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gossip_discovery_service.go
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gossip_discovery_service.go
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package discovery
import (
"context"
"fmt"
"github.com/hyperledger/fabric-protos-go/discovery"
discClient "github.com/hyperledger/fabric/discovery/client"
)
// gossipServiceDiscovery - fetches info about all available peers, endorsers and orderers for channel & chaincode
// via configured gossip protocol
// helper module for GossipDiscoveryProvider
type gossipServiceDiscovery struct {
client *discClient.Client
clientIdentity []byte
}
func newGossipServiceDiscovery(client *discClient.Client, clientIdentity []byte) *gossipServiceDiscovery {
return &gossipServiceDiscovery{
client: client,
clientIdentity: clientIdentity,
}
}
// DiscoverChaincode - find available peers, endorsers and orderers for channel & chaincode
func (s *gossipServiceDiscovery) DiscoverChaincode(ctx context.Context, ccName, chanName string) (*chaincodeDTO, error) {
// TODO err handling/diversification
req, err := discClient.
NewRequest().
OfChannel(chanName).
AddPeersQuery().
AddConfigQuery().
AddEndorsersQuery(&discovery.ChaincodeInterest{
Chaincodes: []*discovery.ChaincodeCall{
{Name: ccName},
},
})
if err != nil {
return nil, err
}
res, err := s.client.Send(ctx, req, s.getAuthInfo())
if err != nil {
return nil, err
}
chanEndorsers, err := res.ForChannel(chanName).Endorsers(discClient.InvocationChain{
&discovery.ChaincodeCall{
Name: ccName,
},
}, discClient.NoFilter)
if err != nil {
return nil, err
}
chanPeers, err := res.ForChannel(chanName).Peers()
if err != nil {
return nil, err
}
chanCfg, err := res.ForChannel(chanName).Config()
if err != nil {
return nil, err
}
// get chaincode version
var ccVersion string
if len(chanEndorsers) != 0 {
ccCodes := chanEndorsers[0].StateInfoMessage.GossipMessage.GetStateInfo().Properties.Chaincodes
if len(ccCodes) != 0 {
ccVersion = ccCodes[0].Version
}
}
dc := newChaincodeDTO(ccName, ccVersion, chanName)
return s.parseDiscoverChaincodeResponse(dc, chanEndorsers, chanPeers, chanCfg), nil
}
// DiscoverChannel - returns orderers for provided channel
func (s *gossipServiceDiscovery) DiscoverChannel(ctx context.Context, chanName string) (*channelDTO, error) {
req := discClient.
NewRequest().
OfChannel(chanName).
AddConfigQuery()
res, err := s.client.Send(ctx, req, s.getAuthInfo())
if err != nil {
return nil, err
}
chanCfg, err := res.ForChannel(chanName).Config()
if err != nil {
return nil, err
}
dc := newChannelDTO(chanName)
return s.parseDiscoverChannelResponse(dc, chanCfg), nil
}
// LocalDiscovery - returns local peers. Useful for peer pool initialization
func (s *gossipServiceDiscovery) LocalDiscovery(ctx context.Context) (*localPeersDTO, error) {
req := discClient.
NewRequest().AddLocalPeersQuery()
res, err := s.client.Send(ctx, req, s.getAuthInfo())
if err != nil {
return nil, err
}
peers, err := res.ForLocal().Peers()
if err != nil {
return nil, err
}
dc := newLocalPeersDTO()
return s.parseDiscoverLocalPeers(dc, peers), nil
}
func (s *gossipServiceDiscovery) parseDiscoverChaincodeResponse(
dc *chaincodeDTO,
endorsers discClient.Endorsers,
peers []*discClient.Peer,
cfg *discovery.ConfigResult,
) *chaincodeDTO {
for i := range endorsers {
hostAddr := endorsers[i].AliveMessage.GetAliveMsg().Membership.Endpoint
dc.addEndpointToEndorsers(endorsers[i].MSPID, hostAddr)
}
for i := range peers {
hostAddr := peers[i].AliveMessage.GetAliveMsg().Membership.Endpoint
dc.addEndpointToPeers(peers[i].MSPID, hostAddr)
}
for ordererMSPID := range cfg.Orderers {
for i := range cfg.Orderers[ordererMSPID].Endpoint {
hostAddr := fmt.Sprintf("%s:%d", cfg.Orderers[ordererMSPID].Endpoint[i].Host, cfg.Orderers[ordererMSPID].Endpoint[i].Port)
dc.addEndpointToOrderers(ordererMSPID, hostAddr)
}
}
return dc
}
func (s *gossipServiceDiscovery) parseDiscoverLocalPeers(
dc *localPeersDTO,
peers []*discClient.Peer,
) *localPeersDTO {
for i := range peers {
hostAddr := peers[i].AliveMessage.GetAliveMsg().Membership.Endpoint
dc.addEndpointToPeers(peers[i].MSPID, hostAddr)
}
return dc
}
func (s *gossipServiceDiscovery) parseDiscoverChannelResponse(
dc *channelDTO,
cfg *discovery.ConfigResult,
) *channelDTO {
for ordererMSPID := range cfg.Orderers {
for i := range cfg.Orderers[ordererMSPID].Endpoint {
hostAddr := fmt.Sprintf("%s:%d", cfg.Orderers[ordererMSPID].Endpoint[i].Host, cfg.Orderers[ordererMSPID].Endpoint[i].Port)
dc.addEndpointToOrderers(ordererMSPID, hostAddr)
}
}
return dc
}
func (s *gossipServiceDiscovery) getAuthInfo() *discovery.AuthInfo {
return &discovery.AuthInfo{
ClientIdentity: s.clientIdentity,
}
}