Class: MwrapRack

Inherits:
Object
  • Object
show all
Defined in:
lib/mwrap_rack.rb

Overview

MwrapRack is a standalone Rack application which can be mounted to run within your application process.

Using the Rack::Builder API in config.ru, you can map it to the “/MWRAP/” endpoint. As with the rest of the Mwrap API, your Rack server needs to be spawned with the mwrap(1) wrapper to enable the LD_PRELOAD.

require 'mwrap_rack'
map('/MWRAP') { run(MwrapRack.new) }
map('/') { run(your_normal_app) }

A live demo is available at 80x24.org/MWRAP/ (warning the demo machine is 32-bit, so counters will overflow)

This module is only available in mwrap 2.0.0+

Defined Under Namespace

Modules: HtmlResponse Classes: Each, EachAt, HeapPages

Instance Method Summary collapse

Instance Method Details

#call(env) ⇒ Object

The standard Rack application endpoint for MwrapRack



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# File 'lib/mwrap_rack.rb', line 147

def call(env)
  case env['PATH_INFO']
  when %r{\A/each/(\d+)\z}
    min = $1.to_i
    m = env['QUERY_STRING'].match(/\bsort=(\w+)/)
    Each.new(env['SCRIPT_NAME'], min, m ? m[1] : nil).response
  when %r{\A/at/(.*)\z}
    loc = -CGI.unescape($1)
    loc = Mwrap[loc] or return r404
    EachAt.new(loc).response
  when '/heap_pages'
    HeapPages.new.response
  when '/'
    n = 2000
    u = 'https://80x24.org/mwrap/README.html'
    b = -('<html><head><title>Mwrap demo</title></head>' \
        "<body><p><a href=\"each/#{n}\">allocations &gt;#{n} bytes</a>" \
        "<p><a href=\"#{u}\">#{u}</a>" \
        "<p><a href=\"heap_pages\">heap pages</a>" \
        "</body></html>\n")
    [ 200, {'Content-Type'=>'text/html','Content-Length'=>-b.size.to_s},[b]]
  else
    r404
  end
end

#r404 ⇒ Object

:nodoc:



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# File 'lib/mwrap_rack.rb', line 142

def r404 # :nodoc:
  [404,{'Content-Type'=>'text/plain'},["Not found\n"]]
end