簡單 TCP 路由代理：tproxy

tproxy 是簡單 TCP 路由代理 (layer 7)  ，基于 Gevent，可以使用 Python 配置路線邏輯。tproxy 靈感來源于 proxy machine，但是有一些獨特的特性，比如 Gunicorn 的預先 fork 人工模式。

使用：

$ tproxy -h
Usage: tproxy [OPTIONS] script_path
Options:
  --version                     show program's version number and exit
  -h, --help                    show this help message and exit
  --log-file=FILE               The log file to write to. [-]
  --log-level=LEVEL             The granularity of log outputs. [info]
  --log-config=FILE             The log config file to use. [None]
  -n STRING, --name=STRING      A base to use with setproctitle for process naming.
                                [None]
  -D, --daemon                  Daemonize the tproxy process. [False]
  -p FILE, --pid=FILE           A filename to use for the PID file. [None]
  -u USER, --user=USER          Switch worker processes to run as this user. [501]
  -g GROUP, --group=GROUP
                                Switch worker process to run as this group. [20]
  -m INT, --umask=INT           A bit mask for the file mode on files written by
                                tproxy. [0]
  -b ADDRESS, --bind=ADDRESS    The socket to bind. [127.0.0.1:8000]
  --backlog=INT                 The maximum number of pending connections.     [2048]
  --ssl-keyfile=STRING          Ssl key file [None]
  --ssl-certfile=STRING         Ssl ca certs file. contains concatenated
                                "certification [None]
  --ssl-ca-certs=STRING         Ssl ca certs file. contains concatenated
                                "certification [None]
  --ssl-cert-reqs=INT           Specifies whether a certificate is required from the
                                other [0]
  -w INT, --workers=INT         The number of worker process for handling requests. [1]
  --worker-connections=INT      The maximum number of simultaneous clients per worker.
                                [1000]
  -t INT, --timeout=INT         Workers silent for more than this many seconds are
                                killed and restarted. [30]

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