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Blockchain Smart Contract & Frontend Programming (EOS EOSIO)
The next thing to discuss after Solidity itself is sandboxes for playing around with contracts. Let's say you've written a contract, and you want to test it out, see if it works.
How do you do that? You're right if you think that you aren't supposed to deploy every Hello World and draft contract to mainnet. Even though there are testnets maintained Ethereum blockchain where the social contract is that the native ETH is worthless, and is not transferable to other chains , the general workflow doesn't go straight to testnets either. Instead, there are dev chains, virtual chains you can spin up on your machine as needed. That helps you see if your contract is compiling, and lets you test the contract's functions and variables to see if they work as intended.
There are limitations to dev chains - one easy example is that if you're building something that interacts with DAI, it'll mean deploying a clone of Maker DAI to your dev chain every time you spin it up, in addition to deploying your own contracts.
It is still a great first step. Just to clarify, a traditional deployment contains the following steps. First, the contracts need to be compiled. These are used in development quite a bit.
Then there is the actual deployment, sending the bytecode of a contract to the chain in a transaction. In order to interact with a contract, you need to know its location on a chain the contract address , and you need its ABI. Etherscan is a valuable tool for getting information on contracts on-chain.
For example, if you know a contract address, but don't know it's ABI, oftentimes Etherscan will have it, or be able to figure it out decompile the bytecode. Once you've deployed, how is your contract going to be interacted with?
There may be some cases where just having a contract on-chain is enough, and anyone interacting can be expected to use something like Remix in order to interact with it, but usually not.
I'm going to start with assuming that there is some kind of GUI in your project. If this is the case, you're going to want a framework. A blockchain framework will integrate your contracts into a frontend project, compiling your contracts into JSONs that can be understood by the frontend with proper tools, more on that later , providing the ability to spin up dev chains, and to deploy contracts.
The most popular framework is Truffle. Many of the online resources that teach dApp development teach Truffle, too. Truffle can compile, exposes dev chain tools in the form of Ganache, and more. That being said, I recommend Hardhat. Similar to Truffle I believe it's actually built out of Truffle , you can compile contracts, and get access to dev chains. There's more, though. Solidity does not have console. Hardhat also has fewer compilation issues in my personal experience.
Looking at you, node-gyp. There are also more amenities. Before you go and try and set up your own Hardhat environment, let's talk about web3 libraries, and then I'll have a suggestion which should make that far easier.
Where's the JavaScript code for instantiating a Contract object, and then for calling a function on that contract? Actually, what functions do you use to connect to the chain at all? Obviously, JS doesn't have that built-in. This is where web3 libraries come in. The two most prominent libraries in JavaScript are Web3. I personally find the latter much easier to work with, and would recommend you do the same.
One pro tip is that the current Ethers v5 has docs that are still a work in progress. If you have trouble finding or understanding something in the v5 docs, search the v4 docs as well. The search is more robust, and there are more code snippets. This has been a lot - you need contracts, a framework environment, and a web3 library.
Naturally, there is. Scaffold-Eth has an out-of-the-box environment set up with Hardhat and a ton more in the context of a React app. It is by far the most painless way to get started, as it has little to no configuration. There is a ton going on in Scaffold, including custom hooks and components.
There is even a custom contract component that gives you a near-frictionless way to interact with contracts very similar to Remix. Austin Griffith the author has a super hyper mode three-minute run-through on an older version of Scaffold here , and a longer walkthrough here.
I strongly recommend it. How does your React app tap into the network? You need to either run your own node or connect to a service that runs them.
While I recommend running your own node, and even wrote a long article about installing Geth, I have to admit using a service is the more widespread practice.
I would recommend Nethermind for running your own node for various reasons. These are figured for mainnet, testnets need significantly less space, and can probably get by with less memory.
Nethermind is written in. In terms of services, Infura is the most well-known and widely used, though newcomer Alchemy deserves a good look too. In terms of your actual development, whether or not you run your own node or use a service, the actual impact on your codebase is about half a line when you instantiate a web3 object and need to know what to connect it to.
You could also use other wallets, but MetaMask is still the king in my book. Writing to the blockchain is expensive. You literally pay for each bit of information you write or alter onchain.
This makes for some interesting optimization in code, but it also makes you think about what should go on-chain at all. Something the chain serves poorly is data storage. Where should it go then? Some centralized server? Decentralized file storage also relies on decentralized peer-to-peer networks, just like blockchains. They specialize in taking data in storing it, though.
The highest-profile of them right now is Filecoin, though I would personally also mention Swarm and Sia. Swarm in particular. I can also quickly master any new programming languages. Web Development I enjoy developing web frontend and backend. I created this site and the blogging system from scratch using Laravel and BootStrap. I'm more than a full stack developer. And I created several shareware using Windows-only technology such as Delphi more than 10 years ago.
