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use source routes in the dht (when available)

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This commit is contained in:
Arceliar 2020-12-19 06:03:28 -06:00
parent 428789f24c
commit 0ba2ad74fe
2 changed files with 20 additions and 6 deletions
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20
src/yggdrasil/dht.go
View File

@ -28,7 +28,8 @@ type dhtInfo struct {
recv time.Time // When we last received a message
pings int // Time out if at least 3 consecutive maintenance pings drop
throttle time.Duration
dirty bool // Set to true if we've used this node in ping responses (for queries about someone other than the person doing the asking, i.e. real searches) since the last time we heard from the node
path []byte // source route the destination, learned from response rpath
dirty bool // Set to true if we've used this node in ping responses (for queries about someone other than the person doing the asking, i.e. real searches) since the last time we heard from the node
}
// Returns the *NodeID associated with dhtInfo.key, calculating it on the fly the first time or from a cache all subsequent times.
@ -91,7 +92,12 @@ func (t *dht) reconfigure() {
func (t *dht) reset() {
for _, info := range t.table {
if t.isImportant(info) {
t.ping(info, nil)
t.ping(info, nil) // This will source route if a path is already known
if info.path != nil {
// In case the source route died, but the dest coords are still OK...
info.path = nil
t.ping(info, nil)
}
}
}
t.table = make(map[crypto.NodeID]*dhtInfo)
@ -116,6 +122,9 @@ func (t *dht) lookup(nodeID *crypto.NodeID, everything bool) []*dhtInfo {
results = newRes
results = results[:dht_lookup_size]
}
for _, info := range results {
info.dirty = true
}
return results
}
@ -243,7 +252,7 @@ func (t *dht) addCallback(rq *dhtReqKey, callback func(*dhtRes)) {
// Reads a lookup response, checks that we had sent a matching request, and processes the response info.
// This mainly consists of updating the node we asked in our DHT (they responded, so we know they're still alive), and deciding if we want to do anything with their responses
func (t *dht) handleRes(res *dhtRes) {
func (t *dht) handleRes(res *dhtRes, rpath []byte) {
rq := dhtReqKey{res.Key, res.Dest}
if callbacks, isIn := t.callbacks[rq]; isIn {
for _, callback := range callbacks {
@ -259,6 +268,7 @@ func (t *dht) handleRes(res *dhtRes) {
rinfo := dhtInfo{
key: res.Key,
coords: res.Coords,
path: switch_reverseCoordBytes(rpath),
}
if t.isImportant(&rinfo) {
t.insert(&rinfo)
@ -290,6 +300,10 @@ func (t *dht) sendReq(req *dhtReq, dest *dhtInfo) {
Nonce: *nonce,
Payload: payload,
}
if dest.path != nil {
p.Coords = append([]byte{0}, dest.path...)
p.Offset += 1
}
packet := p.encode()
t.router.out(packet)
rq := dhtReqKey{dest.key, req.Dest}

6
src/yggdrasil/router.go
View File

@ -206,7 +206,7 @@ func (r *router) _handleProto(packet []byte) {
case wire_DHTLookupRequest:
r._handleDHTReq(bs, &p.FromKey, p.RPath)
case wire_DHTLookupResponse:
r._handleDHTRes(bs, &p.FromKey)
r._handleDHTRes(bs, &p.FromKey, p.RPath)
default:
}
}
@ -237,13 +237,13 @@ func (r *router) _handleDHTReq(bs []byte, fromKey *crypto.BoxPubKey, rpath []byt
}
// Decodes dht responses and passes them to dht.handleRes to update the DHT table and further pass them to the search code (if applicable).
func (r *router) _handleDHTRes(bs []byte, fromKey *crypto.BoxPubKey) {
func (r *router) _handleDHTRes(bs []byte, fromKey *crypto.BoxPubKey, rpath []byte) {
res := dhtRes{}
if !res.decode(bs) {
return
}
res.Key = *fromKey
r.dht.handleRes(&res)
r.dht.handleRes(&res, rpath)
}
// Decodes nodeinfo request