def register_consumer(self, provider_loc = None): """Register consumer on source node first, then target node.""" if not provider_loc: provider_loc = self.options.provider if not provider_loc: self.log.error('Please give provider location with --provider=') sys.exit(1) dst_db = self.get_database(self.target_db) dst_curs = dst_db.cursor() src_db = self.get_database(PDB, connstr = provider_loc) src_curs = src_db.cursor() # check target info q = "select * from pgq_node.get_node_info(%s)" res = self.exec_cmd(src_db, q, [ self.queue_name ]) pnode = res[0]['node_name'] if not pnode: raise Exception('parent node not initialized?') # source queue BaseConsumer.register_consumer(self) # fetch pos q = "select last_tick from pgq.get_consumer_info(%s, %s)" src_curs.execute(q, [self.queue_name, self.consumer_name]) last_tick = src_curs.fetchone()['last_tick'] if not last_tick: raise Exception('registration failed?') src_db.commit() # target node q = "select * from pgq_node.register_consumer(%s, %s, %s, %s)" self.exec_cmd(dst_db, q, [self.queue_name, self.consumer_name, pnode, last_tick])
def register_consumer(self, provider_loc = None): """Register consumer on source node first, then target node.""" if not provider_loc: provider_loc = self.options.provider if not provider_loc: self.log.error('Please give provider location with --provider=') sys.exit(1) dst_db = self.get_database(self.target_db) dst_curs = dst_db.cursor() src_db = self.get_database(PDB, connstr = provider_loc, profile = 'remote') src_curs = src_db.cursor() # check target info q = "select * from pgq_node.get_node_info(%s)" res = self.exec_cmd(src_db, q, [ self.queue_name ]) pnode = res[0]['node_name'] if not pnode: raise Exception('parent node not initialized?') # source queue BaseConsumer.register_consumer(self) # fetch pos q = "select last_tick from pgq.get_consumer_info(%s, %s)" src_curs.execute(q, [self.queue_name, self.consumer_name]) last_tick = src_curs.fetchone()['last_tick'] if not last_tick: raise Exception('registration failed?') src_db.commit() # target node q = "select * from pgq_node.register_consumer(%s, %s, %s, %s)" self.exec_cmd(dst_db, q, [self.queue_name, self.consumer_name, pnode, last_tick])
def exception_hook(self, det, emsg): try: dst_db = self.get_database(self.target_db) q = "select * from pgq_node.set_consumer_error(%s, %s, %s)" self.exec_cmd(dst_db, q, [ self.queue_name, self.consumer_name, emsg ]) except: self.log.warning("Failure to call pgq_node.set_consumer_error()") self.reset() BaseConsumer.exception_hook(self, det, emsg)
def unregister_consumer(self): dst_db = self.get_database(self.target_db) state = self.get_consumer_state() src_db = self.get_provider_db(state) # unregister on provider BaseConsumer.unregister_consumer(self) # unregister on subscriber q = "select * from pgq_node.unregister_consumer(%s, %s)" self.exec_cmd(dst_db, q, [ self.queue_name, self.consumer_name ])
def __init__(self, service_name, db_name, args): """Initialize new consumer. @param service_name: service_name for DBScript @param db_name: target database name for get_database() @param args: cmdline args for DBScript """ BaseConsumer.__init__(self, service_name, PDB, args) self.log.debug("__init__") self.target_db = db_name self.provider_connstr = None
def startup(self): if self.options.rewind: self.rewind() sys.exit(0) if self.options.reset: self.dst_reset() sys.exit(0) return BaseConsumer.startup(self)
def init_optparse(self, parser = None): p = BaseConsumer.init_optparse(self, parser) p.add_option("--provider", help = "provider location for --register") p.add_option("--rewind", action = "store_true", help = "change queue position according to destination") p.add_option("--reset", action = "store_true", help = "reset queue pos on destination side") return p
def init_optparse(self, parser = None): p = BaseConsumer.init_optparse(self, parser) p.add_option("--provider", help = "provider location for --register") p.add_option("--rewind", action = "store_true", help = "change queue position according to destination") p.add_option("--reset", action = "store_true", help = "reset queue position on destination side") return p
def work(self): """Refresh state before calling Consumer.work().""" dst_db = self.get_database(self.target_db) self._consumer_state = self.refresh_state(dst_db) if self._consumer_state['node_type'] == 'root': self.process_root_node(dst_db) return if not self.provider_connstr: raise Exception('provider_connstr not set') src_db = self.get_provider_db(self._consumer_state) return BaseConsumer.work(self)