Module aws_lambda_powertools.utilities.parameters.appconfig
AWS App Config configuration retrieval and caching utility
Expand source code
"""
AWS App Config configuration retrieval and caching utility
"""
import os
from typing import TYPE_CHECKING, Any, Dict, Optional, Union
from uuid import uuid4
import boto3
from botocore.config import Config
if TYPE_CHECKING:
from mypy_boto3_appconfig import AppConfigClient
from ...shared import constants
from ...shared.functions import resolve_env_var_choice
from .base import DEFAULT_MAX_AGE_SECS, DEFAULT_PROVIDERS, BaseProvider
CLIENT_ID = str(uuid4())
class AppConfigProvider(BaseProvider):
"""
AWS App Config Provider
Parameters
----------
environment: str
Environment of the configuration to pass during client initialization
application: str, optional
Application of the configuration to pass during client initialization
config: botocore.config.Config, optional
Botocore configuration to pass during client initialization
boto3_session : boto3.session.Session, optional
Boto3 session to create a boto3_client from
boto3_client: AppConfigClient, optional
Boto3 AppConfig Client to use, boto3_session will be ignored if both are provided
Example
-------
**Retrieves the latest configuration value from App Config**
>>> from aws_lambda_powertools.utilities import parameters
>>>
>>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app")
>>>
>>> value : bytes = appconf_provider.get("my_conf")
>>>
>>> print(value)
My configuration value
**Retrieves a configuration value from App Config in another AWS region**
>>> from botocore.config import Config
>>> from aws_lambda_powertools.utilities import parameters
>>>
>>> config = Config(region_name="us-west-1")
>>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app", config=config)
>>>
>>> value : bytes = appconf_provider.get("my_conf")
>>>
>>> print(value)
My configuration value
"""
client: Any = None
def __init__(
self,
environment: str,
application: Optional[str] = None,
config: Optional[Config] = None,
boto3_session: Optional[boto3.session.Session] = None,
boto3_client: Optional["AppConfigClient"] = None,
):
"""
Initialize the App Config client
"""
super().__init__()
self.client: "AppConfigClient" = self._build_boto3_client(
service_name="appconfig", client=boto3_client, session=boto3_session, config=config
)
self.application = resolve_env_var_choice(
choice=application, env=os.getenv(constants.SERVICE_NAME_ENV, "service_undefined")
)
self.environment = environment
self.current_version = ""
def _get(self, name: str, **sdk_options) -> str:
"""
Retrieve a parameter value from AWS App config.
Parameters
----------
name: str
Name of the configuration
sdk_options: dict, optional
Dictionary of options that will be passed to the client's get_configuration API call
"""
sdk_options["Configuration"] = name
sdk_options["Application"] = self.application
sdk_options["Environment"] = self.environment
sdk_options["ClientId"] = CLIENT_ID
response = self.client.get_configuration(**sdk_options)
return response["Content"].read() # read() of botocore.response.StreamingBody
def _get_multiple(self, path: str, **sdk_options) -> Dict[str, str]:
"""
Retrieving multiple parameter values is not supported with AWS App Config Provider
"""
raise NotImplementedError()
def get_app_config(
name: str,
environment: str,
application: Optional[str] = None,
transform: Optional[str] = None,
force_fetch: bool = False,
max_age: int = DEFAULT_MAX_AGE_SECS,
**sdk_options
) -> Union[str, list, dict, bytes]:
"""
Retrieve a configuration value from AWS App Config.
Parameters
----------
name: str
Name of the configuration
environment: str
Environment of the configuration
application: str
Application of the configuration
transform: str, optional
Transforms the content from a JSON object ('json') or base64 binary string ('binary')
force_fetch: bool, optional
Force update even before a cached item has expired, defaults to False
max_age: int
Maximum age of the cached value
sdk_options: dict, optional
Dictionary of options that will be passed to the boto client get_configuration API call
Raises
------
GetParameterError
When the parameter provider fails to retrieve a parameter value for
a given name.
