README.md

BlockReader

BlockReader application extract and showcase the complete data structure of a Block that contains several details for a transaction. The application will require a transaction id to query the ledger to retrieve the associated block. Then the application will follow the Block data structure to read the content of the Block.

Medium writeup : https://medium.com/@deeptiman/whats-inside-the-block-in-hyperledger-fabric-69a0934fef08

Run the application

1. Compile the application using following commands

   cd /go/src/github.com/blockreader
   go build            
   

   You can see blockreader executable is generated.

2. Now type following commands to read the Block.

    ./blockreader -txnId="cd2b072c880cdefbea66c5f9d73a5a5eb3c3977e77772fba42cec59204ca2980" -channelId="employeeledger"            
    -txnId : The transaction id to be query to retrieve the Block for that transaction from the ledger.
    -channelId: The network ChannelId
   

3. After that, you will see the Block details in a JSON format.

   ************* BLOCK READER JSON ************* 
   {
       "BlockHeader": {
           "number": 2,
           "previous_hash": "2e8ddbf2dfd6b90fdadd0f2653f932f9f8bb7922244f991b66fc9ebeff3c63c1",
           "data_hash": "6df36db3c31ac485754d7e840574bf53639539d9b810c433cec143fe234557e8"
       },
       "BlockData": {
           "envelope": {
               "header": {
                   "payload": {
                       "channel_header": {
                           "type": "ENDORSER_TRANSACTION",
                           "version": 0,
                           "channelid": "employeeledger",
                           "txid": "c3d95a4e5606cae3a1aabced9fe532f7f628b2930eb09452f2b0db62f6e6ee0b",
                           "epoch": 0,
                           "extension": {
                               "chaincode_id": {
                                   "path": "",
                                   "name": "employeeledger",
                                   "version": ""
                               }
                           }
                       },
                       "signature_header": {
                           "creator": {
                               "msp_id": "org1.employee.ledger.com",
                               "cert_hash": "-----BEGIN CERTIFICATE-----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\n-----END CERTIFICATE-----\n",
                               "certificate": {
                                   "country": [
                                       "US"
                                   ],
                                   "organization": [
                                       "org1.employee.ledger.com"
                                   ],
                                   "organization_unit": null,
                                   "locality": [
                                       "San Francisco"
                                   ],
                                   "province": [
                                       "California"
                                   ],
                                   "serial_number": "",
                                   "not_before": "2020-01-19T20:17:00Z",
                                   "not_after": "2021-01-18T20:22:00Z"
                               }
                           }
                       }
                   }
               },
               "data": {
                   "transaction": {
                       "chaincode_proposal_payload": {
                           "chaincode_invocation_spec": {
                               "chaincode_spec": {
                                   "chaincode_id": "employeeledger",
                                   "chaincode_type": "GOLANG",
                                   "chaincode_args": [
                                       "invoke",
                                       "createUser",
                                       "Deeptiman Pattnaik",
                                       "[email protected]",
                                       "Personal",
                                       "Software",
                                       "90,000",
                                       "Admin"
                                   ]
                               }
                           }
                       },
                       "chaincode_endorsed_action": {
                           "proposal_response_payload": {
                               "proposal_hash": "0597a5c323fa68d26e3063ccf640f8658c19f80454b573866cf0614fc2d57f11",
                               "chaincode_kv_rw_set": {
                                   "reads": {
                                       "Key": "employeeledger",
                                       "version": {
                                           "block_num": 1,
                                           "txnum": 0
                                       }
                                   },
                                   "range_queries_info": {
                                       "startkey": "",
                                       "endkey": "",
                                       "itr_exhausted": false
                                   },
                                   "writes": {
                                       "key": "",
                                       "is_delete": false
                                   },
                                   "metadata_writes": {
                                       "key": "",
                                       "name": ""
                                   }
                               },
                               "chaincode_events": {
                                   "chaincode_id": "employeeledger",
                                   "txid": "c3d95a4e5606cae3a1aabced9fe532f7f628b2930eb09452f2b0db62f6e6ee0b",
                                   "event_name": "addUserInvoke",
                                   "payload": ""
                               }
                           }
                       }
                   }
               }
           }
       },
       "BlockMetaData": {
           "value": null,
           "signature": "MEQCICshHeJiB1d1SdBmOyVaQLBrgmAOsrxwEEUO3ZkbB/gDAiAuGcyGDC/i8ExrfZg0p5zzSP/HnBODqSOe5kucVA0ZQg==",
           "signature_header": {
               "creator": {
                   "msp_id": "employee.ledger.com",
                   "cert_hash": "-----BEGIN CERTIFICATE-----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\n7PYTnIUfx6l7ruLU+LuJywzxkKD0AScR\n-----END CERTIFICATE-----\n",
                   "certificate": {
                       "country": [
                           "US"
                       ],
                       "organization": [
                           "employee.ledger.com"
                       ],
                       "organization_unit": null,
                       "locality": [
                           "San Francisco"
                       ],
                       "province": [
                           "California"
                       ],
                       "serial_number": "",
                       "not_before": "2020-01-18T08:04:01Z",
                       "not_after": "2030-01-15T08:04:01Z"
                   }
               }
           }
       }
   }
   

License

This project is licensed under the MIT License