Configuration improvements

Global config object

The new nameko.config dictionary allows you to access service configuration at any time, including service class definition:

from nameko.messaging import Consumer
from nameko import config

class Service:

    @consume(
        queue=Queue(
            exchange=config["MY_EXCHANGE"],
            routing_key=config["MY_ROUTING_KEY"],
            name=config["MY_QUEUE_NAME"]
        ),
        prefetch_count=config["MY_CONSUMER_PREFETCH_COUNT"]
    )
    def consume(self, payload):
        pass

As you can see having config available outside service container also helps with configuring entrypoints and dependency providers by passing options to their constructors:

from nameko import config
from nameko_sqlalchemy import Database

class Service:
    db = Database(engine_options=config["DB_ENGINE_OPTIONS"])

Declaration of config in the CLI

Sometimes it’s helpful to define config entries on the fly when running a service or shell:

$ nameko run service \
--define AMQP_URI=pyamqp://someuser:*****@somehost/ \
--define max_workers=1000 \
--define SLACK="{'TOKEN': '*****'}"