{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}

module Network.QUIC.Recovery.LossRecovery (
    onPacketSent,
    onPacketReceived,
    onAckReceived,
    onPacketNumberSpaceDiscarded,
) where

import Data.Sequence (Seq, ViewR (..), (|>))
import qualified Data.Sequence as Seq
import UnliftIO.STM

import Network.QUIC.Connector
import Network.QUIC.Imports
import Network.QUIC.Qlog
import Network.QUIC.Recovery.Constants
import Network.QUIC.Recovery.Detect
import Network.QUIC.Recovery.Metrics
import Network.QUIC.Recovery.Misc
import Network.QUIC.Recovery.PeerPacketNumbers
import Network.QUIC.Recovery.Release
import Network.QUIC.Recovery.Timer
import Network.QUIC.Recovery.Types
import Network.QUIC.Recovery.Utils
import Network.QUIC.Types

----------------------------------------------------------------

onPacketSent :: LDCC -> SentPacket -> IO ()
onPacketSent :: LDCC -> SentPacket -> IO ()
onPacketSent ldcc :: LDCC
ldcc@LDCC{Array EncryptionLevel (IORef Bool)
Array EncryptionLevel (IORef PeerPacketNumbers)
Array EncryptionLevel (IORef LossDetection)
Array EncryptionLevel (IORef SentPackets)
TVar (Maybe EncryptionLevel)
TVar TimerInfoQ
TVar CC
TVar SentPackets
IORef Bool
IORef Int
IORef (Maybe TimeoutKey)
IORef (Maybe TimerInfo)
IORef PeerPacketNumbers
IORef RTT
ConnState
PlainPacket -> IO ()
QLogger
timerInfoQ :: LDCC -> TVar TimerInfoQ
previousRTT1PPNs :: LDCC -> IORef PeerPacketNumbers
peerPacketNumbers :: LDCC -> Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: LDCC -> IORef Int
speedingUp :: LDCC -> IORef Bool
ptoPing :: LDCC -> TVar (Maybe EncryptionLevel)
lostCandidates :: LDCC -> TVar SentPackets
timerInfo :: LDCC -> IORef (Maybe TimerInfo)
timerKey :: LDCC -> IORef (Maybe TimeoutKey)
lossDetection :: LDCC -> Array EncryptionLevel (IORef LossDetection)
sentPackets :: LDCC -> Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: LDCC -> Array EncryptionLevel (IORef Bool)
recoveryCC :: LDCC -> TVar CC
recoveryRTT :: LDCC -> IORef RTT
putRetrans :: LDCC -> PlainPacket -> IO ()
ldccQlogger :: LDCC -> QLogger
ldccState :: LDCC -> ConnState
timerInfoQ :: TVar TimerInfoQ
previousRTT1PPNs :: IORef PeerPacketNumbers
peerPacketNumbers :: Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: IORef Int
speedingUp :: IORef Bool
ptoPing :: TVar (Maybe EncryptionLevel)
lostCandidates :: TVar SentPackets
timerInfo :: IORef (Maybe TimerInfo)
timerKey :: IORef (Maybe TimeoutKey)
lossDetection :: Array EncryptionLevel (IORef LossDetection)
sentPackets :: Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: Array EncryptionLevel (IORef Bool)
recoveryCC :: TVar CC
recoveryRTT :: IORef RTT
putRetrans :: PlainPacket -> IO ()
ldccQlogger :: QLogger
ldccState :: ConnState
..} SentPacket
sentPacket = do
    let lvl0 :: EncryptionLevel
lvl0 = SentPacket -> EncryptionLevel
spEncryptionLevel SentPacket
sentPacket
    let lvl :: EncryptionLevel
lvl
            | EncryptionLevel
lvl0 forall a. Eq a => a -> a -> Bool
== EncryptionLevel
RTT0Level = EncryptionLevel
RTT1Level
            | Bool
otherwise = EncryptionLevel
lvl0
    Bool
discarded <- LDCC -> EncryptionLevel -> IO Bool
getPacketNumberSpaceDiscarded LDCC
ldcc EncryptionLevel
lvl
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless Bool
discarded forall a b. (a -> b) -> a -> b
$ do
        LDCC -> SentPacket -> IO ()
onPacketSentCC LDCC
ldcc SentPacket
sentPacket
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (SentPacket -> Bool
spAckEliciting SentPacket
sentPacket) forall a b. (a -> b) -> a -> b
$
            forall a. IORef a -> (a -> a) -> IO ()
atomicModifyIORef'' (Array EncryptionLevel (IORef LossDetection)
lossDetection forall i e. Ix i => Array i e -> i -> e
! EncryptionLevel
lvl) forall a b. (a -> b) -> a -> b
$ \LossDetection
ld ->
                LossDetection
ld
                    { timeOfLastAckElicitingPacket :: TimeMicrosecond
timeOfLastAckElicitingPacket = SentPacket -> TimeMicrosecond
spTimeSent SentPacket
sentPacket
                    }
        forall a. IORef a -> (a -> a) -> IO ()
atomicModifyIORef'' (Array EncryptionLevel (IORef SentPackets)
sentPackets forall i e. Ix i => Array i e -> i -> e
! EncryptionLevel
lvl) forall a b. (a -> b) -> a -> b
$
            \(SentPackets Seq SentPacket
db) -> Seq SentPacket -> SentPackets
SentPackets (Seq SentPacket
db forall a. Seq a -> a -> Seq a
|> SentPacket
sentPacket)
        LDCC -> EncryptionLevel -> IO ()
setLossDetectionTimer LDCC
ldcc EncryptionLevel
lvl

