')
 
-
-
-_HEALTHCHECKREQUEST = DESCRIPTOR.message_types_by_name['HealthCheckRequest']
-_HEALTHCHECKRESPONSE = DESCRIPTOR.message_types_by_name['HealthCheckResponse']
-_HEALTHCHECKRESPONSE_SERVINGSTATUS = _HEALTHCHECKRESPONSE.enum_types_by_name['ServingStatus']
-HealthCheckRequest = _reflection.GeneratedProtocolMessageType('HealthCheckRequest', (_message.Message,), {
-  'DESCRIPTOR' : _HEALTHCHECKREQUEST,
-  '__module__' : 'grpclib.health.v1.health_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.health.v1.HealthCheckRequest)
-  })
-_sym_db.RegisterMessage(HealthCheckRequest)
-
-HealthCheckResponse = _reflection.GeneratedProtocolMessageType('HealthCheckResponse', (_message.Message,), {
-  'DESCRIPTOR' : _HEALTHCHECKRESPONSE,
-  '__module__' : 'grpclib.health.v1.health_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.health.v1.HealthCheckResponse)
-  })
-_sym_db.RegisterMessage(HealthCheckResponse)
-
-_HEALTH = DESCRIPTOR.services_by_name['Health']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'grpclib.health.v1.health_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
   DESCRIPTOR._serialized_options = b'\n\021io.grpc.health.v1B\013HealthProtoP\001Z,google.golang.org/grpc/health/grpc_health_v1\252\002\016Grpc.Health.V1'
-  _HEALTHCHECKREQUEST._serialized_start=50
-  _HEALTHCHECKREQUEST._serialized_end=87
-  _HEALTHCHECKRESPONSE._serialized_start=90
-  _HEALTHCHECKRESPONSE._serialized_end=259
-  _HEALTHCHECKRESPONSE_SERVINGSTATUS._serialized_start=180
-  _HEALTHCHECKRESPONSE_SERVINGSTATUS._serialized_end=259
-  _HEALTH._serialized_start=262
-  _HEALTH._serialized_end=436
+  _globals['_HEALTHCHECKREQUEST']._serialized_start=50
+  _globals['_HEALTHCHECKREQUEST']._serialized_end=87
+  _globals['_HEALTHCHECKRESPONSE']._serialized_start=90
+  _globals['_HEALTHCHECKRESPONSE']._serialized_end=259
+  _globals['_HEALTHCHECKRESPONSE_SERVINGSTATUS']._serialized_start=180
+  _globals['_HEALTHCHECKRESPONSE_SERVINGSTATUS']._serialized_end=259
+  _globals['_HEALTH']._serialized_start=262
+  _globals['_HEALTH']._serialized_end=436
 # @@protoc_insertion_point(module_scope)
diff --git a/grpclib/reflection/v1/reflection_pb2.py b/grpclib/reflection/v1/reflection_pb2.py
index dce8e72..f9e9042 100644
--- a/grpclib/reflection/v1/reflection_pb2.py
+++ b/grpclib/reflection/v1/reflection_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -16,93 +15,29 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n&grpclib/reflection/v1/reflection.proto\x12\x12grpc.reflection.v1\"\x85\x02\n\x17ServerReflectionRequest\x12\x0c\n\x04host\x18\x01 \x01(\t\x12\x1a\n\x10\x66ile_by_filename\x18\x03 \x01(\tH\x00\x12 \n\x16\x66ile_containing_symbol\x18\x04 \x01(\tH\x00\x12I\n\x19\x66ile_containing_extension\x18\x05 \x01(\x0b\x32$.grpc.reflection.v1.ExtensionRequestH\x00\x12\'\n\x1d\x61ll_extension_numbers_of_type\x18\x06 \x01(\tH\x00\x12\x17\n\rlist_services\x18\x07 \x01(\tH\x00\x42\x11\n\x0fmessage_request\"E\n\x10\x45xtensionRequest\x12\x17\n\x0f\x63ontaining_type\x18\x01 \x01(\t\x12\x18\n\x10\x65xtension_number\x18\x02 \x01(\x05\"\xb8\x03\n\x18ServerReflectionResponse\x12\x12\n\nvalid_host\x18\x01 \x01(\t\x12\x45\n\x10original_request\x18\x02 \x01(\x0b\x32+.grpc.reflection.v1.ServerReflectionRequest\x12N\n\x18\x66ile_descriptor_response\x18\x04 \x01(\x0b\x32*.grpc.reflection.v1.FileDescriptorResponseH\x00\x12U\n\x1e\x61ll_extension_numbers_response\x18\x05 \x01(\x0b\x32+.grpc.reflection.v1.ExtensionNumberResponseH\x00\x12I\n\x16list_services_response\x18\x06 \x01(\x0b\x32\'.grpc.reflection.v1.ListServiceResponseH\x00\x12;\n\x0e\x65rror_response\x18\x07 \x01(\x0b\x32!.grpc.reflection.v1.ErrorResponseH\x00\x42\x12\n\x10message_response\"7\n\x16\x46ileDescriptorResponse\x12\x1d\n\x15\x66ile_descriptor_proto\x18\x01 \x03(\x0c\"K\n\x17\x45xtensionNumberResponse\x12\x16\n\x0e\x62\x61se_type_name\x18\x01 \x01(\t\x12\x18\n\x10\x65xtension_number\x18\x02 \x03(\x05\"K\n\x13ListServiceResponse\x12\x34\n\x07service\x18\x01 \x03(\x0b\x32#.grpc.reflection.v1.ServiceResponse\"\x1f\n\x0fServiceResponse\x12\x0c\n\x04name\x18\x01 \x01(\t\":\n\rErrorResponse\x12\x12\n\nerror_code\x18\x01 \x01(\x05\x12\x15\n\rerror_message\x18\x02 \x01(\t2\x89\x01\n\x10ServerReflection\x12u\n\x14ServerReflectionInfo\x12+.grpc.reflection.v1.ServerReflectionRequest\x1a,.grpc.reflection.v1.ServerReflectionResponse(\x01\x30\x01\x42\x66\n\x15io.grpc.reflection.v1B\x15ServerReflectionProtoP\x01Z4google.golang.org/grpc/reflection/grpc_reflection_v1b\x06proto3')
 
-
-
-_SERVERREFLECTIONREQUEST = DESCRIPTOR.message_types_by_name['ServerReflectionRequest']
-_EXTENSIONREQUEST = DESCRIPTOR.message_types_by_name['ExtensionRequest']
-_SERVERREFLECTIONRESPONSE = DESCRIPTOR.message_types_by_name['ServerReflectionResponse']
-_FILEDESCRIPTORRESPONSE = DESCRIPTOR.message_types_by_name['FileDescriptorResponse']
-_EXTENSIONNUMBERRESPONSE = DESCRIPTOR.message_types_by_name['ExtensionNumberResponse']
-_LISTSERVICERESPONSE = DESCRIPTOR.message_types_by_name['ListServiceResponse']
-_SERVICERESPONSE = DESCRIPTOR.message_types_by_name['ServiceResponse']
-_ERRORRESPONSE = DESCRIPTOR.message_types_by_name['ErrorResponse']
-ServerReflectionRequest = _reflection.GeneratedProtocolMessageType('ServerReflectionRequest', (_message.Message,), {
-  'DESCRIPTOR' : _SERVERREFLECTIONREQUEST,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ServerReflectionRequest)
-  })
-_sym_db.RegisterMessage(ServerReflectionRequest)
-
-ExtensionRequest = _reflection.GeneratedProtocolMessageType('ExtensionRequest', (_message.Message,), {
-  'DESCRIPTOR' : _EXTENSIONREQUEST,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ExtensionRequest)
-  })
-_sym_db.RegisterMessage(ExtensionRequest)
-
-ServerReflectionResponse = _reflection.GeneratedProtocolMessageType('ServerReflectionResponse', (_message.Message,), {
-  'DESCRIPTOR' : _SERVERREFLECTIONRESPONSE,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ServerReflectionResponse)
-  })
-_sym_db.RegisterMessage(ServerReflectionResponse)
-
-FileDescriptorResponse = _reflection.GeneratedProtocolMessageType('FileDescriptorResponse', (_message.Message,), {
-  'DESCRIPTOR' : _FILEDESCRIPTORRESPONSE,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.FileDescriptorResponse)
-  })
-_sym_db.RegisterMessage(FileDescriptorResponse)
-
-ExtensionNumberResponse = _reflection.GeneratedProtocolMessageType('ExtensionNumberResponse', (_message.Message,), {
-  'DESCRIPTOR' : _EXTENSIONNUMBERRESPONSE,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ExtensionNumberResponse)
-  })
-_sym_db.RegisterMessage(ExtensionNumberResponse)
-
-ListServiceResponse = _reflection.GeneratedProtocolMessageType('ListServiceResponse', (_message.Message,), {
-  'DESCRIPTOR' : _LISTSERVICERESPONSE,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ListServiceResponse)
-  })
-_sym_db.RegisterMessage(ListServiceResponse)
-
-ServiceResponse = _reflection.GeneratedProtocolMessageType('ServiceResponse', (_message.Message,), {
-  'DESCRIPTOR' : _SERVICERESPONSE,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ServiceResponse)
-  })
-_sym_db.RegisterMessage(ServiceResponse)
-
