forked from etcd-io/etcd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
checks.go
198 lines (171 loc) · 5.64 KB
/
checks.go
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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
// 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 main
import (
"fmt"
"time"
"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"golang.org/x/net/context"
)
const (
retries = 7
)
type Checker interface {
// Check returns an error if the system fails a consistency check.
Check() error
}
type hashAndRevGetter interface {
getRevisionHash() (revs map[string]int64, hashes map[string]int64, err error)
}
type hashChecker struct {
hrg hashAndRevGetter
}
func newHashChecker(hrg hashAndRevGetter) Checker { return &hashChecker{hrg} }
const leaseCheckerTimeout = 10 * time.Second
func (hc *hashChecker) checkRevAndHashes() (err error) {
var (
revs map[string]int64
hashes map[string]int64
)
// retries in case of transient failure or etcd cluster has not stablized yet.
for i := 0; i < retries; i++ {
revs, hashes, err = hc.hrg.getRevisionHash()
if err != nil {
plog.Warningf("retry %d. failed to retrieve revison and hash (%v)", i, err)
} else {
sameRev := getSameValue(revs)
sameHashes := getSameValue(hashes)
if sameRev && sameHashes {
return nil
}
plog.Warningf("retry %d. etcd cluster is not stable: [revisions: %v] and [hashes: %v]", i, revs, hashes)
}
time.Sleep(time.Second)
}
if err != nil {
return fmt.Errorf("failed revision and hash check (%v)", err)
}
return fmt.Errorf("etcd cluster is not stable: [revisions: %v] and [hashes: %v]", revs, hashes)
}
func (hc *hashChecker) Check() error {
return hc.checkRevAndHashes()
}
type leaseChecker struct{ ls *leaseStresser }
func (lc *leaseChecker) Check() error {
plog.Infof("checking revoked leases %v", lc.ls.revokedLeases.leases)
if err := lc.check(true, lc.ls.revokedLeases.leases); err != nil {
return err
}
plog.Infof("checking alive leases %v", lc.ls.aliveLeases.leases)
if err := lc.check(false, lc.ls.aliveLeases.leases); err != nil {
return err
}
plog.Infof("checking short lived leases %v", lc.ls.shortLivedLeases.leases)
return lc.checkShortLivedLeases()
}
// checkShortLivedLeases ensures leases expire.
func (lc *leaseChecker) checkShortLivedLeases() error {
ctx, cancel := context.WithTimeout(context.Background(), leaseCheckerTimeout)
errc := make(chan error)
defer cancel()
for leaseID := range lc.ls.shortLivedLeases.leases {
go func(id int64) {
errc <- lc.checkShortLivedLease(ctx, id)
}(leaseID)
}
var errs []error
for range lc.ls.shortLivedLeases.leases {
if err := <-errc; err != nil {
errs = append(errs, err)
}
}
return errsToError(errs)
}
func (lc *leaseChecker) checkShortLivedLease(ctx context.Context, leaseID int64) (err error) {
// retry in case of transient failure or lease is expired but not yet revoked due to the fact that etcd cluster didn't have enought time to delete it.
var resp *pb.LeaseTimeToLiveResponse
for i := 0; i < retries; i++ {
resp, err = lc.ls.getLeaseByID(ctx, leaseID)
if rpctypes.Error(err) == rpctypes.ErrLeaseNotFound {
return nil
}
if err != nil {
plog.Warningf("retry %d. failed to retrieve lease %v error (%v)", i, leaseID, err)
continue
}
if resp.TTL > 0 {
plog.Warningf("lease %v is not expired. sleep for %d until it expires.", leaseID, resp.TTL)
time.Sleep(time.Duration(resp.TTL) * time.Second)
} else {
plog.Warningf("retry %d. lease %v is expired but not yet revoked", i, leaseID)
time.Sleep(time.Second)
}
if err = lc.checkLease(ctx, false, leaseID); err != nil {
continue
}
return nil
}
return err
}
func (lc *leaseChecker) checkLease(ctx context.Context, expired bool, leaseID int64) error {
keysExpired, err := lc.ls.hasKeysAttachedToLeaseExpired(ctx, leaseID)
if err != nil {
plog.Errorf("hasKeysAttachedToLeaseExpired error: (%v)", err)
return err
}
leaseExpired, err := lc.ls.hasLeaseExpired(ctx, leaseID)
if err != nil {
plog.Errorf("hasLeaseExpired error: (%v)", err)
return err
}
if leaseExpired != keysExpired {
return fmt.Errorf("lease %v expiration mismatch (lease expired=%v, keys expired=%v)", leaseID, leaseExpired, keysExpired)
}
if leaseExpired != expired {
return fmt.Errorf("lease %v expected expired=%v, got %v", leaseID, expired, leaseExpired)
}
return nil
}
func (lc *leaseChecker) check(expired bool, leases map[int64]time.Time) error {
ctx, cancel := context.WithTimeout(context.Background(), leaseCheckerTimeout)
defer cancel()
for leaseID := range leases {
if err := lc.checkLease(ctx, expired, leaseID); err != nil {
return err
}
}
return nil
}
// compositeChecker implements a checker that runs a slice of Checkers concurrently.
type compositeChecker struct{ checkers []Checker }
func newCompositeChecker(checkers []Checker) Checker {
return &compositeChecker{checkers}
}
func (cchecker *compositeChecker) Check() error {
errc := make(chan error)
for _, c := range cchecker.checkers {
go func(chk Checker) { errc <- chk.Check() }(c)
}
var errs []error
for range cchecker.checkers {
if err := <-errc; err != nil {
errs = append(errs, err)
}
}
return errsToError(errs)
}
type noChecker struct{}
func newNoChecker() Checker { return &noChecker{} }
func (nc *noChecker) Check() error { return nil }