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(local {: must} (require :lib.utils))
(fn get [db key else]
(local result
(must (luna.db.query db "SELECT value FROM cache WHERE key = ?"
[key])))
(or (if (and result (< 0 (# result)))
(. (. result 1) 1)
nil)
else))
(fn _set [db key value]
value
(must (luna.db.exec db "INSERT OR REPLACE INTO cache VALUES (?, ?)"
[key value]))
value)
(fn clear [db prefix]
(if (= "string" (type prefix))
(must (luna.db.exec db "DELETE FROM cache WHERE key LIKE ?"
[(.. prefix "%")]))
(must (luna.db.exec db"DELETE FROM cache" []))))
(fn wrap [db key f]
(local cached (get db key))
(if cached
cached
(let [res (f)]
(if res (_set db key res) nil))))
{:get get :set _set :clear clear :wrap wrap}
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