clean up use of log.Error where errors could be wrapped

Replace a lot of occurences of log.Error with fmt.Errorf,
bubbling the error up the chain instead.

hscontrol/db/routes.go

@@ -2,6 +2,7 @@ package db
 
 import (
 	"errors"
+	"fmt"
 	"net/netip"
 
 	"github.com/juanfont/headscale/hscontrol/policy"
@@ -252,20 +253,20 @@ func DeleteRoute(
 func deleteNodeRoutes(tx *gorm.DB, node *types.Node, isConnected types.NodeConnectedMap) ([]types.NodeID, error) {
 	routes, err := GetNodeRoutes(tx, node)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("getting node routes: %w", err)
 	}
 
 	var changed []types.NodeID
 	for i := range routes {
 		if err := tx.Unscoped().Delete(&routes[i]).Error; err != nil {
-			return nil, err
+			return nil, fmt.Errorf("deleting route(%d): %w", &routes[i].ID, err)
 		}
 
 		// TODO(kradalby): This is a bit too aggressive, we could probably
 		// figure out which routes needs to be failed over rather than all.
 		chn, err := failoverRouteTx(tx, isConnected, &routes[i])
 		if err != nil {
-			return changed, err
+			return changed, fmt.Errorf("failing over route after delete: %w", err)
 		}
 
 		if chn != nil {
@@ -410,10 +411,8 @@ func FailoverRouteIfAvailable(
 	isConnected types.NodeConnectedMap,
 	node *types.Node,
 ) (*types.StateUpdate, error) {
-	log.Debug().Caller().Uint64("node.id", node.ID.Uint64()).Msgf("ROUTE DEBUG ENTERED FAILOVER")
 	nodeRoutes, err := GetNodeRoutes(tx, node)
 	if err != nil {
-		log.Debug().Caller().Uint64("node.id", node.ID.Uint64()).Interface("nodeRoutes", nodeRoutes).Msgf("ROUTE DEBUG NO ROUTES")
 		return nil, nil
 	}
 
@@ -421,34 +420,31 @@ func FailoverRouteIfAvailable(
 	for _, nodeRoute := range nodeRoutes {
 		routes, err := getRoutesByPrefix(tx, netip.Prefix(nodeRoute.Prefix))
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("getting routes by prefix: %w", err)
 		}
 
 		for _, route := range routes {
 			if route.IsPrimary {
 				// if we have a primary route, and the node is connected
 				// nothing needs to be done.
-				log.Debug().Caller().Uint64("node.id", node.ID.Uint64()).Uint64("route.node.id", route.Node.ID.Uint64()).Msgf("ROUTE DEBUG CHECKING IF ONLINE")
 				if isConnected[route.Node.ID] {
-					log.Debug().Caller().Uint64("node.id", node.ID.Uint64()).Uint64("route.node.id", route.Node.ID.Uint64()).Msgf("ROUTE DEBUG IS ONLINE")
 					return nil, nil
 				}
 
-				log.Debug().Caller().Uint64("node.id", node.ID.Uint64()).Uint64("route.node.id", route.Node.ID.Uint64()).Msgf("ROUTE DEBUG NOT ONLINE, FAILING OVER")
 				// if not, we need to failover the route
-				changedIDs, err := failoverRouteTx(tx, isConnected, &route)
-				if err != nil {
-					return nil, err
-				}
+				failover := failoverRoute(isConnected, &route, routes)
+				if failover != nil {
+					failover.save(tx)
+					if err != nil {
+						return nil, fmt.Errorf("saving failover routes: %w", err)
+					}
 
-				if changedIDs != nil {
-					changedNodes = append(changedNodes, changedIDs...)
+					changedNodes = append(changedNodes, failover.old.Node.ID, failover.new.Node.ID)
 				}
 			}
 		}
 	}
 
