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hww: fix threading issue in DeviceMgr: enumerate_func needs self.lock

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E | gui.qt.main_window.[test_ms_p2wsh_2of3_cc3132_trezort_cc3133] | on_error
Traceback (most recent call last):
  File "...\electrum\electrum\gui\qt\util.py", line 794, in run
    result = task.task()
  File "...\electrum\electrum\plugins\hw_wallet\qt.py", line 232, in trigger_pairings
    devices = devmgr.scan_devices()
  File "...\electrum\electrum\plugin.py", line 376, in func_wrapper
    return func(self, *args, **kwargs)
  File "...\electrum\electrum\plugin.py", line 656, in scan_devices
    for f in self.enumerate_func:
RuntimeError: Set changed size during iteration
This commit is contained in:
SomberNight 2020-04-08 18:46:28 +02:00
parent bf067f7558
commit 7a4acb05f2
No known key found for this signature in database
GPG key ID: B33B5F232C6271E9
1 changed files with 6 additions and 3 deletions
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9
electrum/plugin.py
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@ -364,7 +364,7 @@ class DeviceMgr(ThreadJob):
# pair.
self.recognised_hardware = set()
# Custom enumerate functions for devices we don't know about.
self.enumerate_func = set()
self._enumerate_func = set() # Needs self.lock.
# locks: if you need to take multiple ones, acquire them in the order they are defined here!
self._scan_lock = threading.RLock()
self.lock = threading.RLock()
@ -395,7 +395,8 @@ class DeviceMgr(ThreadJob):
self.recognised_hardware.add(pair)
def register_enumerate_func(self, func):
self.enumerate_func.add(func)
with self.lock:
self._enumerate_func.add(func)
def create_client(self, device: 'Device', handler: Optional['HardwareHandlerBase'],
plugin: 'HW_PluginBase') -> Optional['HardwareClientBase']:
@ -664,7 +665,9 @@ class DeviceMgr(ThreadJob):
devices = self._scan_devices_with_hid()
# Let plugin handlers enumerate devices we don't know about
for f in self.enumerate_func:
with self.lock:
enumerate_funcs = list(self._enumerate_func)
for f in enumerate_funcs:
try:
new_devices = f()
except BaseException as e: