traefik/pkg/provider/constrainer.go

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2019-03-27 14:02:06 +00:00
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
}