cwinfo/yggdrasil-go
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start migrating switch to the actor model

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This commit is contained in:
Arceliar 2019-08-24 14:56:33 -05:00
parent b337228aa4
commit 498bc395e2
1 changed files with 47 additions and 70 deletions
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87
src/yggdrasil/switch.go
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@ -19,6 +19,8 @@ import (
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
"github.com/yggdrasil-network/yggdrasil-go/src/util"
"github.com/Arceliar/phony"
)
const (
@ -172,12 +174,13 @@ type switchTable struct {
data switchData //
updater atomic.Value // *sync.Once
table atomic.Value // lookupTable
phony.Actor // Owns the below
packetIn chan []byte // Incoming packets for the worker to handle
idleIn chan switchPort // Incoming idle notifications from peer links
admin chan func() // Pass a lambda for the admin socket to query stuff
queues switch_buffers // Queues - not atomic so ONLY use through admin chan
queueTotalMaxSize uint64 // Maximum combined size of queues
toRouter chan []byte // Packets to be sent to the router
idle map[switchPort]time.Time // idle peers
}
// Minimum allowed total size of switch queues.
@ -199,7 +202,7 @@ func (t *switchTable) init(core *Core) {
t.idleIn = make(chan switchPort, 1024)
t.admin = make(chan func())
t.queueTotalMaxSize = SwitchQueueTotalMinSize
t.toRouter = make(chan []byte, 1)
t.idle = make(map[switchPort]time.Time)
}
// Safely gets a copy of this node's locator.
@ -653,12 +656,13 @@ func (t *switchTable) bestPortForCoords(coords []byte) switchPort {
// Handle an incoming packet
// Either send it to ourself, or to the first idle peer that's free
// Returns true if the packet has been handled somehow, false if it should be queued
func (t *switchTable) handleIn(packet []byte, idle map[switchPort]time.Time) bool {
func (t *switchTable) _handleIn(packet []byte, idle map[switchPort]time.Time) bool {
coords := switch_getPacketCoords(packet)
closer := t.getCloser(coords)
if len(closer) == 0 {
// TODO? call the router directly, and remove the whole concept of a self peer?
t.toRouter <- packet
self := t.core.peers.getPorts()[0]
self.sendPacketsFrom(t, [][]byte{packet})
return true
}
var best *peer
@ -731,7 +735,7 @@ type switch_buffers struct {
closer []closerInfo // Scratch space
}
func (b *switch_buffers) cleanup(t *switchTable) {
func (b *switch_buffers) _cleanup(t *switchTable) {
for streamID, buf := range b.bufs {
// Remove queues for which we have no next hop
packet := buf.packets[0]
@ -773,14 +777,14 @@ func (b *switch_buffers) cleanup(t *switchTable) {
// Handles incoming idle notifications
// Loops over packets and sends the newest one that's OK for this peer to send
// Returns true if the peer is no longer idle, false if it should be added to the idle list
func (t *switchTable) handleIdle(port switchPort) bool {
func (t *switchTable) _handleIdle(port switchPort) bool {
to := t.core.peers.getPorts()[port]
if to == nil {
return true
}
var packets [][]byte
var psize int
t.queues.cleanup(t)
t.queues._cleanup(t)
now := time.Now()
for psize < 65535 {
var best string
@ -824,51 +828,9 @@ func (t *switchTable) handleIdle(port switchPort) bool {
return false
}
// The switch worker does routing lookups and sends packets to where they need to be
func (t *switchTable) doWorker() {
sendingToRouter := make(chan []byte, 1)
go func() {
// Keep sending packets to the router
self := t.core.peers.getPorts()[0]
for bs := range sendingToRouter {
// TODO remove this ugly mess of goroutines if/when the switch becomes an actor
<-self.SyncExec(func() { self._sendPackets([][]byte{bs}) })
}
}()
go func() {
// Keep taking packets from the idle worker and sending them to the above whenever it's idle, keeping anything extra in a (fifo, head-drop) buffer
var buf [][]byte
var size int
for {
bs := <-t.toRouter
size += len(bs)
buf = append(buf, bs)
for len(buf) > 0 {
select {
case bs := <-t.toRouter:
size += len(bs)
buf = append(buf, bs)
for size > int(t.queueTotalMaxSize) {
size -= len(buf[0])
util.PutBytes(buf[0])
buf = buf[1:]
}
case sendingToRouter <- buf[0]:
size -= len(buf[0])
buf = buf[1:]
}
}
}
}()
t.queues.switchTable = t
t.queues.bufs = make(map[string]switch_buffer) // Packets per PacketStreamID (string)
idle := make(map[switchPort]time.Time) // this is to deduplicate things
for {
//t.core.log.Debugf("Switch state: idle = %d, buffers = %d", len(idle), len(t.queues.bufs))
select {
case bytes := <-t.packetIn:
func (t *switchTable) _packetIn(bytes []byte) {
// Try to send it somewhere (or drop it if it's corrupt or at a dead end)
if !t.handleIn(bytes, idle) {
if !t._handleIn(bytes, t.idle) {
// There's nobody free to take it right now, so queue it for later
packet := switch_packetInfo{bytes, time.Now()}
streamID := switch_getPacketStreamID(packet.bytes)
@ -889,14 +851,29 @@ func (t *switchTable) doWorker() {
t.queues.maxbufs = len(t.queues.bufs)
}
}
t.queues.cleanup(t)
t.queues._cleanup(t)
}
case port := <-t.idleIn:
}
func (t *switchTable) _idleIn(port switchPort) {
// Try to find something to send to this peer
if !t.handleIdle(port) {
if !t._handleIdle(port) {
// Didn't find anything ready to send yet, so stay idle
idle[port] = time.Now()
t.idle[port] = time.Now()
}
}
// The switch worker does routing lookups and sends packets to where they need to be
func (t *switchTable) doWorker() {
t.queues.switchTable = t
t.queues.bufs = make(map[string]switch_buffer) // Packets per PacketStreamID (string)
for {
//t.core.log.Debugf("Switch state: idle = %d, buffers = %d", len(idle), len(t.queues.bufs))
select {
case bytes := <-t.packetIn:
<-t.SyncExec(func() { t._packetIn(bytes) })
case port := <-t.idleIn:
<-t.SyncExec(func() { t._idleIn(port) })
case f := <-t.admin:
f()
case e := <-t.reconfigure: