Class: Roda::RodaPlugins::Middleware::Forwarder

Inherits:
Object
  • Object
show all
Defined in:
lib/roda/plugins/middleware.rb

Overview

Forward instances are what is actually used as middleware.

Instance Method Summary collapse

Constructor Details

#initialize(mid, app, *args, &block) ⇒ Forwarder

Store the current middleware and the next middleware to call.



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# File 'lib/roda/plugins/middleware.rb', line 83

def initialize(mid, app, *args, &block)
  @mid = if configure = mid.opts[:middleware_configure]
    mid = Class.new(mid)
    configure.call(mid, *args, &block)
    mid
  else
    raise RodaError, "cannot provide middleware args or block unless loading middleware plugin with a block" if block || !args.empty?
    mid
  end
  @app = app
end

Instance Method Details

#call(env) ⇒ Object

When calling the middleware, first call the current middleware. If this returns a result, return that result directly. Otherwise, pass handling of the request to the next middleware.



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# File 'lib/roda/plugins/middleware.rb', line 98

def call(env)
  res = nil

  call_next = catch(:next) do
    env[@mid.opts[:middleware_env_var]] = true
    res = @mid.call(env)
    false
  end

  if call_next
    @app.call(env)
  else
    res
  end
end