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beeware / briefcase

Tools to support converting a Python project into a standalone native application.
https://briefcase.readthedocs.io/
BSD 3-Clause "New" or "Revised" License
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[Windows] ``briefcase run`` Spawns Multple Windows in existence of Daemon Process #2007

Closed Pairman closed 1 month ago

Pairman commented 1 month ago

Describe the bug

I'm working on a project where it needs aiohttp to run a web server. It must be be ran in a main thread, so I have to put its logic under a daemon process with multiprocessing.Process(target = ..., daemon = True).

It totally works on Android, Ubuntu on Fedora, except Windows. My users on Windows have reported that they cannot access the web server with the built-in WebView nor their browsers, showing ERR_CONNECTION_REFUSED, which indicates that the web server isn't started properly.

So I took a look into this using briefcase dev and briefcase run -u. If I use briefcase dev, the web broswer (or daemon process) can be started normally and can be accessed. However with briefcase run -u, my APP will be launched for multiple times indefinitely, resulting in a ton of windows, and the web server cannot be accessed. And if I remove the multiprocessing.Process(...).start(), briefcase won't spawn me numerous windows. The .msi from briefcase package won't spawn multiple windows, but as I said, its web server cannot be started normally too.

I reproduced exactly these bugs in the following simplified setup. Note: The daemon = True for multiprocessing.Process is not necessary for this bug to happen. And a simple time.sleep() in the daemon process also causes these bug.

Hope this can be fixed. Thanks.

Steps to reproduce

  1. On Windows
  2. Create a simple briefcase project and run a daemon process with multiprocessing.Process along with the main GUI.
  3. Execute briefcase run -u, APP windows will be spawned non-stop. And the thing in the daemon process won't working properly.
  4. Install the .msi from briefcase package, the thing in the daemon process won't working properly too.

Expected behavior

  1. briefcase run shouldn't create multiple windows for my APP.
  2. Things in the daemon process (web server for me) should work normally when using briefcase run or the installed package, on Windows.

Screenshots

No response

Environment

OS: Windows-11-10.0.22631-SP0 AMD64 Python exe: C:\Users\Pairman\Downloads\bw\venv\Scripts\python.exe Python version: 3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] Virtual env: True Briefcase: 0.3.19 Toga: toga-0.4.7 toga-core-0.4.7 toga-winforms-0.4.7

