/
pull.go
724 lines (649 loc) · 23 KB
/
pull.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
/*
版权所有IBM公司。保留所有权利。
SPDX许可证标识符:Apache-2.0
**/
package privdata
import (
"bytes"
"fmt"
"math"
"math/rand"
"sync"
"time"
"github.com/hyperledger/fabric/core/common/privdata"
"github.com/hyperledger/fabric/gossip/api"
"github.com/hyperledger/fabric/gossip/comm"
"github.com/hyperledger/fabric/gossip/common"
"github.com/hyperledger/fabric/gossip/discovery"
"github.com/hyperledger/fabric/gossip/filter"
privdatacommon "github.com/hyperledger/fabric/gossip/privdata/common"
"github.com/hyperledger/fabric/gossip/util"
fcommon "github.com/hyperledger/fabric/protos/common"
proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/pkg/errors"
"github.com/spf13/viper"
"go.uber.org/zap/zapcore"
)
const (
membershipPollingBackoff = time.Second
responseWaitTime = time.Second * 5
maxMembershipPollIterations = 5
btlPullMarginDefault = 10
)
//dig2pvtrwsetwithconfig(配置)
type Dig2PvtRWSetWithConfig map[privdatacommon.DigKey]*util.PrivateRWSetWithConfig
//定义支持API的privatedataretriever接口
//检索所需的私有数据
type PrivateDataRetriever interface {
//collectionrwset返回给定txid的collectionpvtreadwriteset字节数,并从临时存储返回集合。
CollectionRWSet(dig []*proto.PvtDataDigest, blockNum uint64) (Dig2PvtRWSetWithConfig, bool, error)
}
//八卦定义八卦模块为协调器提供的功能
type gossip interface {
//发送向远程对等发送消息
Send(msg *proto.GossipMessage, peers ...*comm.RemotePeer)
//peersofchannel返回被认为是活动的网络成员
//也订阅了给定的频道
PeersOfChannel(common.ChainID) []discovery.NetworkMember
//PeerFilter接收子通道SelectionCriteria并返回一个选择
//只有符合给定标准的对等身份,并且他们发布了自己的渠道参与
PeerFilter(channel common.ChainID, messagePredicate api.SubChannelSelectionCriteria) (filter.RoutingFilter, error)
//accept返回与某个谓词匹配的其他节点发送的消息的专用只读通道。
//如果passthrough为false,则消息将由八卦层预先处理。
//如果passthrough是真的,那么八卦层不会介入,消息也不会
//可用于将答复发送回发件人
Accept(acceptor common.MessageAcceptor, passThrough bool) (<-chan *proto.GossipMessage, <-chan proto.ReceivedMessage)
}
type puller struct {
pubSub *util.PubSub
stopChan chan struct{}
msgChan <-chan proto.ReceivedMessage
channel string
cs privdata.CollectionStore
btlPullMargin uint64
gossip
PrivateDataRetriever
CollectionAccessFactory
}
//new puller创建新的私有数据puller
func NewPuller(cs privdata.CollectionStore, g gossip, dataRetriever PrivateDataRetriever, factory CollectionAccessFactory, channel string) *puller {
p := &puller{
pubSub: util.NewPubSub(),
stopChan: make(chan struct{}),
channel: channel,
cs: cs,
btlPullMargin: getBtlPullMargin(),
gossip: g,
PrivateDataRetriever: dataRetriever,
CollectionAccessFactory: factory,
}
_, p.msgChan = p.Accept(func(o interface{}) bool {
msg := o.(proto.ReceivedMessage).GetGossipMessage()
if !bytes.Equal(msg.Channel, []byte(p.channel)) {
return false
}
return msg.IsPrivateDataMsg()
}, true)
go p.listen()
return p
}
func (p *puller) listen() {
for {
select {
case <-p.stopChan:
return
case msg := <-p.msgChan:
if msg == nil {
//通信模块停止,因此该通道
//关闭
return
}
if msg.GetGossipMessage().GetPrivateRes() != nil {
p.handleResponse(msg)
}
if msg.GetGossipMessage().GetPrivateReq() != nil {
p.handleRequest(msg)
}
}
}
}
func (p *puller) handleRequest(message proto.ReceivedMessage) {
logger.Debug("Got", message.GetGossipMessage(), "from", message.GetConnectionInfo().Endpoint)
