cloudfoundry/stratos

package helm

import (
    "fmt"
    "strings"

    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// See: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
func podSelectorToQueryString(selector *metav1.LabelSelector) string {

    qs := "?labelSelector="
    ml := ""
    sep := ""

    // Match labels
    for k, v := range selector.MatchLabels {
        if len(ml) > 0 {
            sep = ","
        }
        ml = fmt.Sprintf("%s%s%s%%3D%s", ml, sep, k, v)
    }

    // Now add set based match expressions
    for _, v := range selector.MatchExpressions {
        if len(ml) > 0 {
            sep = ","
        }
        ml = fmt.Sprintf("%s%s%s+%s+%%28%s%%s29", ml, sep, v.Key, v.Operator, strings.Join(v.Values, "%%2C"))
    }

    if len(ml) > 0 {
        return fmt.Sprintf("%s%s", qs, ml)
    }

    return ""
}

// Check that the selectors maps contains everything in the find map
func labelsMatch(find, selectors map[string]string) bool {
    for k, v := range find {
        if sv, ok := selectors[k]; ok {
            if sv != v {
                return false
            }
        }
    }
    return true
}