experimental

test/http2_test/http2_base_server.py

+import struct
+import messages_pb2
+import functools
+import argparse
+import logging
+import time
+
+from twisted.internet.defer import Deferred, inlineCallbacks
+from twisted.internet.protocol import Protocol, Factory
+from twisted.internet import endpoints, reactor, error, defer
+from h2.connection import H2Connection
+from h2.events import RequestReceived, DataReceived, WindowUpdated, RemoteSettingsChanged, PingAcknowledged
+from threading import Lock
+
+READ_CHUNK_SIZE = 16384
+GRPC_HEADER_SIZE = 5
+
+class H2ProtocolBaseServer(Protocol):
+  def __init__(self):
+    self._conn = H2Connection(client_side=False)
+    self._recv_buffer = ''
+    self._handlers = {}
+    self._handlers['DataReceived'] = self.on_data_received_default
+    self._handlers['WindowUpdated'] = self.on_window_update_default
+    self._handlers['RequestReceived'] = self.on_request_received_default
+    self._handlers['SendDone'] = self.on_send_done_default
+    self._handlers['ConnectionLost'] = self.on_connection_lost
+    self._handlers['PingAcknowledged'] = self.on_ping_acknowledged_default
+    self._stream_status = {}
+    self._outstanding_pings = 0
+
+  def set_handlers(self, handlers):
+    self._handlers = handlers
+
+  def connectionMade(self):
+    logging.info('Connection Made')
+    self._conn.initiate_connection()
+    self.transport.setTcpNoDelay(True)
+    self.transport.write(self._conn.data_to_send())
+
+  def connectionLost(self, reason):
+    self._handlers['ConnectionLost'](reason)
+
+  def on_connection_lost(self, reason):
+    logging.info('Disconnected %s'%reason)
+    reactor.callFromThread(reactor.stop)
+
+  def dataReceived(self, data):
+    events = self._conn.receive_data(data)
+    if self._conn.data_to_send:
+      self.transport.write(self._conn.data_to_send())
+    for event in events:
+      if isinstance(event, RequestReceived) and self._handlers.has_key('RequestReceived'):
+        logging.info('RequestReceived Event')
+        self._handlers['RequestReceived'](event)
+      elif isinstance(event, DataReceived) and self._handlers.has_key('DataReceived'):
+        logging.info('DataReceived Event')
+        self._handlers['DataReceived'](event)
+      elif isinstance(event, WindowUpdated) and self._handlers.has_key('WindowUpdated'):
+        logging.info('WindowUpdated Event')
+        self._handlers['WindowUpdated'](event)
+      elif isinstance(event, PingAcknowledged) and self._handlers.has_key('PingAcknowledged'):
+        logging.info('PingAcknowledged Event')
+        self._handlers['PingAcknowledged'](event)
+    self.transport.write(self._conn.data_to_send())
+
+  def on_ping_acknowledged_default(self, event):
+    self._outstanding_pings -= 1
+
+  def on_data_received_default(self, event):
+    self._conn.acknowledge_received_data(len(event.data), event.stream_id)
+    self._recv_buffer += event.data
+
+  def on_request_received_default(self, event):
+    self._recv_buffer = ''
+    self._stream_id = event.stream_id
+    self._stream_status[event.stream_id] = True
+    self._conn.send_headers(
+      stream_id=event.stream_id,
+      headers=[
+          (':status', '200'),
+          ('content-type', 'application/grpc'),
+          ('grpc-encoding', 'identity'),
+          ('grpc-accept-encoding', 'identity,deflate,gzip'),
+      ],
+    )
+    self.transport.write(self._conn.data_to_send())
+
+  def on_window_update_default(self, event):
+    pass
+
+  def send_reset_stream(self):
+    self._conn.reset_stream(self._stream_id)
+    self.transport.write(self._conn.data_to_send())
+
+  def setup_send(self, data_to_send):
+    self._send_remaining = len(data_to_send)
+    self._send_offset = 0
+    self._data_to_send = data_to_send
+    self.default_send()
+
+  def default_send(self):
+    while self._send_remaining > 0:
+      lfcw = self._conn.local_flow_control_window(self._stream_id)
+      if lfcw == 0:
+        break
+      chunk_size = min(lfcw, READ_CHUNK_SIZE)
+      bytes_to_send = min(chunk_size, self._send_remaining)
+      logging.info('flow_control_window = %d. sending [%d:%d] stream_id %d'%