TransformParameterError
When the parameter provider fails to transform a parameter value.
Example
-------
**Retrieves the latest version of configuration value from App Config**
>>> from aws_lambda_powertools.utilities.parameters import get_app_config
>>>
>>> value = get_app_config("my_config", environment="my_env", application="my_env")
>>>
>>> print(value)
My configuration value
**Retrieves a configuration value and decodes it using a JSON decoder**
>>> from aws_lambda_powertools.utilities.parameters import get_app_config
>>>
>>> value = get_app_config("my_config", environment="my_env", application="my_env", transform='json')
>>>
>>> print(value)
My configuration's JSON value
"""
# Only create the provider if this function is called at least once
if "appconfig" not in DEFAULT_PROVIDERS:
DEFAULT_PROVIDERS["appconfig"] = AppConfigProvider(environment=environment, application=application)
sdk_options["ClientId"] = CLIENT_ID
return DEFAULT_PROVIDERS["appconfig"].get(
name, max_age=max_age, transform=transform, force_fetch=force_fetch, **sdk_options
)Functions
def get_app_config(name: str, environment: str, application: Optional[str] = None, transform: Optional[str] = None, force_fetch: bool = False, max_age: int = 5, **sdk_options) ‑> Union[str, list, dict, bytes]-
Retrieve a configuration value from AWS App Config.
Parameters
name:str- Name of the configuration
environment:str- Environment of the configuration
application:str- Application of the configuration
transform:str, optional- Transforms the content from a JSON object ('json') or base64 binary string ('binary')
force_fetch:bool, optional- Force update even before a cached item has expired, defaults to False
max_age:int- Maximum age of the cached value
sdk_options:dict, optional- Dictionary of options that will be passed to the boto client get_configuration API call
Raises
GetParameterError- When the parameter provider fails to retrieve a parameter value for a given name.
TransformParameterError- When the parameter provider fails to transform a parameter value.
Example
Retrieves the latest version of configuration value from App Config
>>> from aws_lambda_powertools.utilities.parameters import get_app_config >>> >>> value = get_app_config("my_config", environment="my_env", application="my_env") >>> >>> print(value) My configuration valueRetrieves a configuration value and decodes it using a JSON decoder
>>> from aws_lambda_powertools.utilities.parameters import get_app_config >>> >>> value = get_app_config("my_config", environment="my_env", application="my_env", transform='json') >>> >>> print(value) My configuration's JSON valueExpand source code
def get_app_config( name: str, environment: str, application: Optional[str] = None, transform: Optional[str] = None, force_fetch: bool = False, max_age: int = DEFAULT_MAX_AGE_SECS, **sdk_options ) -> Union[str, list, dict, bytes]: """ Retrieve a configuration value from AWS App Config. Parameters ---------- name: str Name of the configuration environment: str Environment of the configuration application: str Application of the configuration transform: str, optional Transforms the content from a JSON object ('json') or base64 binary string ('binary') force_fetch: bool, optional Force update even before a cached item has expired, defaults to False max_age: int Maximum age of the cached value sdk_options: dict, optional Dictionary of options that will be passed to the boto client get_configuration API call Raises ------ GetParameterError When the parameter provider fails to retrieve a parameter value for a given name. TransformParameterError When the parameter provider fails to transform a parameter value. Example ------- **Retrieves the latest version of configuration value from App Config** >>> from aws_lambda_powertools.utilities.parameters import get_app_config >>> >>> value = get_app_config("my_config", environment="my_env", application="my_env") >>> >>> print(value) My configuration value **Retrieves a configuration value and decodes it using a JSON decoder** >>> from aws_lambda_powertools.utilities.parameters import get_app_config >>> >>> value = get_app_config("my_config", environment="my_env", application="my_env", transform='json') >>> >>> print(value) My configuration's JSON value """ # Only create the provider if this function is called at least once if "appconfig" not in DEFAULT_PROVIDERS: DEFAULT_PROVIDERS["appconfig"] = AppConfigProvider(environment=environment, application=application) sdk_options["ClientId"] = CLIENT_ID return DEFAULT_PROVIDERS["appconfig"].get( name, max_age=max_age, transform=transform, force_fetch=force_fetch, **sdk_options )
