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Add
connectdbParams and other connection key-value functions
Added a `Storable` instance for an equivalent to `PQconninfoOption` and bindings for the functions that use the struct: - PQconnectdbParams - PQconndefaults - PQconninfo - PQconninfoParse - PQconninfoFree Also added some wrappers which do a minimum of conversion to `ByteString`s and make sure memory isn't leaked.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| {-# LANGUAGE OverloadedStrings #-} | ||
| {-# LANGUAGE RecordWildCards #-} | ||
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| module Database.PostgreSQL.LibPQ.Connect where | ||
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| #include "hs-libpq.h" | ||
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| import Foreign (Storable (..), nullPtr) | ||
| import Foreign.C (CInt) | ||
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| import qualified Data.ByteString as B | ||
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| ------------------------------------------------------------------------------- | ||
| -- ConninfoOption | ||
| ------------------------------------------------------------------------------- | ||
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| -- typedef struct | ||
| -- { | ||
| -- char *keyword; /* The keyword of the option */ | ||
| -- char *envvar; /* Fallback environment variable name */ | ||
| -- char *compiled; /* Fallback compiled in default value */ | ||
| -- char *val; /* Option's current value, or NULL */ | ||
| -- char *label; /* Label for field in connect dialog */ | ||
| -- char *dispchar; /* Indicates how to display this field | ||
| -- in a connect dialog. Values are: | ||
| -- "" Display entered value as is | ||
| -- "*" Password field - hide value | ||
| -- "D" Debug option - don't show by default */ | ||
| -- int dispsize; /* Field size in characters for dialog */ | ||
| -- } PQconninfoOption; | ||
| data ConninfoOption = ConninfoOption { | ||
| conninfoKeyword :: B.ByteString -- ^ The keyword of the option | ||
| , conninfoEnvVar :: Maybe B.ByteString -- ^ Fallback environment variable name | ||
| , conninfoCompiled :: Maybe B.ByteString -- ^ Fallback compiled in default value | ||
| , conninfoValue :: Maybe B.ByteString -- ^ Option's current value, or NULL | ||
| , conninfoLabel :: B.ByteString -- ^ Label for field in connect dialog | ||
| -- | Indicates how to display this field in a connect dialog. Values are: | ||
| -- "" Display entered value as is | ||
| -- "*" Password field - hide value | ||
| -- "D" Debug option - don't show by default | ||
| , conninfoDispChar :: B.ByteString | ||
| , conninfoDispSize :: CInt -- ^ Field size in characters for dialog | ||
| } | ||
| deriving Show | ||
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| instance Storable ConninfoOption where | ||
| sizeOf _ = #{size PQconninfoOption} | ||
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| alignment _ = #{alignment PQconninfoOption} | ||
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| peek ptr = do | ||
| conninfoKeyword <- B.packCString =<< #{peek PQconninfoOption, keyword} ptr | ||
| conninfoEnvVar <- do | ||
| p <- #{peek PQconninfoOption, envvar} ptr | ||
| if p == nullPtr then pure Nothing else Just <$> B.packCString p | ||
| conninfoCompiled <- do | ||
| p <- #{peek PQconninfoOption, compiled} ptr | ||
| if p == nullPtr then pure Nothing else Just <$> B.packCString p | ||
| conninfoValue <- do | ||
| p <- #{peek PQconninfoOption, val} ptr | ||
| if p == nullPtr then pure Nothing else Just <$> B.packCString p | ||
| conninfoLabel <- B.packCString =<< #{peek PQconninfoOption, label} ptr | ||
| conninfoDispChar <- B.packCString =<< #{peek PQconninfoOption, dispchar} ptr | ||
| conninfoDispSize <- #{peek PQconninfoOption, dispsize} ptr | ||
| return $! ConninfoOption{..} | ||
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| poke ptr ConninfoOption{..} = do | ||
| B.useAsCString conninfoKeyword $ \keyword -> | ||
| maybe ($ nullPtr) B.useAsCString conninfoEnvVar $ \envvar -> | ||
| maybe ($ nullPtr) B.useAsCString conninfoCompiled $ \compiled -> | ||
| maybe ($ nullPtr) B.useAsCString conninfoValue $ \value -> | ||
| B.useAsCString conninfoLabel $ \label -> | ||
| B.useAsCString conninfoDispChar $ \dispchar -> do | ||
| #{poke PQconninfoOption, keyword} ptr keyword | ||
| #{poke PQconninfoOption, envvar} ptr envvar | ||
| #{poke PQconninfoOption, compiled} ptr compiled | ||
| #{poke PQconninfoOption, val} ptr value | ||
| #{poke PQconninfoOption, label} ptr label | ||
| #{poke PQconninfoOption, dispchar} ptr dispchar | ||
| #{poke PQconninfoOption, dispsize} ptr conninfoDispSize | ||
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| ------------------------------------------------------------------------------- | ||
| -- PQconninfoOption | ||
| ------------------------------------------------------------------------------- | ||
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| data PQconninfoOption | ||
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| pqConninfoOptionKeyword :: Int | ||
| pqConninfoOptionKeyword = #{offset PQconninfoOption, keyword} |
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