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admin.go
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admin.go
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// Copyright 2018 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cloudspanner
import (
"context"
"fmt"
"sync"
"time"
"cloud.google.com/go/spanner"
"github.com/google/trillian"
"github.com/google/trillian/storage"
"github.com/google/trillian/storage/cloudspanner/spannerpb"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/durationpb"
"google.golang.org/protobuf/types/known/timestamppb"
"k8s.io/klog/v2"
)
var (
// NumUnseqBuckets is the length of the unsequenced time ring buffer.
NumUnseqBuckets = int64(4)
// NumMerkleBuckets is the number of individual buckets below each unsequenced ring buffer.
NumMerkleBuckets = int64(16)
// TimeNow is the function used to get the current time. Exposed so it may be mocked by tests.
TimeNow = time.Now
treeStateMap = map[trillian.TreeState]spannerpb.TreeState{
trillian.TreeState_ACTIVE: spannerpb.TreeState_ACTIVE,
trillian.TreeState_FROZEN: spannerpb.TreeState_FROZEN,
}
treeTypeMap = map[trillian.TreeType]spannerpb.TreeType{
trillian.TreeType_LOG: spannerpb.TreeType_LOG,
trillian.TreeType_PREORDERED_LOG: spannerpb.TreeType_PREORDERED_LOG,
}
treeStateReverseMap = reverseTreeStateMap(treeStateMap)
treeTypeReverseMap = reverseTreeTypeMap(treeTypeMap)
)
const nanosPerMilli = int64(time.Millisecond / time.Nanosecond)
func reverseTreeStateMap(m map[trillian.TreeState]spannerpb.TreeState) map[spannerpb.TreeState]trillian.TreeState {
reverse := make(map[spannerpb.TreeState]trillian.TreeState)
for k, v := range m {
if x, ok := reverse[v]; ok {
klog.Fatalf("Duplicate values for key %v: %v and %v", v, x, k)
}
reverse[v] = k
}
return reverse
}
func reverseTreeTypeMap(m map[trillian.TreeType]spannerpb.TreeType) map[spannerpb.TreeType]trillian.TreeType {
reverse := make(map[spannerpb.TreeType]trillian.TreeType)
for k, v := range m {
if x, ok := reverse[v]; ok {
klog.Fatalf("Duplicate values for key %v: %v and %v", v, x, k)
}
reverse[v] = k
}
return reverse
}
// adminTX implements both storage.ReadOnlyAdminTX and storage.AdminTX.
type adminTX struct {
client *spanner.Client
// mu guards tx, but it's only actively used for Commit/Close. In other
// scenarios we trust Spanner to blow up if you try to use a closed tx.
//
// Note that, if tx is a spanner.SnapshotTransaction, it'll be set to nil
// when adminTX is closed.
mu sync.RWMutex
// tx is either spanner.ReadOnlyTransaction or spanner.ReadWriteTransaction,
// according to the role adminTX is meant to fill.
//
// If tx is a snapshot transaction it'll be set to nil when adminTX is closed
// to avoid reuse.
tx spanRead
}
// adminStorage implements storage.AdminStorage.
type adminStorage struct {
client *spanner.Client
}
// NewAdminStorage returns a Spanner-based storage.AdminStorage implementation.
func NewAdminStorage(client *spanner.Client) storage.AdminStorage {
return &adminStorage{client}
}
// CheckDatabaseAccessible implements AdminStorage.CheckDatabaseAccessible.
func (s *adminStorage) CheckDatabaseAccessible(ctx context.Context) error {
return checkDatabaseAccessible(ctx, s.client)
}
// Snapshot implements AdminStorage.Snapshot.
func (s *adminStorage) Snapshot(ctx context.Context) (storage.ReadOnlyAdminTX, error) {
tx := s.client.ReadOnlyTransaction()
return &adminTX{client: s.client, tx: tx}, nil
}
// Begin implements AdminStorage.Begin.
