func diff()

in pkg/controller/service/vgroups.go [227:304]
74 lines of code
32 McCabe index (conditional complexity)

func diff(reqCtx *RequestContext, remote, local model.VServerGroup) (
	[]model.BackendAttribute, []model.BackendAttribute, []model.BackendAttribute) {

	var (
		addition  []model.BackendAttribute
		deletions []model.BackendAttribute
		updates   []model.BackendAttribute
	)

	for _, r := range remote.Backends {
		if !isBackendManagedByMyService(reqCtx, r, local.VGroupName) {
			continue
		}
		found := false
		for _, l := range local.Backends {
			if l.Type == "eni" {
				if r.ServerId == l.ServerId &&
					r.ServerIp == l.ServerIp &&
					r.Port == l.Port {
					found = true
					break
				}
			} else {
				if r.ServerId == l.ServerId &&
					r.Port == l.Port {
					found = true
					break
				}
			}

		}
		if !found {
			deletions = append(deletions, r)
		}
	}
	for _, l := range local.Backends {
		found := false
		for _, r := range remote.Backends {
			if l.Type == "eni" {
				if r.ServerId == l.ServerId &&
					r.ServerIp == l.ServerIp &&
					r.Port == l.Port {
					found = true
					break
				}
			} else {
				if r.ServerId == l.ServerId &&
					r.Port == l.Port {
					found = true
					break
				}
			}

		}
		if !found {
			addition = append(addition, l)
		}
	}
	for _, l := range local.Backends {
		for _, r := range remote.Backends {
			if l.Type == "eni" {
				if l.ServerId == r.ServerId &&
					l.ServerIp == r.ServerIp &&
					(l.Port != r.Port || l.Weight != r.Weight || l.Description != r.Description) {
					updates = append(updates, l)
					break
				}
			} else {
				if l.ServerId == r.ServerId &&
					(l.Port != r.Port || l.Weight != r.Weight || l.Description != r.Description) {
					updates = append(updates, l)
					break
				}
			}
		}
	}
	return addition, deletions, updates
}