mirror of
https://github.com/restic/restic.git
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184 lines
5.1 KiB
Go
184 lines
5.1 KiB
Go
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// Copyright 2011 Google Inc. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package blobstore
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import (
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"io"
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"os"
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"strconv"
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"strings"
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"testing"
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"google.golang.org/appengine"
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"google.golang.org/appengine/internal/aetesting"
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pb "google.golang.org/appengine/internal/blobstore"
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)
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const rbs = readBufferSize
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func min(x, y int) int {
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if x < y {
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return x
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}
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return y
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}
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func fakeFetchData(req *pb.FetchDataRequest, res *pb.FetchDataResponse) error {
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i0 := int(*req.StartIndex)
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i1 := int(*req.EndIndex + 1) // Blobstore's end-indices are inclusive; Go's are exclusive.
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bk := *req.BlobKey
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if i := strings.Index(bk, "."); i != -1 {
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// Strip everything past the ".".
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bk = bk[:i]
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}
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switch bk {
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case "a14p":
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const s = "abcdefghijklmnop"
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i0 := min(len(s), i0)
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i1 := min(len(s), i1)
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res.Data = []byte(s[i0:i1])
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case "longBlob":
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res.Data = make([]byte, i1-i0)
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for i := range res.Data {
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res.Data[i] = 'A' + uint8(i0/rbs)
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i0++
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}
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}
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return nil
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}
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// step is one step of a readerTest.
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// It consists of a Reader method to call, the method arguments
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// (lenp, offset, whence) and the expected results.
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type step struct {
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method string
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lenp int
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offset int64
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whence int
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want string
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wantErr error
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}
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var readerTest = []struct {
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blobKey string
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step []step
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}{
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{"noSuchBlobKey", []step{
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{"Read", 8, 0, 0, "", io.EOF},
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}},
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{"a14p.0", []step{
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// Test basic reads.
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{"Read", 1, 0, 0, "a", nil},
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{"Read", 3, 0, 0, "bcd", nil},
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{"Read", 1, 0, 0, "e", nil},
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{"Read", 2, 0, 0, "fg", nil},
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// Test Seek.
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{"Seek", 0, 2, os.SEEK_SET, "2", nil},
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{"Read", 5, 0, 0, "cdefg", nil},
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{"Seek", 0, 2, os.SEEK_CUR, "9", nil},
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{"Read", 1, 0, 0, "j", nil},
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// Test reads up to and past EOF.
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{"Read", 5, 0, 0, "klmno", nil},
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{"Read", 5, 0, 0, "p", nil},
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{"Read", 5, 0, 0, "", io.EOF},
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// Test ReadAt.
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{"ReadAt", 4, 0, 0, "abcd", nil},
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{"ReadAt", 4, 3, 0, "defg", nil},
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{"ReadAt", 4, 12, 0, "mnop", nil},
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{"ReadAt", 4, 13, 0, "nop", io.EOF},
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{"ReadAt", 4, 99, 0, "", io.EOF},
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}},
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{"a14p.1", []step{
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// Test Seek before any reads.
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{"Seek", 0, 2, os.SEEK_SET, "2", nil},
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{"Read", 1, 0, 0, "c", nil},
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// Test that ReadAt doesn't affect the Read offset.
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{"ReadAt", 3, 9, 0, "jkl", nil},
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{"Read", 3, 0, 0, "def", nil},
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}},
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{"a14p.2", []step{
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// Test ReadAt before any reads or seeks.
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{"ReadAt", 2, 14, 0, "op", nil},
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}},
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{"longBlob.0", []step{
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// Test basic read.
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{"Read", 1, 0, 0, "A", nil},
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// Test that Read returns early when the buffer is exhausted.
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{"Seek", 0, rbs - 2, os.SEEK_SET, strconv.Itoa(rbs - 2), nil},
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{"Read", 5, 0, 0, "AA", nil},
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{"Read", 3, 0, 0, "BBB", nil},
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// Test that what we just read is still in the buffer.
