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(.module:
[lux (#- and int)
[control
[functor (#+ Functor)]
[apply (#+ Apply)]
[monad (#+ Monad do)]
["ex" exception]
[concurrency
["." promise (#+ Promise) ("promise/." monad)]]
[security
["!" capability (#+ capability:)]]]
[data
["." product]
["." error (#+ Error)]
[text
format]
[collection
[list ("list/." fold)]]]
["." io (#+ IO)]
[world
[net (#+ URL)]]
[host (#+ import:)]]
[//
["." sql]]
[/
["/." input (#+ Input)]
["/." output (#+ Output)]])
(import: #long java/sql/ResultSet
(getRow [] #try int)
(next [] #try boolean)
(close [] #io #try void))
(import: #long java/sql/Statement
(#static NO_GENERATED_KEYS int)
(#static RETURN_GENERATED_KEYS int)
(getGeneratedKeys [] #try java/sql/ResultSet)
(close [] #io #try void))
(import: #long java/sql/PreparedStatement
(executeUpdate [] #io #try int)
(executeQuery [] #io #try java/sql/ResultSet))
(import: #long java/sql/Connection
(prepareStatement [String int] #try java/sql/PreparedStatement)
(isValid [int] #try boolean)
(close [] #io #try void))
(import: #long java/sql/DriverManager
(#static getConnection [String String String] #io #try java/sql/Connection))
(type: #export Credentials
{#url URL
#user Text
#password Text})
(type: #export ID Int)
(type: #export (Statement input)
{#sql sql.Statement
#input (Input input)
#value input})
(do-template [<name> <forge> <output>]
[(capability: #export (<name> ! i)
(<forge> (Statement i) (! (Error <output>))))]
[Can-Execute can-execute Nat]
[Can-Insert can-insert (List ID)]
)
(capability: #export (Can-Query ! i o)
(can-query [(Statement i) (Output o)] (! (Error (List o)))))
(capability: #export (Can-Close !)
(can-close Any (! (Error Any))))
(signature: #export (DB !)
(: (Can-Execute !)
execute)
(: (Can-Insert !)
insert)
(: (Can-Query !)
query)
(: (Can-Close !)
close))
(def: (with-statement statement conn action)
(All [i a]
(-> (Statement i) java/sql/Connection
(-> java/sql/PreparedStatement (IO (Error a)))
(IO (Error a))))
(do (error.with-error io.monad)
[prepared (io.io (java/sql/Connection::prepareStatement (sql.sql (get@ #sql statement))
(java/sql/Statement::RETURN_GENERATED_KEYS)
conn))
_ (io.io ((get@ #input statement) (get@ #value statement) [1 prepared]))
result (action prepared)
_ (java/sql/Statement::close prepared)]
(wrap result)))
(def: #export (async db)
(-> (DB IO) (DB Promise))
(`` (structure
(~~ (do-template [<name> <forge>]
[(def: <name> (<forge> (|>> (!.use (:: db <name>)) promise.future)))]
[execute can-execute]
[insert can-insert]
[close can-close]
[query can-query])))))
(def: #export (connect creds)
(-> Credentials (IO (Error (DB IO))))
(do (error.with-error io.monad)
[connection (java/sql/DriverManager::getConnection (get@ #url creds)
(get@ #user creds)
(get@ #password creds))]
(wrap (: (DB IO)
(structure
(def: execute
(..can-execute
(function (execute statement)
(with-statement statement connection
(function (_ prepared)
(do (error.with-error io.monad)
[row-count (java/sql/PreparedStatement::executeUpdate prepared)]
(wrap (.nat row-count))))))))
(def: insert
(..can-insert
(function (insert statement)
(with-statement statement connection
(function (_ prepared)
(do (error.with-error io.monad)
[_ (java/sql/PreparedStatement::executeUpdate prepared)
result-set (io.io (java/sql/Statement::getGeneratedKeys prepared))]
(/output.rows /output.long result-set)))))))
(def: close
(..can-close
(function (close _)
(java/sql/Connection::close connection))))
(def: query
(..can-query
(function (query [statement output])
(with-statement statement connection
(function (_ prepared)
(do (error.with-error io.monad)
[result-set (java/sql/PreparedStatement::executeQuery prepared)]
(/output.rows output result-set)))))))
)))))
(def: #export (with-db creds action)
(All [a]
(-> Credentials
(-> (DB IO) (IO (Error a)))
(IO (Error a))))
(do (error.with-error io.monad)
[db (..connect creds)
result (action db)
_ (!.use (:: db close) [])]
(wrap result)))
(def: #export (with-async-db creds action)
(All [a]
(-> Credentials
(-> (DB Promise) (Promise (Error a)))
(Promise (Error a))))
(do (error.with-error promise.monad)
[db (promise.future (..connect creds))
result (action (..async db))
_ (promise/wrap (io.run (!.use (:: db close) [])))]
(wrap result)))
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