def _check_communication(self) -> bool:
""" Send a "sendme" command and synchronously wait for a response. NOT to be used when an event loop is running.
"""
command = SendmeCommand()
communication_ok = False
while True:
# Depending on Nextion status we may have some stale data lingering
# because we have sent stuff with wrong baudrate and Nextion is answering
# with an "Invalid Variable" event or something like that.
# So we keep sending "sendme" until we get a proper response.
command.send(self.transport)
timeout = Timeout(0.2) # 200ms should be WAY MORE than enough
while not timeout.expired():
data = self.transport.read_next()
if data:
try:
data_event = MsgEvent.parse(data)
except NexMessageException:
pass
else:
communication_ok = isinstance(data_event,
CurrentPageIDHeadEvent)
break
if timeout.expired() or communication_ok:
break
return communication_ok
def read_until(port, terminators=None, size=None):
"""\
Read until any of the termination sequences is found ('\n' by default), the size
is exceeded or until timeout occurs.
"""
if not terminators:
terminators = ['\n']
terms = map(lambda t: (t, len(t)), terminators)
line = bytearray()
timeout = Timeout(port._timeout)
while True:
c = port.read(1)
if c:
line += c
for (terminator, lenterm) in terms:
if line[-lenterm:] == terminator:
# break does not work here because it will only step out of for
return bytes(line)
if size is not None and len(line) >= size:
break
else:
break
if timeout.expired():
break
return bytes(line)
def read(self, size=1):
"""\
Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read.
"""
if not self.is_open:
raise PortNotOpenError()
read = bytearray()
timeout = Timeout(self._timeout)
poll = select.poll()
poll.register(self.fd, select.POLLIN | select.POLLERR | select.POLLHUP | select.POLLNVAL)
poll.register(self.pipe_abort_read_r, select.POLLIN | select.POLLERR | select.POLLHUP | select.POLLNVAL)
if size > 0:
while len(read) < size:
# print "\tread(): size",size, "have", len(read) #debug
# wait until device becomes ready to read (or something fails)
for fd, event in poll.poll(None if timeout.is_infinite else (timeout.time_left() * 1000)):
if fd == self.pipe_abort_read_r:
break
if event & (select.POLLERR | select.POLLHUP | select.POLLNVAL):
raise SerialException('device reports error (poll)')
# we don't care if it is select.POLLIN or timeout, that's
# handled below
if fd == self.pipe_abort_read_r:
os.read(self.pipe_abort_read_r, 1000)
break
buf = os.read(self.fd, size - len(read))
read.extend(buf)
if timeout.expired() \
or (self._inter_byte_timeout is not None and self._inter_byte_timeout > 0) and not buf:
break # early abort on timeout
return bytes(read)
def init(self):
""" Set the device to always send responses and select page 0. To be called in single-threaded environment
WITHOUT any poller running
"""
self._logger.info("Initializing Nextion device")
# Flush incoming data
while True:
if not self.transport.read_all():
break
# First check if the transport has the correct baudrate
if not self._check_communication():
raise NexCommandFailure(
"Could not initialize Nextion device communication with current transport settings"
)
if self._force_baudrate and self._force_baudrate != self.transport.baudrate:
command = BaudCommand(self._force_baudrate)
command.send(self.transport)
self._logger.info("Changing baudrate to {}", self._force_baudrate)
self.transport.baudrate = self._force_baudrate
timeout = Timeout(0.1) # 100ms should be WAY MORE than enough
while not timeout.expired():
# We may have a Command Succeeded if we are in bkcmd=3 mode
self.transport.read_all()
if not self._check_communication():
raise NexCommandFailure(
"Could not change device baudrate to {}".format(
self._force_baudrate))
self._logger.info("Changed baudrate to %d", self._force_baudrate)
# mode = Return.Mode.NO_RETURN
# mode = Return.Mode.SUCCESS_ONLY # production setting
# mode = Return.Mode.FAIL_ONLY # default screen setting
mode = Return.Mode.ALWAYS
self._commands.extendleft((
Command("bkcmd=%d" % mode.value
), # This must come first as is the first to be executed
))
while self._commands:
self.poll()
for page_id, page in self._pages_by_id.items():
self.select_page(page_id)
while self._commands:
self.poll()
page.onetime_refresh()
while self._commands:
self.poll()
self.select_page(0)
while self._commands:
self.poll()
self._initialized = True
self._logger.info("Nextion device initialized")
def read(self, size=1):
"""\
Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read.