func (s *adminStorage) Begin(ctx context.Context) (storage.AdminTX, error) {
return nil, ErrNotImplemented
}
// ReadWriteTransaction implements AdminStorage.ReadWriteTransaction.
func (s *adminStorage) ReadWriteTransaction(ctx context.Context, f storage.AdminTXFunc) error {
_, err := s.client.ReadWriteTransaction(ctx, func(ctx context.Context, stx *spanner.ReadWriteTransaction) error {
tx := &adminTX{client: s.client, tx: stx}
return f(ctx, tx)
})
return err
}
// Commit implements ReadOnlyAdminTX.Commit.
func (t *adminTX) Commit() error {
return t.Close()
}
// Close implements ReadOnlyAdminTX.Close.
func (t *adminTX) Close() error {
t.mu.Lock()
defer t.mu.Unlock()
if t.tx == nil {
return nil
}
// tx will be committed by ReadWriteTransaction(), so only close readonly tx here
if stx, ok := t.tx.(*spanner.ReadOnlyTransaction); ok {
klog.V(1).Infof("Closed admin %p", stx)
stx.Close()
}
t.tx = nil
return nil
}
// GetTree implements ReadOnlyAdminTX.GetTree.
func (t *adminTX) GetTree(ctx context.Context, treeID int64) (*trillian.Tree, error) {
info, err := t.getTreeInfo(ctx, treeID)
if err != nil {
return nil, err
}
return toTrillianTree(info)
}
func (t *adminTX) getTreeInfo(ctx context.Context, treeID int64) (*spannerpb.TreeInfo, error) {
cols := []string{
"TreeID",
"TreeState",
"TreeType",
"TreeInfo",
"Deleted",
"DeleteTimeMillis",
}
row, err := t.tx.ReadRow(ctx, "TreeRoots", spanner.Key{treeID}, cols)
switch {
case spanner.ErrCode(err) == codes.NotFound:
// Improve on the error message
return nil, status.Errorf(codes.NotFound, "tree %v not found", treeID)
case err != nil:
return nil, err
}
info := &spannerpb.TreeInfo{}
var infoBytes []byte
var tID, tState, tType int64
var deleted bool
var delMillis spanner.NullInt64
if err := row.Columns(
&tID,
&tState, // info.TreeState,
&tType, // info.TreeType,
&infoBytes,
&deleted,
&delMillis,
); err != nil {
return nil, err
}
if infoBytes != nil {
if err := proto.Unmarshal(infoBytes, info); err != nil {
return nil, err
}
}
if tID != info.TreeId {
return nil, fmt.Errorf("inconsistency, treeIDs don't match: %d != %d", tID, info.TreeId)
}
if treeID != tID {
return nil, fmt.Errorf("inconsistency, got treeID %d, want %d", tID, treeID)
}
// TODO(al): check other denormalisations are consistent too.
// Sanity checks
switch tt := info.TreeType; tt {
case spannerpb.TreeType_PREORDERED_LOG:
fallthrough
case spannerpb.TreeType_LOG:
if info.GetLogStorageConfig() == nil {
return nil, status.Errorf(codes.Internal, "corrupt TreeInfo %#v: LogStorageConfig is nil", treeID)
}
default:
return nil, status.Errorf(codes.Internal, "corrupt TreeInfo %#v: unexpected TreeType = %s", treeID, tt)
}
return info, nil
}
// ListTrees implements ReadOnlyAdminTX.ListTrees.
func (t *adminTX) ListTrees(ctx context.Context, includeDeleted bool) ([]*trillian.Tree, error) {
trees := []*trillian.Tree{}
err := t.readTrees(ctx, includeDeleted, false /* idOnly */, func(r *spanner.Row) error {
var infoBytes []byte
if err := r.Columns(&infoBytes); err != nil {
return err
}
info := &spannerpb.TreeInfo{}
if err := proto.Unmarshal(infoBytes, info); err != nil {
return err
}
tree, err := toTrillianTree(info)
if err != nil {
return err
}
trees = append(trees, tree)
return nil
})
return trees, err
}
func (t *adminTX) readTrees(ctx context.Context, includeDeleted, idOnly bool, f func(*spanner.Row) error) error {
var stmt spanner.Statement
if idOnly {
stmt = spanner.NewStatement("SELECT t.TreeID FROM TreeRoots t")
} else {
stmt = spanner.NewStatement("SELECT t.TreeInfo FROM TreeRoots t")
}
if !includeDeleted {
stmt.SQL += " WHERE t.Deleted = @deleted"
stmt.Params["deleted"] = false
}
rows := t.tx.Query(ctx, stmt)
return rows.Do(f)
}
// CreateTree implements AdminWriter.CreateTree.
