about summary refs log tree commit diff
path: root/tools/acid-migrate/Acid.hs
blob: 276102eb030ba894cbbb5505c59664f261528812 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, RecordWildCards, 
TemplateHaskell, TypeFamilies, OverloadedStrings, ScopedTypeVariables, BangPatterns #-}

module Main where
import Control.Applicative  ((<$>), optional)
import Control.Exception    (bracket)
import Control.Monad        (msum, mzero)
import Control.Monad.IO.Class (MonadIO)
import Control.Monad.Reader (ask)
import Control.Monad.State  (get, put)
import Control.Monad.Trans  (liftIO)
import Data.Acid
import Data.Acid.Advanced 
import Data.Acid.Local
import Data.ByteString      (ByteString)
import Data.Data            (Data, Typeable)
import Data.IxSet           (Indexable(..), IxSet(..), (@=), Proxy(..), getOne, ixFun, ixSet)
import Data.SafeCopy        (SafeCopy, base, deriveSafeCopy)
import Data.Text            (Text, pack)
import Data.Text.Lazy       (toStrict)
import Data.Time
import           System.Environment(getEnv)


import qualified Crypto.Hash.SHA512 as SHA (hash)
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Base64 as B64 (encode)
import qualified Data.IxSet as IxSet
import qualified Data.Text  as Text


{-CouchDB imports-}

import Database.CouchDB hiding (runCouchDB')
import Database.CouchDB.JSON
import Text.JSON
import Data.List (intersperse, (\\))
import System.Locale (defaultTimeLocale)

-- data types and acid-state setup

newtype EntryId = EntryId { unEntryId :: Integer }
    deriving (Eq, Ord, Data, Enum, Typeable, SafeCopy)

instance Show EntryId where
  show = show . unEntryId

data BlogLang = EN | DE 
    deriving (Eq, Ord, Data, Typeable)

instance Show BlogLang where
    show DE = "de"
    show EN = "en"

$(deriveSafeCopy 0 'base ''BlogLang)

data Comment = Comment    cauthor :: Text,
    ctext   :: Text,
    cdate   :: UTCTime
} deriving (Eq, Ord, Show, Data, Typeable)

$(deriveSafeCopy 0 'base ''Comment)

data Entry = Entry {
    entryId :: EntryId,
    lang   :: BlogLang,
    author :: Text,
    title  :: Text,
    btext  :: Text, 
    mtext  :: Text,
    edate  :: UTCTime,
    tags   :: [Text],
    comments :: [Comment]
} deriving (Eq, Ord, Show, Data, Typeable)

$(deriveSafeCopy 0 'base ''Entry)

-- ixSet requires different datatypes for field indexes, so let's define some
newtype Author = Author Text   deriving (Eq, Ord, Data, Typeable, SafeCopy)
newtype Title  = Title Text    deriving (Eq, Ord, Data, Typeable, SafeCopy)
newtype BText  = BText Text    deriving (Eq, Ord, Data, Typeable, SafeCopy) -- standard text
newtype MText  = MText Text    deriving (Eq, Ord, Data, Typeable, SafeCopy) -- "read more" text
newtype Tag    = Tag Text      deriving (Eq, Ord, Data, Typeable, SafeCopy)
newtype EDate  = EDate UTCTime deriving (Eq, Ord, Data, Typeable, SafeCopy)
newtype SDate  = SDate UTCTime   deriving (Eq, Ord, Data, Typeable, SafeCopy)
newtype Username = Username Text deriving (Eq, Ord, Data, Typeable, SafeCopy)
newtype SessionID = SessionID Text deriving (Eq, Ord, Data, Typeable, SafeCopy)

instance Indexable Entry where 
    empty = ixSet [ ixFun $ \e -> [ entryId e]
                  , ixFun $ (:[]) . lang
                  , ixFun $ \e -> [ Author $ author e ]
                  , ixFun $ \e -> [ Title $ title e]
                  , ixFun $ \e -> [ BText $ btext e]
                  , ixFun $ \e -> [ MText $ mtext e]
                  , ixFun $ \e -> [ EDate $ edate e]
                  , ixFun $ \e -> map Tag (tags e)
                  , ixFun $ comments
                  ]

data User = User {
    username :: Text,
    password :: ByteString
} deriving (Eq, Ord, Data, Typeable)

$(deriveSafeCopy 0 'base ''User)

data Session = Session {
    sessionID :: Text,
    user      :: User,
    sdate     :: UTCTime
} deriving (Eq, Ord, Data, Typeable)

$(deriveSafeCopy 0 'base ''Session)

instance Indexable User where
    empty = ixSet [ ixFun $ \u -> [Username $ username u]
                  , ixFun $ (:[]) . password 
                  ]

instance Indexable Session where
    empty = ixSet [ ixFun $ \s -> [SessionID $ sessionID s]
                  , ixFun $ (:[]) . user
                  , ixFun $ \s -> [SDate $ sdate s]
                  ]

data Blog = Blog {
    blogSessions :: IxSet Session,
    blogUsers    :: IxSet User,
    blogEntries  :: IxSet Entry
} deriving (Data, Typeable)

