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message.py
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message.py
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"""
Paparazzi message representation
"""
from __future__ import absolute_import, division, print_function
import sys
import json
import struct
from . import messages_xml_map
# import messages_xml_map
class PprzMessageError(Exception):
def __init__(self, message, inner_exception=None):
self.message = message
self.inner_exception = inner_exception
self.exception_info = sys.exc_info()
def __str__(self):
return self.message
class PprzMessage(object):
"""base Paparazzi message class"""
def __init__(self, class_name, msg):
self._class_name = class_name
if isinstance(msg, int):
self._id = msg
self._name = messages_xml_map.get_msg_name(class_name, msg)
else:
self._name = msg
self._id = messages_xml_map.get_msg_id(class_name, msg)
self._fieldnames = messages_xml_map.get_msg_fields(class_name, self._name)
self._fieldtypes = messages_xml_map.get_msg_fieldtypes(class_name, self._id)
self._fieldcoefs = messages_xml_map.get_msg_fieldcoefs(class_name, self._id)
self._fieldvalues = []
# set empty values according to type
for t in self._fieldtypes:
if t == "char[]":
self._fieldvalues.append('')
elif '[' in t:
self._fieldvalues.append([0])
else:
self._fieldvalues.append(0)
@property
def name(self):
"""Get the message name."""
return self._name
@property
def msg_id(self):
"""Get the message id."""
return self._id
@property
def msg_class(self):
"""Get the message class."""
return self._class_name
@property
def fieldnames(self):
"""Get list of field names."""
return self._fieldnames
@property
def fieldvalues(self):
"""Get list of field values."""
return self._fieldvalues
@property
def fieldtypes(self):
"""Get list of field types."""
return self._fieldtypes
@property
def fieldcoefs(self):
"""Get list of field coefs."""
return self._fieldcoefs
def fieldbintypes(self, t):
"""Get type and length for binary format"""
data_types = {
'float': ['f', 4],
'double': ['d', 8],
'uint8': ['B', 1],
'uint16': ['H', 2],
'uint32': ['L', 4],
'int8': ['b', 1],
'int16': ['h', 2],
'int32': ['l', 4],
'char': ['c', 1]
}
base_type = t.split('[')[0]
return data_types[base_type]
def get_field(self, idx):
"""Get field value by index."""
return self._fieldvalues[idx]
def __getattr__(self, attr):
# Try to dynamically return the field value for the given name
for idx, f in enumerate(self.fieldnames):
if f == attr:
return self.fieldvalues[idx]
raise AttributeError("No such attribute %s" % attr)
def __getitem__(self, key):
# Try to dynamically return the field value for the given name
for idx, f in enumerate(self.fieldnames):
if f == key:
return self.fieldvalues[idx]
raise AttributeError("Msg %s has no field of name %s" % (self.name, key))
def __setitem__(self, key, value):
self.set_value_by_name(key, value)
def set_values(self, values):
if len(values) == len(self.fieldnames):
self._fieldvalues = values
else:
print("set values %i %i" % (len(values), len(self.fieldnames)))
raise PprzMessageError("Error: fields not matching")
def set_value_by_name(self, name, value):
# Try to set a value from its name
for idx, f in enumerate(self.fieldnames):
if f == name:
self._fieldvalues[idx] = value
return
raise AttributeError("Msg %s has no field of name %s" % (self.name, key))
def __str__(self):
ret = '%s.%s {' % (self.msg_class, self.name)
for idx, f in enumerate(self.fieldnames):
ret += '%s : %s, ' % (f, self.fieldvalues[idx])
ret = ret[0:-2] + '}'
return ret
def to_dict(self, payload_only=False):
d = {}
if not payload_only:
d['msgname'] = self.name
d['msgclass'] = self.msg_class
for idx, f in enumerate(self.fieldnames):
d[f] = self.fieldvalues[idx]
return d
def to_json(self, payload_only=False):
return json.dumps(self.to_dict(payload_only))
def payload_to_ivy_string(self):
ivy_str = ''
for idx, t in enumerate(self.fieldtypes):
if "char[" in t:
ivy_str += '"' + self.fieldvalues[idx] + '"'
elif '[' in t:
ivy_str += ','.join([str(x) for x in self.fieldvalues[idx]])
else:
ivy_str += str(self.fieldvalues[idx])
ivy_str += ' '
return ivy_str
def payload_to_binary(self):
struct_string = "<"
data = []
length = 0
for idx, t in enumerate(self.fieldtypes):
bin_type = self.fieldbintypes(t)
struct_string += bin_type[0]
array_length = 1
if "char[" in t:
array_length = len(self.fieldvalues[idx])
for c in self.fieldvalues[idx]:
data.append(int(c))
elif '[' in t:
array_length = len(self.fieldvalues[idx])
for x in self.fieldvalues[idx]:
data.append(x)
else:
data.append(self.fieldvalues[idx])
length += bin_type[1] * array_length
msg = struct.pack(struct_string, *data)
return msg
def binary_to_payload(self, data):
msg_offset = 0
values = []
for idx, t in enumerate(self.fieldtypes):
bin_type = self.fieldbintypes(t)
if '[' in t:
array_length = data[msg_offset]
msg_offset += 1
array_value = []
for count in range(0, array_length):
array_value.append(struct.unpack('<' + bin_type[0], data[msg_offset:msg_offset + bin_type[1]])[0])
msg_offset = msg_offset + bin_type[1]
values.append(array_value)
else:
value = struct.unpack('<' + bin_type[0], data[msg_offset:msg_offset + bin_type[1]])[0]
msg_offset = msg_offset + bin_type[1]
values.append(value)
self.set_values(values)
def test():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("-f", "--file", help="path to messages.xml file")
parser.add_argument("-c", "--class", help="message class", dest="msg_class", default="telemetry")
args = parser.parse_args()
messages_xml_map.parse_messages(args.file)
messages = [PprzMessage(args.msg_class, n) for n in messages_xml_map.get_msgs(args.msg_class)]
print("Listing %i messages in '%s' msg_class" % (len(messages), args.msg_class))
for msg in messages:
print(msg)
if __name__ == '__main__':
test()