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ec4f849079
FS implements Chonk, and given the expected load characteristics (frequent use of AUM() + ChildAUMs(), and infrequent use of Heads() + CommitVerifiedAUMs()), the implementation avoids scanning the filesystem to service AUM() and ChildAUMs(). Signed-off-by: Tom DNetto <tom@tailscale.com>
159 lines
4.3 KiB
Go
159 lines
4.3 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tka
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import (
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"fmt"
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"os"
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"path/filepath"
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"testing"
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"github.com/google/go-cmp/cmp"
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"golang.org/x/crypto/blake2s"
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)
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// randHash derives a fake blake2s hash from the test name
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// and the given seed.
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func randHash(t *testing.T, seed int64) [blake2s.Size]byte {
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var out [blake2s.Size]byte
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testingRand(t, seed).Read(out[:])
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return out
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}
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func TestImplementsChonk(t *testing.T) {
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impls := []Chonk{&Mem{}, &FS{}}
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t.Logf("chonks: %v", impls)
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}
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func TestTailchonk_ChildAUMs(t *testing.T) {
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for _, chonk := range []Chonk{&Mem{}, &FS{base: t.TempDir()}} {
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t.Run(fmt.Sprintf("%T", chonk), func(t *testing.T) {
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parentHash := randHash(t, 1)
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data := []AUM{
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{
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MessageKind: AUMRemoveKey,
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KeyID: []byte{1, 2},
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PrevAUMHash: parentHash[:],
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},
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{
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MessageKind: AUMRemoveKey,
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KeyID: []byte{3, 4},
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PrevAUMHash: parentHash[:],
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},
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}
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if err := chonk.CommitVerifiedAUMs(data); err != nil {
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t.Fatalf("CommitVerifiedAUMs failed: %v", err)
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}
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stored, err := chonk.ChildAUMs(parentHash)
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if err != nil {
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t.Fatalf("ChildAUMs failed: %v", err)
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}
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if diff := cmp.Diff(data, stored); diff != "" {
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t.Errorf("stored AUM differs (-want, +got):\n%s", diff)
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}
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})
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}
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}
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func TestTailchonkMem_Orphans(t *testing.T) {
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chonk := Mem{}
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parentHash := randHash(t, 1)
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orphan := AUM{MessageKind: AUMNoOp}
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aums := []AUM{
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orphan,
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// A parent is specified, so we shouldnt see it in GetOrphans()
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{
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MessageKind: AUMRemoveKey,
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KeyID: []byte{3, 4},
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PrevAUMHash: parentHash[:],
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},
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}
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if err := chonk.CommitVerifiedAUMs(aums); err != nil {
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t.Fatalf("CommitVerifiedAUMs failed: %v", err)
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}
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stored, err := chonk.Orphans()
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if err != nil {
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t.Fatalf("Orphans failed: %v", err)
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}
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if diff := cmp.Diff([]AUM{orphan}, stored); diff != "" {
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t.Errorf("stored AUM differs (-want, +got):\n%s", diff)
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}
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}
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func TestTailchonk_ReadChainFromHead(t *testing.T) {
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for _, chonk := range []Chonk{&Mem{}, &FS{base: t.TempDir()}} {
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t.Run(fmt.Sprintf("%T", chonk), func(t *testing.T) {
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genesis := AUM{MessageKind: AUMRemoveKey, KeyID: []byte{1, 2}}
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gHash := genesis.Hash()
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intermediate := AUM{PrevAUMHash: gHash[:]}
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iHash := intermediate.Hash()
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leaf := AUM{PrevAUMHash: iHash[:]}
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commitSet := []AUM{
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genesis,
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intermediate,
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leaf,
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}
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if err := chonk.CommitVerifiedAUMs(commitSet); err != nil {
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t.Fatalf("CommitVerifiedAUMs failed: %v", err)
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}
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// t.Logf("genesis hash = %X", genesis.Hash())
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// t.Logf("intermediate hash = %X", intermediate.Hash())
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// t.Logf("leaf hash = %X", leaf.Hash())
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// Read the chain from the leaf backwards.
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gotLeafs, err := chonk.Heads()
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if err != nil {
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t.Fatalf("Heads failed: %v", err)
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}
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if diff := cmp.Diff([]AUM{leaf}, gotLeafs); diff != "" {
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t.Fatalf("leaf AUM differs (-want, +got):\n%s", diff)
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}
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parent, _ := gotLeafs[0].Parent()
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gotIntermediate, err := chonk.AUM(parent)
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if err != nil {
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t.Fatalf("AUM(<intermediate>) failed: %v", err)
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}
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if diff := cmp.Diff(intermediate, gotIntermediate); diff != "" {
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t.Errorf("intermediate AUM differs (-want, +got):\n%s", diff)
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}
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parent, _ = gotIntermediate.Parent()
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gotGenesis, err := chonk.AUM(parent)
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if err != nil {
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t.Fatalf("AUM(<genesis>) failed: %v", err)
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}
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if diff := cmp.Diff(genesis, gotGenesis); diff != "" {
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t.Errorf("genesis AUM differs (-want, +got):\n%s", diff)
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}
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})
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}
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}
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func TestTailchonkFS_Commit(t *testing.T) {
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chonk := &FS{base: t.TempDir()}
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parentHash := randHash(t, 1)
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aum := AUM{MessageKind: AUMNoOp, PrevAUMHash: parentHash[:]}
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if err := chonk.CommitVerifiedAUMs([]AUM{aum}); err != nil {
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t.Fatal(err)
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}
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if got, want := chonk.filename(aum.Hash()), "HJX3LPJJQVRFSQX4QONESBU4DUO5JPORA66ZUCFS6NHZWDZTP4"; got != want {
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t.Errorf("aum filename = %q, want %q", got, want)
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}
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if _, err := os.Stat(filepath.Join(chonk.base, "ad", "HJX3LPJJQVRFSQX4QONESBU4DUO5JPORA66ZUCFS6NHZWDZTP4")); err != nil {
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t.Errorf("stat of AUM file failed: %v", err)
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}
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if _, err := os.Stat(filepath.Join(chonk.base, "67", "226TIYPDKQWKFD5MXUI3GRVDSDFXRBABNINTFIT5ADMCLZ464U")); err != nil {
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t.Errorf("stat of AUM parent failed: %v", err)
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}
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}
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