167 lines
5.4 KiB
Racket
167 lines
5.4 KiB
Racket
#reader(lib "docreader.ss" "scribble")
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@require["../web-server.ss"]
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@title[#:style 'toc]{Scheme Servlets}
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The @file{web-server} allows servlets to be written in Scheme. It
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provides the supporting API, described below, for the construction
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of these servlets. This API is provided by @file{servlet.ss}.
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@local-table-of-contents[]
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@; ------------------------------------------------------------
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@section[#:tag "module-servlets"]{Definition}
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A @defterm{servlet} is a module that provides the following:
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@defthing[interface-version symbol?]{
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A symbol indicating the servlet interface the servlet conforms
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to. This influences the other provided identifiers.
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}
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If @scheme[interface-version] is @scheme['v1], then the servlet
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provides:
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@defthing[timeout integer?]{
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This number is used as the @scheme[continuation-timeout] argument to
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a timeout-based continuation manager used for this servlet. (See
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@secref["timeouts.ss"].)
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}
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@defproc[(start [initial-request request?])
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response?]{
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This function is called when an instance of this servlet is started.
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The argument is the HTTP request that initiated the instance.
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}
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If @scheme[interface-version] is @scheme['v2], then the servlet
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provides:
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@defthing[manager manager?]{
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The manager for the continuations of this servlet.
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}
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@defproc[(start [initial-request request?])
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response?]{
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This function is called when an instance of this servlet is started.
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The argument is the HTTP request that initiated the instance.
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}
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@; ------------------------------------------------------------
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@section[#:tag "servlet-structs.ss"]{Contracts}
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@file{servlet/servlet-structs.ss} provides a number of contracts
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for use in servlets.
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@defthing[servlet-response? contract?]{Equivalent to @scheme[any/c].}
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@; XXX Remove callbacks
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@defproc[(xexpr/callback? [v any/c])
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boolean?]{
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Checks if @scheme[v] matches @scheme[xexpr?], except that embedded
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procedures are allowed.
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}
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@defthing[response-generator? contract?]{Equivalent to @scheme[(k-url? . -> . servlet-response?)].}
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@defthing[k-url? (any/c . -> . boolean?)]{Equivalent to @scheme[string?].}
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@defthing[url-transform? contract?]{Equivalent to @scheme[(k-url? . -> . k-url?)].}
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@defthing[expiration-handler? contract?]{Equivalent to @scheme[(or/c false/c (request? . -> . response?))].}
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@defthing[embed/url? contract?]{Equivalent to @scheme[(((request? . -> . any/c)) (expiration-handler?) . opt-> . string?)].}
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@; ------------------------------------------------------------
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@section[#:tag "request-structs.ss"]{HTTP Requests}
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@; XXX Create http sub-directory
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@file{private/request-structs.ss} provides a number of structures and functions
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related to HTTP request data structures.
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@defstruct[header ([field bytes?]
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[value bytes?])]{
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Represents a header of @scheme[field] to @scheme[value].
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}
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@defproc[(headers-assq [id bytes?] [heads (listof header?)])
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(or/c false/c header?)]{
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Returns the header with a field equal to @scheme[id] from @scheme[heads] or @scheme[#f].
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}
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@defproc[(headers-assq* [id bytes?] [heads (listof header?)])
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(or/c false/c header?)]{
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Returns the header with a field case-insensitively equal to @scheme[id] from @scheme[heads] or @scheme[#f].
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}
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@defstruct[binding ([id bytes?])]{Represents a binding of @scheme[id].}
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@defstruct[(binding:form binding) ([id bytes?]
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[value bytes?])]{
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Represents a form binding of @scheme[id] to @scheme[value].
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}
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@defstruct[(binding:file binding) ([id bytes?]
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[filename bytes?]
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[content bytes?])]{
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Represents the uploading of the file @scheme[filename] with the id @scheme[id]
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and the content @scheme[content].
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}
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@defproc[(bindings-assq [id bytes?] [binds (listof binding?)])
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(or/c false/c binding?)]{
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Returns the binding with an id equal to @scheme[id] from @scheme[binds] or @scheme[#f].
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}
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@; XXX Subtypes of request
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@defstruct[request ([method symbol?]
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[uri url?]
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[headers/raw (listof header?)]
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[bindings/raw (listof binding?)]
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[post-data/raw (or/c false/c bytes?)]
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[host-ip string?]
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[host-port number?]
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[client-ip string?])]{
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An HTTP @scheme[method] request to @scheme[uri] from @scheme[client-ip]
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to the server at @scheme[host-ip]:@scheme[host-port] with @scheme[headers/raw]
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headers, @scheme[bindings/raw] GET and POST queries and @scheme[post-data/raw]
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POST data.
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}
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@; ------------------------------------------------------------
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@section[#:tag "bindings.ss"]{Request Bindings}
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XXX
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@; ------------------------------------------------------------
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@section[#:tag "response-structs.ss"]{HTTP Responses}
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XXX
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@; ------------------------------------------------------------
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@section[#:tag "web.ss"]{Web}
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XXX
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@; ------------------------------------------------------------
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@section[#:tag "helpers.ss"]{Helpers}
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XXX
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@; XXX Depreciate
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@; ------------------------------------------------------------
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@section[#:tag "servlet-url.ss"]{Servlet URLs}
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XXX
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@; ------------------------------------------------------------
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@section[#:tag "basic-auth.ss"]{Basic Authentication}
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XXX
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@; ------------------------------------------------------------
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@section[#:tag "web-cells.ss"]{Web Cells}
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XXX
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