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blocksprovider.go
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/
blocksprovider.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package blocksprovider
import (
"math"
"sync/atomic"
"time"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/gossip/api"
gossipcommon "github.com/hyperledger/fabric/gossip/common"
"github.com/hyperledger/fabric/gossip/discovery"
"github.com/hyperledger/fabric/gossip/util"
"github.com/hyperledger/fabric/protos/common"
gossip_proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/hyperledger/fabric/protos/orderer"
)
// LedgerInfo an adapter to provide the interface to query
// the ledger committer for current ledger height
type LedgerInfo interface {
// LedgerHeight returns current local ledger height
LedgerHeight() (uint64, error)
}
// GossipServiceAdapter serves to provide basic functionality
// required from gossip service by delivery service
type GossipServiceAdapter interface {
// PeersOfChannel returns slice with members of specified channel
PeersOfChannel(gossipcommon.ChainID) []discovery.NetworkMember
// AddPayload adds payload to the local state sync buffer
AddPayload(chainID string, payload *gossip_proto.Payload) error
// Gossip the message across the peers
Gossip(msg *gossip_proto.GossipMessage)
}
// BlocksProvider used to read blocks from the ordering service
// for specified chain it subscribed to
type BlocksProvider interface {
// DeliverBlocks starts delivering and disseminating blocks
DeliverBlocks()
// UpdateClientEndpoints update endpoints
UpdateOrderingEndpoints(endpoints []string)
// Stop shutdowns blocks provider and stops delivering new blocks
Stop()
}
// BlocksDeliverer defines interface which actually helps
// to abstract the AtomicBroadcast_DeliverClient with only
// required method for blocks provider.
// This also decouples the production implementation of the gRPC stream
// from the code in order for the code to be more modular and testable.
type BlocksDeliverer interface {
// Recv retrieves a response from the ordering service
Recv() (*orderer.DeliverResponse, error)
// Send sends an envelope to the ordering service
Send(*common.Envelope) error
}
type streamClient interface {
BlocksDeliverer
// UpdateEndpoint update ordering service endpoints
UpdateEndpoints(endpoints []string)
// GetEndpoints
GetEndpoints() []string
// Close closes the stream and its underlying connection
Close()
// Disconnect disconnects from the remote node.
Disconnect()
}
// blocksProviderImpl the actual implementation for BlocksProvider interface
type blocksProviderImpl struct {
chainID string
client streamClient
gossip GossipServiceAdapter
mcs api.MessageCryptoService
done int32
wrongStatusThreshold int
}
const wrongStatusThreshold = 10
var maxRetryDelay = time.Second * 10
var logger = flogging.MustGetLogger("blocksProvider")
// NewBlocksProvider constructor function to create blocks deliverer instance
func NewBlocksProvider(chainID string, client streamClient, gossip GossipServiceAdapter, mcs api.MessageCryptoService) BlocksProvider {
return &blocksProviderImpl{
chainID: chainID,
client: client,
gossip: gossip,
mcs: mcs,
wrongStatusThreshold: wrongStatusThreshold,
}
}
// DeliverBlocks used to pull out blocks from the ordering service to
// distributed them across peers
func (b *blocksProviderImpl) DeliverBlocks() {
errorStatusCounter := 0
statusCounter := 0
defer b.client.Close()
for !b.isDone() {
msg, err := b.client.Recv()
if err != nil {
logger.Warningf("[%s] Receive error: %s", b.chainID, err.Error())
return
}
switch t := msg.Type.(type) {
case *orderer.DeliverResponse_Status:
if t.Status == common.Status_SUCCESS {
