def read_from_socket(self, timeout=SENTINEL, raise_on_timeout=True):
sock = self._sock
custom_timeout = timeout is not SENTINEL
try:
if custom_timeout:
sock.settimeout(timeout)
if HIREDIS_USE_BYTE_BUFFER:
bufflen = recv_into(self._sock, self._buffer)
if bufflen == 0:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
self._reader.feed(self._buffer, 0, bufflen)
else:
buffer = recv(self._sock, self.socket_read_size)
# an empty string indicates the server shutdown the socket
if not isinstance(buffer, bytes) or len(buffer) == 0:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
self._reader.feed(buffer)
# data was read from the socket and added to the buffer.
# return True to indicate that data was read.
return True
except blocking_exceptions as ex:
# if we're in nonblocking mode and the recv raises a
# blocking error, simply return False indicating that
# there's no data to be read. otherwise raise the
# original exception.
if raise_on_timeout:
raise
return False
except socket.timeout:
if not raise_on_timeout:
raise
return False
finally:
if custom_timeout:
sock.settimeout(self._socket_timeout)
def _read_from_socket(self, length=None):
socket_read_size = self.socket_read_size
buf = self._buffer
buf.seek(self.bytes_written)
marker = 0
try:
while True:
data = recv(self._sock, socket_read_size)
# an empty string indicates the server shutdown the socket
if isinstance(data, bytes) and len(data) == 0:
raise socket.error(SERVER_CLOSED_CONNECTION_ERROR)
buf.write(data)
data_length = len(data)
self.bytes_written += data_length
marker += data_length
if length is not None and length > marker:
continue
break
except socket.timeout:
raise TimeoutError("Timeout reading from socket")
except socket.error:
e = sys.exc_info()[1]
raise ConnectionError("Error while reading from socket: %s" %
(e.args,))
def _read_from_socket(self, length=None):
socket_read_size = self.socket_read_size
buf = self._buffer
buf.seek(self.bytes_written) # TODO 指针跳到buffer中已写bytes的末尾
marker = 0 # TODO 用来记录已经从socket中接收到的报文的总长度
try:
# TODO 如果length为None，则while循环仅仅只执行了1次
while True:
data = recv(self._sock,
socket_read_size) # TODO 从socket中读取指定长度的数据报文
# an empty string indicates the server shutdown the socket
if isinstance(data, bytes) and len(data) == 0:
raise socket.error(SERVER_CLOSED_CONNECTION_ERROR)
buf.write(data) # TODO 将读取到的response数据写到self._buffer
data_length = len(data)
self.bytes_written += data_length
marker += data_length
if length is not None and length > marker: # TODO 当接收的报文长度小于length时，才继续接收
continue
break
except socket.timeout:
raise TimeoutError("Timeout reading from socket")
except socket.error:
e = sys.exc_info()[1]
raise ConnectionError("Error while reading from socket: %s" %
(e.args, ))
def read_response(self):
if not self._reader:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
# _next_response might be cached from a can_read() call
if self._next_response is not False:
response = self._next_response
self._next_response = False
return response
response = self._reader.gets()
socket_read_size = self.socket_read_size
while response is False:
try:
if HIREDIS_USE_BYTE_BUFFER:
bufflen = recv_into(self._sock, self._buffer)
if bufflen == 0:
raise socket.error(SERVER_CLOSED_CONNECTION_ERROR)
else:
buffer = recv(self._sock, socket_read_size)
# an empty string indicates the server shutdown the socket
if not isinstance(buffer, bytes) or len(buffer) == 0:
raise socket.error(SERVER_CLOSED_CONNECTION_ERROR)
except socket.timeout:
raise TimeoutError("Timeout reading from socket")
except socket.error:
e = sys.exc_info()[1]
raise ConnectionError("Error while reading from socket: %s" %
(e.args,))
if HIREDIS_USE_BYTE_BUFFER:
self._reader.feed(self._buffer, 0, bufflen)
else:
self._reader.feed(buffer)
response = self._reader.gets()
