130 lines
3.0 KiB
Go
130 lines
3.0 KiB
Go
/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package content
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import (
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"bytes"
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"context"
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_ "crypto/sha256" // required by go-digest
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"io"
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"strings"
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"testing"
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"github.com/containerd/containerd/errdefs"
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"github.com/opencontainers/go-digest"
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"github.com/stretchr/testify/assert"
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)
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type copySource struct {
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reader io.Reader
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size int64
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digest digest.Digest
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}
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func TestCopy(t *testing.T) {
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defaultSource := newCopySource("this is the source to copy")
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var testcases = []struct {
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name string
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source copySource
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writer fakeWriter
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expected string
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}{
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{
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name: "copy no offset",
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source: defaultSource,
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writer: fakeWriter{},
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expected: "this is the source to copy",
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},
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{
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name: "copy with offset from seeker",
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source: defaultSource,
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writer: fakeWriter{status: Status{Offset: 8}},
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expected: "the source to copy",
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},
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{
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name: "copy with offset from unseekable source",
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source: copySource{reader: bytes.NewBufferString("foobar"), size: 6},
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writer: fakeWriter{status: Status{Offset: 3}},
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expected: "bar",
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},
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{
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name: "commit already exists",
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source: newCopySource("this already exists"),
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writer: fakeWriter{commitFunc: func() error {
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return errdefs.ErrAlreadyExists
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}},
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expected: "this already exists",
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},
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}
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for _, testcase := range testcases {
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t.Run(testcase.name, func(t *testing.T) {
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err := Copy(context.Background(),
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&testcase.writer,
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testcase.source.reader,
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testcase.source.size,
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testcase.source.digest)
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assert.NoError(t, err)
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assert.Equal(t, testcase.source.digest, testcase.writer.committedDigest)
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assert.Equal(t, testcase.expected, testcase.writer.String())
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})
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}
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}
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func newCopySource(raw string) copySource {
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return copySource{
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reader: strings.NewReader(raw),
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size: int64(len(raw)),
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digest: digest.FromBytes([]byte(raw)),
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}
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}
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type fakeWriter struct {
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bytes.Buffer
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committedDigest digest.Digest
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status Status
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commitFunc func() error
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}
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func (f *fakeWriter) Close() error {
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f.Buffer.Reset()
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return nil
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}
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func (f *fakeWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...Opt) error {
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f.committedDigest = expected
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if f.commitFunc == nil {
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return nil
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}
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return f.commitFunc()
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}
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func (f *fakeWriter) Digest() digest.Digest {
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return f.committedDigest
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}
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func (f *fakeWriter) Status() (Status, error) {
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return f.status, nil
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}
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func (f *fakeWriter) Truncate(size int64) error {
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f.Buffer.Truncate(int(size))
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return nil
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}
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