def write_headers(self, start_line, headers, chunk=None, callback=None):
"""Implements `.HTTPConnection.write_headers`."""
if self.is_client:
self._request_start_line = start_line
# Client requests with a non-empty body must have either a
# Content-Length or a Transfer-Encoding.
self._chunking_output = (start_line.method
in ('POST', 'PUT', 'PATCH')
and 'Content-Length' not in headers
and 'Transfer-Encoding' not in headers)
else:
self._response_start_line = start_line
self._chunking_output = (
# TODO: should this use
# self._request_start_line.version or
# start_line.version?
self._request_start_line.version == 'HTTP/1.1' and
# 304 responses have no body (not even a zero-length body), and so
# should not have either Content-Length or Transfer-Encoding.
# headers.
start_line.code != 304 and
# No need to chunk the output if a Content-Length is specified.
'Content-Length' not in headers and
# Applications are discouraged from touching Transfer-Encoding,
# but if they do, leave it alone.
'Transfer-Encoding' not in headers)
# If a 1.0 client asked for keep-alive, add the header.
if (self._request_start_line.version == 'HTTP/1.0'
and (self._request_headers.get('Connection', '').lower()
== 'keep-alive')):
headers['Connection'] = 'Keep-Alive'
if self._chunking_output:
headers['Transfer-Encoding'] = 'chunked'
if (not self.is_client and (self._request_start_line.method == 'HEAD'
or start_line.code == 304)):
self._expected_content_remaining = 0
elif 'Content-Length' in headers:
self._expected_content_remaining = int(headers['Content-Length'])
else:
self._expected_content_remaining = None
lines = [utf8("%s %s %s" % start_line)]
lines.extend([utf8(n) + b": " + utf8(v) for n, v in headers.get_all()])
for line in lines:
if b'\n' in line:
raise ValueError('Newline in header: ' + repr(line))
future = None
if self.stream.closed():
future = self._write_future = Future()
future.set_exception(iostream.StreamClosedError())
else:
if callback is not None:
self._write_callback = stack_context.wrap(callback)
else:
future = self._write_future = Future()
data = b"\r\n".join(lines) + b"\r\n\r\n"
if chunk:
data += self._format_chunk(chunk)
self._pending_write = self.stream.write(data)
self._pending_write.add_done_callback(self._on_write_complete)
return future
def test_handle_layer_error(self):
context = LayerContext(mode="socks",
src_stream=self.src_stream,
port=443,
scheme="h2")
layer_manager._handle_layer_error(gen.TimeoutError("timeout"), context)
context.src_stream.close.assert_called_once_with()
context.src_stream.reset_mock()
layer_manager._handle_layer_error(
DestNotConnectedError("stream closed"), context)
context.src_stream.close.assert_not_called()
context.src_stream.reset_mock()
layer_manager._handle_layer_error(
DestStreamClosedError("stream closed"), context)
context.src_stream.close.assert_called_once_with()
context.src_stream.reset_mock()
layer_manager._handle_layer_error(
SrcStreamClosedError("stream closed"), context)
context.src_stream.close.assert_not_called()
context.src_stream.reset_mock()
layer_manager._handle_layer_error(
iostream.StreamClosedError("stream closed"), context)
context.src_stream.close.assert_called_once_with()
def readFrame(self):
# IOStream processes reads one at a time
with (yield self._read_lock.acquire()):
with self.io_exception_context():
frame_header = yield self.stream.read_bytes(4)
if len(frame_header) == 0:
raise iostream.StreamClosedError('Read zero bytes from stream')
frame_length, = struct.unpack('!i', frame_header)
frame = yield self.stream.read_bytes(frame_length)
raise gen.Return(frame)
def write_headers(self, start_line, headers, chunk=None, callback=None):
lines = []
if self.is_client:
self._request_start_line = start_line
lines.append(
utf8('%s %s HTTP/1.1' % (start_line[0], start_line[1])))
