Helper library for using pika.
Pikacon is a helper library which will reduce the amount of boilerplate your software needs when it is using pika for creating connection to broker and declaring exchanges and queues. With pikacon you get your queues up and running easily without compromises.
Pikacon provides helper class which can be imported to your program. Class takes a path to .ini-style config file as a parameter and creates connection, exchanges, queues and bindings automatically from there. All you need to provide is a proper config.
Creation order is following:
Pikacon uses Pythons ConfigParser to get config for connection, exchanges and queues.
Broker is configured as in below example. Section name is broker and options are regular pika parameters for broker. If you want to configure ssl_options create new section for those and refer that section name in broker options. Eg.:
[broker] ... ssl = True ssl_options = my_ssl_options [my_ssl_options] ...
Section name for exchange consists of two parts divided by ‘:’. First part is ‘exchange’ and second part is the name of the exchange. Eg.:
The actual options below exchange section are normal key = value parameters which are used in pika.
The section for queue consits of two parts divided by ‘:’. First part is ‘queue’ and second part is the name of the queue. Eg.:
The options below queue section are:
durable = True|False exclusive = True|False arguments = queue:queuename:arguments
Extra arguments for the queue are provided by another section. Pikacon assumes that the name of the arguments section follows following convention ‘queue:queuename:nameofargumentssection’.
The actual options below queue section are normal key = value parameters which are used in pika.
The name of the binding section consists three parts divided by ‘:’. First part is always ‘binding’. Second part is the name of the queue we’re binding. Third part is name of the exchange where we’re binding the queue. Eg.:
The actual options below binding section are normal key = value parameters which are used in pika.
[broker] host = localhost port = 5672 username = guest password = guest virtual_host = / heartbeat = 60 [exchange:exchangename] type = direct durable = False auto_delete = True [queue:testqueue1] durable = True exclusive = False [queue:testqueue2] durable = False exclusive = False [queue:testqueue3] durable = True exclusive = False arguments = queue:testqueue3:arguments [queue:testqueue4] durable = True exclusive = False [queue:testqueue3:arguments] x-message-ttl = 1800000 x-dead-letter-exchange = exchangename x-dead-letter-routing-key = key4 [binding:testqueue1:exchangename] routing_key = key1 [binding:testqueue2:exchangename] routing_key = key2 [binding:testqueue3:exchangename] routing_key = key3 [binding:testqueue4:exchangename] routing_key = key4
Above example configures connection to broker at localhost. It defines one direct exchange called exchangename and four queues called testqueue1, testqueue2, testqueue3 and testqueue4. Testqueue3 has extra arguments which define dead letter exchange. All queues are bound to our only exchange with routingkeys key1, key2, key3 and key4.