71 lines
2.2 KiB
Factor
71 lines
2.2 KiB
Factor
! Copyright (C) 2004 Chris Double.
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! Copyright (C) 2006 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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IN: callback-responder
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USING: hashtables html http httpd io kernel math namespaces
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sequences ;
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: expiry-timeout ( -- ms ) 900 1000 * ;
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: get-random-id ( -- id )
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#! Generate a random id to use for continuation URL's
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[ "ID" % 32 [ 9 random-int CHAR: 0 + , ] times ] "" make ;
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: callback-table ( -- <hashtable> )
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#! Return the global table of continuations
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\ callback-table get-global ;
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: reset-callback-table ( -- )
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#! Create the initial global table
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H{ } clone \ callback-table set-global ;
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reset-callback-table
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#! Tuple for holding data related to a callback.
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TUPLE: item quot expire? id time-added ;
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C: item ( quot expire? id -- item )
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millis over set-item-time-added
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[ set-item-id ] keep
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[ set-item-expire? ] keep
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[ set-item-quot ] keep ;
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: expired? ( item -- ? )
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#! Return true if the callback item is expirable
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#! and has expired (ie. was added to the table more than
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#! timeout milliseconds ago).
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[ item-time-added expiry-timeout + millis < ] keep
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item-expire? and ;
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: expire-callbacks ( -- )
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#! Expire all continuations in the continuation table
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#! if they are 'timeout-seconds' old (ie. were added
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#! more than 'timeout-seconds' ago.
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callback-table clone [
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expired? [ callback-table remove-hash ] [ drop ] if
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] hash-each ;
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: id>url ( id -- string )
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#! Convert the continuation id to an URL suitable for
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#! embedding in an HREF or other HTML.
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"/responder/callback/?id=" swap url-encode append ;
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: register-callback ( quot expire? -- url )
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#! Store a continuation in the table and associate it with
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#! a random id. That continuation will be expired after
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#! a certain period of time if 'expire?' is true.
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get-random-id [ <item> ] keep
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[ callback-table set-hash ] keep
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id>url ;
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: register-html-callback ( quot expire? -- url )
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>r [ serving-html ] swap append r> register-callback ;
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: callback-responder ( -- )
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expire-callbacks
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"id" query-param callback-table hash [
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item-quot call
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] [
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"404 Callback not available" httpd-error
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] if* ;
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