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|
{- Web url logs.
-
- Copyright 2011, 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Logs.Web (
URLString,
webUUID,
getUrls,
setUrlPresent,
setUrlMissing,
knownUrls,
Downloader(..),
getDownloader,
setDownloader,
) where
import qualified Data.ByteString.Lazy.Char8 as L
import Common.Annex
import Logs
import Logs.Presence
import Logs.Location
import qualified Annex.Branch
import Annex.CatFile
import qualified Git
import qualified Git.LsFiles
type URLString = String
-- Dummy uuid for the whole web. Do not alter.
webUUID :: UUID
webUUID = UUID "00000000-0000-0000-0000-000000000001"
{- Gets all urls that a key might be available from. -}
getUrls :: Key -> Annex [URLString]
getUrls key = go $ urlLogFile key : oldurlLogs key
where
go [] = return []
go (l:ls) = do
us <- currentLog l
if null us
then go ls
else return us
setUrlPresent :: Key -> URLString -> Annex ()
setUrlPresent key url = do
us <- getUrls key
unless (url `elem` us) $ do
addLog (urlLogFile key) =<< logNow InfoPresent url
-- update location log to indicate that the web has the key
logChange key webUUID InfoPresent
setUrlMissing :: Key -> URLString -> Annex ()
setUrlMissing key url = do
addLog (urlLogFile key) =<< logNow InfoMissing url
whenM (null <$> getUrls key) $
logChange key webUUID InfoMissing
{- Finds all known urls. -}
knownUrls :: Annex [URLString]
knownUrls = do
{- Ensure the git-annex branch's index file is up-to-date and
- any journaled changes are reflected in it, since we're going
- to query its index directly. -}
Annex.Branch.update
Annex.Branch.commit "update"
Annex.Branch.withIndex $ do
top <- fromRepo Git.repoPath
(l, cleanup) <- inRepo $ Git.LsFiles.stagedDetails [top]
r <- mapM (geturls . snd) $ filter (isUrlLog . fst) l
void $ liftIO cleanup
return $ concat r
where
geturls Nothing = return []
geturls (Just logsha) = getLog . L.unpack <$> catObject logsha
data Downloader = DefaultDownloader | QuviDownloader
{- Determines the downloader for an URL.
-
- Some URLs are not downloaded by normal means, and this is indicated
- by prefixing them with downloader: when they are recorded in the url
- logs. -}
getDownloader :: URLString -> (URLString, Downloader)
getDownloader u = case separate (== ':') u of
("quvi", u') -> (u', QuviDownloader)
_ -> (u, DefaultDownloader)
setDownloader :: URLString -> Downloader -> URLString
setDownloader u DefaultDownloader = u
setDownloader u QuviDownloader = "quvi:" ++ u
|
