import sys from datetime import datetime from threading import Thread import Queue from boto.utils import RequestHook from boto.compat import long_type class RequestLogger(RequestHook): """ This class implements a request logger that uses a single thread to write to a log file. """ def __init__(self, filename='/tmp/request_log.csv'): self.request_log_file = open(filename, 'w') self.request_log_queue = Queue.Queue(100) Thread(target=self._request_log_worker).start() def handle_request_data(self, request, response, error=False): len = 0 if error else response.getheader('Content-Length') now = datetime.now() time = now.strftime('%Y-%m-%d %H:%M:%S') td = (now - request.start_time) duration = (td.microseconds + long_type(td.seconds + td.days * 24 * 3600) * 1e6) / 1e6 # write output including timestamp, status code, response time, response size, request action self.request_log_queue.put("'%s', '%s', '%s', '%s', '%s'\n" % (time, response.status, duration, len, request.params['Action'])) def _request_log_worker(self): while True: try: item = self.request_log_queue.get(True) self.request_log_file.write(item) self.request_log_file.flush() self.request_log_queue.task_done() except: import traceback traceback.print_exc(file=sys.stdout)