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{"Seek", 0, rbs - 2, os.SEEK_SET, strconv.Itoa(rbs - 2), nil},
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{"Read", 5, 0, 0, "AABBB", nil},
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// Test ReadAt.
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{"ReadAt", 3, rbs - 4, 0, "AAA", nil},
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{"ReadAt", 6, rbs - 4, 0, "AAAABB", nil},
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{"ReadAt", 8, rbs - 4, 0, "AAAABBBB", nil},
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{"ReadAt", 5, rbs - 4, 0, "AAAAB", nil},
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{"ReadAt", 2, rbs - 4, 0, "AA", nil},
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// Test seeking backwards from the Read offset.
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{"Seek", 0, 2*rbs - 8, os.SEEK_SET, strconv.Itoa(2*rbs - 8), nil},
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{"Read", 1, 0, 0, "B", nil},
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{"Read", 1, 0, 0, "B", nil},
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{"Read", 1, 0, 0, "B", nil},
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{"Read", 1, 0, 0, "B", nil},
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{"Read", 8, 0, 0, "BBBBCCCC", nil},
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}},
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{"longBlob.1", []step{
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// Test ReadAt with a slice larger than the buffer size.
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{"LargeReadAt", 2*rbs - 2, 0, 0, strconv.Itoa(2*rbs - 2), nil},
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{"LargeReadAt", 2*rbs - 1, 0, 0, strconv.Itoa(2*rbs - 1), nil},
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{"LargeReadAt", 2*rbs + 0, 0, 0, strconv.Itoa(2*rbs + 0), nil},
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{"LargeReadAt", 2*rbs + 1, 0, 0, strconv.Itoa(2*rbs + 1), nil},
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{"LargeReadAt", 2*rbs + 2, 0, 0, strconv.Itoa(2*rbs + 2), nil},
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{"LargeReadAt", 2*rbs - 2, 1, 0, strconv.Itoa(2*rbs - 2), nil},
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{"LargeReadAt", 2*rbs - 1, 1, 0, strconv.Itoa(2*rbs - 1), nil},
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{"LargeReadAt", 2*rbs + 0, 1, 0, strconv.Itoa(2*rbs + 0), nil},
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{"LargeReadAt", 2*rbs + 1, 1, 0, strconv.Itoa(2*rbs + 1), nil},
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{"LargeReadAt", 2*rbs + 2, 1, 0, strconv.Itoa(2*rbs + 2), nil},
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}},
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}
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func TestReader(t *testing.T) {
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for _, rt := range readerTest {
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c := aetesting.FakeSingleContext(t, "blobstore", "FetchData", fakeFetchData)
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r := NewReader(c, appengine.BlobKey(rt.blobKey))
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for i, step := range rt.step {
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var (
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got string
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gotErr error
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n int
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offset int64
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)
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switch step.method {
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case "LargeReadAt":
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p := make([]byte, step.lenp)
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n, gotErr = r.ReadAt(p, step.offset)
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got = strconv.Itoa(n)
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case "Read":
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p := make([]byte, step.lenp)
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n, gotErr = r.Read(p)
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got = string(p[:n])
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case "ReadAt":
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p := make([]byte, step.lenp)
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n, gotErr = r.ReadAt(p, step.offset)
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got = string(p[:n])
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case "Seek":
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offset, gotErr = r.Seek(step.offset, step.whence)
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got = strconv.FormatInt(offset, 10)
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default:
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t.Fatalf("unknown method: %s", step.method)
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}
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if gotErr != step.wantErr {
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t.Fatalf("%s step %d: got error %v want %v", rt.blobKey, i, gotErr, step.wantErr)
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}
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if got != step.want {
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t.Fatalf("%s step %d: got %q want %q", rt.blobKey, i, got, step.want)
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}
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}
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}
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}
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