1 files changed, 177 insertions, 0 deletions
diff --git a/pkg/v1/remote/transport/retry_test.go b/pkg/v1/remote/transport/retry_test.go
new file mode 100644
index 0000000..ded0ce0
--- /dev/null
+++ b/pkg/v1/remote/transport/retry_test.go
@@ -0,0 +1,177 @@
+// 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")
+	}
+}