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Module Nethttpd_plex


module Nethttpd_plex: sig .. end

Netplex support




The important function is nethttpd_factory, see below. The other functions are only needed for special effects.

An example is explained here: Example - A Simple Web Server

type config_log_error = Nethttpd_types.request_info -> string -> unit 
type config_log_access = Nethttpd_types.full_info -> unit 
type config_error_response = Nethttpd_types.error_response_params -> string 
Three type abbreviations for logging functions
val std_log_error : Netplex_types.container -> config_log_error
Returns a function that logs errors using the log_subch method of the passed container
val std_log_access : ?debug:bool -> Netplex_types.container -> config_log_access
Returns a function that logs accesses using the log_subch method of the passed container

If debug is set, additional debug log messages are printed that dump the whole access (incl. header and all available information)

val std_error_response : config_error_response
A sample error response function
val restrict_file_service_config : Netplex_types.config_file -> Netplex_types.address -> unit
Restricts the subsections and paremeters in the service configuration section of type "file" to the allowed ones.
val read_file_service_config : Netplex_types.config_file ->
Netplex_types.address -> string -> Nethttpd_services.file_service
read_file_service_config cfg addr uri_path: Reads the service configuration section of type "file" from config file cfg at address addr. uri_path is the default value put into the file_uri component of the returned record if no "uri" configuration parameter exists. (In other words, this is the path of the enclosing "uri" section, or "/" if there is only a "host" section.) All other parameters are only taken from the configuration section.

See below at nethttpd_factory how a file service needs to be configured.

val restrict_dynamic_service_config : Netplex_types.config_file -> Netplex_types.address -> unit
Restricts the subsections and paremeters in the service configuration section of type "dynamic" to the allowed ones.
val read_dynamic_service_config : (string *
(Netplex_types.config_file ->
Netplex_types.address ->
string -> (#Netcgi.cgi_activation as 'a) Nethttpd_services.dynamic_service))
list ->
Netplex_types.config_file ->
Netplex_types.address -> string -> 'a Nethttpd_services.dynamic_service
read_dynamic_service_config handlers cfg addr uri_path: Reads the service configuration section of type "dynamic" from config file cfg at address addr. The alist handlers defines the available handlers. Every handler h is called like h cfg addr uri_path. uri_path is like in read_file_service_config, i.e. the path of the enclosing "uri" section, or "/" by default.

The h function has to return the dynamic service to use, which is also returned by read_dynamic_service_config.

See below at nethttpd_factory how a dynamic service needs to be configured.

val nethttpd_processor : ?hooks:Netplex_types.processor_hooks ->
(Netplex_types.container -> #Nethttpd_reactor.http_reactor_config) ->
'a Nethttpd_types.http_service -> Netplex_types.processor
netplex_processor mk_config http_service: Creates a Netplex processor for Nethttpd.

mk_config determines the nethttpd config for a container. This is especially useful for setting the logging functions.

The resulting processor must be turned into a full Netplex service by Netplex_sockserv.create_socket_service which can then be added by calling the controller's method add_service.

hooks: One can pass a Netplex hook object to set the hooks of the processor.

type (#Netcgi.cgi_activation
, [ `Dynamic_service of
(#Netcgi.cgi_activation as 'a) Nethttpd_services.dynamic_service
| `File_service of Nethttpd_services.file_service ])
service_factory = (string * 'a Nethttpd_services.dynamic_service) list ->
Netplex_types.config_file ->
Netplex_types.address ->
string ->
[ `Dynamic_service of 'a Nethttpd_services.dynamic_service
| `File_service of Nethttpd_services.file_service ]
Nethttpd_types.http_service
The service factory function is called when a service configuration section of a certain type needs to be read. The function has args handlers, cfg, addr, and uri_path. It needs to return the http_service.

