rename network.Stat to Stats, introduce ConnStats (#226)

network/conn.go

@@ -63,5 +63,5 @@ type ConnMultiaddrs interface {
 // ConnStat is an interface mixin for connection types that provide connection statistics.
 type ConnStat interface {
 	// Stat stores metadata pertaining to this conn.
-	Stat() Stat
+	Stat() ConnStats
 }

network/network.go

@@ -96,8 +96,15 @@ func (r Reachability) String() string {
 	return str[r]
 }
 
-// Stat stores metadata pertaining to a given Stream/Conn.
-type Stat struct {
+// ConnStats stores metadata pertaining to a given Conn.
+type ConnStats struct {
+	Stats
+	// NumStreams is the number of streams on the connection.
+	NumStreams int
+}
+
+// Stats stores metadata pertaining to a given Stream / Conn.
+type Stats struct {
 	// Direction specifies whether this is an inbound or an outbound connection.
 	Direction Direction
 	// Opened is the timestamp when this connection was opened.

network/stream.go

@@ -21,7 +21,7 @@ type Stream interface {
 	SetProtocol(id protocol.ID)
 
 	// Stat returns metadata pertaining to this stream.
-	Stat() Stat
+	Stat() Stats
 
 	// Conn returns the connection this stream is part of.
 	Conn() Conn