self._chunking_output = (start_line.method
in ('POST', 'PUT', 'PATCH')
and 'Content-Length' not in headers
and 'Transfer-Encoding' not in headers)
else:
self._response_start_line = start_line
lines.append(
utf8('HTTP/1.1 %s %s' % (start_line[1], start_line[2])))
self._chunking_output = (self._request_start_line.version
== 'HTTP/1.1' and start_line.code != 304
and 'Content-Length' not in headers
and 'Transfer-Encoding' not in headers)
if (self._request_start_line.version == 'HTTP/1.0'
and (self._request_headers.get('Connection', '').lower()
== 'keep-alive')):
headers['Connection'] = 'Keep-Alive'
if self._chunking_output:
headers['Transfer-Encoding'] = 'chunked'
if (not self.is_client and (self._request_start_line.method == 'HEAD'
or start_line.code == 304)):
self._expected_content_remaining = 0
elif 'Content-Length' in headers:
self._expected_content_remaining = int(headers['Content-Length'])
else:
self._expected_content_remaining = None
lines.extend([utf8(n) + b": " + utf8(v) for n, v in headers.get_all()])
for line in lines:
if b'\n' in line:
raise ValueError('Newline in header: ' + repr(line))
future = None
if self.stream.closed():
future = self._write_future = Future()
future.set_exception(iostream.StreamClosedError())
future.exception()
else:
if callback is not None:
self._write_callback = stack_context.wrap(callback)
else:
future = self._write_future = Future()
data = b"\r\n".join(lines) + b"\r\n\r\n"
if chunk:
data += self._format_chunk(chunk)
self._pending_write = self.stream.write(data)
self._pending_write.add_done_callback(self._on_write_complete)
return future
def read_frame(self):
# IOStream processes reads one at a time
with (yield self._read_lock.acquire()):
with self.io_exception_context():
frame_header = yield self._read_bytes(4)
if len(frame_header) == 0:
raise iostream.StreamClosedError(
'Read zero bytes from stream')
frame_length, = struct.unpack('!i', frame_header)
logging.debug('received frame header, frame length = %d',
frame_length)
frame = yield self._read_bytes(frame_length)
logging.debug('received frame payload: %r', frame)
raise gen.Return(frame)
def write(self, chunk, callback=None):
future = None
if self.stream.closed():
future = self._write_future = Future()
self._write_future.set_exception(iostream.StreamClosedError())
self._write_future.exception()
else:
if callback is not None:
self._write_callback = stack_context.wrap(callback)
else:
future = self._write_future = Future()
self._pending_write = self.stream.write(self._format_chunk(chunk))
self._pending_write.add_done_callback(self._on_write_complete)
return future
def write(self, chunk: bytes) -> "Future[None]":
"""Implements `.HTTPConnection.write`.
For backwards compatibility it is allowed but deprecated to
skip `write_headers` and instead call `write()` with a
pre-encoded header block.
"""
future = None
if self.stream.closed():
future = self._write_future = Future()
self._write_future.set_exception(iostream.StreamClosedError())
self._write_future.exception()
else:
future = self._write_future = Future()
self._pending_write = self.stream.write(self._format_chunk(chunk))
future_add_done_callback(self._pending_write, self._on_write_complete)
return future
def test_start_exceptions_in_all_connections(self):
self.add_broker(
"kafka01", 9092,
connect_error=Exception("oh no!")
)
self.add_broker(
"kafka02", 9000,
connect_error=iostream.StreamClosedError(),
)
self.add_broker(
"kafka03", 9092,
connect_error=exc.BrokerConnectionError("kafka03", 9092),
)
c = cluster.Cluster(["kafka01", "kafka02:9000", "kafka03"])
with self.assertRaises(exc.NoBrokersError):
yield c.start()
def write(self, chunk, callback=None):
"""Implements `.HTTPConnection.write`.
For backwards compatibility is is allowed but deprecated to
skip `write_headers` and instead call `write()` with a
pre-encoded header block.
