@@ -5,8 +5,8 @@
5{-# LANGUAGE ExistentialQuantification #-}
5{-# LANGUAGE ExistentialQuantification #-}
6{-# LANGUAGE FlexibleContexts #-}
6{-# LANGUAGE FlexibleContexts #-}
7{-# LANGUAGE FlexibleInstances #-}
7{-# LANGUAGE FlexibleInstances #-}
9{-# LANGUAGE GeneralizedNewtypeDeriving #-}
8{-# LANGUAGE GeneralizedNewtypeDeriving #-}
9+{-# LANGUAGE ImplicitParams #-}
10{-# LANGUAGE MultiParamTypeClasses #-}
10{-# LANGUAGE MultiParamTypeClasses #-}
11{-# LANGUAGE OverloadedStrings #-}
11{-# LANGUAGE OverloadedStrings #-}
12{-# LANGUAGE RankNTypes #-}
12{-# LANGUAGE RankNTypes #-}
@@ -22,53 +22,36 @@
22module Katip.Core where
22module Katip.Core where
24-------------------------------------------------------------------------------
24-------------------------------------------------------------------------------
25−import Control.Applicative as A
25+import Control.Applicative as A
26import Control.AutoUpdate
26import Control.AutoUpdate
27import Control.Concurrent
27import Control.Concurrent
28−import qualified Control.Concurrent.Async as Async
29−import Control.Concurrent.STM
30−import qualified Control.Concurrent.STM.TBQueue as BQ
31−import Control.Exception.Safe
32−import Control.Monad (unless, void, when)
33import Control.Monad.Base
28import Control.Monad.Base
34−#if MIN_VERSION_base(4, 9, 0)
35−import qualified Control.Monad.Fail as MF
29+import Control.Monad.Catch
37import Control.Monad.IO.Class
30import Control.Monad.IO.Class
38−import Control.Monad.IO.Unlift
39import Control.Monad.Trans.Class
31import Control.Monad.Trans.Class
40import Control.Monad.Trans.Control
32import Control.Monad.Trans.Control
41−#if !MIN_VERSION_either(4, 5, 0)
42import Control.Monad.Trans.Either
33import Control.Monad.Trans.Either
44import Control.Monad.Trans.Except
34import Control.Monad.Trans.Except
45import Control.Monad.Trans.Maybe
35import Control.Monad.Trans.Maybe
46import Control.Monad.Trans.Reader
36import Control.Monad.Trans.Reader
47−import Control.Monad.Trans.Resource (MonadResource, ResourceT,
37+import Control.Monad.Trans.Resource
49−import Control.Monad.Trans.RWS.Lazy (RWST, mapRWST)
38+import Control.Monad.Trans.State
50−import qualified Control.Monad.Trans.RWS.Strict as Strict (RWST, mapRWST)
51−import Control.Monad.Trans.State.Lazy (StateT, mapStateT)
52−import qualified Control.Monad.Trans.State.Strict as Strict (StateT, mapStateT)
53−import Control.Monad.Trans.Writer.Lazy (WriterT, mapWriterT)
39+import Control.Monad.Trans.Writer
54−import qualified Control.Monad.Trans.Writer.Strict as Strict (WriterT,
56−import Data.Aeson (FromJSON (..), ToJSON (..),
40+import Data.Aeson (FromJSON (..), ToJSON (..),
58−import qualified Data.Aeson as A
42+import qualified Data.Aeson as A
59−import Data.Foldable as FT
43+import Data.Foldable as FT
60−import qualified Data.HashMap.Strict as HM
44+import qualified Data.HashMap.Strict as HM
61import Data.List
45import Data.List
62−import qualified Data.Map.Strict as M
46+import qualified Data.Map.Strict as M
63−import Data.Maybe (fromMaybe)
47+import Data.Semigroup
64−import Data.Semigroup as SG
65import Data.String
48import Data.String
66import Data.String.Conv
49import Data.String.Conv
67−import Data.Text (Text)
50+import Data.Text (Text)
68−import qualified Data.Text as T
51+import qualified Data.Text as T
69−import qualified Data.Text.Lazy.Builder as B
52+import qualified Data.Text.Lazy.Builder as B
70import Data.Time
53import Data.Time
71−import GHC.Generics hiding (to)
54+import GHC.Generics hiding (to)
72#if MIN_VERSION_base(4, 8, 0)
55#if MIN_VERSION_base(4, 8, 0)
73#if !MIN_VERSION_base(4, 9, 0)
56#if !MIN_VERSION_base(4, 9, 0)
74import GHC.SrcLoc
57import GHC.SrcLoc
@@ -76,24 +59,19 @@ import GHC.SrcLoc
76import GHC.Stack
59import GHC.Stack
78import Language.Haskell.TH
61import Language.Haskell.TH
79−import qualified Language.Haskell.TH.Syntax as TH
62+import qualified Language.Haskell.TH.Syntax as TH
80import Lens.Micro
63import Lens.Micro
81import Lens.Micro.TH
64import Lens.Micro.TH
82import Network.HostName
65import Network.HostName
86import System.Posix
66import System.Posix
89-------------------------------------------------------------------------------
67-------------------------------------------------------------------------------
92readMay :: Read a => String -> Maybe a
70readMay :: Read a => String -> Maybe a
93readMay s = case [x | (x,t) <- reads s, ("","") <- lex t] of
71readMay s = case [x | (x,t) <- reads s, ("","") <- lex t] of
94 [x] -> Just x
72 [x] -> Just x
95− [] -> Nothing -- no parse
73+ [] -> Nothing -- no parse
96− _ -> Nothing -- Ambiguous parse
74+ _ -> Nothing -- Ambiguous parse
99-------------------------------------------------------------------------------
77-------------------------------------------------------------------------------
@@ -103,7 +81,7 @@ readMay s = case [x | (x,t) <- reads s, ("","") <- lex t] of
103-- IsString/OverloadedStrings, so "foo" will result in Namespace
81-- IsString/OverloadedStrings, so "foo" will result in Namespace
104-- ["foo"].