message.Respond(&proto.GossipMessage{
Channel: []byte(p.channel),
Tag: proto.GossipMessage_CHAN_ONLY,
Nonce: message.GetGossipMessage().Nonce,
Content: &proto.GossipMessage_PrivateRes{
PrivateRes: &proto.RemotePvtDataResponse{
Elements: p.createResponse(message),
},
},
})
}
func (p *puller) createResponse(message proto.ReceivedMessage) []*proto.PvtDataElement {
authInfo := message.GetConnectionInfo().Auth
var returned []*proto.PvtDataElement
connectionEndpoint := message.GetConnectionInfo().Endpoint
defer func() {
logger.Debug("Returning", connectionEndpoint, len(returned), "elements")
}()
msg := message.GetGossipMessage()
//按块编号对所有摘要进行分组
block2dig := groupDigestsByBlockNum(msg.GetPrivateReq().Digests)
for blockNum, digests := range block2dig {
dig2rwSets, wasFetchedFromLedger, err := p.CollectionRWSet(digests, blockNum)
if err != nil {
logger.Warningf("could not obtain private collection rwset for block %d, because of %s, continue...", blockNum, err)
continue
}
returned = append(returned, p.filterNotEligible(dig2rwSets, wasFetchedFromLedger, fcommon.SignedData{
Identity: message.GetConnectionInfo().Identity,
Data: authInfo.SignedData,
Signature: authInfo.Signature,
}, connectionEndpoint)...)
}
return returned
}
//GroupDigestsbyblocknum按块序列号分组所有摘要
func groupDigestsByBlockNum(digests []*proto.PvtDataDigest) map[uint64][]*proto.PvtDataDigest {
results := make(map[uint64][]*proto.PvtDataDigest)
for _, dig := range digests {
results[dig.BlockSeq] = append(results[dig.BlockSeq], dig)
}
return results
}
func (p *puller) handleResponse(message proto.ReceivedMessage) {
msg := message.GetGossipMessage().GetPrivateRes()
logger.Debug("Got", msg, "from", message.GetConnectionInfo().Endpoint)
for _, el := range msg.Elements {
if el.Digest == nil {
logger.Warning("Got nil digest from", message.GetConnectionInfo().Endpoint, "aborting")
return
}
hash, err := el.Digest.Hash()
if err != nil {
logger.Warning("Failed hashing digest from", message.GetConnectionInfo().Endpoint, "aborting")
return
}
p.pubSub.Publish(hash, el)
}
}
func (p *puller) waitForMembership() []discovery.NetworkMember {
polIteration := 0
for {
members := p.PeersOfChannel(common.ChainID(p.channel))
if len(members) != 0 {
return members
}
polIteration++
if polIteration == maxMembershipPollIterations {
return nil
}
time.Sleep(membershipPollingBackoff)
}
}
func (p *puller) fetch(dig2src dig2sources) (*privdatacommon.FetchedPvtDataContainer, error) {
//ComputeFilters返回从摘要到路由筛选器的映射
dig2Filter, err := p.computeFilters(dig2src)
if err != nil {
return nil, errors.WithStack(err)
}
return p.fetchPrivateData(dig2Filter)
}
func (p *puller) FetchReconciledItems(dig2collectionConfig privdatacommon.Dig2CollectionConfig) (*privdatacommon.FetchedPvtDataContainer, error) {
//ComputeFilters返回从摘要到路由筛选器的映射
dig2Filter, err := p.computeReconciliationFilters(dig2collectionConfig)
if err != nil {
return nil, errors.WithStack(err)
}
return p.fetchPrivateData(dig2Filter)
}
func (p *puller) fetchPrivateData(dig2Filter digestToFilterMapping) (*privdatacommon.FetchedPvtDataContainer, error) {
//获取每个通道的对等点列表
allFilters := dig2Filter.flattenFilterValues()
members := p.waitForMembership()
logger.Debug("Total members in channel:", members)
members = filter.AnyMatch(members, allFilters...)
