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Double lock check to make get_plugin thread-safe

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This commit is contained in:
Fabio Manganiello 2018-08-22 02:11:51 +02:00
parent 105d5bb2fc
commit 4c6b38a6e2
1 changed files with 6 additions and 6 deletions
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12
platypush/context/__init__.py
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@ -71,8 +71,12 @@ def get_plugin(plugin_name, reload=False):
global plugins
global plugins_init_locks
if plugin_name in plugins and not reload:
return plugins[plugin_name]
if plugin_name not in plugins_init_locks:
plugins_init_locks[plugin_name] = Lock()
with plugins_init_locks[plugin_name]:
if plugin_name in plugins and not reload:
return plugins[plugin_name]
try:
plugin = importlib.import_module('platypush.plugins.' + plugin_name)
@ -91,13 +95,9 @@ def get_plugin(plugin_name, reload=False):
try:
plugin_class = getattr(plugin, cls_name)
if plugin_name not in plugins_init_locks:
plugins_init_locks[plugin_name] = Lock()
with plugins_init_locks[plugin_name]:
plugin = plugin_class(**plugin_conf)
plugins[plugin_name] = plugin
except AttributeError as e:
logger.warning('No such class in {}: {}'.format(plugin_name, cls_name))
raise RuntimeError(e)