Hyperledger Fabric SDK 示例fabric-samples-《balance-transfer》之十《查询链信息》

前言

查询链信息。需要如下参数：

• peer节点
• channel

channel是fabric重要的特性，一个peer加入了几个channel中，那么peer节点就维护几个链的信息。不属于这个channel的peer获取不到该channel内的链信息。这个类似于qq群。
这个示例是展示的mychannel的链信息。

路由

app.js

//查询链信息  Query for Channel Informationapp.get('/channels/:channelName', function(req, res) {    logger.debug(        '================ GET CHANNEL INFORMATION ======================');    logger.debug('channelName : ' + req.params.channelName);    let peer = req.query.peer;    query.getChainInfo(peer, req.username, req.orgname).then(        function(message) {            res.send(message);        });});

具体实现

query.js

var getChainInfo = function(peer, username, org) {    //  peer节点地址    var target = buildTarget(peer, org);    // 获取channel    var channel = helper.getChannelForOrg(org);    //获取注册用户    return helper.getRegisteredUsers(username, org).then((member) => {        //查询链详情        return channel.queryInfo(target);    }, (err) => {        logger.info('Failed to get submitter "' + username + '"');        return 'Failed to get submitter "' + username + '". Error: ' + err.stack ?            err.stack : err;    }).then((blockchainInfo) => {        // 打印信息        if (blockchainInfo) {                       logger.debug('===========================================');            logger.debug(blockchainInfo.currentBlockHash);            logger.debug('===========================================');            //logger.debug(blockchainInfo);            return blockchainInfo;        } else {            logger.error('response_payloads is null');            return 'response_payloads is null';        }    }, (err) => {        logger.error('Failed to send query due to error: ' + err.stack ? err.stack :            err);        return 'Failed to send query due to error: ' + err.stack ? err.stack : err;    }).catch((err) => {        logger.error('Failed to query with error:' + err.stack ? err.stack : err);        return 'Failed to query with error:' + err.stack ? err.stack : err;    });};

基本流程

API访问

echo "GET query ChainInfo"echocurl -s -X GET \  "http://localhost:4000/channels/mychannel?peer=peer1" \  -H "authorization: Bearer $ORG1_TOKEN" \  -H "content-type: application/json"echoecho

控制台打印：

GET query ChainInfo{"height":{"low":3,"high":0,"unsigned":true},"currentBlockHash":{"buffer":{"type":"Buffer","data":[8,3,18,32,163,148,207,219,172,100,216,50,0,14,18,240,253,118,10,33,155,0,195,60,214,175,29,159,16,220,140,111,52,191,57,88,26,32,58,119,237,8,196,95,11,249,0,137,153,78,78,255,51,23,180,39,52,42,188,123,150,38,169,155,111,170,90,53,202,228]},"offset":4,"markedOffset":-1,"limit":36,"littleEndian":true,"noAssert":false},"previousBlockHash":{"buffer":{"type":"Buffer","data":[8,3,18,32,163,148,207,219,172,100,216,50,0,14,18,240,253,118,10,33,155,0,195,60,214,175,29,159,16,220,140,111,52,191,57,88,26,32,58,119,237,8,196,95,11,249,0,137,153,78,78,255,51,23,180,39,52,42,188,123,150,38,169,155,111,170,90,53,202,228]},"offset":38,"markedOffset":-1,"limit":70,"littleEndian":true,"noAssert":false}}