82-- ["foo"].
105newtype Namespace = Namespace { unNamespace :: [Text] }
83newtype Namespace = Namespace { unNamespace :: [Text] }
106− deriving (Eq,Show,Read,Ord,Generic,ToJSON,FromJSON,SG.Semigroup,Monoid)
84+ deriving (Eq,Show,Read,Ord,Generic,ToJSON,FromJSON,Semigroup,Monoid)
108instance IsString Namespace where
86instance IsString Namespace where
109 fromString s = Namespace [fromString s]
87 fromString s = Namespace [fromString s]
@@ -143,19 +121,19 @@ data Severity
143-- - 'V3' implies the maximum amount of payload information.
121-- - 'V3' implies the maximum amount of payload information.
144-- - Anything in between is left to the discretion of the developer.
122-- - Anything in between is left to the discretion of the developer.
145data Verbosity = V0 | V1 | V2 | V3
123data Verbosity = V0 | V1 | V2 | V3
146− deriving (Eq, Ord, Show, Read, Generic, Enum, Bounded)
124+ deriving (Eq, Ord, Show, Read, Generic, Enum)
149-------------------------------------------------------------------------------
127-------------------------------------------------------------------------------
150renderSeverity :: Severity -> Text
128renderSeverity :: Severity -> Text
151renderSeverity s = case s of
129renderSeverity s = case s of
152− DebugS -> "Debug"
130+ DebugS -> "Debug"
153− InfoS -> "Info"
131+ InfoS -> "Info"
154− NoticeS -> "Notice"
132+ NoticeS -> "Notice"
155− WarningS -> "Warning"
133+ WarningS -> "Warning"
156− ErrorS -> "Error"
134+ ErrorS -> "Error"
157− CriticalS -> "Critical"
135+ CriticalS -> "Critical"
158− AlertS -> "Alert"
136+ AlertS -> "Alert"
159 EmergencyS -> "Emergency"
137 EmergencyS -> "Emergency"
@@ -181,29 +159,14 @@ instance FromJSON Severity where
181 parseJSON = A.withText "Severity" parseSeverity
159 parseJSON = A.withText "Severity" parseSeverity
183 parseSeverity t = case textToSeverity t of
161 parseSeverity t = case textToSeverity t of
184− Just x -> return x
162+ Just x -> return x
185 Nothing -> fail $ "Invalid Severity " ++ toS t
163 Nothing -> fail $ "Invalid Severity " ++ toS t
187−instance ToJSON Verbosity where
188− toJSON s = A.String $ case s of
194−instance FromJSON Verbosity where
195− parseJSON = A.withText "Verbosity" $ \s -> case s of
200− _ -> fail $ "Invalid Verbosity " ++ toS s
203-------------------------------------------------------------------------------
166-------------------------------------------------------------------------------
204−-- | Log message with Builder underneath; use '<>' to concat in O(1).
167+-- | Log message with Builder unerneath; use '<>' to concat in O(1).
205newtype LogStr = LogStr { unLogStr :: B.Builder }
168newtype LogStr = LogStr { unLogStr :: B.Builder }
206− deriving (Generic, Show, Eq)
169+ deriving (Generic, Show)
208instance IsString LogStr where
171instance IsString LogStr where
209 fromString = LogStr . B.fromString
172 fromString = LogStr . B.fromString
@@ -225,7 +188,7 @@ instance FromJSON LogStr where
226-------------------------------------------------------------------------------
189-------------------------------------------------------------------------------
227-- | Pack any string-like thing into a 'LogStr'. This will
190-- | Pack any string-like thing into a 'LogStr'. This will
228−-- automatically work on 'String', 'ByteString', 'Text' and any of the
191+-- automatically work on 'String', 'ByteString, 'Text' and any of the
229-- lazy variants.
192-- lazy variants.
