def test_detect_bogus_scheme(handler):
"""When our handlers are installed, will still detect unknown scheme."""
with pytest.raises(ValueError) as excinfo:
# The scheme (the part before the ://) must be a Python module name, so use
# a string that can't be a module name.
rs232.SerialData(port='# bogus #://')
assert '# bogus #' in repr(excinfo.value)
def __init__(self, *args, **kwargs):
"""Initialize an AbstractSerialDome.
Creates a serial connection to the port indicated in the config.
"""
super().__init__(*args, **kwargs)
# Get config info, e.g. which port (e.g. /dev/ttyUSB123) should we use?
# TODO(jamessynge): Switch to passing configuration of serial port in as a sub-section
# of the dome config in the YAML. That way we don't intermingle serial settings and
# any other settings required.
cfg = self._dome_config
self._port = cfg.get('port')
if not self._port:
msg = 'No port specified in the config for dome: {}'.format(cfg)
self.logger.error(msg)
raise error.DomeNotFound(msg=msg)
baudrate = int(cfg.get('baudrate', 9600))
# Setup our serial connection to the given port.
self.serial = None
try:
self.serial = rs232.SerialData(port=self._port, baudrate=baudrate)
except Exception as err:
raise error.DomeNotFound(err)
def test_hooked_io(handler):
protocol_hooked.Serial = HookedSerialHandler
ser = rs232.SerialData(port='hooked://', open_delay=0)
# Peek inside, it should have a PySerial instance as member ser.
assert ser.ser
assert ser.ser.__class__.__name__ == 'HookedSerialHandler'
print(str(ser.ser))
# Open is automatically called by SerialData.
assert ser.is_connected
# Can read many identical lines from ser.
first_line = None
for n in range(20):
line = ser.read(retry_delay=10, retry_limit=20)
if first_line:
assert line == first_line
else:
first_line = line
assert 'message' in line
reading = ser.get_reading()
assert reading[1] == line
# Can write to the "device" many times.
line = 'abcdefghijklmnop' * 30
line = line + '\r\n'
for n in range(20):
assert len(line) == ser.write(line)
ser.disconnect()
assert not ser.is_connected
def test_basic_io(handler):
protocol_buffers.ResetBuffers(b'abc\r\ndef\n')
ser = rs232.SerialData(port='buffers://',
open_delay=0.01,
retry_delay=0.01,
retry_limit=2)
# Peek inside, it should have a BuffersSerial instance as member ser.
assert isinstance(ser.ser, protocol_buffers.BuffersSerial)
# Can read two lines. Read the first as a sensor reading:
(ts, line) = ser.get_reading()
assert 'abc\r\n' == line
# Read the second line from the read buffer.
assert 'def\n' == ser.read(retry_delay=0.1, retry_limit=10)
# Another read will fail, having exhausted the contents of the read buffer.
assert '' == ser.read()
# Can write to the "device", the handler will accumulate the results.
assert 5 == ser.write('def\r\n')
assert 6 == ser.write('done\r\n')
assert b'def\r\ndone\r\n' == protocol_buffers.GetWBufferValue()
# If we add more to the read buffer, we can read again.
protocol_buffers.SetRBufferValue(b'line1\r\nline2\r\ndangle')
assert 'line1\r\n' == ser.read(retry_delay=10, retry_limit=20)
assert 'line2\r\n' == ser.read(retry_delay=10, retry_limit=20)
assert 'dangle' == ser.read(retry_delay=10, retry_limit=20)
ser.disconnect()
assert not ser.is_connected
def test_detect_uninstalled_scheme():
"""If our handlers aren't installed, will detect unknown scheme."""
# See https://pythonhosted.org/pyserial/url_handlers.html#urls for info on the
# standard schemes that are supported by PySerial.
with pytest.raises(ValueError):
# The no_op scheme references one of our test handlers, but it shouldn't be
# accessible unless we've added our package to the list to be searched.
rs232.SerialData(port='no_op://')
def test_non_existent_device():
"""Doesn't complain if it can't find the device."""
port = '/dev/tty12345698765'
ser = rs232.SerialData(port=port)
assert not ser.is_connected
assert port == ser.name
# Can't connect to that device.
with pytest.raises(error.BadSerialConnection):
ser.connect()
assert not ser.is_connected
def __init__(self, *args, **kwargs):
"""Initialize an AbstractSerialMount for the port defined in the config.
Opens a connection to the serial device, if it is valid.
"""
super(AbstractSerialMount, self).__init__(*args, **kwargs)
# Setup our serial connection at the given port
try:
self._port = self.config['mount']['port']
except KeyError:
self.logger.error(
'No mount port specified, cannot create mount\n {}'.format(
self.config['mount']))
self.serial = rs232.SerialData(port=self._port, baudrate=9600)
def test_basic_no_op(handler):
# Confirm we can create the SerialData object.
ser = rs232.SerialData(port='no_op://', name='a name', open_delay=0)
assert ser.name == 'a name'
# Peek inside, it should have a NoOpSerial instance as member ser.
assert ser.ser
assert isinstance(ser.ser, NoOpSerial)
# Open is automatically called by SerialData.
assert ser.is_connected
# connect() is idempotent.
ser.connect()
assert ser.is_connected
# Several passes of reading, writing, disconnecting and connecting.
for _ in range(3):
# no_op handler doesn't do any reading, analogous to /dev/null, which
# never produces any output.
assert '' == ser.read(retry_delay=0.01, retry_limit=2)
assert b'' == ser.read_bytes(size=1)
assert 0 == ser.write('abcdef')
ser.reset_input_buffer()
# Disconnect from the serial port.
assert ser.is_connected
ser.disconnect()
assert not ser.is_connected
# Should no longer be able to read or write.
with pytest.raises(AssertionError):
ser.read(retry_delay=0.01, retry_limit=1)
with pytest.raises(AssertionError):
ser.read_bytes(size=1)
with pytest.raises(AssertionError):
ser.write('a')
ser.reset_input_buffer()
# And we should be able to reconnect.
assert not ser.is_connected
ser.connect()
assert ser.is_connected
def test_missing_port():
with pytest.raises(ValueError):
rs232.SerialData()