Such a function is usually read_file_service_config, or read_dynamic_service_config, or a derivative, whose return value is turned into a http_service. This can be done with Nethttpd_services.file_service and Nethttpd_services.dynamic_service.

val default_services : (string *
(#Netcgi.cgi_activation as 'a,
[ `Dynamic_service of 'a Nethttpd_services.dynamic_service
| `File_service of Nethttpd_services.file_service ])
service_factory)
list
The default services
val nethttpd_factory : ?name:string ->
?hooks:Netplex_types.processor_hooks ->
?config_cgi:Netcgi.config ->
?handlers:(string *
(#Netcgi.cgi_activation as 'a) Nethttpd_services.dynamic_service)
list ->
?services:(string *
('a,
[ `Dynamic_service of 'a Nethttpd_services.dynamic_service
| `File_service of Nethttpd_services.file_service ])
service_factory)
list ->
?log_error:(Netplex_types.container -> config_log_error) ->
?log_access:(?debug:bool ->
Netplex_types.container -> config_log_access) ->
?error_response:config_error_response ->
unit -> Netplex_types.processor_factory
Factory for a web server component.

Configuration file. Reads a configuration section like

    processor {
      type = "nethttpd";          (* or what is passed as "name" arg *)
      timeout = 300.0;
      timeout_next_request = 15.0;
      access_log = "enabled";
      suppress_broken_pipe = true;
      host {
        pref_name = "myhost";     (* optional *)
        pref_port = 80;           (* optional *)
        names = "myhost:80 yourhost:81";  (* use *:0 for any name *)
        uri {
          path = "/the/path";
          method {
            allow = "GET POST";
            (* or: deny = "..." *)
            service {
              type = "...";
              ...
            }
          }
        }
        uri {
          ...
        }
      }
      host {
        ...
      }
    }
 

The access_log parameter can be set to off, enabled, or debug. The default is off. Access messages go to the "access" subchannel of the component logger. If enabled, one line is printed with the most important data. If debug is set, all access data are printed.

If suppress_broken_pipe the error "Broken pipe" is not logged in the error log. This error occurs frequently, and may be regarded as a normal condition.

The sections host, uri and method can be nested to any depth. However, on every nesting level only one of these section types must be used. For example, if a host section already contains uri subsections, it is not allowed to add method subsections. Furthermore, the outermost section must be host.

The service section may be one of (at least if the services parameter is not overridden):

    service {
      type = "file";
      docroot = "/a/path/in/the/filesystem";
      uri = "/the/uri/prefix/corresponding/to/docroot";
      media_types_file = "/etc/mime.types";
      media_type {
        type = "application/foo";
        suffix = "foo"
      }
      default_media_type = "text/plain";
      enable_gzip = true;   (* see doc in nethttpd_services.mli *)
      index_files = "index.html";
      enable_listings = true;
      hide_from_listings = "README";   (* list of PCRE regexps *)
    }
 

Note that uri is taken from the surrounding uri section (or assumed to be "/" if there is none) if omitted.

    service {
      type = "dynamic";
      handler = "name_of_handler";
    }
 

Binds the passed handler here.

Any of host, uri, and method sections may contain one or several access sections (which are AND-connected):

    access {
      type = "host";
      allow = "host1 host2 ...";
      (* or deny = "host1 host2 ..."; *)
    }
 

Other access control methods are not yet available.

The services optional argument can be used to change the service types understood. If not passed, it defaults to default_services. The default includes "file" and "dynamic".

Arguments.

  • name: The processor name. Defaults to "nethttpd". This name can be referenced by the "type" parameters in the processor section of the config file.
  • hooks: One can pass a Netplex hook object to set the hooks of the processor.
  • config_cgi: The CGI configuration to use
  • handlers: a list of handler function. These functions can be referenced from a service section in the config file where type="dynamic" (see example above). Defaults to the empty list.
  • services: A list of service handlers that can be used by service sections in the config files. Defaults to Nethttpd_plex.default_services which defines "file" and "dynamic".
  • log_error: The error logger. Defaults to Nethttpd_plex.std_log_error.
  • log_access: The access logger. Defaults to Nethttpd_plex.std_log_access.
  • error_response: a handler which is invoked to generate error responses. Defaults to Nethttpd_plex.std_error_response.

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