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client.go
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client.go
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// Copyright IBM Corp. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"flag"
"fmt"
"math"
"os"
cb "github.com/hyperledger/fabric-protos-go/common"
ab "github.com/hyperledger/fabric-protos-go/orderer"
"github.com/hyperledger/fabric/bccsp/factory"
"github.com/hyperledger/fabric/common/tools/protolator"
"github.com/hyperledger/fabric/internal/pkg/identity"
mspmgmt "github.com/hyperledger/fabric/msp/mgmt"
"github.com/hyperledger/fabric/orderer/common/localconfig"
"github.com/hyperledger/fabric/protoutil"
"google.golang.org/grpc"
)
var (
oldest = &ab.SeekPosition{Type: &ab.SeekPosition_Oldest{Oldest: &ab.SeekOldest{}}}
newest = &ab.SeekPosition{Type: &ab.SeekPosition_Newest{Newest: &ab.SeekNewest{}}}
maxStop = &ab.SeekPosition{Type: &ab.SeekPosition_Specified{Specified: &ab.SeekSpecified{Number: math.MaxUint64}}}
)
type deliverClient struct {
client ab.AtomicBroadcast_DeliverClient
channelID string
signer identity.SignerSerializer
quiet bool
}
func newDeliverClient(client ab.AtomicBroadcast_DeliverClient, channelID string, signer identity.SignerSerializer, quiet bool) *deliverClient {
return &deliverClient{client: client, channelID: channelID, signer: signer, quiet: quiet}
}
func (r *deliverClient) seekHelper(start *ab.SeekPosition, stop *ab.SeekPosition) *cb.Envelope {
env, err := protoutil.CreateSignedEnvelope(cb.HeaderType_DELIVER_SEEK_INFO, r.channelID, r.signer, &ab.SeekInfo{
Start: start,
Stop: stop,
Behavior: ab.SeekInfo_BLOCK_UNTIL_READY,
}, 0, 0)
if err != nil {
panic(err)
}
return env
}
func (r *deliverClient) seekOldest() error {
return r.client.Send(r.seekHelper(oldest, maxStop))
}
func (r *deliverClient) seekNewest() error {
return r.client.Send(r.seekHelper(newest, maxStop))
}
func (r *deliverClient) seekSingle(blockNumber uint64) error {
specific := &ab.SeekPosition{Type: &ab.SeekPosition_Specified{Specified: &ab.SeekSpecified{Number: blockNumber}}}
return r.client.Send(r.seekHelper(specific, specific))
}
func (r *deliverClient) readUntilClose() {
for {
msg, err := r.client.Recv()
if err != nil {
fmt.Println("Error receiving:", err)
return
}
switch t := msg.Type.(type) {
case *ab.DeliverResponse_Status:
fmt.Println("Got status ", t)
return
case *ab.DeliverResponse_Block:
if !r.quiet {
fmt.Println("Received block: ")
err := protolator.DeepMarshalJSON(os.Stdout, t.Block)
if err != nil {
fmt.Printf(" Error pretty printing block: %s", err)
}
} else {
fmt.Println("Received block: ", t.Block.Header.Number)
}
}
}
}
func main() {
conf, err := localconfig.Load()
if err != nil {
fmt.Println("failed to load config:", err)
os.Exit(1)
}
// Load local MSP
err = mspmgmt.LoadLocalMsp(conf.General.LocalMSPDir, conf.General.BCCSP, conf.General.LocalMSPID)
if err != nil { // Handle errors reading the config file
fmt.Println("Failed to initialize local MSP:", err)
os.Exit(0)
}
signer, err := mspmgmt.GetLocalMSP(factory.GetDefault()).GetDefaultSigningIdentity()
if err != nil {
fmt.Println("Failed to load local signing identity:", err)
os.Exit(0)
}
var channelID string
var serverAddr string
var seek int
var quiet bool
flag.StringVar(&serverAddr, "server", fmt.Sprintf("%s:%d", conf.General.ListenAddress, conf.General.ListenPort), "The RPC server to connect to.")
flag.StringVar(&channelID, "channelID", "mychannel", "The channel ID to deliver from.")
flag.BoolVar(&quiet, "quiet", false, "Only print the block number, will not attempt to print its block contents.")
flag.IntVar(&seek, "seek", -2, "Specify the range of requested blocks."+
"Acceptable values:"+
"-2 (or -1) to start from oldest (or newest) and keep at it indefinitely."+
"N >= 0 to fetch block N only.")
flag.Parse()
if seek < -2 {
fmt.Println("Wrong seek value.")
flag.PrintDefaults()
}
conn, err := grpc.Dial(serverAddr, grpc.WithInsecure())
if err != nil {
fmt.Println("Error connecting:", err)
return
}
client, err := ab.NewAtomicBroadcastClient(conn).Deliver(context.TODO())
if err != nil {
fmt.Println("Error connecting:", err)
return
}
s := newDeliverClient(client, channelID, signer, quiet)
switch seek {
case -2:
err = s.seekOldest()
case -1:
err = s.seekNewest()
default:
err = s.seekSingle(uint64(seek))
}
if err != nil {
fmt.Println("Received error:", err)
}
s.readUntilClose()
}