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non blocking thread stdout
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| import threading | |
| import subprocess | |
| import logging | |
| import os | |
| import fcntl | |
| logger = logging.getLogger() | |
| logger.setLevel(logging.DEBUG) | |
| ch = logging.StreamHandler() | |
| ch.setFormatter(logging.Formatter("%(name)s - %(threadName)s - %(process)s - %(message)s")) | |
| ch.setLevel(logging.DEBUG) | |
| logger.addHandler(ch) | |
| logger.info("hello") | |
| def run(cmd): | |
| p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, | |
| stderr=subprocess.PIPE) | |
| # start a thread, set stdout async | |
| thread = threading.Thread(target=log_to_worker, args=[p.stdout]) | |
| thread.daemon = True | |
| thread.start() | |
| p.wait() #wait for proc to complete before joining thread | |
| thread.join() | |
| p.stdout.flush() | |
| p.stdout.close() | |
| p.stderr.flush() | |
| p.stderr.close() | |
| def log_to_worker(pipe): | |
| fd = pipe.fileno() | |
| data = None | |
| buffer = "" | |
| while True: | |
| try: | |
| data= os.read(fd, 512) | |
| if len(data[-1]) == 0: | |
| break | |
| except Exception as e: | |
| data = "" | |
| break | |
| l = data.splitlines() | |
| print "first: " + l[0][0] | |
| print "last: " + l[-1][-1] | |
| run("cat /tmp/foo.py") | |
| # http://chase-seibert.github.io/blog/2012/11/16/python-subprocess-asynchronous-read-stdout.html | |
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