230logStr :: StringConv a Text => a -> LogStr
193logStr :: StringConv a Text => a -> LogStr
231logStr t = LogStr (B.fromText $ toS t)
194logStr t = LogStr (B.fromText $ toS t)
@@ -250,9 +213,7 @@ newtype ThreadIdText = ThreadIdText {
252mkThreadIdText :: ThreadId -> ThreadIdText
215mkThreadIdText :: ThreadId -> ThreadIdText
253−mkThreadIdText = ThreadIdText . stripPrefix' "ThreadId " . T.pack . show
216+mkThreadIdText = ThreadIdText . T.pack . show
255− stripPrefix' pfx t = fromMaybe t (T.stripPrefix pfx t)
258-------------------------------------------------------------------------------
219-------------------------------------------------------------------------------
@@ -272,62 +233,31 @@ data Item a = Item {
272 } deriving (Generic, Functor)
233 } deriving (Generic, Functor)
273makeLenses ''Item
234makeLenses ''Item
275−-- Manual instance because 'Loc' has no 'Eq' and 'Show' instances in old
276−-- versions of template-haskell (< 2.10)
277−instance Eq a => Eq (Item a) where
278− a == b = FT.and [ _itemApp a == _itemApp b
279− , _itemEnv a == _itemEnv b
280− , _itemSeverity a == _itemSeverity b
281− , _itemThread a == _itemThread b
282− , _itemHost a == _itemHost b
283− , _itemProcess a == _itemProcess b
284− , _itemPayload a == _itemPayload b
285− , _itemMessage a == _itemMessage b
286− , _itemTime a == _itemTime b
287− , _itemNamespace a == _itemNamespace b
288− , case (_itemLoc a, _itemLoc b) of
289− (Nothing, Nothing) -> True
290− (Just l1, Just l2) -> FT.and [ loc_filename l1 == loc_filename l2
291− , loc_package l1 == loc_package l2
292− , loc_module l1 == loc_module l2
293− , loc_start l1 == loc_start l2
294− , loc_end l1 == loc_end l2
299instance Show a => Show (Item a) where
237instance Show a => Show (Item a) where
300− showsPrec d Item{..} = showParen (d >= 11) ( showString "Item {"
238+ show Item{..} = "Item {_itemApp = " ++ show _itemApp ++ ", " ++
301− . field "_itemApp" _itemApp
239+ "_itemEnv = " ++ show _itemEnv ++ ", " ++
302− . field "_itemEnv" _itemEnv
303− . field "_itemSeverity" _itemSeverity
240+ "_itemSeverity = " ++ show _itemSeverity ++ ", " ++
304− . field "_itemThread" _itemThread
241+ "_itemThread = " ++ show _itemThread ++ ", " ++
305− . field "_itemHost" _itemHost
242+ "_itemHost = " ++ show _itemHost ++ ", " ++
306− . field "_itemProcess" _itemProcess
243+ "_itemProcess = " ++ show _itemProcess ++ ", " ++
307− . field "_itemPayload" _itemPayload
244+ "_itemPayload = " ++ show _itemPayload ++ ", " ++
308− . field "_itemMessage" _itemMessage
245+ "_itemMessage = " ++ show _itemMessage ++ ", " ++
309− . field "_itemTime" _itemTime
246+ "_itemTime = " ++ show _itemTime ++ ", " ++
310− . field "_itemNamespace" _itemNamespace
247+ "_itemNamespace = " ++ show _itemNamespace ++ ", " ++
311− . showString "_itemLoc = " . shows (LocShow <$> _itemLoc)
248+ "_itemLoc = " ++ show (LocShow <$> _itemLoc) ++ "}"
315− field n v = showString n . showString " = " . shows v . showString ", "
317newtype LocShow = LocShow Loc
251newtype LocShow = LocShow Loc
320instance Show LocShow where
254instance Show LocShow where
321− showsPrec d (LocShow Loc{..}) = showParen (d >= 11) ( showString "Loc {"
255+ show (LocShow Loc{..}) =
322− . field "loc_filename" loc_filename
256+ "Loc {loc_filename = " ++ show loc_filename ++ ", " ++
323− . field "loc_package" loc_package
257+ "loc_package = " ++ show loc_package ++ ", " ++
324− . field "loc_module" loc_module
258+ "loc_module = " ++ show loc_module ++ ", " ++
325− . field "loc_start" loc_start
259+ "loc_start = " ++ show loc_start ++ ", " ++
326− . showString "loc_end = " . shows loc_end
260+ "loc_end = " ++ show loc_end ++ "}"
330− field n v = showString n . showString " = " . shows v . showString ", "
333instance ToJSON a => ToJSON (Item a) where
263instance ToJSON a => ToJSON (Item a) where
@@ -408,7 +338,7 @@ instance FromJSON ProcessIDJs where
408 parseJSON = A.withText "ProcessID" parseProcessID
338 parseJSON = A.withText "ProcessID" parseProcessID
410 parseProcessID t = case textToProcessID t of
340 parseProcessID t = case textToProcessID t of
411− Just p -> return $ ProcessIDJs p
341+ Just p -> return $ ProcessIDJs p
412 Nothing -> fail $ "Invalid ProcessIDJs " ++ toS t
342 Nothing -> fail $ "Invalid ProcessIDJs " ++ toS t
@@ -445,7 +375,7 @@ class ToObject a where
445 default toObject :: ToJSON a => a -> A.Object
375 default toObject :: ToJSON a => a -> A.Object
446 toObject v = case toJSON v of
376 toObject v = case toJSON v of
447 A.Object o -> o
377 A.Object o -> o
448− _ -> mempty
378+ _ -> mempty
450instance ToObject ()
380instance ToObject ()
451instance ToObject A.Object
381instance ToObject A.Object
@@ -497,7 +427,7 @@ instance ToObject SimpleLogPayload
498instance LogItem SimpleLogPayload where
428instance LogItem SimpleLogPayload where
499 payloadKeys V0 _ = SomeKeys []
429 payloadKeys V0 _ = SomeKeys []
500− payloadKeys _ _ = AllKeys
430+ payloadKeys _ _ = AllKeys
503instance Semigroup SimpleLogPayload where
433instance Semigroup SimpleLogPayload where
@@ -520,7 +450,7 @@ sl a b = SimpleLogPayload [(a, AnyLogPayload b)]
520-- automatically bubble higher verbosity levels to lower ones.
450-- automatically bubble higher verbosity levels to lower ones.
521payloadObject :: LogItem a => Verbosity -> a -> A.Object
451payloadObject :: LogItem a => Verbosity -> a -> A.Object
522payloadObject verb a = case FT.foldMap (flip payloadKeys a) [(V0)..verb] of
452payloadObject verb a = case FT.foldMap (flip payloadKeys a) [(V0)..verb] of
523− AllKeys -> toObject a
453+ AllKeys -> toObject a
524 SomeKeys ks -> HM.filterWithKey (\ k _ -> k `FT.elem` ks) $ toObject a
454 SomeKeys ks -> HM.filterWithKey (\ k _ -> k `FT.elem` ks) $ toObject a
@@ -540,107 +470,49 @@ itemJson verb a = toJSON $ a & itemPayload %~ payloadObject verb
541-- Scribes should always take a 'Severity' and 'Verbosity'.
471-- Scribes should always take a 'Severity' and 'Verbosity'.
543−-- Severity is used to __exclude log messages__ that are lower than
473+-- Severity is used to *exclude log messages* that are < the provided
544−-- the provided Severity. For instance, if the user passes InfoS,
474+-- Severity. For instance, if the user passes InfoS, DebugS items
545−-- DebugS items should be ignored. Katip provides the 'permitItem'
475+-- should be ignored. Katip provides the 'permitItem' utility for this.
546−-- utility for this. The user or the scribe may use 'permitAND' and
547−-- 'permitOR' to further customize this filtering, even dynamically if
550-- Verbosity is used to select keys from the log item's payload. Each
477-- Verbosity is used to select keys from the log item's payload. Each
551-- 'LogItem' instance describes what keys should be retained for each
478-- 'LogItem' instance describes what keys should be retained for each
552-- Verbosity level. Use the 'payloadObject' utility for extracting the keys
479-- Verbosity level. Use the 'payloadObject' utility for extracting the keys
553−-- that should be written.
480+-- that should be permitted.
555−-- Scribes provide a finalizer IO action ('scribeFinalizer') that is
482+-- There is no built-in mechanism in katip for telling a scribe that
556−-- meant to synchronously flush any remaining writes and clean up any
483+-- its time to shut down. 'unregisterScribe' merely drops it from the
557−-- resources acquired when the scribe was created. Internally, katip
484+-- 'LogEnv'. This means there are 2 ways to handle resources as a scribe:
558−-- keeps a buffer for each scribe's writes. When 'closeScribe' or
559−-- 'closeScribes' is called, that buffer stops accepting new log
560−-- messages and after the last item in its buffer is sent to 'liPush',
561−-- calls the finalizer. Thus, when the finalizer returns, katip can
562−-- assume that all resources are cleaned up and all log messages are
565−-- While katip internally buffers messages per 'ScribeSettings', it
486+-- 1. Pass in the resource when the scribe is created. Handle
566−-- sends them one at a time to the scribe. Depending on the scribe
487+-- allocation and release of the resource elsewhere. This is what the
567−-- itself, it may make sense for that scribe to keep its own internal
488+-- Handle scribe does.
568−-- buffer to batch-send logs if writing items one at a time is not
489+--
569−-- efficient. The scribe implementer must be sure that on
490+-- 2. Return a finalizing function that tells the scribe to shut
570−-- finalization, all writes are committed synchronously.
491+-- down. @katip-elasticsearch@'s @mkEsScribe@ returns a @IO (Scribe,
571−
492+-- IO ())@. The finalizer will flush any queued log messages and shut
572−-- | Signature of a function passed to `Scribe` constructor and
493+-- down gracefully before returning. This can be hooked into your
573−-- mkScribe* functions that decides which messages to be
494+-- application's shutdown routine to ensure you never miss any log
574−-- logged. Typically filters based on 'Severity', but can be
495+-- messages on shutdown.
575−-- combined with other, custom logic with 'permitAND' and 'permitOR'
496+data Scribe = Scribe {
576−type PermitFunc = forall a. Item a -> IO Bool
497+ liPush :: forall a. LogItem a => Item a -> IO ()
579−-- | AND together 2 permit functions
580−permitAND :: PermitFunc -> PermitFunc -> PermitFunc
581−permitAND f1 f2 = \a -> liftA2 (&&) (f1 a) (f2 a)
583−-- | OR together 2 permit functions
584−permitOR :: PermitFunc -> PermitFunc -> PermitFunc
585−permitOR f1 f2 = \a -> liftA2 (||) (f1 a) (f2 a)
588−data Scribe = Scribe {
589− liPush :: forall a. LogItem a => Item a -> IO ()
590− -- ^ How do we write an item to the scribe's output?
591− , scribeFinalizer :: IO ()
592− -- ^ Provide a __blocking__ finalizer to call when your scribe is
593− -- removed. All pending writes should be flushed synchronously. If
594− -- this is not relevant to your scribe, return () is fine.
