这篇文章的内容紧接着上章的内容，上一篇讲了合约部署的基本操作，文章最后讲了通过来调用部署成功的合约中的方法，之所以能够直接调用合约中的方式，是因为默认集成了。如果想在环境使用合约，就要手动集成这两个模块。
集成NodeJS
1.首先需要安装包管理器，这里就不讲安装过程，如果已经安装过最好把更新到最新版本，不然在后面的操作中可能会报错，以下就是我在操作过程中遇到的一个错误。- var BigNumber = (new Web3()).toBigNumber(0).constructor; ^TypeError: (intermediate value).toBigNumber is not a function
- $ npm initThis utility will walk you through creating a package.json file.It only covers the most common items, and tries to guess sensible defaults.See `npm help json` for definitive documentation on these fieldsand exactly what they do.Use `npm install ` afterwards to install a package andsave it as a dependency in the package.json file.Press ^C at any time to quit.package name: (truffletest) truffletest //回车或输入括号内的包名version: (1.0.0) 1.0.0 //同上license: (ISC) //同上About to write to /Users/cyril/Desktop/truffleTest/package.json:{ "name": "truffletest", "version": "1.0.0", "description": "truffle with nodejs", "main": "main.js", "directories": { "test": "test" }, "scripts": { "test": "truffletest" }, "repository": { "type": "git", "url": "main.js" }, "keywords": [ "truffletest" ], "author": "cyril", "license": "ISC", "dependencies": { "truffle-contract": "^3.0.6", "web3": "^1.0.0-beta2" }}Is this OK? (yes) yes //同前面的操作
项目结构如下：
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安装中用到的合约抽象层运行环境是提供的，用于在和浏览器中集成的合约抽象运行环境。- $ npm install truffle-contractnpm notice created a lockfile as package-lock.json. You should commit this file.+ truffle-contract@3.0.6added 24 packages from 18 contributors and audited 25 packages in 13.15sfound 0 vulnerabilities
- $ npm install web3npm WARN deprecated web3@1.0.0-beta2: This version has faulty dependecy links.+ web3@1.0.0-beta2added 1 package from 1 contributor and audited 26 packages in 1.752sfound 0 vulnerabilities
这里就用前面的和，部署流程就不讲了，在项目根目录下创建，内容大体结构如下- //引入依赖，并初始化一个实例Web3var Web3 = require('web3');var provider = new Web3.providers.HttpProvider("http://localhost:8545");//省略了无关代码//合约初始化var Test = contract(/*合约JSON*/);//合约的元数据 //设置连接Test.setProvider(provider);//设置默认地址Test.defaults({ from : "0x299127d72e28cb92d09f856aaedeb139d1e7e74a"});//函数调用//TODO
- var Web3 = require('web3');var contract = require("truffle-contract");var provider = new Web3.providers.HttpProvider("http://localhost:8545");//使用truffle-contract包的contract()方法//请务必使用你自己编译的.json文件内容var Test = contract({ "contractName": "Test", "abi": [ { "constant": true, "inputs": [], "name": "f", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "pure", "type": "function" }, { "constant": true, "inputs": [], "name": "g", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "pure", "type": "function" } ], "networks": { "1536568575803": { "events": {}, "links": {}, "address": "0x57fec0a6d60ce7a133bbc6f7ac64f99a7b97425f", "transactionHash": "0x84463c7b8bce644a4df200ed1afdb3714514696cb32eef443854ca2dc2e56a70" }, "1536655141628": { "events": {}, "links": {}, "address": "0x03873f72987988a143d514f43a6c548fe8d252b9", "transactionHash": "0xd3b7577fb5aae6a5950c0b2e04e1211f26ce487dda065d264bf6c61e2b453983" } }, "schemaVersion": "2.0.1", "updatedAt": "2018-09-11T09:04:16.743Z"});Test.setProvider(provider);//随便从testrpc提供的地址中拷贝一个Test.defaults({ from: "0x807b0d9ffc27ecdc481bd1fc84fd3d4fb054c324" });//调用合约方法var instance;Test.deployed().then(function (func) { instance = func; return instance.f.call();}).then(function (value) { console.log(value); return instance.g.call();}).then(function (value) { console.log(value);});
注意：
1.最好原封不动的把json文件的内容拷贝过来，为了节约篇幅，我就只粘贴了部分，虽然不影响正常测试，但可能遇到下面的错误：- node_modules/truffle->contract/node_modules/web3/lib/web3/contract.js:56 contract.abi.filter(function (json) { ^TypeError: Cannot read property 'filter' of undefined
- (node:26922) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): Error: invalid address
运行，然后报了如下错：- $ node main.js module.js:487 throw err; ^Error: Cannot find module 'web3-requestManager'
- $ npm install ethereum/web3.js+ web3@0.20.7added 4 packages from 4 contributors, updated 1 package and audited 32 packages in 58.834sfound 0 vulnerabilities
- $ node main.js method f()method g()
下面的代码依然是放在里- var Web3 = require('web3');var contract = require("truffle-contract");var provider = new Web3.providers.HttpProvider("http://localhost:8545");var Greeter = contract({ "contractName": "Greeter", "abi": [ { "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "constant": true, "inputs": [], "name": "greet", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_newgreeting", "type": "string" } ], "name": "setGreeting", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [], "name": "kill", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "networks": { "1536568575803": { "events": {}, "links": {}, "address": "0x4cf91392df7740176d74f63faf9991ec838a6473", "transactionHash": "0x33b9776384f25342d51799970744b44dcfedf55a36093d55a72c5323dcbc8cf5" }, "1536655141628": { "events": {}, "links": {}, "address": "0x2eb0113712145ffb42889c9421a6881e864ff2b4", "transactionHash": "0x748948df55b1597223d54cc6184d7a43ac47a04a559fafd9eb49e3c02c1abe98" } }, "schemaVersion": "2.0.1", "updatedAt": "2018-09-11T09:04:16.744Z"});Greeter.setProvider(provider);Greeter.defaults({ from: "0xd10e318f0ef3e74c6e75e0827b840b2d00a49af5"});var ins;Greeter.deployed().then(function (value) { ins = value; return ins.setGreeting("hello");}).then(function (value) { console.log(value); return ins.greet.call();}).then(function (value) { console.log(value);});
- $ node main.js { tx: '0x887d1043feb6f1e65bd90c71840b6b8fe8b2eea6ac19ad82dbd3c61c8eccae4c', receipt: { transactionHash: '0x887d1043feb6f1e65bd90c71840b6b8fe8b2eea6ac19ad82dbd3c61c8eccae4c', transactionIndex: 0, blockHash: '0x323b5d22dbea9f4d7c1e70da5a0dc2b4b96f453afd6a3ae80c989470804c6562', blockNumber: 17, gasUsed: 33090, cumulativeGasUsed: 33090, contractAddress: null, logs: [], status: 1 }, logs: [] }//greet()方法输出内容hello
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