endpoints4s.algebra.Errors.scala Maven / Gradle / Ivy
package endpoints4s.algebra
import endpoints4s.Invalid
/**
* Defines the error types used to model client and server errors.
*
* The `ClientErrors` type is used by endpoints4s to model errors coming
* from the client (missing query parameter, invalid entity, etc.).
*
* The `ServerError` type is used by endpoints4s to model errors coming from
* the server business logic.
*
* The `badRequest` and `internalServerError` operations defined in [[Responses]]
* define responses carrying entities of type `ClientErrors` and `ServerError`,
* respectively.
*
* Interpreters are expected to use the `clientErrorsResponse` and `serverErrorResponse`
* operations defined here to handle client and server errors, respectively.
*
* @see [[BuiltInErrors]]
* @group algebras
* @groupname types Types
* @groupdesc types Types introduced by the algebra
* @groupprio types 1
* @groupname operations Operations
* @groupdesc operations Operations creating and transforming values
* @groupprio operations 2
*/
trait Errors { this: Responses =>
/** Errors in a request built by a client
* @group types
*/
type ClientErrors
/** Error raised by the business logic of a server
* @group types
*/
type ServerError
/** Convert the endpoints4s internal client error type into the [[ClientErrors]] type
* @group operations
*/
def invalidToClientErrors(invalid: Invalid): ClientErrors
/** Convert the [[ClientErrors]] type into the endpoints4s internal client error type
* @group operations
*/
def clientErrorsToInvalid(clientErrors: ClientErrors): Invalid
/** Convert the endpoints4s internal server error type into the [[ServerError]] type
* @group operations
*/
def throwableToServerError(throwable: Throwable): ServerError
/** Convert the [[ServerError]] type into the endpoints4s internal server error type
* @group operations
*/
def serverErrorToThrowable(serverError: ServerError): Throwable
/**
* Response used by endpoints4s when decoding
* a request fails.
*
* The provided implementation forwards to `badRequest`.
*
* @group operations
*/
lazy val clientErrorsResponse: Response[ClientErrors] =
badRequest(docs = Some("Client error"))
/**
* Format of the response entity carrying the client errors.
* @group operations
*/
def clientErrorsResponseEntity: ResponseEntity[ClientErrors]
/**
* Response used by endpoints4s when the
* business logic of an endpoint fails.
*
* The provided implementation forwards to `internalServerError`
* @group operations
*/
lazy val serverErrorResponse: Response[ServerError] =
internalServerError(docs = Some("Server error"))
/**
* Format of the response entity carrying the server error.
* @group operations
*/
def serverErrorResponseEntity: ResponseEntity[ServerError]
}