"""
if self.stream.closed():
self._write_future = Future()
self._write_future.set_exception(iostream.StreamClosedError())
else:
if callback is not None:
self._write_callback = stack_context.wrap(callback)
else:
self._write_future = Future()
self.stream.write(self._format_chunk(chunk),
self._on_write_complete)
return self._write_future
def test_send_stream_closed(self):
self.set_responses(
broker_id=1, api="metadata",
responses=[
iostream.StreamClosedError(),
]
)
c = client.Client(["kafka01", "kafka02"])
request = Mock(api="metadata")
results = yield c.send({1: request})
self.assert_sent(1, request)
self.assertEqual(c.cluster.heal.called, False)
self.assertEqual(results, {})
def write(self, chunk, callback=None):
"""Implements `.HTTPConnection.write`.
For backwards compatibility it is allowed but deprecated to
skip `write_headers` and instead call `write()` with a
pre-encoded header block.
"""
future = None
if self.stream.closed():
future = self._write_future = Future()
self._write_future.set_exception(iostream.StreamClosedError())
self._write_future.exception()
else:
if callback is not None:
warnings.warn("callback argument is deprecated, use returned Future instead",
DeprecationWarning)
self._write_callback = stack_context.wrap(callback)
else:
future = self._write_future = Future()
self._pending_write = self.stream.write(self._format_chunk(chunk))
self._pending_write.add_done_callback(self._on_write_complete)
return future
def write_headers(
self,
start_line: Union[httputil.RequestStartLine,
httputil.ResponseStartLine],
headers: httputil.HTTPHeaders,
chunk: bytes = None,
) -> "Future[None]":
"""Implements `.HTTPConnection.write_headers`."""
lines = []
if self.is_client:
assert isinstance(start_line, httputil.RequestStartLine)
self._request_start_line = start_line
lines.append(
utf8("%s %s HTTP/1.1" % (start_line[0], start_line[1])))
# Client requests with a non-empty body must have either a
# Content-Length or a Transfer-Encoding.
self._chunking_output = (
start_line.method in ("POST", "PUT", "PATCH")
and "Content-Length" not in headers
and ("Transfer-Encoding" not in headers
or headers["Transfer-Encoding"] == "chunked"))
else:
assert isinstance(start_line, httputil.ResponseStartLine)
assert self._request_start_line is not None
assert self._request_headers is not None
self._response_start_line = start_line
lines.append(
utf8("HTTP/1.1 %d %s" % (start_line[1], start_line[2])))
self._chunking_output = (
# TODO: should this use
# self._request_start_line.version or
# start_line.version?
self._request_start_line.version == "HTTP/1.1"
# 1xx, 204 and 304 responses have no body (not even a zero-length
# body), and so should not have either Content-Length or
# Transfer-Encoding headers.
and start_line.code not in (204, 304) and
(start_line.code < 100 or start_line.code >= 200)
# No need to chunk the output if a Content-Length is specified.
and "Content-Length" not in headers
# Applications are discouraged from touching Transfer-Encoding,
# but if they do, leave it alone.
and "Transfer-Encoding" not in headers)
# If connection to a 1.1 client will be closed, inform client
if (self._request_start_line.version == "HTTP/1.1"
and self._disconnect_on_finish):
headers["Connection"] = "close"
# If a 1.0 client asked for keep-alive, add the header.
if (self._request_start_line.version == "HTTP/1.0"
and self._request_headers.get("Connection",
"").lower() == "keep-alive"):
headers["Connection"] = "Keep-Alive"
if self._chunking_output:
headers["Transfer-Encoding"] = "chunked"
if not self.is_client and (self._request_start_line.method == "HEAD"
or cast(httputil.ResponseStartLine,
start_line).code == 304):
self._expected_content_remaining = 0
elif "Content-Length" in headers:
self._expected_content_remaining = int(headers["Content-Length"])
else:
self._expected_content_remaining = None
# TODO: headers are supposed to be of type str, but we still have some
# cases that let bytes slip through. Remove these native_str calls when those
# are fixed.
header_lines = (native_str(n) + ": " + native_str(v)
for n, v in headers.get_all())
lines.extend(l.encode("latin1") for l in header_lines)
for line in lines:
if b"\n" in line:
raise ValueError("Newline in header: " + repr(line))
future = None
if self.stream.closed():
future = self._write_future = Future()
future.set_exception(iostream.StreamClosedError())
future.exception()
else:
future = self._write_future = Future()
data = b"\r\n".join(lines) + b"\r\n\r\n"
if chunk:
data += self._format_chunk(chunk)
self._pending_write = self.stream.write(data)
future_add_done_callback(self._pending_write,
self._on_write_complete)
return future
def write_headers(self, start_line, headers, chunk=None, callback=None):
"""Implements `.HTTPConnection.write_headers`."""