logger.Debug("Total members that fit some digest:", members)
if len(members) == 0 {
logger.Warning("Do not know any peer in the channel(", p.channel, ") that matches the policies , aborting")
return nil, errors.New("Empty membership")
}
members = randomizeMemberList(members)
res := &privdatacommon.FetchedPvtDataContainer{}
//将请求分发给对等方,并获取其所有消息的订阅
//MatchDigestTopeer返回一个对等点到Digests的映射,我们会要求它
var peer2digests peer2Digests
//我们希望收集所有表示为摘要的私有RWset
itemsLeftToCollect := len(dig2Filter)
//只要我们还有一些数据需要收集,新成员需要数据:
for itemsLeftToCollect > 0 && len(members) > 0 {
purgedPvt := p.getPurgedCollections(members, dig2Filter)
//需要从映射中删除清除的摘要
for _, dig := range purgedPvt {
res.PurgedElements = append(res.PurgedElements, &proto.PvtDataDigest{
TxId: dig.TxId,
BlockSeq: dig.BlockSeq,
SeqInBlock: dig.SeqInBlock,
Namespace: dig.Namespace,
Collection: dig.Collection,
})
//删除摘要,这样我们甚至不会尝试提取清除的数据
delete(dig2Filter, dig)
itemsLeftToCollect--
}
if itemsLeftToCollect == 0 {
logger.Debug("No items left to collect")
return res, nil
}
peer2digests, members = p.assignDigestsToPeers(members, dig2Filter)
if len(peer2digests) == 0 {
logger.Warning("No available peers for digests request, "+
"cannot pull missing private data for following digests [%+v], peer membership: [%+v]",
dig2Filter.digests(), members)
return res, nil
}
logger.Debug("Matched", len(dig2Filter), "digests to", len(peer2digests), "peer(s)")
subscriptions := p.scatterRequests(peer2digests)
responses := p.gatherResponses(subscriptions)
for _, resp := range responses {
if len(resp.Payload) == 0 {
logger.Debug("Got empty response for", resp.Digest)
continue
}
delete(dig2Filter, privdatacommon.DigKey{
TxId: resp.Digest.TxId,
BlockSeq: resp.Digest.BlockSeq,
SeqInBlock: resp.Digest.SeqInBlock,
Namespace: resp.Digest.Namespace,
Collection: resp.Digest.Collection,
})
itemsLeftToCollect--
}
res.AvailableElements = append(res.AvailableElements, responses...)
}
return res, nil
}
func (p *puller) gatherResponses(subscriptions []util.Subscription) []*proto.PvtDataElement {
var res []*proto.PvtDataElement
privateElements := make(chan *proto.PvtDataElement, len(subscriptions))
var wg sync.WaitGroup
wg.Add(len(subscriptions))
//侦听所有订阅,然后将其添加到单个通道中
for _, sub := range subscriptions {
go func(sub util.Subscription) {
defer wg.Done()
el, err := sub.Listen()
if err != nil {
return
}
privateElements <- el.(*proto.PvtDataElement)
}(sub)
}
//等待所有订阅返回或超时
wg.Wait()
//关闭通道,在迭代时不要阻塞它。
close(privateElements)
//聚合元素以将其作为切片返回
for el := range privateElements {
res = append(res, el)
}
return res
}
func (p *puller) scatterRequests(peersDigestMapping peer2Digests) []util.Subscription {
var subscriptions []util.Subscription
for peer, digests := range peersDigestMapping {
msg := &proto.GossipMessage{
Tag: proto.GossipMessage_CHAN_ONLY,
Channel: []byte(p.channel),
Nonce: util.RandomUInt64(),
Content: &proto.GossipMessage_PrivateReq{
PrivateReq: &proto.RemotePvtDataRequest{
Digests: digestsAsPointerSlice(digests),
},
},
}
//发送前订阅所有摘要
for _, dig := range msg.GetPrivateReq().Digests {
hash, err := dig.Hash()
if err != nil {
//不应该发生在我们自己建立这个信息的时候
logger.Warning("Failed creating digest", err)
continue
}
sub := p.pubSub.Subscribe(hash, responseWaitTime)
subscriptions = append(subscriptions, sub)
}
logger.Debug("Sending", peer.endpoint, "request", msg.GetPrivateReq().Digests)
p.Send(msg, peer.AsRemotePeer())
}
return subscriptions
}
type peer2Digests map[remotePeer][]proto.PvtDataDigest
type noneSelectedPeers []discovery.NetworkMember