-ErrorResponse = _reflection.GeneratedProtocolMessageType('ErrorResponse', (_message.Message,), {
-  'DESCRIPTOR' : _ERRORRESPONSE,
-  '__module__' : 'grpclib.reflection.v1.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1.ErrorResponse)
-  })
-_sym_db.RegisterMessage(ErrorResponse)
-
-_SERVERREFLECTION = DESCRIPTOR.services_by_name['ServerReflection']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'grpclib.reflection.v1.reflection_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
   DESCRIPTOR._serialized_options = b'\n\025io.grpc.reflection.v1B\025ServerReflectionProtoP\001Z4google.golang.org/grpc/reflection/grpc_reflection_v1'
-  _SERVERREFLECTIONREQUEST._serialized_start=63
-  _SERVERREFLECTIONREQUEST._serialized_end=324
-  _EXTENSIONREQUEST._serialized_start=326
-  _EXTENSIONREQUEST._serialized_end=395
-  _SERVERREFLECTIONRESPONSE._serialized_start=398
-  _SERVERREFLECTIONRESPONSE._serialized_end=838
-  _FILEDESCRIPTORRESPONSE._serialized_start=840
-  _FILEDESCRIPTORRESPONSE._serialized_end=895
-  _EXTENSIONNUMBERRESPONSE._serialized_start=897
-  _EXTENSIONNUMBERRESPONSE._serialized_end=972
-  _LISTSERVICERESPONSE._serialized_start=974
-  _LISTSERVICERESPONSE._serialized_end=1049
-  _SERVICERESPONSE._serialized_start=1051
-  _SERVICERESPONSE._serialized_end=1082
-  _ERRORRESPONSE._serialized_start=1084
-  _ERRORRESPONSE._serialized_end=1142
-  _SERVERREFLECTION._serialized_start=1145
-  _SERVERREFLECTION._serialized_end=1282
+  _globals['_SERVERREFLECTIONREQUEST']._serialized_start=63
+  _globals['_SERVERREFLECTIONREQUEST']._serialized_end=324
+  _globals['_EXTENSIONREQUEST']._serialized_start=326
+  _globals['_EXTENSIONREQUEST']._serialized_end=395
+  _globals['_SERVERREFLECTIONRESPONSE']._serialized_start=398
+  _globals['_SERVERREFLECTIONRESPONSE']._serialized_end=838
+  _globals['_FILEDESCRIPTORRESPONSE']._serialized_start=840
+  _globals['_FILEDESCRIPTORRESPONSE']._serialized_end=895
+  _globals['_EXTENSIONNUMBERRESPONSE']._serialized_start=897
+  _globals['_EXTENSIONNUMBERRESPONSE']._serialized_end=972
+  _globals['_LISTSERVICERESPONSE']._serialized_start=974
+  _globals['_LISTSERVICERESPONSE']._serialized_end=1049
+  _globals['_SERVICERESPONSE']._serialized_start=1051
+  _globals['_SERVICERESPONSE']._serialized_end=1082
+  _globals['_ERRORRESPONSE']._serialized_start=1084
+  _globals['_ERRORRESPONSE']._serialized_end=1142
+  _globals['_SERVERREFLECTION']._serialized_start=1145
+  _globals['_SERVERREFLECTION']._serialized_end=1282
 # @@protoc_insertion_point(module_scope)
diff --git a/grpclib/reflection/v1alpha/reflection_pb2.py b/grpclib/reflection/v1alpha/reflection_pb2.py
index ed7c0ea..7ebfa73 100644
--- a/grpclib/reflection/v1alpha/reflection_pb2.py
+++ b/grpclib/reflection/v1alpha/reflection_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -16,93 +15,29 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n+grpclib/reflection/v1alpha/reflection.proto\x12\x17grpc.reflection.v1alpha\"\x8a\x02\n\x17ServerReflectionRequest\x12\x0c\n\x04host\x18\x01 \x01(\t\x12\x1a\n\x10\x66ile_by_filename\x18\x03 \x01(\tH\x00\x12 \n\x16\x66ile_containing_symbol\x18\x04 \x01(\tH\x00\x12N\n\x19\x66ile_containing_extension\x18\x05 \x01(\x0b\x32).grpc.reflection.v1alpha.ExtensionRequestH\x00\x12\'\n\x1d\x61ll_extension_numbers_of_type\x18\x06 \x01(\tH\x00\x12\x17\n\rlist_services\x18\x07 \x01(\tH\x00\x42\x11\n\x0fmessage_request\"E\n\x10\x45xtensionRequest\x12\x17\n\x0f\x63ontaining_type\x18\x01 \x01(\t\x12\x18\n\x10\x65xtension_number\x18\x02 \x01(\x05\"\xd1\x03\n\x18ServerReflectionResponse\x12\x12\n\nvalid_host\x18\x01 \x01(\t\x12J\n\x10original_request\x18\x02 \x01(\x0b\x32\x30.grpc.reflection.v1alpha.ServerReflectionRequest\x12S\n\x18\x66ile_descriptor_response\x18\x04 \x01(\x0b\x32/.grpc.reflection.v1alpha.FileDescriptorResponseH\x00\x12Z\n\x1e\x61ll_extension_numbers_response\x18\x05 \x01(\x0b\x32\x30.grpc.reflection.v1alpha.ExtensionNumberResponseH\x00\x12N\n\x16list_services_response\x18\x06 \x01(\x0b\x32,.grpc.reflection.v1alpha.ListServiceResponseH\x00\x12@\n\x0e\x65rror_response\x18\x07 \x01(\x0b\x32&.grpc.reflection.v1alpha.ErrorResponseH\x00\x42\x12\n\x10message_response\"7\n\x16\x46ileDescriptorResponse\x12\x1d\n\x15\x66ile_descriptor_proto\x18\x01 \x03(\x0c\"K\n\x17\x45xtensionNumberResponse\x12\x16\n\x0e\x62\x61se_type_name\x18\x01 \x01(\t\x12\x18\n\x10\x65xtension_number\x18\x02 \x03(\x05\"P\n\x13ListServiceResponse\x12\x39\n\x07service\x18\x01 \x03(\x0b\x32(.grpc.reflection.v1alpha.ServiceResponse\"\x1f\n\x0fServiceResponse\x12\x0c\n\x04name\x18\x01 \x01(\t\":\n\rErrorResponse\x12\x12\n\nerror_code\x18\x01 \x01(\x05\x12\x15\n\rerror_message\x18\x02 \x01(\t2\x93\x01\n\x10ServerReflection\x12\x7f\n\x14ServerReflectionInfo\x12\x30.grpc.reflection.v1alpha.ServerReflectionRequest\x1a\x31.grpc.reflection.v1alpha.ServerReflectionResponse(\x01\x30\x01\x42\x38\n\x1aio.grpc.reflection.v1alphaB\x15ServerReflectionProtoP\x01\xb8\x01\x01\x62\x06proto3')
 
-
-
-_SERVERREFLECTIONREQUEST = DESCRIPTOR.message_types_by_name['ServerReflectionRequest']
-_EXTENSIONREQUEST = DESCRIPTOR.message_types_by_name['ExtensionRequest']
-_SERVERREFLECTIONRESPONSE = DESCRIPTOR.message_types_by_name['ServerReflectionResponse']
-_FILEDESCRIPTORRESPONSE = DESCRIPTOR.message_types_by_name['FileDescriptorResponse']
-_EXTENSIONNUMBERRESPONSE = DESCRIPTOR.message_types_by_name['ExtensionNumberResponse']
-_LISTSERVICERESPONSE = DESCRIPTOR.message_types_by_name['ListServiceResponse']
-_SERVICERESPONSE = DESCRIPTOR.message_types_by_name['ServiceResponse']
-_ERRORRESPONSE = DESCRIPTOR.message_types_by_name['ErrorResponse']
-ServerReflectionRequest = _reflection.GeneratedProtocolMessageType('ServerReflectionRequest', (_message.Message,), {
-  'DESCRIPTOR' : _SERVERREFLECTIONREQUEST,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ServerReflectionRequest)
-  })
-_sym_db.RegisterMessage(ServerReflectionRequest)
-
-ExtensionRequest = _reflection.GeneratedProtocolMessageType('ExtensionRequest', (_message.Message,), {
-  'DESCRIPTOR' : _EXTENSIONREQUEST,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ExtensionRequest)
-  })
-_sym_db.RegisterMessage(ExtensionRequest)
-
-ServerReflectionResponse = _reflection.GeneratedProtocolMessageType('ServerReflectionResponse', (_message.Message,), {
-  'DESCRIPTOR' : _SERVERREFLECTIONRESPONSE,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ServerReflectionResponse)
-  })
-_sym_db.RegisterMessage(ServerReflectionResponse)
-
-FileDescriptorResponse = _reflection.GeneratedProtocolMessageType('FileDescriptorResponse', (_message.Message,), {
-  'DESCRIPTOR' : _FILEDESCRIPTORRESPONSE,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.FileDescriptorResponse)
-  })
-_sym_db.RegisterMessage(FileDescriptorResponse)
-
-ExtensionNumberResponse = _reflection.GeneratedProtocolMessageType('ExtensionNumberResponse', (_message.Message,), {
-  'DESCRIPTOR' : _EXTENSIONNUMBERRESPONSE,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ExtensionNumberResponse)
-  })
-_sym_db.RegisterMessage(ExtensionNumberResponse)
-
-ListServiceResponse = _reflection.GeneratedProtocolMessageType('ListServiceResponse', (_message.Message,), {
