mirror of
https://github.com/crazybber/go-pattern-examples.git
synced 2024-11-23 04:16:02 +03:00
180 lines
3.0 KiB
Go
180 lines
3.0 KiB
Go
package retrier
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import (
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"context"
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"errors"
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"testing"
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"time"
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)
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var i int
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func genWork(returns []error) func() error {
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i = 0
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return func() error {
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i++
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if i > len(returns) {
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return nil
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}
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return returns[i-1]
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}
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}
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func genWorkWithCtx() func(ctx context.Context) error {
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i = 0
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return func(ctx context.Context) error {
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select {
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case <-ctx.Done():
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return errFoo
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default:
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i++
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}
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return nil
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}
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}
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func TestRetrier(t *testing.T) {
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r := New([]time.Duration{0, 10 * time.Millisecond}, WhitelistClassifier{errFoo})
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err := r.Run(genWork([]error{errFoo, errFoo}))
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if err != nil {
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t.Error(err)
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}
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if i != 3 {
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t.Error("run wrong number of times")
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}
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err = r.Run(genWork([]error{errFoo, errBar}))
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if err != errBar {
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t.Error(err)
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}
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if i != 2 {
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t.Error("run wrong number of times")
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}
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err = r.Run(genWork([]error{errBar, errBaz}))
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if err != errBar {
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t.Error(err)
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}
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if i != 1 {
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t.Error("run wrong number of times")
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}
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}
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func TestRetrierCtx(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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r := New([]time.Duration{0, 10 * time.Millisecond}, WhitelistClassifier{})
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err := r.RunCtx(ctx, genWorkWithCtx())
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if err != nil {
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t.Error(err)
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}
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if i != 1 {
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t.Error("run wrong number of times")
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}
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cancel()
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err = r.RunCtx(ctx, genWorkWithCtx())
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if err != errFoo {
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t.Error("context must be cancelled")
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}
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if i != 0 {
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t.Error("run wrong number of times")
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}
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}
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func TestRetrierNone(t *testing.T) {
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r := New(nil, nil)
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i = 0
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err := r.Run(func() error {
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i++
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return errFoo
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})
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if err != errFoo {
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t.Error(err)
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}
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if i != 1 {
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t.Error("run wrong number of times")
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}
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i = 0
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err = r.Run(func() error {
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i++
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return nil
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})
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if err != nil {
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t.Error(err)
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}
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if i != 1 {
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t.Error("run wrong number of times")
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}
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}
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func TestRetrierJitter(t *testing.T) {
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r := New([]time.Duration{0, 10 * time.Millisecond, 4 * time.Hour}, nil)
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if r.calcSleep(0) != 0 {
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t.Error("Incorrect sleep calculated")
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}
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if r.calcSleep(1) != 10*time.Millisecond {
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t.Error("Incorrect sleep calculated")
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}
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if r.calcSleep(2) != 4*time.Hour {
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t.Error("Incorrect sleep calculated")
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}
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r.SetJitter(0.25)
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for i := 0; i < 20; i++ {
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if r.calcSleep(0) != 0 {
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t.Error("Incorrect sleep calculated")
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}
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slp := r.calcSleep(1)
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if slp < 7500*time.Microsecond || slp > 12500*time.Microsecond {
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t.Error("Incorrect sleep calculated")
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}
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slp = r.calcSleep(2)
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if slp < 3*time.Hour || slp > 5*time.Hour {
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t.Error("Incorrect sleep calculated")
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}
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}
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r.SetJitter(-1)
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if r.jitter != 0.25 {
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t.Error("Invalid jitter value accepted")
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}
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r.SetJitter(2)
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if r.jitter != 0.25 {
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t.Error("Invalid jitter value accepted")
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}
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}
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func TestRetrierThreadSafety(t *testing.T) {
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r := New([]time.Duration{0}, nil)
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for i := 0; i < 2; i++ {
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go func() {
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r.Run(func() error {
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return errors.New("error")
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})
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}()
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}
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}
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func ExampleRetrier() {
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r := New(ConstantBackoff(3, 100*time.Millisecond), nil)
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err := r.Run(func() error {
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// do some work
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return nil
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})
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if err != nil {
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// handle the case where the work failed three times
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}
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}
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