mirror of
https://github.com/restic/restic.git
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282 lines
6.9 KiB
Go
282 lines
6.9 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gensupport
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import (
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"reflect"
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"strings"
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"testing"
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"golang.org/x/net/context"
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)
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type unexpectedReader struct{}
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func (unexpectedReader) Read([]byte) (int, error) {
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return 0, fmt.Errorf("unexpected read in test")
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}
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// event is an expected request/response pair
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type event struct {
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// the byte range header that should be present in a request.
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byteRange string
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// the http status code to send in response.
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responseStatus int
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}
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// interruptibleTransport is configured with a canned set of requests/responses.
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// It records the incoming data, unless the corresponding event is configured to return
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// http.StatusServiceUnavailable.
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type interruptibleTransport struct {
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events []event
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buf []byte
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bodies bodyTracker
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}
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// bodyTracker keeps track of response bodies that have not been closed.
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type bodyTracker map[io.ReadCloser]struct{}
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func (bt bodyTracker) Add(body io.ReadCloser) {
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bt[body] = struct{}{}
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}
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func (bt bodyTracker) Close(body io.ReadCloser) {
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delete(bt, body)
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}
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type trackingCloser struct {
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io.Reader
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tracker bodyTracker
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}
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func (tc *trackingCloser) Close() error {
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tc.tracker.Close(tc)
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return nil
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}
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func (tc *trackingCloser) Open() {
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tc.tracker.Add(tc)
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}
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func (t *interruptibleTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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ev := t.events[0]
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t.events = t.events[1:]
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if got, want := req.Header.Get("Content-Range"), ev.byteRange; got != want {
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return nil, fmt.Errorf("byte range: got %s; want %s", got, want)
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}
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if ev.responseStatus != http.StatusServiceUnavailable {
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buf, err := ioutil.ReadAll(req.Body)
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if err != nil {
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return nil, fmt.Errorf("error reading from request data: %v", err)
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}
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t.buf = append(t.buf, buf...)
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}
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tc := &trackingCloser{unexpectedReader{}, t.bodies}
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tc.Open()
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h := http.Header{}
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status := ev.responseStatus
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// Support "X-GUploader-No-308" like Google:
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if status == 308 && req.Header.Get("X-GUploader-No-308") == "yes" {
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status = 200
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h.Set("X-Http-Status-Code-Override", "308")
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}
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res := &http.Response{
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StatusCode: status,
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Header: h,
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Body: tc,
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}
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return res, nil
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}
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// progressRecorder records updates, and calls f for every invocation of ProgressUpdate.
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type progressRecorder struct {
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updates []int64
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f func()
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}
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func (pr *progressRecorder) ProgressUpdate(current int64) {
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pr.updates = append(pr.updates, current)
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if pr.f != nil {
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pr.f()
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}
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}
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func TestInterruptedTransferChunks(t *testing.T) {
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type testCase struct {
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data string
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chunkSize int
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events []event
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wantProgress []int64
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}
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for _, tc := range []testCase{
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{
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data: strings.Repeat("a", 300),
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chunkSize: 90,
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events: []event{
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{"bytes 0-89/*", http.StatusServiceUnavailable},
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{"bytes 0-89/*", 308},
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{"bytes 90-179/*", 308},
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{"bytes 180-269/*", http.StatusServiceUnavailable},
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{"bytes 180-269/*", 308},
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{"bytes 270-299/300", 200},
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},
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wantProgress: []int64{90, 180, 270, 300},
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},
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{
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data: strings.Repeat("a", 20),
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chunkSize: 10,
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events: []event{
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{"bytes 0-9/*", http.StatusServiceUnavailable},
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{"bytes 0-9/*", 308},
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{"bytes 10-19/*", http.StatusServiceUnavailable},
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{"bytes 10-19/*", 308},
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// 0 byte final request demands a byte range with leading asterix.
