adding migration

This commit is contained in:
nek0 2016-08-30 15:09:57 +02:00
parent 13851dad54
commit 0a45da609e

View file

@ -0,0 +1,73 @@
import Database.HDBC
import Database.HDBC.PostgreSQL
import System.IO
import Control.Exception
import Data.Maybe (fromJust)
import qualified Data.Text as T
import qualified Data.ByteString.Char8 as B
import System.FilePath as FP
import Filesystem.Path.CurrentOS
import Codec.Picture
import Codec.Picture.ScaleDCT
import qualified Codec.Picture.Metadata as PM
main :: IO ()
main = do
putStrLn "Enter database host"
dbHost <- getLine
putStrLn "Enter database port"
dbPort <- getLine
putStrLn "Enter database user"
dbUser <- getLine
putStrLn "Enter database name"
dbName <- getLine
putStrLn "Enter database password"
dbPasswd <- getPasswd
let dbString = "host=" ++ dbHost ++ " port=" ++ dbPort ++ " user=" ++ dbUser ++ " dbname=" ++ dbName ++ " password=" ++ dbPasswd
conn <- connectPostgreSQL dbString
-- comment next two lines, if eidolon has been run after the update
-- _ <- run conn "alter table medium add column preview varchar not null default 'fill_me!'" []
-- _ <- run conn "alter table medium add column preview_width int8 not null default 0" []
stmt1 <- prepare conn "select * from medium"
_ <- execute stmt1 []
rows <- fetchAllRowsAL stmt1
-- mapM_ (putStrLn . show) rows
tups <- mapM (\entry ->
case entry of
[("id", theId), _, ("path", SqlByteString path), _, _, _, ("owner", SqlInteger owner), _, _, _, _, ("album", SqlInteger album), _, _] -> do
eimg <- readImageWithMetadata (tail $ B.unpack path)
case eimg of
Left e -> error e
Right (orig, meta) -> do
let newName = takeBaseName (B.unpack path) ++ "_preview.jpg"
newPath = "static" FP.</> "data" FP.</> show owner FP.</> show album FP.</> newName
origPix = convertRGBA8 orig
oWidth = fromIntegral $ fromJust $ PM.lookup PM.Width meta :: Int
oHeight = fromIntegral $ fromJust $ PM.lookup PM.Height meta :: Int
pHeight = 600
pScale = (fromIntegral pHeight :: Double) / (fromIntegral oHeight :: Double)
pWidth = floor (fromIntegral oWidth * pScale)
pPix = scale (pWidth, pHeight) origPix
saveJpgImage 95 newPath $ ImageRGBA8 pPix
return [SqlByteString (B.pack $ '/':newPath), SqlInteger (fromIntegral pWidth), theId]
_ ->
error "malformed entry"
) rows
stmt2 <- prepare conn "update medium set preview = ?, preview_width = ? where id = ?"
executeMany stmt2 tups
commit conn
disconnect conn
putStrLn "Migration successfull!!"
getPasswd :: IO String
getPasswd = do
putStr "Password: "
hFlush stdout
pass <- withEcho False getLine
putChar '\n'
return pass
withEcho :: Bool -> IO a -> IO a
withEcho echo action = do
old <- hGetEcho stdin
bracket_ (hSetEcho stdin echo) (hSetEcho stdin old) action