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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/absinthe/middleware.ex
defmodule Cqrs.Absinthe.Middleware do
@moduledoc false
alias Cqrs.Absinthe.Middleware
alias Cqrs.Absinthe.InvalidMiddlewareFunction
defmacro before_resolve(module, opts) do
quote do
alias Cqrs.Absinthe.Middleware
Middleware.ensure_middelware_function!(unquote(module), unquote(opts), :before_resolve)
middleware fn res, config ->
fun = Middleware.middelware_function(unquote(opts), :before_resolve)
fun.(res, config)
end
end
end
defmacro after_resolve(module, opts) do
quote do
alias Cqrs.Absinthe.Middleware
Middleware.ensure_middelware_function!(unquote(module), unquote(opts), :after_resolve)
middleware fn res, config ->
fun = Middleware.middelware_function(unquote(opts), :after_resolve)
fun.(res, config)
end
end
end
def passthrough(res, _), do: res
def ensure_middelware_function!(module, opts, position) do
case middelware_function(opts, position) do
fun when is_function(fun, 2) -> fun
_ -> raise InvalidMiddlewareFunction, module: module, position: position
end
end
def middelware_function(opts, position) do
Keyword.get(opts, position, &Middleware.passthrough/2)
end
end