fix: Remove psutil dependency

[hpohekar]

closes #3423

1. Remove psutil dependency
2. Implemented _pid_exists in replacement of psutil.pid_exists()

[mkundu1]

@hpohekar I've also tested this approach. Does it work in Windows?

[hpohekar]

@hpohekar I've also tested this approach. Does it work in Windows?

@mkundu1 Right, it was not working in Windows but we have got 2 solutions, both of them are working fine.

Personally I think 1st is better.

Solution 1:

elif platform.system() == "Windows":
        process_query_information = 0x1000
        process_handle = ctypes.windll.kernel32.OpenProcess(
            process_query_information, 0, pid
        )
        if process_handle == 0:
            return False
        else:
            ctypes.windll.kernel32.CloseHandle(process_handle)
            return True

Solution 2:

elif platform.system() == "Windows":
	try:
		command = f'tasklist /FI "PID eq {pid}"'
		result = subprocess.run(command, shell=True, text=True, capture_output=True)
		if result.returncode == 0:
			output = result.stdout.strip()
			lines = output.splitlines()
			if len(lines) == 3 and str(pid) in lines[2]:
				return True
			else:
				return False
	except Exception as e:
		return False

I have checked it locally, tests are passing in Windows now. We have also added a separate test for standalone mode.

[mkundu1]

@hpohekar I've also tested this approach. Does it work in Windows?

@mkundu1 Right, it was not working in Windows but we have got 2 solutions, both of them are working fine.

Personally I think 1st is better.

Solution 1:

elif platform.system() == "Windows":
        process_query_information = 0x1000
        process_handle = ctypes.windll.kernel32.OpenProcess(
            process_query_information, 0, pid
        )
        if process_handle == 0:
            return False
        else:
            ctypes.windll.kernel32.CloseHandle(process_handle)
            return True

Solution 2:

elif platform.system() == "Windows":
	try:
		command = f'tasklist /FI "PID eq {pid}"'
		result = subprocess.run(command, shell=True, text=True, capture_output=True)
		if result.returncode == 0:
			output = result.stdout.strip()
			lines = output.splitlines()
			if len(lines) == 3 and str(pid) in lines[2]:
				return True
			else:
				return False
	except Exception as e:
		return False

I have checked it locally, tests are passing in Windows now. We have also added a separate test for standalone mode.

Tested it, looks fine. Thanks.

[mkundu1]

@hpohekar watchdog_exec also uses psutil.

[hpohekar]

@hpohekar watchdog_exec also uses psutil.

@mkundu1 Yes. Thank you.