resto-directory 0.9 · OCaml Package

Parameters

module Encoding : Resto.ENCODING

Signature

module Service : module type of struct include Resto.MakeService(Encoding) end

type step =

| Static of string
(*
A literal chunk
*)
| Dynamic of Resto.Arg.descr
(*
A chunk which describes a argument to a service
*)
| DynamicTail of Resto.Arg.descr
(*
The remainder of the chunks are to be interpreted as a list of arguments
*)

The different chunks of a path

E.g., /archive/<year>/<months>/ has a Static "archive" step followed by a Dynamic _ step followed by a Dynamic _ step. Each Dynamic _ step has an Resto.Arg payload describing the chunk.

type conflict =

| CService of Resto.meth
| CDir
| CBuilder
| CTail
| CTypes of Resto.Arg.descr * Resto.Arg.descr
| CType of Resto.Arg.descr * string list

Possible error while registring services.

exception Conflict of step list * conflict

type ('query, 'input, 'output, 'error) types = {

query : 'query Resto.Query.t;
input : 'input Service.input;
output : 'output Encoding.t;
error : 'error Encoding.t;

}

type registered_service =

| Service : {
1. types : ('q, 'i, 'o, 'e) types;
2. handler : 'q -> 'i -> ('o, 'e) Answer.t Lwt.t;
} -> registered_service

type 'prefix t

Dispatch tree

type 'prefix directory = 'prefix t

type lookup_error = [

| `Not_found
| `Method_not_allowed of Resto.meth list
| `Cannot_parse_path of string list * Resto.Arg.descr * string

]

val string_of_step : step -> string

string_of_step step converts the given steps into a string.

val string_of_conflict_kind : conflict -> string

string_of_conflict_kind conflict_kind converts the given conflict_kind into a string.

val string_of_conflict : (step list * conflict) -> string

string_of_conflict conflict converts the given conflict into a string.

val lookup : 
  'prefix directory ->
  'prefix ->
  Resto.meth ->
  string list ->
  (registered_service, [> lookup_error ]) Stdlib.result Lwt.t

lookup d m p is Ok (Service _) if there is a service s registered in d and both the method of s is m and the path of s matches p. It is Error _ otherwise.

If it is Ok (Service _) then the returned value corresponds to the registered service.

val lookup_uri_desc : 
  'prefix directory ->
  'prefix ->
  Resto.meth ->
  string list ->
  (string, [> lookup_error ]) Stdlib.result Lwt.t

lookup_uri_desc d p is Ok u where u is a formated URI description, if there is a service s registered in d and the path of s matches p. It is Error _ otherwise.

For instance, given the following path p: "/entries-by-date/2022/01/10" where "2022", "01", and "10" are expected to be paramaters in the path of s, the function will evaluate in "/entries-by-date/<year>/<month>/<day>".

val allowed_methods : 
  'prefix directory ->
  'prefix ->
  string list ->
  (Resto.meth list, [> lookup_error ]) Stdlib.result Lwt.t

allowed_methods d p is the set of methods m such that lookup d m p is Ok _. In other words, it is the set of methods m such that a service has been registered in d for a path that matches p.

val transparent_lookup : 
  'prefix directory ->
  ('meth, 'prefix, 'params, 'query, 'input, 'output, 'error) Service.t ->
  'params ->
  'query ->
  'input ->
  [> ('output, 'error) Answer.t ] Lwt.t

val empty : 'prefix directory

Empty tree

val map : ('a -> 'b Lwt.t) -> 'b directory -> 'a directory

val prefix : ('pr, 'p) Resto.Path.path -> 'p directory -> 'pr directory

prefix p d is a directory of services which includes a service registered on the path p / q for each service registered on the path q in d.

raises [Invalid_argument]
if p is a dynamic path.

val merge : 
  ?strategy:[ `Raise | `Pick_left | `Pick_right ] ->
  'a directory ->
  'a directory ->
  'a directory

merge ~strategy d1 d2 is a directory which includes all the services of d1 and d2.

If one or more service from d1 collides with one or more service from d2, the function will make a choice depending on the given merging strategy:

`Raise will raise a Conflict exception. This is the default choice.
`Pick_left will pick the service from d1 to be part of the resulting directory.
`Pick_right will pick the service from d2 to be part of the resulting directory.

