为了我的开发/测试目的，我已经配置了一个单独的交易（使用在线游乐场）来为已定义的参与者上传几个主记录。接下来我想建立一个功能来证明这些记录实际上可以从遗留应用程序中提取并导入到资产/参与者注册表中。
我已经使用在线提供的转换器之一将提取的（.csv格式）数据文件转换为.json格式文件。
我被告知可以利用REST API来构建此代码。有人可以指导我查看相关文档，读取几百条（JSON格式）记录的代码片段并将它们发布到参与者/资产注册表吗？
谢谢！
答案 0 :(得分：1)
当然，事实上，我刚刚为我编写的区块链教程做了这个。入站数据的结构可识别参与者和资产。在我的示例中，有5种类型的参与者和1种类型的资产。该代码将处理多种类型的资产。入站文件是使用JSON表示法的文本文件：
{ "members":
[
{"type": "Seller", "pw": "bob", "companyName": "PC Hardware, Inc", "id": "bob@pchardwareinc.com"},
{"type": "Seller", "pw": "jojo", "companyName": "Inovative Solutions, Inc", "id": "jojo@innovativesolutionsinc.com"},
{"type": "Seller", "pw": "mary", "companyName": "The i-Series Experts, Inc", "id": "mary@iseriesexpertsinc.com"},
{"type": "Seller", "pw": "wilber", "companyName": "Cooling Systems R Us, Inc", "id": "wilber@coolingsystemsrusinc.com"},
{"type": "Seller", "pw": "erin", "companyName": "2nd Life Systems, Inc", "id": "Erin@2ndlifesystemsinc.com"},
{"type": "Seller", "pw": "abdul", "companyName": "The Cognitive Advantage, Inc", "id": "abdul@cognitiveadvantageinc.com"},
{"type": "Seller", "pw": "aiesha", "companyName": "Cloud Nine Software, Inc", "id": "aiesha@cloudninesoftwareinc.com"},
{"type": "Seller", "pw": "joshua", "companyName": "Office Experts, Inc", "id": "joshua@officeexpertsinc.com"},
{"type": "Seller", "pw": "alwayson", "companyName": "NonStop, Inc", "id": "alwayson@nonstopinc.com"},
{"type": "Seller", "pw": "anytime", "companyName": "Virtual Paper, Inc", "id": "anytime@virtualpaperinc.com"},
{"type": "Buyer", "pw": "yes", "companyName": "Software Solutions, Inc", "id": "yes@softwaresolutionsinc.com"},
{"type": "Buyer", "pw": "buyer1", "companyName": "Hybrid Cloud Designs, Inc", "id": "buyer1@hybridclouddesignsinc.com"},
{"type": "Buyer", "pw": "eric", "companyName": "Born On The Cloud, Inc", "id": "eric@bornonthecloudinc.com"},
{"type": "Buyer", "pw": "abby", "companyName": "Kid Friendly Learning, Inc", "id": "abby@kidfriendlyinc.com"},
{"type": "Buyer", "pw": "kristen", "companyName": "The Education Game, Inc", "id": "kristen@gameify.com"},
{"type": "Shipper", "pw": "speedmatters", "companyName": "Fast Eddy, Inc", "id": "speedmatters@fasteddyinc.com"},
{"type": "Shipper", "pw": "wantitnow", "companyName": "The Overnight Experts, Inc", "id": "wantitnow@overnightexpressinc.com"},
{"type": "Provider", "pw": "info", "companyName": "PC Hardware Now, Inc", "id": "info@pchardwarenowinc.com"},
{"type": "Provider", "pw": "power", "companyName": "UPS Systems, Inc", "id": "power@upssystemsinc.com"},
{"type": "Provider", "pw": "online", "companyName": "The App Store, Inc", "id": "online@theappstoreinc.com"},
{"type": "FinanceCo", "pw": "easymoney", "companyName": "The Global Financier", "id": "easymoney@easymoneyinc.com"}
],
"items":
[
{"itemNo": 1, "itemDescription": "Macbook Pro 16Gb, 1Tb", "quantity": 2000, "unitPrice": 1285},
{"itemNo": 2, "itemDescription": "Macbook Pro 8Gb, .5Tb", "quantity": 2000, "unitPrice": 985},
{"itemNo": 3, "itemDescription": "Lenovo Thinkpad W520 16Gb, .25Tb", "quantity": 1000, "unitPrice": 500},
{"itemNo": 4, "itemDescription": "Lenovo Thinkpad W520 32Gb, 1Tb", "quantity": 4000, "unitPrice": 1565},
{"itemNo": 5, "itemDescription": "4K Monitor - 25", "quantity": 4000, "unitPrice": 265},
{"itemNo": 6, "itemDescription": "4K Monitor - 32", "quantity": 4000, "unitPrice": 365},
{"itemNo": 7, "itemDescription": "4K Monitor - 37", "quantity": 4000, "unitPrice": 465},
{"itemNo": 8, "itemDescription": "4K Monitor - 42", "quantity": 4000, "unitPrice": 565}
],
"assets":
[
{"type": "Order", "id": "001", "buyer": "yes@softwaresolutionsinc.com", "seller": "bob@pchardwareinc.com", "items": [{"itemNo": 1, "quantity": 5}, {"itemNo": 2, "quantity": 2}, {"itemNo": 6, "quantity": 2}] },
{"type": "Order", "id": "002", "buyer": "yes@softwaresolutionsinc.com", "seller": "jojo@innovativesolutionsinc.com", "items": [{"itemNo": 2, "quantity": 5}, {"itemNo": 8, "quantity": 2}] },
