// Copyright 2015 CoreOS, Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package subnet import ( "time" log "github.com/coreos/flannel/Godeps/_workspace/src/github.com/golang/glog" "github.com/coreos/flannel/Godeps/_workspace/src/golang.org/x/net/context" ) const ( renewMargin = time.Hour ) func LeaseRenewer(ctx context.Context, m Manager, network string, lease *Lease) { dur := lease.Expiration.Sub(time.Now()) - renewMargin for { select { case <-time.After(dur): err := m.RenewLease(ctx, network, lease) if err != nil { log.Error("Error renewing lease (trying again in 1 min): ", err) dur = time.Minute continue } log.Info("Lease renewed, new expiration: ", lease.Expiration) dur = lease.Expiration.Sub(time.Now()) - renewMargin case <-ctx.Done(): return } } }