(* netcgi_fcgi.mli Copyright (C) 2005-2006 Christophe Troestler email: Christophe.Troestler@umh.ac.be WWW: http://math.umh.ac.be/an/ This library is free software; see the file LICENSE for more information. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the file LICENSE for more details. *) (** FastCGI connector. * * {b Remark:} This connector does not allow requests to be multiplexed * (and let it know to the web server via FCGI_MPXS_CONNS=0). * Multiplexing requests is seldom done by * {{:http://www.fastcgi.com}FastCGI modules} and is even sometimes * impossible because of bugs in them. Moreover, multiplexing is * mostly useful if concurrent requests are handled by different * threads while this library use a single thread to process all * requests coming on a given connection. If the need is felt (speak * out!), a multithreaded connector can be built on the side of this * one. *) open Netcgi (** The usual {!Netcgi.cgi} class with FCGI specific methods. *) class type cgi = object inherit Netcgi.cgi method role : [`Responder | `Authorizer | `Filter] (** A FastCGI application can fulfill each of the following three roles: - [`Responder]: This is the usual role. In this case the application is expected to act like a CGI program: It receives all the information associated with an HTTP request and generates an HTTP response. - [`Authorizer]: An Authorizer FastCGI application receives all the information associated with an HTTP request and generates an authorized/unauthorized decision. - [`Filter]: A Filter FastCGI application receives all the information associated with an HTTP request, plus an extra stream of data from a file stored on the Web server, and generates a "filtered" version of the data stream as an HTTP response. *) method data : Netchannels.in_obj_channel (** This the the channel on which the filter data is available. All methods of the object raise {!Netchannels.Closed_channel} if the role is not [`Filter]. *) method data_length : int (** How many bytes of the data are available. *) method data_mtime : float (** The data last modification time, expressed as an integer number of seconds since the epoch (January 1, 1970 UTC). *) end val run : ?config:config -> ?allow:(Unix.sockaddr -> bool) -> ?output_type:output_type -> ?arg_store:arg_store -> ?exn_handler:exn_handler -> ?sockaddr:Unix.sockaddr -> ?port:int -> (cgi -> unit) -> unit (** [run f] register the function [f] as a main function of the script. Each call to the script will execute [f cgi]. The code outside [f] will be executed only once (when the script is loaded into memory) which allows to cache database connections, etc. @param config Default: {!Netcgi.default_config} @param allow Tells whether a connection from the socket is allowed. Default: Use the comma separated list given in the environment variable FCGI_WEB_SERVER_ADDRS or allow all if it does not exist. @param output_type Default: [`Direct ""] @param arg_store Default: [`Automatic] for all arguments. @param exn_handler See {!Netcgi.exn_handler}. Default: delegate all exceptions to the default handler. @param sockaddr tells on what socket to contact the script. If not specified, the script expects to be launched by the web server and to communicate with it through stdin. For external scripts (launched independently of the web server and possibly on a different machine), set [sockaddr] to the address the web server needs to connect to to talk to the script (this address must also be specified in the wen server config file). @param port alternative way to specify [sockaddr] listening to localhost {b only}. If you would like your FastCGI program to be accessed from a different machine, use [sockaddr] instead. Your application should be ready handle SIGUSR1, used to resquest a "graceful" process shutdown, and SIGTERM to request a quick shutdown. *) val handle_request : config -> output_type -> arg_store -> exn_handler -> (cgi -> unit) -> max_conns:int -> log:(string -> unit) option -> Unix.file_descr -> connection_directive (** [handle_request config output_type arg_store eh f ~max_conns ~log fd]: This is a lower-level interface that processes exactly one request arriving on the existing connection [fd]. [max_conns] is passed to the FCGI client and indicates how many connections this server can process in parallel. [log] is the error logger function or [None], in which case errors are passed through to the FCGI client. The other arguments are just like for [run]. The return value indicates whether the connection can be kept open or must be closed. *)