func (t *adminTX) CreateTree(ctx context.Context, tree *trillian.Tree) (*trillian.Tree, error) {
if err := storage.ValidateTreeForCreation(ctx, tree); err != nil {
return nil, err
}
id, err := storage.NewTreeID()
if err != nil {
return nil, err
}
info, err := newTreeInfo(tree, id, TimeNow())
if err != nil {
return nil, err
}
infoBytes, err := proto.Marshal(info)
if err != nil {
return nil, err
}
m1 := spanner.Insert(
"TreeRoots",
[]string{
"TreeID",
"TreeState",
"TreeType",
"TreeInfo",
"Deleted",
},
[]interface{}{
info.TreeId,
int64(info.TreeState),
int64(info.TreeType),
infoBytes,
false,
})
stx, ok := t.tx.(*spanner.ReadWriteTransaction)
if !ok {
return nil, ErrWrongTXType
}
if err := stx.BufferWrite([]*spanner.Mutation{m1}); err != nil {
return nil, err
}
return toTrillianTree(info)
}
// newTreeInfo creates a new TreeInfo from a Tree. Meant to be used for new trees.
func newTreeInfo(tree *trillian.Tree, treeID int64, now time.Time) (*spannerpb.TreeInfo, error) {
ts, ok := treeStateMap[tree.TreeState]
if !ok {
return nil, status.Errorf(codes.Internal, "unexpected TreeState: %s", tree.TreeState)
}
tt, ok := treeTypeMap[tree.TreeType]
if !ok {
return nil, status.Errorf(codes.Internal, "unexpected TreeType: %s", tree.TreeType)
}
if err := tree.MaxRootDuration.CheckValid(); err != nil {
return nil, status.Errorf(codes.InvalidArgument, "malformed MaxRootDuration: %v", err)
}
maxRootDuration := tree.MaxRootDuration.AsDuration()
info := &spannerpb.TreeInfo{
TreeId: treeID,
Name: tree.DisplayName,
Description: tree.Description,
TreeState: ts,
TreeType: tt,
CreateTimeNanos: now.UnixNano(),
UpdateTimeNanos: now.UnixNano(),
MaxRootDurationMillis: int64(maxRootDuration / time.Millisecond),
}
switch tt := tree.TreeType; tt {
case trillian.TreeType_PREORDERED_LOG:
fallthrough
case trillian.TreeType_LOG:
config, err := logConfigOrDefault(tree)
if err != nil {
return nil, err
}
if err := validateLogStorageConfig(config); err != nil {
return nil, err
}
info.StorageConfig = &spannerpb.TreeInfo_LogStorageConfig{LogStorageConfig: config}
default:
return nil, fmt.Errorf("Unknown tree type %v", tt)
}
return info, nil
}
func logConfigOrDefault(tree *trillian.Tree) (*spannerpb.LogStorageConfig, error) {
settings, err := unmarshalSettings(tree)
if err != nil {
return nil, err
}
if settings == nil {
return &spannerpb.LogStorageConfig{
NumUnseqBuckets: NumUnseqBuckets,
NumMerkleBuckets: NumMerkleBuckets,
}, nil
}
config, ok := settings.(*spannerpb.LogStorageConfig)
if !ok {
return nil, status.Errorf(codes.Internal, "unsupported config type for LOG tree: %T", settings)
}
return config, nil
}
// UpdateTree implements AdminWriter.UpdateTree.