onPacketSentCC :: LDCC -> SentPacket -> IO ()
onPacketSentCC :: LDCC -> SentPacket -> IO ()
onPacketSentCC ldcc :: LDCC
ldcc@LDCC{Array EncryptionLevel (IORef Bool)
Array EncryptionLevel (IORef PeerPacketNumbers)
Array EncryptionLevel (IORef LossDetection)
Array EncryptionLevel (IORef SentPackets)
TVar (Maybe EncryptionLevel)
TVar TimerInfoQ
TVar CC
TVar SentPackets
IORef Bool
IORef Int
IORef (Maybe TimeoutKey)
IORef (Maybe TimerInfo)
IORef PeerPacketNumbers
IORef RTT
ConnState
PlainPacket -> IO ()
QLogger
timerInfoQ :: TVar TimerInfoQ
previousRTT1PPNs :: IORef PeerPacketNumbers
peerPacketNumbers :: Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: IORef Int
speedingUp :: IORef Bool
ptoPing :: TVar (Maybe EncryptionLevel)
lostCandidates :: TVar SentPackets
timerInfo :: IORef (Maybe TimerInfo)
timerKey :: IORef (Maybe TimeoutKey)
lossDetection :: Array EncryptionLevel (IORef LossDetection)
sentPackets :: Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: Array EncryptionLevel (IORef Bool)
recoveryCC :: TVar CC
recoveryRTT :: IORef RTT
putRetrans :: PlainPacket -> IO ()
ldccQlogger :: QLogger
ldccState :: ConnState
timerInfoQ :: LDCC -> TVar TimerInfoQ
previousRTT1PPNs :: LDCC -> IORef PeerPacketNumbers
peerPacketNumbers :: LDCC -> Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: LDCC -> IORef Int
speedingUp :: LDCC -> IORef Bool
ptoPing :: LDCC -> TVar (Maybe EncryptionLevel)
lostCandidates :: LDCC -> TVar SentPackets
timerInfo :: LDCC -> IORef (Maybe TimerInfo)
timerKey :: LDCC -> IORef (Maybe TimeoutKey)
lossDetection :: LDCC -> Array EncryptionLevel (IORef LossDetection)
sentPackets :: LDCC -> Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: LDCC -> Array EncryptionLevel (IORef Bool)
recoveryCC :: LDCC -> TVar CC
recoveryRTT :: LDCC -> IORef RTT
putRetrans :: LDCC -> PlainPacket -> IO ()
ldccQlogger :: LDCC -> QLogger
ldccState :: LDCC -> ConnState
..} SentPacket
sentPacket = LDCC -> IO () -> IO ()
metricsUpdated LDCC
ldcc forall a b. (a -> b) -> a -> b
$
    forall (m :: * -> *) a. MonadIO m => STM a -> m a
atomically forall a b. (a -> b) -> a -> b
$
        forall a. TVar a -> (a -> a) -> STM ()
modifyTVar' TVar CC
recoveryCC forall a b. (a -> b) -> a -> b
$ \CC
cc ->
            CC
cc
                { bytesInFlight :: Int
bytesInFlight = CC -> Int
bytesInFlight CC
cc forall a. Num a => a -> a -> a
+ Int
sentBytes
                , numOfAckEliciting :: Int
numOfAckEliciting = CC -> Int
numOfAckEliciting CC
cc forall a. Num a => a -> a -> a
+ SentPacket -> Int
countAckEli SentPacket
sentPacket
                }
  where
    sentBytes :: Int
sentBytes = SentPacket -> Int
spSentBytes SentPacket
sentPacket

