mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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198 lines
8.2 KiB
198 lines
8.2 KiB
# Copyright 2016 gRPC authors. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import logging |
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import messages_pb2 |
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import struct |
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import h2 |
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import h2.connection |
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import twisted |
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import twisted.internet |
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import twisted.internet.protocol |
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_READ_CHUNK_SIZE = 16384 |
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_GRPC_HEADER_SIZE = 5 |
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_MIN_SETTINGS_MAX_FRAME_SIZE = 16384 |
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class H2ProtocolBaseServer(twisted.internet.protocol.Protocol): |
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def __init__(self): |
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self._conn = h2.connection.H2Connection(client_side=False) |
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self._recv_buffer = {} |
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self._handlers = {} |
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self._handlers['ConnectionMade'] = self.on_connection_made_default |
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self._handlers['DataReceived'] = self.on_data_received_default |
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self._handlers['WindowUpdated'] = self.on_window_update_default |
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self._handlers['RequestReceived'] = self.on_request_received_default |
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self._handlers['SendDone'] = self.on_send_done_default |
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self._handlers['ConnectionLost'] = self.on_connection_lost |
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self._handlers['PingAcknowledged'] = self.on_ping_acknowledged_default |
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self._stream_status = {} |
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self._send_remaining = {} |
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self._outstanding_pings = 0 |
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def set_handlers(self, handlers): |
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self._handlers = handlers |
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def connectionMade(self): |
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self._handlers['ConnectionMade']() |
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def connectionLost(self, reason): |
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self._handlers['ConnectionLost'](reason) |
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def on_connection_made_default(self): |
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logging.info('Connection Made') |
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self._conn.initiate_connection() |
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self.transport.setTcpNoDelay(True) |
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self.transport.write(self._conn.data_to_send()) |
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def on_connection_lost(self, reason): |
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logging.info('Disconnected %s' % reason) |
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def dataReceived(self, data): |
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try: |
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events = self._conn.receive_data(data) |
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except h2.exceptions.ProtocolError: |
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# this try/except block catches exceptions due to race between sending |
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# GOAWAY and processing a response in flight. |
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return |
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if self._conn.data_to_send: |
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self.transport.write(self._conn.data_to_send()) |
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for event in events: |
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if isinstance(event, h2.events.RequestReceived) and self._handlers.has_key('RequestReceived'): |
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logging.info('RequestReceived Event for stream: %d' % event.stream_id) |
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self._handlers['RequestReceived'](event) |
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elif isinstance(event, h2.events.DataReceived) and self._handlers.has_key('DataReceived'): |
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logging.info('DataReceived Event for stream: %d' % event.stream_id) |
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self._handlers['DataReceived'](event) |
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elif isinstance(event, h2.events.WindowUpdated) and self._handlers.has_key('WindowUpdated'): |
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logging.info('WindowUpdated Event for stream: %d' % event.stream_id) |
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self._handlers['WindowUpdated'](event) |
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elif isinstance(event, h2.events.PingAcknowledged) and self._handlers.has_key('PingAcknowledged'): |
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logging.info('PingAcknowledged Event') |
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self._handlers['PingAcknowledged'](event) |
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self.transport.write(self._conn.data_to_send()) |
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def on_ping_acknowledged_default(self, event): |
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logging.info('ping acknowledged') |
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self._outstanding_pings -= 1 |
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def on_data_received_default(self, event): |
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self._conn.acknowledge_received_data(len(event.data), event.stream_id) |
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self._recv_buffer[event.stream_id] += event.data |
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def on_request_received_default(self, event): |
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self._recv_buffer[event.stream_id] = '' |
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self._stream_id = event.stream_id |
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self._stream_status[event.stream_id] = True |
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self._conn.send_headers( |
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stream_id=event.stream_id, |
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headers=[ |
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(':status', '200'), |
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('content-type', 'application/grpc'), |
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('grpc-encoding', 'identity'), |
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('grpc-accept-encoding', 'identity,deflate,gzip'), |
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], |
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) |
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self.transport.write(self._conn.data_to_send()) |
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def on_window_update_default(self, _, pad_length=None, read_chunk_size=_READ_CHUNK_SIZE): |
