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https://github.com/cwinfo/yggdrasil-go.git
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refactor switch code so calling lookupTable.lookup does most of the important work
This commit is contained in:
Arceliar
parent
cfd8641925
commit
4809879995
@ -596,14 +596,14 @@ func (t *switchTable) getCloser(dest []byte) []closerInfo {
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// Skip the iteration step if it's impossible to be closer
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return nil
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}
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t.queues.closer = t.queues.closer[:0]
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var closer []closerInfo
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for _, info := range table.elems {
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dist := info.locator.dist(dest)
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if dist < myDist {
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t.queues.closer = append(t.queues.closer, closerInfo{info, dist})
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closer = append(closer, closerInfo{info, dist})
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}
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}
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return t.queues.closer
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return closer
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}
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// Returns true if the peer is closer to the destination than ourself
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@ -645,20 +645,41 @@ func switch_getFlowLabelFromCoords(in []byte) []byte {
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return []byte{}
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}
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// Find the best port for a given set of coords
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func (t *switchTable) bestPortForCoords(coords []byte) switchPort {
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table := t.getTable()
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var best switchPort
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bestDist := table.self.dist(coords)
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for to, elem := range table.elems {
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dist := elem.locator.dist(coords)
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if !(dist < bestDist) {
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// Find the best port to forward to for a given set of coords
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func (t *lookupTable) lookup(coords []byte) switchPort {
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var bestPort switchPort
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myDist := t.self.dist(coords)
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bestDist := myDist
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var bestElem tableElem
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for _, info := range t.elems {
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dist := info.locator.dist(coords)
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if dist >= myDist {
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continue
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}
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best = to
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bestDist = dist
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var update bool
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switch {
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case dist < bestDist:
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// Closer to destination
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update = true
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case dist > bestDist:
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// Further from destination
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case info.locator.tstamp > bestElem.locator.tstamp:
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// Newer root update
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update = true
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case info.locator.tstamp < bestElem.locator.tstamp:
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// Older root update
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case info.time.Before(bestElem.time):
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// Received root update via this peer sooner
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update = true
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default:
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}
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if update {
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bestPort = info.port
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bestDist = dist
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bestElem = info
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}
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}
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return best
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return bestPort
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}
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// Handle an incoming packet
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@ -666,57 +687,22 @@ func (t *switchTable) bestPortForCoords(coords []byte) switchPort {
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// Returns true if the packet has been handled somehow, false if it should be queued
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func (t *switchTable) _handleIn(packet []byte, idle map[switchPort]struct{}) (bool, switchPort) {
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coords := switch_getPacketCoords(packet)
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closer := t.getCloser(coords)
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var best *closerInfo
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table := t.getTable()
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port := table.lookup(coords)
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ports := t.core.peers.getPorts()
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for _, cinfo := range closer {
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to := ports[cinfo.elem.port]
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var update bool
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switch {
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case to == nil:
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// no port was found, ignore it
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case best == nil:
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// this is the first idle port we've found, so select it until we find a
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// better candidate port to use instead
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update = true
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case cinfo.dist < best.dist:
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// the port takes a shorter path/is more direct than our current
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// candidate, so select that instead
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update = true
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case cinfo.dist > best.dist:
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// the port takes a longer path/is less direct than our current candidate,
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// ignore it
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case cinfo.elem.locator.tstamp > best.elem.locator.tstamp:
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// has a newer tstamp from the root, so presumably a better path
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update = true
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case cinfo.elem.locator.tstamp < best.elem.locator.tstamp:
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// has a n older tstamp, so presumably a worse path
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case cinfo.elem.time.Before(best.elem.time):
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// same tstamp, but got it earlier, so presumably a better path
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//t.core.log.Println("DEBUG new best:", best.elem.time, cinfo.elem.time)
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update = true
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default:
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// the search for a port has finished
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}
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if update {
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b := cinfo // because cinfo gets mutated by the iteration
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best = &b
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}
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}
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if best == nil {
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// No closer peers
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// TODO? call the router directly, and remove the whole concept of a self peer?
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self := t.core.peers.getPorts()[0]
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self.sendPacketsFrom(t, [][]byte{packet})
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peer := ports[port]
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if peer == nil {
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// FIXME hack, if the peer disappeared durring a race then don't buffer
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return true, 0
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}
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if _, isIdle := idle[best.elem.port]; isIdle {
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delete(idle, best.elem.port)
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ports[best.elem.port].sendPacketsFrom(t, [][]byte{packet})
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return true, best.elem.port
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if _, isIdle := idle[port]; isIdle || port == 0 {
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// Either no closer peers, or the closest peer is idle
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delete(idle, port)
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peer.sendPacketsFrom(t, [][]byte{packet})
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return true, port
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}
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// Best node isn't idle, so return port and let the packet be buffered
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return false, best.elem.port
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// There's a closer peer, but it's not idle, so buffer it
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return false, port
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}
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// Info about a buffered packet
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@ -737,7 +723,6 @@ type switch_buffers struct {
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size uint64 // Total size of all buffers, in bytes
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maxbufs int
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maxsize uint64
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closer []closerInfo // Scratch space
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}
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func (b *switch_buffers) _cleanup(t *switchTable) {
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