Module Eliom_services

module Eliom_services: sig..end

This module allows to define services.

val sync : ('a -> 'b -> 'c -> 'd) -> 'a -> 'b -> 'c -> 'd Lwt.t

This function may be used for services that cannot be interrupted (no cooperation point for threads). It is defined by let sync f sp g p = Lwt.return (f sp g p)

type cookie =

\|	Set of Ocsigen_extensions.url_path option * float option * string * string
\|	Unset of Ocsigen_extensions.url_path option * string

Type used for other cookies to set or unset. The float option is the timestamp for the expiration date. The strings are names and values.

val cookie_table_of_eliom_cookies :
   ?oldtable:Ocsigen_http_frame.cookieset ->
    sp:Eliom_sessions.server_params ->
    cookie list -> Ocsigen_http_frame.cookieset

Conversion fonction from Eliom cookies to server cookies. If ?oldtable is present, cookies are added to this table

type result_to_send =

\|	EliomResult of Ocsigen_http_frame.result
\|	EliomExn of (exn list * cookie list)

The type to send if you want to create your own modules for generating pages

Types of services ¶

type suff = [ `WithSuffix | `WithoutSuffix ]

type servcoserv = [ `Coservice | `Service ]

type getpost = [ `Get | `Post ]

type attached_service_kind = [ `External | `Internal of servcoserv * getpost ]

type get_attached_service_kind = [ `External | `Internal of servcoserv * [ `Get ] ]

type post_attached_service_kind = [ `External | `Internal of servcoserv * [ `Post ] ]

type internal = [ `Internal of servcoserv * getpost ]

type registrable = [ `Registrable | `Unregistrable ]

You can call register function only on registrable services

type +'a a_s

type +'a na_s

type service_kind =
[ `Attached of attached_service_kind a_s
| `Nonattached of getpost na_s ]

type get_service_kind =
[ `Attached of get_attached_service_kind a_s
| `Nonattached of [ `Get ] na_s ]

type post_service_kind =
[ `Attached of post_attached_service_kind a_s
| `Nonattached of [ `Post ] na_s ]

type internal_service_kind =
[ `Attached of internal a_s
| `Nonattached of getpost na_s ]

type attached = [ `Attached of attached_service_kind a_s ]

type nonattached = [ `Nonattached of getpost na_s ]

type ('a, 'b, +'c, +'d, +'e, +'f, +'g) service

Type of services.* 'get is the type of GET parameters

'post is the type of POST parameters
'kind is a subtype of Eliom_services.service_kind (attached or non-attached service, internal or external, GET only or with POST parameters)
'tipo is a phantom type stating the kind of parameters it uses (suffix or not)
'getnames is the type of GET parameters names
'postnames is the type of POST parameters names
'registrable is a phantom type, subtype of Eliom_services.registrable, telling if it is possible to register a handler on this service.

Definitions of services ¶

Main services ¶

val new_service :
   ?sp:Eliom_sessions.server_params ->
    path:Ocsigen_extensions.url_path ->
    get_params:('a, [< suff ] as 'b, 'c)
    Eliom_parameters.params_type ->
    unit ->
    ('a, unit,
    [> `Attached of
    [> `Internal of [> `Service ] * [> `Get ] ] a_s ],
    'b, 'c, unit, [> `Registrable ])
    service

new_service ~path:p ~get_params:pa () creates an Eliom_services.service associated to the path p, taking the GET parameters pa.

Warning: If you use this function after the initialisation phase, you must give the ~sp parameter, otherwise it will raise the exception Eliom_common.Eliom_function_forbidden_outside_site_loading.

val new_service' :
   ?sp:Eliom_sessions.server_params ->
    name:string ->
    get_params:('a, [ `WithoutSuffix ], 'b) Eliom_parameters.params_type ->
    unit ->
    ('a, unit, [> `Nonattached of [> `Get ] na_s ],
    [ `WithoutSuffix ], 'b, unit, [> `Registrable ])
    service

new_service' ~name:n ~get_params:pa () creates a non-attached service associated to the name n, taking the GET parameters pa.

Warning: If you use this function after the initialisation phase, you must give the ~sp parameter, otherwise it will raise the exception Eliom_common.Eliom_function_forbidden_outside_site_loading.

val new_external_service :
   prefix:string ->
    path:Ocsigen_extensions.url_path ->
    get_params:('a, [< suff ] as 'b, 'c)
    Eliom_parameters.params_type ->
    post_params:('d, [ `WithoutSuffix ], 'e) Eliom_parameters.params_type ->
    unit ->
    ('a, 'd, [> `Attached of [> `External ] a_s ], 'b, 'c, 'e,
    [> `Unregistrable ])
    service

Creates an service for an external web site. Allows to creates links or forms towards other Web sites using Eliom's syntax.

The parameter labelled ~path is the URL path, and each element of the list will be URL-encoded.

