TUN-3593: /ready endpoint for k8s readiness. Move tunnel events out of UI package, into connection package.

connection/event.go

@@ -0,0 +1,25 @@
+package connection
+
+// Event is something that happened to a connection, e.g. disconnection or registration.
+type Event struct {
+	Index     uint8
+	EventType Status
+	Location  string
+	URL       string
+}
+
+// Status is the status of a connection.
+type Status int
+
+const (
+	// Disconnected means the connection to the edge was broken.
+	Disconnected Status = iota
+	// Connected means the connection to the edge was successfully established.
+	Connected
+	// Reconnecting means the connection to the edge is being re-established.
+	Reconnecting
+	// SetURL means this connection's tunnel was given a URL by the edge. Used for free tunnels.
+	SetURL
+	// RegisteringTunnel means the non-named tunnel is registering its connection.
+	RegisteringTunnel
+)