add debug server to activitylog & check web availability

Signed-off-by: Christian Richter <crichter@owncloud.com>

services/web/pkg/server/debug/server.go

@@ -1,6 +1,9 @@
 package debug
 
 import (
+	"context"
+	"fmt"
+	"net"
 	"net/http"
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
@@ -14,7 +17,20 @@ func Server(opts ...Option) (*http.Server, error) {
 
 	checkHandler := handlers.NewCheckHandler(
 		handlers.NewCheckHandlerConfiguration().
-			WithLogger(options.Logger),
+			WithLogger(options.Logger).WithCheck("web reachability", func(ctx context.Context) error {
+			conn, err := net.Dial("tcp", options.Config.HTTP.Addr)
+			defer func(conn net.Conn) {
+				err := conn.Close()
+				if err != nil {
+					return
+				}
+			}(conn)
+			if err != nil {
+				return fmt.Errorf("could not connect to web server: %v", err)
+			}
+
+			return nil
+		}),
 	)
 
 	return debug.NewService(