Python plugin: Flow Launcher hangs on stream output larger than buffer

[Garulf]

Describe the bug/issue
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Any python plugin that returns more then 5 results causes FLow Launcher to never return results
2. Flow Launcher stays in infinite loading state

Your System

Windows build number: Microsoft Windows [Version 10.0.22000.100]
Flow Launcher version: 1.8.0

Flow Launcher Error Log
No error is ever logged

[taooceros]

Could you provide a sample python plugin for us to test?

[Garulf]

I'm working on a simple example now.

[taooceros]

I create a python plugin with 6 results, and it works fine.🤔

[Garulf]

# -*- coding: utf-8 -*-
import os.path
import json



from flowlauncher import FlowLauncher
from flowlauncher import FlowLauncherAPI as API


class Test(FlowLauncher):
       
    def add_item(self, title, subtitle='', icon=None, method=None, parameters=None, context=None, hide=False):

        item = {
            "Title": title,
            "SubTitle": subtitle,
            "IcoPath": icon,
            "ContextData": context,
            "JsonRPCAction": {}
        }    
        self.results.append(item)


    def query(self, query):
        self.results = []
        for _ in range(50):
            
            self.add_item(
                title=str(_),
                subtitle=query
            )

        return self.results


if __name__ == "__main__":
    Test()

it just hanges for no reason. I think the json is getting cut off

[Garulf]

I create a python plugin with 6 results, and it works fine.🤔

Yeah my sample works with 6+ but hangs on 50

[taooceros]

I see. Interesting. 49 works fine, but 50 will cause the issue. Will investigate now.

[taooceros]

I found the issue. Probably because the buffer exceed, so the process hang when waiting Flow to read the data.

[taooceros]

Hmmm to fix this may require a larger refactor. I will handle it recently, but probably not able to finish it up today.

[Garulf]

I found the issue. Probably because the buffer exceed, so the process hang when waiting Flow to read the data.

Sounds like that is the issue. On very large json it only took 5+ items to cause this behavior.