$(deriveSafeCopy 0 'base ''Blog)

initialBlogState :: Blog 
initialBlogState = 
    Blog { blogSessions = empty
         , blogUsers = empty
         , blogEntries = empty }

-- acid-state database functions (purity is necessary!)

insertEntry :: Entry -> Update Blog Entry
insertEntry e = 
    do b@Blog{..} <- get
       put $ b { blogEntries = IxSet.insert e blogEntries }
       return e

updateEntry :: Entry -> Update Blog Entry
updateEntry e = 
    do b@Blog{..} <- get
       put $ b { blogEntries = IxSet.updateIx (entryId e) e blogEntries}
       return e

getPost :: EntryId -> Query Blog (Maybe Entry)
getPost eid =
    do b@Blog{..} <- ask
       return $ getOne $ blogEntries @= eid

latestPosts :: Query Blog [Entry]
latestPosts =
    do b@Blog{..} <- ask
       return $ IxSet.toDescList (Proxy :: Proxy EDate) $ blogEntries

addSession :: Text -> User -> UTCTime -> Update Blog Session
addSession sId u t =
    do b@Blog{..} <- get
       let s = Session sId u t
       put $ b { blogSessions = IxSet.insert s blogSessions}
       return s

addUser :: Text -> String -> Update Blog User
addUser un pw =
    do b@Blog{..} <- get
       let u = User un $ hashString pw
       put $ b { blogUsers = IxSet.insert u blogUsers}
       return u

-- various functions
hashString :: String -> ByteString
hashString = B64.encode .  SHA.hash . B.pack

$(makeAcidic ''Blog
    [ 'insertEntry
    , 'updateEntry
    , 'getPost
    , 'latestPosts
    , 'addSession
    , 'addUser
    ])

-- CouchDB database functions

runCouchDB' :: CouchMonad a -> IO a
runCouchDB' = runCouchDB "127.0.0.1" 5984

instance JSON Comment where
    showJSON = undefined
    readJSON val = do
        obj <- jsonObject val
        scauthor <- jsonField "cauthor" obj
        jsscdate <- jsonField "cdate" obj :: Result JSValue
        let rcdate = stripResult $ jsonInt jsscdate
        sctext <- jsonField "ctext" obj
        return $ Comment (pack scauthor) (pack sctext) (parseSeconds rcdate)

instance JSON Entry where
    showJSON = undefined
    readJSON val = do
        obj <- jsonObject val
        sauthor <- jsonField "author" obj
        stitle <- jsonField "title" obj
        day <- jsonField "day" obj
        month <- jsonField "month" obj
        year <- jsonField "year" obj
        stext <- jsonField "text" obj
        comments <- jsonField "comments" obj
        oldid <- jsonField "_id" obj
        let leTime = parseShittyTime year month day oldid
        return $ Entry (EntryId $ getUnixTime leTime) DE (pack sauthor) (pack $ stitle \\ "\n") (pack stext) (Text.empty) 
                        leTime [] comments


getUnixTime :: UTCTime -> Integer
getUnixTime t = read $ formatTime defaultTimeLocale "%s" t

parseSeconds :: Integer -> UTCTime
parseSeconds t = readTime defaultTimeLocale "%s" $ show t

parseShittyTime :: Int -> Int -> Int -> String -> UTCTime
parseShittyTime y m d i = readTime defaultTimeLocale "%Y %m %e  %k:%M:%S" newPartTime
    where
        firstPart = take 2 i
        secondPart = take 2 $ drop 2 i
        thirdPart = drop 4 i
        newPartTime =  concat $ intersperse " " [show y, showMonth m, show d, " "] ++ 
                        intersperse ":" [firstPart, secondPart, thirdPart]
        showMonth mn  
                | mn < 10 = "0" ++ show mn
                | otherwise = show mn

getOldEntries = runCouchDB' $ queryView (db "tazblog") (doc "entries") (doc "latestDE") []

parseOldEntries :: IO [Entry]
parseOldEntries = do
    queryResult <- getOldEntries
    let entries = map (stripResult . readJSON . snd) queryResult
    return entries

stripResult :: Result a -> a
stripResult (Ok z) = z
stripResult (Error s) = error $ "JSON error: " ++ s

pasteToDB :: AcidState Blog -> Entry -> IO (EventResult InsertEntry)
pasteToDB acid !e = update' acid (InsertEntry e)

main :: IO()
main = do
    tbDir <- getEnv "TAZBLOG"
    bracket (openLocalStateFrom (tbDir ++ "/BlogState") initialBlogState)
            (createCheckpointAndClose)
            (\acid -> convertEntries acid)

convertEntries acid = do
    entries <- parseOldEntries
    let r =  map forceHack entries
    rs <- sequence r
    putStrLn $ show rs
  where
    forceHack !x = do
        xy <- pasteToDB acid x
        return $ show xy

testThis :: IO ()
testThis = do
  acid <- openLocalState initialBlogState
  allE <- query' acid LatestPosts
  putStrLn $ show allE