1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// 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"
"sync"
"go.etcd.io/etcd/client/v3/concurrency"
"github.com/spf13/cobra"
)
// NewLockRacerCommand returns the cobra command for "lock-racer runner".
func NewLockRacerCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "lock-racer [name of lock (defaults to 'racers')]",
Short: "Performs lock race operation",
Run: runRacerFunc,
}
cmd.Flags().IntVar(&totalClientConnections, "total-client-connections", 10, "total number of client connections")
return cmd
}
func runRacerFunc(cmd *cobra.Command, args []string) {
racers := "racers"
if len(args) == 1 {
racers = args[0]
}
if len(args) > 1 {
ExitWithError(ExitBadArgs, errors.New("lock-racer takes at most one argument"))
}
rcs := make([]roundClient, totalClientConnections)
ctx := context.Background()
// mu ensures validate and release funcs are atomic.
var mu sync.Mutex
cnt := 0
eps := endpointsFromFlag(cmd)
for i := range rcs {
var (
s *concurrency.Session
err error
)
rcs[i].c = newClient(eps, dialTimeout)
for {
s, err = concurrency.NewSession(rcs[i].c)
if err == nil {
break
}
}
m := concurrency.NewMutex(s, racers)
rcs[i].acquire = func() error { return m.Lock(ctx) }
rcs[i].validate = func() error {
mu.Lock()
defer mu.Unlock()
if cnt++; cnt != 1 {
return fmt.Errorf("bad lock; count: %d", cnt)
}
return nil
}
rcs[i].release = func() error {
mu.Lock()
defer mu.Unlock()
if err := m.Unlock(ctx); err != nil {
return err
}
cnt = 0
return nil
}
}
// each client creates 1 key from NewMutex() and delete it from Unlock()
// a round involves in 2*len(rcs) requests.
doRounds(rcs, rounds, 2*len(rcs))
}
|
