149 lines
6.5 KiB
Python
149 lines
6.5 KiB
Python
from pandas import DataFrame, read_csv, Series
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from numpy import int64
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from os import path, remove
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from pickle import load
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from typing import Callable
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from ArbID import ArbID
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from J1979 import J1979
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from PipelineTimer import PipelineTimer
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class PreProcessor:
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def __init__(self, data_filename: str, id_output_filename: str, j1979_output_filename: str):
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self.data_filename: str = data_filename
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self.id_output_filename: str = id_output_filename
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self.j1979_output_filename: str = j1979_output_filename
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self.data: DataFrame = None
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self.import_time: float = 0.0
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self.dictionary_time: float = 0.0
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self.total_time: float = 0.0
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def import_csv(self, a_timer: PipelineTimer, filename):
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def hex2int(x):
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if x == '':
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return 0
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return int(x, 16)
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def fix_time(x):
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try:
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return float(str(x)[:-1])
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except ValueError:
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# There may have been a newline the capture device was trying to write when turned off.
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return None
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# Used by pd.read_csv to apply the functions to the respective column vectors in the .csv file
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convert_dict = {'time': fix_time, 'id': hex2int, 'dlc': hex2int, 'b0': hex2int, 'b1': hex2int, 'b2': hex2int,
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'b3': hex2int, 'b4': hex2int, 'b5': hex2int, 'b6': hex2int, 'b7': hex2int}
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print("\nReading in " + self.data_filename + "...")
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a_timer.start_function_time()
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self.data = read_csv(filename,
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header=None,
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names=['time', 'id', 'dlc', 'b0', 'b1',
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'b2', 'b3', 'b4', 'b5', 'b6', 'b7'],
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skiprows=7,
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delim_whitespace=True,
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converters=convert_dict,
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index_col=0)
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print(self.data)
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a_timer.set_can_csv_to_df()
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# sanity check output of the original data
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# print("\nSample of the original data:")
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# print(self.data.head(5), "\n")
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@staticmethod
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def generate_j1979_dictionary(j1979_data: DataFrame) -> dict:
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d = {}
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services = j1979_data.groupby('b2')
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for uds_pid, data in services:
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d[uds_pid] = J1979(uds_pid, data)
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return d
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def generate_arb_id_dictionary(self,
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a_timer: PipelineTimer,
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normalize_strategy: Callable,
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time_conversion: int = 1000,
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freq_analysis_accuracy: float = 0.0,
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freq_synchronous_threshold: float = 0.0,
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force: bool = False) -> (dict, dict):
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if path.isfile(self.id_output_filename):
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if force:
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# Remove any existing pickled Arb ID dictionary and create one based on this data.
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remove(self.id_output_filename)
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remove(self.j1979_output_filename)
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self.import_csv(a_timer, self.data_filename)
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else:
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arb_id_dict = load(open(self.id_output_filename, "rb"))
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j1979_dict = load(open(self.j1979_output_filename, "rb"))
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return arb_id_dict, j1979_dict
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else:
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self.import_csv(a_timer, self.data_filename)
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id_dictionary = {}
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j1979_dictionary = {}
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a_timer.start_function_time()
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for arb_id in Series.unique(self.data['id']):
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if isinstance(arb_id, int64):
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if arb_id == 2015:
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# This is the J1979 requests (if any) (ID 0x7DF = 2015). Just ignore it.
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continue
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elif arb_id == 2024:
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# This is the J1979 responses (ID 0x7DF & 0x8 = 0x7E8 = 2024)
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j1979_data = self.data.loc[self.data['id'] == arb_id].copy(
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)
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j1979_data.drop('dlc', axis=1, inplace=True)
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j1979_data.drop('id', axis=1, inplace=True)
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a_timer.start_nested_function_time()
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j1979_dictionary = self.generate_j1979_dictionary(
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j1979_data)
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a_timer.set_j1979_creation()
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elif arb_id > 0:
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a_timer.start_iteration_time()
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this_id = ArbID(arb_id)
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this_id.original_data = self.data.loc[self.data['id'] == arb_id]
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this_id.original_data = this_id.original_data.copy() # type: DataFrame
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# Check if the Arbitration ID always used the same DLC. If not, ignore it.
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# We can effectively ignore this Arb ID by not adding it to the Arb ID dictionary.
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if this_id.original_data['dlc'].nunique() != 1:
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continue
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this_id.dlc = this_id.original_data['dlc'].iloc[0]
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this_id.original_data.drop('dlc', axis=1, inplace=True)
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this_id.original_data.drop('id', axis=1, inplace=True)
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# If DLC < 8, we can automatically drop data column vectors > DLC.
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# E.G. drop bytes "B7" and "B6" if DLC is 6; those are padding data injected by can-dump and were
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# not actually on the bus.
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if this_id.dlc < 8:
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for i in range(this_id.dlc, 8):
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this_id.original_data.drop(
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'b' + str(i), axis=1, inplace=True)
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# Check if there are duplicate index values and correct them.
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if not this_id.original_data.index.is_unique:
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correction_mask = this_id.original_data.index.duplicated()
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this_id.original_data = this_id.original_data[~correction_mask]
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this_id.generate_binary_matrix_and_tang(
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a_timer, normalize_strategy)
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this_id.analyze_transmission_frequency(time_convert=time_conversion,
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ci_accuracy=freq_analysis_accuracy,
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synchronous_threshold=freq_synchronous_threshold)
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id_dictionary[arb_id] = this_id
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a_timer.set_arb_id_creation()
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a_timer.set_raw_df_to_arb_id_dict()
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return id_dictionary, j1979_dictionary
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