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40 lines
1.3 KiB
Haskell
40 lines
1.3 KiB
Haskell
module Hasql.Settings where
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import Hasql.Prelude
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import qualified Data.ByteString as B
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import qualified Data.ByteString.Lazy.Builder as BB
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import qualified Data.ByteString.Lazy.Builder.ASCII as BB
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import qualified Data.ByteString.Lazy as BL
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-- |
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-- All settings encoded in a single byte-string according to
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-- <http://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNSTRING the PostgreSQL format>.
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type Settings =
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ByteString
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-- |
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-- Encode a host, a port, a user, a password and a database into the PostgreSQL settings byte-string.
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{-# INLINE settings #-}
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settings :: ByteString -> Word16 -> ByteString -> ByteString -> ByteString -> Settings
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settings host port user password database =
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BL.toStrict $ BB.toLazyByteString $ mconcat $ intersperse (BB.char7 ' ') $ catMaybes $
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[
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mappend (BB.string7 "host=") . BB.byteString <$>
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mfilter (not . B.null) (pure host)
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,
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mappend (BB.string7 "port=") . BB.word16Dec <$>
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mfilter (/= 0) (pure port)
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,
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mappend (BB.string7 "user=") . BB.byteString <$>
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mfilter (not . B.null) (pure user)
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,
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mappend (BB.string7 "password=") . BB.byteString <$>
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mfilter (not . B.null) (pure password)
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,
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mappend (BB.string7 "dbname=") . BB.byteString <$>
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mfilter (not . B.null) (pure database)
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]
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