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#! /usr/bin/env python
import sys, optparse, skytools
from pgq.setinfo import *
__all__ = ['SetAdmin']
command_usage = """
%prog [options] INI CMD [subcmd args]
commands:
"""
class SetAdmin(skytools.AdminScript):
root_name = None
root_info = None
member_map = {}
set_name = None
extra_objs = []
initial_db_name = 'node_db'
def init_optparse(self, parser = None):
p = skytools.AdminScript.init_optparse(self, parser)
p.set_usage(command_usage.strip())
g = optparse.OptionGroup(p, "actual setadm options")
g.add_option("--connstr", action="store_true",
help = "initial connect string")
g.add_option("--provider",
help = "init: connect string for provider")
p.add_option_group(g)
return p
def reload(self):
skytools.AdminScript.reload(self)
self.set_name = self.cf.get('set_name')
def cmd_init_root(self, args):
if len(args) != 2:
raise Exception('init-root needs 2 args')
self.init_node('root', args[0], args[1])
def cmd_init_branch(self, args):
if len(args) != 2:
raise Exception('init-branch needs 2 args')
self.init_node('branch', args[0], args[1])
def cmd_init_leaf(self, args):
if len(args) != 2:
raise Exception('init-leaf needs 2 args')
self.init_node('leaf', args[0], args[1])
def init_node(self, node_type, node_name, node_location):
provider_loc = self.options.provider
# connect to database
db = self.get_database("new_node", connstr = node_location)
# check if code is installed
self.install_code(db)
# query current status
res = self.exec_query(db, "select * from pgq_set.get_node_info(%s)", [self.set_name])
info = res[0]
if info['node_type'] is not None:
self.log.info("Node is already initialized as %s" % info['node_type'])
return
self.log.info("Initializing node")
# fixme
worker_name = "%s_%s_worker" % (self.set_name, node_name)
# register member
if node_type in ('root', 'combined-root'):
global_watermark = None
combined_set = None
provider_name = None
self.exec_sql(db, "select pgq_set.add_member(%s, %s, %s, false)",
[self.set_name, node_name, node_location])
self.exec_sql(db, "select pgq_set.create_node(%s, %s, %s, %s, %s, %s, %s)",
[self.set_name, node_type, node_name, worker_name, provider_name, global_watermark, combined_set])
provider_db = None
else:
root_db = self.find_root_db(provider_loc)
set = self.load_root_info(root_db)
# check if member already exists
if set.get_member(node_name) is not None:
self.log.error("Node '%s' already exists" % node_name)
sys.exit(1)
global_watermark = set.global_watermark
combined_set = None
provider_db = self.get_database('provider_db', connstr = provider_loc)
curs = provider_db.cursor()
curs.execute("select node_type, node_name from pgq_set.get_node_info(%s)", [self.set_name])
provider_db.commit()
row = curs.fetchone()
if not row:
raise Exception("provider node not found")
provider_name = row['node_name']
# register member on root
self.exec_sql(root_db, "select pgq_set.add_member(%s, %s, %s, false)",
[self.set_name, node_name, node_location])
root_db.commit()
# lookup provider
provider = set.get_member(provider_name)
if not provider:
self.log.error("Node %s does not exist" % provider_name)
sys.exit(1)
# register on provider
self.exec_sql(provider_db, "select pgq_set.add_member(%s, %s, %s, false)",
[self.set_name, node_name, node_location])
self.exec_sql(provider_db, "select pgq_set.subscribe_node(%s, %s, %s)",
[self.set_name, node_name, worker_name])
provider_db.commit()
# initialize node itself
self.exec_sql(db, "select pgq_set.add_member(%s, %s, %s, false)",
[self.set_name, node_name, node_location])
self.exec_sql(db, "select pgq_set.add_member(%s, %s, %s, false)",
[self.set_name, provider_name, provider.location])
self.exec_sql(db, "select pgq_set.create_node(%s, %s, %s, %s, %s, %s, %s)",
[self.set_name, node_type, node_name, worker_name, provider_name,
global_watermark, combined_set])
db.commit()
self.extra_init(node_type, db, provider_db)
self.log.info("Done")
def extra_init(self, node_type, node_db, provider_db):
pass
def find_root_db(self, initial_loc = None):
if initial_loc:
loc = initial_loc
else:
loc = self.cf.get(self.initial_db_name)
while 1:
db = self.get_database('root_db', connstr = loc)
if 1:
curs = db.cursor()
curs.execute("select current_database()")
n = curs.fetchone()[0]
self.log.debug("real dbname=%s" % n)
# query current status
res = self.exec_query(db, "select * from pgq_set.get_node_info(%s)", [self.set_name])
info = res[0]
type = info['node_type']
if type is None:
self.log.info("Root node not initialized?")
