module Database.MongoDB.BSON
(
BsonValue(..),
BsonDoc,
BinarySubType(..),
empty, lookup,
fromBson, toBson,
fromBsonDoc, toBsonDoc,
getBsonDoc, putBsonDoc,
)
where
import Prelude hiding (lookup)
import Control.Monad
import Data.Binary
import Data.Binary.Get
import Data.Binary.IEEE754
import Data.Binary.Put
import Data.ByteString.Char8 as C8 hiding (empty)
import qualified Data.ByteString.Lazy as L
import qualified Data.ByteString.Lazy.UTF8 as L8
import qualified Data.ByteString.UTF8 as S8
import Data.Convertible
import Data.Int
import qualified Data.Map as Map
import qualified Data.List as List
import Data.Time.Clock.POSIX
import Data.Typeable
import Database.MongoDB.Util
data BsonValue
= BsonDouble Double
| BsonString L8.ByteString
| BsonObject BsonDoc
| BsonArray [BsonValue]
| BsonUndefined
| BsonBinary BinarySubType L.ByteString
| BsonObjectId L.ByteString
| BsonBool !Bool
| BsonDate POSIXTime
| BsonNull
| BsonRegex L8.ByteString String
| BsonSymbol L8.ByteString
| BsonInt32 Int32
| BsonInt64 Int64
| BsonMinKey
| BsonMaxKey
deriving (Show, Eq, Ord)
instance Typeable BsonValue where
typeOf _ = mkTypeName "BsonValue"
type BsonDoc = Map.Map L8.ByteString BsonValue
class BsonDocOps a where
toBsonDoc :: [(a, BsonValue)] -> BsonDoc
fromBsonDoc :: BsonDoc -> [(a, BsonValue)]
lookup :: a -> BsonDoc -> Maybe BsonValue
empty :: BsonDoc
empty = Map.empty
instance BsonDocOps L8.ByteString where
toBsonDoc = Map.fromList
fromBsonDoc = Map.toList
lookup = Map.lookup
instance BsonDocOps String where
toBsonDoc = Map.mapKeys L8.fromString .Map.fromList
fromBsonDoc = Map.toList . Map.mapKeys L8.toString
lookup = Map.lookup . L8.fromString
data DataType =
DataMinKey |
DataNumber |
DataString |
DataObject |
DataArray |
DataBinary |
DataUndefined |
DataOid |
DataBoolean |
DataDate |
DataNull |
DataRegex |
DataRef |
DataCode |
DataSymbol |
DataCodeWScope |
DataInt |
DataTimestamp |
DataLong |
DataMaxKey
deriving (Show, Read, Enum, Eq, Ord)
toDataType :: Int -> DataType
toDataType (1) = DataMinKey
toDataType 127 = DataMaxKey
toDataType d = toEnum d
fromDataType :: DataType -> Int
fromDataType DataMinKey = 1
fromDataType DataMaxKey = 127
fromDataType d = fromEnum d
data BinarySubType =
BSTUNDEFINED1 |
BSTFunction |
BSTByteArray |
BSTUUID |
BSTUNDEFINED2 |
BSTMD5 |
BSTUserDefined
deriving (Show, Read, Enum, Eq, Ord)
toBinarySubType :: Int -> BinarySubType
toBinarySubType 0x80 = BSTUserDefined
toBinarySubType d = toEnum d
fromBinarySubType :: BinarySubType -> Int
fromBinarySubType BSTUserDefined = 0x80
fromBinarySubType d = fromEnum d
getBsonDoc :: Get BsonDoc
getBsonDoc = liftM snd getDoc
putBsonDoc :: BsonDoc -> Put
putBsonDoc = putObj
getVal :: DataType -> Get (Integer, BsonValue)
getVal DataNumber = liftM ((,) 8 . BsonDouble) getFloat64le
getVal DataString = do
sLen1 <- getI32
(_sLen2, s) <- getS
return (fromIntegral $ 4 + sLen1, BsonString s)
getVal DataObject = getDoc >>= \(len, obj) -> return (len, BsonObject obj)
getVal DataArray = do
(len, arr) <- getRawObj
let arr2 = Map.fold (:) [] arr
return (len, BsonArray arr2)
getVal DataBinary = do
skip 4
st <- getI8
len2 <- getI32
bs <- getLazyByteString $ fromIntegral len2
return (4 + 1 + 4 + fromIntegral len2, BsonBinary (toBinarySubType st) bs)
getVal DataUndefined = return (1, BsonUndefined)
getVal DataOid = liftM ((,) 12 . BsonObjectId) $ getLazyByteString 12
getVal DataBoolean = liftM ((,) (1::Integer) . BsonBool . (/= (0::Int))) getI8
getVal DataDate = liftM ((,) 8 . BsonDate . flip (/) 1000 . realToFrac) getI64
getVal DataNull = return (1, BsonNull)
getVal DataRegex = fail "DataCode not yet supported"
getVal DataRef = fail "DataRef is deprecated"
getVal DataCode = fail "DataCode not yet supported"
getVal DataSymbol = do
sLen1 <- getI32
(_sLen2, s) <- getS
return (fromIntegral $ 4 + sLen1, BsonString s)
getVal DataCodeWScope = fail "DataCodeWScope not yet supported"
getVal DataInt = liftM ((,) 4 . BsonInt32 . fromIntegral) getI32
getVal DataTimestamp = fail "DataTimestamp not yet supported"
getVal DataLong = liftM ((,) 8 . BsonInt64) getI64
getVal DataMinKey = return (0, BsonMinKey)
getVal DataMaxKey = return (0, BsonMaxKey)
getInnerObj :: Int32 -> BsonDoc -> Get BsonDoc
getInnerObj 1 obj = return obj
getInnerObj bytesLeft obj = do
typ <- getDataType
(keySz, key) <- getS
(valSz, val) <- getVal typ
getInnerObj (bytesLeft 1 fromIntegral keySz fromIntegral valSz) $
Map.insert key val obj
getRawObj :: Get (Integer, BsonDoc)
getRawObj = do
bytes <- getI32
obj <- getInnerObj (bytes 4) empty
getNull
return (fromIntegral bytes, obj)
getDoc :: Get (Integer, BsonDoc)
getDoc = getRawObj
getDataType :: Get DataType
getDataType = liftM toDataType getI8
putType :: BsonValue -> Put
putType BsonDouble{} = putDataType DataNumber
putType BsonString{} = putDataType DataString
putType BsonObject{} = putDataType DataObject
putType BsonArray{} = putDataType DataArray
putType BsonBinary{} = putDataType DataBinary
putType BsonUndefined = putDataType DataUndefined
putType BsonObjectId{} = putDataType DataOid
putType BsonBool{} = putDataType DataBoolean
putType BsonDate{} = putDataType DataDate
putType BsonNull = putDataType DataNull
putType BsonRegex{} = putDataType DataRegex
putType BsonSymbol{} = putDataType DataSymbol
putType BsonInt32 {} = putDataType DataInt
putType BsonInt64 {} = putDataType DataLong
putType BsonMinKey = putDataType DataMinKey
putType BsonMaxKey = putDataType DataMaxKey
putVal :: BsonValue -> Put
putVal (BsonDouble d) = putFloat64le d
putVal (BsonString s) = putI32 (fromIntegral $ 1 + L8.length s) >> putS s
putVal (BsonObject o) = putObj o
putVal (BsonArray es) = putOutterObj bs
where bs = runPut $ forM_ (List.zip [(0::Int) .. ] es) $ \(i, e) ->
putType e >> putS (L8.fromString $ show i) >> putVal e
putVal (BsonBinary t bs)= do putI32 $ fromIntegral $ 4 + L.length bs
putI8 $ fromBinarySubType t
putI32 $ fromIntegral $ L.length bs
putLazyByteString bs
putVal BsonUndefined = putNothing
putVal (BsonObjectId o) = putLazyByteString o
putVal (BsonBool False) = putI8 (0::Int)
putVal (BsonBool True) = putI8 (1::Int)
putVal (BsonDate pt) = putI64 $ round $ 1000 * (realToFrac pt :: Double)
putVal BsonNull = putNothing
putVal (BsonRegex r opt)= do putS r
putByteString $ pack $ List.sort opt
putNull
putVal (BsonSymbol s) = putI32 (fromIntegral $ 1 + L8.length s) >> putS s
putVal (BsonInt32 i) = putI32 i
putVal (BsonInt64 i) = putI64 i
putVal BsonMinKey = putNothing
putVal BsonMaxKey = putNothing
putObj :: BsonDoc -> Put
putObj obj = putOutterObj bs
where bs = runPut $ forM_ (fromBsonDoc obj) $ \(k, v) ->
putType v >> putS k >> putVal v
putOutterObj :: L.ByteString -> Put