logger.Warningf("[%s] ERROR! Received success for a seek that should never complete", b.chainID)
return
}
if t.Status == common.Status_BAD_REQUEST || t.Status == common.Status_FORBIDDEN {
logger.Errorf("[%s] Got error %v", b.chainID, t)
errorStatusCounter++
if errorStatusCounter > b.wrongStatusThreshold {
logger.Criticalf("[%s] Wrong statuses threshold passed, stopping block provider", b.chainID)
return
}
} else {
errorStatusCounter = 0
logger.Warningf("[%s] Got error %v", b.chainID, t)
}
maxDelay := float64(maxRetryDelay)
currDelay := float64(time.Duration(math.Pow(2, float64(statusCounter))) * 100 * time.Millisecond)
time.Sleep(time.Duration(math.Min(maxDelay, currDelay)))
if currDelay < maxDelay {
statusCounter++
}
b.client.Disconnect()
continue
case *orderer.DeliverResponse_Block:
errorStatusCounter = 0
statusCounter = 0
blockNum := t.Block.Header.Number
marshaledBlock, err := proto.Marshal(t.Block)
if err != nil {
logger.Errorf("[%s] Error serializing block with sequence number %d, due to %s", b.chainID, blockNum, err)
continue
}
if err := b.mcs.VerifyBlock(gossipcommon.ChainID(b.chainID), blockNum, marshaledBlock); err != nil {
logger.Errorf("[%s] Error verifying block with sequnce number %d, due to %s", b.chainID, blockNum, err)
continue
}
numberOfPeers := len(b.gossip.PeersOfChannel(gossipcommon.ChainID(b.chainID)))
// Create payload with a block received
payload := createPayload(blockNum, marshaledBlock)
// Use payload to create gossip message
gossipMsg := createGossipMsg(b.chainID, payload)
logger.Debugf("[%s] Adding payload to local buffer, blockNum = [%d]", b.chainID, blockNum)
// Add payload to local state payloads buffer
if err := b.gossip.AddPayload(b.chainID, payload); err != nil {
logger.Warningf("Block [%d] received from ordering service wasn't added to payload buffer: %v", blockNum, err)
}
// Gossip messages with other nodes
logger.Debugf("[%s] Gossiping block [%d], peers number [%d]", b.chainID, blockNum, numberOfPeers)
if !b.isDone() {
b.gossip.Gossip(gossipMsg)
}
default:
logger.Warningf("[%s] Received unknown: %v", b.chainID, t)
return
}
}
}
// Stop stops blocks delivery provider
func (b *blocksProviderImpl) Stop() {
atomic.StoreInt32(&b.done, 1)
b.client.Close()
}
// UpdateOrderingEndpoints update endpoints of ordering service
func (b *blocksProviderImpl) UpdateOrderingEndpoints(endpoints []string) {
if !b.areEndpointsUpdated(endpoints) {
// No new endpoints for ordering service were provided
return
}
// We have got new set of endpoints, updating client
logger.Debug("Updating endpoint, to %s", endpoints)
b.client.UpdateEndpoints(endpoints)
logger.Debug("Disconnecting so endpoints update will take effect")
// We need to disconnect the client to make it reconnect back
// to newly updated endpoints
b.client.Disconnect()
}
func (b *blocksProviderImpl) areEndpointsUpdated(endpoints []string) bool {
if len(endpoints) != len(b.client.GetEndpoints()) {
return true
}
// Check that endpoints was actually updated
for _, endpoint := range endpoints {
if !util.Contains(endpoint, b.client.GetEndpoints()) {
// Found new endpoint
return true
}
}
// Nothing has changed
return false
}
// Check whenever provider is stopped
func (b *blocksProviderImpl) isDone() bool {
return atomic.LoadInt32(&b.done) == 1
}
func createGossipMsg(chainID string, payload *gossip_proto.Payload) *gossip_proto.GossipMessage {
gossipMsg := &gossip_proto.GossipMessage{
Nonce: 0,
Tag: gossip_proto.GossipMessage_CHAN_AND_ORG,
Channel: []byte(chainID),
Content: &gossip_proto.GossipMessage_DataMsg{
DataMsg: &gossip_proto.DataMessage{
Payload: payload,
},
},
}
return gossipMsg
}
func createPayload(seqNum uint64, marshaledBlock []byte) *gossip_proto.Payload {
return &gossip_proto.Payload{
Data: marshaledBlock,
SeqNum: seqNum,
}
}