1. Bryan O'Sullivan
  2. mysql


Bryan O'Sullivan  committed 954bcac

A very basic initial commit.

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+                       Version 2.1, February 1999
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File Database/MySQL.hs

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+{-# LANGUAGE DeriveDataTypeable, ForeignFunctionInterface, RecordWildCards #-}
+module Database.MySQL
+    (
+    -- * Types
+      ConnectInfo(..)
+    , Option(..)
+    , defaultConnectInfo
+    , Connection
+    , MySQLError(errNumber, errMessage)
+    -- * Connection management
+    , connect
+    , close
+    ) where
+import Data.Typeable (Typeable)
+import Control.Exception
+import Control.Monad
+import Database.MySQL.C
+import Data.IORef
+import Data.Word (Word16)
+import Foreign.C.String
+import Foreign.ForeignPtr hiding (newForeignPtr)
+import Foreign.Concurrent
+import Foreign.Ptr
+data ConnectInfo = ConnectInfo {
+      connectHost :: String
+    , connectPort :: Word16
+    , connectUser :: String
+    , connectPassword :: String
+    , connectDatabase :: String
+    , connectOptions :: [Option]
+    , connectPath :: FilePath
+    } deriving (Eq, Read, Show, Typeable)
+data MySQLError = ConnectionError {
+      errNumber :: Int
+    , errMessage :: String
+    } deriving (Eq, Show, Typeable)
+instance Exception MySQLError
+data Connection = Connection {
+      connFP :: ForeignPtr MYSQL
+    , connClose :: Closer
+    }
+data Option = Option
+            deriving (Eq, Read, Show, Typeable)
+defaultConnectInfo :: ConnectInfo
+defaultConnectInfo = ConnectInfo {
+                       connectHost = "localhost"
+                     , connectPort = 3306
+                     , connectUser = "root"
+                     , connectPassword = ""
+                     , connectDatabase = "test"
+                     , connectOptions = []
+                     , connectPath = ""
+                     }
+connect :: ConnectInfo -> IO Connection
+connect ConnectInfo{..} = do
+  closed <- newIORef False
+  ptr0 <- mysql_init nullPtr
+  ptr <- withString connectHost $ \chost ->
+          withString connectUser $ \cuser ->
+           withString connectPassword $ \cpass ->
+            withString connectDatabase $ \cdb ->
+             withRTSSignalsBlocked . withString connectPath $
+              mysql_real_connect ptr0 chost cuser cpass cdb
+                                 (fromIntegral connectPort)
+  when (ptr == nullPtr) $
+    connectionError ptr0
+  fp <- newForeignPtr ptr $ realClose closed ptr
+  return Connection {
+               connFP = fp
+             , connClose = realClose closed
+             }
+withString :: String -> (CString -> IO a) -> IO a
+withString [] act = act nullPtr
+withString xs act = withCString xs act
+close :: Connection -> IO ()
+close Connection{..} = withForeignPtr connFP connClose
+realClose :: IORef Bool -> Ptr MYSQL -> IO ()
+realClose closeInfo ptr = do
+  wasClosed <- atomicModifyIORef closeInfo $ \prev -> (True, prev)
+  unless wasClosed . withRTSSignalsBlocked $ mysql_close ptr
+connectionError :: Ptr MYSQL -> IO a
+connectionError ptr = do
+  errno <- mysql_errno ptr
+  msg <- peekCString =<< mysql_error ptr
+  throw $ ConnectionError (fromIntegral errno) msg
+type Closer = Ptr MYSQL -> IO ()

