class Roda::RodaPlugins::Middleware::Forwarder

  1. lib/roda/plugins/middleware.rb
Superclass: Object

Forwarder instances are what is actually used as middleware.

Methods

Public Class

  1. new

Public Instance

  1. call

Public Class methods

new(mid, app, *args, &block)

Make a subclass of mid to use as the current middleware, and store app as the next middleware to call.

[show source] 
    # File lib/roda/plugins/middleware.rb
 92 def initialize(mid, app, *args, &block)
 93   @mid = Class.new(mid)
 94   if configure = @mid.opts[:middleware_configure]
 95     configure.call(@mid, *args, &block)
 96   elsif block || !args.empty?
 97     raise RodaError, "cannot provide middleware args or block unless loading middleware plugin with a block"
 98   end
 99   @app = app
100 end

Public Instance methods

call(env)

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.

[show source] 
    # File lib/roda/plugins/middleware.rb
105 def call(env)
106   res = nil
107 
108   call_next = catch(:next) do
109     env[@mid.opts[:middleware_env_var]] = true
110     res = @mid.call(env)
111     false
112   end
113 
114   if call_next
115     res = @app.call(env)
116 
117     if modified_headers = env.delete('roda.response_headers')
118       res[1] = modified_headers.merge(res[1])
119     end
120   end
121 
122   if handle_result = @mid.opts[:middleware_handle_result]
123     handle_result.call(env, res)
124   end
125 
126   res
127 end