Safe Haskell	Safe-Inferred
Language	Haskell2010

Systemd.Journalctl.Stream

Contents

Journal entry
Streaming
Exceptions

Description

Streaming interface to journalctl. Use entryStream to stream journalctl entries as they are created.

Designed with qualified import in mind. For example, if you import it as Journal, then Entry becomes Journal.Entry, and Exception becomes Journal.Exception.

Synopsis

data Entry = Entry {
- entryPID :: ProcessID
- entryHostname :: Text
- entryCursor :: Cursor
- entryTimestamp :: POSIXTime
- entryUnit :: Maybe Text
- entryMessage :: Text
}
data Cursor
entryStream :: (MonadResource m, MonadThrow m) => Maybe String -> Int -> ConduitT i Entry m ()
data Exception

Journal entry

data Entry Source #

A journal entry.

Constructors

Entry
Fields entryPID :: ProcessID Process ID. entryHostname :: Text The name of the originating host. entryCursor :: Cursor The cursor for the entry. entryTimestamp :: POSIXTime The time the entry was received by the journal. entryUnit :: Maybe Text Unit name, if present. entryMessage :: Text Entry message.

Instances

Instances details

FromJSON Entry Source #
Instance details Defined in Systemd.Journalctl.Stream Methods parseJSON :: Value -> Parser Entry # parseJSONList :: Value -> Parser [Entry] #
Show Entry Source #
Instance details Defined in Systemd.Journalctl.Stream Methods showsPrec :: Int -> Entry -> ShowS # show :: Entry -> String # showList :: [Entry] -> ShowS #

data Cursor Source #

A cursor is an opaque text string that uniquely describes the position of an entry in the journal and is portable across machines, platforms and journal files.

Instances

Instances details

FromJSON Cursor Source #
Instance details Defined in Systemd.Journalctl.Stream Methods parseJSON :: Value -> Parser Cursor # parseJSONList :: Value -> Parser [Cursor] #
Show Cursor Source #
Instance details Defined in Systemd.Journalctl.Stream Methods showsPrec :: Int -> Cursor -> ShowS # show :: Cursor -> String # showList :: [Cursor] -> ShowS #
Eq Cursor Source #
Instance details Defined in Systemd.Journalctl.Stream Methods (==) :: Cursor -> Cursor -> Bool # (/=) :: Cursor -> Cursor -> Bool #

Streaming

entryStream Source #

Arguments

:: (MonadResource m, MonadThrow m)
=> Maybe String	Filter by unit name.
-> Int	Number of previous messages to stream.
-> ConduitT i Entry m ()

Stream of journal entries.

Exceptions

data Exception Source #

Exception raised while streaming entries from journalctl.

Instances

Instances details

Exception Exception Source #
Instance details Defined in Systemd.Journalctl.Stream Methods toException :: Exception -> SomeException # fromException :: SomeException -> Maybe Exception # displayException :: Exception -> String #
Show Exception Source #
Instance details Defined in Systemd.Journalctl.Stream Methods showsPrec :: Int -> Exception -> ShowS # show :: Exception -> String # showList :: [Exception] -> ShowS #