115 lines
2.9 KiB
Go
115 lines
2.9 KiB
Go
package testutil
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import (
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"archive/tar"
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"bytes"
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"fmt"
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"io"
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mrand "math/rand"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/opencontainers/go-digest"
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)
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// CreateRandomTarFile creates a random tarfile, returning it as an
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// io.ReadSeeker along with its digest. An error is returned if there is a
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// problem generating valid content.
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func CreateRandomTarFile() (rs io.ReadSeeker, dgst digest.Digest, err error) {
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nFiles := mrand.Intn(10) + 10
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target := &bytes.Buffer{}
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wr := tar.NewWriter(target)
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// Perturb this on each iteration of the loop below.
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header := &tar.Header{
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Mode: 0644,
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ModTime: time.Now(),
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Typeflag: tar.TypeReg,
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Uname: "randocalrissian",
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Gname: "cloudcity",
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AccessTime: time.Now(),
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ChangeTime: time.Now(),
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}
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for fileNumber := 0; fileNumber < nFiles; fileNumber++ {
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fileSize := mrand.Int63n(1<<20) + 1<<20
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header.Name = fmt.Sprint(fileNumber)
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header.Size = fileSize
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if err := wr.WriteHeader(header); err != nil {
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return nil, "", err
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}
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randomData := make([]byte, fileSize)
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// Fill up the buffer with some random data.
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n, err := mrand.Read(randomData)
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if n != len(randomData) {
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return nil, "", fmt.Errorf("short read creating random reader: %v bytes != %v bytes", n, len(randomData))
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}
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if err != nil {
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return nil, "", err
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}
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nn, err := io.Copy(wr, bytes.NewReader(randomData))
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if nn != fileSize {
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return nil, "", fmt.Errorf("short copy writing random file to tar")
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}
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if err != nil {
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return nil, "", err
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}
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if err := wr.Flush(); err != nil {
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return nil, "", err
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}
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}
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if err := wr.Close(); err != nil {
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return nil, "", err
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}
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dgst = digest.FromBytes(target.Bytes())
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return bytes.NewReader(target.Bytes()), dgst, nil
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}
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// CreateRandomLayers returns a map of n digests. We don't particularly care
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// about the order of said digests (since they're all random anyway).
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func CreateRandomLayers(n int) (map[digest.Digest]io.ReadSeeker, error) {
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digestMap := map[digest.Digest]io.ReadSeeker{}
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for i := 0; i < n; i++ {
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rs, ds, err := CreateRandomTarFile()
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if err != nil {
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return nil, fmt.Errorf("unexpected error generating test layer file: %v", err)
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}
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dgst := digest.Digest(ds)
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digestMap[dgst] = rs
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}
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return digestMap, nil
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}
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// UploadBlobs lets you upload blobs to a repository
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func UploadBlobs(repository distribution.Repository, layers map[digest.Digest]io.ReadSeeker) error {
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ctx := context.Background()
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for digest, rs := range layers {
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wr, err := repository.Blobs(ctx).Create(ctx)
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if err != nil {
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return fmt.Errorf("unexpected error creating upload: %v", err)
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}
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if _, err := io.Copy(wr, rs); err != nil {
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return fmt.Errorf("unexpected error copying to upload: %v", err)
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}
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if _, err := wr.Commit(ctx, distribution.Descriptor{Digest: digest}); err != nil {
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return fmt.Errorf("unexpected error committinng upload: %v", err)
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}
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}
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return nil
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}
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