Logs

briefcase create:

``` Date/Time: 2024-09-26 20:00:36 Command line: C:\Users\Pairman\Downloads\bw\venv\Scripts\briefcase create --log OS Release: Windows 11 OS Version: 10.0.22631 Architecture: AMD64 Platform: Windows-11-10.0.22631-SP0 Python exe: C:\Users\Pairman\Downloads\bw\venv\Scripts\python.exe Python version: 3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] Virtual env: True Conda env: False Briefcase: 0.3.19 Target platform: windows Target format: app Environment Variables: ALLUSERSPROFILE=C:\ProgramData APPDATA=C:\Users\Pairman\AppData\Roaming ASL.LOG=Destination=file COMMONPROGRAMFILES=C:\Program Files\Common Files COMMONPROGRAMFILES(X86)=C:\Program Files (x86)\Common Files COMMONPROGRAMW6432=C:\Program Files\Common Files COMPUTERNAME=PAIRFACE COMSPEC=C:\Windows\system32\cmd.exe DRIVERDATA=C:\Windows\System32\Drivers\DriverData HOMEDRIVE=C: HOMEPATH=\Users\Pairman LOCALAPPDATA=C:\Users\Pairman\AppData\Local LOGONSERVER=\\PAIRFACE NUMBER_OF_PROCESSORS=8 ONEDRIVE=C:\Users\Pairman\OneDrive OS=Windows_NT PATH=C:\Users\Pairman\Downloads\bw\venv\Scripts;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\WireGuard\;C:\Program Files\nodejs\;C:\Users\Pairman\scoop\shims;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\Scripts\;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\;C:\Users\Pairman\AppData\Local\Microsoft\WindowsApps;C:\Users\Pairman\AppData\Local\Programs\Fiddler;C:\Users\Pairman\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\Pairman\AppData\Local\Programs\platform-tools;C:\Users\Pairman\AppData\Roaming\dragonwell21\bin;C:\Users\Pairman\Downloads\ios-webkit-debug-proxy-1.9.1-win64-bin;C:\Users\Pairman\AppData\Roaming\npm PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.CPL PROCESSOR_ARCHITECTURE=AMD64 PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 140 Stepping 1, GenuineIntel PROCESSOR_LEVEL=6 PROCESSOR_REVISION=8c01 PROGRAMDATA=C:\ProgramData PROGRAMFILES=C:\Program Files PROGRAMFILES(X86)=C:\Program Files (x86) PROGRAMW6432=C:\Program Files PSMODULEPATH=C:\Users\Pairman\Documents\WindowsPowerShell\Modules;C:\Program Files\WindowsPowerShell\Modules;C:\Windows\system32\WindowsPowerShell\v1.0\Modules PUBLIC=C:\Users\Public SESSIONNAME=Console SYSTEMDRIVE=C: SYSTEMROOT=C:\Windows TEMP=C:\Users\Pairman\AppData\Local\Temp TMP=C:\Users\Pairman\AppData\Local\Temp USERDOMAIN=PAIRFACE USERDOMAIN_ROAMINGPROFILE=PAIRFACE USERNAME=Pairman USERPROFILE=C:\Users\Pairman VIRTUAL_ENV=C:\Users\Pairman\Downloads\bw\venv VIRTUAL_ENV_PROMPT=venv WINDIR=C:\Windows WSLENV=WT_SESSION:WT_PROFILE_ID: WT_PROFILE_ID={61c54bbd-c2c6-5271-96e7-009a87ff44bf} WT_SESSION=5ad5d309-16eb-4ce3-8014-e6af6d8d4cb3 _OLD_VIRTUAL_PATH=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\WireGuard\;C:\Program Files\nodejs\;C:\Users\Pairman\scoop\shims;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\Scripts\;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\;C:\Users\Pairman\AppData\Local\Microsoft\WindowsApps;C:\Users\Pairman\AppData\Local\Programs\Fiddler;C:\Users\Pairman\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\Pairman\AppData\Local\Programs\platform-tools;C:\Users\Pairman\AppData\Roaming\dragonwell21\bin;C:\Users\Pairman\Downloads\ios-webkit-debug-proxy-1.9.1-win64-bin;C:\Users\Pairman\AppData\Roaming\npm pyproject.toml: # This project was generated with 0.3.19 using template: https://github.com/beeware/briefcase-template@v0.3.19 [tool.briefcase] project_name = "Hello World" bundle = "com.example" version = "0.0.1" url = "https://example.com/helloworld" license.file = "LICENSE" author = "Jane Developer" author_email = "jane@example.com" [tool.briefcase.app.helloworld] formal_name = "Hello World" description = "Hello World" long_description = "Hello World" sources = ["src/helloworld"] requires = ["aiohttp", "toga"] [tool.briefcase.app.helloworld.windows] requires = ["toga-winforms~=0.4.5"] Briefcase Log: [19:59:55] create.py:884 [helloworld] Generating application template... create.py:884 Assigning helloworld an application GUID of 93bbf2ae-12d0-580c-aeb0-965dc4c04b69 __init__.py:91 Using app template: https://github.com/beeware/briefcase-windows-app-template.git, branch v0.3.19 base.py:1090 [20:00:06] Cmd('git') failed due to: exit code(128) base.py:977 cmdline: git fetch -v -- origin base.py:977 stderr: 'fatal: unable to access 'https://github.com/beeware/briefcase-windows-app-template.git/': OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 0' base.py:977 base.py:978 ************************************************************************* base.py:978 ** WARNING: Unable to update template ** base.py:978 ************************************************************************* base.py:978 base.py:978 Briefcase is unable the update the application template. This base.py:978 may be because your computer is currently offline. Briefcase will base.py:978 use existing template without updating. base.py:978 base.py:978 ************************************************************************* base.py:978 Using existing template (sha 8f153808429f87d7df42baf69db1d1c60fd62a88, updated Tue Jun 11 21:41:21 2024) base.py:996 create.py:887 [helloworld] Installing support package... create.py:887 Using support package https://www.python.org/ftp/python/3.12.1/python-3.12.1-embed-amd64.zip create.py:354 [20:00:07] python-3.12.1-embed-amd64.zip already downloaded file.py:147 Unpacking support package... started create.py:269 [20:00:08] Unpacking support package... done create.py:269 create.py:898 [helloworld] Installing stub binary... create.py:898 Using stub binary https://briefcase-support.s3.amazonaws.com/python/3.12/windows/GUI-Stub-3.12-b5.zip create.py:465 [20:00:10] GUI-Stub-3.12-b5.zip already downloaded file.py:147 Installing stub binary... started create.py:410 Installing stub binary... done create.py:410 create.py:905 [helloworld] Installing application code... create.py:905 Installing src/helloworld... started create.py:685 Installing src/helloworld... done create.py:685 create.py:908 [helloworld] Installing requirements... create.py:908 Installing app requirements... started create.py:622 subprocess.py:827 >>> Running Command: subprocess.py:827 >>> 'C:\Users\Pairman\Downloads\bw\venv\Scripts\python.exe' -u -X utf8 -m pip install --disable-pip-version-check --no-python-version-warning subprocess.py:827 --upgrade --no-user '--target=C:\Users\Pairman\Downloads\bw\helloworld\build\helloworld\windows\app\src\app_packages' aiohttp toga 'toga-winforms~=0.4.5' >>> Working Directory: subprocess.py:827 >>> C:\Users\Pairman\Downloads\bw\helloworld subprocess.py:827 [20:00:14] Collecting aiohttp subprocess.py:195 Using cached aiohttp-3.10.6-cp312-cp312-win_amd64.whl.metadata (7.8 kB) subprocess.py:195 [20:00:15] Collecting toga subprocess.py:195 Using cached toga-0.4.7-py3-none-any.whl.metadata (4.1 kB) subprocess.py:195 Collecting toga-winforms~=0.4.5 subprocess.py:195 Using cached toga_winforms-0.4.7-py3-none-any.whl.metadata (3.2 kB) subprocess.py:195 [20:00:16] Collecting aiohappyeyeballs>=2.3.0 (from aiohttp) subprocess.py:195 Using cached aiohappyeyeballs-2.4.0-py3-none-any.whl.metadata (5.9 kB) subprocess.py:195 Collecting aiosignal>=1.1.2 (from aiohttp) subprocess.py:195 Using cached aiosignal-1.3.1-py3-none-any.whl.metadata (4.0 kB) subprocess.py:195 Collecting attrs>=17.3.0 (from aiohttp) subprocess.py:195 Using cached attrs-24.2.0-py3-none-any.whl.metadata (11 kB) subprocess.py:195 [20:00:17] Collecting frozenlist>=1.1.1 (from aiohttp) subprocess.py:195 Using cached frozenlist-1.4.1-cp312-cp312-win_amd64.whl.metadata (12 kB) subprocess.py:195 [20:00:18] Collecting multidict<7.0,>=4.5 (from aiohttp) subprocess.py:195 Using cached multidict-6.1.0-cp312-cp312-win_amd64.whl.metadata (5.1 kB) subprocess.py:195 [20:00:19] Collecting yarl<2.0,>=1.12.0 (from aiohttp) subprocess.py:195 Using cached yarl-1.12.1-cp312-cp312-win_amd64.whl.metadata (50 kB) subprocess.py:195 Collecting pythonnet>=3.0.0 (from toga-winforms~=0.4.5) subprocess.py:195 Using cached pythonnet-3.0.4-py3-none-any.whl.metadata (6.6 kB) subprocess.py:195 [20:00:20] Collecting toga-core==0.4.7 (from toga-winforms~=0.4.5) subprocess.py:195 Using cached toga_core-0.4.7-py3-none-any.whl.metadata (5.4 kB) subprocess.py:195 Collecting travertino>=0.3.0 (from toga-core==0.4.7->toga-winforms~=0.4.5) subprocess.py:195 Using cached travertino-0.3.0-py3-none-any.whl.metadata (4.3 kB) subprocess.py:195 [20:00:21] Collecting clr-loader<0.3.0,>=0.2.6 (from pythonnet>=3.0.0->toga-winforms~=0.4.5) subprocess.py:195 Using cached clr_loader-0.2.6-py3-none-any.whl.metadata (1.4 kB) subprocess.py:195 Collecting idna>=2.0 (from yarl<2.0,>=1.12.0->aiohttp) subprocess.py:195 Using cached idna-3.10-py3-none-any.whl.metadata (10 kB) subprocess.py:195 [20:00:22] Collecting cffi>=1.13 (from clr-loader<0.3.0,>=0.2.6->pythonnet>=3.0.0->toga-winforms~=0.4.5) subprocess.py:195 Using cached cffi-1.17.1-cp312-cp312-win_amd64.whl.metadata (1.6 kB) subprocess.py:195 Collecting pycparser (from cffi>=1.13->clr-loader<0.3.0,>=0.2.6->pythonnet>=3.0.0->toga-winforms~=0.4.5) subprocess.py:195 Using cached pycparser-2.22-py3-none-any.whl.metadata (943 bytes) subprocess.py:195 Using cached aiohttp-3.10.6-cp312-cp312-win_amd64.whl (378 kB) subprocess.py:195 Using cached toga-0.4.7-py3-none-any.whl (3.3 kB) subprocess.py:195 Using cached toga_winforms-0.4.7-py3-none-any.whl (454 kB) subprocess.py:195 Using cached toga_core-0.4.7-py3-none-any.whl (139 kB) subprocess.py:195 Using cached aiohappyeyeballs-2.4.0-py3-none-any.whl (12 kB) subprocess.py:195 Using cached aiosignal-1.3.1-py3-none-any.whl (7.6 kB) subprocess.py:195 Using cached attrs-24.2.0-py3-none-any.whl (63 kB) subprocess.py:195 Using cached frozenlist-1.4.1-cp312-cp312-win_amd64.whl (50 kB) subprocess.py:195 Using cached multidict-6.1.0-cp312-cp312-win_amd64.whl (28 kB) subprocess.py:195 Using cached pythonnet-3.0.4-py3-none-any.whl (295 kB) subprocess.py:195 Using cached yarl-1.12.1-cp312-cp312-win_amd64.whl (110 kB) subprocess.py:195 Using cached clr_loader-0.2.6-py3-none-any.whl (51 kB) subprocess.py:195 Using cached idna-3.10-py3-none-any.whl (70 kB) subprocess.py:195 [20:00:23] Using cached travertino-0.3.0-py3-none-any.whl (16 kB) subprocess.py:195 Using cached cffi-1.17.1-cp312-cp312-win_amd64.whl (181 kB) subprocess.py:195 Using cached pycparser-2.22-py3-none-any.whl (117 kB) subprocess.py:195 [20:00:24] Installing collected packages: travertino, pycparser, multidict, idna, frozenlist, attrs, aiohappyeyeballs, yarl, toga-core, cffi, aiosignal, subprocess.py:195 clr-loader, aiohttp, pythonnet, toga-winforms, toga [20:00:35] Successfully installed aiohappyeyeballs-2.4.0 aiohttp-3.10.6 aiosignal-1.3.1 attrs-24.2.0 cffi-1.17.1 clr-loader-0.2.6 frozenlist-1.4.1 idna-3.10 subprocess.py:195 multidict-6.1.0 pycparser-2.22 pythonnet-3.0.4 toga-0.4.7 toga-core-0.4.7 toga-winforms-0.4.7 travertino-0.3.0 yarl-1.12.1 [20:00:36] >>> Return code: 0 subprocess.py:827 Installing app requirements... done create.py:622 create.py:911 [helloworld] Installing application resources... create.py:911 create.py:914 [helloworld] Removing unneeded app content... create.py:914 Removing unneeded app bundle content... started create.py:848 Removing directory src\app_packages\__pycache__ create.py:855 Removing directory src\app_packages\aiohappyeyeballs\__pycache__ create.py:855 Removing directory src\app_packages\aiohttp\__pycache__ create.py:855 Removing directory src\app_packages\aiosignal\__pycache__ create.py:855 Removing directory src\app_packages\attr\__pycache__ create.py:855 Removing directory src\app_packages\attrs\__pycache__ create.py:855 Removing directory src\app_packages\cffi\__pycache__ create.py:855 Removing directory src\app_packages\clr_loader\__pycache__ create.py:855 Removing directory src\app_packages\frozenlist\__pycache__ create.py:855 Removing directory src\app_packages\idna\__pycache__ create.py:855 Removing directory src\app_packages\multidict\__pycache__ create.py:855 Removing directory src\app_packages\pycparser\__pycache__ create.py:855 Removing directory src\app_packages\pythonnet\__pycache__ create.py:855 Removing directory src\app_packages\toga\__pycache__ create.py:855 Removing directory src\app_packages\toga_winforms\__pycache__ create.py:855 Removing directory src\app_packages\travertino\__pycache__ create.py:855 Removing directory src\app_packages\yarl\__pycache__ create.py:855 Removing directory src\app_packages\clr_loader\ffi\__pycache__ create.py:855 Removing directory src\app_packages\clr_loader\util\__pycache__ create.py:855 Removing directory src\app_packages\pycparser\ply\__pycache__ create.py:855 Removing directory src\app_packages\toga\constants\__pycache__ create.py:855 Removing directory src\app_packages\toga\hardware\__pycache__ create.py:855 Removing directory src\app_packages\toga\plugins\__pycache__ create.py:855 Removing directory src\app_packages\toga\resources\__pycache__ create.py:855 Removing directory src\app_packages\toga\sources\__pycache__ create.py:855 Removing directory src\app_packages\toga\style\__pycache__ create.py:855 Removing directory src\app_packages\toga\widgets\__pycache__ create.py:855 Removing directory src\app_packages\toga_winforms\hardware\__pycache__ create.py:855 Removing directory src\app_packages\toga_winforms\libs\__pycache__ create.py:855 Removing directory src\app_packages\toga_winforms\widgets\__pycache__ create.py:855 Removing unneeded app bundle content... done create.py:848 create.py:917 [helloworld] Created build\helloworld\windows\app create.py:917 Saving log... started console.py:390 ```

briefcase run -u (stopped with ctrl + c):

