ul-api-utils 7.3.8

Python api utils

Generic library api-utils

Provides common api-related functionality that can be used across different services.

Contains all api-related packages as dependencies. If you need to use some package that is not available in your service, you should add it here.

Common functionality & Modules

This section describes some classes or methods that are available for use in all services that use api-utils.

ApiResource module

ApiRequestQuery

class ApiRequestQuery(BaseModel):
    sort: Optional[str] = None
    filter: Optional[str] = None
    limit: Optional[int] = None
    offset: Optional[int] = None
    page: Optional[int] = None

Provides basic functionality to the API request.

1. Validation of empty values (replaces empty string to null/None) in API requests.
2. Pagination if provided.
3. Filtering by filter params if provided.
4. Sorting by sort params if provided.

If you want to add some additional by-default behavior to ApiRequestQuery than you have to add it here.

ApiResource

class ApiResource:
    def __init__(
        self,
        *,
        logger: logging.Logger,
        debugger_enabled: bool,
        type: ApiResourceType,
        config: ApiSdkConfig,
        access: PermissionDefinition,
        headers: Mapping[str, str],
        api_resource_config: Optional[ApiResourceConfig] = None,
        fn_typing: ApiResourceFnTyping,
    ) -> None:
        self._debugger_enabled = debugger_enabled
        self._token: Optional[ApiSdkJwt] = None
        self._token_raw: Optional[str] = None
        self._type = type
        self._config = config
        self._api_resource_config = api_resource_config or ApiResourceConfig()
        self._fn_typing = fn_typing
        self._logger = logger

        self._headers = headers
        self._access = access
        self._method = ApiMethod(str(request.method).strip().upper())  # todo: move it in host function
        self._internal_use__files_to_clean: Set[str] = set()
        self._now = datetime.now()

Provides basic functionality to the API resource. Defines common properties for every API resourse.

ApiResource properties	Desription
ApiResource.debugger_enabled	Returns boolean value indicating that debugger is enabled/disabled.
ApiResource.logger	Returns ApiResource logger.
ApiResource.method	Returns ApiResource API method (GET, POST, PUT, PATCH, DELETE, OPTIONS).
ApiResource.request_files	Returns files that are attached to Flask API request.
ApiResource.request_headers	Returns request headers that are attached to request.
ApiResource.request_info	Returns request information that is attached to request (user-agent, ip).
ApiResource.auth_token, ApiResource.auth_token_raw	Returns token or raw token.

Internal API module

Internal API

Provides InternalAPI class with basic functionality to support the requests between internal services. Implements a wrapper for all types of requests: GET, POST, PUT, PATCH, DELETE.

Internal API Response

Provides InternalApiResponse class with basic properties of Response, such as: .ok, .total_count, .count, .errors, .payload, .status_code, .result_bytes, .result_text, .result_json.

API SDK Module

Provides debugger setup for every service that uses it, useful decorators to build views, etc. In order to use it in another service, SDK should be initialized and here an example.

web_sdk = ApiSdk(ApiSdkConfig(
    permissions=your_permissions,
    jwt_validator=your_validator,
    not_found_template=path/to/template,
    rate_limit=your_rate_limit,
    other_params_are_listed_below=please_read_them
))

API SDK Config

Provides configuration for the API SDK.

class ApiSdkConfig(BaseModel):
    permissions: Optional[Union[Callable[[], PermissionRegistry], PermissionRegistry]] = None
    permissions_check_enabled: bool = True  # GLOBAL CHECK OF ACCESS AND PERMISSIONS ENABLE
    permissions_validator: Optional[Callable[[ApiSdkJwt, PermissionDefinition], bool]] = None

    jwt_validator: Optional[Callable[[ApiSdkJwt], bool]] = None
    jwt_environment_check_enabled: bool = True

    http_auth: Optional[ApiSdkHttpAuth] = None

    static_url_path: Optional[str] = None

    not_found_template: Optional[str] = None

    rate_limit: Union[str, List[str]] = '100/minute'  # [count (int)] [per|/] [second|minute|hour|day|month|year][s]
    rate_limit_storage_uri: str = ''  # supports url of redis, memcached, mongodb
    rate_limit_identify: Union[ApiSdkIdentifyTypeEnum, Callable[[], str]] = ApiSdkIdentifyTypeEnum.DISABLED  # must be None if disabled

    api_route_path_prefix: str = '/api'

    class Config:
        extra = Extra.forbid
        allow_mutation = False
        frozen = True
        arbitrary_types_allowed = True

Also, API SDK provides useful decorators that help to create views (web based, API endpoints, file download endpoints).

