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
|
package lmdbsync
import (
"fmt"
"testing"
"time"
"golang.org/x/net/context"
"github.com/bmatsuo/lmdb-go/internal/lmdbtest"
"github.com/bmatsuo/lmdb-go/lmdb"
)
type testHandler struct {
called bool
ctx context.Context
env *Env
err error
}
func (h *testHandler) HandleTxnErr(ctx context.Context, env *Env, err error) (context.Context, error) {
h.called = true
h.ctx = ctx
h.env = env
h.err = err
return ctx, err
}
func TestHandlerChain(t *testing.T) {
ctx := context.Background()
env, err := newEnv(nil)
if err != nil {
t.Fatal(err)
}
defer lmdbtest.Destroy(env.Env)
var chain1 HandlerChain
errother := fmt.Errorf("testerr")
ctx1, err := chain1.HandleTxnErr(ctx, env, errother)
if err != errother {
t.Error(err)
}
if ctx1 != ctx {
t.Errorf("unexpected ctx: %#v (!= %#v)", ctx1, ctx)
}
chain2 := chain1.Append(&passthroughHandler{})
ctx2, err := chain2.HandleTxnErr(ctx, env, errother)
if err != errother {
t.Error(err)
}
if ctx2 != ctx {
t.Errorf("unexpected ctx: %#v (!= %#v)", ctx2, ctx)
}
}
type retryHandler struct{}
func (*retryHandler) HandleTxnErr(ctx context.Context, env *Env, err error) (context.Context, error) {
return ctx, ErrTxnRetry
}
type passthroughHandler struct{}
func (*passthroughHandler) HandleTxnErr(ctx context.Context, env *Env, err error) (context.Context, error) {
return ctx, err
}
func TestMapFullHandler(t *testing.T) {
ctx := context.Background()
env, err := newEnv(nil)
if err != nil {
t.Fatal(err)
}
defer lmdbtest.Destroy(env.Env)
info, err := env.Info()
if err != nil {
t.Error(err)
return
}
orig := info.MapSize
doubleSize := func(size int64) (int64, bool) { return size * 2, true }
handler := MapFullHandler(doubleSize)
errother := fmt.Errorf("testerr")
ctx1, err := handler.HandleTxnErr(ctx, env, errother)
if ctx1 != ctx {
t.Errorf("ctx changed: %q (!= %q)", ctx1, ctx)
}
errmapfull := &lmdb.OpError{
Op: "lmdbsync_test_op",
Errno: lmdb.MapFull,
}
ctx1, err = handler.HandleTxnErr(ctx, env, errmapfull)
if err != ErrTxnRetry {
t.Errorf("unexpected error: %v", err)
}
if ctx1 != ctx {
t.Errorf("ctx changed: %q (!= %q)", ctx1, ctx)
}
info, err = env.Info()
if err != nil {
t.Error(err)
return
}
if info.MapSize <= orig {
t.Errorf("unexpected map size: %d (<= %d)", info.MapSize, orig)
}
}
func TestMapResizedHandler(t *testing.T) {
ctx := context.Background()
env, err := newEnv(nil)
if err != nil {
t.Fatal(err)
}
defer lmdbtest.Destroy(env.Env)
handler := MapResizedHandler(2, func(int) time.Duration { return 100 * time.Microsecond })
errother := fmt.Errorf("testerr")
_, err = handler.HandleTxnErr(ctx, env, errother)
errmapresized := &lmdb.OpError{
Op: "lmdbsync_test_op",
Errno: lmdb.MapResized,
}
ctx1, err := handler.HandleTxnErr(ctx, env, errmapresized)
if err != ErrTxnRetry {
t.Errorf("unexpected error: %v", err)
}
ctx2, err := handler.HandleTxnErr(ctx1, env, errmapresized)
if err != ErrTxnRetry {
t.Errorf("unexpected error: %v", err)
}
// after MapResized has been encountered enough times consecutively the
// handler starts passing MapResized through to the caller.
_, err = handler.HandleTxnErr(ctx2, env, errmapresized)
if !lmdb.IsMapResized(err) {
t.Errorf("unexpected error: %v", err)
}
ctx3, err := handler.HandleTxnErr(ctx2, env, errmapresized)
if !lmdb.IsMapResized(err) {
t.Errorf("unexpected error: %v", err)
}
ctx4, err := handler.HandleTxnErr(ctx3, env, errother)
if err != errother {
t.Errorf("unexpected error: %v", err)
}
// after encountering an error other than MapResized the handler resets its
// failure count and will continue attempting to adopt the new map size
// when MapResized is encountered.
ctx5, err := handler.HandleTxnErr(ctx4, env, errmapresized)
if err != ErrTxnRetry {
t.Errorf("unexpected error: %v", err)
}
_, err = handler.HandleTxnErr(ctx5, env, errmapresized)
if err != ErrTxnRetry {
t.Errorf("unexpected error: %v", err)
}
}
func TestExponentialBackoff(t *testing.T) {
base := time.Millisecond
max := 3 * time.Millisecond
factor := 2.0
backoff := ExponentialBackoff(base, max, factor)
const numtest = 100
for i := 0; i < numtest; i++ {
n := backoff(0)
if n < 0 || n > base {
t.Errorf("unexpected backoff: %v", n)
}
}
for i := 0; i < numtest; i++ {
n := backoff(1)
if n < 0 || n > 2*base {
t.Errorf("unexpected backoff: %v", n)
}
}
for i := 0; i < numtest; i++ {
n := backoff(2)
if n < 0 || n > max {
t.Errorf("unexpected backoff: %v", n)
}
}
}
|
