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#! /usr/bin/env python
import sys, optparse, skytools
from pgq.setconsumer import MemberInfo, NodeInfo
class SetInfo:
def __init__(self, set_name, info_row, member_rows):
self.root_info = info_row
self.set_name = set_name
self.member_map = {}
self.root_name = info_row['node_name']
self.root_type = info_row['node_type']
self.global_watermark = info_row['global_watermark']
for r in member_rows:
n = MemberInfo(r)
self.member_map[n.name] = n
def get_member(self, name):
return self.member_map.get(name)
command_usage = """
%prog [options] INI CMD [subcmd args]
commands:
"""
class SetAdmin(skytools.DBScript):
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.DBScript.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 work(self):
self.set_single_loop(1)
self.set_name = self.cf.get('set_name')
if self.is_cmd("init-root", 2):
self.init_node("root", self.args[2], self.args[3])
elif self.is_cmd("init-branch", 2):
self.init_node("branch", self.args[2], self.args[3])
elif self.is_cmd("init-leaf", 2):
self.init_node("leaf", self.args[2], self.args[3])
else:
self.log.info("need command")
def is_cmd(self, name, argcnt):
if len(self.args) < 2:
return False
if self.args[1] != name:
return False
if len(self.args) != argcnt + 2:
self.log.error("cmd %s needs %d args" % (name, argcnt))
sys.exit(1)
return True
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 Exceotion("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):
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)
# 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)
# configured db may not be root anymore, walk upwards then
if type in ('root', 'combined-root'):
db.commit()
return db
self.close_connection()
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 exec_sql(self, db, q, args):
self.log.debug(q)
curs = db.cursor()
curs.execute(q, args)
db.commit()
def exec_query(self, db, q, args):
self.log.debug(q)
curs = db.cursor()
curs.execute(q, args)
res = curs.dictfetchall()
db.commit()
return res
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()
if __name__ == '__main__':
script = SetAdmin('set_admin', sys.argv[1:])
script.start()
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