+                    (lfcw, self._send_offset, self._send_offset + bytes_to_send,
+                    self._stream_id))
+      data = self._data_to_send[self._send_offset : self._send_offset + bytes_to_send]
+      self._conn.send_data(self._stream_id, data, False)
+      self._send_remaining -= bytes_to_send
+      self._send_offset += bytes_to_send
+      if self._send_remaining == 0:
+        self._handlers['SendDone']()
+
+  def default_ping(self):
+    self._outstanding_pings += 1
+    self._conn.ping(b'\x00'*8)
+    self.transport.write(self._conn.data_to_send())
+
+  def on_send_done_default(self):
+    if self._stream_status[self._stream_id]:
+      self._stream_status[self._stream_id] = False
+      self.default_send_trailer()
+
+  def default_send_trailer(self):
+    logging.info('Sending trailer for stream id %d'%self._stream_id)
+    self._conn.send_headers(self._stream_id,
+      headers=[ ('grpc-status', '0') ],
+      end_stream=True
+    )
+    self.transport.write(self._conn.data_to_send())
+
+  @staticmethod
+  def default_response_data(response_size):
+    sresp = messages_pb2.SimpleResponse()
+    sresp.payload.body = b'\x00'*response_size
+    serialized_resp_proto = sresp.SerializeToString()
+    response_data = b'\x00' + struct.pack('i', len(serialized_resp_proto))[::-1] + serialized_resp_proto
+    return response_data
+
+  @staticmethod
+  def parse_received_data(recv_buffer):
+    """ returns a grpc framed string of bytes containing response proto of the size
+    asked in request """
+    grpc_msg_size = struct.unpack('i',recv_buffer[1:5][::-1])[0]
+    if len(recv_buffer) != GRPC_HEADER_SIZE + grpc_msg_size:
+      logging.error('not enough data to decode req proto. size = %d, needed %s'%(len(recv_buffer), 5+grpc_msg_size))
+      return None
+    req_proto_str = recv_buffer[5:5+grpc_msg_size]
+    sr = messages_pb2.SimpleRequest()
+    sr.ParseFromString(req_proto_str)
+    logging.info('Parsed request: response_size=%s'%sr.response_size)
+    return sr

test/http2_test/http2_test_server.py

+"""
+  HTTP2 Test Server. Highly experimental work in progress.
+"""
+import struct
+import messages_pb2
+import argparse
+import logging
+import time
+
+from twisted.internet.defer import Deferred, inlineCallbacks
+from twisted.internet.protocol import Protocol, Factory
+from twisted.internet import endpoints, reactor, error, defer
+from h2.connection import H2Connection
+from h2.events import RequestReceived, DataReceived, WindowUpdated, RemoteSettingsChanged
+from threading import Lock
+import http2_base_server
+
+READ_CHUNK_SIZE = 16384
+GRPC_HEADER_SIZE = 5
+
+class TestcaseRstStreamAfterHeader(object):
+  def __init__(self):
+    self._base_server = http2_base_server.H2ProtocolBaseServer()
+    self._base_server._handlers['RequestReceived'] = self.on_request_received
+
+  def get_base_server(self):
+    return self._base_server
+
+  def on_request_received(self, event):
+    # send initial headers
+    self._base_server.on_request_received_default(event)
+    # send reset stream
+    self._base_server.send_reset_stream()
+
+class TestcaseRstStreamAfterData(object):
+  def __init__(self):
+    self._base_server = http2_base_server.H2ProtocolBaseServer()
+    self._base_server._handlers['DataReceived'] = self.on_data_received
+
+  def get_base_server(self):
+    return self._base_server
+
+  def on_data_received(self, event):
+    self._base_server.on_data_received_default(event)
+    sr = self._base_server.parse_received_data(self._base_server._recv_buffer)
+    assert(sr is not None)
+    assert(sr.response_size <= 2048) # so it can fit into one flow control window
+    response_data = self._base_server.default_response_data(sr.response_size)
+    self._ready_to_send = True
+    self._base_server.setup_send(response_data)
+    # send reset stream
+    self._base_server.send_reset_stream()
+
+class TestcaseGoaway(object):
+  """ 
+    Process incoming request normally. After sending trailer response,
+    send GOAWAY with stream id = 1.
+    assert that the next request is made on a different connection.
