Class: AppMap::Handler::Rails::RequestHandler::RackHook

Inherits:
AppMap::Hook::Method show all
Defined in:
lib/appmap/handler/rails/request_handler.rb

Overview

Additional hook for the Rack stack in Rails applications.

Hooking just in ActionController can be inaccurate if there’s a middleware that intercepts the response and modifies it, or catches an exception or an object and does some other processing. For example, Devise catches a throw from warden on authentication error, then runs ActionController stack AGAIN to render a login page, which it then modifies to change the HTTP status code. ActionDispatch::Executor seems a good place to hook as the central entry point in a Rails application; there are a couple middleware that sometimes sit on top of it but they’re usually inconsequential. One issue is that the executor can be entered several times in the stack (especially if Rails engines are used). To handle that, we set a context in the request environment the first time we enter it.

Constant Summary

Constants inherited from AppMap::Hook::Method

AppMap::Hook::Method::HOOK_DISABLE_KEY

Constants included from AppMap::Hook::RecordAround

AppMap::Hook::RecordAround::APPMAP_OUTPUT_DIR

Instance Attribute Summary

Attributes inherited from AppMap::Hook::Method

#arity, #hook_class, #hook_method, #hook_package, #parameters, #record_around

Instance Method Summary collapse

Methods inherited from AppMap::Hook::Method

#activate, #call

Methods included from AppMap::Hook::RecordAround

#record_around?, #record_around_after, #record_around_before

Constructor Details

#initialize ⇒ RackHook

Returns a new instance of RackHook.



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# File 'lib/appmap/handler/rails/request_handler.rb', line 149

def initialize
  super(nil, ActionDispatch::Executor, ActionDispatch::Executor.instance_method(:call))
end