yggdrasil-network/yggdrasil-go
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cleanup

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This commit is contained in:
Arceliar 2018-06-23 23:55:27 -05:00
parent 0ad801bcfe
commit 189628b381
2 changed files with 37 additions and 53 deletions
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37
src/yggdrasil/debug.go
View file

@ -141,7 +141,42 @@ func (l *switchLocator) DEBUG_getCoords() []byte {
}
func (c *Core) DEBUG_switchLookup(dest []byte) switchPort {
return c.switchTable.lookup(dest)
return c.switchTable.DEBUG_lookup(dest)
}
// This does the switch layer lookups that decide how to route traffic.
// Traffic uses greedy routing in a metric space, where the metric distance between nodes is equal to the distance between them on the tree.
// Traffic must be routed to a node that is closer to the destination via the metric space distance.
// In the event that two nodes are equally close, it gets routed to the one with the longest uptime (due to the order that things are iterated over).
// The size of the outgoing packet queue is added to a node's tree distance when the cost of forwarding to a node, subject to the constraint that the real tree distance puts them closer to the destination than ourself.
// Doing so adds a limited form of backpressure routing, based on local information, which allows us to forward traffic around *local* bottlenecks, provided that another greedy path exists.
func (t *switchTable) DEBUG_lookup(dest []byte) switchPort {
table := t.getTable()
myDist := table.self.dist(dest)
if myDist == 0 {
return 0
}
// cost is in units of (expected distance) + (expected queue size), where expected distance is used as an approximation of the minimum backpressure gradient needed for packets to flow
ports := t.core.peers.getPorts()
var best switchPort
bestCost := int64(^uint64(0) >> 1)
for _, info := range table.elems {
dist := info.locator.dist(dest)
if !(dist < myDist) {
continue
}
//p, isIn := ports[info.port]
_, isIn := ports[info.port]
if !isIn {
continue
}
cost := int64(dist) // + p.getQueueSize()
if cost < bestCost {
best = info.port
bestCost = cost
}
}
return best
}
/*

53
src/yggdrasil/switch.go
View file

@ -482,41 +482,6 @@ func (t *switchTable) getTable() lookupTable {
return t.table.Load().(lookupTable)
}
// This does the switch layer lookups that decide how to route traffic.
// Traffic uses greedy routing in a metric space, where the metric distance between nodes is equal to the distance between them on the tree.
// Traffic must be routed to a node that is closer to the destination via the metric space distance.
// In the event that two nodes are equally close, it gets routed to the one with the longest uptime (due to the order that things are iterated over).
// The size of the outgoing packet queue is added to a node's tree distance when the cost of forwarding to a node, subject to the constraint that the real tree distance puts them closer to the destination than ourself.
// Doing so adds a limited form of backpressure routing, based on local information, which allows us to forward traffic around *local* bottlenecks, provided that another greedy path exists.
func (t *switchTable) lookup(dest []byte) switchPort {
table := t.getTable()
myDist := table.self.dist(dest)
if myDist == 0 {
return 0
}
// cost is in units of (expected distance) + (expected queue size), where expected distance is used as an approximation of the minimum backpressure gradient needed for packets to flow
ports := t.core.peers.getPorts()
var best switchPort
bestCost := int64(^uint64(0) >> 1)
for _, info := range table.elems {
dist := info.locator.dist(dest)
if !(dist < myDist) {
continue
}
//p, isIn := ports[info.port]
_, isIn := ports[info.port]
if !isIn {
continue
}
cost := int64(dist) // + p.getQueueSize()
if cost < bestCost {
best = info.port
bestCost = cost
}
}
return best
}
// Starts the switch worker
func (t *switchTable) start() error {
t.core.log.Println("Starting switch")
@ -524,23 +489,6 @@ func (t *switchTable) start() error {
return nil
}
func (t *switchTable) handleIn_old(packet []byte) {
// Get the coords, skipping the first byte (the pType)
_, pTypeLen := wire_decode_uint64(packet)
coords, coordLen := wire_decode_coords(packet[pTypeLen:])
if coordLen >= len(packet) {
util_putBytes(packet)
return
} // No payload
toPort := t.lookup(coords)
to := t.core.peers.getPorts()[toPort]
if to == nil {
util_putBytes(packet)
return
}
to.sendPacket(packet)
}
// Check if a packet should go to the self node
// This means there's no node closer to the destination than us
// This is mainly used to identify packets addressed to us, or that hit a blackhole
@ -585,6 +533,7 @@ func (t *switchTable) handleIn(packet []byte, idle map[switchPort]struct{}) bool
} // No payload
ports := t.core.peers.getPorts()
if t.selfIsClosest(coords) {
// TODO? call the router directly, and remove the whole concept of a self peer?
ports[0].sendPacket(packet)
return true
}