func (p *puller) assignDigestsToPeers(members []discovery.NetworkMember, dig2Filter digestToFilterMapping) (peer2Digests, noneSelectedPeers) {
if logger.IsEnabledFor(zapcore.DebugLevel) {
logger.Debug("Matching", members, "to", dig2Filter.String())
}
res := make(map[remotePeer][]proto.PvtDataDigest)
//创建对等点和摘要之间的映射以请求
for dig, collectionFilter := range dig2Filter {
//查找首选对等机
selectedPeer := filter.First(members, collectionFilter.preferredPeer)
if selectedPeer == nil {
logger.Debug("No preferred peer found for", dig)
//找到集合中的某个对等点
selectedPeer = filter.First(members, collectionFilter.anyPeer)
}
if selectedPeer == nil {
logger.Debug("No peer matches txID", dig.TxId, "collection", dig.Collection)
continue
}
//将对等机添加到从对等机到摘要切片的映射
peer := remotePeer{pkiID: string(selectedPeer.PKIID), endpoint: selectedPeer.Endpoint}
res[peer] = append(res[peer], proto.PvtDataDigest{
TxId: dig.TxId,
BlockSeq: dig.BlockSeq,
SeqInBlock: dig.SeqInBlock,
Namespace: dig.Namespace,
Collection: dig.Collection,
})
}
var noneSelectedPeers []discovery.NetworkMember
for _, member := range members {
peer := remotePeer{endpoint: member.PreferredEndpoint(), pkiID: string(member.PKIid)}
if _, selected := res[peer]; !selected {
noneSelectedPeers = append(noneSelectedPeers, member)
}
}
return res, noneSelectedPeers
}
type collectionRoutingFilter struct {
anyPeer filter.RoutingFilter
preferredPeer filter.RoutingFilter
}
type digestToFilterMapping map[privdatacommon.DigKey]collectionRoutingFilter
func (dig2f digestToFilterMapping) flattenFilterValues() []filter.RoutingFilter {
var filters []filter.RoutingFilter
for _, f := range dig2f {
filters = append(filters, f.preferredPeer)
filters = append(filters, f.anyPeer)
}
return filters
}
func (dig2f digestToFilterMapping) digests() []proto.PvtDataDigest {
var digs []proto.PvtDataDigest
for d := range dig2f {
digs = append(digs, proto.PvtDataDigest{
TxId: d.TxId,
BlockSeq: d.BlockSeq,
SeqInBlock: d.SeqInBlock,
Namespace: d.Namespace,
Collection: d.Collection,
})
}
return digs
}
//字符串返回DigestToFilterMapping的字符串表示形式
func (dig2f digestToFilterMapping) String() string {
var buffer bytes.Buffer
collection2TxID := make(map[string][]string)
for dig := range dig2f {
collection2TxID[dig.Collection] = append(collection2TxID[dig.Collection], dig.TxId)
}
for col, txIDs := range collection2TxID {
buffer.WriteString(fmt.Sprintf("{%s: %v}", col, txIDs))
}
return buffer.String()
}
func (p *puller) computeFilters(dig2src dig2sources) (digestToFilterMapping, error) {
filters := make(map[privdatacommon.DigKey]collectionRoutingFilter)
for digest, sources := range dig2src {
anyPeerInCollection, err := p.getLatestCollectionConfigRoutingFilter(digest.Namespace, digest.Collection)
if err != nil {
return nil, errors.WithStack(err)
}
sources := sources
endorserPeer, err := p.PeerFilter(common.ChainID(p.channel), func(peerSignature api.PeerSignature) bool {
for _, endorsement := range sources {
if bytes.Equal(endorsement.Endorser, []byte(peerSignature.PeerIdentity)) {
return true
}
}
return false
})
if err != nil {
return nil, errors.WithStack(err)
}
filters[digest] = collectionRoutingFilter{
anyPeer: anyPeerInCollection,
preferredPeer: endorserPeer,
}
}
return filters, nil
}
func (p *puller) computeReconciliationFilters(dig2collectionConfig privdatacommon.Dig2CollectionConfig) (digestToFilterMapping, error) {
filters := make(map[privdatacommon.DigKey]collectionRoutingFilter)
for digest, originalCollectionConfig := range dig2collectionConfig {
