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jsonrpc2_service

0.1.0
0.1.1 0.1.0

Provides the ability to create services in accordance with the JSONRPC 2.0 specification. There is no transport layer, but only tools for creating transport-independent JSONRPC 2.0 services.

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jsonrpc2_service lib jsonrpc2 service validator rule.ex
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lib/jsonrpc2/service/validator/rule.ex 

defmodule JSONRPC2.Service.Validator.Rule do

  @type ok :: :ok

  @type error :: {:error, String.t(), keyword()}

  @type rule :: (term() -> ok() | error())

  @type result :: :ok | error()

  @type value :: nil | term()

  @type opts :: keyword()



  @callback rule(keyword()) :: rule()

  @callback check(term(), keyword()) :: ok() | error()



  defmacro __using__(_) do

    quote location: :keep do

      def rule(opts \\ []) do

        fn

          (nil)   -> :ok

          (value) -> check(value, opts)

        end

      end



      defoverridable [rule: 1]



      defp error(message, opts \\ []),

        do: {:error, message, opts}

    end

  end

end