forked from google/trillian
/
sequencer_manager.go
111 lines (93 loc) · 3.46 KB
/
sequencer_manager.go
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// Copyright 2016 Google Inc. 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 server
import (
"context"
"fmt"
"sync"
"time"
"github.com/golang/glog"
"github.com/golang/protobuf/ptypes"
"github.com/google/trillian"
"github.com/google/trillian/extension"
"github.com/google/trillian/log"
"github.com/google/trillian/merkle/hashers"
"github.com/google/trillian/trees"
tcrypto "github.com/google/trillian/crypto"
)
// SequencerManager provides sequencing operations for a collection of Logs.
type SequencerManager struct {
guardWindow time.Duration
registry extension.Registry
signers map[int64]*tcrypto.Signer
signersMutex sync.Mutex
}
var seqOpts = trees.NewGetOpts(trees.SequenceLog, trillian.TreeType_LOG, trillian.TreeType_PREORDERED_LOG)
// NewSequencerManager creates a new SequencerManager instance based on the provided KeyManager instance
// and guard window.
func NewSequencerManager(registry extension.Registry, gw time.Duration) *SequencerManager {
return &SequencerManager{
guardWindow: gw,
registry: registry,
signers: make(map[int64]*tcrypto.Signer),
}
}
// Name returns the name of the object.
func (s *SequencerManager) Name() string {
return "Sequencer"
}
// ExecutePass performs sequencing for the specified Log.
func (s *SequencerManager) ExecutePass(ctx context.Context, logID int64, info *LogOperationInfo) (int, error) {
// TODO(Martin2112): Honor the sequencing enabled in log parameters, needs an API change
// so deferring it
tree, err := trees.GetTree(ctx, s.registry.AdminStorage, logID, seqOpts)
if err != nil {
return 0, fmt.Errorf("error retrieving log %v: %v", logID, err)
}
ctx = trees.NewContext(ctx, tree)
hasher, err := hashers.NewLogHasher(tree.HashStrategy)
if err != nil {
return 0, fmt.Errorf("error getting hasher for log %v: %v", logID, err)
}
signer, err := s.getSigner(ctx, tree)
if err != nil {
return 0, fmt.Errorf("error getting signer for log %v: %v", logID, err)
}
sequencer := log.NewSequencer(hasher, info.TimeSource, s.registry.LogStorage, signer, s.registry.MetricFactory, s.registry.QuotaManager)
maxRootDuration, err := ptypes.Duration(tree.MaxRootDuration)
if err != nil {
glog.Warning("failed to parse tree.MaxRootDuration, using zero")
maxRootDuration = 0
}
leaves, err := sequencer.IntegrateBatch(ctx, tree, info.BatchSize, s.guardWindow, maxRootDuration)
if err != nil {
return 0, fmt.Errorf("failed to integrate batch for %v: %v", logID, err)
}
return leaves, nil
}
// getSigner returns a signer for the given tree.
// Signers are cached, so only one will be created per tree.
func (s *SequencerManager) getSigner(ctx context.Context, tree *trillian.Tree) (*tcrypto.Signer, error) {
s.signersMutex.Lock()
defer s.signersMutex.Unlock()
if signer, ok := s.signers[tree.GetTreeId()]; ok {
return signer, nil
}
signer, err := trees.Signer(ctx, tree)
if err != nil {
return nil, err
}
s.signers[tree.GetTreeId()] = signer
return signer, nil
}