{"type": "Order", "id": "003", "buyer": "yes@softwaresolutionsinc.com", "seller": "Erin@2ndlifesystemsinc.com", "items": [{"itemNo": 3, "quantity": 15}, {"itemNo": 4, "quantity": 20}] },
{"type": "Order", "id": "004", "buyer": "yes@softwaresolutionsinc.com", "seller": "aiesha@cloudninesoftwareinc.com", "items": [{"itemNo": 1, "quantity": 5}, {"itemNo": 2, "quantity": 2}, {"itemNo": 6, "quantity": 2}] },
{"type": "Order", "id": "005", "buyer": "yes@softwaresolutionsinc.com", "seller": "joshua@officeexpertsinc.com", "items": [{"itemNo": 2, "quantity": 5}, {"itemNo": 8, "quantity": 2}] },
{"type": "Order", "id": "006", "buyer": "eric@bornonthecloudinc.com", "seller": "Erin@2ndlifesystemsinc.com", "items": [{"itemNo": 3, "quantity": 15}, {"itemNo": 4, "quantity": 20}] },
{"type": "Order", "id": "007", "buyer": "eric@bornonthecloudinc.com", "seller": "bob@pchardwareinc.com", "items": [{"itemNo": 1, "quantity": 5}, {"itemNo": 2, "quantity": 2}, {"itemNo": 6, "quantity": 2}] },
{"type": "Order", "id": "008", "buyer": "eric@bornonthecloudinc.com", "seller": "jojo@innovativesolutionsinc.com", "items": [{"itemNo": 2, "quantity": 5}, {"itemNo": 8, "quantity": 2}] },
{"type": "Order", "id": "009", "buyer": "eric@bornonthecloudinc.com", "seller": "Erin@2ndlifesystemsinc.com", "items": [{"itemNo": 3, "quantity": 15}, {"itemNo": 4, "quantity": 20}] }
]
}
然后我打开一个管理连接并遍历成员（参与者）和资产。我已经包含代码段的第一部分，它遍历成员并将它们添加到相应的注册表中并为它们创建标识。为资产执行此操作的代码类似。您将注意到在身份过程中，会员ID和秘密被写入本地文件。这对于生产系统来说是一个糟糕的想法，但是使教程更易于管理。您显然希望以不同的方式处理身份创建。
exports.autoLoad = function(req, res, next) {
// get the autoload file
let newFile = path.join(path.dirname(require.main.filename),'startup','memberList.json');
let startupFile = JSON.parse(fs.readFileSync(newFile));
// connect to the network
let businessNetworkConnection;
let factory;
let adminConnection = new AdminConnection();
adminConnection.connect(config.composer.connectionProfile, config.composer.adminID, config.composer.adminPW)
.then(() => {
businessNetworkConnection = new BusinessNetworkConnection();
return businessNetworkConnection.connect(config.composer.connectionProfile, network, adminID, adminPW)
.then(() => {
factory = businessNetworkConnection.getBusinessNetwork().getFactory();
for (let each in startupFile.members)
{(function(_idx, _arr)
{
return businessNetworkConnection.getParticipantRegistry(NS+'.'+_arr[_idx].type)
.then(function(participantRegistry){
return participantRegistry.get(_arr[_idx].id)
.then((_res) => {console.log('['+_idx+'] member with id: '+_arr[_idx].id+' already exists in Registry '+NS+'.'+_arr[_idx].type)})
.catch((error) => {
let participant = factory.newResource(NS, _arr[_idx].type, _arr[_idx].id);
participant.companyName = _arr[_idx].companyName;
participantRegistry.add(participant)
.then(() => {
console.log('['+_idx+'] '+_arr[_idx].companyName+" successfully added");
})
.then(() => {
return businessNetworkConnection.issueIdentity(NS+'.'+_arr[_idx].type+'#'+_arr[_idx].id, _arr[_idx].pw)
.then((result) => {
let _mem = _arr[_idx];
_mem.secret = result.userSecret;
_mem.userID = result.userID;
memberTable.push(_mem);
svc.saveMemberTable(memberTable);
})
.catch((error) => {
console.error('create id for '+_arr[_idx].id+'failed.',error.message);
});
})
.catch((error) => {console.log(_arr[_idx].companyName+" add failed",error);});
});
})
.catch((error) => {console.log('error with getParticipantRegistry', error)});
})(each, startupFile.members)
}
这里引用的所有代码都在ZeroToBlockchain教程和git repo的第5章中。该教程仍在开发中，但在本节中已完成，可在此处获取：https://github.com/rddill-IBM/ZeroToBlockchain
答案 1 :(得分：0)
JSON必须符合Composer所期望的格式 - 特别是它必须具有$ class属性来指示类型信息。
如果您的数据是预期的格式，那么您可以通过对composer-rest-server执行HTTP POST来创建资产（例如，使用bash和curl），或者您可以使用Node.js SDK创建一个命令行应用程序，它从磁盘读取JSON文件，然后使用资产注册表API创建资产。