/
challenging.go
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/
challenging.go
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// Copyright (c) 2021 PaddlePaddle Authors. 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 challenging
import (
"context"
"io"
"time"
"github.com/PaddlePaddle/PaddleDTX/crypto/core/ecdsa"
"github.com/sirupsen/logrus"
"github.com/PaddlePaddle/PaddleDTX/xdb/blockchain"
"github.com/PaddlePaddle/PaddleDTX/xdb/config"
ctype "github.com/PaddlePaddle/PaddleDTX/xdb/engine/challenger/merkle/types"
"github.com/PaddlePaddle/PaddleDTX/xdb/engine/types"
)
const (
DefaultRequestInterval = time.Minute * 60
defaultAnswerInterval = time.Minute * 10
)
var (
logger = logrus.WithField("monitor", "challenging")
)
type ChallengeDB interface {
GenerateChallenge(sliceIdxList []int, interval int64) ([][]byte, [][]byte, int64, []byte, error)
// merkle Challenge
Setup(sliceData []byte, rangeAmount int) ([]ctype.RangeHash, error)
Save(cms []ctype.Material) error
Take(fileID string, sliceID string, nodeID []byte) (ctype.RangeHash, error)
GetChallengeConf() (string, types.PairingChallengeConf)
}
type SliceStorage interface {
Load(key string, index string) (io.ReadCloser, error)
}
type ProveStorage interface {
Load(key string) (io.ReadCloser, error)
}
type Blockchain interface {
ListFiles(opt *blockchain.ListFileOptions) ([]blockchain.File, error)
ListFileNs(opt *blockchain.ListNsOptions) ([]blockchain.Namespace, error)
ListChallengeRequests(opt *blockchain.ListChallengeOptions) ([]blockchain.Challenge, error)
ChallengeRequest(opt *blockchain.ChallengeRequestOptions) error
ChallengeAnswer(opt *blockchain.ChallengeAnswerOptions) ([]byte, error)
NodeOffline(opt *blockchain.NodeOperateOptions) error
}
type NewChallengingMonitorOptions struct {
PrivateKey ecdsa.PrivateKey
Blockchain Blockchain
ChallengeDB ChallengeDB
SliceStorage SliceStorage
ProveStorage ProveStorage
}
// ChallengingMonitor's main work is to publish challenge requests if local node is dataOwner-node,
// otherwise is to listen challenge requests and answer them in order to prove it's storing related files
type ChallengingMonitor struct {
PrivateKey ecdsa.PrivateKey
AnswerInterval time.Duration
RequestInterval time.Duration
blockchain Blockchain
challengeDB ChallengeDB
sliceStorage SliceStorage
proveStorage ProveStorage
doneLoopReqC chan struct{} //will be closed when LoopRequest breaks
doneLoopAnsC chan struct{} //will be closed when LoopAnswer breaks
}
func New(conf *config.MonitorConf, opt *NewChallengingMonitorOptions) (*ChallengingMonitor, error) {
requestInterval := DefaultRequestInterval
answerInterval := defaultAnswerInterval
logger.WithFields(logrus.Fields{
"request-interval": requestInterval.String(),
"answer-interval": answerInterval.String(),
}).Info("monitor initialize...")
cm := &ChallengingMonitor{
PrivateKey: opt.PrivateKey,
RequestInterval: requestInterval,
AnswerInterval: answerInterval,
blockchain: opt.Blockchain,
challengeDB: opt.ChallengeDB,
sliceStorage: opt.SliceStorage,
proveStorage: opt.ProveStorage,
}
return cm, nil
}
// StartChallengeRequest starts to publish challenge request
func (c *ChallengingMonitor) StartChallengeRequest(ctx context.Context) {
go c.loopRequest(ctx)
}
// StopChallengeRequest breaks loop
func (c *ChallengingMonitor) StopChallengeRequest() {
if c.doneLoopReqC == nil {
return
}
logger.Info("stops listening challenge request ...")
select {
case <-c.doneLoopReqC:
return
default:
}
<-c.doneLoopReqC
}
// StartChallengeAnswer starts to answer request
func (c *ChallengingMonitor) StartChallengeAnswer(ctx context.Context) {
go c.loopAnswer(ctx)
}
// StopChallengeAnswer breaks loop
func (c *ChallengingMonitor) StopChallengeAnswer() {
if c.doneLoopAnsC == nil {
return
}
logger.Info("stops answering request ...")
select {
case <-c.doneLoopAnsC:
return
default:
}
<-c.doneLoopAnsC
}