fix: return a proper error from Node.Join()

internal/roles/node/node.go

@@ -3,6 +3,7 @@ package node
 import (
 	"context"
 	"errors"
+	"fmt"
 	"sync"
 	"time"
 
@@ -40,25 +41,28 @@ func (r *Role) Join(bootstrap string) error {
 		return errors.New("no masters configured")
 	}
 
+	var errs []error
 	for m := range masters {
 		logger := log.With().Str("host", m).Logger()
 		logger.Debug().Msg("trying to join via master")
 
 		nodes, err := client.Post[[]types.Node](m, "/master/join", r.state.Self)
 		if err != nil {
+			errs = append(errs, err)
 			logger.Debug().Err(err).Msg("unable to join")
 			continue
 		}
 
 		if err := r.state.Registry.Set(*nodes); err != nil {
 			logger.Debug().Err(err).Msg("unable to set master's nodes")
+			errs = append(errs, err)
 			continue
 		}
 
 		return nil
 	}
 
-	return errors.New("unable to join")
+	return fmt.Errorf("unable to join with any master: %w", errors.Join(errs...))
 }
 
 func (r *Role) Leave() error {
@@ -67,7 +71,7 @@ func (r *Role) Leave() error {
 		return nil
 	}
 
-	sent := false
+	var errs []error
 	for _, m := range masters {
 		logger := log.With().Str("name", m.Hostname).Logger()
 		logger.Debug().Msg("sending leave message")
@@ -75,20 +79,16 @@ func (r *Role) Leave() error {
 		_, err := client.Post[any](m.Endpoint, types.PathMasterLeave, r.state.Self)
 		if err != nil {
 			logger.Debug().Err(err).Msg("unable to send leave message")
+			errs = append(errs, err)
 			continue
 		} else {
-			sent = true
 			logger.Debug().Msg("leave message sent")
-			break
-		}
-	}
-
-	if !sent {
-		return errors.New("unable to send leave message")
-	}
-
 			return nil
 		}
+	}
+
+	return fmt.Errorf("unable to send leave message to any master: %w", errors.Join(errs...))
+}
 
 func (r *Role) OnStartup(ctx context.Context) error {
 	if r.config.KeepaliveInterval != -1 {