sys.exit(1)
self.log.debug("db='%s' -- type='%s' provider='%s'" % (loc, type, info['provider_location']))
# configured db may not be root anymore, walk upwards then
if type in ('root', 'combined-root'):
db.commit()
return db
self.close_database('root_db')
if loc == info['provider_location']:
raise Exception("find_root_db: got loop: %s" % loc)
loc = info['provider_location']
if loc is None:
self.log.info("Sub node provider not initialized?")
sys.exit(1)
def load_root_info(self, db):
res = self.exec_query(db, "select * from pgq_set.get_node_info(%s)", [self.set_name])
info = res[0]
q = "select * from pgq_set.get_member_info(%s)"
node_list = self.exec_query(db, q, [self.set_name])
db.commit()
return SetInfo(self.set_name, info, node_list)
def install_code(self, db):
objs = [
skytools.DBLanguage("plpgsql"),
skytools.DBFunction("txid_current_snapshot", 0, sql_file="txid.sql"),
skytools.DBSchema("pgq", sql_file="pgq.sql"),
skytools.DBSchema("pgq_ext", sql_file="pgq_ext.sql"),
skytools.DBSchema("pgq_set", sql_file="pgq_set.sql"),
]
objs += self.extra_objs
skytools.db_install(db.cursor(), objs, self.log)
db.commit()
def cmd_status(self, args):
root_db = self.find_root_db()
sinf = self.load_root_info(root_db)
for mname, minf in sinf.member_map.iteritems():
db = self.get_database('look_db', connstr = minf.location, autocommit = 1)
curs = db.cursor()
curs.execute("select * from pgq_set.get_node_info(%s)", [self.set_name])
node = NodeInfo(curs.fetchone())
sinf.add_node(node)
self.close_database('look_db')
sinf.print_tree()
def cmd_switch(self):
[['node', 'PAUSE']]
[['new_parent', 'select * from pgq_set.subscribe_node(%(set_name)s, %(node_name)s, %(node_pos)s)']]
[['node', 'select * from pgq_set.change_provider(%(set_name)s, %(new_provider)s)']]
[['old_parent', 'select * from pgq_set.unsubscribe_node(%(set_name)s, %(node_name)s, %(node_pos)s)']]
[['node', 'RESUME']]
def cmd_promote(self):
[['old-root', 'PAUSE']]
[['old-root', 'demote, set-provider?']]
[['new-root', 'wait-for-catch-up']]
[['new-root', 'pause']]
[['new-root', 'promote']]
[['new-root', 'resume']]
[['old-root', 'resume']]
[['new_parent', 'select * from pgq_set.subscribe_node(%(set_name)s, %(node_name)s, %(node_pos)s)']]
[['node', 'select * from pgq_set.change_provider(%(set_name)s, %(new_provider)s)']]
[['old_parent', 'select * from pgq_set.unsubscribe_node(%(set_name)s, %(node_name)s, %(node_pos)s)']]
[['node', 'RESUME']]
def subscribe_node(self, target_node, subscriber_node, tick_pos):
q = "select * from pgq_set.subscribe_node(%s, %s, %s)"
self.node_exec(target_node, q, [self.set_name, target_node, tick_pos])
def unsubscribe_node(self, target_node, subscriber_node, tick_pos):
q = "select * from pgq_set.subscribe_node(%s, %s, %s)"
self.node_exec(target_node, q, [self.set_name, target_node, tick_pos])
def node_cmd(self, node_name, sql, args, commit = True):
m = self.lookup_member(node_name)
db = self.get_database('node_'+node_name)
self.db_cmd(db, sql, args, commit = commit)
def connect_node(self, node_name):
sinf = self.get_set_info()
m = sinf.get_member(node_name)
loc = m.node_location
db = self.get_database("node." + node_name, connstr = loc)
def disconnect_node(self, node_name):
self.close_database("node." + node_name)
if __name__ == '__main__':
script = SetAdmin('set_admin', sys.argv[1:])
script.start()
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