func (t *adminTX) UpdateTree(ctx context.Context, treeID int64, updateFunc func(*trillian.Tree)) (*trillian.Tree, error) {
info, err := t.getTreeInfo(ctx, treeID)
if err != nil {
return nil, err
}
tree, err := toTrillianTree(info)
if err != nil {
return nil, err
}
beforeTree := proto.Clone(tree).(*trillian.Tree)
updateFunc(tree)
if err = storage.ValidateTreeForUpdate(ctx, beforeTree, tree); err != nil {
return nil, err
}
if !proto.Equal(beforeTree.StorageSettings, tree.StorageSettings) {
return nil, status.New(codes.InvalidArgument, "readonly field changed: storage_settings").Err()
}
ts, ok := treeStateMap[tree.TreeState]
if !ok {
return nil, status.Errorf(codes.Internal, "unexpected TreeState: %s", tree.TreeState)
}
if err := tree.MaxRootDuration.CheckValid(); err != nil {
return nil, status.Errorf(codes.InvalidArgument, "malformed MaxRootDuration: %v", err)
}
maxRootDuration := tree.MaxRootDuration.AsDuration()
// Update (just) the mutable fields in treeInfo.
now := TimeNow()
info.TreeState = ts
info.Name = tree.DisplayName
info.Description = tree.Description
info.UpdateTimeNanos = now.UnixNano()
info.MaxRootDurationMillis = int64(maxRootDuration / time.Millisecond)
if err := t.updateTreeInfo(ctx, info); err != nil {
return nil, err
}
return toTrillianTree(info)
}
func (t *adminTX) updateTreeInfo(ctx context.Context, info *spannerpb.TreeInfo) error {
infoBytes, err := proto.Marshal(info)
if err != nil {
return err
}
m1 := spanner.Update(
"TreeRoots",
[]string{
"TreeID",
"TreeState",
"TreeType",
"TreeInfo",
"Deleted",
"DeleteTimeMillis",
},
[]interface{}{
info.TreeId,
int64(info.TreeState),
int64(info.TreeType),
infoBytes,
info.Deleted,
info.DeleteTimeNanos / nanosPerMilli,
})
stx, ok := t.tx.(*spanner.ReadWriteTransaction)
if !ok {
return ErrWrongTXType
}
return stx.BufferWrite([]*spanner.Mutation{m1})
}
// SoftDeleteTree implements AdminWriter.SoftDeleteTree.
func (t *adminTX) SoftDeleteTree(ctx context.Context, treeID int64) (*trillian.Tree, error) {
info, err := t.getTreeInfo(ctx, treeID)
if err != nil {
return nil, err
}
if info.Deleted {
return nil, status.Errorf(codes.FailedPrecondition, "tree %v already soft deleted", treeID)
}
info.Deleted = true
info.DeleteTimeNanos = TimeNow().UnixNano()
if err := t.updateTreeInfo(ctx, info); err != nil {
return nil, err
}
return toTrillianTree(info)
}
// HardDeleteTree implements AdminWriter.HardDeleteTree.
func (t *adminTX) HardDeleteTree(ctx context.Context, treeID int64) error {
info, err := t.getTreeInfo(ctx, treeID)
if err != nil {
return err
}
if !info.Deleted {
return status.Errorf(codes.FailedPrecondition, "tree %v is not soft deleted", treeID)
}
stx, ok := t.tx.(*spanner.ReadWriteTransaction)
if !ok {
return ErrWrongTXType
}
// Due to cloud spanner sizing recommendations, we don't interleave our tables
// which means no ON DELETE CASCADE goodies for us, so we have to
// transactionally delete related data from all tables.
