Custom Alamofire 4 ResponseSerializer

CloudFlareResponseSerializer.swift

struct CloudFlareResponseSerializer<T: Decodable>: DataResponseSerializerProtocol where T == T.DecodedType {
    
    var serializeResponse: (URLRequest?, HTTPURLResponse?, Data?, Error?) -> Result<T> = { (request, response, data, error) in
        guard error == nil else { return .failure(CloudFlareError.network(error: error!)) }
        
        let jsonSerializationResult = DataRequest.jsonResponseSerializer().serializeResponse(request, response, data, nil)
        guard case let .success(responseJSON) = jsonSerializationResult else {
            return .failure(CloudFlareError.serialization(error: jsonSerializationResult.error!))
        }
        
        let decodedCloudFlareResponse = CloudFlareResponse.decode(JSON(responseJSON))
        guard case let .success(cloudFlareResponse) = decodedCloudFlareResponse else {
            return .failure(CloudFlareError.decoding(error: decodedCloudFlareResponse.error!))
        }
        
        guard cloudFlareResponse.isSuccess else { return .failure(CloudFlareError.response(response: cloudFlareResponse)) }
        
        let decodedResponseValue = T.decode(cloudFlareResponse.result)
        guard case let .success(responseValue) = decodedResponseValue else {
            return .failure(CloudFlareError.decoding(error: decodedResponseValue.error!))
        }
        
        return .success(responseValue)
    }
    
}