-  'DESCRIPTOR' : _LISTSERVICERESPONSE,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ListServiceResponse)
-  })
-_sym_db.RegisterMessage(ListServiceResponse)
-
-ServiceResponse = _reflection.GeneratedProtocolMessageType('ServiceResponse', (_message.Message,), {
-  'DESCRIPTOR' : _SERVICERESPONSE,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ServiceResponse)
-  })
-_sym_db.RegisterMessage(ServiceResponse)
-
-ErrorResponse = _reflection.GeneratedProtocolMessageType('ErrorResponse', (_message.Message,), {
-  'DESCRIPTOR' : _ERRORRESPONSE,
-  '__module__' : 'grpclib.reflection.v1alpha.reflection_pb2'
-  # @@protoc_insertion_point(class_scope:grpc.reflection.v1alpha.ErrorResponse)
-  })
-_sym_db.RegisterMessage(ErrorResponse)
-
-_SERVERREFLECTION = DESCRIPTOR.services_by_name['ServerReflection']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'grpclib.reflection.v1alpha.reflection_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
   DESCRIPTOR._serialized_options = b'\n\032io.grpc.reflection.v1alphaB\025ServerReflectionProtoP\001\270\001\001'
-  _SERVERREFLECTIONREQUEST._serialized_start=73
-  _SERVERREFLECTIONREQUEST._serialized_end=339
-  _EXTENSIONREQUEST._serialized_start=341
-  _EXTENSIONREQUEST._serialized_end=410
-  _SERVERREFLECTIONRESPONSE._serialized_start=413
-  _SERVERREFLECTIONRESPONSE._serialized_end=878
-  _FILEDESCRIPTORRESPONSE._serialized_start=880
-  _FILEDESCRIPTORRESPONSE._serialized_end=935
-  _EXTENSIONNUMBERRESPONSE._serialized_start=937
-  _EXTENSIONNUMBERRESPONSE._serialized_end=1012
-  _LISTSERVICERESPONSE._serialized_start=1014
-  _LISTSERVICERESPONSE._serialized_end=1094
-  _SERVICERESPONSE._serialized_start=1096
-  _SERVICERESPONSE._serialized_end=1127
-  _ERRORRESPONSE._serialized_start=1129
-  _ERRORRESPONSE._serialized_end=1187
-  _SERVERREFLECTION._serialized_start=1190
-  _SERVERREFLECTION._serialized_end=1337
+  _globals['_SERVERREFLECTIONREQUEST']._serialized_start=73
+  _globals['_SERVERREFLECTIONREQUEST']._serialized_end=339
+  _globals['_EXTENSIONREQUEST']._serialized_start=341
+  _globals['_EXTENSIONREQUEST']._serialized_end=410
+  _globals['_SERVERREFLECTIONRESPONSE']._serialized_start=413
+  _globals['_SERVERREFLECTIONRESPONSE']._serialized_end=878
+  _globals['_FILEDESCRIPTORRESPONSE']._serialized_start=880
+  _globals['_FILEDESCRIPTORRESPONSE']._serialized_end=935
+  _globals['_EXTENSIONNUMBERRESPONSE']._serialized_start=937
+  _globals['_EXTENSIONNUMBERRESPONSE']._serialized_end=1012
+  _globals['_LISTSERVICERESPONSE']._serialized_start=1014
+  _globals['_LISTSERVICERESPONSE']._serialized_end=1094
+  _globals['_SERVICERESPONSE']._serialized_start=1096
+  _globals['_SERVICERESPONSE']._serialized_end=1127
+  _globals['_ERRORRESPONSE']._serialized_start=1129
+  _globals['_ERRORRESPONSE']._serialized_end=1187
+  _globals['_SERVERREFLECTION']._serialized_start=1190
+  _globals['_SERVERREFLECTION']._serialized_end=1337
 # @@protoc_insertion_point(module_scope)
diff --git a/requirements/check.txt b/requirements/check.txt
index e6dda74..4ea9bb3 100644
--- a/requirements/check.txt
+++ b/requirements/check.txt
@@ -6,9 +6,9 @@
 #
 certifi==2023.7.22        # via -r requirements/runtime.in
 flake8==5.0.4             # via -r requirements/check.in
-googleapis-common-protos==1.59.1  # via -r requirements/runtime.in
-grpcio==1.56.2            # via grpcio-tools
-grpcio-tools==1.56.2      # via -r requirements/check.in
+googleapis-common-protos==1.60.0  # via -r requirements/runtime.in