return stx.BufferWrite([]*spanner.Mutation{
spanner.Delete("TreeRoots", spanner.Key{info.TreeId}),
spanner.Delete("TreeHeads", spanner.Key{info.TreeId}.AsPrefix()),
spanner.Delete("SubtreeData", spanner.Key{info.TreeId}.AsPrefix()),
spanner.Delete("LeafData", spanner.Key{info.TreeId}.AsPrefix()),
spanner.Delete("SequencedLeafData", spanner.Key{info.TreeId}.AsPrefix()),
spanner.Delete("Unsequenced", spanner.Key{info.TreeId}.AsPrefix()),
})
}
// UndeleteTree implements AdminWriter.UndeleteTree.
func (t *adminTX) UndeleteTree(ctx context.Context, treeID int64) (*trillian.Tree, error) {
info, err := t.getTreeInfo(ctx, treeID)
if err != nil {
return nil, err
}
if !info.Deleted {
return nil, status.Errorf(codes.FailedPrecondition, "tree %v is not soft deleted", treeID)
}
info.Deleted = false
info.DeleteTimeNanos = 0
if err := t.updateTreeInfo(ctx, info); err != nil {
return nil, err
}
return toTrillianTree(info)
}
func toTrillianTree(info *spannerpb.TreeInfo) (*trillian.Tree, error) {
createdPB := timestamppb.New(time.Unix(0, info.CreateTimeNanos))
updatedPB := timestamppb.New(time.Unix(0, info.UpdateTimeNanos))
if err := createdPB.CheckValid(); err != nil {
return nil, status.Errorf(codes.Internal, "failed to convert creation time: %v", err)
}
if err := updatedPB.CheckValid(); err != nil {
return nil, status.Errorf(codes.Internal, "failed to convert update time: %v", err)
}
tree := &trillian.Tree{
TreeId: info.TreeId,
DisplayName: info.Name,
Description: info.Description,
CreateTime: createdPB,
UpdateTime: updatedPB,
MaxRootDuration: durationpb.New(time.Duration(info.MaxRootDurationMillis) * time.Millisecond),
}
ts, ok := treeStateReverseMap[info.TreeState]
if !ok {
return nil, status.Errorf(codes.Internal, "unexpected TreeState: %s", info.TreeState)
}
tree.TreeState = ts
tt, ok := treeTypeReverseMap[info.TreeType]
if !ok {
return nil, status.Errorf(codes.Internal, "unexpected TreeType: %s", info.TreeType)
}
tree.TreeType = tt
var config proto.Message
switch tt := info.TreeType; tt {
case spannerpb.TreeType_PREORDERED_LOG:
fallthrough
case spannerpb.TreeType_LOG:
config = info.GetLogStorageConfig()
default:
return nil, fmt.Errorf("unknown tree type %v", tt)
}
settings, err := anypb.New(config)
if err != nil {
return nil, fmt.Errorf("anypb.New(): %w", err)
}
tree.StorageSettings = settings
if info.Deleted {
tree.Deleted = info.Deleted
}
if info.DeleteTimeNanos > 0 {
tree.DeleteTime = timestamppb.New(time.Unix(0, info.DeleteTimeNanos))
if err := tree.DeleteTime.CheckValid(); err != nil {
return nil, status.Errorf(codes.Internal, "failed to convert delete time: %v", err)
}
}
return tree, nil
}
// unmarshalSettings returns the message obtained from tree.StorageSettings.
// If tree.StorageSettings is nil no unmarshaling will be attempted; instead the method will return
// (nil, nil).
func unmarshalSettings(tree *trillian.Tree) (proto.Message, error) {
settings := tree.GetStorageSettings()
if settings == nil {
return nil, nil
}
any, err := settings.UnmarshalNew()
if err != nil {
return nil, err
}
return any, nil
}
func validateLogStorageConfig(config *spannerpb.LogStorageConfig) error {
if config.NumUnseqBuckets < 1 {
return status.Errorf(codes.InvalidArgument, "NumUnseqBuckets = %v, want > 0", config.NumUnseqBuckets)
}
if config.NumMerkleBuckets < 1 || config.NumMerkleBuckets > 256 {
return status.Errorf(codes.InvalidArgument, "NumMerkleBuckets = %v, want a number in range [1, 256]", config.NumMerkleBuckets)
}
return nil
}