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This commit is contained in:
Arceliar 2019-08-26 18:37:38 -05:00
parent f432875d87
commit 4d9c6342a7
1 changed files with 45 additions and 46 deletions
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91
src/yggdrasil/link.go
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@ -46,23 +46,23 @@ type linkInterfaceMsgIO interface {
}
type linkInterface struct {
name string
link *link
peer *peer
msgIO linkInterfaceMsgIO
info linkInfo
incoming bool
force bool
closed chan struct{}
reader linkReader // Reads packets, notifies this linkInterface, passes packets to switch
writer linkWriter // Writes packets, notifies this linkInterface
phony.Inbox // Protects the below
sendTimer *time.Timer // Fires to signal that sending is blocked
stallTimer *time.Timer // Fires to signal that no incoming traffic (including keep-alive) has been seen
recvTimer *time.Timer // Fires to send keep-alive traffic
closeTimer *time.Timer // Fires when the link has been idle so long we need to close it
inSwitch bool // True if the switch is tracking this link
stalled bool // True if we haven't been receiving any response traffic
name string
link *link
peer *peer
msgIO linkInterfaceMsgIO
info linkInfo
incoming bool
force bool
closed chan struct{}
reader linkReader // Reads packets, notifies this linkInterface, passes packets to switch
writer linkWriter // Writes packets, notifies this linkInterface
phony.Inbox // Protects the below
sendTimer *time.Timer // Fires to signal that sending is blocked
keepAliveTimer *time.Timer // Fires to send keep-alive traffic
stallTimer *time.Timer // Fires to signal that no incoming traffic (including keep-alive) has been seen
closeTimer *time.Timer // Fires when the link has been idle so long we need to close it
inSwitch bool // True if the switch is tracking this link
stalled bool // True if we haven't been receiving any response traffic
}
func (l *link) init(c *Core) error {
@ -243,36 +243,34 @@ func (intf *linkInterface) handler() error {
////////////////////////////////////////////////////////////////////////////////
const (
sendBlockedTime = time.Second // How long to wait before deciding a send is blocked
keepAliveTime = 2 * time.Second // How long to wait before sending a keep-alive response if we have no real traffic to send
stallTime = 6 * time.Second // How long to wait for response traffic before deciding the connection has stalled
closeTime = 2 * switch_timeout // How long to wait before closing the link
sendTime = 1 * time.Second // How long to wait before deciding a send is blocked
keepAliveTime = 2 * time.Second // How long to wait before sending a keep-alive response if we have no real traffic to send
stallTime = 6 * time.Second // How long to wait for response traffic before deciding the connection has stalled
closeTime = 2 * switch_timeout // How long to wait before closing the link
)
// notify the intf that we're currently sending
func (intf *linkInterface) notifySending(size int, isLinkTraffic bool) {
intf.RecvFrom(nil, func() {
intf.RecvFrom(&intf.writer, func() {
if !isLinkTraffic {
intf.inSwitch = false
}
intf.sendTimer = time.AfterFunc(sendBlockedTime, intf.notifyBlockedSend)
intf._cancelRecvTimer()
intf.sendTimer = time.AfterFunc(sendTime, intf.notifyBlockedSend)
intf._cancelStallTimer()
})
}
// we just sent something, so cancel any pending timer to send keep-alive traffic
func (intf *linkInterface) _cancelRecvTimer() {
intf.RecvFrom(nil, func() {
if intf.recvTimer != nil {
intf.recvTimer.Stop()
intf.recvTimer = nil
}
})
func (intf *linkInterface) _cancelStallTimer() {
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
}
}
// called by an AfterFunc if we appear to have timed out
func (intf *linkInterface) notifyBlockedSend() {
intf.RecvFrom(nil, func() {
intf.RecvFrom(nil, func() { // Sent from a time.AfterFunc
if intf.sendTimer != nil {
//As far as we know, we're still trying to send, and the timer fired.
intf.link.core.switchTable.blockPeer(intf.peer.port)
@ -282,7 +280,7 @@ func (intf *linkInterface) notifyBlockedSend() {
// notify the intf that we've finished sending, returning the peer to the switch
func (intf *linkInterface) notifySent(size int, isLinkTraffic bool) {
intf.RecvFrom(nil, func() {
intf.RecvFrom(&intf.writer, func() {
intf.sendTimer.Stop()
intf.sendTimer = nil
if !isLinkTraffic {
@ -306,8 +304,9 @@ func (intf *linkInterface) _notifySwitch() {
// Set the peer as stalled, to prevent them from returning to the switch until a read succeeds
func (intf *linkInterface) notifyStalled() {
intf.RecvFrom(nil, func() {
intf.RecvFrom(nil, func() { // Sent from a time.AfterFunc
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
intf.stalled = true
intf.link.core.switchTable.blockPeer(intf.peer.port)
@ -316,8 +315,8 @@ func (intf *linkInterface) notifyStalled() {
}
// reset the close timer
func (intf *linkInterface) notifyReading(from phony.Actor) {
intf.RecvFrom(from, func() {
func (intf *linkInterface) notifyReading() {
intf.RecvFrom(&intf.reader, func() {
if intf.closeTimer != nil {
intf.closeTimer.Stop()
}
@ -326,26 +325,26 @@ func (intf *linkInterface) notifyReading(from phony.Actor) {
}
// wake up the link if it was stalled, and (if size > 0) prepare to send keep-alive traffic
func (intf *linkInterface) notifyReadFrom(from phony.Actor, size int) {
intf.RecvFrom(from, func() {
func (intf *linkInterface) notifyRead(size int) {
intf.RecvFrom(&intf.reader, func() {
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
}
intf.stalled = false
intf._notifySwitch()
if size > 0 && intf.recvTimer == nil {
intf.recvTimer = time.AfterFunc(keepAliveTime, intf.notifyDoKeepAlive)
if size > 0 && intf.stallTimer == nil {
intf.stallTimer = time.AfterFunc(keepAliveTime, intf.notifyDoKeepAlive)
}
})
}
// We need to send keep-alive traffic now
func (intf *linkInterface) notifyDoKeepAlive() {
intf.RecvFrom(nil, func() {
if intf.recvTimer != nil {
intf.recvTimer.Stop()
intf.recvTimer = nil
intf.RecvFrom(nil, func() { // Sent from a time.AfterFunc
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
intf.writer.sendFrom(nil, [][]byte{nil}, true) // Empty keep-alive traffic
}
})
@ -383,9 +382,9 @@ type linkReader struct {
}
func (r *linkReader) _read() {
r.intf.notifyReading(r)
r.intf.notifyReading()
msg, err := r.intf.msgIO.readMsg()
r.intf.notifyReadFrom(r, len(msg))
r.intf.notifyRead(len(msg))
if len(msg) > 0 {
r.intf.peer.handlePacketFrom(r, msg)
}