``` Date/Time: 2024-09-26 20:10:03 Command line: C:\Users\Pairman\Downloads\bw\venv\Scripts\briefcase run -u --log OS Release: Windows 11 OS Version: 10.0.22631 Architecture: AMD64 Platform: Windows-11-10.0.22631-SP0 Python exe: C:\Users\Pairman\Downloads\bw\venv\Scripts\python.exe Python version: 3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] Virtual env: True Conda env: False Briefcase: 0.3.19 Target platform: windows Target format: app Environment Variables: ALLUSERSPROFILE=C:\ProgramData APPDATA=C:\Users\Pairman\AppData\Roaming ASL.LOG=Destination=file COMMONPROGRAMFILES=C:\Program Files\Common Files COMMONPROGRAMFILES(X86)=C:\Program Files (x86)\Common Files COMMONPROGRAMW6432=C:\Program Files\Common Files COMPUTERNAME=PAIRFACE COMSPEC=C:\Windows\system32\cmd.exe DRIVERDATA=C:\Windows\System32\Drivers\DriverData HOMEDRIVE=C: HOMEPATH=\Users\Pairman LOCALAPPDATA=C:\Users\Pairman\AppData\Local LOGONSERVER=\\PAIRFACE NUMBER_OF_PROCESSORS=8 ONEDRIVE=C:\Users\Pairman\OneDrive OS=Windows_NT PATH=C:\Users\Pairman\Downloads\bw\venv\Scripts;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\WireGuard\;C:\Program Files\nodejs\;C:\Users\Pairman\scoop\shims;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\Scripts\;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\;C:\Users\Pairman\AppData\Local\Microsoft\WindowsApps;C:\Users\Pairman\AppData\Local\Programs\Fiddler;C:\Users\Pairman\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\Pairman\AppData\Local\Programs\platform-tools;C:\Users\Pairman\AppData\Roaming\dragonwell21\bin;C:\Users\Pairman\Downloads\ios-webkit-debug-proxy-1.9.1-win64-bin;C:\Users\Pairman\AppData\Roaming\npm PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.CPL PROCESSOR_ARCHITECTURE=AMD64 PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 140 Stepping 1, GenuineIntel PROCESSOR_LEVEL=6 PROCESSOR_REVISION=8c01 PROGRAMDATA=C:\ProgramData PROGRAMFILES=C:\Program Files PROGRAMFILES(X86)=C:\Program Files (x86) PROGRAMW6432=C:\Program Files PSMODULEPATH=C:\Users\Pairman\Documents\WindowsPowerShell\Modules;C:\Program Files\WindowsPowerShell\Modules;C:\Windows\system32\WindowsPowerShell\v1.0\Modules PUBLIC=C:\Users\Public SESSIONNAME=Console SYSTEMDRIVE=C: SYSTEMROOT=C:\Windows TEMP=C:\Users\Pairman\AppData\Local\Temp TMP=C:\Users\Pairman\AppData\Local\Temp USERDOMAIN=PAIRFACE USERDOMAIN_ROAMINGPROFILE=PAIRFACE USERNAME=Pairman USERPROFILE=C:\Users\Pairman VIRTUAL_ENV=C:\Users\Pairman\Downloads\bw\venv VIRTUAL_ENV_PROMPT=venv WINDIR=C:\Windows WSLENV=WT_SESSION:WT_PROFILE_ID: WT_PROFILE_ID={61c54bbd-c2c6-5271-96e7-009a87ff44bf} WT_SESSION=5ad5d309-16eb-4ce3-8014-e6af6d8d4cb3 _OLD_VIRTUAL_PATH=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\WireGuard\;C:\Program Files\nodejs\;C:\Users\Pairman\scoop\shims;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\Scripts\;C:\Users\Pairman\AppData\Local\Programs\Python\Python312\;C:\Users\Pairman\AppData\Local\Microsoft\WindowsApps;C:\Users\Pairman\AppData\Local\Programs\Fiddler;C:\Users\Pairman\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\Pairman\AppData\Local\Programs\platform-tools;C:\Users\Pairman\AppData\Roaming\dragonwell21\bin;C:\Users\Pairman\Downloads\ios-webkit-debug-proxy-1.9.1-win64-bin;C:\Users\Pairman\AppData\Roaming\npm pyproject.toml: # This project was generated with 0.3.19 using template: https://github.com/beeware/briefcase-template@v0.3.19 [tool.briefcase] project_name = "Hello World" bundle = "com.example" version = "0.0.1" url = "https://example.com/helloworld" license.file = "LICENSE" author = "Jane Developer" author_email = "jane@example.com" [tool.briefcase.app.helloworld] formal_name = "Hello World" description = "Hello World" long_description = "Hello World" sources = ["src/helloworld"] requires = ["aiohttp", "toga"] [tool.briefcase.app.helloworld.windows] requires = ["toga-winforms~=0.4.5"] Briefcase Log: [20:09:55] windows_sdk.py:82 [Windows SDK] Finding Suitable Installation... windows_sdk.py:82 update.py:45 [helloworld] Updating application code... update.py:45 Installing src/helloworld... started create.py:685 Installing src/helloworld... done create.py:685 update.py:74 [helloworld] Removing unneeded app content... update.py:74 Removing unneeded app bundle content... started create.py:848 Removing unneeded app bundle content... done create.py:848 update.py:77 [helloworld] Application updated. update.py:77 app.py:55 [helloworld] Building App... app.py:55 Setting stub app details... started app.py:95 subprocess.py:827 >>> Running Command: subprocess.py:827 >>> 'C:\Users\Pairman\AppData\Local\BeeWare\briefcase\Cache\tools\rcedit-x64.exe' 'src\Hello World.exe' --set-version-string CompanyName 'Jane subprocess.py:827 Developer' --set-version-string FileDescription 'Hello World' --set-version-string FileVersion 0.0.1 --set-version-string InternalName helloworld --set-version-string OriginalFilename 'Hello World.exe' --set-version-string ProductName 'Hello World' --set-version-string ProductVersion 0.0.1 --set-icon icon.ico >>> Working Directory: subprocess.py:827 >>> C:\Users\Pairman\Downloads\bw\helloworld\build\helloworld\windows\app subprocess.py:827 >>> Return code: 0 subprocess.py:827 Setting stub app details... done app.py:95 build.py:80 [helloworld] Built build\helloworld\windows\app\src\Hello World.exe build.py:80 run.py:246 [helloworld] Starting app... run.py:246 subprocess.py:827 >>> Running Command: subprocess.py:827 >>> 'C:\Users\Pairman\Downloads\bw\helloworld\build\helloworld\windows\app\src\Hello World.exe' subprocess.py:827 >>> Working Directory: subprocess.py:827 >>> C:\Users\Pairman subprocess.py:827 [20:09:56] =========================================================================== run.py:171 [20:10:03] Stopping... subprocess.py:761 Saving log... started console.py:390 ```

