lib/popcorn/popcorn.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2016 Alexandre Terrasa <alexandre@moz-code.org>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Application server abstraction on top of nitcorn.
  18 module popcorn
  19
  20 import nitcorn
  21 import pop_middlewares
  22 intrude import pop_handlers
  23
  24 # App acts like a wrapper around a nitcorn `Action`.
  25 redef class App
  26         super Action
  27
  28         # Do not show anything on console
  29         var quiet = false is writable
  30
  31         # Start listening on `host:port`.
  32         fun listen(host: String, port: Int) do
  33                 var iface = "{host}:{port}"
  34                 var vh = new VirtualHost(iface)
  35
  36                 vh.routes.add new Route("/", self)
  37
  38                 var fac = new HttpFactory.and_libevent
  39                 fac.config.virtual_hosts.add vh
  40
  41                 if not quiet then
  42                         print "Launching server on http://{iface}/"
  43                 end
  44                 fac.run
  45         end
  46
  47         # Handle request from nitcorn
  48         redef fun answer(req, uri) do
  49                 uri = uri.simplify_path
  50                 var res = new HttpResponse(404)
  51                 for route, handler in pre_handlers do
  52                         handler.handle(route, uri, req, res)
  53                 end
  54                 for route, handler in handlers do
  55                         handler.handle(route, uri, req, res)
  56                         if res.sent then break
  57                 end
  58                 if not res.sent then
  59                         res.send(error_tpl(res.status_code, res.status_message), 404)
  60                 end
  61                 for route, handler in post_handlers do
  62                         handler.handle(route, uri, req, res)
  63                 end
  64                 res.session = req.session
  65                 return res
  66         end
  67
  68         #
  69         fun error_tpl(status: Int, message: nullable String): Template do
  70                 return new ErrorTpl(status, message)
  71         end
  72 end
  73
  74 #
  75 class ErrorTpl
  76         super Template
  77
  78         #
  79         var status: Int
  80
  81         #
  82         var message: nullable String
  83
  84         redef fun rendering do add """
  85                 <!DOCTYPE html>
  86                 <html>
  87                 <head>
  88                         <meta charset="utf-8">
  89                         <title>{{{message or else status}}}</title>
  90                 </head>
  91                 <body>
  92                 <h1>{{{status}}} {{{message or else ""}}}</h1>
  93                 </body>
  94                 </html>"""
  95
  96 end