mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-12-23 07:35:39 +00:00
commit
a101fc0556
@ -131,7 +131,7 @@ func (c *Conn) search() error {
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}
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}
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sinfo := c.core.router.searches.newIterSearch(c.nodeID, c.nodeMask, searchCompleted)
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sinfo.continueSearch()
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sinfo.startSearch()
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} else {
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err = errors.New("search already exists")
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close(done)
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@ -155,7 +155,7 @@ func (c *Conn) doSearch() {
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sinfo = c.core.router.searches.newIterSearch(c.nodeID, c.nodeMask, searchCompleted)
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c.core.log.Debugf("%s DHT search started: %p", c.String(), sinfo)
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// Start the search
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sinfo.continueSearch()
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sinfo.startSearch()
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}
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}
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c.core.router.Act(c.session, routerWork)
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@ -65,12 +65,15 @@ func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.
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// DialByNodeIDandMask opens a session to the given node based on raw
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// NodeID parameters. If ctx is nil or has no timeout, then a default timeout of 6 seconds will apply, beginning *after* the search finishes.
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func (d *Dialer) DialByNodeIDandMask(ctx context.Context, nodeID, nodeMask *crypto.NodeID) (net.Conn, error) {
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startDial := time.Now()
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conn := newConn(d.core, nodeID, nodeMask, nil)
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if err := conn.search(); err != nil {
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// TODO: make searches take a context, so they can be cancelled early
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conn.Close()
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return nil, err
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}
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endSearch := time.Now()
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d.core.log.Debugln("Dial searched for:", nodeID, "in time:", endSearch.Sub(startDial))
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conn.session.setConn(nil, conn)
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var cancel context.CancelFunc
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if ctx == nil {
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@ -80,6 +83,9 @@ func (d *Dialer) DialByNodeIDandMask(ctx context.Context, nodeID, nodeMask *cryp
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defer cancel()
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select {
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case <-conn.session.init:
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endInit := time.Now()
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d.core.log.Debugln("Dial initialized session for:", nodeID, "in time:", endInit.Sub(endSearch))
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d.core.log.Debugln("Finished dial for:", nodeID, "in time:", endInit.Sub(startDial))
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return conn, nil
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case <-ctx.Done():
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conn.Close()
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@ -22,9 +22,6 @@ import (
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"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
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)
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// This defines the maximum number of dhtInfo that we keep track of for nodes to query in an ongoing search.
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const search_MAX_SEARCH_SIZE = 16
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// This defines the time after which we time out a search (so it can restart).
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const search_RETRY_TIME = 3 * time.Second
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const search_STEP_TIME = 100 * time.Millisecond
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@ -36,7 +33,6 @@ type searchInfo struct {
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dest crypto.NodeID
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mask crypto.NodeID
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time time.Time
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toVisit []*dhtInfo
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visited crypto.NodeID // Closest address visited so far
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callback func(*sessionInfo, error)
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// TODO context.Context for timeout and cancellation
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@ -79,57 +75,26 @@ func (s *searches) createSearch(dest *crypto.NodeID, mask *crypto.NodeID, callba
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// If there is, it adds the response info to the search and triggers a new search step.
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// If there's no ongoing search, or we if the dhtRes finished the search (it was from the target node), then don't do anything more.
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func (sinfo *searchInfo) handleDHTRes(res *dhtRes) {
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old := sinfo.visited
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if res != nil {
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sinfo.recv++
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if sinfo.checkDHTRes(res) {
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return // Search finished successfully
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}
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// Add results to the search
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sinfo.addToSearch(res)
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}
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if res == nil || sinfo.visited != old {
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// Continue the search
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sinfo.doSearchStep()
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}
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}
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// Adds the information from a dhtRes to an ongoing search.
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// Info about a node that has already been visited is not re-added to the search.