lines = []
if self.is_client:
self._request_start_line = start_line
lines.append(
utf8('%s %s HTTP/1.1' % (start_line[0], start_line[1])))
# Client requests with a non-empty body must have either a
# Content-Length or a Transfer-Encoding.
self._chunking_output = (start_line.method
in ('POST', 'PUT', 'PATCH')
and 'Content-Length' not in headers
and 'Transfer-Encoding' not in headers)
else:
self._response_start_line = start_line
lines.append(
utf8('HTTP/1.1 %d %s' % (start_line[1], start_line[2])))
self._chunking_output = (
# TODO: should this use
# self._request_start_line.version or
# start_line.version?
self._request_start_line.version == 'HTTP/1.1' and
# 1xx, 204 and 304 responses have no body (not even a zero-length
# body), and so should not have either Content-Length or
# Transfer-Encoding headers.
start_line.code not in (204, 304)
and (start_line.code < 100 or start_line.code >= 200) and
# No need to chunk the output if a Content-Length is specified.
'Content-Length' not in headers and
# Applications are discouraged from touching Transfer-Encoding,
# but if they do, leave it alone.
'Transfer-Encoding' not in headers)
# If connection to a 1.1 client will be closed, inform client
if (self._request_start_line.version == 'HTTP/1.1'
and self._disconnect_on_finish):
headers['Connection'] = 'close'
# If a 1.0 client asked for keep-alive, add the header.
if (self._request_start_line.version == 'HTTP/1.0'
and (self._request_headers.get('Connection', '').lower()
== 'keep-alive')):
headers['Connection'] = 'Keep-Alive'
if self._chunking_output:
headers['Transfer-Encoding'] = 'chunked'
if (not self.is_client and (self._request_start_line.method == 'HEAD'
or start_line.code == 304)):
self._expected_content_remaining = 0
elif 'Content-Length' in headers:
self._expected_content_remaining = int(headers['Content-Length'])
else:
self._expected_content_remaining = None
# TODO: headers are supposed to be of type str, but we still have some
# cases that let bytes slip through. Remove these native_str calls when those
# are fixed.
header_lines = (native_str(n) + ": " + native_str(v)
for n, v in headers.get_all())
if PY3:
lines.extend(l.encode('latin1') for l in header_lines)
else:
lines.extend(header_lines)
for line in lines:
if b'\n' in line:
raise ValueError('Newline in header: ' + repr(line))
future = None
if self.stream.closed():
future = self._write_future = Future()
future.set_exception(iostream.StreamClosedError())
future.exception()
else:
if callback is not None:
self._write_callback = stack_context.wrap(callback)
else:
future = self._write_future = Future()
data = b"\r\n".join(lines) + b"\r\n\r\n"
if chunk:
data += self._format_chunk(chunk)
self._pending_write = self.stream.write(data)
self._pending_write.add_done_callback(self._on_write_complete)
return future
def test_heal_with_initial_broker_errors(self):
initial = metadata.MetadataResponse(
brokers=[
metadata.Broker(broker_id=2, host="kafka01", port=9092),
metadata.Broker(broker_id=7, host="kafka02", port=9000),
metadata.Broker(broker_id=8, host="kafka03", port=9092),
],
topics=[
metadata.TopicMetadata(
error_code=errors.no_error,
name="test.topic",
partitions=[
metadata.PartitionMetadata(
error_code=errors.no_error,
partition_id=0,
leader=2,
replicas=[],
isrs=[],
),
]
),
],
)
fixed = metadata.MetadataResponse(
brokers=[
metadata.Broker(broker_id=2, host="kafka01", port=9092),
],
topics=[
metadata.TopicMetadata(
error_code=errors.no_error,
name="test.topic",
partitions=[
metadata.PartitionMetadata(
error_code=errors.no_error,
partition_id=0,
leader=2,
replicas=[],
isrs=[],
),
]
),
],
)
self.add_broker("kafka01", 9092, responses=[initial, fixed])
self.add_broker(
"kafka02", 9000,
connect_error=iostream.StreamClosedError(),
)
self.add_broker(
"kafka03", 9092,
connect_error=exc.BrokerConnectionError("kafka03", 9092),
)
conn1 = cluster.Connection("kafka01", 9092)
c = cluster.Cluster(["kafka01", "kafka02:900"])
c.conns = {2: conn1}
yield c.heal()
self.assertEqual([2], list(c.conns.keys()))
def on_connection_close(self):
if _has_stream_request_body(self.__class__):
if not self.request.body.done():
self.request.body.set_exception(iostream.StreamClosedError())
self.request.body.exception()
def write_headers(self, start_line, headers, chunk=None, callback=None):
"""Implements `.HTTPConnection.write_headers`."""
