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(.module:
[lux #*
[abstract
[monad (#+ do)]]
[control
[io (#+ IO)]
["." try (#+ Try)]
[concurrency
["." promise (#+ Promise)]
["." stm]]]
[data
[binary (#+ Binary)]]
[world
[net
[uri (#+ URI)]]]])
(signature: #export (Repository !)
(: (-> URI (! (Try Binary)))
download)
(: (-> URI Binary (! (Try Any)))
upload))
(def: #export (async repository)
(-> (Repository IO) (Repository Promise))
(structure
(def: (download uri)
(promise.future (\ repository download uri)))
(def: (upload uri content)
(promise.future (\ repository upload uri content)))
))
(signature: #export (Simulation s)
(: (-> URI s (Try [s Binary]))
on_download)
(: (-> URI Binary s (Try s))
on_upload))
(def: #export (mock simulation init)
(All [s] (-> (Simulation s) s (Repository Promise)))
(let [state (stm.var init)]
(structure
(def: (download uri)
(stm.commit
(do {! stm.monad}
[|state| (stm.read state)]
(case (\ simulation on_download uri |state|)
(#try.Success [|state| output])
(do !
[_ (stm.write |state| state)]
(wrap (#try.Success output)))
(#try.Failure error)
(wrap (#try.Failure error))))))
(def: (upload uri content)
(stm.commit
(do {! stm.monad}
[|state| (stm.read state)]
(case (\ simulation on_upload uri content |state|)
(#try.Success |state|)
(do !
[_ (stm.write |state| state)]
(wrap (#try.Success [])))
(#try.Failure error)
(wrap (#try.Failure error))))))
)))
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