kubernetes azure_retry_test 源码
kubernetes azure_retry_test 代码
文件路径：/staging/src/k8s.io/legacy-cloud-providers/azure/retry/azure_retry_test.go
//go:build !providerless
// +build !providerless
/*
Copyright 2019 The Kubernetes 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 retry
import (
"fmt"
"math/rand"
"net/http"
"net/url"
"testing"
"time"
"github.com/Azure/go-autorest/autorest"
"github.com/Azure/go-autorest/autorest/mocks"
"github.com/stretchr/testify/assert"
)
func TestNewBackoff(t *testing.T) {
expected := &Backoff{Duration: time.Second, Factor: 2, Steps: 0, Cap: 3 * time.Second, Jitter: 0.5}
result := NewBackoff(time.Second, 2, 0.5, 0, 3*time.Second)
assert.Equal(t, expected, result)
}
func TestWithNonRetriableErrors(t *testing.T) {
bo := &Backoff{Duration: time.Second, Factor: 2, Steps: 0, Cap: 3 * time.Second, Jitter: 0.5}
errs := []string{"error1", "error2"}
expected := bo
expected.NonRetriableErrors = errs
result := bo.WithNonRetriableErrors(errs)
assert.Equal(t, expected, result)
}
func TestWithRetriableHTTPStatusCodes(t *testing.T) {
bo := &Backoff{Duration: time.Second, Factor: 2, Steps: 0, Cap: 3 * time.Second, Jitter: 0.5}
httpStatusCodes := []int{http.StatusOK, http.StatusTooManyRequests}
expected := bo
expected.RetriableHTTPStatusCodes = httpStatusCodes
result := bo.WithRetriableHTTPStatusCodes(httpStatusCodes)
assert.Equal(t, expected, result)
}
func TestIsNonRetriableError(t *testing.T) {
// false case
bo := &Backoff{Factor: 1.0, Steps: 3}
ret := bo.isNonRetriableError(nil)
assert.Equal(t, false, ret)
// true case
errs := []string{"error1", "error2"}
bo2 := bo
bo2.NonRetriableErrors = errs
rerr := &Error{
Retriable: false,
HTTPStatusCode: 429,
RawError: fmt.Errorf("error1"),
}
ret = bo2.isNonRetriableError(rerr)
assert.Equal(t, true, ret)
}
func TestJitterWithNegativeMaxFactor(t *testing.T) {
// jitter := duration + time.Duration(rand.Float64()*maxFactor*float64(duration))
// If maxFactor is 0.0 or less than 0.0, a suggested default value will be chosen.
// rand.Float64() returns, as a float64, a pseudo-random number in [0.0,1.0).
duration := time.Duration(time.Second)
maxFactor := -3.0
res := jitter(duration, maxFactor)
defaultMaxFactor := 1.0
expected := jitter(duration, defaultMaxFactor)
assert.Equal(t, expected-res >= time.Duration(0.0*float64(duration)), true)
assert.Equal(t, expected-res < time.Duration(1.0*float64(duration)), true)
}
func TestDoExponentialBackoffRetry(t *testing.T) {
client := mocks.NewSender()
bo := &Backoff{Duration: time.Second, Factor: 2, Steps: 0, Cap: 3 * time.Second, Jitter: 0.5}
sender := autorest.DecorateSender(
client,
DoExponentialBackoffRetry(bo),
)
req := &http.Request{
Method: "GET",
}
result, err := sender.Do(req)
assert.Nil(t, result)
assert.NoError(t, err)
}
func TestStep(t *testing.T) {
tests := []struct {
initial *Backoff
want []time.Duration
}{
{initial: &Backoff{Duration: time.Second, Steps: 0}, want: []time.Duration{time.Second, time.Second, time.Second}},
{initial: &Backoff{Duration: time.Second, Steps: 1}, want: []time.Duration{time.Second, time.Second, time.Second}},
{initial: &Backoff{Duration: time.Second, Factor: 1.0, Steps: 1}, want: []time.Duration{time.Second, time.Second, time.Second}},
{initial: &Backoff{Duration: time.Second, Factor: 2, Steps: 3}, want: []time.Duration{1 * time.Second, 2 * time.Second, 4 * time.Second}},
{initial: &Backoff{Duration: time.Second, Factor: 2, Steps: 3, Cap: 3 * time.Second}, want: []time.Duration{1 * time.Second, 2 * time.Second, 3 * time.Second}},
{initial: &Backoff{Duration: time.Second, Factor: 2, Steps: 2, Cap: 3 * time.Second, Jitter: 0.5}, want: []time.Duration{2 * time.Second, 3 * time.Second, 3 * time.Second}},
{initial: &Backoff{Duration: time.Second, Factor: 2, Steps: 6, Jitter: 4}, want: []time.Duration{1 * time.Second, 2 * time.Second, 4 * time.Second, 8 * time.Second, 16 * time.Second, 32 * time.Second}},
}
for seed := int64(0); seed < 5; seed++ {
for _, tt := range tests {
initial := *tt.initial
t.Run(fmt.Sprintf("%#v seed=%d", initial, seed), func(t *testing.T) {
rand.Seed(seed)
