forked from TrueCloudLab/restic
112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
// Copyright 2018 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"strconv"
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"strings"
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"testing"
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"golang.org/x/net/context"
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"google.golang.org/api/option"
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)
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const readData = "0123456789"
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func TestRangeReader(t *testing.T) {
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hc, close := newTestServer(handleRangeRead)
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defer close()
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ctx := context.Background()
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c, err := NewClient(ctx, option.WithHTTPClient(hc))
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if err != nil {
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t.Fatal(err)
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}
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obj := c.Bucket("b").Object("o")
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for _, test := range []struct {
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offset, length int64
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want string
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}{
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{0, -1, readData},
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{0, 10, readData},
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{0, 5, readData[:5]},
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{1, 3, readData[1:4]},
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{6, -1, readData[6:]},
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{4, 20, readData[4:]},
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} {
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r, err := obj.NewRangeReader(ctx, test.offset, test.length)
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if err != nil {
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t.Errorf("%d/%d: %v", test.offset, test.length, err)
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continue
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}
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gotb, err := ioutil.ReadAll(r)
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if err != nil {
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t.Errorf("%d/%d: %v", test.offset, test.length, err)
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continue
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}
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if got := string(gotb); got != test.want {
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t.Errorf("%d/%d: got %q, want %q", test.offset, test.length, got, test.want)
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}
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}
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}
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func handleRangeRead(w http.ResponseWriter, r *http.Request) {
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rh := strings.TrimSpace(r.Header.Get("Range"))
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data := readData
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var from, to int
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if rh == "" {
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from = 0
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to = len(data)
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} else {
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// assume "bytes=N-" or "bytes=N-M"
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var err error
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i := strings.IndexRune(rh, '=')
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j := strings.IndexRune(rh, '-')
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from, err = strconv.Atoi(rh[i+1 : j])
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if err != nil {
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w.WriteHeader(500)
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return
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}
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to = len(data)
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if j+1 < len(rh) {
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to, err = strconv.Atoi(rh[j+1:])
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if err != nil {
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w.WriteHeader(500)
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return
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}
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to++ // Range header is inclusive, Go slice is exclusive
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}
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if from >= len(data) && to != from {
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w.WriteHeader(416)
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return
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}
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if from > len(data) {
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from = len(data)
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}
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if to > len(data) {
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to = len(data)
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}
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}
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data = data[from:to]
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if data != readData {
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w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", from, to-1, len(readData)))
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w.WriteHeader(http.StatusPartialContent)
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}
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if _, err := w.Write([]byte(data)); err != nil {
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panic(err)
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}
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}
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