-	log.Debug().Caller().Uint64("node.id", node.ID.Uint64()).Interface("changedNodes", changedNodes).Msgf("ROUTE DEBUG")
 	if len(changedNodes) != 0 {
 		return &types.StateUpdate{
 			Type:        types.StatePeerChanged,
@@ -490,7 +486,7 @@ func failoverRouteTx(
 
 	routes, err := getRoutesByPrefix(tx, netip.Prefix(r.Prefix))
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("getting routes by prefix: %w", err)
 	}
 
 	fo := failoverRoute(isConnected, r, routes)
@@ -498,18 +494,9 @@ func failoverRouteTx(
 		return nil, nil
 	}
 
-	err = tx.Save(fo.old).Error
+	err = fo.save(tx)
 	if err != nil {
-		log.Error().Err(err).Msg("disabling old primary route")
-
-		return nil, err
-	}
-
-	err = tx.Save(fo.new).Error
-	if err != nil {
-		log.Error().Err(err).Msg("saving new primary route")
-
-		return nil, err
+		return nil, fmt.Errorf("saving failover route: %w", err)
 	}
 
 	log.Trace().
@@ -525,6 +512,20 @@ type failover struct {
 	new *types.Route
 }
 
+func (f *failover) save(tx *gorm.DB) error {
+	err := tx.Save(f.old).Error
+	if err != nil {
+		return fmt.Errorf("saving old primary: %w", err)
+	}
+
+	err = tx.Save(f.new).Error
+	if err != nil {
+		return fmt.Errorf("saving new primary: %w", err)
+	}
+
+	return nil
+}
+
 func failoverRoute(
 	isConnected types.NodeConnectedMap,
 	routeToReplace *types.Route,
@@ -603,13 +604,7 @@ func EnableAutoApprovedRoutes(
 
 	routes, err := GetNodeAdvertisedRoutes(tx, node)
 	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
-		log.Error().
-			Caller().
-			Err(err).
-			Str("node", node.Hostname).
-			Msg("Could not get advertised routes for node")
-
-		return err
+		return fmt.Errorf("getting advertised routes for node(%s %d): %w", node.Hostname, node.ID, err)
 	}
 
 	log.Trace().Interface("routes", routes).Msg("routes for autoapproving")
@@ -625,12 +620,7 @@ func EnableAutoApprovedRoutes(
 			netip.Prefix(advertisedRoute.Prefix),
 		)
 		if err != nil {
-			log.Err(err).
-				Str("advertisedRoute", advertisedRoute.String()).
-				Uint64("nodeId", node.ID.Uint64()).
-				Msg("Failed to resolve autoApprovers for advertised route")
-
-			return err
+			return fmt.Errorf("failed to resolve autoApprovers for route(%d) for node(%s %d): %w", advertisedRoute.ID, node.Hostname, node.ID, err)
 		}
 
 		log.Trace().
@@ -647,11 +637,7 @@ func EnableAutoApprovedRoutes(
 				// TODO(kradalby): figure out how to get this to depend on less stuff
 				approvedIps, err := aclPolicy.ExpandAlias(types.Nodes{node}, approvedAlias)
 				if err != nil {
-					log.Err(err).
-						Str("alias", approvedAlias).
-						Msg("Failed to expand alias when processing autoApprovers policy")
-
-					return err
+					return fmt.Errorf("expanding alias %q for autoApprovers: %w", approvedAlias, err)
 				}
 
 				// approvedIPs should contain all of node's IPs if it matches the rule, so check for first
@@ -665,12 +651,7 @@ func EnableAutoApprovedRoutes(
 	for _, approvedRoute := range approvedRoutes {
 		_, err := EnableRoute(tx, uint64(approvedRoute.ID))
 		if err != nil {
-			log.Err(err).
-				Str("approvedRoute", approvedRoute.String()).
-				Uint64("nodeId", node.ID.Uint64()).
-				Msg("Failed to enable approved route")
-
-			return err
+			return fmt.Errorf("enabling approved route(%d): %w", approvedRoute.ID, err)
 		}
 	}