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chanfitness: Add channel event store

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This commit adds a channel event store to the channel fitness
package which is used to manage tracking of a node's channels.
It adds tracking for channel open/closed and peer online/offline
events for all channels that a node has open.

Events are consumed from channelNotifier and peerNotifier event
subscriptions. If either of these subscriptions is cancelled,
channel scoring stops, because both subscriptions are expected
to run until node shutdown.

Two functions are exposed to allow external callers to get uptime
information about a channel. GetLifespan returns the period over
which the channel has been monitored. GetUptime returns the channel's
uptime over a specified period. Callers can use these functions to
get the channel's remote peer uptime over its entire lifetime, or
a subset of that period.
This commit is contained in:
carla
2019-08-08 13:39:38 -04:00
parent 744876003d
commit 1e86589bee
5 changed files with 878 additions and 1 deletions
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6
channelnotifier/channelnotifier.go
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@@ -73,7 +73,11 @@ func (c *ChannelNotifier) Stop() {
}
// SubscribeChannelEvents returns a subscribe.Client that will receive updates
// any time the Server is made aware of a new event.
// any time the Server is made aware of a new event. The subscription provides
// channel events from the point of subscription onwards.
//
// TODO(carlaKC): update to allow subscriptions to specify a block height from
// which we would like to subscribe to events.
func (c *ChannelNotifier) SubscribeChannelEvents() (*subscribe.Client, error) {
return c.ntfnServer.Subscribe()
}