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#! /usr/bin/env python
"""PgQ ticker and maintenance.
Config template::
[pgqadm]
# should be globally unique
job_name = pgqadm_somedb
db = dbname=provider port=6000 host=127.0.0.1
# how often to run maintenance [minutes]
maint_delay_min = 5
# how often to check for activity [secs]
loop_delay = 0.5
logfile = ~/log/%(job_name)s.log
pidfile = ~/pid/%(job_name)s.pid
use_skylog = 0
"""
import sys
import pkgloader
pkgloader.require('skytools', '3.0')
import skytools, pgq
from pgq.cascade.admin import CascadeAdmin
"""TODO:
pgqadm ini check
"""
command_usage = """
%prog [options] INI CMD [subcmd args]
local queue commands:
ticker start ticking & maintenance process
status show overview of queue health
install install code into db
create QNAME create queue
drop QNAME drop queue
register QNAME CONS install code into db
unregister QNAME CONS install code into db
config QNAME [VAR=VAL] show or change queue config
cascaded queue commands:
create-node
rename-node
pause-node
resume-node
change-provider
tag-alive
tag-dead
switchover
failover
"""
config_allowed_list = {
'queue_ticker_max_count': 'int',
'queue_ticker_max_lag': 'interval',
'queue_ticker_idle_period': 'interval',
'queue_rotation_period': 'interval',
}
class PGQAdmin(skytools.DBScript):
__doc__ = __doc__
def __init__(self, args):
"""Initialize pgqadm."""
skytools.DBScript.__init__(self, 'pgqadm', args)
self.set_single_loop(1)
if len(self.args) < 2:
print("need command")
sys.exit(1)
int_cmds = {
'create': self.create_queue,
'drop': self.drop_queue,
'register': self.register,
'unregister': self.unregister,
'install': self.installer,
'config': self.change_config,
}
cascade_cmds = ['create-node']
cmd = self.args[1]
if cmd == "ticker":
script = pgq.SmallTicker(args)
elif cmd == "status":
script = pgq.PGQStatus(args)
elif cmd in cascade_cmds:
script = CascadeAdmin(self.service_name, 'db', args)
elif cmd in int_cmds:
script = None
self.work = int_cmds[cmd]
else:
print("unknown command")
sys.exit(1)
if self.pidfile:
self.pidfile += ".admin"
self.run_script = script
def start(self):
if self.run_script:
self.run_script.start()
else:
skytools.DBScript.start(self)
def reload(self):
skytools.DBScript.reload(self)
self.set_single_loop(1)
def init_optparse(self, parser=None):
p = skytools.DBScript.init_optparse(self, parser)
p.set_usage(command_usage.strip())
p.add_option("--queue", help = 'cascading: specify queue name')
return p
def installer(self):
objs = [
skytools.DBLanguage("plpgsql"),
#skytools.DBFunction("txid_current_snapshot", 0, sql_file="txid.sql"),
skytools.DBSchema("pgq", sql_file="pgq.sql"),
]
db = self.get_database('db')
curs = db.cursor()
skytools.db_install(curs, objs, self.log)
db.commit()
def create_queue(self):
qname = self.args[2]
self.log.info('Creating queue: %s' % qname)
self.exec_sql("select pgq.create_queue(%s)", [qname])
def drop_queue(self):
qname = self.args[2]
self.log.info('Dropping queue: %s' % qname)
self.exec_sql("select pgq.drop_queue(%s)", [qname])
def register(self):
qname = self.args[2]
cons = self.args[3]
self.log.info('Registering consumer %s on queue %s' % (cons, qname))
self.exec_sql("select pgq.register_consumer(%s, %s)", [qname, cons])
def unregister(self):
qname = self.args[2]
cons = self.args[3]
self.log.info('Unregistering consumer %s from queue %s' % (cons, qname))
self.exec_sql("select pgq.unregister_consumer(%s, %s)", [qname, cons])
def change_config(self):
if len(self.args) < 3:
qlist = self.get_queue_list()
for qname in qlist:
self.show_config(qname)
return
qname = self.args[2]
if len(self.args) == 3:
self.show_config(qname)
return
alist = []
for el in self.args[3:]:
k, v = el.split('=')
if k not in config_allowed_list:
qk = "queue_" + k
if qk not in config_allowed_list:
raise Exception('unknown config var: '+k)
k = qk
expr = "%s=%s" % (k, skytools.quote_literal(v))
alist.append(expr)
self.log.info('Change queue %s config to: %s' % (qname, ", ".join(alist)))
sql = "update pgq.queue set %s where queue_name = %s" % (
", ".join(alist), skytools.quote_literal(qname))
self.exec_sql(sql, [])
def exec_sql(self, q, args):
self.log.debug(q)
db = self.get_database('db')
curs = db.cursor()
curs.execute(q, args)
db.commit()
def show_config(self, qname):
fields = []
for f, kind in config_allowed_list.items():
if kind == 'interval':
sql = "extract('epoch' from %s)::text as %s" % (f, f)
fields.append(sql)
else:
fields.append(f)
klist = ", ".join(fields)
q = "select " + klist + " from pgq.queue where queue_name = %s"
db = self.get_database('db')
curs = db.cursor()
curs.execute(q, [qname])
res = curs.dictfetchone()
db.commit()
if res is None:
print("no such queue: " + qname)
return
print(qname)
for k in config_allowed_list:
n = k
if k[:6] == "queue_":
n = k[6:]
print(" %s\t=%7s" % (n, res[k]))
def get_queue_list(self):
db = self.get_database('db')
curs = db.cursor()
curs.execute("select queue_name from pgq.queue order by 1")
rows = curs.fetchall()
db.commit()
qlist = []
for r in rows:
qlist.append(r[0])
return qlist
if __name__ == '__main__':
script = PGQAdmin(sys.argv[1:])
script.start()
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