The parameter labelled ~prefix contains all what you want to put before the path. It usually starts with "http://" plus the name of the server. The whole URL is constructed from the prefix, the path and parameters. The prefix is not encoded. An empty prefix can be used to make a link to another site of the same server.

val new_post_service :
   ?sp:Eliom_sessions.server_params ->
    fallback:('a, unit,
    [ `Attached of
    [ `Internal of [ `Coservice | `Service ] * [ `Get ] ]
    a_s ],
    [< suff ] as 'b, 'c, unit, [< `Registrable ])
    service ->
    post_params:('d, [ `WithoutSuffix ], 'e) Eliom_parameters.params_type ->
    unit ->
    ('a, 'd,
    [> `Attached of
    [> `Internal of [ `Coservice | `Service ] * [> `Post ] ]
    a_s ],
    'b, 'c, 'e, [> `Registrable ])
    service

Creates an service that takes POST parameters. fallback is the a service without POST parameters. You can't create an service with POST parameters if the same service does not exist without POST parameters. Thus, the user can't bookmark a page that does not exist.

val new_post_service' :
   ?keep_get_na_params:bool ->
    name:string ->
    post_params:('a, [ `WithoutSuffix ], 'b) Eliom_parameters.params_type ->
    unit ->
    (unit, 'a, [> `Nonattached of [> `Post ] na_s ],
    [ `WithoutSuffix ], unit, 'b, [> `Registrable ])
    service

Creates a non-attached service that takes POST parameters. name is the name of that non-attached service.

Attached coservices ¶

val new_coservice :
   ?max_use:int ->
    ?timeout:float ->
    fallback:(unit, unit,
    [ `Attached of
    [ `Internal of [ `Service ] * [ `Get ] ] a_s ],
    [ `WithoutSuffix ], unit, unit, [< registrable ])
    service ->
    get_params:('a, [ `WithoutSuffix ], 'b) Eliom_parameters.params_type ->
    unit ->
    ('a, unit,
    [> `Attached of
    [> `Internal of [> `Coservice ] * [> `Get ] ] a_s ],
    [ `WithoutSuffix ], 'b, unit, [> `Registrable ])
    service

Creates a coservice. A coservice is another version of an already existing main service, where you can register another handler. The two versions are automatically distinguished using an extra parameter added automatically by Eliom. It allows to have several links towards the same page, that will behave differently, or to create services dedicated to one user. See the tutorial for more informations.

val new_post_coservice :
   ?max_use:int ->
    ?timeout:float ->
    fallback:('a, unit,
    [ `Attached of
    [ `Internal of [< `Coservice | `Service ] * [ `Get ] ]
    a_s ],
    [< suff ] as 'b, 'c, unit, [< `Registrable ])
    service ->
    post_params:('d, [ `WithoutSuffix ], 'e) Eliom_parameters.params_type ->
    unit ->
    ('a, 'd,
    [> `Attached of
    [> `Internal of [> `Coservice ] * [> `Post ] ] a_s ],
    'b, 'c, 'e, [> `Registrable ])
    service

Creates a coservice with POST parameters

Non attached coservices ¶

val new_coservice' :
   ?max_use:int ->
    ?timeout:float ->
    get_params:('a, [ `WithoutSuffix ], 'b) Eliom_parameters.params_type ->
    unit ->
    ('a, unit, [> `Nonattached of [> `Get ] na_s ],
    [ `WithoutSuffix ], 'b, unit, [> `Registrable ])
    service

Creates a non-attached coservice, that is, services that do not correspond to a precise URL. Links towards such services will not change the URL, just add extra parameters. See the tutorial for more informations.

val new_post_coservice' :
   ?max_use:int ->
    ?timeout:float ->
    ?keep_get_na_params:bool ->
    post_params:('a, [ `WithoutSuffix ], 'b) Eliom_parameters.params_type ->
    unit ->
    (unit, 'a, [> `Nonattached of [> `Post ] na_s ],
    [ `WithoutSuffix ], unit, 'b, [> `Registrable ])
    service

Creates a non attached coservice with POST parameters. If the optional parameter ~keep_get_na_params is false, GET non-attached parameters won't be kept in the URL (if any) when you create a POST form to this coservice. Default is true. See also Eliom_mkforms.ELIOMFORMSIG.post_form.

Misc ¶

val static_dir :
   sp:Eliom_sessions.server_params ->
    (string list, unit,
    [> `Attached of
    [> `Internal of [> `Service ] * [> `Get ] ] a_s ],
    [ `WithSuffix ], [ `One of string list ] Eliom_parameters.param_name,
    unit, [> `Unregistrable ])
    service

A predefined service that correponds to the directory where static pages are. This directory is chosen in the config file (ocsigen.conf). This service takes the name of the static file as a parameter (a string list, slash separated).

val preapply :
   service:('a, 'b, [> `Attached of 'd a_s ] as 'c,
    [< suff ], 'e, 'f, 'g)
    service ->
    'a ->
    (unit, 'b, 'c, [ `WithoutSuffix ], unit, 'f, [> `Unregistrable ])
    service

creates a new service by preapplying a service to GET parameters. It is not possible to register a handler on an preapplied service. Preapplied services may be used in links or as fallbacks for coservices

Using your own error pages ¶

val set_exn_handler :
   ?sp:Eliom_sessions.server_params ->
    (Eliom_sessions.server_params -> exn -> result_to_send Lwt.t) ->
    unit

allows to use your own error pages (404, or any exception during page generation).

Warning: If you use this function after the initialisation phase, you must give the ~sp parameter, otherwise it will raise the exception Eliom_common.Eliom_function_forbidden_outside_site_loading.