Hyperledger Fabric SDK 示例fabric-samples-《balance-transfer》之十二《查询已经加入的channel名称》

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转载请标明出处：
https://blog.csdn.net/qq_27818541/article/details/78599888
本文出自:【BigManing的博客】

前言

查询peer加入的channel名称。需要如下参数：

• peer节点

路由

app.js

//获取加入channel名称
app.get('/channels', function(req, res) {
    logger.debug('================ GET CHANNELS ======================');
    logger.debug('peer: ' + req.query.peer);
    var peer = req.query.peer;
    if (!peer) {
        res.json(getErrorMessage('\'peer\''));
        return;
    }

    query.getChannels(peer, req.username, req.orgname)
    .then(function(
        message) {
        res.send(message);
    });
});

具体实现

query.js

var getChannels = function(peer, username, org) {
    // peer地址
    var target = buildTarget(peer, org);
    // channel实例
    var channel = helper.getChannelForOrg(org);
    //client实例
    var client = helper.getClientForOrg(org);
    // 获取当前注册用户
    return helper.getRegisteredUsers(username, org).then((member) => {
        //通过client调用api
        return client.queryChannels(target);
    }, (err) => {
        logger.info('Failed to get submitter "' + username + '"');
        return 'Failed to get submitter "' + username + '". Error: ' + err.stack ?
            err.stack : err;
    }).then((response) => {
        //处理响应
        if (response) {
            logger.debug('<<< channels >>>');
            var channelNames = [];
            for (let i = 0; i < response.channels.length; i++) {
                channelNames.push('channel id: ' + response.channels[i].channel_id);
            }
            logger.debug(channelNames);
            return response;
        } 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 Channels"
echo
curl -s -X GET \
  "http://localhost:4000/channels?peer=peer1" \
  -H "authorization: Bearer $ORG1_TOKEN" \
  -H "content-type: application/json"
echo
echo

控制台打印：

GET query Channels

{"channels":[{"channel_id":"mychannel"}]}

后台打印：

[2017-10-16 11:07:43.315] [DEBUG] SampleWebApp - ================ GET CHANNELS ======================
[2017-10-16 11:07:43.316] [DEBUG] SampleWebApp - peer: peer1
[2017-10-16 11:07:43.316] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore.js - constructor
[2017-10-16 11:07:43.317] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- getValue
[2017-10-16 11:07:43.319] [DEBUG] Helper - [crypto_ecdsa_aes]: importKey - start
[2017-10-16 11:07:43.319] [DEBUG] Helper - [crypto_ecdsa_aes]: importKey - have the key [Circular]
[2017-10-16 11:07:43.320] [DEBUG] Helper - [utils.CryptoKeyStore]: _getKeyStore resolving store
[2017-10-16 11:07:43.320] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d
[2017-10-16 11:07:43.320] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349
[2017-10-16 11:07:43.322] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- setValue
[2017-10-16 11:07:43.323] [DEBUG] Helper - [utils.CryptoKeyStore]: _getKeyStore resolving store
[2017-10-16 11:07:43.324] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- getValue
[2017-10-16 11:07:43.325] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d
[2017-10-16 11:07:43.325] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349
[2017-10-16 11:07:43.325] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d
[2017-10-16 11:07:43.325] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349
[2017-10-16 11:07:43.325] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param X: b3e2a75b9a4fd2b081589b1c45bde49f583aea9d7d466798c7b765c4ca96973d
[2017-10-16 11:07:43.325] [DEBUG] Helper - [ecdsa/key.js]: ECDSA curve param Y: c58820e5a9db75ab17841ac158e9389ad0d130a6827dc0682dcb2d2c5dccb349
[2017-10-16 11:07:43.325] [DEBUG] Helper - [FileKeyValueStore.js]: FileKeyValueStore -- setValue
[2017-10-16 11:07:43.326] [INFO] Helper - Successfully loaded member from persistence
[2017-10-16 11:07:43.334] [DEBUG] Helper - [crypto_ecdsa_aes]: ecdsa signature:  Signature {
  r: <BN: e8f972a0b424c772ab360fdf4f0e3341a1d82398886cd7e93fcff87354f35f37>,
  s: <BN: 3ecb06de15192b6a0797e0719d2db80128b9bd1491d472b61ecb4fb3893c55c6>,
  recoveryParam: 0 }
[2017-10-16 11:07:43.346] [DEBUG] Query - <<< channels >>>
[2017-10-16 11:07:43.346] [DEBUG] Query - [ 'channel id: mychannel' ]