"""
if not self.is_open:
raise PortNotOpenError()
read = bytearray()
timeout = Timeout(self._timeout)
while len(read) < size:
try:
ready, _, _ = select.select([self.fd, self.pipe_abort_read_r],
[], [], timeout.time_left())
if self.pipe_abort_read_r in ready:
os.read(self.pipe_abort_read_r, 1000)
break
# If select was used with a timeout, and the timeout occurs, it
# returns with empty lists -> thus abort read operation.
# For timeout == 0 (non-blocking operation) also abort when
# there is nothing to read.
if not ready:
break # timeout
buf = os.read(self.fd, size - len(read))
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('read failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('read failed: {}'.format(e))
else:
# read should always return some data as select reported it was
# ready to read when we get to this point.
if not buf:
# Disconnected devices, at least on Linux, show the
# behavior that they are always ready to read immediately
# but reading returns nothing.
raise SerialException(
'device reports readiness to read but returned no data '
'(device disconnected or multiple access on port?)')
read.extend(buf)
if timeout.expired():
break
return bytes(read)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = length = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], timeout.time_left())
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('write failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('write failed: {}'.format(e))
if not timeout.is_non_blocking and timeout.expired():
raise writeTimeoutError
return length - len(d)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = length = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], timeout.time_left())
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('write failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('write failed: {}'.format(e))
if not timeout.is_non_blocking and timeout.expired():
raise writeTimeoutError
return length - len(d)
def read(self, size=1):
"""\
Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read.
"""
if not self.is_open:
raise portNotOpenError
read = bytearray()
timeout = Timeout(self._timeout)
while len(read) < size:
try:
ready, _, _ = select.select([self.fd, self.pipe_abort_read_r], [], [], timeout.time_left())
if self.pipe_abort_read_r in ready:
os.read(self.pipe_abort_read_r, 1000)
break
# If select was used with a timeout, and the timeout occurs, it
# returns with empty lists -> thus abort read operation.
# For timeout == 0 (non-blocking operation) also abort when
# there is nothing to read.
if not ready:
break # timeout
buf = os.read(self.fd, size - len(read))
# read should always return some data as select reported it was
# ready to read when we get to this point.
if not buf:
# Disconnected devices, at least on Linux, show the
# behavior that they are always ready to read immediately
# but reading returns nothing.
raise SerialException(
'device reports readiness to read but returned no data '
'(device disconnected or multiple access on port?)')
read.extend(buf)
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('read failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('read failed: {}'.format(e))
if timeout.expired():
break
return bytes(read)
def _wait_for_response(self, command, timeout=None):
timeout = Timeout(timeout or self._timeout)
def read(size=1):
self._serial.timeout = timeout.time_left()
data = self._serial.read(size)
if len(data) != size:
raise TimeoutError()
return data
while True:
data = []
data += read(1)
if data[-1] != 0x55:
LOGGER.error(
'Got unexpected octet while waiting for response header: %02x',
data[-1])
continue
data += read(1)
if data[-1] != 0x55:
LOGGER.error(
'Got unexpected octet while waiting for response header: %02x',
data[-1])
continue
data += read(2)
length = data[2]
cmd = data[3]
data += read(length - 2) if length > 2 else []
params = data[4:]
LOGGER.debug('Got command %s response: %s', cmd, hex_data(data))
self._responses.append([cmd] + params)
return params
def send_message(self, data, timeout=DEFAULT_SEND_TIMEOUT):
self.urc_state = Modem.SOCKET_INIT
self.write_socket(data)
loop_timeout = Timeout(timeout)
while self.urc_state != Modem.SOCKET_SEND_READ:
self.checkURC()
if self.urc_state != Modem.SOCKET_SEND_READ:
if loop_timeout.expired():
raise SerialError('Timeout occurred waiting for message status')
time.sleep(self._RETRY_DELAY)
elif self.urc_state == Modem.SOCKET_CLOSED:
return '[1,0]' #this is connection closed for hologram cloud response
return self.read_socket()
def read(self, size=1):
"""\
Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read.