anyPeerInCollection, err := p.getLatestCollectionConfigRoutingFilter(digest.Namespace, digest.Collection)
if err != nil {
return nil, err
}
originalConfigFilter, err := p.cs.AccessFilter(p.channel, originalCollectionConfig.MemberOrgsPolicy)
if err != nil {
return nil, err
}
if originalConfigFilter == nil {
return nil, errors.Errorf("Failed obtaining original collection filter for channel %s, config %s", p.channel, digest.Collection)
}
//获取创建丢失数据时集合配置中的对等方
peerFromDataCreation, err := p.getMatchAllRoutingFilter(originalConfigFilter)
if err != nil {
return nil, err
}
//更喜欢从数据创建时就在集合中的对等方,而不是稍后添加的对等方。
//假设对等机在集合配置中的时间越长,它拥有数据的机会就越大。
preferredPeer := func(member discovery.NetworkMember) bool {
return peerFromDataCreation(member) && anyPeerInCollection(member)
}
filters[digest] = collectionRoutingFilter{
anyPeer: anyPeerInCollection,
preferredPeer: preferredPeer,
}
}
return filters, nil
}
func (p *puller) getLatestCollectionConfigRoutingFilter(chaincode string, collection string) (filter.RoutingFilter, error) {
cc := fcommon.CollectionCriteria{
Channel: p.channel,
Collection: collection,
Namespace: chaincode,
}
latestCollectionConfig, err := p.cs.RetrieveCollectionAccessPolicy(cc)
if err != nil {
return nil, errors.WithMessage(err, fmt.Sprintf("failed obtaining collection policy for channel %s, chaincode %s, config %s", p.channel, chaincode, collection))
}
filt := latestCollectionConfig.AccessFilter()
if filt == nil {
return nil, errors.Errorf("Failed obtaining collection filter for channel %s, chaincode %s, collection %s", p.channel, chaincode, collection)
}
anyPeerInCollection, err := p.getMatchAllRoutingFilter(filt)
if err != nil {
return nil, err
}
return anyPeerInCollection, nil
}
func (p *puller) getMatchAllRoutingFilter(filt privdata.Filter) (filter.RoutingFilter, error) {
routingFilter, err := p.PeerFilter(common.ChainID(p.channel), func(peerSignature api.PeerSignature) bool {
return filt(fcommon.SignedData{
Signature: peerSignature.Signature,
Identity: peerSignature.PeerIdentity,
Data: peerSignature.Message,
})
})
return routingFilter, err
}
func (p *puller) getPurgedCollections(members []discovery.NetworkMember, dig2Filter digestToFilterMapping) []privdatacommon.DigKey {
var res []privdatacommon.DigKey
for dig := range dig2Filter {
purged, err := p.purgedFilter(dig)
if err != nil {
logger.Debug("Failed to obtain purged filter for digest %v", dig, "error", err)
continue
}
membersWithPurgedData := filter.AnyMatch(members, purged)
//至少一个对等机已清除数据
if len(membersWithPurgedData) > 0 {
logger.Debugf("Private data on channel [%s], chaincode [%s], collection name [%s] for txID = [%s],"+
"has been purged at peers [%v]", p.channel, dig.Namespace,
dig.Collection, dig.TxId, membersWithPurgedData)
res = append(res, dig)
}
}
return res
}
func (p *puller) purgedFilter(dig privdatacommon.DigKey) (filter.RoutingFilter, error) {
cc := fcommon.CollectionCriteria{
Channel: p.channel,
TxId: dig.TxId,
Collection: dig.Collection,
Namespace: dig.Namespace,
}
colPersistConfig, err := p.cs.RetrieveCollectionPersistenceConfigs(cc)
if err != nil {
return nil, errors.WithStack(err)
}
return func(peer discovery.NetworkMember) bool {
if peer.Properties == nil {
logger.Debugf("No properties provided for peer %s", peer.Endpoint)
return false
}
//btl等于零,语义为永不过期
if colPersistConfig.BlockToLive() == uint64(0) {
return false
}
//句柄溢出
expirationSeqNum := addWithOverflow(dig.BlockSeq, colPersistConfig.BlockToLive())
peerLedgerHeightWithMargin := addWithOverflow(peer.Properties.LedgerHeight, p.btlPullMargin)