----------------------------------------------------------------

onPacketReceived :: LDCC -> EncryptionLevel -> PacketNumber -> IO ()
onPacketReceived :: LDCC -> EncryptionLevel -> Int -> IO ()
onPacketReceived LDCC
ldcc EncryptionLevel
lvl Int
pn = do
    Bool
discarded <- LDCC -> EncryptionLevel -> IO Bool
getPacketNumberSpaceDiscarded LDCC
ldcc EncryptionLevel
lvl
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless Bool
discarded forall a b. (a -> b) -> a -> b
$ LDCC -> EncryptionLevel -> Int -> IO ()
addPeerPacketNumbers LDCC
ldcc EncryptionLevel
lvl Int
pn

----------------------------------------------------------------

onAckReceived :: LDCC -> EncryptionLevel -> AckInfo -> Microseconds -> IO ()
onAckReceived :: LDCC -> EncryptionLevel -> AckInfo -> Microseconds -> IO ()
onAckReceived ldcc :: LDCC
ldcc@LDCC{Array EncryptionLevel (IORef Bool)
Array EncryptionLevel (IORef PeerPacketNumbers)
Array EncryptionLevel (IORef LossDetection)
Array EncryptionLevel (IORef SentPackets)
TVar (Maybe EncryptionLevel)
TVar TimerInfoQ
TVar CC
TVar SentPackets
IORef Bool
IORef Int
IORef (Maybe TimeoutKey)
IORef (Maybe TimerInfo)
IORef PeerPacketNumbers
IORef RTT
ConnState
PlainPacket -> IO ()
QLogger
timerInfoQ :: TVar TimerInfoQ
previousRTT1PPNs :: IORef PeerPacketNumbers
peerPacketNumbers :: Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: IORef Int
speedingUp :: IORef Bool
ptoPing :: TVar (Maybe EncryptionLevel)
lostCandidates :: TVar SentPackets
timerInfo :: IORef (Maybe TimerInfo)
timerKey :: IORef (Maybe TimeoutKey)
lossDetection :: Array EncryptionLevel (IORef LossDetection)
sentPackets :: Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: Array EncryptionLevel (IORef Bool)
recoveryCC :: TVar CC
recoveryRTT :: IORef RTT
putRetrans :: PlainPacket -> IO ()
ldccQlogger :: QLogger
ldccState :: ConnState
timerInfoQ :: LDCC -> TVar TimerInfoQ
previousRTT1PPNs :: LDCC -> IORef PeerPacketNumbers
peerPacketNumbers :: LDCC -> Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: LDCC -> IORef Int
speedingUp :: LDCC -> IORef Bool
ptoPing :: LDCC -> TVar (Maybe EncryptionLevel)
lostCandidates :: LDCC -> TVar SentPackets
timerInfo :: LDCC -> IORef (Maybe TimerInfo)
timerKey :: LDCC -> IORef (Maybe TimeoutKey)
lossDetection :: LDCC -> Array EncryptionLevel (IORef LossDetection)
sentPackets :: LDCC -> Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: LDCC -> Array EncryptionLevel (IORef Bool)
recoveryCC :: LDCC -> TVar CC
recoveryRTT :: LDCC -> IORef RTT
putRetrans :: LDCC -> PlainPacket -> IO ()
ldccQlogger :: LDCC -> QLogger
ldccState :: LDCC -> ConnState
..} EncryptionLevel
lvl ackInfo :: AckInfo
ackInfo@(AckInfo Int
largestAcked Int
_ [(Int, Int)]
_) Microseconds
ackDelay = do
    Bool
changed <- forall a b. IORef a -> (a -> (a, b)) -> IO b
atomicModifyIORef' (Array EncryptionLevel (IORef LossDetection)
lossDetection forall i e. Ix i => Array i e -> i -> e
! EncryptionLevel
lvl) LossDetection -> (LossDetection, Bool)
update
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
changed forall a b. (a -> b) -> a -> b
$ do
        let predicate :: SentPacket -> Bool
predicate = AckInfo -> Int -> Bool
