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A configuration client for AWS serverless Python systems

Project description

A simple configuration client for AWS serverless Python systems.


from serverless_config import default_config
config = default_config()

string_prop = config.get_str('string_prop')
int_prop = condfig.get_int('missing_int_prop', default_value=123)

The default config will search for a parameter with the following order of precedence: System Environment, AWS SSM Parameter Store. You can learn more about them below.

Supported Config Sources

System Environment

The System environment is a good place to store microservice-specific parameters. They are set on the lambda function itself.

from serverless_config import env_config
config = env_config()

AWS SSM Parameter Store

SSM is perfect for storing parameters that are shared across microservices. It is fully managed, and does not require any configuration to get started.

Note: the IAM role requires the AmazonSSMReadOnlyAccess policy to get properties from SSM.

from serverless_config import ssm_config
config = ssm_config()

Composite Configs

The default_config will first search in the system environment. If the parameter is not there, then it will search in AWS SSM.

from serverless_config import default_config
config = default_config()

Custom Configs

You can even implement your own custom configs and composite configs!

from serverless_config import ConfigBase, custom_composite_config, env_config

class DictConfig(ConfigBase):

    def __init__(self, prop_dict):
        self.prop_dict = prop_dict

    def get_str(prop_name, default_value=None):
        if prop_name in self.prop_dict:
            return self.prop_dict[prop_name]
        elif default_value:
            return default_value

        # You must raise a ValueError if the property is not found
        raise ValueError('Property not found: ' + prop_name)

# You can make a standalone custom config
props = dict(foo='bar', toll='troll')
map_config = DictConfig(props)

# And you can make a custom composite config with your new config
custom_config = custom_composite_config(map_config, env_config())

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