consul-options - Define and use your project settings without pain

How often do you wonder where to store the project settings? When your project is small it is not a big problem. But if your big project consists of dozens of microservices then there is a problem of centralized configuration management. The Сonsul have a key/value storage that is ideal for this.

With consul-options you can define and use options in your code by a simple and elegant way. Just take a look at the example:

class DB(ConsulKV):
    pass


class Users(DB):
    host = '127.0.0.1'
    port = 5432
    user = 'postgres'
    password = 'postgres'

    dbname = 'users'


class Orders(DB):
    host = '127.0.0.1'
    port = 5432
    user = 'postgres'
    password = 'postgres'

    dbname = 'orders'

Now you can access option values in a clear way:

from consul_options import options

print options.db.users.host
print options.db.orders.dbname

consul-options automagically creates folders and keys with default values defined above in Consul and later read them from there. So if anyone will change the value of db/orders/host key to something different in Consul then you will get that value.

How project options stored in Consul

When you declare a new class based on ConsulKV default bahavior is creation a folder in Consul key/value storage with name of your class in lowercase. Each class attribute you define will have mapping to key folder/key. If you don't agree with generated folder name you are free to choose any other with reserved class attribute __key__ as shown below:

class WorkerOptions(ConsulKV):
    __key__ = 'worker'

    host = '127.0.0.1'
    port = 80

After that you can access to the option with "worker" in path:

from consul_options import options

print options.worker.host
print options.worker.port

To create hierarchical key structure you can take advantage of usual class hierarchy:

from consul_options import ConsulKV, options

class WorkerOptions(ConsulKV):
    __key__ = 'worker'

    host = '127.0.0.1'
    port = 80

class DB(WorkerOptions):
    host = '127.0.0.1'
    port = 5432
    user = 'postgres'
    password = 'postgres'

print options.worker.db.host  # 'host'
print options.worker.db.port  # 5432

It is also possible to create keys at root level with class attribute __root__:

class RootOptions(ConsulKV):
    __root__ = True

    host = '127.0.0.1'
    port = 80

print options.host
print options.port

Compatibility

consul-options is compatible with both Python 2 and Python 3.

Installation

Use pip to install:

$ pip install consul-options

License

consul-options is developed and distributed under the Apache 2.0 license.