/usr/share/gocode/src/gopkg.in/eapache/go-resiliency.v1/breaker/breaker_test.go is in golang-gopkg-eapache-go-resiliency.v1-dev 0.0~git20150213.0.6800482-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | package breaker
import (
"errors"
"testing"
"time"
)
var errSomeError = errors.New("errSomeError")
func alwaysPanics() error {
panic("foo")
}
func returnsError() error {
return errSomeError
}
func returnsSuccess() error {
return nil
}
func TestBreakerErrorExpiry(t *testing.T) {
breaker := New(2, 1, 1*time.Second)
for i := 0; i < 3; i++ {
if err := breaker.Run(returnsError); err != errSomeError {
t.Error(err)
}
time.Sleep(1 * time.Second)
}
for i := 0; i < 3; i++ {
if err := breaker.Go(returnsError); err != nil {
t.Error(err)
}
time.Sleep(1 * time.Second)
}
}
func TestBreakerPanicsCountAsErrors(t *testing.T) {
breaker := New(3, 2, 1*time.Second)
// three errors opens the breaker
for i := 0; i < 3; i++ {
func() {
defer func() {
val := recover()
if val.(string) != "foo" {
t.Error("incorrect panic")
}
}()
if err := breaker.Run(alwaysPanics); err != nil {
t.Error(err)
}
t.Error("shouldn't get here")
}()
}
// breaker is open
for i := 0; i < 5; i++ {
if err := breaker.Run(returnsError); err != ErrBreakerOpen {
t.Error(err)
}
}
}
func TestBreakerStateTransitions(t *testing.T) {
breaker := New(3, 2, 1*time.Second)
// three errors opens the breaker
for i := 0; i < 3; i++ {
if err := breaker.Run(returnsError); err != errSomeError {
t.Error(err)
}
}
// breaker is open
for i := 0; i < 5; i++ {
if err := breaker.Run(returnsError); err != ErrBreakerOpen {
t.Error(err)
}
}
// wait for it to half-close
time.Sleep(2 * time.Second)
// one success works, but is not enough to fully close
if err := breaker.Run(returnsSuccess); err != nil {
t.Error(err)
}
// error works, but re-opens immediately
if err := breaker.Run(returnsError); err != errSomeError {
t.Error(err)
}
// breaker is open
if err := breaker.Run(returnsError); err != ErrBreakerOpen {
t.Error(err)
}
// wait for it to half-close
time.Sleep(2 * time.Second)
// two successes is enough to close it for good
for i := 0; i < 2; i++ {
if err := breaker.Run(returnsSuccess); err != nil {
t.Error(err)
}
}
// error works
if err := breaker.Run(returnsError); err != errSomeError {
t.Error(err)
}
// breaker is still closed
if err := breaker.Run(returnsSuccess); err != nil {
t.Error(err)
}
}
func TestBreakerAsyncStateTransitions(t *testing.T) {
breaker := New(3, 2, 1*time.Second)
// three errors opens the breaker
for i := 0; i < 3; i++ {
if err := breaker.Go(returnsError); err != nil {
t.Error(err)
}
}
// just enough to yield the scheduler and let the goroutines work off
time.Sleep(1 * time.Millisecond)
// breaker is open
for i := 0; i < 5; i++ {
if err := breaker.Go(returnsError); err != ErrBreakerOpen {
t.Error(err)
}
}
// wait for it to half-close
time.Sleep(2 * time.Second)
// one success works, but is not enough to fully close
if err := breaker.Go(returnsSuccess); err != nil {
t.Error(err)
}
// error works, but re-opens immediately
if err := breaker.Go(returnsError); err != nil {
t.Error(err)
}
// just enough to yield the scheduler and let the goroutines work off
time.Sleep(1 * time.Millisecond)
// breaker is open
if err := breaker.Go(returnsError); err != ErrBreakerOpen {
t.Error(err)
}
// wait for it to half-close
time.Sleep(2 * time.Second)
// two successes is enough to close it for good
for i := 0; i < 2; i++ {
if err := breaker.Go(returnsSuccess); err != nil {
t.Error(err)
}
}
// just enough to yield the scheduler and let the goroutines work off
time.Sleep(1 * time.Millisecond)
// error works
if err := breaker.Go(returnsError); err != nil {
t.Error(err)
}
// just enough to yield the scheduler and let the goroutines work off
time.Sleep(1 * time.Millisecond)
// breaker is still closed
if err := breaker.Go(returnsSuccess); err != nil {
t.Error(err)
}
}
func ExampleBreaker() {
breaker := New(3, 1, 5*time.Second)
for {
result := breaker.Run(func() error {
// communicate with some external service and
// return an error if the communication failed
return nil
})
switch result {
case nil:
// success!
case ErrBreakerOpen:
// our function wasn't run because the breaker was open
default:
// some other error
}
}
}
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