# if an older version of hiredis is installed, we need to attempt
# to convert ResponseErrors to their appropriate types.
if not HIREDIS_SUPPORTS_CALLABLE_ERRORS:
if isinstance(response, ResponseError):
response = self.parse_error(response.args[0])
elif isinstance(response, list) and response and \
isinstance(response[0], ResponseError):
response[0] = self.parse_error(response[0].args[0])
# if the response is a ConnectionError or the response is a list and
# the first item is a ConnectionError, raise it as something bad
# happened
if isinstance(response, ConnectionError):
raise response
elif isinstance(response, list) and response and \
isinstance(response[0], ConnectionError):
raise response[0]
return response
def _read_from_socket(self,
length=None,
timeout=SENTINEL,
raise_on_timeout=True):
sock = self._sock
socket_read_size = self.socket_read_size
buf = self._buffer
buf.seek(self.bytes_written)
marker = 0
custom_timeout = timeout is not SENTINEL
try:
if custom_timeout:
sock.settimeout(timeout)
while True:
data = recv(self._sock, socket_read_size)
# an empty string indicates the server shutdown the socket
if isinstance(data, bytes) and len(data) == 0:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
buf.write(data)
data_length = len(data)
self.bytes_written += data_length
marker += data_length
if length is not None and length > marker:
continue
return True
except socket.timeout:
if raise_on_timeout:
raise TimeoutError("Timeout reading from socket")
return False
except NONBLOCKING_EXCEPTIONS as ex:
# if we're in nonblocking mode and the recv raises a
# blocking error, simply return False indicating that
# there's no data to be read. otherwise raise the
# original exception.
allowed = NONBLOCKING_EXCEPTION_ERROR_NUMBERS.get(ex.__class__, -1)
if not raise_on_timeout and ex.errno == allowed:
return False
raise ConnectionError("Error while reading from socket: %s" %
(ex.args, ))
finally:
if custom_timeout:
sock.settimeout(self.socket_timeout)
def _read_from_socket(self, length=None):
socket_read_size = self.socket_read_size
buf = self._buffer
buf.seek(self.bytes_written)
marker = 0
while True:
data = recv(self._sock, socket_read_size)
# an empty string indicates the server shutdown the socket
if isinstance(data, bytes) and len(data) == 0:
raise socket.error(SERVER_CLOSED_CONNECTION_ERROR)
buf.write(data)
data_length = len(data)
self.bytes_written += data_length
marker += data_length
if length is not None and length > marker:
continue
break
def _read_from_socket(self, length=None):
socket_read_size = self.socket_read_size
buf = self._buffer
buf.seek(self.bytes_written)
marker = 0
while True:
data = recv(self._sock, socket_read_size)
# an empty string indicates the server shutdown the socket
if isinstance(data, bytes) and len(data) == 0:
raise socket.error(SERVER_CLOSED_CONNECTION_ERROR)
buf.write(data)
data_length = len(data)
self.bytes_written += data_length
marker += data_length
if length is not None and length > marker:
continue
break
def _read_from_socket(self,
length=None,
timeout=SENTINEL,
raise_on_timeout=True):
sock = self._sock
socket_read_size = self.socket_read_size
buf = self._buffer
buf.seek(self.bytes_written)
marker = 0
custom_timeout = timeout is not SENTINEL
try:
if custom_timeout:
sock.settimeout(timeout)
while True:
data = recv(self._sock, socket_read_size)
# an empty string indicates the server shutdown the socket
if isinstance(data, bytes) and len(data) == 0:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
buf.write(data)
data_length = len(data)
self.bytes_written += data_length
marker += data_length
if length is not None and length > marker:
continue
return True
except BlockingIOError as ex:
# if we're in nonblocking mode and the recv raises a
# blocking error, simply return False indicating that
# there's no data to be read. otherwise raise the
# original exception.
if raise_on_timeout or ex.errno != EWOULDBLOCK:
raise
return False
except socket.timeout:
if raise_on_timeout:
raise
return False
finally:
if custom_timeout:
sock.settimeout(self.socket_timeout)
def read_from_socket(self, timeout=SENTINEL, raise_on_timeout=True):
sock = self._sock
custom_timeout = timeout is not SENTINEL
try:
if custom_timeout:
sock.settimeout(timeout)
if HIREDIS_USE_BYTE_BUFFER:
bufflen = recv_into(self._sock, self._buffer)
if bufflen == 0:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
self._reader.feed(self._buffer, 0, bufflen)
else:
buffer = recv(self._sock, self.socket_read_size)
# an empty string indicates the server shutdown the socket
if not isinstance(buffer, bytes) or len(buffer) == 0:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
self._reader.feed(buffer)
# data was read from the socket and added to the buffer.
# return True to indicate that data was read.
return True
except socket.timeout:
if raise_on_timeout:
raise TimeoutError("Timeout reading from socket")
return False
except NONBLOCKING_EXCEPTIONS as ex:
# if we're in nonblocking mode and the recv raises a
# blocking error, simply return False indicating that
# there's no data to be read. otherwise raise the
# original exception.
allowed = NONBLOCKING_EXCEPTION_ERROR_NUMBERS.get(ex.__class__, -1)
if not raise_on_timeout and ex.errno == allowed:
return False
raise ConnectionError("Error while reading from socket: %s" %
(ex.args, ))
finally:
if custom_timeout:
sock.settimeout(self._socket_timeout)