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{"bytes */20", http.StatusServiceUnavailable},
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{"bytes */20", 200},
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},
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wantProgress: []int64{10, 20},
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},
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} {
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media := strings.NewReader(tc.data)
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tr := &interruptibleTransport{
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buf: make([]byte, 0, len(tc.data)),
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events: tc.events,
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bodies: bodyTracker{},
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}
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pr := progressRecorder{}
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rx := &ResumableUpload{
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Client: &http.Client{Transport: tr},
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Media: NewMediaBuffer(media, tc.chunkSize),
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MediaType: "text/plain",
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Callback: pr.ProgressUpdate,
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Backoff: NoPauseStrategy,
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}
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res, err := rx.Upload(context.Background())
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if err == nil {
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res.Body.Close()
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}
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if err != nil || res == nil || res.StatusCode != http.StatusOK {
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if res == nil {
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t.Errorf("Upload not successful, res=nil: %v", err)
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} else {
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t.Errorf("Upload not successful, statusCode=%v: %v", res.StatusCode, err)
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}
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}
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if !reflect.DeepEqual(tr.buf, []byte(tc.data)) {
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t.Errorf("transferred contents:\ngot %s\nwant %s", tr.buf, tc.data)
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}
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if !reflect.DeepEqual(pr.updates, tc.wantProgress) {
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t.Errorf("progress updates: got %v, want %v", pr.updates, tc.wantProgress)
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}
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if len(tr.events) > 0 {
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t.Errorf("did not observe all expected events. leftover events: %v", tr.events)
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}
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if len(tr.bodies) > 0 {
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t.Errorf("unclosed request bodies: %v", tr.bodies)
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}
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}
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}
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func TestCancelUploadFast(t *testing.T) {
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const (
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chunkSize = 90
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mediaSize = 300
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)
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media := strings.NewReader(strings.Repeat("a", mediaSize))
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tr := &interruptibleTransport{
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buf: make([]byte, 0, mediaSize),
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}
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pr := progressRecorder{}
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rx := &ResumableUpload{
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Client: &http.Client{Transport: tr},
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Media: NewMediaBuffer(media, chunkSize),
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MediaType: "text/plain",
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Callback: pr.ProgressUpdate,
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Backoff: NoPauseStrategy,
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}
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ctx, cancelFunc := context.WithCancel(context.Background())
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cancelFunc() // stop the upload that hasn't started yet
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res, err := rx.Upload(ctx)
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if err != context.Canceled {
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t.Errorf("Upload err: got: %v; want: context cancelled", err)
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}
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if res != nil {
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t.Errorf("Upload result: got: %v; want: nil", res)
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}
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if pr.updates != nil {
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t.Errorf("progress updates: got %v; want: nil", pr.updates)
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}
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}
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func TestCancelUpload(t *testing.T) {
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const (
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chunkSize = 90
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mediaSize = 300
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)
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media := strings.NewReader(strings.Repeat("a", mediaSize))
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tr := &interruptibleTransport{
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buf: make([]byte, 0, mediaSize),
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events: []event{
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{"bytes 0-89/*", http.StatusServiceUnavailable},
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{"bytes 0-89/*", 308},
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{"bytes 90-179/*", 308},
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{"bytes 180-269/*", 308}, // Upload should be cancelled before this event.
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},
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bodies: bodyTracker{},
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}
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ctx, cancelFunc := context.WithCancel(context.Background())
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numUpdates := 0
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pr := progressRecorder{f: func() {
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numUpdates++
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if numUpdates >= 2 {
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cancelFunc()
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}
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}}
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rx := &ResumableUpload{
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Client: &http.Client{Transport: tr},
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Media: NewMediaBuffer(media, chunkSize),
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MediaType: "text/plain",
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Callback: pr.ProgressUpdate,
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Backoff: NoPauseStrategy,
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}
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res, err := rx.Upload(ctx)
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if err != context.Canceled {
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t.Errorf("Upload err: got: %v; want: context cancelled", err)
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}
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if res != nil {
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t.Errorf("Upload result: got: %v; want: nil", res)
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}
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if got, want := tr.buf, []byte(strings.Repeat("a", chunkSize*2)); !reflect.DeepEqual(got, want) {
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t.Errorf("transferred contents:\ngot %s\nwant %s", got, want)
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}
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if got, want := pr.updates, []int64{chunkSize, chunkSize * 2}; !reflect.DeepEqual(got, want) {
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t.Errorf("progress updates: got %v; want: %v", got, want)
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}
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if len(tr.bodies) > 0 {
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t.Errorf("unclosed request bodies: %v", tr.bodies)
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}
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}
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