putOutterObj bytes = do
putI32 $ fromIntegral $ 4 + 1 + L.length bytes
putLazyByteString bytes
putNull
putDataType :: DataType -> Put
putDataType = putI8 . fromDataType
class BsonConv a b where
fromBson :: Convertible a b => a -> b
toBson :: Convertible b a => b -> a
instance BsonConv BsonValue a where
fromBson = convert
toBson = convert
instance BsonConv (Maybe BsonValue) (Maybe a) where
fromBson = convert
toBson = convert
unsupportedError :: (Typeable a, Convertible BsonValue a) =>
BsonValue -> ConvertResult a
unsupportedError = convError "Unsupported conversion"
instance Convertible Double BsonValue where
safeConvert = return . BsonDouble
instance Convertible Float BsonValue where
safeConvert = return . BsonDouble . realToFrac
instance Convertible String BsonValue where
safeConvert = return . BsonString . L8.fromString
instance Convertible L8.ByteString BsonValue where
safeConvert = return . BsonString
instance Convertible S8.ByteString BsonValue where
safeConvert = return . BsonString . L.fromChunks . return
instance Convertible [Double] BsonValue where
safeConvert ds = BsonArray `liftM` mapM safeConvert ds
instance Convertible [Float] BsonValue where
safeConvert fs = BsonArray `liftM` mapM safeConvert fs
instance Convertible [String] BsonValue where
safeConvert ss = BsonArray `liftM` mapM safeConvert ss
instance Convertible [L8.ByteString] BsonValue where
safeConvert bs = BsonArray `liftM` mapM safeConvert bs
instance Convertible [S8.ByteString] BsonValue where
safeConvert bs = BsonArray `liftM` mapM safeConvert bs
instance Convertible BsonDoc BsonValue where
safeConvert = return . BsonObject
instance Convertible (Map.Map String BsonValue) BsonValue where
safeConvert = return . BsonObject . Map.mapKeys L8.fromString
instance Convertible [(L8.ByteString, BsonValue)] BsonValue where
safeConvert = return . BsonObject . toBsonDoc
instance Convertible [(String, BsonValue)] BsonValue where
safeConvert = return . BsonObject . toBsonDoc
instance Convertible [Bool] BsonValue where
safeConvert bs = BsonArray `liftM` mapM safeConvert bs
instance Convertible [POSIXTime] BsonValue where
safeConvert ts = BsonArray `liftM` mapM safeConvert ts
instance Convertible [Int] BsonValue where
safeConvert is = BsonArray `liftM` mapM safeConvert is
instance Convertible [Integer] BsonValue where
safeConvert is = BsonArray `liftM` mapM safeConvert is
instance Convertible [Int32] BsonValue where
safeConvert is = BsonArray `liftM` mapM safeConvert is
instance Convertible [Int64] BsonValue where
safeConvert is = BsonArray `liftM` mapM safeConvert is
instance Convertible POSIXTime BsonValue where
safeConvert = return . BsonDate
instance Convertible Bool BsonValue where
safeConvert = return . BsonBool
instance Convertible Int BsonValue where
safeConvert i = if i >= fromIntegral (minBound::Int32) &&
i <= fromIntegral (maxBound::Int32)
then return $ BsonInt32 $ fromIntegral i
else return $ BsonInt64 $ fromIntegral i
instance Convertible Integer BsonValue where
safeConvert i = if i >= fromIntegral (minBound::Int32) &&
i <= fromIntegral (maxBound::Int32)
then return $ BsonInt32 $ fromIntegral i
else return $ BsonInt64 $ fromIntegral i
instance Convertible Int32 BsonValue where
safeConvert = return . BsonInt32
instance Convertible Int64 BsonValue where
