Hyperledger fabric 使用 configtxlator 工具解析區塊

解析區塊可以分爲2步進行：

• 把區塊從賬本里取出來，區塊格式爲 protobuf
• 把 protobuf 格式的區塊轉換爲 JSON 格式

一、獲取區塊

1.進入 peer0.org1.example.com 的容器中

[jack@localhost blockchain_Server]$ docker exec -it peer0.org1.example.com bash

 結果

root@a01d1f70bc8c:/opt/gopath/src/github.com/hyperledger/fabric/peer#

注意：以上的 a01d1f70bc8c 是 peer0.org1.example.com 這個容器的 id，後面拷貝區塊文件的時候會用到

2.peer channel fetch 命令

peer channel fetch 命令能夠拉取指定通道最新、最老以及特定高度的區塊，不過得到的區塊是protobuf格式的，不轉換無法知道內容，具體的命令參數說明如下：

root@a01d1f70bc8c:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer channel fetch -h
Fetch a specified block, writing it to a file.

Usage:
  peer channel fetch <newest|oldest|config|(number)> [outputfile] [flags]

Flags:
      --bestEffort         Whether fetch requests should ignore errors and return blocks on a best effort basis
  -c, --channelID string   In case of a newChain command, the channel ID to create. It must be all lower case, less than 250 characters long and match the regular expression: [a-z][a-z0-9.-]*
  -h, --help               help for fetch

Global Flags:
      --cafile string                       Path to file containing PEM-encoded trusted certificate(s) for the ordering endpoint
      --certfile string                     Path to file containing PEM-encoded X509 public key to use for mutual TLS communication with the orderer endpoint
      --clientauth                          Use mutual TLS when communicating with the orderer endpoint
      --connTimeout duration                Timeout for client to connect (default 3s)
      --keyfile string                      Path to file containing PEM-encoded private key to use for mutual TLS communication with the orderer endpoint
  -o, --orderer string                      Ordering service endpoint
      --ordererTLSHostnameOverride string   The hostname override to use when validating the TLS connection to the orderer.
      --tls                                 Use TLS when communicating with the orderer endpoint

3.拉取區塊

root@a01d1f70bc8c:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer channel fetch 2 mychannel.block  -c mychannel
2019-11-29 07:24:35.154 UTC [channelCmd] InitCmdFactory -> INFO 001 Endorser and orderer connections initialized
2019-11-29 07:24:35.156 UTC [cli.common] readBlock -> INFO 002 Received block: 2

4.ls一下

root@a01d1f70bc8c:/opt/gopath/src/github.com/hyperledger/fabric/peer# ls
mychannel.block

二、將區塊文件拷貝到本機

命令構成：docker cp <容器id>:<容器中區塊文件存放的路徑> <本機路徑>

[jack@localhost ~]$ docker cp a01d1f70bc8c:/opt/gopath/src/github.com/hyperledger/fabric/peer/mychannel.block /home/workspace/go/src/github.com/hyperledger/fabric/scripts/fabric-samples/bin

注意：<本機路徑> 與 configtxlator 工具所在的路徑最好一致，這樣比較方便，我的fabric版本是1.4.3，configtxlator 工具路徑如下

/home/workspace/go/src/github.com/hyperledger/fabric/scripts/fabric-samples/bin

三、使用 configtxlator 工具解析區塊

1.進入 configtxlator 工具所在路徑

[jack@localhost ~]$ cd workspace/go/src/github.com/hyperledger/fabric/scripts/fabric-samples/bin
[jack@localhost bin]$

2.使用 configtxlator 工具把區塊從 protobuf 格式解析成 JSON 格式

[jack@localhost bin]$ configtxlator proto_decode  --type common.Block --input mychannel.block > mychannel.block.json

3.成功後cat 一下

[jack@localhost bin]$ cat mychannel.block.json

 以下是部分截圖