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fetcher_test.go
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/*
Copyright The containerd 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 docker
import (
"context"
"encoding/json"
"fmt"
"io"
"math/rand"
"net/http"
"net/http/httptest"
"net/url"
"testing"
"github.com/stretchr/testify/assert"
)
func TestFetcherOpen(t *testing.T) {
content := make([]byte, 128)
rand.New(rand.NewSource(1)).Read(content)
start := 0
s := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if start > 0 {
rw.Header().Set("content-range", fmt.Sprintf("bytes %d-127/128", start))
}
rw.Header().Set("content-length", fmt.Sprintf("%d", len(content[start:])))
rw.Write(content[start:])
}))
defer s.Close()
u, err := url.Parse(s.URL)
if err != nil {
t.Fatal(err)
}
f := dockerFetcher{&dockerBase{
repository: "nonempty",
}}
host := RegistryHost{
Client: s.Client(),
Host: u.Host,
Scheme: u.Scheme,
Path: u.Path,
}
ctx := context.Background()
req := f.request(host, http.MethodGet)
checkReader := func(o int64) {
t.Helper()
rc, err := f.open(ctx, req, "", o)
if err != nil {
t.Fatalf("failed to open: %+v", err)
}
b, err := io.ReadAll(rc)
if err != nil {
t.Fatal(err)
}
expected := content[o:]
if len(b) != len(expected) {
t.Errorf("unexpected length %d, expected %d", len(b), len(expected))
return
}
for i, c := range expected {
if b[i] != c {
t.Errorf("unexpected byte %x at %d, expected %x", b[i], i, c)
return
}
}
}
checkReader(0)
// Test server ignores content range
checkReader(25)
// Use content range on server
start = 20
checkReader(20)
// Check returning just last byte and no bytes
start = 127
checkReader(127)
start = 128
checkReader(128)
// Check that server returning a different content range
// then requested errors
start = 30
_, err = f.open(ctx, req, "", 20)
if err == nil {
t.Fatal("expected error opening with invalid server response")
}
}
// New set of tests to test new error cases
func TestDockerFetcherOpen(t *testing.T) {
tests := []struct {
name string
mockedStatus int
mockedErr error
want io.ReadCloser
wantErr bool
wantServerMessageError bool
wantPlainError bool
retries int
}{
{
name: "should return status and error.message if it exists if the registry request fails",
mockedStatus: 500,
mockedErr: Errors{Error{
Code: ErrorCodeUnknown,
Message: "Test Error",
}},
want: nil,
wantErr: true,
wantServerMessageError: true,
},
{
name: "should return just status if the registry request fails and does not return a docker error",
mockedStatus: 500,
mockedErr: fmt.Errorf("Non-docker error"),
want: nil,
wantErr: true,
wantPlainError: true,
}, {
name: "should return StatusRequestTimeout after 5 retries",
mockedStatus: http.StatusRequestTimeout,
mockedErr: fmt.Errorf(http.StatusText(http.StatusRequestTimeout)),
want: nil,
wantErr: true,
wantPlainError: true,
retries: 5,
}, {
name: "should return StatusTooManyRequests after 5 retries",
mockedStatus: http.StatusTooManyRequests,
mockedErr: fmt.Errorf(http.StatusText(http.StatusTooManyRequests)),
want: nil,
wantErr: true,
wantPlainError: true,
retries: 5,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if tt.retries > 0 {
tt.retries--
}
rw.WriteHeader(tt.mockedStatus)
bytes, _ := json.Marshal(tt.mockedErr)
rw.Write(bytes)
}))
defer s.Close()
u, err := url.Parse(s.URL)
if err != nil {
t.Fatal(err)
}
f := dockerFetcher{&dockerBase{
repository: "ns",
}}
host := RegistryHost{
Client: s.Client(),
Host: u.Host,
Scheme: u.Scheme,
Path: u.Path,
}
req := f.request(host, http.MethodGet)
got, err := f.open(context.TODO(), req, "", 0)
assert.Equal(t, tt.wantErr, (err != nil))
assert.Equal(t, tt.want, got)
assert.Equal(t, tt.retries, 0)
if tt.wantErr {
var expectedError error
if tt.wantServerMessageError {
expectedError = fmt.Errorf("unexpected status code %v/ns: %v %s - Server message: %s", s.URL, tt.mockedStatus, http.StatusText(tt.mockedStatus), tt.mockedErr.Error())
} else if tt.wantPlainError {
expectedError = fmt.Errorf("unexpected status code %v/ns: %v %s", s.URL, tt.mockedStatus, http.StatusText(tt.mockedStatus))
}
assert.Equal(t, expectedError.Error(), err.Error())
}
})
}
}