Now I focus on cross platform technology such as Qt. Blockchain Development Blockchain development is the thing I'm most interested in right now. I have a lot of experience with master-node coins and Bitcoin derived blockchains. I am looking forward to creating really useful blockchain product for the benefit of the world. Game Development I worked in several large global gaming companies for more than 12 years.
The gold standard is Open Zeppelin. The repository for their contracts are here , and they have their own npm package. The next thing to discuss after Solidity itself is sandboxes for playing around with contracts.
Let's say you've written a contract, and you want to test it out, see if it works. How do you do that? You're right if you think that you aren't supposed to deploy every Hello World and draft contract to mainnet.
Even though there are testnets maintained Ethereum blockchain where the social contract is that the native ETH is worthless, and is not transferable to other chains , the general workflow doesn't go straight to testnets either. Instead, there are dev chains, virtual chains you can spin up on your machine as needed.
That helps you see if your contract is compiling, and lets you test the contract's functions and variables to see if they work as intended. There are limitations to dev chains - one easy example is that if you're building something that interacts with DAI, it'll mean deploying a clone of Maker DAI to your dev chain every time you spin it up, in addition to deploying your own contracts.
It is still a great first step. Just to clarify, a traditional deployment contains the following steps. First, the contracts need to be compiled.
These are used in development quite a bit. Then there is the actual deployment, sending the bytecode of a contract to the chain in a transaction. In order to interact with a contract, you need to know its location on a chain the contract address , and you need its ABI. Etherscan is a valuable tool for getting information on contracts on-chain. For example, if you know a contract address, but don't know it's ABI, oftentimes Etherscan will have it, or be able to figure it out decompile the bytecode.
Once you've deployed, how is your contract going to be interacted with? There may be some cases where just having a contract on-chain is enough, and anyone interacting can be expected to use something like Remix in order to interact with it, but usually not. I'm going to start with assuming that there is some kind of GUI in your project. If this is the case, you're going to want a framework. A blockchain framework will integrate your contracts into a frontend project, compiling your contracts into JSONs that can be understood by the frontend with proper tools, more on that later , providing the ability to spin up dev chains, and to deploy contracts.
The most popular framework is Truffle. Many of the online resources that teach dApp development teach Truffle, too. Truffle can compile, exposes dev chain tools in the form of Ganache, and more. That being said, I recommend Hardhat. Similar to Truffle I believe it's actually built out of Truffle , you can compile contracts, and get access to dev chains. There's more, though. Solidity does not have console. Hardhat also has fewer compilation issues in my personal experience. Looking at you, node-gyp.
There are also more amenities. Before you go and try and set up your own Hardhat environment, let's talk about web3 libraries, and then I'll have a suggestion which should make that far easier. Where's the JavaScript code for instantiating a Contract object, and then for calling a function on that contract? Actually, what functions do you use to connect to the chain at all? Obviously, JS doesn't have that built-in. This is where web3 libraries come in. The two most prominent libraries in JavaScript are Web3.
I personally find the latter much easier to work with, and would recommend you do the same. One pro tip is that the current Ethers v5 has docs that are still a work in progress. If you have trouble finding or understanding something in the v5 docs, search the v4 docs as well. The search is more robust, and there are more code snippets. This has been a lot - you need contracts, a framework environment, and a web3 library.
Naturally, there is. More precisely, we explored how Ethereum works, what a decentralized application DApp is and how to build one, and also covered the key concepts of Solidity and web3. To brush up your knowledge and skills, on second round of recipes, we are going to build a Tontine DApp game. We will exploit this example to explore new tools that are going to change the way you build DApps, and introduce new Solidity features.
In this walkthrough, we will discover how a tool such as Truffle can aid in building, testing, debugging, and deploying our DApp. Truffle makes it possible to start a DApp project easily using a collection of delicious Truffle boxes. A box is basically a boilerplate template for giving developers the ability to build robust and adaptable DApps quickly.
One of these boxes is the Drizzle box. In this recipe, we will build a web interface for our game with Drizzle instead of using bare-metal JavaScript and web3. To get started with Drizzle, it's preferable to have basic knowledge of ReactJS, and will require the installation of the following ingredients:.
Drizzle is a collection of frontend libraries that make writing DApp frontends easier and more predictable. Drizzle is based on the popular React framework, Redux, which is a predictable state container for JavaScript applications most commonly used with ReactJS for building user interfaces. Thus, it helps you write applications that behave consistently, solving the problems related to state mutation in highly asynchronous and non deterministic environments.
