fabric监听落块事件
fabric 版本 v2.2
可以得到,区块编号,当前哈希,前块哈希
go.mod
require (
github.com/hyperledger/fabric-gateway v1.1.0
github.com/hyperledger/fabric-protos-go-apiv2 v0.0.0-20220615102044-467be1c7b2e7
google.golang.org/grpc v1.47.0
)
/*
Copyright 2021 IBM All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package main
import (
"context"
"crypto/x509"
"fmt"
"io/ioutil"
"log"
"time"
"github.com/hyperledger/fabric-gateway/pkg/client"
"github.com/hyperledger/fabric-gateway/pkg/identity"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
mspID = "Org1MSP"
cryptoPath = "../bcb-cc-mon/config/ysjg1-p0-u152302"
certPath = cryptoPath + "/cert.pem"
keyPath = cryptoPath + "/priv_sk"
tlsCertPath = cryptoPath + "/ca.crt"
peerEndpoint = "peer0.org1.example.com:7051"
gatewayPeer = "peer0.org1.example.com"
channelName = "chl-02"
)
func main() {
log.Println("============ application-golang starts ============")
// The gRPC client connection should be shared by all Gateway connections to this endpoint
clientConnection := newGrpcConnection()
defer clientConnection.Close()
id := newIdentity()
sign := newSign()
// Create a Gateway connection for a specific client identity
gateway, err := client.Connect(
id,quire (
github.com/hyperledger/fabric-gateway v1.1.0
github.com/hyperledger/fabric-protos-go-apiv2 v0.0.0-20220615102044-467be1c7b2e7
google.golang.org/grpc v1.47.0
)
client.WithSign(sign),
client.WithClientConnection(clientConnection),
// Default timeouts for different gRPC calls
client.WithEvaluateTimeout(5*time.Second),
client.WithEndorseTimeout(15*time.Second),
client.WithSubmitTimeout(5*time.Second),
client.WithCommitStatusTimeout(1*time.Minute),
)
if err != nil {
panic(err)
}
defer gateway.Close()
network := gateway.GetNetwork(channelName)
ctx, cannel := context.WithCancel(context.Background())
defer cannel()
events, err := network.BlockEvents(ctx, client.WithStartBlock(10))
if err != nil {
panic(err)
}
for event := range events {
fmt.Printf("---> 区块编号: %v\n", event.GetHeader().GetNumber())
}
}
// newGrpcConnection creates a gRPC connection to the Gateway server.
func newGrpcConnection() *grpc.ClientConn {
certificate, err := loadCertificate(tlsCertPath)
if err != nil {
panic(err)
}
certPool := x509.NewCertPool()
certPool.AddCert(certificate)
transportCredentials := credentials.NewClientTLSFromCert(certPool, gatewayPeer)
connection, err := grpc.Dial(peerEndpoint, grpc.WithTransportCredentials(transportCredentials))
if err != nil {
panic(fmt.Errorf("failed to create gRPC connection: %w", err))
}
return connection
}
// newIdentity creates a client identity for this Gateway connection using an X.509 certificate.
func newIdentity() *identity.X509Identity {
certificate, err := loadCertificate(certPath)
if err != nil {
panic(err)
}
id, err := identity.NewX509Identity(mspID, certificate)
if err != nil {
panic(err)
}
return id
}
func loadCertificate(filename string) (*x509.Certificate, error) {
certificatePEM, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("failed to read certificate file: %w", err)
}
return identity.CertificateFromPEM(certificatePEM)
}
// newSign creates a function that generates a digital signature from a message digest using a private key.
func newSign() identity.Sign {quire (
github.com/hyperledger/fabric-gateway v1.1.0
github.com/hyperledger/fabric-protos-go-apiv2 v0.0.0-20220615102044-467be1c7b2e7
google.golang.org/grpc v1.47.0
)
//files, err := ioutil.ReadDir(keyPath)
//if err != nil {
//panic(fmt.Errorf("failed to read private key directory: %w", err))
//}
//privateKeyPEM, err := ioutil.ReadFile(path.Join(keyPath, files[0].Name()))
privateKeyPEM, err := ioutil.ReadFile(keyPath)
if err != nil {
panic(fmt.Errorf("failed to read private key file: %w", err))
}
privateKey, err := identity.PrivateKeyFromPEM(privateKeyPEM)
if err != nil {
panic(err)
}
sign, err := identity.NewPrivateKeySign(privateKey)
if err != nil {
panic(err)
}
return sign
}