Fix version discovery (#271)

Author: ajanikow

service/local_slaves.go

@@ -77,7 +77,9 @@ func (s *Service) startLocalSlaves(wg *sync.WaitGroup, config Config, bsCfg Boot
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			slaveService.Run(s.stopPeer.ctx, slaveBsCfg, myPeers, relaunch)
+			if err := slaveService.Run(s.stopPeer.ctx, slaveBsCfg, myPeers, relaunch); err != nil {
+				s.log.Error().Str("peer", p.ID).Err(err).Msg("Unable to start one of peers")
+			}
 		}()
 	}
 }

service/version_check.go

@@ -27,6 +27,7 @@ import (
 	"context"
 	"fmt"
 	"strings"
+	"time"
 
 	driver "github.com/arangodb/go-driver"
 	"github.com/dchest/uniuri"
@@ -40,6 +41,8 @@ func (s *Service) DatabaseVersion(ctx context.Context) (driver.Version, error) {
 		d, err := s.databaseVersion(ctx)
 		if err != nil {
 			s.log.Warn().Err(err).Msg("Error while getting version")
+			time.Sleep(time.Second)
+			continue
 		}
 
 		return d, nil