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import json
import os
from os.path import abspath, join, splitext
import re
import subprocess
from celery import current_task
from celery.utils.log import get_task_logger
from datetime import datetime
from pathlib import Path
from tempfile import mkstemp
from django.conf import settings
from django.db.models import Case, F, Value, When
from django.utils.timezone import now
from simulationAPI.models import Task
from simulationAPI.helpers.scilab_manager import start_scilab, upload, remove, rmdir
logger = get_task_logger(__name__)
XmlToXcos = join(settings.BASE_DIR, 'Xcos/XmlToXcos.sh')
SCILAB_DIR = abspath(settings.SCILAB_DIR)
SCILAB = join(SCILAB_DIR, 'bin', 'scilab-adv-cli')
# handle scilab startup
SCILAB_START = (
"try;funcprot(0);lines(0,120);"
"clearfun('messagebox');"
"function messagebox(msg,title,icon,buttons,modal),disp(msg),endfunction;"
"funcprot(1);"
"catch;[error_message,error_number,error_line,error_func]=lasterror();"
"disp(error_message,error_number,error_line,error_func);exit(3);end;"
)
SCILAB_END = (
"catch;[error_message,error_number,error_line,error_func]=lasterror();"
"disp(error_message,error_number,error_line,error_func);exit(2);end;exit;"
)
SCILAB_CMD = [SCILAB,
"-noatomsautoload",
"-nogui",
"-nouserstartup",
"-nb",
"-nw",
"-e", SCILAB_START]
LOGFILEFD = 123
START_STATES = ["STARTED"]
END_STATES = ["SUCCESS", "FAILURE", "CANCELED"]
class CannotRunParser(Exception):
""" Base class for exceptions in this module. """
def update_task_status(task, task_id, status, meta=None):
# Update Celery backend state
if task is not None:
try:
task.update_state(state=status, meta=meta or {})
except Exception as e:
logger.error(f"Error updating Celery task state: {e}")
# Update Django database
if task_id is not None:
Task.objects.filter(task_id=task_id).update(
status=status,
start_time=Case(
When(status__in=START_STATES, then=Value(now())),
default=F("start_time")
),
end_time=Case(
When(status__in=END_STATES, then=Value(now())),
default=F("end_time")
)
)
def CreateXml(file_path, parameters, task_id, workspace_file):
parameters = json.loads(parameters)
current_dir = settings.MEDIA_ROOT + '/' + str(task_id)
# Make Unique Directory for simulation to run
Path(current_dir).mkdir(parents=True, exist_ok=True)
try:
(xcosfilebase, __) = splitext(file_path)
xcosfile = xcosfilebase + '.xcos'
logger.info('will run %s %s %s', 'XmlToXcos', file_path, workspace_file)
if workspace_file is None:
workspace_file = ''
proc = subprocess.Popen([XmlToXcos, file_path, workspace_file],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdout, stderr) = proc.communicate()
if proc.returncode != 0:
logger.error('%s error encountered', 'XmlToXcos')
logger.error('rv=%s', proc.returncode)
msg = 'exited with error'
if stdout:
logger.info('Stdout:\n%s', stdout.decode())
if stderr:
stderr = stderr.decode()
logger.error('Stderr:\n%s', stderr)
# Get last non-empty line from stderr
last_line = next((line for line in reversed(stderr.strip().splitlines()) if line.strip()), None)
if last_line:
msg = last_line
raise CannotRunParser(msg)
logger.info('Ran %s', 'XmlToXcos')
return xcosfile
except Exception as e:
logger.exception('Encountered Exception:')
logger.info('removing %s', file_path)
remove(file_path)
target = os.listdir(current_dir)
for item in target:
logger.info('removing %s', item)
remove(join(current_dir, item))
logger.info('removing %s', current_dir)
rmdir(current_dir)
logger.info('Deleted Files')
raise e
def CreateXcos(file_path, parameters, task_id, workspace_file):
xcosfile = CreateXml(file_path, parameters, task_id, workspace_file)
return xcosfile
def ExecXml(task, task_name, workspace_file):
task_id = task.task_id
file_path = task.file.path
current_dir = settings.MEDIA_ROOT + '/' + str(task_id)
try:
# Create xcos file
xcosfile = CreateXml(file_path, task.parameters, task_id, workspace_file)
upload(task.session, task, xcosfile)
result = start_scilab(task.session, task, xcosfile)
if result == "":
logger.info('Simulation completed successfully for task %s', task_id)
return 'Streaming'
else:
logger.warning('Simulation failed for task %s: %s', task_id, result)
return 'Failure'
except Exception as e:
logger.exception('Encountered Exception during XML Execution:')
logger.info('Cleaning up files for task %s', task_id)
# Cleanup
remove(file_path)
target = os.listdir(current_dir)
for item in target:
remove(join(current_dir, item))
rmdir(current_dir)
logger.info('Deleted Files and Directory for task %s', task_id)
raise e
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