safeConvert = return . BsonInt64
instance (Convertible a BsonValue) =>
Convertible (Maybe a) BsonValue where
safeConvert Nothing = return BsonNull
safeConvert (Just a) = safeConvert a
instance Convertible BsonValue Double where
safeConvert (BsonDouble d) = return d
safeConvert (BsonInt32 i) = safeConvert i
safeConvert (BsonInt64 i) = safeConvert i
safeConvert v = unsupportedError v
instance Convertible BsonValue Float where
safeConvert (BsonDouble d) = safeConvert d
safeConvert (BsonInt32 i) = safeConvert i
safeConvert (BsonInt64 i) = safeConvert i
safeConvert v = unsupportedError v
instance Convertible BsonValue String where
safeConvert (BsonString bs) = return $ L8.toString bs
safeConvert v = unsupportedError v
instance Convertible BsonValue L8.ByteString where
safeConvert (BsonString bs) = return bs
safeConvert v = unsupportedError v
instance Convertible BsonValue S8.ByteString where
safeConvert (BsonString bs) = return $ C8.concat $ L.toChunks bs
safeConvert v = unsupportedError v
instance Convertible BsonValue BsonDoc where
safeConvert (BsonObject o) = return o
safeConvert v = unsupportedError v
instance Convertible BsonValue (Map.Map String BsonValue) where
safeConvert (BsonObject o) = return $ Map.mapKeys L8.toString o
safeConvert v = unsupportedError v
instance Convertible BsonValue [(String, BsonValue)] where
safeConvert (BsonObject o) = return $ fromBsonDoc o
safeConvert v = unsupportedError v
instance Convertible BsonValue [(L8.ByteString, BsonValue)] where
safeConvert (BsonObject o) = return $ fromBsonDoc o
safeConvert v = unsupportedError v
instance Convertible BsonValue [Double] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue [Float] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue [String] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue [Bool] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue [POSIXTime] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue [Int32] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue [Int64] where
safeConvert (BsonArray a) = mapM safeConvert a
safeConvert v = unsupportedError v
instance Convertible BsonValue Bool where
safeConvert (BsonBool b) = return b
safeConvert v = unsupportedError v
instance Convertible BsonValue POSIXTime where
safeConvert (BsonDate t) = return t
safeConvert v = unsupportedError v
instance Convertible BsonValue Int where
safeConvert (BsonDouble d) = safeConvert d
safeConvert (BsonInt32 d) = safeConvert d
safeConvert (BsonInt64 d) = safeConvert d
safeConvert v = unsupportedError v
instance Convertible BsonValue Integer where
safeConvert (BsonDouble d) = safeConvert d
safeConvert (BsonInt32 d) = safeConvert d
safeConvert (BsonInt64 d) = safeConvert d
safeConvert v = unsupportedError v
instance Convertible BsonValue Int32 where
safeConvert (BsonDouble d) = safeConvert d
safeConvert (BsonInt32 d) = return d
safeConvert (BsonInt64 d) = safeConvert d
safeConvert v = unsupportedError v
instance Convertible BsonValue Int64 where
safeConvert (BsonDouble d) = safeConvert d
safeConvert (BsonInt32 d) = safeConvert d
safeConvert (BsonInt64 d) = return d
safeConvert v = unsupportedError v
instance (Convertible BsonValue a) =>
Convertible (Maybe BsonValue) (Maybe a) where
safeConvert Nothing = return Nothing
safeConvert (Just a) = liftM Just $ safeConvert a