/
fetch.go
120 lines (103 loc) · 2.79 KB
/
fetch.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
/*
版权所有IBM公司。保留所有权利。
SPDX许可证标识符:Apache-2.0
**/
package channel
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/peer/common"
cb "github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric/protos/utils"
"github.com/spf13/cobra"
)
func fetchCmd(cf *ChannelCmdFactory) *cobra.Command {
fetchCmd := &cobra.Command{
Use: "fetch <newest|oldest|config|(number)> [outputfile]",
Short: "Fetch a block",
Long: "Fetch a specified block, writing it to a file.",
RunE: func(cmd *cobra.Command, args []string) error {
return fetch(cmd, args, cf)
},
}
flagList := []string{
"channelID",
}
attachFlags(fetchCmd, flagList)
return fetchCmd
}
func fetch(cmd *cobra.Command, args []string, cf *ChannelCmdFactory) error {
if len(args) == 0 {
return fmt.Errorf("fetch target required, oldest, newest, config, or a number")
}
if len(args) > 2 {
return fmt.Errorf("trailing args detected")
}
//对命令行的分析已完成,因此沉默命令用法
cmd.SilenceUsage = true
//默认为从订购方获取
ordererRequired := OrdererRequired
peerDeliverRequired := PeerDeliverNotRequired
if len(strings.Split(common.OrderingEndpoint, ":")) != 2 {
//如果没有提供订购方终结点,请连接到对等方的交货服务
ordererRequired = OrdererNotRequired
peerDeliverRequired = PeerDeliverRequired
}
var err error
if cf == nil {
cf, err = InitCmdFactory(EndorserNotRequired, peerDeliverRequired, ordererRequired)
if err != nil {
return err
}
}
var block *cb.Block
switch args[0] {
case "oldest":
block, err = cf.DeliverClient.GetOldestBlock()
case "newest":
block, err = cf.DeliverClient.GetNewestBlock()
case "config":
iBlock, err2 := cf.DeliverClient.GetNewestBlock()
if err2 != nil {
return err2
}
lc, err2 := utils.GetLastConfigIndexFromBlock(iBlock)
if err2 != nil {
return err2
}
block, err = cf.DeliverClient.GetSpecifiedBlock(lc)
default:
num, err2 := strconv.Atoi(args[0])
if err2 != nil {
return fmt.Errorf("fetch target illegal: %s", args[0])
}
block, err = cf.DeliverClient.GetSpecifiedBlock(uint64(num))
}
if err != nil {
return err
}
b, err := proto.Marshal(block)
if err != nil {
return err
}
var file string
if len(args) == 1 {
file = channelID + "_" + args[0] + ".block"
} else {
file = args[1]
}
if err = ioutil.WriteFile(file, b, 0644); err != nil {
return err
}
return nil
}