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func (sinfo *searchInfo) addToSearch(res *dhtRes) {
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// Add to search
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for _, info := range res.Infos {
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sinfo.toVisit = append(sinfo.toVisit, info)
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}
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// Sort
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sort.SliceStable(sinfo.toVisit, func(i, j int) bool {
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// Should return true if i is closer to the destination than j
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return dht_ordered(&sinfo.dest, sinfo.toVisit[i].getNodeID(), sinfo.toVisit[j].getNodeID())
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})
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// Remove anything too far away
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for idx, info := range sinfo.toVisit {
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if *info.getNodeID() == sinfo.visited || !dht_ordered(&sinfo.dest, info.getNodeID(), &sinfo.visited) {
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sinfo.toVisit = sinfo.toVisit[:idx]
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break
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// Use results to start an additional search thread
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infos := append([]*dhtInfo(nil), res.Infos...)
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infos = sinfo.getAllowedInfos(infos)
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if len(infos) > 0 {
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sinfo.continueSearch(infos)
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}
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}
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}
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// If there are no nodes left toVisit, then this cleans up the search.
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// If there has been no response in too long, then this cleans up the search.
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// Otherwise, it pops the closest node to the destination (in keyspace) off of the toVisit list and sends a dht ping.
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func (sinfo *searchInfo) doSearchStep() {
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if len(sinfo.toVisit) == 0 {
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if time.Since(sinfo.time) > search_RETRY_TIME {
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// Dead end and no response in too long, do cleanup
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delete(sinfo.searches.searches, sinfo.dest)
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sinfo.callback(nil, errors.New("search reached dead end"))
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}
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return
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}
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// Send to the next search target
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if len(sinfo.toVisit) > 0 {
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next := sinfo.toVisit[0]
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sinfo.toVisit = sinfo.toVisit[1:]
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func (sinfo *searchInfo) doSearchStep(infos []*dhtInfo) {
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if len(infos) > 0 {
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// Send to the next search target
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next := infos[0]
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rq := dhtReqKey{next.key, sinfo.dest}
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sinfo.searches.router.dht.addCallback(&rq, sinfo.handleDHTRes)
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sinfo.searches.router.dht.ping(next, &sinfo.dest)
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@ -137,13 +102,29 @@ func (sinfo *searchInfo) doSearchStep() {
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}
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}
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// If we've recently sent a ping for this search, do nothing.
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// Otherwise, doSearchStep and schedule another continueSearch to happen after search_RETRY_TIME.
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func (sinfo *searchInfo) continueSearch() {
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sinfo.doSearchStep()
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// In case the search dies, try to spawn another thread later
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// Note that this will spawn multiple parallel searches as time passes
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// Any that die aren't restarted, but a new one will start later
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// Get a list of search targets that are close enough to the destination to try
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// Requires an initial list as input
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func (sinfo *searchInfo) getAllowedInfos(infos []*dhtInfo) []*dhtInfo {
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sort.SliceStable(infos, func(i, j int) bool {
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// Should return true if i is closer to the destination than j
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return dht_ordered(&sinfo.dest, infos[i].getNodeID(), infos[j].getNodeID())
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})
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// Remove anything too far away to be useful
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for idx, info := range infos {
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if !dht_ordered(&sinfo.dest, info.getNodeID(), &sinfo.visited) {
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infos = infos[:idx]
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break
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}
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}
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return infos
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}
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// Run doSearchStep and schedule another continueSearch to happen after search_RETRY_TIME.
