Data.Store.Version

This module provides utilities which help ensure that we aren't attempting to de-serialize data that is an older or newer version. The WithVersion utility wraps up a datatype along with a version tag. This version tag can either be provided by the user (namedVersionConfig), or use a computed hash (hashedVersionConfig).

The magic here is using an SYB traversal (Data) to get the structure of all the data-types involved. This info is rendered to text and hashed to yield a hash which describes it.

NOTE that this API is still quite new and so is likely to break compatibility in the future. It should also be expected that the computed hashes may change between major version bumps, though this will be minimized when directly feasible.

Documentation

newtype StoreVersion

Constructors

StoreVersion

Fields

• unStoreVersion :: ByteString

Instances

Eq StoreVersion

Methods

(==) :: StoreVersion -> StoreVersion -> Bool

(/=) :: StoreVersion -> StoreVersion -> Bool

Data StoreVersion

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> StoreVersion -> c StoreVersion

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c StoreVersion

toConstr :: StoreVersion -> Constr

dataTypeOf :: StoreVersion -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c StoreVersion)

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c StoreVersion)

gmapT :: (forall b. Data b => b -> b) -> StoreVersion -> StoreVersion

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> StoreVersion -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> StoreVersion -> r

gmapQ :: (forall d. Data d => d -> u) -> StoreVersion -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> StoreVersion -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> StoreVersion -> m StoreVersion

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> StoreVersion -> m StoreVersion

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> StoreVersion -> m StoreVersion

Ord StoreVersion

Methods

compare :: StoreVersion -> StoreVersion -> Ordering

(<) :: StoreVersion -> StoreVersion -> Bool

(<=) :: StoreVersion -> StoreVersion -> Bool

(>) :: StoreVersion -> StoreVersion -> Bool

(>=) :: StoreVersion -> StoreVersion -> Bool

max :: StoreVersion -> StoreVersion -> StoreVersion

min :: StoreVersion -> StoreVersion -> StoreVersion

Show StoreVersion

Methods

showsPrec :: Int -> StoreVersion -> ShowS

show :: StoreVersion -> String

showList :: [StoreVersion] -> ShowS

Generic StoreVersion

Associated Types

type Rep StoreVersion :: * -> *

Methods

from :: StoreVersion -> Rep StoreVersion x

to :: Rep StoreVersion x -> StoreVersion

Store StoreVersion

Methods

size :: Size StoreVersion

poke :: StoreVersion -> Poke ()

peek :: Peek StoreVersion

type Rep StoreVersion

type Rep StoreVersion = D1 (MetaData "StoreVersion" "Data.Store.Version" "store-0.4.3.1-DEUlC4Rng6tITubv6PtM5d" True) (C1 (MetaCons "StoreVersion" PrefixI True) (S1 (MetaSel (Just Symbol "unStoreVersion") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 ByteString)))

data VersionConfig a

Configuration for the version checking of a particular type.

Constructors

VersionConfig

Fields

• vcExpectedHash :: Maybe String

  When set, specifies the hash which is expected to be computed.

• vcManualName :: Maybe String

  When set, specifies the name to instead use to tag the data.

• vcIgnore :: Set String

  DataTypes to ignore.

• vcRenames :: Map String String

  Allowed renamings of datatypes, useful when they move.

Instances

Eq (VersionConfig a)

Methods

(==) :: VersionConfig a -> VersionConfig a -> Bool

(/=) :: VersionConfig a -> VersionConfig a -> Bool

Data a => Data (VersionConfig a)

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> VersionConfig a -> c (VersionConfig a)

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (VersionConfig a)

toConstr :: VersionConfig a -> Constr

dataTypeOf :: VersionConfig a -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c (VersionConfig a))

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (VersionConfig a))

gmapT :: (forall b. Data b => b -> b) -> VersionConfig a -> VersionConfig a

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> VersionConfig a -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> VersionConfig a -> r

gmapQ :: (forall d. Data d => d -> u) -> VersionConfig a -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> VersionConfig a -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> VersionConfig a -> m (VersionConfig a)

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> VersionConfig a -> m (VersionConfig a)

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> VersionConfig a -> m (VersionConfig a)

Show (VersionConfig a)

Methods

showsPrec :: Int -> VersionConfig a -> ShowS

show :: VersionConfig a -> String

showList :: [VersionConfig a] -> ShowS

Generic (VersionConfig a)

Associated Types

type Rep (VersionConfig a) :: * -> *

Methods

from :: VersionConfig a -> Rep (VersionConfig a) x

to :: Rep (VersionConfig a) x -> VersionConfig a

type Rep (VersionConfig a)

type Rep (VersionConfig a) = D1 (MetaData "VersionConfig" "Data.Store.Version" "store-0.4.3.1-DEUlC4Rng6tITubv6PtM5d" False) (C1 (MetaCons "VersionConfig" PrefixI True) ((:*:) ((:*:) (S1 (MetaSel (Just Symbol "vcExpectedHash") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Maybe String))) (S1 (MetaSel (Just Symbol "vcManualName") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Maybe String)))) ((:*:) (S1 (MetaSel (Just Symbol "vcIgnore") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Set String))) (S1 (MetaSel (Just Symbol "vcRenames") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Map String String))))))

hashedVersionConfig :: String -> VersionConfig a

namedVersionConfig :: String -> String -> VersionConfig a

encodeWithVersionQ :: Data a => VersionConfig a -> Q Exp

decodeWithVersionQ :: Data a => VersionConfig a -> Q Exp