595− , scribePermitItem :: PermitFunc
596− -- ^ Provide a filtering function to allow the item to be logged,
597− -- or not. It can check Severity or some string in item's
598− -- body. The initial value of this is usually created from
599− -- 'permitItem'. Scribes and users can customize this by ANDing
600− -- or ORing onto the default with 'permitAND' or 'permitOR'
604−whenM :: Monad m => m Bool -> m () -> m ()
605−whenM mbool = (>>=) mbool . flip when
608−-- | Combine two scribes. Publishes to the left scribe if the left
609−-- would permit the item and to the right scribe if the right would
610−-- permit the item. Finalizers are called in sequence from left to
612instance Semigroup Scribe where
501instance Semigroup Scribe where
613− (Scribe pushA finA permitA) <> (Scribe pushB finB permitB) =
502+ (Scribe a) <> (Scribe b) = Scribe $ \ item -> do
614− Scribe (\item -> whenM (permitA item) (pushA item)
503+ a item
615− >> whenM (permitB item) (pushB item)
504+ b item
617− (finA `finally` finB)
618− (permitOR permitA permitB)
621instance Monoid Scribe where
507instance Monoid Scribe where
622− mempty = Scribe (const (return ())) (return ()) (permitItem DebugS)
508+ mempty = Scribe $ const $ return ()
623 mappend = (<>)
509 mappend = (<>)
626−-------------------------------------------------------------------------------
627−data ScribeHandle = ScribeHandle {
629− , shChan :: BQ.TBQueue WorkerMessage
633−-------------------------------------------------------------------------------
634−data WorkerMessage where
635− NewItem :: LogItem a => Item a -> WorkerMessage
636− PoisonPill :: WorkerMessage
639-------------------------------------------------------------------------------
512-------------------------------------------------------------------------------
640-- | Should this item be logged given the user's maximum severity?
513-- | Should this item be logged given the user's maximum severity?
641−-- Most new scribes will use this as a base for their 'PermitFunc'
642−permitItem :: Monad m => Severity -> Item a -> m Bool
514+permitItem :: Severity -> Item a -> Bool
643−permitItem sev item = return (_itemSeverity item >= sev)
515+permitItem sev i = _itemSeverity i >= sev
646-------------------------------------------------------------------------------
518-------------------------------------------------------------------------------
@@ -659,16 +531,16 @@ data LogEnv = LogEnv {
659 -- 'AutoUpdate' for high volume logs but note that this may cause
531 -- 'AutoUpdate' for high volume logs but note that this may cause
660 -- some output forms to display logs out of order. Alternatively,
532 -- some output forms to display logs out of order. Alternatively,
661 -- you could just use 'getCurrentTime'.
533 -- you could just use 'getCurrentTime'.
662− , _logEnvScribes :: M.Map Text ScribeHandle
534+ , _logEnvScribes :: M.Map Text Scribe
664makeLenses ''LogEnv
536makeLenses ''LogEnv
667-------------------------------------------------------------------------------
539-------------------------------------------------------------------------------
668−-- | Create a reasonable default InitLogEnv. Uses an 'AutoUpdate' which
540+-- | Create a reasonable default InitLogEnv. Uses an 'AutoUdate' with
669−-- updates the timer every 1ms. If you need even more timestamp
541+-- the default settings as the timer. If you are concerned about
670−-- precision at the cost of performance, consider setting
542+-- timestamp precision or event ordering in log outputs like
671−-- '_logEnvTimer' with 'getCurrentTime'.
543+-- ElasticSearch, you should replace the timer with 'getCurrentTime'
672initLogEnv
544initLogEnv
673 :: Namespace
545 :: Namespace
674 -- ^ A base namespace for this application
546 -- ^ A base namespace for this application
@@ -680,123 +552,45 @@ initLogEnv an env = LogEnv
680 <*> getProcessID
552 <*> getProcessID
681 <*> pure an
553 <*> pure an
682 <*> pure env
554 <*> pure env
683− <*> mkAutoUpdate defaultUpdateSettings { updateAction = getCurrentTime, updateFreq = 1000 }
555+ <*> mkAutoUpdate defaultUpdateSettings { updateAction = getCurrentTime }
684 <*> pure mempty
556 <*> pure mempty
687-------------------------------------------------------------------------------
559-------------------------------------------------------------------------------
688-- | Add a scribe to the list. All future log calls will go to this
560-- | Add a scribe to the list. All future log calls will go to this
689−-- scribe in addition to the others. Writes will be buffered per the
561+-- scribe in addition to the others.
690−-- ScribeSettings to prevent slow scribes from slowing down
691−-- logging. Writes will be dropped if the buffer fills.
692registerScribe
562registerScribe
694 -- ^ Name the scribe
564 -- ^ Name the scribe
695 -> Scribe
565 -> Scribe
697 -> LogEnv
566 -> LogEnv
698− -> IO LogEnv
567+ -> LogEnv
699−registerScribe nm scribe ScribeSettings {..} le = do
700− queue <- atomically (BQ.newTBQueue (fromIntegral _scribeBufferSize))
701− worker <- spawnScribeWorker scribe queue
703− atomically (BQ.writeTBQueue queue PoisonPill)
704− -- wait for our worker to finish final write
705− void (Async.waitCatch worker)
706− -- wait for scribe to finish final write
707− void (scribeFinalizer scribe)
709− let sh = ScribeHandle (scribe { scribeFinalizer = fin }) queue
710− return (le & logEnvScribes %~ M.insert nm sh)
568+registerScribe nm h = logEnvScribes %~ M.insert nm h
713−-------------------------------------------------------------------------------
714−spawnScribeWorker :: Scribe -> BQ.TBQueue WorkerMessage -> IO (Async.Async ())
715−spawnScribeWorker (Scribe write _ _) queue = Async.async go
718− newCmd <- atomically (BQ.readTBQueue queue)
721− -- Swallow any direct exceptions from the
722− -- scribe. safe-exceptions won't catch async exceptions.