Be careful, this function is only capable to merge static directory trees. If a subtree of one of the given directory is dynamic, the function will raise a Conflict exception.

raises [Conflict]
if:
- One or more service from d1 collides with one or more service from d2 and the merging strategy is `Raise or unspecified.
- A Dynamic or DynamicTail directory can be found in d1 or d2 directories.
- Sub-directories can't be merged because of a structural conflict. For instance, if a path leads from d1 to a sub-directory d1' that is an URI parameter, but path also leads from d2 to a sub-directory d2' that is only a static segment of the URI.

val register : 
  'prefix directory ->
  ('meth, 'prefix, 'params, 'query, 'input, 'output, 'error) Service.t ->
  ('params -> 'query -> 'input -> [< ('output, 'error) Answer.t ] Lwt.t) ->
  'prefix directory

register d s h is a directory that contains all the services registered in d plus the service s. Requests to the service s are handled by the handler h.

val register0 : 
  unit directory ->
  ('m, unit, unit, 'q, 'i, 'o, 'e) Service.t ->
  ('q -> 'i -> [< ('o, 'e) Answer.t ] Lwt.t) ->
  unit directory

Registring handler in service tree. Curryfied variant.

val register1 : 
  'prefix directory ->
  ('m, 'prefix, unit * 'a, 'q, 'i, 'o, 'e) Service.t ->
  ('a -> 'q -> 'i -> [< ('o, 'e) Answer.t ] Lwt.t) ->
  'prefix directory

val register2 : 
  'prefix directory ->
  ('m, 'prefix, (unit * 'a) * 'b, 'q, 'i, 'o, 'e) Service.t ->
  ('a -> 'b -> 'q -> 'i -> [< ('o, 'e) Answer.t ] Lwt.t) ->
  'prefix directory

val register3 : 
  'prefix directory ->
  ('m, 'prefix, ((unit * 'a) * 'b) * 'c, 'q, 'i, 'o, 'e) Service.t ->
  ('a -> 'b -> 'c -> 'q -> 'i -> [< ('o, 'e) Answer.t ] Lwt.t) ->
  'prefix directory

val register4 : 
  'prefix directory ->
  ('m, 'prefix, (((unit * 'a) * 'b) * 'c) * 'd, 'q, 'i, 'o, 'e) Service.t ->
  ('a -> 'b -> 'c -> 'd -> 'q -> 'i -> [< ('o, 'e) Answer.t ] Lwt.t) ->
  'prefix directory

val register5 : 
  'prefix directory ->
  ('m, 'prefix, ((((unit * 'a) * 'b) * 'c) * 'd) * 'f, 'q, 'i, 'o, 'e)
    Service.t ->
  ('a -> 'b -> 'c -> 'd -> 'f -> 'q -> 'i -> [< ('o, 'e) Answer.t ] Lwt.t) ->
  'prefix directory

val register_dynamic_directory : 
  ?descr:string ->
  'prefix directory ->
  ('prefix, 'a) Resto.Path.path ->
  ('a -> 'a directory Lwt.t) ->
  'prefix directory

Registring dynamic subtree.

val register_dynamic_directory1 : 
  ?descr:string ->
  'prefix directory ->
  ('prefix, unit * 'a) Resto.Path.path ->
  ('a -> (unit * 'a) directory Lwt.t) ->
  'prefix directory

Registring dynamic subtree. (Curryfied variant)

val register_dynamic_directory2 : 
  ?descr:string ->
  'prefix directory ->
  ('prefix, (unit * 'a) * 'b) Resto.Path.path ->
  ('a -> 'b -> ((unit * 'a) * 'b) directory Lwt.t) ->
  'prefix directory

val register_dynamic_directory3 : 
  ?descr:string ->
  'prefix directory ->
  ('prefix, ((unit * 'a) * 'b) * 'c) Resto.Path.path ->
  ('a -> 'b -> 'c -> (((unit * 'a) * 'b) * 'c) directory Lwt.t) ->
  'prefix directory

val register_describe_directory_service : 
  'prefix directory ->
  ('prefix, 'prefix, 'error) Service.description_service ->
  'prefix directory

Registring a description service.

val describe_directory : 
  recurse:bool ->
  ?arg:'a ->
  'a directory ->
  Encoding.schema Resto.Description.directory Lwt.t

package resto-directory

Parameters

Signature