后台打印：

[2017-10-16 11:07:43.140] [DEBUG] SampleWebApp - Decoded from JWT token: username - Jim, orgname - org1[2017-10-16 11:07:43.140] [DEBUG] SampleWebApp - ================ GET TRANSACTION BY TRANSACTION_ID ======================[2017-10-16 11:07:43.141] [DEBUG] SampleWebApp - channelName : mychannel[2017-10-16 11:07:43.142] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore.js - constructor[2017-10-16 11:07:43.144] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- getValue[2017-10-16 11:07:43.145] [DEBUG] Helper - [crypto_ecdsa_aes]: importKey - start[2017-10-16 11:07:43.146] [DEBUG] Helper - [crypto_ecdsa_aes]: importKey - have the key [Circular][2017-10-16 11:07:43.146] [DEBUG] Helper - [utils.CryptoKeyStore]: _getKeyStore resolving store[2017-10-16 11:07:43.146] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.146] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.146] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- setValue[2017-10-16 11:07:43.147] [DEBUG] Helper - [utils.CryptoKeyStore]: _getKeyStore resolving store[2017-10-16 11:07:43.147] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- getValue[2017-10-16 11:07:43.147] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.147] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.148] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.148] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.148] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.148] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.148] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- setValue[2017-10-16 11:07:43.148] [INFO] Helper - Successfully loaded member from persistence[2017-10-16 11:07:43.155] [DEBUG] Helper - [crypto_ecdsa_aes]: ecdsa signature:  Signature {  r: <BN: 6d0ae79a06d8b5d9d593d8a22f9667e41ef41d7005f635e071d61730e4519868>,  s: <BN: 2aa650cffd0dcf227f76add8a490a94eae4717a572576e2f56105d58cb21d292>,  recoveryParam: 1 }[2017-10-16 11:07:43.167] [DEBUG] Query - { validationCode: 0,  transactionEnvelope:    { signature: <Buffer 30 45 02 21 00 b1 1a 25 98 70 e0 bb f0 72 58 4f 35 3a b1 51 5f 47 59 c8 54 eb 47 5b ed cc ba 38 b5 c3 62 a4 d7 02 20 66 79 6e 05 ea e9 01 5e 63 ee a2 ... >,     payload: { header: [Object], data: [Object] } } }[2017-10-16 11:07:43.180] [DEBUG] SampleWebApp - Decoded from JWT token: username - Jim, orgname - org1[2017-10-16 11:07:43.180] [DEBUG] SampleWebApp - ================ GET CHANNEL INFORMATION ======================[2017-10-16 11:07:43.180] [DEBUG] SampleWebApp - channelName : mychannel[2017-10-16 11:07:43.181] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore.js - constructor[2017-10-16 11:07:43.182] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- getValue[2017-10-16 11:07:43.184] [DEBUG] Helper - [crypto_ecdsa_aes]: importKey - start[2017-10-16 11:07:43.185] [DEBUG] Helper - [crypto_ecdsa_aes]: importKey - have the key [Circular][2017-10-16 11:07:43.185] [DEBUG] Helper - [utils.CryptoKeyStore]: _getKeyStore resolving store[2017-10-16 11:07:43.186] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.186] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.186] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- setValue[2017-10-16 11:07:43.187] [DEBUG] Helper - [utils.CryptoKeyStore]: _getKeyStore resolving store[2017-10-16 11:07:43.187] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- getValue[2017-10-16 11:07:43.189] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.189] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.190] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.190] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.190] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d[2017-10-16 11:07:43.191] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349[2017-10-16 11:07:43.191] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- setValue[2017-10-16 11:07:43.192] [INFO] Helper - Successfully loaded member from persistence[2017-10-16 11:07:43.197] [DEBUG] Helper - [crypto_ecdsa_aes]: ecdsa signature:  Signature {  r: <BN: 54b9f607de6ce70a481f5addc019254444542641dba18c69eedb4f8e95753b26>,  s: <BN: 58c66685d958ccb6c99cf1556efc24353e1c8545a4b6ac2f8aa0fa1e75dca7af>,  recoveryParam: 0 }[2017-10-16 11:07:43.207] [DEBUG] Query - ===========================================[2017-10-16 11:07:43.207] [DEBUG] Query - ByteBuffer {  buffer: <Buffer 08 03 12 20 a3 94 cf db ac 64 d8 32 00 0e 12 f0 fd 76 0a 21 9b 00 c3 3c d6 af 1d 9f 10 dc 8c 6f 34 bf 39 58 1a 20 3a 77 ed 08 c4 5f 0b f9 00 89 99 4e ... >,  offset: 4,  markedOffset: -1,  limit: 36,  littleEndian: true,  noAssert: false }