if self.is_client:
self._request_start_line = start_line
# Client requests with a non-empty body must have either a
# Content-Length or a Transfer-Encoding.
# 不检查是否 Http/1.0 是不完备的。
self._chunking_output = (
start_line.method in ('POST', 'PUT', 'PATCH') and
'Content-Length' not in headers and
'Transfer-Encoding' not in headers)
else:
self._response_start_line = start_line
# 对于 HTTP/1.0 ``self._chunking_output=False``，不支持分块传输编码。
self._chunking_output = (
# TODO: should this use
# self._request_start_line.version or
# start_line.version?
self._request_start_line.version == 'HTTP/1.1' and
# 304 responses have no body (not even a zero-length body), and so
# should not have either Content-Length or Transfer-Encoding.
# headers.
start_line.code != 304 and
# No need to chunk the output if a Content-Length is specified.
'Content-Length' not in headers and
# Applications are discouraged from touching Transfer-Encoding,
# but if they do, leave it alone.
'Transfer-Encoding' not in headers)
# If a 1.0 client asked for keep-alive, add the header.
# HTTP/1.1 默认就是持久化连接，不需要单独指定。
# 假设客户端请求使用 HTTP/1.0 和 `Connection:Keep-Alive`，服务端响应时没有指定
# `Content-Length` （比如在 handler 中多次调用 flush 方法）,那么响应数据就无法
# 判断边界，代码中应该对这个条件做特别处理。
if (self._request_start_line.version == 'HTTP/1.0' and
(self._request_headers.get('Connection', '').lower()
== 'keep-alive')):
headers['Connection'] = 'Keep-Alive'
if self._chunking_output:
headers['Transfer-Encoding'] = 'chunked'
# 服务端响应 `HEAD` 或者 304 时不需要 body 数据。
if (not self.is_client and
(self._request_start_line.method == 'HEAD' or
start_line.code == 304)):
self._expected_content_remaining = 0
elif 'Content-Length' in headers:
self._expected_content_remaining = int(headers['Content-Length'])
else:
self._expected_content_remaining = None
lines = [utf8("%s %s %s" % start_line)]
# 通过 add 添加的响应头会输出多个，比如：“Set-Cookie” 响应头。
lines.extend([utf8(n) + b": " + utf8(v) for n, v in headers.get_all()])
for line in lines:
if b'\n' in line:
raise ValueError('Newline in header: ' + repr(line))
future = None
if self.stream.closed():
future = self._write_future = Future()
future.set_exception(iostream.StreamClosedError())
else:
# "写回调" 是一个实例字段 `_write_callback`，当上一次写操作还没有回调时就再次执行
# 写操作，那么上一次写操作的回调将被放弃（callback is not None）
if callback is not None:
self._write_callback = stack_context.wrap(callback)
else:
# 没有 callback 时，返回 Future(self._write_future)
future = self._write_future = Future()
# Headers
data = b"\r\n".join(lines) + b"\r\n\r\n"
# message-body
if chunk:
data += self._format_chunk(chunk)
self._pending_write = self.stream.write(data)
self._pending_write.add_done_callback(self._on_write_complete)
return future
