mirror of https://github.com/pulumi/pulumi.git
145 lines
3.4 KiB
Go
145 lines
3.4 KiB
Go
// Copyright 2023-2024, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package retry
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import (
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"context"
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"errors"
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"sync"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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func TestUntil_exhaustAttempts(t *testing.T) {
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t.Parallel()
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// Make the math for the test easy.
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delay := time.Second
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backoff := 2.0
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maxDelay := 100 * time.Second
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ctx := context.Background()
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errTooManyTries := errors.New("too many tries")
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afterRec := newAfterRecorder(time.Now())
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var attempts int
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_, _, err := (&Retryer{
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After: afterRec.After,
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}).Until(ctx, Acceptor{
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Delay: &delay,
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Backoff: &backoff,
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MaxDelay: &maxDelay,
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Accept: func(try int, delay time.Duration) (bool, interface{}, error) {
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if try > 3 {
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return false, nil, errTooManyTries
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}
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attempts++
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return false, nil, nil // operation failed
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},
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})
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assert.ErrorIs(t, err, errTooManyTries)
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assert.Equal(t, []time.Duration{
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1 * time.Second,
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2 * time.Second,
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4 * time.Second,
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8 * time.Second,
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}, afterRec.Sleeps)
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assert.Equal(t, 4, attempts)
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}
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func TestUntil_contextExpired(t *testing.T) {
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t.Parallel()
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ctx, cancel := context.WithCancel(context.Background())
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ok, _, _ := (&Retryer{
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After: newAfterRecorder(time.Now()).After,
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}).Until(ctx, Acceptor{
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Accept: func(try int, delay time.Duration) (bool, interface{}, error) {
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if try > 2 {
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cancel()
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}
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return false, nil, nil
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},
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})
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assert.False(t, ok, "should not have succeeded")
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// This is surprising behavior (no error instead of ctx.Err())
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// but it's risky to change it right now.
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// Ideally, the assertion here would be:
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// assert.ErrorIs(t, err, context.Canceled)
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}
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func TestUntil_maxDelay(t *testing.T) {
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t.Parallel()
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// Make the math for the test easy.
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delay := time.Second
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backoff := 2.0
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maxDelay := 10 * time.Second
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ctx := context.Background()
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afterRec := newAfterRecorder(time.Now())
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ok, _, err := (&Retryer{
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After: afterRec.After,
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}).Until(ctx, Acceptor{
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Delay: &delay,
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Backoff: &backoff,
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MaxDelay: &maxDelay,
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Accept: func(try int, delay time.Duration) (bool, interface{}, error) {
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// 100 tries should be enough to reach maxDelay.
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if try < 100 {
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return false, nil, nil
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}
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return true, nil, nil
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},
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})
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assert.True(t, ok)
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assert.NoError(t, err)
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assert.Len(t, afterRec.Sleeps, 100)
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for _, d := range afterRec.Sleeps {
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assert.LessOrEqual(t, d, maxDelay)
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}
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}
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// afterRecorder implements a time.After variant
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// that records all requested sleeps,
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// and advances the current time instantly.
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type afterRecorder struct {
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mu sync.Mutex
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now time.Time
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// Sleeps is the list of all sleeps requested.
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Sleeps []time.Duration
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}
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func newAfterRecorder(now time.Time) *afterRecorder {
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return &afterRecorder{
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now: now,
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}
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}
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func (r *afterRecorder) After(d time.Duration) <-chan time.Time {
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r.mu.Lock()
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r.Sleeps = append(r.Sleeps, d)
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r.now = r.now.Add(d)
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r.mu.Unlock()
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afterc := make(chan time.Time, 1)
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afterc <- r.now
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return afterc
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}
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