+grpcio==1.59.0            # via grpcio-tools
+grpcio-tools==1.59.0      # via -r requirements/check.in
 h2==4.1.0                 # via -r requirements/../setup.txt
 hpack==4.0.0              # via -r requirements/../setup.txt, h2
 hyperframe==6.0.1         # via -r requirements/../setup.txt, h2
@@ -18,13 +18,13 @@ multidict==6.0.4          # via -r requirements/../setup.txt
 mypy==1.4.1               # via -r requirements/check.in
 mypy-extensions==1.0.0    # via mypy
 mypy-protobuf==3.4.0      # via -r requirements/check.in
-protobuf==4.23.4          # via -r requirements/runtime.in, googleapis-common-protos, grpcio-tools, mypy-protobuf
+protobuf==4.24.3          # via -r requirements/runtime.in, googleapis-common-protos, grpcio-tools, mypy-protobuf
 pycodestyle==2.9.1        # via flake8
 pyflakes==2.5.0           # via flake8
 tomli==2.0.1              # via mypy
 typed-ast==1.5.5          # via mypy
 types-certifi==2021.10.8.3  # via -r requirements/check.in
-types-protobuf==4.23.0.2  # via mypy-protobuf
+types-protobuf==4.24.0.2  # via mypy-protobuf
 typing-extensions==4.7.1  # via importlib-metadata, mypy
 zipp==3.15.0              # via importlib-metadata
 
diff --git a/requirements/docs.txt b/requirements/docs.txt
index a0c1f5b..1c3d6ab 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -7,9 +7,9 @@
 alabaster==0.7.13         # via sphinx
 babel==2.12.1             # via sphinx
 certifi==2023.7.22        # via -r requirements/runtime.in, requests
-charset-normalizer==3.2.0  # via requests
+charset-normalizer==3.3.0  # via requests
 docutils==0.18.1          # via sphinx, sphinx-rtd-theme
-googleapis-common-protos==1.59.1  # via -r requirements/runtime.in
+googleapis-common-protos==1.60.0  # via -r requirements/runtime.in
 h2==4.1.0                 # via -r requirements/../setup.txt
 hpack==4.0.0              # via -r requirements/../setup.txt, h2
 hyperframe==6.0.1         # via -r requirements/../setup.txt, h2
@@ -19,14 +19,14 @@ importlib-metadata==6.7.0  # via sphinx
 jinja2==3.1.2             # via sphinx
 markupsafe==2.1.3         # via jinja2
 multidict==6.0.4          # via -r requirements/../setup.txt
-packaging==23.1           # via sphinx
-protobuf==4.23.4          # via -r requirements/runtime.in, googleapis-common-protos
-pygments==2.15.1          # via sphinx
-pytz==2023.3              # via babel
+packaging==23.2           # via sphinx
+protobuf==4.24.3          # via -r requirements/runtime.in, googleapis-common-protos
+pygments==2.16.1          # via sphinx
+pytz==2023.3.post1        # via babel
 requests==2.31.0          # via sphinx
 snowballstemmer==2.2.0    # via sphinx
 sphinx==5.3.0             # via -r requirements/docs.in, sphinx-rtd-theme, sphinxcontrib-jquery
-sphinx-rtd-theme==1.2.2   # via -r requirements/docs.in
+sphinx-rtd-theme==1.3.0   # via -r requirements/docs.in
 sphinxcontrib-applehelp==1.0.2  # via sphinx
 sphinxcontrib-devhelp==1.0.2  # via sphinx
 sphinxcontrib-htmlhelp==2.0.0  # via sphinx
@@ -35,5 +35,5 @@ sphinxcontrib-jsmath==1.0.1  # via sphinx
 sphinxcontrib-qthelp==1.0.3  # via sphinx
 sphinxcontrib-serializinghtml==1.1.5  # via sphinx
 typing-extensions==4.7.1  # via importlib-metadata
-urllib3==2.0.4            # via requests
+urllib3==2.0.6            # via requests
 zipp==3.15.0              # via importlib-metadata
diff --git a/requirements/release.txt b/requirements/release.txt
index 44d965a..5ff3480 100644
--- a/requirements/release.txt
+++ b/requirements/release.txt
@@ -7,11 +7,11 @@
 bleach==6.0.0             # via readme-renderer
