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// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 transport
import (
"context"
"errors"
"io"
"net/http"
"net/http/httptest"
"strings"
"testing"
"time"
"github.com/google/go-containerregistry/internal/retry"
)
type mockTransport struct {
errs []error
resps []*http.Response
count int
}
func (t *mockTransport) RoundTrip(in *http.Request) (out *http.Response, err error) {
defer func() { t.count++ }()
if t.count < len(t.resps) {
out = t.resps[t.count]
}
if t.count < len(t.errs) {
err = t.errs[t.count]
}
return
}
type perm struct{}
func (e perm) Error() string {
return "permanent error"
}
type temp struct{}
func (e temp) Error() string {
return "temporary error"
}
func (e temp) Temporary() bool {
return true
}
func resp(code int) *http.Response {
return &http.Response{
StatusCode: code,
Body: io.NopCloser(strings.NewReader("hi")),
}
}
func TestRetryTransport(t *testing.T) {
for _, test := range []struct {
errs []error
resps []*http.Response
ctx context.Context
count int
}{{
// Don't retry retry.Never.
errs: []error{temp{}},
ctx: retry.Never(context.Background()),
count: 1,
}, {
// Don't retry permanent.
errs: []error{perm{}},
count: 1,
}, {
// Do retry temp.
errs: []error{temp{}, perm{}},
count: 2,
}, {
// Stop at some max.
errs: []error{temp{}, temp{}, temp{}, temp{}, temp{}},
count: 3,
}, {
// Retry http errors.
errs: []error{nil, nil, temp{}, temp{}, temp{}},
resps: []*http.Response{
resp(http.StatusRequestTimeout),
resp(http.StatusInternalServerError),
nil,
},
count: 3,
}} {
mt := mockTransport{
errs: test.errs,
resps: test.resps,
}
tr := NewRetry(&mt,
WithRetryBackoff(retry.Backoff{Steps: 3}),
WithRetryPredicate(retry.IsTemporary),
WithRetryStatusCodes(http.StatusRequestTimeout, http.StatusInternalServerError),
)
ctx := context.Background()
if test.ctx != nil {
ctx = test.ctx
}
req, err := http.NewRequestWithContext(ctx, "GET", "example.com", nil)
if err != nil {
t.Fatal(err)
}
tr.RoundTrip(req)
if mt.count != test.count {
t.Errorf("wrong count, wanted %d, got %d", test.count, mt.count)
}
}
}
func TestRetryDefaults(t *testing.T) {
tr := NewRetry(http.DefaultTransport)
rt, ok := tr.(*retryTransport)
if !ok {
t.Fatal("could not cast to retryTransport")
}
if rt.backoff != defaultBackoff {
t.Fatalf("default backoff wrong: %v", rt.backoff)
}
if rt.predicate == nil {
t.Fatal("default predicate not set")
}
}
func TestTimeoutContext(t *testing.T) {
tr := NewRetry(http.DefaultTransport)
slowServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// hanging request
time.Sleep(time.Second * 1)
}))
defer func() { go func() { slowServer.Close() }() }()
ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Millisecond*20))
defer cancel()
req, err := http.NewRequest("GET", slowServer.URL, nil)
if err != nil {
t.Fatal(err)
}
req = req.WithContext(ctx)
result := make(chan error)
go func() {
_, err := tr.RoundTrip(req)
result <- err
}()
select {
case err := <-result:
if !errors.Is(err, context.DeadlineExceeded) {
t.Fatalf("got: %v, want: %v", err, context.DeadlineExceeded)
}
case <-time.After(time.Millisecond * 100):
t.Fatalf("deadline was not recognized by transport")
}
}
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