Add async-timeout local dependency for zeroconf

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "ifaddr"]
 	path = ifaddr
 	url = https://github.com/pydron/ifaddr
+[submodule "async-timeout"]
+	path = async-timeout
+	url = https://github.com/aio-libs/async-timeout

CMakeLists.txt

@@ -34,6 +34,10 @@ install(DIRECTORY ifaddr
     DESTINATION lib/cura/plugins/OctoPrintPlugin/ifaddr
 )
 
+install(DIRECTORY async-timeout
+    DESTINATION lib/cura/plugins/OctoPrintPlugin/async-timeout
+)
+
 install(DIRECTORY i18n
     DESTINATION lib/cura/plugins/OctoPrintPlugin/i18n
 )

OctoPrintOutputDevicePlugin.py

@@ -40,7 +40,7 @@
 else:
     try:
         # import the included version of python-zeroconf
-        # expand search path so local copies of zeroconf and ifaddr can be imported
+        # expand search path so local copies of zeroconf, ifaddr and async-timeout can be imported
         import sys
         import importlib.util
 
@@ -55,6 +55,7 @@
 
         plugin_path = os.path.dirname(os.path.abspath(__file__))
         sys.path.insert(0, os.path.join(plugin_path, "ifaddr"))
+        sys.path.insert(0, os.path.join(plugin_path, "async-timeout"))
 
         zeroconf_spec = importlib.util.spec_from_file_location(
             "zeroconf",
@@ -80,7 +81,7 @@
         sys.path = original_path
 
         Logger.log("d", "Using included Zeroconf module version %s" % zeroconf_version)
-    except (FileNotFoundError, ImportError) as exception:
+    except (FileNotFoundError, ModuleNotFoundError, ImportError) as exception:
         # fall back to the system-installed version, or what comes with Cura
         Logger.logException("e", "Failed to load included version of Zeroconf module")
 

README.md

@@ -71,5 +71,8 @@ older versions of Cura because that version has bugs.
 ### [ifaddr](https://github.com/pydron/ifaddr) as maintained by pydron.
 ifaddr is licensed under the MIT license.
 
-The module is included in the OctoPrintPlugin because it is a dependency of
-python-zeroconf and it is not included with older versions of Cura
+### [async-timeout](https://github.com/aio-libs/async-timeout) as maintained by aio-libs
+async-timeout is licensed under the Apache License, Version 2.0.
+
+ifaddr and async-timeout are included in the OctoPrintPlugin because it is a dependency
+of python-zeroconf and they are not included with older versions of Cura.