def _handle_header_block(self, headers):
"""
Handles the logic for receiving a completed headers block.
A headers block is an uninterrupted sequence of one HEADERS frame
followed by zero or more CONTINUATION frames, and is terminated by a
frame bearing the END_HEADERS flag.
HTTP/2 allows receipt of up to three such blocks on a stream. The first
is optional, and contains a 1XX response. The second is mandatory, and
must contain a final response (200 or higher). The third is optional,
and may contain 'trailers', headers that are sent after a chunk-encoded
body is sent.
Here we only process the simple state: no push, one header frame.
"""
if self.response_headers is None:
self.response_headers = HTTPHeaderMap(headers)
else:
# Received too many headers blocks.
raise ProtocolError("Too many header blocks.")
status = int(self.response_headers[b':status'][0])
if status in [400, 403]:
# xlog.warn("status:%d host:%s", status, self.host)
self.connection.close("get 40x")
return
def receive_frame(self, frame):
"""
Handle a frame received on this stream.
called by connection.
"""
# self.logger.debug("stream %d recved frame %r", self.stream_id, frame)
if frame.type == WindowUpdateFrame.type:
self.remote_window_size += frame.window_increment
self.send_left_body()
elif frame.type == HeadersFrame.type:
# Begin the header block for the response headers.
#self.response_header_datas = [frame.data]
self.response_header_datas.append(frame.data)
elif frame.type == PushPromiseFrame.type:
self.logger.error("%s receive PushPromiseFrame:%d", self.ip_str,
frame.stream_id)
elif frame.type == ContinuationFrame.type:
# Continue a header block begun with either HEADERS or PUSH_PROMISE.
self.response_header_datas.append(frame.data)
elif frame.type == DataFrame.type:
# Append the data to the buffer.
if not self.task.finished:
self.task.put_data(frame.data)
if 'END_STREAM' not in frame.flags:
# Increase the window size. Only do this if the data frame contains
# actual data.
# don't do it if stream is closed.
size = frame.flow_controlled_length
increment = self.receive_window_manager._handle_frame(size)
#if increment:
# self.logger.debug("stream:%d frame size:%d increase win:%d", self.stream_id, size, increment)
#content_len = int(self.request_headers.get("Content-Length")[0])
#self.logger.debug("%s get:%d s:%d", self.ip, self.response_body_len, size)
if increment and not self._remote_closed:
w = WindowUpdateFrame(self.stream_id)
w.window_increment = increment
self._send_cb(w)
elif frame.type == RstStreamFrame.type:
# Rest Frame send from server is not define in RFC
inactive_time = time.time() - self.connection.last_recv_time
self.logger.debug(
"%s Stream %d Rest by server, inactive:%d. error code:%d",
self.ip_str, self.stream_id, inactive_time, frame.error_code)
self.connection.close("RESET")
elif frame.type in FRAMES:
# This frame isn't valid at this point.
#raise ValueError("Unexpected frame %s." % frame)
self.logger.error("%s Unexpected frame %s.", self.ip_str, frame)
else: # pragma: no cover
# Unknown frames belong to extensions. Just drop it on the
# floor, but log so that users know that something happened.
self.logger.error("%s Received unknown frame, type %d",
self.ip_str, frame.type)
pass
if 'END_HEADERS' in frame.flags:
if self.config.http2_show_debug:
self.logger.debug("END_HEADERS")
if self.response_headers is not None:
raise ProtocolError("Too many header blocks.")
# Begin by decoding the header block. If this fails, we need to
# tear down the entire connection.
if len(self.response_header_datas) == 1:
header_data = self.response_header_datas[0]
else:
header_data = b''.join(self.response_header_datas)
try:
headers = self._decoder.decode(header_data)
except Exception as e:
self.logger.exception("decode h2 header %s fail:%r",
header_data, e)
raise e
self.response_headers = HTTPHeaderMap(headers)
# We've handled the headers, zero them out.
self.response_header_datas = None
self.get_head_time = time.time()
length = self.response_headers.get("Content-Length", None)
if isinstance(length, list):
length = int(length[0])
if not self.task.finished:
self.task.content_length = length
self.task.set_state("h2_get_head")
self.send_response()
if 'END_STREAM' in frame.flags:
if self.config.http2_show_debug:
self.logger.debug("%s Closing remote side of stream:%d",
self.connection.ssl_sock.ip_str,
self.stream_id)
time_now = time.time()
time_cost = time_now - self.get_head_time
if time_cost > 0 and \
isinstance(self.task.content_length, int) and \
not self.task.finished:
speed = self.task.content_length / time_cost
self.task.set_state("h2_finish[SP:%d]" % speed)
self._close_remote()
self.close("end stream")
if not self.task.finished:
self.connection.continue_timeout = 0