fromAckInfoToPred AckInfo
ackInfo forall b c a. (b -> c) -> (a -> b) -> a -> c
. SentPacket -> Int
spPacketNumber
        LDCC
-> EncryptionLevel -> (SentPacket -> Bool) -> IO (Seq SentPacket)
releaseLostCandidates LDCC
ldcc EncryptionLevel
lvl SentPacket -> Bool
predicate forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= Seq SentPacket -> IO ()
updateCConAck
        LDCC
-> EncryptionLevel -> (SentPacket -> Bool) -> IO (Seq SentPacket)
releaseByPredicate LDCC
ldcc EncryptionLevel
lvl SentPacket -> Bool
predicate forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= Seq SentPacket -> IO ()
detectLossUpdateCC
  where
    update :: LossDetection -> (LossDetection, Bool)
update ld :: LossDetection
ld@LossDetection{Int
Maybe TimeMicrosecond
TimeMicrosecond
AckInfo
lossTime :: LossDetection -> Maybe TimeMicrosecond
previousAckInfo :: LossDetection -> AckInfo
largestAckedPacket :: LossDetection -> Int
lossTime :: Maybe TimeMicrosecond
timeOfLastAckElicitingPacket :: TimeMicrosecond
previousAckInfo :: AckInfo
largestAckedPacket :: Int
timeOfLastAckElicitingPacket :: LossDetection -> TimeMicrosecond
..} = (LossDetection
ld', Bool
changed)
      where
        ld' :: LossDetection
ld' =
            LossDetection
ld
                { largestAckedPacket :: Int
largestAckedPacket = forall a. Ord a => a -> a -> a
max Int
largestAckedPacket Int
largestAcked
                , previousAckInfo :: AckInfo
previousAckInfo = AckInfo
ackInfo
                }
        changed :: Bool
changed = AckInfo
previousAckInfo forall a. Eq a => a -> a -> Bool
/= AckInfo
ackInfo
    detectLossUpdateCC :: Seq SentPacket -> IO ()
detectLossUpdateCC Seq SentPacket
newlyAckedPackets = case forall a. Seq a -> ViewR a
Seq.viewr Seq SentPacket
newlyAckedPackets of
        ViewR SentPacket
EmptyR -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
        Seq SentPacket
_ :> SentPacket
lastPkt -> do
            -- If the largest acknowledged is newly acked and
            -- at least one ack-eliciting was newly acked, update the RTT.
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when
                ( SentPacket -> Int
spPacketNumber SentPacket
lastPkt forall a. Eq a => a -> a -> Bool
== Int
largestAcked
                    Bool -> Bool -> Bool
&& forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any SentPacket -> Bool
spAckEliciting Seq SentPacket
newlyAckedPackets
                )
                forall a b. (a -> b) -> a -> b
$ do
                    Microseconds
rtt <- TimeMicrosecond -> IO Microseconds
getElapsedTimeMicrosecond forall a b. (a -> b) -> a -> b
$ SentPacket -> TimeMicrosecond
spTimeSent SentPacket
lastPkt
                    let latestRtt :: Microseconds
latestRtt = forall a. Ord a => a -> a -> a
max Microseconds
rtt Microseconds
kGranularity
                    LDCC -> EncryptionLevel -> Microseconds -> Microseconds -> IO ()
updateRTT LDCC
ldcc EncryptionLevel
lvl Microseconds
latestRtt Microseconds
ackDelay

            {- fimxe
            -- Process ECN information if present.
            if (ACK frame contains ECN information):
               ProcessECN(ack, lvl)
            -}

