首页 / 操作系统 / Linux / Hyperledger区块数据的访问

简介

本文介绍了访问Hyperledger区块数据的几种方法.

REST API

Hyperledger提供了多个REST API （https://hyperledger-fabric.readthedocs.io/en/latest/API/CoreAPI/#rest-api） 用于访问Hyperledger区块数据.

示例1： 获取区块链长度

请求http://192.168.99.100:7050/chain/响应{"height": 5,"currentBlockHash": "9UIs99F9Qq0RvwOzCEDG0SHvBrdoOHy0rexOICJ56aiIQbnszEO9y2QpjbMnrzIp3ehGh6W8FWY8eqbBFqaOVA==","previousBlockHash": "AABHooEnVMuv4JO4roHqgcNAOf3mcUqOV6sTrCWeuPcKf/ji4tYXJ5cONgcQTwoIowf1wAqhZObFmjkT1QLmsQ=="}

示例2： 获取区块数据

请求http://192.168.99.100:7050/chain/blocks/4响应{"transactions": [{"type": 2,"chaincodeID": "EgRteWNj","payload": "CigIARIGEgRteWNjGhwKBmludm9rZQoHdGVzdEtleQoJdGVzdFZhbHVl","txid": "4a05fbd2-f17d-46eb-abec-a6218b404117","timestamp": {"seconds": 1476704491,"nanos": 740300402},"nonce": "jYFNo67ks3JhWh3PwxCJG0qK0rnBojwe","cert": "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","signature": "MEUCIHRnWCQmt+4QoiY01aiDU+0567xUgaiEZ6zZr+gDg8D2AiEA+OgCGGxWbQTkmC0IB4nJoiU65Dv/pR27XDirhtXgStU="}],"stateHash": "cxUZAjaQar85ZGvgt4z3soRMpQjJpDrpLBkFbwqQSVb1rebXcMT1kMzNA45MX9ybB/sILXCslN1C9yprmhAVng==","previousBlockHash": "9UIs99F9Qq0RvwOzCEDG0SHvBrdoOHy0rexOICJ56aiIQbnszEO9y2QpjbMnrzIp3ehGh6W8FWY8eqbBFqaOVA==","nonHashData": {"localLedgerCommitTimestamp": {"seconds": 1476704492,"nanos": 779081508},"chaincodeEvents": [{}]}}

Java Client API

Hyperledger Java Client API （https://github.com/hyperledger/fabric-api）提供较为底层的接口来访问Hyperledger区块数据. 以下示例代码显示如何解析Invocation类的区块中的payload.privatevoiddecodeChaincodeInvocationSpec（） {try {String base64String = "CigIARIGEgRteWNjGhwKBmludm9rZQoHdGVzdEtleQoJdGVzdFZhbHVl";byte[] decoded = javax.xml.bind.DatatypeConverter.parseBase64Binary（base64String）;Chaincode.ChaincodeInvocationSpec invocationSpec =Chaincode.ChaincodeInvocationSpec.parseFrom（decoded）;Map<Descriptors.FieldDescriptor, Object> fields = invocationSpec.getAllFields（）;for （Descriptors.FieldDescriptor key : fields.keySet（）） {Chaincode.ChaincodeSpec value = （Chaincode.ChaincodeSpec） fields.get（key）;System.out.println（"key:" + key）;System.out.println（"value:" + value）;}} catch （Exception ex） {ex.printStackTrace（）;}}相应的输出为：key:protos.ChaincodeInvocationSpec.chaincodeSpecvalue:type: GOLANGchaincodeID {name: "mycc"}ctorMsg {args: "invoke"args: "testKey"args: "testValue"}

总结

本文介绍了使用Hyperledger REST和Java Client API访问Hyperledger区块数据的方法.本文永久更新链接地址：http://www.linuxidc.com/Linux/2016-10/136580.htm