terom@94: """
terom@94:     A tornado-based HTTP app
terom@94: """
terom@94: 
terom@94: import tornado.web
terom@94: import tornado.httpserver
terom@94: import tornado.wsgi
terom@94: import werkzeug
terom@94: 
terom@94: from pngtile import handlers
terom@94: 
terom@94: class MainHandler (tornado.web.RequestHandler) :
terom@94:     """
terom@94:         Main handler for the / URL, pass off requests to werkzeug-based handlers...
terom@94:     """
terom@94: 
terom@94:     def build_environ (self, path) :
terom@94:         """
terom@94:             Yield a series of (key, value) pairs suitable for use with WSGI
terom@94:         """
terom@94: 
terom@94:         request = self.request
terom@94: 
terom@94:         hostport = request.host.split(":")
terom@94: 
terom@94:         if len(hostport) == 2:
terom@94:             host = hostport[0]
terom@94:             port = int(hostport[1])
terom@94:         else:
terom@94:             host = request.host
terom@94:             port = 443 if request.protocol == "https" else 80
terom@94: 
terom@94:         yield "REQUEST_METHOD", request.method
terom@94:         yield "SCRIPT_NAME", ""
terom@94:         yield "PATH_INFO", path
terom@94:         yield "QUERY_STRING", request.query
terom@94:         yield "SERVER_NAME", host
terom@94:         yield "SERVER_PORT", port
terom@94: 
terom@94:         yield "wsgi.version", (1, 0)
terom@94:         yield "wsgi.url_scheme", request.protocol
terom@94:         
terom@94:         yield "CONTENT_TYPE", request.headers.get("Content-Type")
terom@94:         yield "CONTENT_LENGTH", request.headers.get("Content-Length")
terom@94: 
terom@94:         for key, value in request.headers.iteritems():
terom@94:             yield "HTTP_" + key.replace("-", "_").upper(), value
terom@94:     
terom@94:     def get (self, path) :
terom@94:         environ = dict(self.build_environ(path))
terom@94: 
terom@94:         # build Request
terom@94:         request = werkzeug.Request(environ)
terom@94: 
terom@94:         # handle
terom@94:         try :
terom@94:             response = handlers.handle_req(request)
terom@94: 
terom@94:         except werkzeug.exceptions.HTTPException, ex :
terom@94:             response = ex
terom@94: 
terom@94:         # return
terom@94:         def start_response (_status, _headers) :
terom@94:             status = int(_status.split()[0])
terom@94:             headers = _headers
terom@94: 
terom@94:             self.set_status(status)
terom@94: 
terom@94:             for name, value in headers :
terom@94:                 self.set_header(name, value)
terom@94:         
terom@94:         # invoke Response
terom@94:         data = response(environ, start_response)
terom@94: 
terom@94:         # output data
terom@94:         for chunk in data :
terom@94:             self.write(chunk)
terom@94:         
terom@94: def build_app () :
terom@94:     return tornado.web.Application([
terom@94:         # static, from $CWD/static/
terom@94:         (r"/static/(.*)",           tornado.web.StaticFileHandler,  dict(path = "static/")),
terom@94:         
terom@94:         # dir listings, image html, PNG tiles
terom@94:         (r"(/.*)",     MainHandler),
terom@94:     ])  
terom@94: 
terom@94: def build_httpserver (app, port) :
terom@94:     server = tornado.httpserver.HTTPServer(app)
terom@94:     server.listen(port)
terom@94: 
terom@94:     return server
terom@94: 
terom@94: def main (port=8000) :
terom@94:     """
terom@94:         Build the app, http server and run the main loop
terom@94:     """
terom@94: 
terom@94:     import logging
terom@94: 
terom@94:     logging.basicConfig(level=logging.DEBUG)
terom@94: 
terom@94:     app = build_app()
terom@94:     server = build_httpserver(app, port)
terom@94: 
terom@94:     tornado.ioloop.IOLoop.instance().start()
terom@94: 
terom@94: