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#!/usr/bin/env python3
'''
_/ _/ _/
_/_/ _/ _/_/ _/_/_/ _/_/ _/_/ _/_/_/ _/_/_/
_/ _/ _/ _/_/_/_/ _/ _/ _/ _/_/_/_/ _/_/ _/ _/_/
_/ _/_/ _/ _/ _/ _/ _/ _/_/ _/ _/_/
_/ _/ _/_/_/ _/ _/ _/ _/_/_/ _/_/_/ _/ _/_/_/
Copyright 2025 bdunahu
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Commentary:
Code:
'''
import argparse
import os
import signal
import subprocess
import sys
import threading
import time
from _remote_debugging import RemoteUnwinder
import json
class Nemesis(object):
# the process id of the target program
pid = 0
# the (ideal) interval between samples
signal_interval = 0.0
# the timestamp which the last sample was taken
last_sample = None
@staticmethod
def __init__(pid, signal_interval=0.01):
Nemesis.pid = pid
Nemesis.signal_interval = signal_interval
@staticmethod
def start():
Nemesis.last_sample = time.perf_counter()
signal.signal(signal.SIGALRM,
Nemesis._signal_handler)
signal.setitimer(signal.ITIMER_REAL,
Nemesis.signal_interval,
Nemesis.signal_interval)
@staticmethod
def stop():
signal.setitimer(signal.ITIMER_REAL, 0)
@staticmethod
def _signal_handler(sig, frame):
sample = Nemesis._get_all_awaited_by()
Nemesis._tally_coroutines(sample)
@staticmethod
def _format_stack_entry(elem: str|FrameInfo) -> str:
if not isinstance(elem, str):
if elem.lineno == 0 and elem.filename == "":
return f"{elem.funcname}"
else:
return f"{elem.funcname} {elem.filename}:{elem.lineno}"
return elem
@staticmethod
def _index(result):
id2name, awaits, task_stacks = {}, [], {}
for awaited_info in result:
for task_info in awaited_info.awaited_by:
task_id = task_info.task_id
task_name = task_info.task_name
id2name[task_id] = task_name
# Store the internal coroutine stack for this task
if task_info.coroutine_stack:
for coro_info in task_info.coroutine_stack:
call_stack = coro_info.call_stack
internal_stack = [Nemesis._format_stack_entry(frame) for frame in call_stack]
task_stacks[task_id] = internal_stack
# Add the awaited_by relationships (external dependencies)
if task_info.awaited_by:
for coro_info in task_info.awaited_by:
call_stack = coro_info.call_stack
parent_task_id = coro_info.task_name
stack = [Nemesis._format_stack_entry(frame) for frame in call_stack]
awaits.append((parent_task_id, stack, task_id))
return id2name, awaits, task_stacks
@staticmethod
def _get_all_awaited_by():
unwinder = RemoteUnwinder(Nemesis.pid)
return unwinder.get_all_awaited_by()
def _tally_coroutines(sample):
id2name, awaits, task_stacks = Nemesis._index(sample)
print(id2name)
print(awaits)
print(task_stacks)
print('--')
# for tid, tasks in sample:
# print('---')
# print(f'tid: {tid}')
# for awaited_info in sample:
# for task_info in awaited_info.awaited_by:
# print(f' task_id: {task_info.task_id}')
# print(f' name: {task_info.task_name}')
# if task_info.coroutine_stack:
# print(f' stack:')
# for coro_info in task_info.coroutine_stack:
# print(f' {coro_info.call_stack}')
# if task_info.awaited_by:
# print(f' parents:')
# for coro_info in task_info.awaited_by:
# print(f' {coro_info.task_name}')
# print(f' {coro_info.call_stack}')
# print(f'')
if __name__ == "__main__":
def run_process(script_path, script_args):
if not os.path.isfile(script_path):
print(f"Script {script_path} does not exist.")
sys.exit(1)
try:
process = subprocess.Popen(['python3', script_path] + script_args)
print(f"Executed: {script_path} with {script_args} (pid {process.pid})")
return process.pid
except Exception as e:
print(f"Error starting script: {e}")
sys.exit(1)
parser = argparse.ArgumentParser(
usage="%(prog)s [args] -- script [args]"
)
parser.add_argument("-i", "--interval",
help="The minimum amount of time inbetween samples in seconds.",
metavar="",
type=float,
default=0.01)
parser.add_argument("-t", "--total-time",
help="The total amount of time to monitor the target process.",
metavar="",
type=float,
default=10)
parser.add_argument("-p", "--pid",
help="The pid of the target python process.",
metavar="",
type=int)
parser.add_argument("prog",
type=str,
nargs='*',
help="Path to the python script to run and its arguments.")
args = parser.parse_args()
if args.prog:
pid = run_process(args.prog[0], args.prog[1:])
# wait for process to start
time.sleep(0.5)
elif args.pid is not None:
pid = args.pid
else:
print("No valid arguments provided. Use -p for PID or -- followed by the script path.")
sys.exit(1)
Nemesis(pid, args.interval).start()
# stop the profiler after args.total_time
threading.Timer(args.total_time, Nemesis.stop).start()
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