| // Copyright 2016 The etcd Authors |
| // |
| // 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 runner |
| |
| import ( |
| "context" |
| "errors" |
| "fmt" |
| "log" |
| "time" |
| |
| "github.com/coreos/etcd/clientv3" |
| |
| "github.com/spf13/cobra" |
| "google.golang.org/grpc/codes" |
| "google.golang.org/grpc/status" |
| ) |
| |
| var ( |
| leaseTTL int64 |
| ) |
| |
| // NewLeaseRenewerCommand returns the cobra command for "lease-renewer runner". |
| func NewLeaseRenewerCommand() *cobra.Command { |
| cmd := &cobra.Command{ |
| Use: "lease-renewer", |
| Short: "Performs lease renew operation", |
| Run: runLeaseRenewerFunc, |
| } |
| cmd.Flags().Int64Var(&leaseTTL, "ttl", 5, "lease's ttl") |
| return cmd |
| } |
| |
| func runLeaseRenewerFunc(cmd *cobra.Command, args []string) { |
| if len(args) > 0 { |
| ExitWithError(ExitBadArgs, errors.New("lease-renewer does not take any argument")) |
| } |
| |
| eps := endpointsFromFlag(cmd) |
| c := newClient(eps, dialTimeout) |
| ctx := context.Background() |
| |
| for { |
| var ( |
| l *clientv3.LeaseGrantResponse |
| lk *clientv3.LeaseKeepAliveResponse |
| err error |
| ) |
| for { |
| l, err = c.Lease.Grant(ctx, leaseTTL) |
| if err == nil { |
| break |
| } |
| } |
| expire := time.Now().Add(time.Duration(l.TTL-1) * time.Second) |
| |
| for { |
| lk, err = c.Lease.KeepAliveOnce(ctx, l.ID) |
| if ev, ok := status.FromError(err); ok && ev.Code() == codes.NotFound { |
| if time.Since(expire) < 0 { |
| log.Fatalf("bad renew! exceeded: %v", time.Since(expire)) |
| for { |
| lk, err = c.Lease.KeepAliveOnce(ctx, l.ID) |
| fmt.Println(lk, err) |
| time.Sleep(time.Second) |
| } |
| } |
| log.Fatalf("lost lease %d, expire: %v\n", l.ID, expire) |
| break |
| } |
| if err != nil { |
| continue |
| } |
| expire = time.Now().Add(time.Duration(lk.TTL-1) * time.Second) |
| log.Printf("renewed lease %d, expire: %v\n", lk.ID, expire) |
| time.Sleep(time.Duration(lk.TTL-2) * time.Second) |
| } |
| } |
| } |