Add api command

cmd/sing-box/cmd_api_connection.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"time"
+
+	"github.com/sagernet/sing-box/daemon"
+	"github.com/sagernet/sing/common"
+
+	"github.com/spf13/cobra"
+)
+
+var commandAPIConnection = &cobra.Command{
+	Use:   "connection",
+	Short: "Manage connections",
+}
+
+func init() {
+	commandAPIRoot.AddCommand(commandAPIConnection)
+}
+
+func fetchConnections(client daemon.StartedServiceClient) ([]*daemon.Connection, error) {
+	stream, err := client.SubscribeConnections(globalCtx, &daemon.SubscribeConnectionsRequest{Interval: int64(time.Second)})
+	if err != nil {
+		return nil, err
+	}
+	events, err := stream.Recv()
+	if err != nil {
+		return nil, err
+	}
+	connections := common.FilterNotNil(common.Map(events.GetEvents(), func(it *daemon.ConnectionEvent) *daemon.Connection {
+		return it.GetConnection()
+	}))
+	common.SortBy(connections, func(it *daemon.Connection) int64 {
+		return it.GetCreatedAt()
+	})
+	return connections, nil
+}