The PDX Utopia block chain stack calls the wasm smart contract using soloutflow

PDXbaap
PDXbaap
Jan 11 · 4 min read

Pdx| tutorial

In this rapidly changing world, smart contracts have become a powerful service across all platforms.Solfund is a trend that PDX Utopia block chain stack USES solfund to call wasm smart contracts.

What is solfat?

Solfat is a high-level language with a syntax similar to that of JavaScript.It is designed to generate the ethereum virtual machine code in a compiled manner, and the salient advantage of the language is security.

As a statically typed language that supports inheritance, libraries, and complex user-defined types, solinland can be used to create various types of smart contracts for voting, crowdfunding, wallets, and more that run on the blockchain.

Sollion in the ethereum contract

Contracts are the basic building blocks of ethereum’s decentralized application.All variables and functions are part of the contract, which is the starting point for all projects.An empty contract called MyFirst looks like this:

Layout of solfat

The source file can contain any number of contract definitions, including directives and pragma directives.

annotation

Like any other language, solfat can use single-line and multi-line comments.

The type of value in solfat

The following types are also called value types because variables of these types will always be passed by value.

Solfat data structure

Solfat provides three types of data structures:

Wasm smart contracts are invoked using solfund

Define the ABI

> defines the Contract object in ‘hello-wasm-abi/ SRC /abi.rs’, including <br> in the’ hello-wasm ‘sample;

> ‘put/get/getcounter’ three methods’ ABI ‘description, note, we can not directly use’ JSON ‘to describe’ ABI ‘;

> must define the declaration using ‘pdxabi::Contract’.

The following three steps are recommended to generate the ABI:

1. Write ‘contract interface’ using ‘solglacial’;

2. Compile ‘contract interface’ with ‘remix’ to get the corresponding ‘ABI’ description;

3. Pdxabi ::Contract ‘;

After deploying the wasm contract, you can use the contract address and contract interface to instantiate the contract in the remix for easier testing.

Solidity Contract Interface

In the [Remix IDE] (http://remix.ethereum.org/#optimize=false&version=soljson-v0.5.3+commit.10d17f24.js&evmVersion=null&appVersion=0.7.7) write contract interface, and compile solidity.

Deployment and use

* deploy the contract in the same way as the ‘hello-wasm’ sample

[the README. Md] (https://github.com/PDXbaap/ewasm-rust-demo/blob/master/README.md) about ` deployment ` description:

* invoke contract:If ‘web3’ series’ SDK ‘is used,’ JSON ABI ‘+’ Contract Address ‘can be used to instantiate the Contract and make a call. If’ remix IDE ‘is used for test calls,You can use the ‘solmuddy Contract Interface’ + ‘Contract Address’ to instantiate the Contract and invoke the SDK and remix IDE provided by web3 for more information see the web3 foundation.

Solidity invokes the Wasm contract

With ` sol ` contracts to invoke ` wasm ` contracts, and ` sol ` call ` sol ` the same way, the assumption has been deployed ` hello — wasm — abi ` this contract, and get the address ` 0 xda3ce11d916ffba4a1289cef66a7f142ec5a0f74 `, through ` hello — wasm — abi ` contract interface and address can instantiate the contract, after usage and ` sol ` call ` sol ` consistent.

Such as:

Hello-wasm -abi contract interface

Call the wasm contract method

After deploying the ‘foobar’ contract, use the ‘hello-wasm-abi’ contract address:

` 0 xda3ce11d916ffba4a1289cef66a7f142ec5a0f74 ` respectively as the first parameter to invoke ` fetch ` and ` set ` method, complete the ` hello — wasm — abi ` contracts ` get ` and ` put ` calls.

- the public chain of PDX -

PDX public chain aims to build a public block chain ecosystem. As a public block chain IaaS, it helps enterprise customers, developer groups and ordinary users to enjoy the convenience and fun brought by block chain with powerful underlying patented technology.

The PDX public chain asserts that data sovereignty belongs to the user.

- join the community

The official Telegram

https://t.me/PDXann

https://t.me/PDXbaap

https://t.me/PDX_EngVIP

The official medium

https://medium.com/@pdxbaap

Official English twitter

https://twitter.com/PDXbaap

The official Facebook

https://www.facebook.com/PDXbaap

Official microblog PDXchain

https://weibo.com/PDXbaap/home

PDXbaap

Written by

PDXbaap

PDX BaaP is the world’s first real reconstruction blockchain, the blockbuster really make the key practical applications, but also the world’s only support in t

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch
Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore
Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade