--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/logger.py	Sun Jul 30 09:31:46 2017 +0000
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+import json
+import logging
+from datetime import datetime
+from os import makedirs
+from os.path import abspath, dirname, join
+
+from tornado.ioloop import IOLoop
+from tornado.options import define, options
+from tornado.web import Application, HTTPError, RequestHandler
+
+
+class LogHandler(RequestHandler):
+    def post(self):
+        try:
+            data = json.loads(self.request.body.decode('utf-8'))
+        except ValueError:
+            raise HTTPError(400, 'Malformed JSON')
+        self.log(data)
+
+    def log(self, data):
+        logdir = abspath(join(dirname(__file__), 'log'))
+        makedirs(logdir, exist_ok=True)
+        time = datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S.%fZ')
+        fn = join(logdir, time + '.json')
+        with open(fn, 'w') as f:
+            json.dump(data, f, ensure_ascii=False, indent=4, sort_keys=True)
+
+
+class Logger(Application):
+    def __init__(self, debug=False):
+        handlers = [
+            (r'.*', LogHandler)
+        ]
+        super().__init__(handlers, debug=debug)
+
+    def listen(self, port, address='', **kwargs):
+        name = self.__class__.__name__
+        logging.info('%s is serving on http://%s:%d/', name, address, port)
+        super().listen(port, address, **kwargs)
+
+
+def main():
+    define('listen', metavar='IP', default='127.0.0.1')
+    define('port', metavar='PORT', default=8111, type=int)
+    define('xheaders', metavar='True|False', default=False, type=bool)
+    define('debug', metavar='True|False', default=False, type=bool)
+
+    options.parse_command_line()
+
+    application = Logger(options.debug)
+    application.listen(options.port, options.listen, xheaders=options.xheaders)
+
+    IOLoop.current().start()
+
+
+if __name__ == '__main__':
+    main()