 certifi==2023.7.22        # via requests
 cffi==1.15.1              # via cryptography
-charset-normalizer==3.2.0  # via requests
-cryptography==41.0.2      # via secretstorage
+charset-normalizer==3.3.0  # via requests
+cryptography==41.0.4      # via secretstorage
 docutils==0.20.1          # via readme-renderer
-grpcio==1.56.2            # via grpcio-tools
-grpcio-tools==1.56.2      # via -r requirements/release.in
+grpcio==1.59.0            # via grpcio-tools
+grpcio-tools==1.59.0      # via -r requirements/release.in
 h2==4.1.0                 # via -r requirements/../setup.txt
 hpack==4.0.0              # via -r requirements/../setup.txt, h2
 hyperframe==6.0.1         # via -r requirements/../setup.txt, h2
@@ -27,20 +27,20 @@ more-itertools==9.1.0     # via jaraco-classes
 multidict==6.0.4          # via -r requirements/../setup.txt
 mypy-protobuf==3.4.0      # via -r requirements/release.in
 pkginfo==1.9.6            # via twine
-protobuf==4.23.4          # via grpcio-tools, mypy-protobuf
+protobuf==4.24.3          # via grpcio-tools, mypy-protobuf
 pycparser==2.21           # via cffi
-pygments==2.15.1          # via readme-renderer, rich
+pygments==2.16.1          # via readme-renderer, rich
 readme-renderer==37.3     # via twine
 requests==2.31.0          # via requests-toolbelt, twine
 requests-toolbelt==1.0.0  # via twine
 rfc3986==2.0.0            # via twine
-rich==13.4.2              # via twine
+rich==13.6.0              # via twine
 secretstorage==3.3.3      # via keyring
 six==1.16.0               # via bleach
 twine==4.0.2              # via -r requirements/release.in
-types-protobuf==4.23.0.2  # via mypy-protobuf
+types-protobuf==4.24.0.2  # via mypy-protobuf
 typing-extensions==4.7.1  # via importlib-metadata, markdown-it-py, rich
-urllib3==2.0.4            # via requests, twine
+urllib3==2.0.6            # via requests, twine
 webencodings==0.5.1       # via bleach
 zipp==3.15.0              # via importlib-metadata, importlib-resources
 
diff --git a/requirements/runtime.txt b/requirements/runtime.txt
index 07a6e05..6f08996 100644
--- a/requirements/runtime.txt
+++ b/requirements/runtime.txt
@@ -5,9 +5,9 @@
 #    pip-compile --annotation-style=line --config=pyproject.toml requirements/runtime.in
 #
 certifi==2023.7.22        # via -r requirements/runtime.in
-googleapis-common-protos==1.59.1  # via -r requirements/runtime.in
+googleapis-common-protos==1.60.0  # via -r requirements/runtime.in
 h2==4.1.0                 # via -r requirements/../setup.txt
 hpack==4.0.0              # via -r requirements/../setup.txt, h2
 hyperframe==6.0.1         # via -r requirements/../setup.txt, h2
 multidict==6.0.4          # via -r requirements/../setup.txt
-protobuf==4.23.4          # via -r requirements/runtime.in, googleapis-common-protos
+protobuf==4.24.3          # via -r requirements/runtime.in, googleapis-common-protos
diff --git a/requirements/test.txt b/requirements/test.txt
index 1a65c4d..ec601bc 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -4,22 +4,22 @@
 #
 #    pip-compile --annotation-style=line --config=pyproject.toml requirements/test.in
 #
-async-timeout==4.0.2      # via -r requirements/test.in
+async-timeout==4.0.3      # via -r requirements/test.in
 certifi==2023.7.22        # via -r requirements/runtime.in
 coverage[toml]==7.2.7     # via pytest-cov
-exceptiongroup==1.1.2     # via pytest
+exceptiongroup==1.1.3     # via pytest
 faker==18.13.0            # via -r requirements/test.in
-googleapis-common-protos==1.59.1  # via -r requirements/runtime.in