723− void (tryAny (write a))
725− PoisonPill -> return ()
728−-------------------------------------------------------------------------------
729−data ScribeSettings = ScribeSettings {
730− _scribeBufferSize :: Int
734−makeLenses ''ScribeSettings
737−-- | Reasonable defaults for a scribe. Buffer
739−defaultScribeSettings :: ScribeSettings
740−defaultScribeSettings = ScribeSettings 4096
743-------------------------------------------------------------------------------
571-------------------------------------------------------------------------------
744−-- | Remove a scribe from the environment. This does __not__ finalize
572+-- | Remove a scribe from the list. All future log calls will no
745−-- the scribe. This mainly only makes sense to use with something like
573+-- longer use this scribe. If the given scribe doesn't exist, its a no-op.
746−-- MonadReader's @local@ function to temporarily disavow a single
747−-- logger for a block of code.
748unregisterScribe
574unregisterScribe
750 -- ^ Name of the scribe
576 -- ^ Name of the scribe
751 -> LogEnv
577 -> LogEnv
752 -> LogEnv
578 -> LogEnv
753−unregisterScribe nm = logEnvScribes %~ M.delete nm
579+unregisterScribe nm = logEnvScribes %~ M.delete nm
756-------------------------------------------------------------------------------
582-------------------------------------------------------------------------------
757−-- | Unregister __all__ scribes. Note that this is __not__ for closing or
583+-- | Unregister *all* scribes. Logs will go off into space from this
758−-- finalizing scribes, use 'closeScribes' for that. This mainly only
584+-- point onward until new scribes are added. Note that you could use
759−-- makes sense to use with something like MonadReader's @local@
585+-- this with `local` if you're using a Reader based stack to
760−-- function to temporarily disavow any loggers for a block of code.
586+-- temporarily disable log output. See `katipNoLogging` for an
761clearScribes
588clearScribes
762 :: LogEnv
589 :: LogEnv
763 -> LogEnv
590 -> LogEnv
764clearScribes = logEnvScribes .~ mempty
591clearScribes = logEnvScribes .~ mempty
767−-------------------------------------------------------------------------------
768−-- | Finalize a scribe. The scribe is removed from the environment,
769−-- its finalizer is called so that it can never be written to again
770−-- and all pending writes are flushed. Note that this will throw any
771−-- exceptions yoru finalizer will throw, and that LogEnv is immutable,
772−-- so it will not be removed in that case.
775− -- ^ Name of the scribe
778−closeScribe nm le = do
779− maybe (return ()) (scribeFinalizer . shScribe) (M.lookup nm (_logEnvScribes le))
780− return (le & logEnvScribes %~ M.delete nm)
783−-------------------------------------------------------------------------------
784−-- | Call this at the end of your program. This is a blocking call
785−-- that stop writing to a scribe's queue, waits for the queue to
786−-- empty, finalizes each scribe in the log environment and then
787−-- removes it. Finalizers are all run even if one of them throws, but
788−-- the exception will be re-thrown at the end.
793− -- We want to run every finalizer here so we'll not save
794− -- intermediate logenvs and just clear scribes at the end.
795− let actions = [void (closeScribe k le) | k <- M.keys (_logEnvScribes le)]
796− FT.foldr finally (return ()) actions
797− return (le & logEnvScribes .~ mempty)
800-------------------------------------------------------------------------------
594-------------------------------------------------------------------------------
801-- | Monads where katip logging actions can be performed. Katip is the
595-- | Monads where katip logging actions can be performed. Katip is the
802-- most basic logging monad. You will typically use this directly if
596-- most basic logging monad. You will typically use this directly if
@@ -807,86 +601,44 @@ closeScribes le = do
807-- which keeps a namespace and merged context. You can write simple
601-- which keeps a namespace and merged context. You can write simple
808-- functions that add additional namespacing and merges additional
602-- functions that add additional namespacing and merges additional
809-- context on the fly.
603-- context on the fly.
811−-- 'localLogEnv' was added to allow for lexically-scoped modifications
812−-- of the log env that are reverted when the supplied monad
813−-- completes. 'katipNoLogging', for example, uses this to temporarily
814−-- pause log outputs.
815class MonadIO m => Katip m where
604class MonadIO m => Katip m where
816 getLogEnv :: m LogEnv
605 getLogEnv :: m LogEnv
817− localLogEnv :: (LogEnv -> LogEnv) -> m a -> m a
820instance Katip m => Katip (ReaderT s m) where
608instance Katip m => Katip (ReaderT s m) where
821 getLogEnv = lift getLogEnv
609 getLogEnv = lift getLogEnv
822− localLogEnv = mapReaderT . localLogEnv
825−#if !MIN_VERSION_either(4, 5, 0)
826instance Katip m => Katip (EitherT s m) where
612instance Katip m => Katip (EitherT s m) where
827 getLogEnv = lift getLogEnv
613 getLogEnv = lift getLogEnv
828− localLogEnv = mapEitherT . localLogEnv
832instance Katip m => Katip (ExceptT s m) where
615instance Katip m => Katip (ExceptT s m) where
833 getLogEnv = lift getLogEnv
616 getLogEnv = lift getLogEnv
834− localLogEnv = mapExceptT . localLogEnv
837instance Katip m => Katip (MaybeT m) where
618instance Katip m => Katip (MaybeT m) where
838 getLogEnv = lift getLogEnv
619 getLogEnv = lift getLogEnv
839− localLogEnv = mapMaybeT . localLogEnv
842instance Katip m => Katip (StateT s m) where
622instance Katip m => Katip (StateT s m) where
843 getLogEnv = lift getLogEnv
623 getLogEnv = lift getLogEnv
844− localLogEnv = mapStateT . localLogEnv
847−instance (Katip m, Monoid w) => Katip (RWST r w s m) where
848− getLogEnv = lift getLogEnv
849− localLogEnv = mapRWST . localLogEnv
852−instance (Katip m, Monoid w) => Katip (Strict.RWST r w s m) where
853− getLogEnv = lift getLogEnv
854− localLogEnv = Strict.mapRWST . localLogEnv
857−instance Katip m => Katip (Strict.StateT s m) where
858− getLogEnv = lift getLogEnv
859− localLogEnv = Strict.mapStateT . localLogEnv
862instance (Katip m, Monoid s) => Katip (WriterT s m) where
626instance (Katip m, Monoid s) => Katip (WriterT s m) where
863 getLogEnv = lift getLogEnv
627 getLogEnv = lift getLogEnv
864− localLogEnv = mapWriterT . localLogEnv
867−instance (Katip m, Monoid s) => Katip (Strict.WriterT s m) where
868− getLogEnv = lift getLogEnv
869− localLogEnv = Strict.mapWriterT . localLogEnv
872instance (Katip m) => Katip (ResourceT m) where
629instance (Katip m) => Katip (ResourceT m) where
873 getLogEnv = lift getLogEnv
630 getLogEnv = lift getLogEnv
874− localLogEnv = transResourceT . localLogEnv
877-------------------------------------------------------------------------------
633-------------------------------------------------------------------------------
878−-- | A concrete monad you can use to run logging actions. Use this if
634+-- | A concrete monad you can use to run logging actions.
