Not able to attach debugger to a java gradle process

[shubham-dogra-s1]

I am using pre_debug_task to start a gradle process and want to attach debugger to this. But from logs it looks like it is waiting for pre-debug-task to be completed.

configuration

{
	"folders":
	[
		{
			"path": ".",
		}
	],
	"debugger_configurations":
	[	
		{
			"type": "java",
			"name": "Debug Gateway",
			"request": "attach",
			"hostName": "localhost",
            "port": 5005,
            "mainClass": "com.shubham.dogra.Gateway",
    		"projectName": "gateway",
            "pre_debug_task": "run_gateway"
		},
	],
	"debugger_tasks": 
	[	
		{
			"name" : "run_gateway",
			"shell_cmd": "./gradlew bootRun -p gateway --debug-jvm",
        	"working_dir": "${folder}",
      		"file_regex": "^.*Listening for transport dt_socket at address: 5005.*$",
		}
	]
}

From logs it looks like debugger is waiting for pre_debug_task to be completed and then it will run the attach process. Is there any way we can attach degugger right way when pre_debug_task is running without errors?

[shubham-dogra-s1]

I can see from code if we add background key, it won't wait for pre-debug task to be completed
https://github.com/daveleroy/SublimeDebugger/blob/master/modules/tasks.py#L33

instead of not waiting for pre-debug-task when background: true, can we something like this if background is true then wait for anything that matches the regex given by user as input maybe Server is ready / started , with a timeout given by user

[shubham-dogra-s1]

# Case for background task
        if t.task.background:
            timeout_seconds = 60 # Set your desired timeout
            regex_pattern = r"Your user-defined regex here" # Replace with user input
            
            try:
                # Use asyncio.wait_for with a timeout
                await asyncio.wait_for(
                    t.task.wait_for_regex(regex_pattern),
                    timeout=timeout_seconds
                )
                debugger.console.info(f"Regex pattern '{regex_pattern}' found in task output.")
            except asyncio.TimeoutError:
                debugger.console.info(f"Timeout of {timeout_seconds} seconds reached. Regex pattern not found.")
            except Exception as e:
                debugger.console.error(f"An error occurred: {e}")
            return

[daveleroy]

This implementation seems a little specific to your use case. If you want to try implementing something I think it should try to be more generally useful.

The tasks implementation is trying to loosely mimic what vscode supports so looking at what they implemented is a good place to start.

I believe in vscode land background tasks have an active state. Debugging will wait to start if the preDebugTask is in the active state. Thus if you set the task to active at the start and add an ends regex you could accomplish what you are after in vscode.

See https://code.visualstudio.com/docs/debugtest/tasks#_background-watching-tasks

"background": {
    "activeOnStart": true,
    "beginsPattern": "^\\s*\\d{1,2}:\\d{1,2}:\\d{1,2}(?: AM| PM)? - File change detected\\. Starting incremental compilation\\.\\.\\.",
    "endsPattern": "^\\s*\\d{1,2}:\\d{1,2}:\\d{1,2}(?: AM| PM)? - Compilation complete\\. Watching for file changes\\."
}

[shubham-dogra-s1]

yeah write now the functionality is not complete in this package where i want to start a process in pre build task and attach a debugger to the process on it as soon as process in ready to accept connections

in current implementation

• debugger will wait for pre-debug_task completetion which will never happen as process in running
• debugger won't wait at all and give not able to connect error if we use background: true

[shubham-dogra-s1]

raised a pr for this https://github.com/daveleroy/SublimeDebugger/pull/302/files