+googleapis-common-protos==1.60.0  # via -r requirements/runtime.in
 h2==4.1.0                 # via -r requirements/../setup.txt
 hpack==4.0.0              # via -r requirements/../setup.txt, h2
 hyperframe==6.0.1         # via -r requirements/../setup.txt, h2
 importlib-metadata==6.7.0  # via pluggy, pytest
 iniconfig==2.0.0          # via pytest
 multidict==6.0.4          # via -r requirements/../setup.txt
-packaging==23.1           # via pytest
+packaging==23.2           # via pytest
 pluggy==1.2.0             # via pytest
-protobuf==4.23.4          # via -r requirements/runtime.in, googleapis-common-protos
-pytest==7.4.0             # via -r requirements/test.in, pytest-asyncio, pytest-cov
+protobuf==4.24.3          # via -r requirements/runtime.in, googleapis-common-protos
+pytest==7.4.2             # via -r requirements/test.in, pytest-asyncio, pytest-cov
 pytest-asyncio==0.21.1    # via -r requirements/test.in
 pytest-cov==4.1.0         # via -r requirements/test.in
 python-dateutil==2.8.2    # via faker
diff --git a/setup.cfg b/setup.cfg
index 9afc3f6..b5bcddb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,7 +33,7 @@ install_requires=
 
 [options.extras_require]
 protobuf =
-    protobuf>=3.15.0
+    protobuf>=3.20.0
 
 [options.entry_points]
 console_scripts =
diff --git a/tests/dummy_pb2.py b/tests/dummy_pb2.py
index a2ed1dc..c909771 100644
--- a/tests/dummy_pb2.py
+++ b/tests/dummy_pb2.py
@@ -4,9 +4,8 @@
 """Generated protocol buffer code."""
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -16,32 +15,16 @@
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0b\x64ummy.proto\x12\x05\x64ummy\"\x1d\n\x0c\x44ummyRequest\x12\r\n\x05value\x18\x01 \x01(\t\"\x1b\n\nDummyReply\x12\r\n\x05value\x18\x01 \x01(\t2\xfa\x01\n\x0c\x44ummyService\x12\x36\n\nUnaryUnary\x12\x13.dummy.DummyRequest\x1a\x11.dummy.DummyReply\"\x00\x12\x39\n\x0bUnaryStream\x12\x13.dummy.DummyRequest\x1a\x11.dummy.DummyReply\"\x00\x30\x01\x12\x39\n\x0bStreamUnary\x12\x13.dummy.DummyRequest\x1a\x11.dummy.DummyReply\"\x00(\x01\x12<\n\x0cStreamStream\x12\x13.dummy.DummyRequest\x1a\x11.dummy.DummyReply\"\x00(\x01\x30\x01\x62\x06proto3')
 
-
-
-_DUMMYREQUEST = DESCRIPTOR.message_types_by_name['DummyRequest']
-_DUMMYREPLY = DESCRIPTOR.message_types_by_name['DummyReply']
-DummyRequest = _reflection.GeneratedProtocolMessageType('DummyRequest', (_message.Message,), {
-  'DESCRIPTOR' : _DUMMYREQUEST,
-  '__module__' : 'dummy_pb2'
-  # @@protoc_insertion_point(class_scope:dummy.DummyRequest)
-  })
-_sym_db.RegisterMessage(DummyRequest)
-
-DummyReply = _reflection.GeneratedProtocolMessageType('DummyReply', (_message.Message,), {
-  'DESCRIPTOR' : _DUMMYREPLY,
-  '__module__' : 'dummy_pb2'
-  # @@protoc_insertion_point(class_scope:dummy.DummyReply)
-  })
-_sym_db.RegisterMessage(DummyReply)
-
-_DUMMYSERVICE = DESCRIPTOR.services_by_name['DummyService']
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'dummy_pb2', _globals)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
   DESCRIPTOR._options = None
-  _DUMMYREQUEST._serialized_start=22
-  _DUMMYREQUEST._serialized_end=51
-  _DUMMYREPLY._serialized_start=53
-  _DUMMYREPLY._serialized_end=80
-  _DUMMYSERVICE._serialized_start=83
-  _DUMMYSERVICE._serialized_end=333
+  _globals['_DUMMYREQUEST']._serialized_start=22
+  _globals['_DUMMYREQUEST']._serialized_end=51
+  _globals['_DUMMYREPLY']._serialized_start=53
+  _globals['_DUMMYREPLY']._serialized_end=80
+  _globals['_DUMMYSERVICE']._serialized_start=83
+  _globals['_DUMMYSERVICE']._serialized_end=333
 # @@protoc_insertion_point(module_scope)