Additional context

Simplified code to reproduce these bugs:

File hierarchy: ``` LICENSE pyproject.toml src/helloworld/__init__.py src/helloworld/__main__.py ``` ```__init__.py```: ``` from aiohttp.web import Application, Response, run_app from toga import App as TogaApp, Box, MainWindow, Label async def index(req): return Response(text = "OK") def start_server(): app = Application() app.router.add_get("/", index) run_app(app, host = "localhost", port = 5001) class MyApp(TogaApp): def startup(self): self.main_window = MainWindow(title = self.formal_name) self.main_window.content = Box(children = (Label("MyApp"), )) self.main_window.show() ``` ```__main__.py```: ``` from multiprocessing import Process from helloworld import MyApp if __name__ == "__main__": # from time import sleep # Process(target = sleep, args = (120,)).start() from helloworld import start_server Process(target = start_server, daemon = True).start() MyApp().main_loop() ``` ```pyproject.toml```: ``` # This project was generated with 0.3.19 using template: https://github.com/beeware/briefcase-template@v0.3.19 [tool.briefcase] project_name = "Hello World" bundle = "com.example" version = "0.0.1" url = "https://example.com/helloworld" license.file = "LICENSE" author = "Jane Developer" author_email = "jane@example.com" [tool.briefcase.app.helloworld] formal_name = "Hello World" description = "Hello World" long_description = "Hello World" sources = ["src/helloworld"] requires = ["aiohttp", "toga"] [tool.briefcase.app.helloworld.windows] requires = ["toga-winforms~=0.4.5"] ```
mhsmith commented 1 month ago

multiprocessing is mostly unsupported in the current version of Briefcase (https://github.com/beeware/briefcase-windows-VisualStudio-template/issues/8). However, there's probably a way to run your server in a thread instead of a separate process. See these StackOverflow questions for advice:

freakboy3742 commented 1 month ago

Closing on the basis that this is an issue with the support package/template, not Briefcase itself.