基于区块链的毕业设计Ethereum / Solidity – 以太坊/实体

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Ethereum / Solidity

Development

Ethereum / Solidity - <a href=以太坊eth/实体”>

Development Workflow with Truffle

Truffle is a CLI tool. The workflow is like this:

Start a Truffle project with truffle init Run a local development Blockchain with truffle develop (Truffle comes with its own version of Ganache) Deploy your smart contract with truffle migrate --reset (the reset flag is necessary to avoid some caching problems) Run smart contract test with truffle test (includes web3 and BN.js) Deploy your frontend

How to use Infura?

To deploy a smart contract to Infura you need to:

Create a project in Infura Fund the deployment address (using a faucet in the case of testnet) Add a configuration for this deployment in the configuration file of your Truffle project Run the deployment with Truffle (ex: truffle migrate --reset --network ropsten) We will see this in details later in this course in the section on smart contract deployment.

Custom Scaffold

./compile.js ./test/ ./contracts/

  • Manual Set Up (without framesworks):

    • solidity compiler: solc
    • testing: mocha
    • local network + provider: ganache-cli
    • integrating client with network (deploy new or interact with existing contract): web3
  • Remix:

    • web IDE
    • manual testing
    • compile / deployment
  • Truffle:

    • contract creation
    • automated testing (JS: mocha, Solidity)
    • deploying to networks

Test Networks

Infura or host own node

  • Ropsten:
    • most similar to main net ∴ use occasionally
    • slow block times
  • Rinkeby:
    • least similar to main net than Ropsten ∴ use frequently
    • fast block times

Notes

  • gasPrice (Wei/gas): amount of Wei the sender is willing to pay per unit of gas
  • startGas/gasLimit (gas): total units of gas willing to spend for the transaction

Gotchas

  • Contract Functions:
    • call()
      • cannot modify data
      • returns data instantly from node (does not require processing a new block)
    • send()
      • modify a contracts data/state
      • takes block time!! ∴ think about the UX
      • returns a transaction hash
      • cost gas
    • Nested Dynamic Arrays
      • OK in Solidity
      • Doesn’t work in ABI/JS/Web3
      • String are stored as an array of chars ∴ an Array of Strings
      • experimental feature: pragma experimental ABIEncoderV2;

Articles:

Intro – https://blog.b9lab.com/unpacking-the-ethereum-stack-for-developers-c1be1dc41c06 Basic CRUD – https://medium.com/robhitchens/solidity-crud-part-1-824ffa69509a Simply State Machine – https://medium.com/coinmonks/state-machines-in-solidity-9e2d8a6d7a11


以太坊eth/Solidity

开发

Ethereum / Solidity - <a href=以太坊eth/实体”>

松露开发流程

Truffle是一个CLI工具。工作流程是这样的:

用Truffle init启动一个Truffle项目用Truffle develop运行一个本地开发区块链blockchain(Truffle附带自己的Ganache版本)用Truffle migrate部署您的智能合约-reset(reset标志是避免一些缓存问题所必需的)用Truffle test运行智能合约测试(包括web3和BN.js公司)部署您的前端

如何使用Infura?

要将智能合约部署到Infura,您需要:

在Infura基金中创建一个项目部署地址(在testnet的情况下使用水龙头)在您的Truffle项目的配置文件中添加此部署的配置使用Truffle运行部署(例如:Trufflemigrate–reset–network ropsten)我们将在本课程后面关于智能合约部署的部分中详细介绍。

自定义支架

/编译.js./test//contracts/

  • 手动设置(不带framesworks):solidity编译器:solc测试:mocha本地网络+提供商:ganache cli集成客户端和网络(部署新合同或与现有合同交互):web3
  • 最类似于主网∴偶尔使用慢速阻塞时间
  • startGas/gasLimit(gas):愿意为事务花费的gas总单位

测试网络

Infura或主机自身节点

  • 立即从节点返回数据(不需要处理新块)
  • 需要阻塞时间!!∴考虑UX∴∴∴∴∴返回事务哈希∴∴∴∴∴∴∴字符串数组实验特性:pragma experimental ABIEncoderV2;

注释

  • gasPrice (Wei/gas): amount of Wei the sender is willing to pay per unit of gas
  • startGas/gasLimit (gas): total units of gas willing to spend for the transaction

获取

  • Contract Functions:
    • call()
      • cannot modify data
      • returns data instantly from node (does not require processing a new block)
    • send()
      • modify a contracts data/state
      • takes block time!! ∴ think about the UX
      • returns a transaction hash
      • cost gas
    • Nested Dynamic Arrays
      • OK in Solidity
      • Doesn’t work in ABI/JS/Web3
      • String are stored as an array of chars ∴ an Array of Strings
      • experimental feature: pragma experimental ABIEncoderV2;

文章:

简介-https://blog.b9lab.com/unpacking-the-ethereum-stack-for-developers-c1be1dc41c06基本积垢https://medium.com/robhitchens/solidity-crud-part-1-824ffa69509a简单地陈述机器-https://medium.com/coinmonks/state-machines-in-solidity-9e2d8a6d7a11

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