80 lines
2.3 KiB
Python
80 lines
2.3 KiB
Python
# (c) Copyright 2021 by Coinkite Inc. This file is covered by license found in COPYING-CC.
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#
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# imptask.py -- important async tasks that shouldn't die
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#
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import sys, uasyncio, ckcc
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def die_with_debug(exc):
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try:
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is_debug = ckcc.vcp_enabled(None) or ckcc.is_debug_build()
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except:
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# robustness
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is_debug = False
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if is_debug and isinstance(exc, KeyboardInterrupt):
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# preserve GUI state, but want to see where we are
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print("KeyboardInterrupt")
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raise exc
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elif isinstance(exc, SystemExit):
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# Ctrl-D and warm reboot cause this, not bugs
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raise exc
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else:
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# show stacktrace for debug photos
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try:
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import uio, ux
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tmp = uio.StringIO()
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sys.print_exception(exc, tmp)
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msg = tmp.getvalue()
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del tmp
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print(msg)
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ux.show_fatal_error(msg)
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except: pass
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# securely die (wipe memory)
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if not is_debug:
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try:
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import callgate
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callgate.show_logout(1)
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except: pass
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class ImportantTask:
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def __init__(self):
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self.tasks = dict()
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uasyncio.get_event_loop().set_exception_handler(self.handle_exc)
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def handle_exc(self, loop, context):
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# Unhandled exception in a task.
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task = context['future']
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# See if it matters: some tasks are short-lived and exception in them
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# may not be fatal or even serious
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for name, t in self.tasks.items():
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if t == task:
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print("Panic stop: %r has died" % name)
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die_with_debug(context["exception"])
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# not reached, except on simulator:
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break
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else:
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# uncaught exception in an unnamed (and unimportant) task
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print("UNNAMED: " + context["message"])
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# sys.print_exception(context["exception"])
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print("... future: %r" % context.get("future", '?'))
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def start_task(self, name, awaitable):
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# start a critical task and watch for it to never die
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print("Start: %s" % name)
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task = uasyncio.create_task(awaitable)
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self.tasks[name] = task
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return task
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def task_name(self, t):
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for k, v in self.tasks.items():
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if v == t:
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return k
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return None
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IMPT = ImportantTask()
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# EOF
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