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WebApp() click to toggle source

WebApp is a main routine of web application. It should be called from a toplevel of a CGI/FastCGI/mod_ruby/WEBrick script.

WebApp is used as follows.

#!/usr/bin/env ruby

require 'webapp'

... class/method definitions ... # run once per process.

WebApp {|webapp| # This block runs once per request.
  ... process a request ...
}

WebApp yields with an object of the class WebApp. The object contains request and response.

WebApp rise $SAFE to 1.

WebApp catches all kind of exception raised in the block. If HTTP connection is made from localhost or a developper host, the backtrace is sent back to the browser. Otherwise, the backtrace is sent to stderr usually which is redirected to error.log. The developper hosts are specified by the environment variable WEBAPP_DEVELOP_HOST. It may be an IP address in dotted-decimal format such as "192.168.1.200" or an network address such as "192.168.1.200/24". (An environment variable for CGI can be set by SetEnv directive in Apache.)

# File webapp.rb, line 479
def WebApp(&block) # :yields: webapp
  $SAFE = 1 if $SAFE < 1
  manager = WebApp::Manager.new(block)
  if defined?(Apache::Request) && Apache.request.kind_of?(Apache::Request)
    run = lambda { manager.run_rbx }
  elsif Thread.current[:webrick_load_servlet]
    run = lambda { manager.run_webrick }
  elsif STDIN.respond_to?(:stat) && STDIN.stat.socket? &&
        begin
          # getpeername(FCGI_LISTENSOCK_FILENO) causes ENOTCONN on FastCGI
          # cf. http://www.fastcgi.com/devkit/doc/fcgi-spec.html
          require 'socket'
          sock = Socket.for_fd(0)
          sock.getpeername
          false
        rescue Errno::ENOTCONN
          true
        rescue SystemCallError
          false
        end
    run = lambda { manager.run_fcgi }
  elsif ENV.include?('REQUEST_METHOD')
    run = lambda { manager.run_cgi }
  else
    require 'webapp/cli'
    run = lambda { manager.run_cli }
  end
  if Thread.current[:webapp_delay]
    Thread.current[:webapp_proc] = run
  else
    run.call
  end
end

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