async def open(self) -> None:
self._pre_open_closing_log(closing=False)
try:
fut = asyncio.open_connection(
host=self._base_transport_args.host, port=self._base_transport_args.port
)
self.stdout, self.stdin = await asyncio.wait_for(
fut, timeout=self._base_transport_args.timeout_socket
)
except ConnectionError as exc:
msg = f"Failed to open telnet session to host {self._base_transport_args.host}"
if "connection refused" in str(exc).lower():
msg = (
f"Failed to open telnet session to host {self._base_transport_args.host}, "
"connection refused"
)
raise ScrapliConnectionError(msg) from exc
except (OSError, socket.gaierror) as exc:
msg = (
f"Failed to open telnet session to host {self._base_transport_args.host} -- "
"do you have a bad host/port?"
)
raise ScrapliConnectionError(msg) from exc
except asyncio.TimeoutError as exc:
msg = "timed out opening connection to device"
self.logger.critical(msg)
raise ScrapliAuthenticationFailed(msg) from exc
await self._handle_control_chars()
self._post_open_closing_log(closing=False)
def read(self) -> bytes:
if not self.session:
raise ScrapliConnectionNotOpened
try:
buf = self.session.read_eager()
except Exception as exc:
raise ScrapliConnectionError(
"encountered EOF reading from transport; typically means the device closed the "
"connection") from exc
return buf
def read(self) -> bytes:
if not self.session_channel:
raise ScrapliConnectionNotOpened
try:
buf: bytes = self.session_channel.recv(65535)
except Exception as exc:
msg = (
"encountered EOF reading from transport; typically means the device closed the "
"connection")
self.logger.critical(msg)
raise ScrapliConnectionError(msg) from exc
return buf
async def open(self) -> None:
self._pre_open_closing_log(closing=False)
try:
self.stdout, self.stdin = await asyncio.open_connection(
host=self._base_transport_args.host,
port=self._base_transport_args.port)
except ConnectionError as exc:
msg = f"Failed to open telnet session to host {self._base_transport_args.host}"
if "connection refused" in str(exc).lower():
msg = (
f"Failed to open telnet session to host {self._base_transport_args.host}, "
"connection refused")
raise ScrapliConnectionError(msg) from exc
except (OSError, socket.gaierror) as exc:
msg = (
f"Failed to open telnet session to host {self._base_transport_args.host} -- "
"do you have a bad host/port?")
raise ScrapliConnectionError(msg) from exc
await self._handle_control_chars()
self._post_open_closing_log(closing=False)
async def read(self) -> bytes:
if not self.stdout:
raise ScrapliConnectionNotOpened
try:
buf: bytes = await self.stdout.read(65535)
except ConnectionLost as exc:
msg = (
"encountered EOF reading from transport; typically means the device closed the "
"connection"
)
self.logger.critical(msg)
raise ScrapliConnectionError(msg) from exc
return buf
def open(self) -> None:
self._pre_open_closing_log(closing=False)
# establish session with "socket" timeout, then reset timeout to "transport" timeout
try:
self.session = ScrapliTelnet(
host=self._base_transport_args.host,
port=self._base_transport_args.port,
timeout=self._base_transport_args.timeout_socket,
)
self.session.timeout = self._base_transport_args.timeout_transport
except ConnectionError as exc:
msg = f"Failed to open telnet session to host {self._base_transport_args.host}"
if "connection refused" in str(exc).lower():
msg = (
f"Failed to open telnet session to host {self._base_transport_args.host}, "
"connection refused")
raise ScrapliConnectionError(msg) from exc
self._post_open_closing_log(closing=False)
async def read(self) -> bytes:
if not self.stdout:
raise ScrapliConnectionNotOpened
if self._initial_buf:
buf = self._initial_buf
self._initial_buf = b""
return buf
try:
buf = await self.stdout.read(65535)
# nxos at least sends "binary transmission" control char, but seems to not (afaik?)
# actually advertise it during the control protocol exchange, causing us to not be able
# to "know" that it is in binary transmit mode until later... so we will just always
# strip this option (b"\x00") out of the buffered data...
buf = buf.replace(b"\x00", b"")
except EOFError as exc:
raise ScrapliConnectionError(
"encountered EOF reading from transport; typically means the device closed the "
"connection") from exc
return buf
