package provider import "github.com/containous/traefik/pkg/types" // Constrainer Filter services by constraint, matching with Traefik tags. type Constrainer struct { Constraints types.Constraints `description:"Filter services by constraint, matching with Traefik tags." export:"true"` } // MatchConstraints must match with EVERY single constraint // returns first constraint that do not match or nil. func (c *Constrainer) MatchConstraints(tags []string) (bool, *types.Constraint) { // if there is no tags and no constraints, filtering is disabled if len(tags) == 0 && len(c.Constraints) == 0 { return true, nil } for _, constraint := range c.Constraints { // xor: if ok and constraint.MustMatch are equal, then no tag is currently matching with the constraint if ok := constraint.MatchConstraintWithAtLeastOneTag(tags); ok != constraint.MustMatch { return false, constraint } } // If no constraint or every constraints matching return true, nil }