123 lines
3.7 KiB
Factor
123 lines
3.7 KiB
Factor
! Copyright (C) 2004 Chris Double.
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! Copyright (C) 2006, 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: http http.server io kernel math namespaces
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continuations calendar sequences assocs hashtables
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accessors arrays alarms quotations combinators fry
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http.server.redirection furnace assocs.lib urls ;
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IN: furnace.callbacks
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SYMBOL: responder
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TUPLE: callback-responder responder callbacks ;
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: <callback-responder> ( responder -- responder' )
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H{ } clone callback-responder boa ;
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TUPLE: callback cont quot expires alarm responder ;
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: timeout 20 minutes ;
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: timeout-callback ( callback -- )
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[ alarm>> cancel-alarm ]
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[ dup responder>> callbacks>> delete-at ]
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bi ;
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: touch-callback ( callback -- )
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dup expires>> [
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dup alarm>> [ cancel-alarm ] when*
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dup '[ , timeout-callback ] timeout later >>alarm
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] when drop ;
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: <callback> ( cont quot expires? -- callback )
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f callback-responder get callback boa
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dup touch-callback ;
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: invoke-callback ( callback -- response )
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[ touch-callback ]
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[ quot>> request get exit-continuation get 3array ]
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[ cont>> continue-with ]
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tri ;
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: register-callback ( cont quot expires? -- id )
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<callback> callback-responder get callbacks>> set-at-unique ;
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: forward-to-url ( url -- * )
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#! When executed inside a 'show' call, this will force a
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#! HTTP 302 to occur to instruct the browser to forward to
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#! the request URL.
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<temporary-redirect> exit-with ;
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: cont-id "factorcontid" ;
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: forward-to-id ( id -- * )
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#! When executed inside a 'show' call, this will force a
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#! HTTP 302 to occur to instruct the browser to forward to
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#! the request URL.
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<url>
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swap cont-id set-query-param forward-to-url ;
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: restore-request ( pair -- )
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first3 exit-continuation set request set call ;
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SYMBOL: post-refresh-get?
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: redirect-to-here ( -- )
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#! Force a redirect to the client browser so that the browser
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#! goes to the current point in the code. This forces an URL
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#! change on the browser so that refreshing that URL will
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#! immediately run from this code point. This prevents the
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#! "this request will issue a POST" warning from the browser
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#! and prevents re-running the previous POST logic. This is
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#! known as the 'post-refresh-get' pattern.
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post-refresh-get? get [
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[
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[ ] t register-callback forward-to-id
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] callcc1 restore-request
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] [
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post-refresh-get? on
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] if ;
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SYMBOL: current-show
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: store-current-show ( -- )
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#! Store the current continuation in the variable 'current-show'
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#! so it can be returned to later by 'quot-id'. Note that it
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#! recalls itself when the continuation is called to ensure that
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#! it resets its value back to the most recent show call.
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[ current-show set f ] callcc1
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[ restore-request store-current-show ] when* ;
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: show-final ( quot -- * )
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[ redirect-to-here store-current-show ] dip
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call exit-with ; inline
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: resuming-callback ( responder request -- id )
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url>> cont-id query-param swap callbacks>> at ;
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M: callback-responder call-responder* ( path responder -- response )
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'[
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, ,
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[ callback-responder set ]
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[ request get resuming-callback ] bi
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[
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invoke-callback
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] [
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callback-responder get responder>> call-responder
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] ?if
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] with-exit-continuation ;
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: show-page ( quot -- )
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[ redirect-to-here store-current-show ] dip
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[
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[ ] t register-callback swap call exit-with
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] callcc1 restore-request ; inline
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: quot-id ( quot -- id )
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current-show get swap t register-callback ;
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: quot-url ( quot -- url )
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quot-id f swap cont-id associate derive-url ;
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