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// Must not be called with an empty list of infos
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func (sinfo *searchInfo) continueSearch(infos []*dhtInfo) {
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sinfo.doSearchStep(infos)
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infos = infos[1:] // Remove the node we just tried
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// In case there's no response, try the next node in infos later
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time.AfterFunc(search_STEP_TIME, func() {
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sinfo.searches.router.Act(nil, func() {
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// FIXME this keeps the search alive forever if not for the searches map, fix that
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@ -151,20 +132,51 @@ func (sinfo *searchInfo) continueSearch() {
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if newSearchInfo != sinfo {
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return
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}
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sinfo.continueSearch()
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// Get good infos here instead of at the top, to make sure we can always start things off with a continueSearch call to ourself
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infos = sinfo.getAllowedInfos(infos)
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if len(infos) > 0 {
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sinfo.continueSearch(infos)
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}
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})
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})
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}
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// Initially start a search
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func (sinfo *searchInfo) startSearch() {
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loc := sinfo.searches.router.core.switchTable.getLocator()
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var infos []*dhtInfo
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infos = append(infos, &dhtInfo{
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key: sinfo.searches.router.core.boxPub,
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coords: loc.getCoords(),
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})
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// Start the search by asking ourself, useful if we're the destination
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sinfo.continueSearch(infos)
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// Start a timer to clean up the search if everything times out
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var cleanupFunc func()
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cleanupFunc = func() {
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sinfo.searches.router.Act(nil, func() {
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// FIXME this keeps the search alive forever if not for the searches map, fix that
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newSearchInfo := sinfo.searches.searches[sinfo.dest]
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if newSearchInfo != sinfo {
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return
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}
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elapsed := time.Since(sinfo.time)
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if elapsed > search_RETRY_TIME {
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// cleanup
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delete(sinfo.searches.searches, sinfo.dest)
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sinfo.callback(nil, errors.New("search reached dead end"))
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return
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}
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time.AfterFunc(search_RETRY_TIME-elapsed, cleanupFunc)
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})
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}
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time.AfterFunc(search_RETRY_TIME, cleanupFunc)
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}
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// Calls create search, and initializes the iterative search parts of the struct before returning it.
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func (s *searches) newIterSearch(dest *crypto.NodeID, mask *crypto.NodeID, callback func(*sessionInfo, error)) *searchInfo {
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sinfo := s.createSearch(dest, mask, callback)
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sinfo.visited = s.router.dht.nodeID
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loc := s.router.core.switchTable.getLocator()
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sinfo.toVisit = append(sinfo.toVisit, &dhtInfo{
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key: s.router.core.boxPub,
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coords: loc.getCoords(),
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}) // Start the search by asking ourself, useful if we're the destination
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return sinfo
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}
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@ -175,7 +187,7 @@ func (sinfo *searchInfo) checkDHTRes(res *dhtRes) bool {
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from := dhtInfo{key: res.Key, coords: res.Coords}
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if *from.getNodeID() != sinfo.visited && dht_ordered(&sinfo.dest, from.getNodeID(), &sinfo.visited) {
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// Closer to the destination, so update visited
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sinfo.searches.router.core.log.Debugln("Updating search:", sinfo.dest, *from.getNodeID(), sinfo.send, sinfo.recv)
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sinfo.searches.router.core.log.Debugln("Updating search:", &sinfo.dest, from.getNodeID(), sinfo.send, sinfo.recv)
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sinfo.visited = *from.getNodeID()
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sinfo.time = time.Now()
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}
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@ -202,7 +214,7 @@ func (sinfo *searchInfo) checkDHTRes(res *dhtRes) bool {
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}
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// Cleanup
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if _, isIn := sinfo.searches.searches[sinfo.dest]; isIn {
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sinfo.searches.router.core.log.Debugln("Finished search:", sinfo.dest, sinfo.send, sinfo.recv)
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sinfo.searches.router.core.log.Debugln("Finished search:", &sinfo.dest, sinfo.send, sinfo.recv)
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delete(sinfo.searches.searches, res.Dest)
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}
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}
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@ -43,7 +43,6 @@ type sessionInfo struct {
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time time.Time // Time we last received a packet
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mtuTime time.Time // time myMTU was last changed
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pingTime time.Time // time the first ping was sent since the last received packet
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pingSend time.Time // time the last ping was sent
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coords []byte // coords of destination
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reset bool // reset if coords change
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tstamp int64 // ATOMIC - tstamp from their last session ping, replay attack mitigation
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@ -197,7 +196,6 @@ func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
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sinfo.time = now
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sinfo.mtuTime = now
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sinfo.pingTime = now
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sinfo.pingSend = now
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sinfo.init = make(chan struct{})
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sinfo.cancel = util.NewCancellation()
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higher := false
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