879−-- you prefer an explicit monad transformer stack and adding layers as
880−-- opposed to implementing 'Katip' for your monad.
881newtype KatipT m a = KatipT { unKatipT :: ReaderT LogEnv m a }
635newtype KatipT m a = KatipT { unKatipT :: ReaderT LogEnv m a }
882 deriving ( Functor, Applicative, Monad, MonadIO
636 deriving ( Functor, Applicative, Monad, MonadIO
883− , MonadMask, MonadCatch, MonadThrow, MonadResource, MonadTrans
637+ , MonadMask, MonadCatch, MonadThrow, MonadTrans, MonadBase b)
887instance MonadIO m => Katip (KatipT m) where
640instance MonadIO m => Katip (KatipT m) where
888 getLogEnv = KatipT ask
641 getLogEnv = KatipT ask
889− localLogEnv f (KatipT m) = KatipT $ local f m
892instance MonadTransControl KatipT where
644instance MonadTransControl KatipT where
@@ -902,21 +654,6 @@ instance (MonadBaseControl b m) => MonadBaseControl b (KatipT m) where
902 liftBaseWith = defaultLiftBaseWith
654 liftBaseWith = defaultLiftBaseWith
903 restoreM = defaultRestoreM
655 restoreM = defaultRestoreM
905−instance MonadUnliftIO m => MonadUnliftIO (KatipT m) where
906−#if MIN_VERSION_unliftio_core(0, 2, 0)
907− withRunInIO inner = KatipT $ ReaderT $ \le -> withRunInIO $ \run ->
908− inner (run . runKatipT le)
910− askUnliftIO = KatipT $
911− withUnliftIO $ \u ->
912− pure (UnliftIO (unliftIO u . unKatipT))
915−#if MIN_VERSION_base(4, 9, 0)
916−instance MF.MonadFail m => MF.MonadFail (KatipT m) where
917− fail msg = lift (MF.fail msg)
921-------------------------------------------------------------------------------
658-------------------------------------------------------------------------------
922-- | Execute 'KatipT' on a log env.
659-- | Execute 'KatipT' on a log env.
@@ -924,17 +661,6 @@ runKatipT :: LogEnv -> KatipT m a -> m a
924runKatipT le (KatipT f) = runReaderT f le
661runKatipT le (KatipT f) = runReaderT f le
927−-------------------------------------------------------------------------------
928−-- | Disable all scribes for the given monadic action, then restore
929−-- them afterwards. Works in any Katip monad.
935−katipNoLogging = localLogEnv (\le -> set logEnvScribes mempty le)
938-------------------------------------------------------------------------------
664-------------------------------------------------------------------------------
939-- | Log with everything, including a source code location. This is
665-- | Log with everything, including a source code location. This is
940-- very low level and you typically can use 'logT' in its place.
666-- very low level and you typically can use 'logT' in its place.
@@ -948,43 +674,20 @@ logItem
949logItem a ns loc sev msg = do
675logItem a ns loc sev msg = do
950 LogEnv{..} <- getLogEnv
676 LogEnv{..} <- getLogEnv
951− logKatipItem =<< liftIO
677+ liftIO $ do
952− (Item <$> pure _logEnvApp
679+ <$> pure _logEnvApp
953− <*> pure _logEnvEnv
680+ <*> pure _logEnvEnv
954− <*> pure sev
681+ <*> pure sev
955− <*> (mkThreadIdText <$> myThreadId)
682+ <*> (mkThreadIdText <$> myThreadId)
956− <*> pure _logEnvHost
683+ <*> pure _logEnvHost
957− <*> pure _logEnvPid
684+ <*> pure _logEnvPid
958− <*> pure a
685+ <*> pure a
959− <*> pure msg
686+ <*> pure msg
960− <*> _logEnvTimer
687+ <*> _logEnvTimer
961− <*> pure (_logEnvApp <> ns)
688+ <*> pure (_logEnvApp <> ns)
962− <*> pure loc)
689+ <*> pure loc
964−-- | Log already constructed 'Item'. This is the lowest level function that other log*
966−-- It can be useful when implementing centralised logging services.
