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layer.go
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layer.go
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package test
import (
"archive/tar"
"bytes"
"context"
"crypto/rand"
"crypto/sha256"
"fmt"
"io"
"net/http"
"net/http/httptest"
"net/url"
"path"
"strconv"
"strings"
"sync"
"testing"
"time"
"github.com/quay/claircore"
"github.com/quay/claircore/test/fetch"
)
// AnyDescription is pre-made [LayerDescription] for cases where the actual
// contents of the description *shouldn't* matter.
var AnyDescription = claircore.LayerDescription{
Digest: `sha256:` + strings.Repeat(`deadbeef`, 8),
URI: `example:test.AnyDescription`,
MediaType: MediaType,
Headers: make(map[string][]string),
}
type layerserver struct {
now time.Time
blobs []*bytes.Reader
}
func (l *layerserver) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ns := path.Base(r.URL.Path)
n, err := strconv.Atoi(ns)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
if n < 0 || n >= len(l.blobs) {
w.WriteHeader(http.StatusNotFound)
return
}
w.Header().Set("content-type", "application/vnd.oci.image.layer.v1.tar")
http.ServeContent(w, r, "layer.tar", l.now, l.blobs[n])
}
// ServeLayers constructs "n" random layers, arranges to serve them, and returns
// corresponding LayerDescriptions.
func ServeLayers(t *testing.T, n int) (*http.Client, []claircore.LayerDescription) {
const filesize = 32
lsrv := &layerserver{
now: time.Now(),
blobs: make([]*bytes.Reader, n),
}
descs := make([]claircore.LayerDescription, n)
srv := httptest.NewServer(lsrv)
t.Cleanup(func() {
srv.CloseClientConnections()
srv.Close()
})
u, err := url.Parse(srv.URL)
if err != nil {
t.Fatal(err)
}
for i := 0; i < n; i++ {
buf := &bytes.Buffer{}
h := sha256.New()
w := tar.NewWriter(io.MultiWriter(buf, h))
u, err := u.Parse(strconv.Itoa(i))
if err != nil {
t.Fatal(err)
}
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeReg,
Name: "./randomfile",
Size: filesize,
Mode: 0755,
Uid: 1000,
Gid: 1000,
ModTime: lsrv.now,
}); err != nil {
t.Fatal(err)
}
if _, err := io.Copy(w, io.LimitReader(rand.Reader, filesize)); err != nil {
t.Fatal(err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
lsrv.blobs[i] = bytes.NewReader(buf.Bytes())
d := &descs[i]
d.MediaType = "application/vnd.oci.image.layer.v1.tar"
d.Headers = make(http.Header)
d.URI = u.String()
d.Digest = fmt.Sprintf("sha256:%x", h.Sum(nil))
}
return srv.Client(), descs
}
// RealizeLayers uses fetch.Layer to populate a directory and returns a slice of Layers describing them.
//
// Any needed cleanup is handled via the passed [testing.T].
func RealizeLayers(ctx context.Context, t *testing.T, refs ...LayerRef) []claircore.Layer {
ret := make([]claircore.Layer, len(refs))
fetchCh := make(chan int)
var wg sync.WaitGroup
for i := 0; i < 3; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for n := range fetchCh {
id, err := claircore.ParseDigest(refs[n].Digest)
if err != nil {
t.Error(err)
continue
}
f, err := fetch.Layer(ctx, t, refs[n].Registry, refs[n].Name, id)
if err != nil {
t.Error(err)
continue
}
t.Cleanup(func() {
if err := f.Close(); err != nil {
t.Errorf("closing %q: %v", f.Name(), err)
}
})
desc := claircore.LayerDescription{
URI: "file:///dev/null",
Digest: id.String(),
// Bit of bad coupling seeping in here: all tar-based layers
// are handled the same, so this doesn't matter as long as
// it's a tar.
MediaType: MediaType,
}
if err := ret[n].Init(ctx, &desc, f); err != nil {
t.Error(err)
}
t.Cleanup(func() {
l := &ret[n]
if err := l.Close(); err != nil {
t.Errorf("closing %q: %v", l.Hash, err)
}
})
}
}()
}
for n := 0; n < len(refs); n++ {
fetchCh <- n
}
close(fetchCh)
wg.Wait()
return ret
}
// RealizeLayer is a helper around [RealizeLayers] for a single layer.
//
// This is useful for testing a Scanner implementation.
func RealizeLayer(ctx context.Context, t *testing.T, ref LayerRef) *claircore.Layer {
t.Helper()
ls := RealizeLayers(ctx, t, ref)
return &ls[0]
}