Classes
class AppConfigProvider (environment: str, application: Optional[str] = None, config: Optional[botocore.config.Config] = None, boto3_session: Optional[boto3.session.Session] = None, boto3_client: Optional[ForwardRef('AppConfigClient')] = None)-
AWS App Config Provider
Parameters
environment:str- Environment of the configuration to pass during client initialization
application:str, optional- Application of the configuration to pass during client initialization
config:botocore.config.Config, optional- Botocore configuration to pass during client initialization
boto3_session:boto3.session.Session, optional- Boto3 session to create a boto3_client from
boto3_client:AppConfigClient, optional- Boto3 AppConfig Client to use, boto3_session will be ignored if both are provided
Example
Retrieves the latest configuration value from App Config
>>> from aws_lambda_powertools.utilities import parameters >>> >>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app") >>> >>> value : bytes = appconf_provider.get("my_conf") >>> >>> print(value) My configuration valueRetrieves a configuration value from App Config in another AWS region
>>> from botocore.config import Config >>> from aws_lambda_powertools.utilities import parameters >>> >>> config = Config(region_name="us-west-1") >>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app", config=config) >>> >>> value : bytes = appconf_provider.get("my_conf") >>> >>> print(value) My configuration valueInitialize the App Config client
Expand source code
class AppConfigProvider(BaseProvider): """ AWS App Config Provider Parameters ---------- environment: str Environment of the configuration to pass during client initialization application: str, optional Application of the configuration to pass during client initialization config: botocore.config.Config, optional Botocore configuration to pass during client initialization boto3_session : boto3.session.Session, optional Boto3 session to create a boto3_client from boto3_client: AppConfigClient, optional Boto3 AppConfig Client to use, boto3_session will be ignored if both are provided Example ------- **Retrieves the latest configuration value from App Config** >>> from aws_lambda_powertools.utilities import parameters >>> >>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app") >>> >>> value : bytes = appconf_provider.get("my_conf") >>> >>> print(value) My configuration value **Retrieves a configuration value from App Config in another AWS region** >>> from botocore.config import Config >>> from aws_lambda_powertools.utilities import parameters >>> >>> config = Config(region_name="us-west-1") >>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app", config=config) >>> >>> value : bytes = appconf_provider.get("my_conf") >>> >>> print(value) My configuration value """ client: Any = None def __init__( self, environment: str, application: Optional[str] = None, config: Optional[Config] = None, boto3_session: Optional[boto3.session.Session] = None, boto3_client: Optional["AppConfigClient"] = None, ): """ Initialize the App Config client """ super().__init__() self.client: "AppConfigClient" = self._build_boto3_client( service_name="appconfig", client=boto3_client, session=boto3_session, config=config ) self.application = resolve_env_var_choice( choice=application, env=os.getenv(constants.SERVICE_NAME_ENV, "service_undefined") ) self.environment = environment self.current_version = "" def _get(self, name: str, **sdk_options) -> str: """ Retrieve a parameter value from AWS App config. Parameters ---------- name: str Name of the configuration sdk_options: dict, optional Dictionary of options that will be passed to the client's get_configuration API call """ sdk_options["Configuration"] = name sdk_options["Application"] = self.application sdk_options["Environment"] = self.environment sdk_options["ClientId"] = CLIENT_ID response = self.client.get_configuration(**sdk_options) return response["Content"].read() # read() of botocore.response.StreamingBody def _get_multiple(self, path: str, **sdk_options) -> Dict[str, str]: """ Retrieving multiple parameter values is not supported with AWS App Config Provider """ raise NotImplementedError()Ancestors
- BaseProvider
- abc.ABC
Class variables
var client : Any
Inherited members