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# try to resume sending on all active streams (update might be for connection) |
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for stream_id in self._send_remaining: |
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self.default_send(stream_id, pad_length=pad_length, read_chunk_size=read_chunk_size) |
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def send_reset_stream(self): |
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self._conn.reset_stream(self._stream_id) |
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self.transport.write(self._conn.data_to_send()) |
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def setup_send(self, data_to_send, stream_id, pad_length=None, read_chunk_size=_READ_CHUNK_SIZE): |
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logging.info('Setting up data to send for stream_id: %d' % stream_id) |
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self._send_remaining[stream_id] = len(data_to_send) |
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self._send_offset = 0 |
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self._data_to_send = data_to_send |
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self.default_send(stream_id, pad_length=pad_length, read_chunk_size=read_chunk_size) |
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def default_send(self, stream_id, pad_length=None, read_chunk_size=_READ_CHUNK_SIZE): |
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if not self._send_remaining.has_key(stream_id): |
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# not setup to send data yet |
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return |
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while self._send_remaining[stream_id] > 0: |
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lfcw = self._conn.local_flow_control_window(stream_id) |
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padding_bytes = pad_length + 1 if pad_length is not None else 0 |
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if lfcw - padding_bytes <= 0: |
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logging.info('Stream %d. lfcw: %d. padding bytes: %d. not enough quota yet' % (stream_id, lfcw, padding_bytes)) |
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break |
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chunk_size = min(lfcw - padding_bytes, read_chunk_size) |
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bytes_to_send = min(chunk_size, self._send_remaining[stream_id]) |
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logging.info('flow_control_window = %d. sending [%d:%d] stream_id %d. includes %d total padding bytes' % |
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(lfcw, self._send_offset, self._send_offset + bytes_to_send + padding_bytes, |
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stream_id, padding_bytes)) |
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# The receiver might allow sending frames larger than the http2 minimum |
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# max frame size (16384), but this test should never send more than 16384 |
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# for simplicity (which is always legal). |
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if bytes_to_send + padding_bytes > _MIN_SETTINGS_MAX_FRAME_SIZE: |
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raise ValueError("overload: sending %d" % (bytes_to_send + padding_bytes)) |
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data = self._data_to_send[self._send_offset : self._send_offset + bytes_to_send] |
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try: |
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self._conn.send_data(stream_id, data, end_stream=False, pad_length=pad_length) |
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except h2.exceptions.ProtocolError: |
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logging.info('Stream %d is closed' % stream_id) |
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break |
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self._send_remaining[stream_id] -= bytes_to_send |
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self._send_offset += bytes_to_send |
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if self._send_remaining[stream_id] == 0: |
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self._handlers['SendDone'](stream_id) |
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def default_ping(self): |
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logging.info('sending ping') |
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self._outstanding_pings += 1 |
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self._conn.ping(b'\x00'*8) |
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self.transport.write(self._conn.data_to_send()) |
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def on_send_done_default(self, stream_id): |
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if self._stream_status[stream_id]: |
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self._stream_status[stream_id] = False |
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self.default_send_trailer(stream_id) |
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else: |
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logging.error('Stream %d is already closed' % stream_id) |
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def default_send_trailer(self, stream_id): |
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logging.info('Sending trailer for stream id %d' % stream_id) |
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self._conn.send_headers(stream_id, |
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headers=[ ('grpc-status', '0') ], |
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end_stream=True |
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) |
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self.transport.write(self._conn.data_to_send()) |
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@staticmethod |
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def default_response_data(response_size): |
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sresp = messages_pb2.SimpleResponse() |
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sresp.payload.body = b'\x00'*response_size |
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serialized_resp_proto = sresp.SerializeToString() |
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response_data = b'\x00' + struct.pack('i', len(serialized_resp_proto))[::-1] + serialized_resp_proto |
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return response_data |
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def parse_received_data(self, stream_id): |
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""" returns a grpc framed string of bytes containing response proto of the size |
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asked in request """ |
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recv_buffer = self._recv_buffer[stream_id] |
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grpc_msg_size = struct.unpack('i',recv_buffer[1:5][::-1])[0] |
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if len(recv_buffer) != _GRPC_HEADER_SIZE + grpc_msg_size: |
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return None |
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req_proto_str = recv_buffer[5:5+grpc_msg_size] |
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sr = messages_pb2.SimpleRequest() |
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sr.ParseFromString(req_proto_str) |
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logging.info('Parsed simple request for stream %d' % stream_id) |
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return sr
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