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routing: don't re-validate a channel update's edge if it already exists

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By avoiding re-validating the channel edge, we avoid wasted network
bandwidth and queries.
This commit is contained in:
Olaoluwa Osuntokun 2017-08-21 23:58:38 -07:00
parent b069406d1e
commit bc4ad34190
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GPG Key ID: 9CC5B105D03521A2
1 changed files with 20 additions and 13 deletions
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21
routing/router.go
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@ -674,7 +674,9 @@ func (r *ChannelRouter) processUpdate(msg interface{}) error {
case *channeldb.ChannelEdgePolicy:
channelID := lnwire.NewShortChanIDFromInt(msg.ChannelID)
edge1Timestamp, edge2Timestamp, _, err := r.cfg.Graph.HasChannelEdge(msg.ChannelID)
edge1Timestamp, edge2Timestamp, exists, err := r.cfg.Graph.HasChannelEdge(
msg.ChannelID,
)
if err != nil && err != channeldb.ErrGraphNoEdgesFound {
return errors.Errorf("unable to check for edge "+
"existence: %v", err)
@ -710,19 +712,24 @@ func (r *ChannelRouter) processUpdate(msg interface{}) error {
}
}
// Before we can update the channel information, we'll ensure
// that the target channel is still open by querying the
// utxo-set for its existence.
if !exists {
// Before we can update the channel information, we'll
// ensure that the target channel is still open by
// querying the utxo-set for its existence.
chanPoint, err := r.fetchChanPoint(&channelID)
if err != nil {
return errors.Errorf("unable to fetch chan point for "+
"chan_id=%v: %v", msg.ChannelID, err)
return errors.Errorf("unable to fetch chan "+
"point for chan_id=%v: %v",
msg.ChannelID, err)
}
_, err = r.cfg.Chain.GetUtxo(chanPoint, channelID.BlockHeight)
_, err = r.cfg.Chain.GetUtxo(
chanPoint, channelID.BlockHeight,
)
if err != nil {
return errors.Errorf("unable to fetch utxo for "+
"chan_id=%v: %v", msg.ChannelID, err)
}
}
// Now that we know this isn't a stale update, we'll apply the
// new edge policy to the proper directional edge within the