def _check_parameters(self, parameter_list, type_list):
"""
Checks that every parameter in the parameter list corresponds to the
type in type_list. Then returns an array with the string conversion of
each value.
Parameters
----------
parameter_list: list
The parameters to check and convert
type_list: list
List of types for each parameter
Returns
-------
parameter_string_list : list
List of string conversions of each parameter
"""
parameter_string_list = []
for i, parameter in enumerate(parameter_list):
if not isinstance(parameter, type_list[i]):
raise GstcError(
"%s TypeError: parameter %i: expected %s, '%s found" %
(inspect.stack()[1].function, i, type_list[i],
type(parameter)), GstcErrorCode.GSTC_MALFORMED)
if type_list[i] == str:
parameter_string_list += [parameter]
elif type_list[i] == bool:
if parameter:
parameter_string_list += ['true']
else:
parameter_string_list += ['false']
else:
parameter_string_list += [str(parameter)]
return parameter_string_list
def _send_cmd_line(self, cmd_line):
"""
Send a command using an abstract IPC and wait for the response.
Parameters
----------
cmd_line : string list
Command to be send
Raises
------
GstdError
Error is triggered when Gstd IPC fails
GstcError
Error is triggered when the Gstd python client fails internally
Returns
-------
result : dictionary
Response from the IPC
"""
try:
cmd = cmd_line[0]
jresult = self._ipc.send(cmd_line, timeout=self._timeout)
result = json.loads(jresult)
if result['code'] != GstcErrorCode.GSTC_OK.value:
self._logger.error('%s error: %s' % (cmd,
result['description']))
raise GstdError(result['description'],
result['code'])
return result
except ConnectionRefusedError as e:
raise GstcError("Failed to communicate with Gstd",
GstcErrorCode.GSTC_UNREACHABLE)\
from e
except TypeError as e:
raise GstcError('GstClient bad command',
GstcErrorCode.GSTC_TYPE_ERROR) from e
except BufferError as e:
raise GstcError('GstClient received a response bigger ' +
'than the maximum size allowed',
GstcErrorCode.GSTC_RECV_ERROR) from e
except TimeoutError as e:
raise GstcError('GstClient time out ocurred',
GstcErrorCode.GSTC_BUS_TIMEOUT) from e
def ping_gstd(self):
"""
Test if Gstd responds in the configured address and port
Raises
------
GstcError
Error is triggered when GstClient fails
GstdError
Error is triggered when Gstd IPC fails
"""
self._logger.info('Sending ping to Gstd')
try:
jresult = self._ipc.send(['list_pipelines'], timeout=1)
# Verify correct data format
result = json.loads(jresult)
if ('description' in result and
result['description'] != 'Success'):
raise GstdError(result['description'],
result['code'])
except json.JSONDecodeError as e:
err_msg = 'Gstd corrupted response'
self._logger.error(err_msg)
raise GstcError(err_msg,
GstcErrorCode.GSTC_MALFORMED) from e
except ConnectionRefusedError as e:
err_msg = 'Error contacting Gstd'
self._logger.error(err_msg)
raise GstcError(err_msg,
GstcErrorCode.GSTC_UNREACHABLE) from e
except BufferError as e:
raise GstcError('GstClient received a buffer bigger ' +
'than the maximum size allowed',
GstcErrorCode.GSTC_RECV_ERROR) from e
except TimeoutError as e:
raise GstcError('GstClient time out ocurred',
GstcErrorCode.GSTC_TIMEOUT) from e