File Database/MySQL/C.hsc

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  • Ignore whitespace
+{-# LANGUAGE EmptyDataDecls, ForeignFunctionInterface #-}
+module Database.MySQL.C
+    (
+    -- * Types
+      MYSQL
+    -- * Connection management
+    , mysql_init
+    , mysql_real_connect
+    , mysql_close
+    -- * Error handling
+    , mysql_errno
+    , mysql_error
+    , mysql_stmt_errno
+    , mysql_stmt_error
+    -- * Support functions
+    , withRTSSignalsBlocked
+    ) where
+#include "mysql.h"
+#include <signal.h>
+import Control.Concurrent (rtsSupportsBoundThreads, runInBoundThread)
+import Control.Exception (finally)
+import Foreign.C.String (CString)
+import Foreign.C.Types (CInt)
+import Foreign.Marshal.Alloc (alloca)
+import Foreign.Ptr (Ptr, nullPtr)
+import Foreign.Storable (Storable(..))
+data MYSQL
+-- | Execute an 'IO' action with signals used by GHC's runtime signals
+-- blocked.  The @mysqlclient@ C library does not correctly restart
+-- system calls if they are interrupted by signals, so many MySQL API
+-- calls can unexpectedly fail when called from a Haskell application.
+-- This is most likely to occur if you are linking against GHC's
+-- threaded runtime (using the @-threaded@ option).
+-- This function blocks @SIGALRM@ and @SIGVTALRM@, runs your action,
+-- then unblocks those signals.  If you have a series of HDBC calls
+-- that may block for a period of time, it may be wise to wrap them in
+-- this action.  Blocking and unblocking signals is cheap, but not
+-- free.
+-- Here is an example of an exception that could be avoided by
+-- temporarily blocking GHC's runtime signals:
+-- >  SqlError {
+-- >    seState = "", 
+-- >    seNativeError = 2003, 
+-- >    seErrorMsg = "Can't connect to MySQL server on 'localhost' (4)"
+-- >  }
+withRTSSignalsBlocked :: IO a -> IO a
+withRTSSignalsBlocked act
+    | not rtsSupportsBoundThreads = act
+    | otherwise = runInBoundThread . alloca $ \set -> do
+  sigemptyset set
+  sigaddset set (#const SIGALRM)
+  sigaddset set (#const SIGVTALRM)
+  pthread_sigmask (#const SIG_BLOCK) set nullPtr
+  act `finally` pthread_sigmask (#const SIG_UNBLOCK) set nullPtr
+data SigSet
+instance Storable SigSet where
+    sizeOf    _ = #{size sigset_t}
+    alignment _ = alignment (undefined :: Ptr CInt)
+foreign import ccall unsafe "signal.h sigaddset" sigaddset
+    :: Ptr SigSet -> CInt -> IO ()
+foreign import ccall unsafe "signal.h sigemptyset" sigemptyset
+    :: Ptr SigSet -> IO ()
+foreign import ccall unsafe "signal.h pthread_sigmask" pthread_sigmask
+    :: CInt -> Ptr SigSet -> Ptr SigSet -> IO ()
+foreign import ccall safe mysql_init
+    :: Ptr MYSQL                -- ^ should usually be 'nullPtr'
+    -> IO (Ptr MYSQL)
+foreign import ccall unsafe mysql_real_connect
+    :: Ptr MYSQL -- ^ context (from 'mysql_init')
+    -> CString   -- ^ hostname
+    -> CString   -- ^ username
+    -> CString   -- ^ password
+    -> CString   -- ^ database
+    -> CInt      -- ^ port
+    -> CString   -- ^ unix socket
+    -> IO (Ptr MYSQL)
+foreign import ccall unsafe mysql_close
+    :: Ptr MYSQL -> IO ()
+foreign import ccall unsafe mysql_errno
+    :: Ptr MYSQL -> IO CInt
+foreign import ccall unsafe mysql_error
+    :: Ptr MYSQL -> IO CString
+foreign import ccall unsafe mysql_stmt_errno
+    :: Ptr MYSQL_STMT -> IO CInt
+foreign import ccall unsafe mysql_stmt_error
+    :: Ptr MYSQL_STMT -> IO CString

File Setup.lhs

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+#!/usr/bin/env runhaskell
+{- OPTIONS_GHC -Wall #-}
+import Control.Monad (liftM2, mplus)
+import Data.List (isPrefixOf)
+import Distribution.PackageDescription
+import Distribution.Simple
+import Distribution.Simple.LocalBuildInfo
+import Distribution.Simple.Program
+import Distribution.Verbosity
+main = defaultMainWithHooks simpleUserHooks {
+  hookedPrograms = [mysqlConfigProgram],
+  confHook = \pkg flags -> do
+    lbi <- confHook simpleUserHooks pkg flags
+    bi  <- mysqlBuildInfo lbi
+    return lbi {
+      localPkgDescr = updatePackageDescription (Just bi, []) (localPkgDescr lbi)
+    }
+mysqlConfigProgram = (simpleProgram "mysql_config") {
+    programFindLocation = \verbosity -> liftM2 mplus
+      (findProgramLocation verbosity "mysql_config")
+      (findProgramLocation verbosity "mysql_config5")
+  }
+mysqlBuildInfo :: LocalBuildInfo -> IO BuildInfo
+mysqlBuildInfo lbi = do
+  let mysqlConfig = fmap words . rawSystemProgramStdoutConf normal
+                    mysqlConfigProgram (withPrograms lbi)
+  include <- mysqlConfig ["--include"]
+  libs <- mysqlConfig ["--libs"]
+  return emptyBuildInfo {
+    extraLibDirs = map (drop 2) . filter ("-L" `isPrefixOf`) $ libs
+  , extraLibs = map (drop 2) . filter ("-l" `isPrefixOf`) $ libs
+  , includeDirs = map (drop 2) include
+  }

File mysql.cabal

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+name:           mysql
+homepage:       https://github.com/mailrank/mysql
+bug-reports:    https://github.com/mailrank/mysql/issues
+synopsis:       A low-level MySQL client library.
+    A low-level client library for the MySQL database, implemented as
+    bindings to the C @mysqlclient@ API.
+license:        LGPL
+license-file:   COPYING
+author:         Bryan O'Sullivan <bos@mailrank.com>
+maintainer:     Bryan O'Sullivan <bos@mailrank.com>
+copyright:      2011 MailRank, Inc.
+category:       Database
+build-type:     Custom
+cabal-version:  >= 1.6
+    README.markdown
+flag developer
+  description: operate in developer mode
+  default: False
+  exposed-modules:
+    Database.MySQL
+    Database.MySQL.C
+  build-depends:
+    base       < 5,
+    bytestring >= 0.9 && < 1.0
+  ghc-options: -Wall
+  if impl(ghc >= 6.8)
+    ghc-options: -fwarn-tabs
+  if flag(developer)
+    ghc-prof-options: -auto-all
+    ghc-options: -Werror
+    cpp-options: -DASSERTS
+source-repository head
+  type:     git
+  location: http://github.com/mailrank/mysql
+source-repository head
+  type:     mercurial
+  location: http://bitbucket.org/bos/mysql