            Seq SentPacket
lostPackets <- LDCC -> EncryptionLevel -> IO (Seq SentPacket)
detectAndRemoveLostPackets LDCC
ldcc EncryptionLevel
lvl
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (forall (t :: * -> *) a. Foldable t => t a -> Bool
null Seq SentPacket
lostPackets) forall a b. (a -> b) -> a -> b
$ do
                CCMode
mode <- CC -> CCMode
ccMode forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall (m :: * -> *) a. MonadIO m => TVar a -> m a
readTVarIO TVar CC
recoveryCC
                if EncryptionLevel
lvl forall a. Eq a => a -> a -> Bool
== EncryptionLevel
RTT1Level Bool -> Bool -> Bool
&& CCMode
mode forall a. Eq a => a -> a -> Bool
/= CCMode
SlowStart
                    then LDCC -> Seq SentPacket -> IO ()
mergeLostCandidates LDCC
ldcc Seq SentPacket
lostPackets
                    else do
                        -- just in case
                        Seq SentPacket
lostPackets' <- LDCC -> Seq SentPacket -> IO (Seq SentPacket)
mergeLostCandidatesAndClear LDCC
ldcc Seq SentPacket
lostPackets
                        LDCC -> Seq SentPacket -> IO ()
onPacketsLost LDCC
ldcc Seq SentPacket
lostPackets'
                        LDCC -> Seq SentPacket -> IO ()
retransmit LDCC
ldcc Seq SentPacket
lostPackets'
            -- setLossDetectionTimer in updateCConAck
            Seq SentPacket -> IO ()
updateCConAck Seq SentPacket
newlyAckedPackets

    updateCConAck :: Seq SentPacket -> IO ()
updateCConAck Seq SentPacket
newlyAckedPackets
        | Seq SentPacket
newlyAckedPackets forall a. Eq a => a -> a -> Bool
== forall a. Seq a
Seq.empty = forall (m :: * -> *) a. Monad m => a -> m a
return ()
        | Bool
otherwise = do
            LDCC -> Seq SentPacket -> IO ()
onPacketsAcked LDCC
ldcc Seq SentPacket
newlyAckedPackets

            -- Sec 6.2.1. Computing PTO
            -- "The PTO backoff factor is reset when an acknowledgement is
            --  received, except in the following case. A server might
            --  take longer to respond to packets during the handshake
            --  than otherwise. To protect such a server from repeated
            --  client probes, the PTO backoff is not reset at a client
            --  that is not yet certain that the server has finished
            --  validating the client's address."
            Bool
validated <- LDCC -> IO Bool
peerCompletedAddressValidation LDCC
ldcc
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
validated forall a b. (a -> b) -> a -> b
$
                LDCC -> IO () -> IO ()
metricsUpdated LDCC
ldcc forall a b. (a -> b) -> a -> b
$
                    forall a. IORef a -> (a -> a) -> IO ()
atomicModifyIORef'' IORef RTT
recoveryRTT forall a b. (a -> b) -> a -> b
$
                        \RTT
rtt -> RTT
rtt{ptoCount :: Int
ptoCount = Int
0}

            LDCC -> EncryptionLevel -> IO ()
setLossDetectionTimer LDCC
ldcc EncryptionLevel
lvl

