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kites.go
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kites.go
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package kontrol
import (
"math/rand"
"strings"
"github.com/hashicorp/go-version"
"github.com/koding/kite/protocol"
)
// Kites is a helpe type to work with a set of kites
type Kites []*protocol.KiteWithToken
// Attach attaches the given token to each kite. It replaces any previous
// token.
func (k Kites) Attach(token string) {
for _, kite := range k {
kite.Token = token
}
}
// Shuffle shuffles the order of the kites. This is useful if you want send
// back a randomized list of kites.
func (k *Kites) Shuffle() {
shuffled := make(Kites, len(*k))
for i, v := range rand.Perm(len(*k)) {
shuffled[v] = (*k)[i]
}
*k = shuffled
}
// Filter filters out kites with the given constraints
func (k *Kites) Filter(constraint version.Constraints, keyRest string) {
filtered := make(Kites, 0)
for _, kite := range *k {
if isValid(&kite.Kite, constraint, keyRest) {
filtered = append(filtered, kite)
}
}
*k = filtered
}
func isValid(k *protocol.Kite, c version.Constraints, keyRest string) bool {
// Check the version constraint.
v, _ := version.NewVersion(k.Version)
if !c.Check(v) {
return false
}
// Check the fields after version field.
kiteKeyAfterVersion := "/" + strings.TrimRight(k.Region+"/"+k.Hostname+"/"+k.ID, "/")
if !strings.HasPrefix(kiteKeyAfterVersion, keyRest) {
return false
}
return true
}