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(.module:
[library
[lux #*
[abstract
[monad (#+ do)]]
[control
[io (#+ IO)]
["." try (#+ Try)]
[concurrency
["." async (#+ Async)]
["." stm]]]
[data
[binary (#+ Binary)]]
[world
[net
[uri (#+ URI)]]]]])
(type: .public (Repository !)
(Interface
(: Text
description)
(: (-> URI (! (Try Binary)))
download)
(: (-> URI Binary (! (Try Any)))
upload)))
(def: .public (async repository)
(-> (Repository IO) (Repository Async))
(implementation
(def: description
(\ repository description))
(def: (download uri)
(async.future (\ repository download uri)))
(def: (upload uri content)
(async.future (\ repository upload uri content)))
))
(type: .public (Mock s)
(Interface
(: Text
the_description)
(: (-> URI s (Try [s Binary]))
on_download)
(: (-> URI Binary s (Try s))
on_upload)))
(def: .public (mock mock init)
(All (_ s) (-> (Mock s) s (Repository Async)))
(let [state (stm.var init)]
(implementation
(def: description
(\ mock the_description))
(def: (download uri)
(stm.commit!
(do {! stm.monad}
[|state| (stm.read state)]
(case (\ mock on_download uri |state|)
(#try.Success [|state| output])
(do !
[_ (stm.write |state| state)]
(in (#try.Success output)))
(#try.Failure error)
(in (#try.Failure error))))))
(def: (upload uri content)
(stm.commit!
(do {! stm.monad}
[|state| (stm.read state)]
(case (\ mock on_upload uri content |state|)
(#try.Success |state|)
(do !
[_ (stm.write |state| state)]
(in (#try.Success [])))
(#try.Failure error)
(in (#try.Failure error))))))
)))
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