mongodb/Database/MongoDB/BSON.hs

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{-
Copyright (C) 2010 Scott R Parish <srp@srparish.net>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-}
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module Database.MongoDB.BSON
(
-- * Types
BsonValue(..),
BsonDoc,
BinarySubType(..),
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-- * BsonDoc Operations
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empty, lookup,
-- * Type Conversion
fromBson, toBson,
fromBsonDoc, toBsonDoc,
-- * Binary encoding/decoding
getBsonDoc, putBsonDoc,
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)
where
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import Prelude hiding (lookup)
import Control.Monad
import Data.Binary
import Data.Binary.Get
import Data.Binary.IEEE754
import Data.Binary.Put
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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
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import qualified Data.Map as Map
import qualified Data.List as List
import Data.Time.Clock.POSIX
import Data.Typeable
import Database.MongoDB.Util
-- | BsonValue is the type that can be used as a key in a 'BsonDoc'.
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"
-- | BSON Document: this is the top-level (but recursive) type that
-- all MongoDB collections work in terms of. It is a mapping between
-- strings ('Data.ByteString.Lazu.UTF8.ByteString') and 'BsonValue's.
-- It can be constructed either from a 'Map' (eg @'BsonDoc' myMap@) or
-- from a associative list (eg @'toBsonDoc' myAL@).
type BsonDoc = Map.Map L8.ByteString BsonValue
class BsonDocOps a where
-- | Construct a BsonDoc from an associative list
toBsonDoc :: [(a, BsonValue)] -> BsonDoc
-- | Unwrap BsonDoc to be a Map
fromBsonDoc :: BsonDoc -> [(a, BsonValue)]
-- | Return the BsonValue for given key, if any.
lookup :: a -> BsonDoc -> Maybe BsonValue
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-- | An empty BsonDoc
empty :: BsonDoc
empty = Map.empty
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instance BsonDocOps L8.ByteString where
toBsonDoc = Map.fromList
fromBsonDoc = Map.toList
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lookup = Map.lookup
instance BsonDocOps String where
toBsonDoc = Map.mapKeys L8.fromString .Map.fromList
fromBsonDoc = Map.toList . Map.mapKeys L8.toString
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lookup = Map.lookup . L8.fromString
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data DataType =
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DataMinKey | -- -1
DataNumber | -- 1
DataString | -- 2
DataObject | -- 3
DataArray | -- 4
DataBinary | -- 5
DataUndefined | -- 6
DataOid | -- 7
DataBoolean | -- 8
DataDate | -- 9
DataNull | -- 10
DataRegex | -- 11
DataRef | -- 12
DataCode | -- 13
DataSymbol | -- 14
DataCodeWScope | -- 15
DataInt | -- 16
DataTimestamp | -- 17
DataLong | -- 18
DataMaxKey -- 127
deriving (Show, Read, Enum, Eq, Ord)
toDataType :: Int -> DataType
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toDataType (-1) = DataMinKey
toDataType 127 = DataMaxKey
toDataType d = toEnum d
fromDataType :: DataType -> Int
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fromDataType DataMinKey = - 1
fromDataType DataMaxKey = 127
fromDataType d = fromEnum d
data BinarySubType =
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BSTUNDEFINED1 |
BSTFunction | -- 1
BSTByteArray | -- 2
BSTUUID | -- 3
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BSTUNDEFINED2 |
BSTMD5 | -- 5
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)
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getVal DataNumber = liftM ((,) 8 . BsonDouble) getFloat64le
getVal DataString = do
sLen1 <- getI32
(_sLen2, s) <- getS
return (fromIntegral $ 4 + sLen1, BsonString s)
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getVal DataObject = getDoc >>= \(len, obj) -> return (len, BsonObject obj)
getVal DataArray = do
(len, arr) <- getRawObj
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let arr2 = Map.fold (:) [] arr -- reverse and remove key
return (len, BsonArray arr2)
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getVal DataBinary = do
skip 4
st <- getI8
len2 <- getI32
bs <- getLazyByteString $ fromIntegral len2
return (4 + 1 + 4 + fromIntegral len2, BsonBinary (toBinarySubType st) bs)
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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" -- TODO
getVal DataRef = fail "DataRef is deprecated"
getVal DataCode = fail "DataCode not yet supported" -- TODO
getVal DataSymbol = do
sLen1 <- getI32
(_sLen2, s) <- getS
return (fromIntegral $ 4 + sLen1, BsonString s)
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getVal DataCodeWScope = fail "DataCodeWScope not yet supported" -- TODO
getVal DataInt = liftM ((,) 4 . BsonInt32 . fromIntegral) getI32
getVal DataTimestamp = fail "DataTimestamp not yet supported" -- TODO
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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) $
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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
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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 = putDataType DataRef
-- putType = putDataType DataCode
putType BsonSymbol{} = putDataType DataSymbol
-- putType = putDataType DataCodeWScope
putType BsonInt32 {} = putDataType DataInt
putType BsonInt64 {} = putDataType DataLong
-- putType = putDataType DataTimestamp
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) ->
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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
-- the length prefix and null term are included in the length
putI32 $ fromIntegral $ 4 + 1 + L.length bytes
putLazyByteString bytes
putNull
putDataType :: DataType -> Put
putDataType = putI8 . fromDataType
class BsonConv a b where
-- | Convert a BsonValue into a native Haskell type.
fromBson :: Convertible a b => a -> b
-- | Convert a native Haskell type into a BsonValue.
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
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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
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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
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safeConvert = return . BsonInt32
instance Convertible Int64 BsonValue where
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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
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instance Convertible BsonValue (Map.Map String BsonValue) where
safeConvert (BsonObject o) = return $ Map.mapKeys L8.toString o
safeConvert v = unsupportedError v
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instance Convertible BsonValue [(String, BsonValue)] where
safeConvert (BsonObject o) = return $ fromBsonDoc o
safeConvert v = unsupportedError v
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instance Convertible BsonValue [(L8.ByteString, BsonValue)] where
safeConvert (BsonObject o) = return $ fromBsonDoc o
safeConvert v = unsupportedError v
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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