chanevents+faraday: add chan events store and start

chanevents/chanevents.go

@@ -14,16 +14,16 @@ type EventType int16
 
 const (
 	// EventTypeUnknown is the unknown event type.
-	EventTypeUnknown = 0
+	EventTypeUnknown EventType = 0
 
 	// EventTypeOnline is the online event type.
-	EventTypeOnline = 1
+	EventTypeOnline EventType = 1
 
 	// EventTypeOffline is the offline event type.
-	EventTypeOffline = 2
+	EventTypeOffline EventType = 2
 
 	// EventTypeUpdate is the balance update event type.
-	EventTypeUpdate = 3
+	EventTypeUpdate EventType = 3
 )
 
 // String returns the string representation of the event type.
@@ -106,4 +106,8 @@ type ChannelEvent struct {
 	// RemoteBalance is the remote balance of the channel at the time of the
 	// event. This is only populated for balance update events.
 	RemoteBalance fn.Option[btcutil.Amount]
+
+	// IsSync indicates whether this event was recorded during an initial
+	// sync rather than from a live subscription.
+	IsSync bool
 }

chanevents/log.go

@@ -0,0 +1,25 @@
+package chanevents
+
+import (
+	"github.com/btcsuite/btclog/v2"
+	"github.com/lightningnetwork/lnd/build"
+)
+
+const Subsystem = "CHEV"
+
+// log is a logger that is initialized with no output filters.  This
+// means the package will not perform any logging by default until the caller
+// requests it.
+var log btclog.Logger
+
+// The default amount of logging is none.
+func init() {
+	UseLogger(build.NewSubLogger(Subsystem, nil))
+}
+
+// UseLogger uses a specified Logger to output package logging info.
+// This should be used in preference to SetLogWriter if the caller is also
+// using btclog.
+func UseLogger(logger btclog.Logger) {
+	log = logger
+}