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htlcswitch: add new UpdateForwardingPolicies method

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This commit adds a new method to the HtlcSwitch:
UpdateForwardingPolicies. With this method callers are now able to
modify the forwarding policies of all, or some currently active links.
We also make a slight modification to the way that forwarding policy
updates are handled within the links themselves to ensure that we don’t
override with a zero value for any of the fields.
This commit is contained in:
Olaoluwa Osuntokun
2017-08-21 23:50:12 -07:00
parent 5301da790c
commit 4d92d23762
2 changed files with 97 additions and 2 deletions
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24
htlcswitch/link.go
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@@ -423,7 +423,23 @@ out:
case *getBandwidthCmd:
req.resp <- l.getBandwidth()
case *policyUpdate:
l.cfg.FwrdingPolicy = req.policy
// In order to avoid overriding a valid policy
// with a "null" field in the new policy, we'll
// only update to the set sub policy if the new
// value isn't uninitialized.
if req.policy.MinHTLC != 0 {
l.cfg.FwrdingPolicy.MinHTLC = req.policy.MinHTLC
}
if req.policy.BaseFee != 0 {
l.cfg.FwrdingPolicy.BaseFee = req.policy.BaseFee
}
if req.policy.FeeRate != 0 {
l.cfg.FwrdingPolicy.FeeRate = req.policy.FeeRate
}
if req.policy.TimeLockDelta != 0 {
l.cfg.FwrdingPolicy.TimeLockDelta = req.policy.TimeLockDelta
}
if req.done != nil {
close(req.done)
}
@@ -862,7 +878,10 @@ type policyUpdate struct {
// UpdateForwardingPolicy updates the forwarding policy for the target
// ChannelLink. Once updated, the link will use the new forwarding policy to
// govern if it an incoming HTLC should be forwarded or not.
// govern if it an incoming HTLC should be forwarded or not. Note that this
// processing of the new policy will ensure that uninitialized fields in the
// passed policy won't override already initialized fields in the current
// policy.
//
// NOTE: Part of the ChannelLink interface.
func (l *channelLink) UpdateForwardingPolicy(newPolicy ForwardingPolicy) {
@@ -887,6 +906,7 @@ func (l *channelLink) UpdateForwardingPolicy(newPolicy ForwardingPolicy) {
// NOTE: Part of the ChannelLink interface.
func (l *channelLink) Stats() (uint64, lnwire.MilliSatoshi, lnwire.MilliSatoshi) {
snapshot := l.channel.StateSnapshot()
return snapshot.NumUpdates,
snapshot.TotalMilliSatoshisSent,
snapshot.TotalMilliSatoshisReceived