- Ubuntu 18.04
- FISCO BCOS v2.1.0
- Python 3.6.3+
- FISCO BCOS Python SDK
- Flask 1.1
- MacOS
- Xcode
- 链端：Loan.sol 合约中实现完整供应链金融平台逻辑
- 后端：python-sdk/Loan_contract_invoke.py实现对Loan合约调用的封装；python-sdk/Loan_contract_flask_backend.py运行服务端，接受外部请求并返回JSON数据
- 前端：Loan_UI中是一个完整的iOSApp工程
Ubuntu配置好依赖环境后，将 Loan.sol 部署到节点上，若成功部署，会得到 合约地址。你可以先在控制台中调用合约，产生一些实例以及发送交易。
用得到的合约地址替换 python-sdk/Loan_contract_flask_backend.py，Line 9 中的地址，将语句改为：
loan_contract = Loan_Contract(address=your_new_address)注意保留双引号
假设在你的Ubuntu中，FISCO BCOS Python SDK路径为 $FB-Python-SDK。
将 Loan.sol 复制到你的 $FB-Python-SDK/contracts 中；
将 python-sdk/Loan_contract_invoke.py 和 python-sdk/Loan_contract_flask_backend.py 复制到你的 $FB-Python-SDK 中
此时运行 Loan_contract_flask_backend.py，服务端会在8383端口监听请求。
请求示例：
- 获取名称为A的公司的信息
GET: {IP}:8383/get_company_inf/?cpName=A
- 获取所有公司A参与交易的单据
GET: {IP}:8383/get_receipt/?cpName=A
- 获取银行bank_1向公司A提供的信用资产的数额
GET: {IP}:8383/get_AmountOfCreditAsset_bank_GiveTo_TrustedCompany/?bName=bank_1&cpName=A
在MacOS中打开 Loan_UI/Loan_UI.xcworkspace，在Xcode点击运行按钮即可使用前端界面。
注意修改 Loan_UI/Loan_UI/SearchCompanyPage/SearchCompanyViewController.m，Loan_UI/Loan_UI/SearchReceiptPage/SearchReceiptViewController.m 和 Loan_UI/Loan_UI/SearchCreditAssetPage 里的URL
背景介绍、方案设计和功能测试等详见 17343107_王明业.pdf。
Demo见本目录下的.mp4视频。
An independent work. Finish the whole platform including the front end, the back end and the chain end. Use the consortium blockchain platform FISCO-BCOS maintained by Tencent.
Consider the following scenario:
There are three companies A, B and C. Company A has a large scale, good credit, great risk-bearing capacity, and is qualified to directly obtain large amounts of financing from banks and other financial institutions.
Companies B and C are small and cannot obtain large amount of money directly from any financial institutions.
Now Company A orders a batch of goods from company B. Company B needs to order supplementary materials from company C to produce this batch of goods.
Company A is currently short of funds. A document signed by company A is sent to company B, promising to pay company B for the goods. At this time, company B can use this document to get a loan from the bank, With the credit of company A.
And company B can sign a document to company C in the same way. Company C can get a loan from the bank through the document.
Under the traditional method, such a process requires a very complicated authorization and verification process.
This project uses blockchain technology to efficiently implement such a credit transfer process and realize a blockchain-based supply chain financial platform.