isPurged := peerLedgerHeightWithMargin >= expirationSeqNum
if isPurged {
logger.Debugf("skipping peer [%s], since pvt for channel [%s], txID = [%s], "+
"collection [%s] has been purged or will soon be purged, BTL=[%d]",
peer.Endpoint, p.channel, cc.TxId, cc.Collection, colPersistConfig.BlockToLive())
}
return isPurged
}, nil
}
func (p *puller) filterNotEligible(dig2rwSets Dig2PvtRWSetWithConfig, shouldCheckLatestConfig bool, signedData fcommon.SignedData, endpoint string) []*proto.PvtDataElement {
var returned []*proto.PvtDataElement
for d, rwSets := range dig2rwSets {
if rwSets == nil {
logger.Errorf("No private rwset for [%s] channel, chaincode [%s], collection [%s], txID = [%s] is available, skipping...",
p.channel, d.Namespace, d.Collection, d.TxId)
continue
}
logger.Debug("Found", len(rwSets.RWSet), "for TxID", d.TxId, ", collection", d.Collection, "for", endpoint)
if len(rwSets.RWSet) == 0 {
continue
}
eligibleForCollection := shouldCheckLatestConfig && p.isEligibleByLatestConfig(p.channel, d.Collection, d.Namespace, signedData)
if !eligibleForCollection {
colAP, err := p.AccessPolicy(rwSets.CollectionConfig, p.channel)
if err != nil {
logger.Debug("No policy found for channel", p.channel, ", collection", d.Collection, "txID", d.TxId, ":", err, "skipping...")
continue
}
colFilter := colAP.AccessFilter()
if colFilter == nil {
logger.Debug("Collection ", d.Collection, " has no access filter, txID", d.TxId, "skipping...")
continue
}
eligibleForCollection = colFilter(signedData)
}
if !eligibleForCollection {
logger.Debug("Peer", endpoint, "isn't eligible for txID", d.TxId, "at collection", d.Collection)
continue
}
returned = append(returned, &proto.PvtDataElement{
Digest: &proto.PvtDataDigest{
TxId: d.TxId,
BlockSeq: d.BlockSeq,
Collection: d.Collection,
Namespace: d.Namespace,
SeqInBlock: d.SeqInBlock,
},
Payload: util.PrivateRWSets(rwSets.RWSet...),
})
}
return returned
}
func (p *puller) isEligibleByLatestConfig(channel string, collection string, chaincode string, signedData fcommon.SignedData) bool {
cc := fcommon.CollectionCriteria{
Channel: channel,
Collection: collection,
Namespace: chaincode,
}
latestCollectionConfig, err := p.cs.RetrieveCollectionAccessPolicy(cc)
if err != nil {
return false
}
collectionFilter := latestCollectionConfig.AccessFilter()
return collectionFilter(signedData)
}
func randomizeMemberList(members []discovery.NetworkMember) []discovery.NetworkMember {
rand.Seed(time.Now().UnixNano())
res := make([]discovery.NetworkMember, len(members))
for i, j := range rand.Perm(len(members)) {
res[i] = members[j]
}
return res
}
func digestsAsPointerSlice(digests []proto.PvtDataDigest) []*proto.PvtDataDigest {
res := make([]*proto.PvtDataDigest, len(digests))
for i, dig := range digests {
//重新引入dig变量进行分配
//每次迭代的新地址
dig := dig
res[i] = &dig
}
return res
}
type remotePeer struct {
endpoint string
pkiID string
}
//asremotepeer将此远程对等转换为comm.remotepeer
func (rp remotePeer) AsRemotePeer() *comm.RemotePeer {
return &comm.RemotePeer{
PKIID: common.PKIidType(rp.pkiID),
Endpoint: rp.endpoint,
}
}
func getBtlPullMargin() uint64 {
var result uint64
if viper.IsSet("peer.gossip.pvtData.btlPullMargin") {
btlMarginVal := viper.GetInt("peer.gossip.pvtData.btlPullMargin")
if btlMarginVal < 0 {
result = btlPullMarginDefault
} else {
result = uint64(btlMarginVal)
}
} else {
result = btlPullMarginDefault
}
return result
}
func addWithOverflow(a uint64, b uint64) uint64 {
res := a + b
if res < a {
return math.MaxUint64
}
return res
}