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 .----.|  |--..-----..--.--.
 |  __||  _  ||  _  ||_   _|
 |____||_____||   __||__.__|  connection buffering proxy
------------- |__| ----------------------------------------

This is experimental software. Make sure you know what you're doing before using it for anything else than testing it.

cbpx allows you to switch application (clients) between two backends, but only when all connections to previously active backend have been closed.

• Python >=2.6 <3.0

• -p PORT, --port=PORT - port that proxy will listen on
• -a ACTIVE, --active=ACTIVE - IP:port pair of active backend (the one we switch from)
• -s STANDBY, --standby=STANDBY - IP:port pair of standby backend (the one we switch to)
• -r RC_PORT, --rc_port=RC_PORT - port for remote control connections (remote control is disabled if not specified)
• -t SWITCH_MAX_TIME, --switch_max_time=SWITCH_MAX_TIME - timeout (in seconds) after which switchover fails
• -c MAX_QUEUED_CONNS, --max_queued_conns=MAX_QUEUED_CONNS - queued connections limit, after which switchover fails
• -o MAX_OPEN_CONNS, --max_open_conns=MAX_OPEN_CONNS - open connections limit (used for throttling, 0 disables this feature)
• -b LISTEN_BACKLOG, --listen_backlog=LISTEN_BACKLOG - backlog for listen()
• -n NET_BUFFER_SIZE, --net_buffer_size=NET_BUFFER_SIZE - network communication buffer size
• -w SWITCH_LOOP_WAIT, --switch_loop_wait=SWITCH_LOOP_WAIT - wait in switch loop
• -f LOG_FILE, --log_file=LOG_FILE - log file name
• -l LOG_LEVEL, --log_level=LOG_LEVEL - log level: DEBUG, INFO, WARNING, ERROR
• -x SWITCH_SCRIPT, --switch_script=SWITCH_SCRIPT - script to execute before switch completion (optional)

• hello - Server greeting (for checking proxy availability in remote control mode)
• help - Print help
• quit - Quit proxy (use 'force' parameter to close all active and ignore queued connections)
• set - Show/set variables (set PARAMETER VALUE)
• stats - Print current statistics (stats [SLEEP] [COUNT])
• switch - Perform the switch
• threads - List alive threads