36f0bdcd57Added annex.alwayscompact setting which can be unset to speed up writes to the git-annex branch in some cases. Sponsored-by: Dartmouth College's DANDI project
132 lines
3.9 KiB
Haskell
132 lines
3.9 KiB
Haskell
{- Web url logs.
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-
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- Copyright 2011-2021 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE BangPatterns #-}
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module Logs.Web (
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URLString,
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getUrls,
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getUrlsWithPrefix,
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setUrlPresent,
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setUrlMissing,
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Downloader(..),
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getDownloader,
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setDownloader,
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setDownloader',
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setTempUrl,
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removeTempUrl,
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parseUrlLog,
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) where
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import qualified Data.Map as M
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import qualified Data.ByteString.Lazy as L
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import Annex.Common
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import qualified Annex
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import Logs
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import Logs.Presence
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import Logs.Location
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import Utility.Url
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import Annex.UUID
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import qualified Annex.Branch
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import qualified Types.Remote as Remote
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{- Gets all urls that a key might be available from. -}
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getUrls :: Key -> Annex [URLString]
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getUrls key = do
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config <- Annex.getGitConfig
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l <- go $ urlLogFile config key : oldurlLogs config key
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tmpl <- Annex.getState (maybeToList . M.lookup key . Annex.tempurls)
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return (tmpl ++ l)
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where
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go [] = return []
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go (l:ls) = do
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us <- currentLogInfo l
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if null us
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then go ls
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else return $ map decodeUrlLogInfo us
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getUrlsWithPrefix :: Key -> String -> Annex [URLString]
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getUrlsWithPrefix key prefix = filter (prefix `isPrefixOf`)
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. map (fst . getDownloader)
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<$> getUrls key
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setUrlPresent :: Key -> URLString -> Annex ()
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setUrlPresent key url = do
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-- Avoid reading the url log when not compacting, for speed.
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us <- ifM (annexAlwaysCompact <$> Annex.getGitConfig)
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( getUrls key
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, pure mempty
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)
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unless (url `elem` us) $ do
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config <- Annex.getGitConfig
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addLog (Annex.Branch.RegardingUUID []) (urlLogFile config key)
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InfoPresent (LogInfo (encodeBS url))
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-- If the url does not have an OtherDownloader, it must be present
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-- in the web.
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case snd (getDownloader url) of
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OtherDownloader -> return ()
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_ -> logChange key webUUID InfoPresent
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setUrlMissing :: Key -> URLString -> Annex ()
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setUrlMissing key url = do
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-- Avoid making any changes if the url was not registered.
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us <- getUrls key
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when (url `elem` us) $ do
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config <- Annex.getGitConfig
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addLog (Annex.Branch.RegardingUUID []) (urlLogFile config key)
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InfoMissing (LogInfo (encodeBS url))
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-- If the url was a web url and none of the remaining urls
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-- for the key are web urls, the key must not be present
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-- in the web.
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when (isweb url && null (filter isweb $ filter (/= url) us)) $
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logChange key webUUID InfoMissing
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where
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isweb u = case snd (getDownloader u) of
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OtherDownloader -> False
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_ -> True
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setTempUrl :: Key -> URLString -> Annex ()
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setTempUrl key url = Annex.changeState $ \s ->
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s { Annex.tempurls = M.insert key url (Annex.tempurls s) }
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removeTempUrl :: Key -> Annex ()
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removeTempUrl key = Annex.changeState $ \s ->
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s { Annex.tempurls = M.delete key (Annex.tempurls s) }
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data Downloader = WebDownloader | YoutubeDownloader | QuviDownloader | OtherDownloader
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deriving (Eq, Show, Enum, Bounded)
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{- To keep track of how an url is downloaded, it's mangled slightly in
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- the log, with a prefix indicating when a Downloader is used. -}
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setDownloader :: URLString -> Downloader -> String
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setDownloader u WebDownloader = u
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setDownloader u QuviDownloader = "quvi:" ++ u
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setDownloader u YoutubeDownloader = "yt:" ++ u
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setDownloader u OtherDownloader = ":" ++ u
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setDownloader' :: URLString -> Remote -> String
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setDownloader' u r
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| Remote.uuid r == webUUID = setDownloader u WebDownloader
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| otherwise = setDownloader u OtherDownloader
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getDownloader :: URLString -> (URLString, Downloader)
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getDownloader u = case separate (== ':') u of
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("yt", u') -> (u', YoutubeDownloader)
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-- quvi is not used any longer; youtube-dl should be able to handle
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-- all urls it did.
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("quvi", u') -> (u', YoutubeDownloader)
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("", u') -> (u', OtherDownloader)
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_ -> (u, WebDownloader)
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decodeUrlLogInfo :: LogInfo -> URLString
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decodeUrlLogInfo = decodeBS . fromLogInfo
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{- Parses the content of an url log file, returning the urls that are
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- currently recorded. -}
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parseUrlLog :: L.ByteString -> [URLString]
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parseUrlLog = map decodeUrlLogInfo . getLog
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