The Drizzle box comes with everything you need to start using smart contracts from a React App. We just unpack its box and then we can build a DApp in a few steps. You can write a React app from scratch using Drizzle packages, but to save you time and effort, I opt for using the box template and editing its code.
First, you have to create a new empty folder for the Drizzle box, otherwise Truffle will refuse to download the Drizzle box files. Start by creating a new dedicated folder: mkdir DrizzleTontine. Then, install the Drizzle box: truffle unbox drizzle. After a few seconds two sips of coffee , it should output the following:.
To run the example packed within the Drizzle box, you should already have the local Ganache network running. If not, start Ganache on port Ganache-cli -p As we have a new Truffle project, we need to edit truffle.
Otherwise, you can edit the development network port defined already in truffle. The next step is to compile and publish the smart contracts that come with the truffle compile box. Then, publish the compiled smart contracts to the truffle migrate Ganache blockchain. As a result, you'll see the Webpack server launching, and inside the browser, a nice DApp web interface. As well as showing the Drizzle logo, the page will show a few forms to interact with the sample contracts provided by the box, as illustrated in the following screenshot:.
If MetaMask is not already connected to Ganache, you can skip to the Connecting ganache to MetaMask section to fix this issue. In a few steps, you have deployed a full DApp with a clean interface, interacting with three different contracts, without writing a single line of code. Developer Freelancer. I create amazing software for you, for the world.
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Frontend tools for Blockchain Developers
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I can also quickly master any new programming languages. Web Development I enjoy developing web frontend and backend. I created this site and the blogging system from scratch using Laravel and BootStrap. I'm more than a full stack developer. And I created several shareware using Windows-only technology such as Delphi more than 10 years ago. Now I focus on cross platform technology such as Qt.
Blockchain Development Blockchain development is the thing I'm most interested in right now. I have a lot of experience with master-node coins and Bitcoin derived blockchains.
Building Blockchain Application for Ethereum DApp Game with Drizzle
First set covered the following nine recipes:. In short, you learned about how to set up and configure Ethereum and develop blockchain applications using Solidity programming language. We explored its key components, including smart contracts and Web3.
In second set, we discuss more advance topics in Ethereum blockchain development and solidity while building a Tontine DApp game step-by-step. Specifically, we cover Truffle and Drizzle. For instance, we show you how a tool such as Truffle can be an assistant in building, testing, debugging, and deploying DApps. In summary, we are going to cover four main topics:. In our first round of recipes, we learned a lot about the Ethereum ecosystem, but we are yet to realize the full potential of its different components.
More precisely, we explored how Ethereum works, what a decentralized application DApp is and how to build one, and also covered the key concepts of Solidity and web3. To brush up your knowledge and skills, on second round of recipes, we are going to build a Tontine DApp game. We will exploit this example to explore new tools that are going to change the way you build DApps, and introduce new Solidity features.
In this walkthrough, we will discover how a tool such as Truffle can aid in building, testing, debugging, and deploying our DApp. Truffle makes it possible to start a DApp project easily using a collection of delicious Truffle boxes. A box is basically a boilerplate template for giving developers the ability to build robust and adaptable DApps quickly. One of these boxes is the Drizzle box. In this recipe, we will build a web interface for our game with Drizzle instead of using bare-metal JavaScript and web3.
To get started with Drizzle, it's preferable to have basic knowledge of ReactJS, and will require the installation of the following ingredients:. Drizzle is a collection of frontend libraries that make writing DApp frontends easier and more predictable.
Drizzle is based on the popular React framework, Redux, which is a predictable state container for JavaScript applications most commonly used with ReactJS for building user interfaces. Thus, it helps you write applications that behave consistently, solving the problems related to state mutation in highly asynchronous and non deterministic environments.
The Drizzle box comes with everything you need to start using smart contracts from a React App. We just unpack its box and then we can build a DApp in a few steps. You can write a React app from scratch using Drizzle packages, but to save you time and effort, I opt for using the box template and editing its code.
First, you have to create a new empty folder for the Drizzle box, otherwise Truffle will refuse to download the Drizzle box files. Start by creating a new dedicated folder: mkdir DrizzleTontine. Then, install the Drizzle box: truffle unbox drizzle. After a few seconds two sips of coffee , it should output the following:.
To run the example packed within the Drizzle box, you should already have the local Ganache network running. If not, start Ganache on port Ganache-cli -p Additional information Deadline for application:. Sign Up Forgot Password? Favourites remove from favourites. Frontend developer. Similar job offers React. This is a spacious and promising market! Dmitry Plushevsky. Follow us. Facebook Medium Youtube. Sign up for newsletter.
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