releaseLostCandidates
    :: LDCC -> EncryptionLevel -> (SentPacket -> Bool) -> IO (Seq SentPacket)
releaseLostCandidates :: LDCC
-> EncryptionLevel -> (SentPacket -> Bool) -> IO (Seq SentPacket)
releaseLostCandidates ldcc :: LDCC
ldcc@LDCC{Array EncryptionLevel (IORef Bool)
Array EncryptionLevel (IORef PeerPacketNumbers)
Array EncryptionLevel (IORef LossDetection)
Array EncryptionLevel (IORef SentPackets)
TVar (Maybe EncryptionLevel)
TVar TimerInfoQ
TVar CC
TVar SentPackets
IORef Bool
IORef Int
IORef (Maybe TimeoutKey)
IORef (Maybe TimerInfo)
IORef PeerPacketNumbers
IORef RTT
ConnState
PlainPacket -> IO ()
QLogger
timerInfoQ :: TVar TimerInfoQ
previousRTT1PPNs :: IORef PeerPacketNumbers
peerPacketNumbers :: Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: IORef Int
speedingUp :: IORef Bool
ptoPing :: TVar (Maybe EncryptionLevel)
lostCandidates :: TVar SentPackets
timerInfo :: IORef (Maybe TimerInfo)
timerKey :: IORef (Maybe TimeoutKey)
lossDetection :: Array EncryptionLevel (IORef LossDetection)
sentPackets :: Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: Array EncryptionLevel (IORef Bool)
recoveryCC :: TVar CC
recoveryRTT :: IORef RTT
putRetrans :: PlainPacket -> IO ()
ldccQlogger :: QLogger
ldccState :: ConnState
timerInfoQ :: LDCC -> TVar TimerInfoQ
previousRTT1PPNs :: LDCC -> IORef PeerPacketNumbers
peerPacketNumbers :: LDCC -> Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: LDCC -> IORef Int
speedingUp :: LDCC -> IORef Bool
ptoPing :: LDCC -> TVar (Maybe EncryptionLevel)
lostCandidates :: LDCC -> TVar SentPackets
timerInfo :: LDCC -> IORef (Maybe TimerInfo)
timerKey :: LDCC -> IORef (Maybe TimeoutKey)
lossDetection :: LDCC -> Array EncryptionLevel (IORef LossDetection)
sentPackets :: LDCC -> Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: LDCC -> Array EncryptionLevel (IORef Bool)
recoveryCC :: LDCC -> TVar CC
recoveryRTT :: LDCC -> IORef RTT
putRetrans :: LDCC -> PlainPacket -> IO ()
ldccQlogger :: LDCC -> QLogger
ldccState :: LDCC -> ConnState
..} EncryptionLevel
lvl SentPacket -> Bool
predicate = do
    Seq SentPacket
packets <- forall (m :: * -> *) a. MonadIO m => STM a -> m a
atomically forall a b. (a -> b) -> a -> b
$ do
        SentPackets Seq SentPacket
db <- forall a. TVar a -> STM a
readTVar TVar SentPackets
lostCandidates
        let (Seq SentPacket
pkts, Seq SentPacket
db') = forall a. (a -> Bool) -> Seq a -> (Seq a, Seq a)
Seq.partition SentPacket -> Bool
predicate Seq SentPacket
db
        forall a. TVar a -> a -> STM ()
writeTVar TVar SentPackets
lostCandidates forall a b. (a -> b) -> a -> b
$ Seq SentPacket -> SentPackets
SentPackets Seq SentPacket
db'
        forall (m :: * -> *) a. Monad m => a -> m a
return Seq SentPacket
pkts
    forall (t :: * -> *).
Foldable t =>
LDCC -> EncryptionLevel -> t SentPacket -> IO ()
removePacketNumbers LDCC
ldcc EncryptionLevel
lvl Seq SentPacket
packets
    forall (m :: * -> *) a. Monad m => a -> m a
return Seq SentPacket
packets