+  """
+  def __init__(self, iteration):
+    self._base_server = http2_base_server.H2ProtocolBaseServer()
+    self._base_server._handlers['RequestReceived'] = self.on_request_received
+    self._base_server._handlers['DataReceived'] = self.on_data_received
+    self._base_server._handlers['WindowUpdated'] = self.on_window_update_default
+    self._base_server._handlers['SendDone'] = self.on_send_done
+    self._base_server._handlers['ConnectionLost'] = self.on_connection_lost
+    self._ready_to_send = False
+    self._iteration = iteration
+
+  def get_base_server(self):
+    return self._base_server
+
+  def on_connection_lost(self, reason):
+    logging.info('Disconnect received. Count %d'%self._iteration)
+    # _iteration == 2 => Two different connections have been used.
+    if self._iteration == 2:
+      self._base_server.on_connection_lost(reason)
+
+  def on_send_done(self):
+    self._base_server.on_send_done_default()
+    if self._base_server._stream_id == 1:
+      logging.info('Sending GOAWAY for stream 1')
+      self._base_server._conn.close_connection(error_code=0, additional_data=None, last_stream_id=1)
+
+  def on_request_received(self, event):
+    self._ready_to_send = False
+    self._base_server.on_request_received_default(event)
+
+  def on_data_received(self, event):
+    self._base_server.on_data_received_default(event)
+    sr = self._base_server.parse_received_data(self._base_server._recv_buffer)
+    if sr:
+      time.sleep(1)
+      logging.info('Creating response size = %s'%sr.response_size)
+      response_data = self._base_server.default_response_data(sr.response_size)
+      self._ready_to_send = True
+      self._base_server.setup_send(response_data)
+
+  def on_window_update_default(self, event):
+    if self._ready_to_send:
+      self._base_server.default_send()
+
+class TestcasePing(object):
+  """ 
+  """
+  def __init__(self, iteration):
+    self._base_server = http2_base_server.H2ProtocolBaseServer()
+    self._base_server._handlers['RequestReceived'] = self.on_request_received
+    self._base_server._handlers['DataReceived'] = self.on_data_received
+    self._base_server._handlers['ConnectionLost'] = self.on_connection_lost
+
+  def get_base_server(self):
+    return self._base_server
+
+  def on_request_received(self, event):
+    self._base_server.default_ping()
+    self._base_server.on_request_received_default(event)
+    self._base_server.default_ping()
+
+  def on_data_received(self, event):
+    self._base_server.on_data_received_default(event)
+    sr = self._base_server.parse_received_data(self._base_server._recv_buffer)
+    logging.info('Creating response size = %s'%sr.response_size)
+    response_data = self._base_server.default_response_data(sr.response_size)
+    self._base_server.default_ping()
+    self._base_server.setup_send(response_data)
+    self._base_server.default_ping()
+
+  def on_connection_lost(self, reason):
+    logging.info('Disconnect received. Ping Count %d'%self._base_server._outstanding_pings)
+    assert(self._base_server._outstanding_pings == 0)
+    self._base_server.on_connection_lost(reason)
+
+class H2Factory(Factory):
+  def __init__(self, testcase):
+    logging.info('In H2Factory')
+    self._num_streams = 0
+    self._testcase = testcase
+
+  def buildProtocol(self, addr):
+    self._num_streams += 1
+    if self._testcase == 'rst_stream_after_header':
+      t = TestcaseRstStreamAfterHeader(self._num_streams)
+    elif self._testcase == 'rst_stream_after_data':
+      t = TestcaseRstStreamAfterData(self._num_streams)
+    elif self._testcase == 'goaway':
+      t = TestcaseGoaway(self._num_streams)
+    elif self._testcase == 'ping':
+      t = TestcasePing(self._num_streams)
+    else:
+      assert(0)
+    return t.get_base_server()
+
+if __name__ == "__main__":
+  logging.basicConfig(format = "%(levelname) -10s %(asctime)s %(module)s:%(lineno)s | %(message)s", level=logging.INFO)
+  parser = argparse.ArgumentParser()
+  parser.add_argument("test")
+  parser.add_argument("port")
+  args = parser.parse_args()
+  if args.test not in ['rst_stream_after_header', 'rst_stream_after_data', 'goaway', 'ping']:
+    print 'unknown test: ', args.test
+  endpoint = endpoints.TCP4ServerEndpoint(reactor, int(args.port), backlog=128)
+  endpoint.listen(H2Factory(args.test))
+  reactor.run()