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September 3, 2024 04:38
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python async subprocess example module with stdout and stderr support
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| #!/usr/bin/env python3 | |
| import collections | |
| import asyncio | |
| import sys | |
| class AsyncSubProcess: | |
| def __init__(self, program, *args, env={}, output=True, cwd=None): | |
| self.proc = None | |
| self.program = program | |
| self.args = args | |
| self.env = env | |
| self.cwd = cwd | |
| self.callback_stdout = output and (lambda x: print(x, end="")) | |
| self.callback_stderr = output and (lambda x: print(x, end="", file=sys.stderr)) | |
| self.tasks = {} | |
| async def exec(self): | |
| self.proc = await asyncio.create_subprocess_exec( | |
| self.program, | |
| *self.args, | |
| stdout=asyncio.subprocess.PIPE, | |
| stderr=asyncio.subprocess.PIPE, | |
| env=self.env, | |
| cwd=self.cwd | |
| ) | |
| @staticmethod | |
| async def read_stream(stream, callback=None): | |
| output = collections.deque(maxlen=50000) | |
| while not stream.at_eof(): | |
| line = await stream.readline() | |
| output.append(line.decode("UTF-8")) | |
| if line and callback: | |
| callback(output[-1]) | |
| return output | |
| def create_tasks(self): | |
| self.tasks["stdout"] = asyncio.create_task( | |
| self.read_stream(self.proc.stdout, self.callback_stdout) | |
| ) | |
| self.tasks["stderr"] = asyncio.create_task( | |
| self.read_stream(self.proc.stderr, self.callback_stderr) | |
| ) | |
| async def wait(self): | |
| self.create_tasks() | |
| await asyncio.wait(self.tasks.values()) | |
| return ( | |
| self.proc.returncode, | |
| "".join(self.tasks["stdout"].result()), | |
| "".join(self.tasks["stderr"].result()), | |
| ) | |
| @classmethod | |
| async def main(self, *cmd, **kw): | |
| runner = self(*cmd, **kw) | |
| await runner.exec() | |
| return await runner.wait() | |
| def run(*cmd, **kw): | |
| return asyncio.run(AsyncSubProcess.main(*cmd, **kw)) |
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