"""
if not self.is_open:
raise PortNotOpenError()
read = bytearray()
timeout = Timeout(self._timeout)
while len(read) < size:
try:
ready, _, _ = select.select([self._socket], [], [],
timeout.time_left())
# If select was used with a timeout, and the timeout occurs, it
# returns with empty lists -> thus abort read operation.
# For timeout == 0 (non-blocking operation) also abort when
# there is nothing to read.
if not ready:
break # timeout
buf = self._socket.recv(size - len(read))
# read should always return some data as select reported it was
# ready to read when we get to this point, unless it is EOF
if not buf:
raise SerialException('socket disconnected')
read.extend(buf)
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('read failed: {}'.format(e))
except (select.error, socket.error) as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('read failed: {}'.format(e))
if timeout.expired():
break
return bytes(read)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], timeout.time_left())
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: {}'.format(v))
# still calculate and check timeout
if timeout.expired():
raise writeTimeoutError
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], timeout.time_left())
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: {}'.format(v))
# still calculate and check timeout
if timeout.expired():
raise writeTimeoutError
return len(data)
def read(self, size=1):
if not self.is_open:
raise portNotOpenError
data = bytearray()
try:
timeout = Timeout(self._timeout)
while len(data) < size:
if self._thread is None:
raise SerialException(
'connection failed (reader thread died)')
buf = self._read_buffer.get(True, timeout.time_left())
if buf is None:
return bytes(data)
data += buf
if timeout.expired():
break
except Queue.Empty: # -> timeout
pass
return bytes(data)
def read(self, size=1):
"""\
Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read.
"""
if not self.is_open:
raise portNotOpenError
read = bytearray()
timeout = Timeout(self._timeout)
while len(read) < size:
try:
ready, _, _ = select.select([self._socket], [], [], timeout.time_left())
# If select was used with a timeout, and the timeout occurs, it
# returns with empty lists -> thus abort read operation.
# For timeout == 0 (non-blocking operation) also abort when
# there is nothing to read.
if not ready:
break # timeout
buf = self._socket.recv(size - len(read))
# read should always return some data as select reported it was
# ready to read when we get to this point, unless it is EOF
if not buf:
raise SerialException('socket disconnected')
read.extend(buf)
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('read failed: {}'.format(e))
except (select.error, socket.error) as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('read failed: {}'.format(e))
if timeout.expired():
break
return bytes(read)
def read(self, size=1):
'''Read data from the serial port.
Parameters:
size (int): the number of data bytes to read.
Returns:
read (bytes): data bytes read from the serial port.
'''
read = bytearray()
timeout = Timeout(self.timeout)
# If there is enough data in the buffer, do not bother to read.
if len(self._read_buffer) < size:
# Keep reading until there is enough data or timeout.
while self.in_waiting < size:
if timeout.expired():
break
# Get data from read buffer.
read = self._read_buffer[:size]
self._read_buffer = self._read_buffer[size:]
return bytes(read)
def _wait_for_response(self, servo_id, command, timeout=None):
timeout = Timeout(timeout or self._timeout)
def read(size=1):
self._serial.timeout = timeout.time_left()
data = self._serial.read(size)
if len(data) != size:
raise TimeoutError()
return data
while True:
data = []
data += read(1)
if data[-1] != 0x55:
continue
data += read(1)
if data[-1] != 0x55:
continue
data += read(3)
sid = data[2]
length = data[3]
cmd = data[4]
if length > 7:
print('Invalid length for packet %s', list(data), flush=True)
continue
data += read(length - 3) if length > 3 else []
params = data[5:]
data += read(1)
checksum = data[-1]
if 255 - (sid + length + cmd + sum(params)) % 256 != checksum:
print('Invalid checksum for packet %s', list(data), flush=True)
continue
if cmd != command:
print('Got unexpected command %s response %s',
cmd,
list(data),
flush=True)
continue
if servo_id != SERVO_ID_ALL and sid != servo_id:
print('Got command response from unexpected servo %s',
sid,
flush=True)
continue
break
return [sid, cmd, *params]
def _wait_for_response(self, servo_id, command, timeout=None):
timeout = Timeout(timeout or self._timeout)
