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epochStartMetaBlockInterceptor.go
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/
epochStartMetaBlockInterceptor.go
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package interceptors
import (
"fmt"
"sync"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-core/data/block"
"github.com/ElrondNetwork/elrond-go-core/hashing"
"github.com/ElrondNetwork/elrond-go-core/marshal"
"github.com/ElrondNetwork/elrond-go/p2p"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/process/factory"
)
// ArgsEpochStartMetaBlockInterceptor holds the arguments needed for creating a new epochStartMetaBlockInterceptor
type ArgsEpochStartMetaBlockInterceptor struct {
Marshalizer marshal.Marshalizer
Hasher hashing.Hasher
NumConnectedPeersProvider process.NumConnectedPeersProvider
ConsensusPercentage int
}
type epochStartMetaBlockInterceptor struct {
marshalizer marshal.Marshalizer
hasher hashing.Hasher
numConnectedPeersProvider process.NumConnectedPeersProvider
consensusPercentage float32
mutReceivedMetaBlocks sync.RWMutex
mapReceivedMetaBlocks map[string]*block.MetaBlock
mapMetaBlocksFromPeers map[string][]core.PeerID
registeredHandlers []func(topic string, hash []byte, data interface{})
mutHandlers sync.RWMutex
}
// NewEpochStartMetaBlockInterceptor returns a new instance of epochStartMetaBlockInterceptor
func NewEpochStartMetaBlockInterceptor(args ArgsEpochStartMetaBlockInterceptor) (*epochStartMetaBlockInterceptor, error) {
err := checkArgs(args)
if err != nil {
return nil, err
}
consensusPercentageFloat := float32(args.ConsensusPercentage) / 100.0
return &epochStartMetaBlockInterceptor{
marshalizer: args.Marshalizer,
hasher: args.Hasher,
numConnectedPeersProvider: args.NumConnectedPeersProvider,
consensusPercentage: consensusPercentageFloat,
mapReceivedMetaBlocks: make(map[string]*block.MetaBlock),
mapMetaBlocksFromPeers: make(map[string][]core.PeerID),
registeredHandlers: make([]func(topic string, hash []byte, data interface{}), 0),
}, nil
}
// ProcessReceivedMessage will handle received messages containing epoch start meta blocks
func (e *epochStartMetaBlockInterceptor) ProcessReceivedMessage(message p2p.MessageP2P, fromConnectedPeer core.PeerID) error {
var epochStartMb block.MetaBlock
err := e.marshalizer.Unmarshal(&epochStartMb, message.Data())
if err != nil {
return err
}
mbHash, err := core.CalculateHash(e.marshalizer, e.hasher, epochStartMb)
if err != nil {
return err
}
if !epochStartMb.IsStartOfEpochBlock() {
log.Trace("epochStartMetaBlockInterceptor-ProcessReceivedMessage: received meta block is not of "+
"type epoch start meta block", "hash", mbHash)
return process.ErrNotEpochStartBlock
}
log.Trace("received epoch start meta", "epoch", epochStartMb.GetEpoch(), "from peer", fromConnectedPeer.Pretty())
e.mutReceivedMetaBlocks.Lock()
e.mapReceivedMetaBlocks[string(mbHash)] = &epochStartMb
e.addToPeerList(string(mbHash), fromConnectedPeer)
e.mutReceivedMetaBlocks.Unlock()
metaBlock, found := e.checkMaps()
if !found {
return nil
}
e.handleFoundEpochStartMetaBlock(metaBlock)
return nil
}
// this func should be called under mutex protection
func (e *epochStartMetaBlockInterceptor) addToPeerList(hash string, peer core.PeerID) {
peersListForHash := e.mapMetaBlocksFromPeers[hash]
for _, pid := range peersListForHash {
if pid == peer {
return
}
}
e.mapMetaBlocksFromPeers[hash] = append(e.mapMetaBlocksFromPeers[hash], peer)
}
func (e *epochStartMetaBlockInterceptor) checkMaps() (*block.MetaBlock, bool) {
e.mutReceivedMetaBlocks.RLock()
defer e.mutReceivedMetaBlocks.RUnlock()
numConnectedPeers := len(e.numConnectedPeersProvider.ConnectedPeers())
numPeersTarget := int(float32(numConnectedPeers) * e.consensusPercentage)
for hash, peersList := range e.mapMetaBlocksFromPeers {
log.Trace("metablock from peers", "num peers", len(peersList), "hash", []byte(hash))
metaBlock, found := e.processEntry(peersList, hash, numPeersTarget)
if found {
return metaBlock, true
}
}
return nil, false
}
func (e *epochStartMetaBlockInterceptor) processEntry(
peersList []core.PeerID,
hash string,
numPeersTarget int,
) (*block.MetaBlock, bool) {
if len(peersList) >= numPeersTarget {
log.Debug("got consensus for epoch start metablock", "len", len(peersList))
return e.mapReceivedMetaBlocks[hash], true
}
return nil, false
}
// SetInterceptedDebugHandler won't do anything
func (e *epochStartMetaBlockInterceptor) SetInterceptedDebugHandler(_ process.InterceptedDebugger) error {
return nil
}
// RegisterHandler will append the handler to the slice so it will be called when the epoch start meta block is fetched
func (e *epochStartMetaBlockInterceptor) RegisterHandler(handler func(topic string, hash []byte, data interface{})) {
if handler == nil {
return
}
e.mutHandlers.Lock()
e.registeredHandlers = append(e.registeredHandlers, handler)
e.mutHandlers.Unlock()
}
func (e *epochStartMetaBlockInterceptor) handleFoundEpochStartMetaBlock(metaBlock *block.MetaBlock) {
e.mutHandlers.RLock()
for _, handler := range e.registeredHandlers {
handler(factory.MetachainBlocksTopic, []byte(""), metaBlock)
}
e.mutHandlers.RUnlock()
e.resetMaps()
}
func (e *epochStartMetaBlockInterceptor) resetMaps() {
e.mutReceivedMetaBlocks.Lock()
e.mapMetaBlocksFromPeers = make(map[string][]core.PeerID)
e.mapReceivedMetaBlocks = make(map[string]*block.MetaBlock)
e.mutReceivedMetaBlocks.Unlock()
}
// Close returns nil
func (e *epochStartMetaBlockInterceptor) Close() error {
return nil
}
// IsInterfaceNil returns true if there is no value under the interface
func (e *epochStartMetaBlockInterceptor) IsInterfaceNil() bool {
return e == nil
}
func checkArgs(args ArgsEpochStartMetaBlockInterceptor) error {
if check.IfNil(args.Marshalizer) {
return wrapArgsError(process.ErrNilMarshalizer)
}
if check.IfNil(args.Hasher) {
return wrapArgsError(process.ErrNilHasher)
}
if check.IfNil(args.NumConnectedPeersProvider) {
return wrapArgsError(process.ErrNilNumConnectedPeersProvider)
}
if !(args.ConsensusPercentage >= 0 && args.ConsensusPercentage <= 100) {
return wrapArgsError(process.ErrInvalidEpochStartMetaBlockConsensusPercentage)
}
return nil
}
func wrapArgsError(err error) error {
return fmt.Errorf("%w when creating epochStartMetaBlockInterceptor", err)
}