968− :: (A.Applicative m, LogItem a, Katip m)
971−logKatipItem item = do
972− LogEnv{..} <- getLogEnv
974− FT.forM_ (M.elems _logEnvScribes) $ \ ScribeHandle {..} -> do
690+ FT.forM_ (M.elems _logEnvScribes) $ \ (Scribe h) -> h item
975− whenM (scribePermitItem shScribe item) $
976− void $ atomically (tryWriteTBQueue shChan (NewItem item))
978−-------------------------------------------------------------------------------
984−tryWriteTBQueue q a = do
985− full <- isFullTBQueue q
986− unless full (writeTBQueue q a)
990-------------------------------------------------------------------------------
693-------------------------------------------------------------------------------
@@ -1016,10 +719,10 @@ logException
1016 -> Severity -- ^ Severity
719 -> Severity -- ^ Severity
1017 -> m b -- ^ Main action being run
720 -> m b -- ^ Main action being run
1019−logException a ns sev action = action `catchAny` \e -> f e >> throwM e
722+logException a ns sev action = action `catchAll` \e -> f e >> throwM e
1021 f e = logF a ns sev (msg e)
724 f e = logF a ns sev (msg e)
1022− msg e = ls (T.pack "An exception has occurred: ") <> showLS e
725+ msg e = ls (T.pack "An exception has occured: ") <> showLS e
1025-------------------------------------------------------------------------------
728-------------------------------------------------------------------------------
@@ -1047,14 +750,14 @@ instance TH.Lift Verbosity where
1049instance TH.Lift Severity where
752instance TH.Lift Severity where
1050− lift DebugS = [| DebugS |]
753+ lift DebugS = [| DebugS |]
1051− lift InfoS = [| InfoS |]
754+ lift InfoS = [| InfoS |]
1052− lift NoticeS = [| NoticeS |]
755+ lift NoticeS = [| NoticeS |]
1053− lift WarningS = [| WarningS |]
756+ lift WarningS = [| WarningS |]
1054− lift ErrorS = [| ErrorS |]
757+ lift ErrorS = [| ErrorS |]
1055 lift CriticalS = [| CriticalS |]
758 lift CriticalS = [| CriticalS |]
1056− lift AlertS = [| AlertS |]
759+ lift AlertS = [| AlertS |]
1057− lift EmergencyS = [| EmergencyS |]
760+ lift EmergencyS = [| EmergencyS |]
1060-- | Lift a location into an Exp.
763-- | Lift a location into an Exp.
@@ -1073,15 +776,11 @@ liftLoc (Loc a b c (d1, d2) (e1, e2)) = [|Loc
1073-- fill the 'Maybe Loc' gap in 'logF' of this module, and relies on implicit
776-- fill the 'Maybe Loc' gap in 'logF' of this module, and relies on implicit
1074-- callstacks when available (GHC > 7.8).
777-- callstacks when available (GHC > 7.8).
1075#if MIN_VERSION_base(4, 8, 0)
778#if MIN_VERSION_base(4, 8, 0)
1076−getLoc :: HasCallStack => Maybe Loc
779+getLoc :: (?loc :: CallStack) => Maybe Loc
1077−getLoc = case getCallStack callStack of
780+getLoc = case getCallStack ?loc of
1078 [] -> Nothing
781 [] -> Nothing
1079− xs -> Just . toLoc . head $ filter filterKatip xs
782+ xs -> Just . toLoc . last $ xs
1081− filterKatip :: (String, SrcLoc) -> Bool
1082− filterKatip (_, srcloc) = not $
1083− "katip-" `isPrefixOf` srcLocPackage srcloc
1085 toLoc :: (String, SrcLoc) -> Loc
784 toLoc :: (String, SrcLoc) -> Loc
1086 toLoc (_, l) = Loc {
785 toLoc (_, l) = Loc {
1087 loc_filename = srcLocFile l
786 loc_filename = srcLocFile l
@@ -1112,7 +811,7 @@ logT = [| \ a ns sev msg -> logItem a ns (Just $(getLocTH)) sev msg |]
1114-------------------------------------------------------------------------------
813-------------------------------------------------------------------------------
1115−-- | 'Loc'-tagged logging using 'GHC.Stack' when available.
814+-- | 'Loc'-tagged logging using implicit-callstacks when available.
1117-- This function does not require template-haskell as it
816-- This function does not require template-haskell as it
1118-- automatically uses <https://hackage.haskell.org/package/base-4.8.2.0/docs/GHC-Stack.html#v:getCallStack implicit-callstacks>
817-- automatically uses <https://hackage.haskell.org/package/base-4.8.2.0/docs/GHC-Stack.html#v:getCallStack implicit-callstacks>
@@ -1122,11 +821,7 @@ logT = [| \ a ns sev msg -> logItem a ns (Just $(getLocTH)) sev msg |]
1122-- `logT` for maximum compatibility.
821-- `logT` for maximum compatibility.
1124-- @logLoc obj mempty InfoS "Hello world"@
823-- @logLoc obj mempty InfoS "Hello world"@
1125−#if MIN_VERSION_base(4, 8, 0)
1126−logLoc :: (Applicative m, LogItem a, Katip m, HasCallStack)
1128logLoc :: (Applicative m, LogItem a, Katip m)
824logLoc :: (Applicative m, LogItem a, Katip m)
1131 -> Namespace
826 -> Namespace
1132 -> Severity
827 -> Severity