onPacketsAcked :: LDCC -> Seq SentPacket -> IO ()
onPacketsAcked :: LDCC -> Seq SentPacket -> IO ()
onPacketsAcked ldcc :: LDCC
ldcc@LDCC{Array EncryptionLevel (IORef Bool)
Array EncryptionLevel (IORef PeerPacketNumbers)
Array EncryptionLevel (IORef LossDetection)
Array EncryptionLevel (IORef SentPackets)
TVar (Maybe EncryptionLevel)
TVar TimerInfoQ
TVar CC
TVar SentPackets
IORef Bool
IORef Int
IORef (Maybe TimeoutKey)
IORef (Maybe TimerInfo)
IORef PeerPacketNumbers
IORef RTT
ConnState
PlainPacket -> IO ()
QLogger
timerInfoQ :: TVar TimerInfoQ
previousRTT1PPNs :: IORef PeerPacketNumbers
peerPacketNumbers :: Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: IORef Int
speedingUp :: IORef Bool
ptoPing :: TVar (Maybe EncryptionLevel)
lostCandidates :: TVar SentPackets
timerInfo :: IORef (Maybe TimerInfo)
timerKey :: IORef (Maybe TimeoutKey)
lossDetection :: Array EncryptionLevel (IORef LossDetection)
sentPackets :: Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: Array EncryptionLevel (IORef Bool)
recoveryCC :: TVar CC
recoveryRTT :: IORef RTT
putRetrans :: PlainPacket -> IO ()
ldccQlogger :: QLogger
ldccState :: ConnState
timerInfoQ :: LDCC -> TVar TimerInfoQ
previousRTT1PPNs :: LDCC -> IORef PeerPacketNumbers
peerPacketNumbers :: LDCC -> Array EncryptionLevel (IORef PeerPacketNumbers)
pktNumPersistent :: LDCC -> IORef Int
speedingUp :: LDCC -> IORef Bool
ptoPing :: LDCC -> TVar (Maybe EncryptionLevel)
lostCandidates :: LDCC -> TVar SentPackets
timerInfo :: LDCC -> IORef (Maybe TimerInfo)
timerKey :: LDCC -> IORef (Maybe TimeoutKey)
lossDetection :: LDCC -> Array EncryptionLevel (IORef LossDetection)
sentPackets :: LDCC -> Array EncryptionLevel (IORef SentPackets)
spaceDiscarded :: LDCC -> Array EncryptionLevel (IORef Bool)
recoveryCC :: LDCC -> TVar CC
recoveryRTT :: LDCC -> IORef RTT
putRetrans :: LDCC -> PlainPacket -> IO ()
ldccQlogger :: LDCC -> QLogger
ldccState :: LDCC -> ConnState
..} Seq SentPacket
ackedPackets = LDCC -> IO () -> IO ()
metricsUpdated LDCC
ldcc forall a b. (a -> b) -> a -> b
$ do
    Int
maxPktSiz <- forall a. Connector a => a -> IO Int
getMaxPacketSize LDCC
ldcc
    CC
oldcc <- forall (m :: * -> *) a. MonadIO m => TVar a -> m a
readTVarIO TVar CC
recoveryCC
    forall (m :: * -> *) a. MonadIO m => STM a -> m a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TVar a -> (a -> a) -> STM ()
modifyTVar' TVar CC
recoveryCC forall a b. (a -> b) -> a -> b
$ Int -> CC -> CC
modify Int
maxPktSiz
    CC
newcc <- forall (m :: * -> *) a. MonadIO m => TVar a -> m a
readTVarIO TVar CC
recoveryCC
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (CC -> CCMode
ccMode CC
oldcc forall a. Eq a => a -> a -> Bool
/= CC -> CCMode
ccMode CC
newcc) forall a b. (a -> b) -> a -> b
$
        forall q. KeepQlog q => q -> CCMode -> IO ()
qlogContestionStateUpdated LDCC
ldcc forall a b. (a -> b) -> a -> b
$
            CC -> CCMode
ccMode CC
newcc
  where
    modify :: Int -> CC -> CC
modify Int
maxPktSiz cc :: CC
cc@CC{Int
Maybe TimeMicrosecond
CCMode
bytesAcked :: CC -> Int
ssthresh :: CC -> Int
congestionRecoveryStartTime :: CC -> Maybe TimeMicrosecond
congestionWindow :: CC -> Int
ccMode :: CCMode
numOfAckEliciting :: Int
bytesAcked :: Int
ssthresh :: Int
congestionRecoveryStartTime :: Maybe TimeMicrosecond
congestionWindow :: Int
bytesInFlight :: Int
ccMode :: CC -> CCMode
numOfAckEliciting :: CC -> Int
bytesInFlight :: CC -> Int
..} =
        CC
cc
            { bytesInFlight :: Int
bytesInFlight = Int
bytesInFlight'
            , congestionWindow :: Int
congestionWindow = Int
congestionWindow'
            , bytesAcked :: Int
bytesAcked = Int
bytesAcked'
            , ccMode :: CCMode
ccMode = CCMode
ccMode'
            , numOfAckEliciting :: Int
numOfAckEliciting = Int
numOfAckEliciting'