# As Tx and Rx are tied together, clear the receive buffer to get rid of our last outbound packet.
self._serial.flushInput()
def read(size=1):
self._serial.timeout = timeout.time_left()
data = self._serial.read(size)
if len(data) != size:
raise TimeoutError()
return data
while True:
data = []
data += read(1)
if data[-1] != 0x55:
continue
data += read(1)
if data[-1] != 0x55:
continue
data += read(3)
sid = data[2]
length = data[3]
cmd = data[4]
if length > 7:
LOGGER.error('Invalid length for packet %s', list(data))
continue
data += read(length-3) if length > 3 else []
params = data[5:]
data += read(1)
checksum = data[-1]
if 255-(sid + length + cmd + sum(params)) % 256 != checksum:
LOGGER.error('Invalid checksum for packet %s', list(data))
continue
if cmd != command:
LOGGER.warning('Got unexpected command %s response %s',
cmd, list(data))
continue
if servo_id != SERVO_ID_ALL and sid != servo_id:
LOGGER.warning('Got command response from unexpected servo %s', sid)
continue
return [sid, cmd, *params]
def read(self, size=1):
"""\
Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read.
"""
if not self.is_open:
raise portNotOpenError
read = bytearray()
timeout = Timeout(self._timeout)
while len(read) < size:
try:
ready, _, _ = select.select([self.fd, self.pipe_abort_read_r],
[], [], timeout.time_left())
if self.pipe_abort_read_r in ready:
os.read(self.pipe_abort_read_r, 1000)
break
# If select was used with a timeout, and the timeout occurs, it
# returns with empty lists -> thus abort read operation.
# For timeout == 0 (non-blocking operation) also abort when
# there is nothing to read.
if not ready:
break # timeout
buf = os.read(self.fd, size - len(read))
# read should always return some data as select reported it was
# ready to read when we get to this point.
if not buf:
# Disconnected devices, at least on Linux, show the
# behavior that they are always ready to read immediately
# but reading returns nothing.
raise SerialException(
'device reports readiness to read but returned no data '
'(device disconnected or multiple access on port?)')
read.extend(buf)
except OSError as e:
# Devices connecting through a poor USB/Serial cable or an
# underpowered USB hub can spontaneously disconnect from
# the OS, and promptly reconnect. If this happens, attempt
# to reopen the device and continue the session.
if e.errno == errno.ENXIO:
retryTimeout = Timeout(2) # Allow for a short grace period
sys.stderr.write(
'pySerial WARNING: Serial device disappeared! '
'...Trying to reconnect...\n')
sys.stderr.write(
'pySerial WARNING: If this problem is chronic '
'replace your cable/powered USB HUB.\n')
sys.stderr.flush()
self.close()
while self.fd == None:
try:
self.open()
except OSError as e:
if e.errno != errno.ENOENT or retryTimeout.expired(
):
raise SerialException(
'Serial device gone: {}'.format(e))
break
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
elif e.errno not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('read failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('read failed: {}'.format(e))
if timeout.expired():
break
return bytes(read)
def GetBufferTillPattern(self, ExpectedPrompt=None, timeOutSeconds=10.0, send_new_line_on_timeout=True):
"""
this method tries to capture buffer till the termination sequence (prompt) is captured
or until the timeout has passed, return True if succeeded to capture prompt and False if timeout has passed
it also flushes its also flushes it self history buffer and fills it with all info for this session
:param ExpectedPrompt:
:type ExpectedPrompt: String Or Regex
:param timeOutSeconds:
:type timeOutSeconds: float
:return: bool
:rtype: bool
"""
if ExpectedPrompt is None:
ExpectedPrompt = self.shellPrompt
result = False
try:
getbufferTimeout = self.get_buffer_till_pattern_interval
self.lastBufferTillPrompt = ""
# type: (re, float) -> bool ,
# handle case where expected prompt is str
res_ExpectedPrompt = None
if isinstance(ExpectedPrompt, str):
# if PY3:
# res_ExpectedPrompt = re.compile(str(ExpectedPrompt).encode('utf-8'), re.IGNORECASE)
# else:
res_ExpectedPrompt = re.compile(str(ExpectedPrompt), re.IGNORECASE)
elif type(ExpectedPrompt) == self.reType:
res_ExpectedPrompt = ExpectedPrompt
# self.SetShellPrompt("Console#")
# buff = CommunicationManagement.GetBufferTillPrompt(self.connAlias)
timeout = Timeout(timeOutSeconds)
while not result:
buff = self.GetBuffer(getbufferTimeout)
if buff is not None and buff != "":
self.lastBufferTillPrompt += buff
if not self.cli_print_mode:
self.LogToTestLogger(buff)
if re.search(res_ExpectedPrompt, buff):
result = True
if self.cli_print_mode:
self.LogToTestLogger(self.lastBufferTillPrompt)
break
if timeout.expired():
if send_new_line_on_timeout:
# send newline char and try 1 final time, if still didn't succeed then give up
msg = "timeout expired\nsending newline char and trying 1 last time"
self.LogToTestLogger(msg,force_format=True)
self.SendCommand(self.newlineChar, AppendNewLine=False)
buff = self.GetBuffer(getbufferTimeout)
if buff is not None and buff != "":
if not self.cli_print_mode:
self.LogToTestLogger(buff)
self.lastBufferTillPrompt += buff
if re.search(res_ExpectedPrompt, self.lastBufferTillPrompt):
result = True
if self.cli_print_mode:
self.LogToTestLogger(self.lastBufferTillPrompt)
break
# TODO:handle event of user prompt - implement login() function
# got emtpy string
# if not buff:
# self.SendCommand(self.newlineChar)
except ConnectionLostException as e:
if self._handle_connection_lost(not self._is_inner_call, e, cmd_str=ExpectedPrompt):
# If the user handled the event we want to run the cmd again
return self.GetBufferTillPattern(ExpectedPrompt, timeOutSeconds, send_new_line_on_timeout)
except Exception as e:
self.LogToTestLogger(str(e),force_format=True)
# print str(e)
finally:
return result
def GetAllMatchedPatternsInBuffer(self, patterns_list, timeOutSeconds=10.0, sendNewlineBetweenAttempts=False):
"""
this method tries to capture buffer till any of the termination sequences(prompts) provided in patterns_list
or until the timeout has passed, return True if succeeded to capture prompt and False if timeout has passed
it also flushes its self history buffer and fills it with all info for this session
:param patterns_list: list of patterns to search in the buffer
:type patterns_list: list[str]
:param timeOutSeconds: timeout for search
:type timeOutSeconds: float
:param sendNewlineBetweenAttempts: indicate if to send newline between attempts to capture expected pattern
:type sendNewlineBetweenAttempts: bool
:return: pattern list of found patterns or None if no pattern was found before timeout
:rtype: list[str]
"""
if type(patterns_list) is not list:
raise TypeError("GetAllMatchedPatternsInBuffer: the type of patterns_list is not list but "
"type {}".format(str(type(patterns_list))))
# inner function to search multiple patterns
def search_all(listofpatterns, buffer):
retlist = []
if buffer:
for pattern in listofpatterns:
if re.search(pattern,buffer):
retlist.append(pattern)
return retlist
result = None
found_prompts = None
try:
getbufferTimeout = 0.1
self.lastBufferTillPrompt = ""
timeout = Timeout(timeOutSeconds)
while not result:
if sendNewlineBetweenAttempts:
self.SendCommand(self.newlineChar, AppendNewLine=False)
buff = self.GetBuffer(getbufferTimeout)
if buff is not None and buff != "":
if not self.cli_print_mode:
self.LogToTestLogger(buff)
self.lastBufferTillPrompt += buff
found_prompts = search_all(patterns_list, buff)
if found_prompts:
if self.cli_print_mode:
self.LogToTestLogger(self.lastBufferTillPrompt)
result = True
break
if timeout.expired():
# send newline char and try 1 final time, if still didn't succeed then give up
msg = "timeout expired\nsending newline char and trying 1 last time"
self.LogToTestLogger(msg,force_format=True)
self.SendCommand(self.newlineChar,AppendNewLine=False)
buff = self.GetBuffer(getbufferTimeout)
if buff is not None and buff != "":
if not self.cli_print_mode:
self.LogToTestLogger(buff)
self.lastBufferTillPrompt += buff
found_prompts = search_all(patterns_list , buff)
if not not found_prompts:
if self.cli_print_mode:
self.LogToTestLogger(self.lastBufferTillPrompt)
result = True
break
# got emtpy string
# if not buff:
# self.SendCommand(self.newlineChar)
except Exception as e:
self.LogToTestLogger(str(e),force_format=True)
# print str(e)
finally:
return found_prompts