Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Use Data.Time.Clock.POSIX.utcTimeToPOSIXSecond for UTCTime #250

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Use Data.Time.Clock.POSIX.utcTimeToPOSIXSecond for UTCTime #250

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
41 changes: 4 additions & 37 deletions Aws/DynamoDb/Core.hs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,7 @@ import Data.Tagged
import qualified Data.Text as T
import qualified Data.Text.Encoding as T
import Data.Time
import Data.Time.Clock.POSIX
import Data.Typeable
import qualified Data.Vector as V
import Data.Word
Expand Down Expand Up @@ -392,45 +393,11 @@ instance DynVal Day where


-------------------------------------------------------------------------------
-- | Losslessly encoded via 'Integer' picoseconds
-- | Losslessly encoded via 'Scientific' picoseconds
instance DynVal UTCTime where
type DynRep UTCTime = DynNumber
fromRep num = fromTS <$> fromRep num
toRep x = toRep (toTS x)


-------------------------------------------------------------------------------
pico :: Rational
pico = toRational $ (10 :: Integer) ^ (12 :: Integer)


-------------------------------------------------------------------------------
dayPico :: Integer
dayPico = 86400 * round pico


-------------------------------------------------------------------------------
-- | Convert UTCTime to picoseconds
--
-- TODO: Optimize performance?
toTS :: UTCTime -> Integer
toTS (UTCTime (ModifiedJulianDay i) diff) = i' + diff'
where
diff' = floor (toRational diff * pico)
i' = i * dayPico


-------------------------------------------------------------------------------
-- | Convert picoseconds to UTCTime
--
-- TODO: Optimize performance?
fromTS :: Integer -> UTCTime
fromTS i = UTCTime (ModifiedJulianDay days) diff
where
(days, secs) = i `divMod` dayPico
diff = fromRational ((toRational secs) / pico)


fromRep (DynNumber i) = Just $ posixSecondsToUTCTime $ realToFrac i
toRep = DynNumber . realToFrac . utcTimeToPOSIXSeconds

-- | Type wrapper for binary data to be written to DynamoDB. Wrap any
-- 'Serialize' instance in there and 'DynVal' will know how to
Expand Down