            }
      where
        (Int
bytesInFlight', Int
congestionWindow', Int
bytesAcked', CCMode
ccMode', Int
numOfAckEliciting') =
            forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl'
                forall {d}.
(Int, Int, Int, d, Int)
-> SentPacket -> (Int, Int, Int, CCMode, Int)
(.+)
                (Int
bytesInFlight, Int
congestionWindow, Int
bytesAcked, CCMode
ccMode, Int
numOfAckEliciting)
                Seq SentPacket
ackedPackets
        (Int
bytes, Int
cwin, Int
acked, d
_, Int
cnt) .+ :: (Int, Int, Int, d, Int)
-> SentPacket -> (Int, Int, Int, CCMode, Int)
.+ sp :: SentPacket
sp@SentPacket{Bool
Int
TimeMicrosecond
PeerPacketNumbers
EncryptionLevel
PlainPacket
spPeerPacketNumbers :: SentPacket -> PeerPacketNumbers
spPlainPacket :: SentPacket -> PlainPacket
spAckEliciting :: Bool
spPeerPacketNumbers :: PeerPacketNumbers
spPacketNumber :: Int
spEncryptionLevel :: EncryptionLevel
spSentBytes :: Int
spTimeSent :: TimeMicrosecond
spPlainPacket :: PlainPacket
spPacketNumber :: SentPacket -> Int
spSentBytes :: SentPacket -> Int
spTimeSent :: SentPacket -> TimeMicrosecond
spAckEliciting :: SentPacket -> Bool
spEncryptionLevel :: SentPacket -> EncryptionLevel
..} = (Int
bytes', Int
cwin', Int
acked', CCMode
mode', Int
cnt')
          where
            isRecovery :: Bool
isRecovery = TimeMicrosecond -> Maybe TimeMicrosecond -> Bool
inCongestionRecovery TimeMicrosecond
spTimeSent Maybe TimeMicrosecond
congestionRecoveryStartTime
            bytes' :: Int
bytes' = Int
bytes forall a. Num a => a -> a -> a
- Int
spSentBytes
            ackedA :: Int
ackedA = Int
acked forall a. Num a => a -> a -> a
+ Int
spSentBytes
            cnt' :: Int
cnt' = Int
cnt forall a. Num a => a -> a -> a
- SentPacket -> Int
countAckEli SentPacket
sp
            (Int
cwin', Int
acked', CCMode
mode')
                -- Do not increase congestion window in recovery period.
                | Bool
isRecovery = (Int
cwin, Int
acked, CCMode
Recovery)
                -- fixme: Do not increase congestion_window if application
                -- limited or flow control limited.
                --
                -- Slow start.
                | Int
cwin forall a. Ord a => a -> a -> Bool
< Int
ssthresh = (Int
cwin forall a. Num a => a -> a -> a
+ Int
spSentBytes, Int
acked, CCMode
SlowStart)
                -- Congestion avoidance.
                -- In this implementation, maxPktSiz == spSentBytes.
                -- spSentBytes is large enough, so we don't care
                -- the roundup issue of `div`.
                | Int
ackedA forall a. Ord a => a -> a -> Bool
>= Int
cwin = (Int
cwin forall a. Num a => a -> a -> a
+ Int
maxPktSiz, Int
ackedA forall a. Num a => a -> a -> a
- Int
cwin, CCMode
Avoidance)
                | Bool
otherwise = (Int
cwin, Int
ackedA, CCMode
Avoidance)

----------------------------------------------------------------

onPacketNumberSpaceDiscarded :: LDCC -> EncryptionLevel -> IO ()
onPacketNumberSpaceDiscarded :: LDCC -> EncryptionLevel -> IO ()
onPacketNumberSpaceDiscarded LDCC
ldcc EncryptionLevel
lvl = do
    let (EncryptionLevel
lvl', LogStr
label) = case EncryptionLevel
lvl of
            EncryptionLevel
InitialLevel -> (EncryptionLevel
HandshakeLevel, LogStr
"initial")
            EncryptionLevel
_ -> (EncryptionLevel
RTT1Level, LogStr
"handshake")
    forall q. KeepQlog q => q -> Debug -> IO ()
qlogDebug LDCC
ldcc forall a b. (a -> b) -> a -> b
$ LogStr -> Debug
Debug (LogStr
label forall a. Semigroup a => a -> a -> a
<> LogStr
" discarded")
    forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ LDCC -> EncryptionLevel -> IO (Seq SentPacket)
discard LDCC
ldcc EncryptionLevel
lvl
    LDCC -> EncryptionLevel -> IO ()
setLossDetectionTimer LDCC
ldcc EncryptionLevel
lvl'