3cfe9aede5
The Digest type will be fairly central for blob and layer management. The type presented in this package provides a number of core features that should enable reliable use within the registry. This commit will be followed by others that convert the storage layer and webapp to use this type as the primary layer/blob CAS identifier.
72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
package digest
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import (
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"bytes"
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"crypto/rand"
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"io"
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"os"
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"testing"
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"github.com/docker/docker-registry/common/testutil"
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)
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func TestDigestVerifier(t *testing.T) {
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p := make([]byte, 1<<20)
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rand.Read(p)
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digest, err := DigestBytes(p)
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if err != nil {
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t.Fatalf("unexpected error digesting bytes: %#v", err)
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}
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verifier := DigestVerifier(digest)
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io.Copy(verifier, bytes.NewReader(p))
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if !verifier.Verified() {
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t.Fatalf("bytes not verified")
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}
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tf, tarSum, err := testutil.CreateRandomTarFile()
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if err != nil {
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t.Fatalf("error creating tarfile: %v", err)
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}
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digest, err = DigestReader(tf)
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if err != nil {
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t.Fatalf("error digesting tarsum: %v", err)
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}
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if digest.String() != tarSum {
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t.Fatalf("unexpected digest: %q != %q", digest.String(), tarSum)
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}
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expectedSize, _ := tf.Seek(0, os.SEEK_END) // Get tar file size
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tf.Seek(0, os.SEEK_SET) // seek back
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// This is the most relevant example for the registry application. It's
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// effectively a read through pipeline, where the final sink is the digest
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// verifier.
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verifier = DigestVerifier(digest)
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lengthVerifier := LengthVerifier(expectedSize)
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rd := io.TeeReader(tf, lengthVerifier)
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io.Copy(verifier, rd)
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if !lengthVerifier.Verified() {
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t.Fatalf("verifier detected incorrect length")
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}
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if !verifier.Verified() {
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t.Fatalf("bytes not verified")
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}
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}
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// TODO(stevvooe): Add benchmarks to measure bytes/second throughput for
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// DigestVerifier. We should be tarsum/gzip limited for common cases but we
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// want to verify this.
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//
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// The relevant benchmarks for comparison can be run with the following
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// commands:
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//
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// go test -bench . crypto/sha1
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// go test -bench . github.com/docker/docker/pkg/tarsum
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//
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