pyPCP

Python library for Pgpool-II Communication Protocol(PCP).

pyPCP provides a interface for administrators to perform management operation, such as getting Pgpool-II status or terminating Pgpool-II processes remotely.

Pgpool-II installation is not required on local machine

Installing

Install and Update using pip.

$ pip install pypcp

Example Usage

from pypcp import PCP, ResultStateType

pcp = PCP()
pcp.pcp_connect('remote_ip', 9898, 'postgres', 'secret')
result = pcp.pcp_node_count()
if result and pcp.PCPResultStatus(result) == ResultStateType.COMMAND_OK:
     print('Node Count  : ', result.pcp_get_data(0))
pcp.pcp_disconnect()

$ Node Count  : 2

JSON Support

You can also get results for each command in JSON format.

print(result.pcp_get_json_data(0))

$ {'command_status': 'success', 'node_count': 2}

Supported Commands

Following commands are supported by pyPCP. Details about each command can be found at PCP Commands

• pcp_proc_count
• pcp_proc_info
• pcp_attach_node
• pcp_detach_node
• pcp_stop_pgpool
• pcp_pool_status
• pcp_node_count
• pcp_watchdog_info
• pcp_node_info
• pcp_stop_pgpool
• pcp_promote_node
• pcp_recovery_node
• pcp_health_check_stats
• pcp_reload_config
• pcp_set_backend_parameter

PCP_CLI

Based on pyPCP library, a cli utility is also available with name pcp_cli pcp_cli provide functionality of all pcp_* utilities provided with Pgpool-II in a single app. Multiple commands are available with there respective sub-commands/groups.

Following example show 'pcp_cli node count':

$ pcp_cli node count -U postgres -H pgpool_host -v
Password:
Node Count
____________
2

List of pcp_cli commands & sub-commands:

• pool status
• pool stop
• pool reload-config
• pool check-health-stats
• node count
• node info
• node attach
• node detach
• node promote
• node recovery
• process count
• process info
• watchdog info