better error messages (#159)

pkg/service/ipam-service.go

@@ -132,18 +132,23 @@ func (i *IPAMService) AcquireChildPrefix(ctx context.Context, req *connect.Reque
 	if req.Msg.GetNamespace() != "" {
 		ctx = goipam.NewContextWithNamespace(ctx, req.Msg.GetNamespace())
 	}
-	var resp *goipam.Prefix
-	var err error
+	var (
+		resp       *goipam.Prefix
+		err        error
+		parentCidr = req.Msg.GetCidr()
+		childCidr  = req.Msg.GetChildCidr()
+		length     = req.Msg.GetLength()
+	)
 	if req.Msg.GetChildCidr() != "" {
-		resp, err = i.ipamer.AcquireSpecificChildPrefix(ctx, req.Msg.GetCidr(), req.Msg.GetChildCidr())
+		resp, err = i.ipamer.AcquireSpecificChildPrefix(ctx, parentCidr, childCidr)
 		if err != nil {
-			i.log.Error("acquirechildprefix", "error", err)
+			i.log.Error("acquirechildprefix", "parent cidr", parentCidr, "child cidr", childCidr, "length", length, "error", err)
 			return nil, connect.NewError(connect.CodeInvalidArgument, err)
 		}
 	} else {
-		resp, err = i.ipamer.AcquireChildPrefix(ctx, req.Msg.GetCidr(), uint8(req.Msg.GetLength()))
+		resp, err = i.ipamer.AcquireChildPrefix(ctx, parentCidr, uint8(length))
 		if err != nil {
-			i.log.Error("acquirechildprefix", "error", err)
+			i.log.Error("acquirechildprefix", "parent cidr", parentCidr, "length", length, "error", err)
 			return nil, connect.NewError(connect.CodeInvalidArgument, err)
 		}
 	}

prefix.go

@@ -196,12 +196,12 @@ func (i *ipamer) acquireChildPrefixInternal(ctx context.Context, namespace, pare
 	}
 	ipprefix, err := netip.ParsePrefix(parent.Cidr)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("unable to parse parent.cidr:%s of parentCidr:%s %w", parent.Cidr, parentCidr, err)
 	}
 	if specificChildRequest {
 		childprefix, err = netip.ParsePrefix(childCidr)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("unable to parse childCidr:%s %w", childCidr, err)
 		}
 		length = childprefix.Bits()
 	}
@@ -259,6 +259,11 @@ func (i *ipamer) acquireChildPrefixInternal(ctx context.Context, namespace, pare
 		cp = childprefix
 	}
 
+	// Ensure acquired child prefix is valid
+	if !cp.IsValid() {
+		return nil, fmt.Errorf("acquired child prefix:%s is not valid", cp.String())
+	}
+
 	child := &Prefix{
 		Cidr:       cp.String(),
 		ParentCidr: parentCidr,