@web_sdk.html_view(method, path, access=permission, config=ApiResourceConfig)
@web_sdk.rest_api(method, path, access=permission, config=ApiResourceConfig, v='v1')

Worker SDK

Provides a useful decorator for message handling that adds logging, Sentry monitoring and WorkerContext.

from src.conf.worker_sdk import worker_sdk

initialized_worker = worker_sdk.init(__name__)


__all__ = (
    'initialized_worker',
)

@initialized_worker.handle_message()
def some_worker_function(params):
    ...

Custom Shared Validators

Library has some commonly-used validators available for use in other services to avoid code duplication. If you think that some services will benefit from adding a new one that can be shared, you are welcome.

Validate UUID

def validate_uuid4(uuid: Any) -> None:
    try:
        UUID(uuid, version=4)
    except ValueError:
        raise SimpleValidateApiError('invalid uuid')

Validate empty object

def validate_empty_object(obj_id: str, model: Any) -> Any:
    obj = model.query.filter_by(id=obj_id).first()
    if not obj:
        raise SimpleValidateApiError(f'{model.__name__} data was not found')
    return obj

Custom Exceptions

Exception	Desription
AbstractApiError	Services can inherit from this error and create own service-oriented API Exceptions. Should not be raised.
AbstractInternalApiError	Services can inherit from this error and create own service-oriented Internal-API Exceptions. Should not be raised.
RequestAbstractInternalApiError	Services can inherit from this error and create own Exceptions, that should be used before sending a request to another service. Should not be raised.
ResponseAbstractInternalApiError	Services can inherit from this error and create own Exceptions, that should be used after getting a response from another service. Should not be raised.
ResponseFormatInternalApiError	Should be raised when the response format from another service is incorrect.
ResponseJsonSchemaInternalApiError	Should be raised when the response schema from another service is incorrect.
ResponsePayloadTypeInternalApiError	Should be raised when the response payload types from another services aren't matching.
Server5XXInternalApiError	Should be raised when the response status from another service is 5xx. (something wrong at receiving end)
Client4XXInternalApiError	Should be raised when the response status from another service is 4xx. (something wrong at sender end)
UserAbstractApiError	Services can inherit from this error and create own Exceptions, that should be used only to stop request handling and only in API-routes. Should not be raised.
ValidationListApiError	Should be raised when the incoming request is invalid because of validation.
ValidateApiError	Should be raised when the incoming request is invalid because of validation.
AccessApiError	Should be raised when API-call sender does not have an access to the API.
AccessApiError	Should be raised when API-call sender do es not have an access to the API.
PermissionDeniedApiError	Should be raised when API-call sender does not have required permissions to access the API.
NoResultFoundApiError	Should be raised when we can't return a response because required data does not exist.
HasAlreadyExistsApiError	Should be raised when we can't create a new record because the same one already exists.

Adding new api-related package

First, try to understand why do you need this library and what exactly can you do with it. Look at the list of already existing libraries and think if they can fulfill your needs.

Check this library for deprecation, does it have enough maintenance, library dependencies. If all above satisfies you, perform next steps:

1. Add the package name and version to Pipfile under [packages] section. Example: alembic = "==1.8.1".
2. Run pipenv install.
3. Add the package name and version to setup.py to install-requires section.
4. Commit changes. git commit -m "Add dependency *library-name*".
5. Run version patch: pipenv run version_patch.
6. Push changes directly to dev git push origin dev --tags or raise MR for your changes to be reviewed.

Example

FLASK_DEBUG=1 FLASK_ENV=development FLASK_APP=example.example_app APPLICATION_DIR=$(pwd)/example APPLICATION_DEBUG=1 flask run --port 5001

How to debug using PyCharm Professional:

How to create keys

pipenv run enc_keys --algorithm=RS256 --service-name some --follower-services foo bar --jwt-permissions-module example.permissions --jwt-user-id 03670a66-fb50-437e-96ae-b42bb83e3d04 --jwt-environment=local

pipenv run enc_keys --algorithm ES256 --service-name some --follower-services foo bar --jwt-permissions-module example.permissions --jwt-user-id 03670a66-fb50-437e-96ae-b42bb83e3d04 --jwt-environment=local