hyperledger Fabric 1.4的商业票据的智能合约

/ SPDX-License-Identifier: Apache-2.0 /

'use strict';

// Fabric smart contract classes const { Contract, Context } = require('fabric-contract-api');

// PaperNet specifc classes const CommercialPaper = require('./paper.js'); const PaperList = require('./paperlist.js');

/**

A custom context provides easy access to list of all commercial papers */ class CommercialPaperContext extends Context {

constructor() {
```
 super();
 // All papers are held in a list of papers
 this.paperList = new PaperList(this);
```
}

}

/**定义商业票据

Define commercial paper smart contract by extending Fabric Contract class / class CommercialPaperContract extends Contract {

constructor() {
```
 // Unique namespace when multiple contracts per chaincode file
 super('org.papernet.commercialpaper');
```
}

/**
- Define a custom context for commercial paper */ createContext() { return new CommercialPaperContext(); }
  
  /**
- Instantiate to perform any setup of the ledger that might be required.
- @param {Context} ctx the transaction context */ async instantiate(ctx) { // No implementation required with this example // It could be where data migration is performed, if necessary console.log('Instantiate the contract'); }
  
  /**
- Issue commercial paper *
- @param {Context} ctx the transaction context
- @param {String} issuer commercial paper issuer
- @param {Integer} paperNumber paper number for this issuer
- @param {String} issueDateTime paper issue date
- @param {String} maturityDateTime paper maturity date
- @param {Integer} faceValue face value of paper */ async issue(ctx, issuer, paperNumber, issueDateTime, maturityDateTime, faceValue) {
  
  // create an instance of the paper let paper = CommercialPaper.createInstance(issuer, paperNumber, issueDateTime, maturityDateTime, faceValue);
  
  // Smart contract, rather than paper, moves paper into ISSUED state paper.setIssued();
  
  // Newly issued paper is owned by the issuer paper.setOwner(issuer);
  
  // Add the paper to the list of all similar commercial papers in the ledger world state await ctx.paperList.addPaper(paper);
  
  // Must return a serialized paper to caller of smart contract return paper.toBuffer(); }
  
  /**
- Buy commercial paper *
- @param {Context} ctx the transaction context
- @param {String} issuer commercial paper issuer
- @param {Integer} paperNumber paper number for this issuer
- @param {String} currentOwner current owner of paper
- @param {String} newOwner new owner of paper
- @param {Integer} price price paid for this paper
- @param {String} purchaseDateTime time paper was purchased (i.e. traded) */ async buy(ctx, issuer, paperNumber, currentOwner, newOwner, price, purchaseDateTime) {
  
  // Retrieve the current paper using key fields provided let paperKey = CommercialPaper.makeKey([issuer, paperNumber]); let paper = await ctx.paperList.getPaper(paperKey);
  
  // Validate current owner if (paper.getOwner() !== currentOwner) {
```
 throw new Error('Paper ' + issuer + paperNumber + ' is not owned by ' + currentOwner);
```
  }
  
  // First buy moves state from ISSUED to TRADING if (paper.isIssued()) {
```
 paper.setTrading();
```
  }
  
  // Check paper is not already REDEEMED if (paper.isTrading()) {
```
 paper.setOwner(newOwner);
```
  } else {
```
 throw new Error('Paper ' + issuer + paperNumber + ' is not trading. Current state = ' +paper.getCurrentState());
```
  }
  
  // Update the paper await ctx.paperList.updatePaper(paper); return paper.toBuffer(); }
  
  /**
- Redeem commercial paper *
- @param {Context} ctx the transaction context
- @param {String} issuer commercial paper issuer
- @param {Integer} paperNumber paper number for this issuer
- @param {String} redeemingOwner redeeming owner of paper
- @param {String} redeemDateTime time paper was redeemed */ async redeem(ctx, issuer, paperNumber, redeemingOwner, redeemDateTime) {
  
  let paperKey = CommercialPaper.makeKey([issuer, paperNumber]);
  
  let paper = await ctx.paperList.getPaper(paperKey);
  
  // Check paper is not REDEEMED if (paper.isRedeemed()) {
```
 throw new Error('Paper ' + issuer + paperNumber + ' already redeemed');
```
  }
  
  // Verify that the redeemer owns the commercial paper before redeeming it if (paper.getOwner() === redeemingOwner) {
```
 paper.setOwner(paper.getIssuer());
 paper.setRedeemed();
```
  } else {
```
 throw new Error('Redeeming owner does not own paper' + issuer + paperNumber);
```
  }
  
  await ctx.paperList.updatePaper(paper); return paper.toBuffer(); }

}

module.exports = CommercialPaperContract;

hyperledger的商业票据的智能合约

hyperledger Fabric 1.4的商业票据的智能合约

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