for i := 0; i < len(tt.want); i++ {
got := initial.Step()
t.Logf("[%d]=%s", i, got)
if initial.Jitter > 0 {
if got == tt.want[i] {
// this is statistically unlikely to happen by chance
t.Errorf("Backoff.Step(%d) = %v, no jitter", i, got)
continue
}
diff := float64(tt.want[i]-got) / float64(tt.want[i])
if diff > initial.Jitter {
t.Errorf("Backoff.Step(%d) = %v, want %v, outside range", i, got, tt.want)
continue
}
} else {
if got != tt.want[i] {
t.Errorf("Backoff.Step(%d) = %v, want %v", i, got, tt.want)
continue
}
}
}
})
}
}
}
func TestDoBackoffRetry(t *testing.T) {
fakeRequest := &http.Request{
URL: &url.URL{
Host: "localhost",
Path: "/api",
},
}
r := mocks.NewResponseWithStatus("500 InternalServerError", http.StatusInternalServerError)
client := mocks.NewSender()
client.AppendAndRepeatResponse(r, 3)
// retries up to steps on errors
expectedErr := &Error{
Retriable: true,
HTTPStatusCode: 500,
RawError: fmt.Errorf("HTTP status code (500)"),
}
resp, err := doBackoffRetry(client, fakeRequest, &Backoff{Factor: 1.0, Steps: 3})
assert.NotNil(t, resp)
assert.Equal(t, 500, resp.StatusCode)
assert.Equal(t, expectedErr.Error(), err)
assert.Equal(t, 3, client.Attempts())
// retries with 0 steps
respSteps0, errSteps0 := doBackoffRetry(client, fakeRequest, &Backoff{Factor: 1.0, Steps: 0})
assert.Nil(t, respSteps0)
assert.Nil(t, errSteps0)
// backoff with NonRetriableErrors and RetriableHTTPStatusCodes
r = mocks.NewResponseWithStatus("404 StatusNotFound", http.StatusNotFound)
client = mocks.NewSender()
client.AppendAndRepeatResponseWithDelay(r, time.Second, 1)
client.AppendError(fmt.Errorf("HTTP status code (404)"))
bo := &Backoff{Factor: 1.0, Steps: 3}
bo.NonRetriableErrors = []string{"404 StatusNotFound"}
bo.RetriableHTTPStatusCodes = []int{http.StatusNotFound}
expectedResp := &http.Response{
Status: "200 OK",
StatusCode: 200,
Proto: "HTTP/1.0",
ProtoMajor: 1,
ProtoMinor: 0,
Body: mocks.NewBody(""),
Request: fakeRequest,
}
resp, err = doBackoffRetry(client, fakeRequest, bo)
assert.NoError(t, err)
assert.Equal(t, 3, client.Attempts())
assert.Equal(t, expectedResp, resp)
// returns immediately on succeed
r = mocks.NewResponseWithStatus("200 OK", http.StatusOK)
client = mocks.NewSender()
client.AppendAndRepeatResponse(r, 1)
resp, err = doBackoffRetry(client, fakeRequest, &Backoff{Factor: 1.0, Steps: 3})
assert.NoError(t, err)
assert.Equal(t, 1, client.Attempts())
assert.NotNil(t, resp)
assert.Equal(t, 200, resp.StatusCode)
// returns immediately on throttling
r = mocks.NewResponseWithStatus("429 TooManyRequests", http.StatusTooManyRequests)
client = mocks.NewSender()
client.AppendAndRepeatResponse(r, 1)
expectedErr = &Error{
Retriable: false,
HTTPStatusCode: 429,
RawError: fmt.Errorf("HTTP status code (429)"),
}
resp, err = doBackoffRetry(client, fakeRequest, &Backoff{Factor: 1.0, Steps: 3})
assert.Equal(t, expectedErr.Error(), err)
assert.Equal(t, 1, client.Attempts())
assert.NotNil(t, resp)
assert.Equal(t, 429, resp.StatusCode)
// don't retry on non retriable error
r = mocks.NewResponseWithStatus("404 StatusNotFound", http.StatusNotFound)
client = mocks.NewSender()
client.AppendAndRepeatResponse(r, 1)
expectedErr = &Error{
Retriable: false,
HTTPStatusCode: 404,
RawError: fmt.Errorf("HTTP status code (404)"),
}
resp, err = doBackoffRetry(client, fakeRequest, &Backoff{Factor: 1.0, Steps: 3})
assert.NotNil(t, resp)
assert.Equal(t, 404, resp.StatusCode)
assert.Equal(t, expectedErr.Error(), err)
assert.Equal(t, 1, client.Attempts())
// retry on RetriableHTTPStatusCodes
r = mocks.NewResponseWithStatus("102 StatusProcessing", http.StatusProcessing)
client = mocks.NewSender()
client.AppendAndRepeatResponse(r, 3)
expectedErr = &Error{
Retriable: true,
HTTPStatusCode: 102,
RawError: fmt.Errorf("HTTP status code (102)"),
}
resp, err = doBackoffRetry(client, fakeRequest, &Backoff{
Factor: 1.0,
Steps: 3,
RetriableHTTPStatusCodes: []int{http.StatusProcessing},
})
assert.NotNil(t, resp)
assert.Equal(t, 102, resp.StatusCode)
assert.Equal(t, expectedErr.Error(), err)
assert.Equal(t, 3, client.Attempts())
}
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