feat(tvix/store/protos): implement Size() and Digest() for Directory

This adds Size() and Digest() functions for the golang version.

Change-Id: If71445a9bb26100bb4076ac4f5c96945b33919f9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7325
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This commit is contained in:
Florian Klink 2022-11-19 23:21:13 +00:00 committed by flokli
parent 81fd9caf3e
commit c3fb6d2218
4 changed files with 251 additions and 0 deletions

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@ -0,0 +1,39 @@
package storev1
import (
"fmt"
"google.golang.org/protobuf/proto"
"lukechampine.com/blake3"
)
// The size of a directory is calculated by summing up the numbers of
// `directories`, `files` and `symlinks`, and for each directory, its size
// field.
func (d *Directory) Size() uint32 {
var size uint32
size = uint32(len(d.Files) + len(d.Symlinks))
for _, d := range d.Directories {
size += 1 + d.Size
}
return size
}
func (d *Directory) Digest() ([]byte, error) {
b, err := proto.MarshalOptions{
Deterministic: true,
}.Marshal(d)
if err != nil {
return nil, fmt.Errorf("error while marshalling directory: %w", err)
}
h := blake3.New(32, nil)
_, err = h.Write(b)
if err != nil {
return nil, fmt.Errorf("error writing to hasher: %w", err)
}
return h.Sum(nil), nil
}

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@ -0,0 +1,100 @@
package storev1_test
import (
"testing"
storev1pb "code.tvl.fyi/tvix/store/protos"
"github.com/stretchr/testify/assert"
)
var (
dummyDigest = []byte{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
}
)
func TestDirectorySize(t *testing.T) {
t.Run("empty", func(t *testing.T) {
d := storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{},
Files: []*storev1pb.FileNode{},
Symlinks: []*storev1pb.SymlinkNode{},
}
assert.Equal(t, uint32(0), d.Size())
})
t.Run("containing single empty directory", func(t *testing.T) {
d := storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{{
Name: "foo",
Digest: dummyDigest,
Size: 0,
}},
Files: []*storev1pb.FileNode{},
Symlinks: []*storev1pb.SymlinkNode{},
}
assert.Equal(t, uint32(1), d.Size())
})
t.Run("containing single non-empty directory", func(t *testing.T) {
d := storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{{
Name: "foo",
Digest: dummyDigest,
Size: 4,
}},
Files: []*storev1pb.FileNode{},
Symlinks: []*storev1pb.SymlinkNode{},
}
assert.Equal(t, uint32(5), d.Size())
})
t.Run("containing single file", func(t *testing.T) {
d := storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{},
Files: []*storev1pb.FileNode{{
Name: "foo",
Digest: dummyDigest,
Size: 42,
Executable: false,
}},
Symlinks: []*storev1pb.SymlinkNode{},
}
assert.Equal(t, uint32(1), d.Size())
})
t.Run("containing single symlink", func(t *testing.T) {
d := storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{},
Files: []*storev1pb.FileNode{},
Symlinks: []*storev1pb.SymlinkNode{{
Name: "foo",
Target: "bar",
}},
}
assert.Equal(t, uint32(1), d.Size())
})
}
func TestDirectoryDigest(t *testing.T) {
d := storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{},
Files: []*storev1pb.FileNode{},
Symlinks: []*storev1pb.SymlinkNode{},
}
dgst, err := d.Digest()
assert.NoError(t, err, "calling Digest() on a directory shouldn't error")
assert.Equal(t, []byte{
0xaf, 0x13, 0x49, 0xb9, 0xf5, 0xf9, 0xa1, 0xa6, 0xa0, 0x40, 0x4d, 0xea, 0x36, 0xdc,
0xc9, 0x49, 0x9b, 0xcb, 0x25, 0xc9, 0xad, 0xc1, 0x12, 0xb7, 0xcc, 0x9a, 0x93, 0xca,
0xe4, 0x1f, 0x32, 0x62,
}, dgst)
}

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@ -1,3 +1,19 @@
module code.tvl.fyi/tvix/store/protos
go 1.19
require (
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/golang/protobuf v1.5.2 // indirect
github.com/klauspost/cpuid/v2 v2.0.9 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/stretchr/testify v1.8.1 // indirect
golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
golang.org/x/text v0.4.0 // indirect
google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
google.golang.org/grpc v1.51.0 // indirect
google.golang.org/protobuf v1.28.1 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
lukechampine.com/blake3 v1.1.7 // indirect
)

96
tvix/store/protos/go.sum Normal file
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@ -0,0 +1,96 @@
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
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