class Roda::RodaPlugins::Middleware::Forwarder
Forwarder
instances are what is actually used as middleware.
Public Class Methods
Source
# File lib/roda/plugins/middleware.rb, line 135 def initialize(mid, app, *args, &block) @mid = Class.new(mid) RodaPlugins.set_temp_name(@mid){"#{mid}::middleware_subclass"} if @mid.opts[:middleware_next_if_not_found] @mid.plugin(:not_found, &NEXT_PROC) end if configure = @mid.opts[:middleware_configure] configure.call(@mid, *args, &block) elsif block || !args.empty? raise RodaError, "cannot provide middleware args or block unless loading middleware plugin with a block" end @app = app end
Make a subclass of mid
to use as the current middleware, and store app
as the next middleware to call.
Public Instance Methods
Source
# File lib/roda/plugins/middleware.rb, line 152 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 res = @app.call(env) if modified_headers = env.delete('roda.response_headers') res[1] = modified_headers.merge(res[1]) end end if handle_result = @mid.opts[:middleware_handle_result] handle_result.call(env, res) end res end
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.