Rust Types in Javascript - SoproxABI

Installation
SoproxABI is a separate npm package from Soprox framework.
Repo: https://github.com/DescartesNetwork/soprox-abi​
SoproxABI is usually installed along with all SoproX templates. However, if you would like to install it manually, you can the following to install the latest version.
npm install soprox-abi
Import SoproxABI
const soproxABI = require('soprox-abi');
Quick Tutorial
// Please refer @solana/web3 for fetch account data
// https://solana-labs.github.io/solana-web3.js/class/src/connection.js~Connection.html#instance-method-getAccountInfo
const connection = ...
const { data } = await connection.getAccountInfo(mintPublicKey)
​
const MINT_SCHEMA = [
  { key: "mint_authority_option", type: "u32" },
  { key: "mint_authority", type: "pub" },
  { key: "supply", type: "u64" },
  { key: "decimals", type: "u8" },
  { key: "is_initialized", type: "bool" },
  { key: "freeze_authority_option", type: "u32" },
  { key: "freeze_authority", type: "pub" },
];
​
const mintLayout = new soproxABI.struct(schema.MINT_SCHEMA);
const readableData = mintLayout.fromBuffer(data);
More examples are available here.
APIs
Primary types
Rust type
Javascript type
Keyword
Space (bytes)
bool
bool
bool
1
char
string
char
4
i8
number
i8
1
i16
number
i16
2
i32
number
i32
4
i64
bigInt
i64
8
i128
bigInt
i128
16
u8
number
u8
1
u16
number
u16
2
u32
number
u32
4
u64
bigInt
u64
8
u128
bigInt
u128
16
array
array
[<type>;<length>]
depends on length
tuple
object
(<type>;<type>;...)
depends on length
Pubkey
Base58<Buffer>
pub
32
Struct
Struct is a complex type that is a combination of primary types. With this type, we can easily represent inputs of an on-chain function, data forms of on-chain accounts.
The create function won't affect on the struct type.
To define the data schema of a struct, we use an array where each element is an object including key, type, and/or schema for is nested struct.
Simple struct
const schema = [
    { "key": "pet", "type": "(char;u32;bool)" },
    { "key": "owner", "types": "[char;12]" },
    { "key": "male", "types": "bool" },
]
const petStruct = new soproxABI.struct(schema);
Nested struct
const schema = [
    { "key": "productCode", "type": "pub" },
    { 
        "key": "description", "schema": [
            { "key": "colorized", "type": "bool" },
            { "key": "amount", "type": "u64" }, 
        ]
    }
]
const productStruct = new soproxABI.struct(schema);
Static functions
You can call these functions directly from soproxABI. For example,
const counter = soproxABI.create('[u8;5]', [1,2,3,4,5]);
Function
Description
Interface
create
Create an instance of type
create(type: string, value: (optional) initial value)
span
Compute space in bytes of a variable
span(variable: a SoproxABI variable)
pack
Concatenate all buffers into a single buffer
pack(buffer_1, <buffer_2>, ...)
Class functions
These functions are only called from a class instance. For example,
const toggle = new soproxABI.bool(false);
toggle.toBuffer() // toBuffer is an instance function
Function
Description
Interface
toBuffer
Return a buffer represents the value of a type
toBuffer()
fromBuffer
Assign buffer data to a type
fromBuffer(buf: Buffer)
Examples
Get data length in bytes - For rent account
To rent an account on Solana, you need to compute the data space for the rent-exemption.
const schema = [
    { key: "numGreets", type: "u32" },
    { key: "toggleState", type: "bool" }
]
const layout = new soproxABI.struct(schema);
const space = layout.space; // 5 bytes - the needed space for the account
Parse account data
Parse a dummy account in a hello-world program
// Please refer @solana/web3 for fetch account data
// https://solana-labs.github.io/solana-web3.js/class/src/connection.js~Connection.html#instance-method-getAccountInfo
const { data } = await connection.getAccountInfo(dummyAccount.publicKey);
​
const schema = [
    { key: "numGreets", type: "u32" },
    { key: "toggleState", type: "bool" }
]
const layout = new soproxABI.struct(schema);
layout.fromBuffer(data);
​
// Finally
console.log(layout.value);
Calling function
Call sayHello function to a hello-world program
Approach #1
const schema = [
    { key: "numGreets", type: "u32" },
    { key: "toggleState", type: "bool" }
]
const layout = new soproxABI.struct(schema, {
    numGreets: 1,
    toggleState: true
});
const code = new soproxABI.u8(0); // 0 is corresponding to sayHello
const data = soproxABI.pack(code, layout);
​
// Finally
console.log(data);
Approach #2
const schema = [
    { key: "code", type: "u8" },
    { key: "numGreets", type: "u32" },
    { key: "toggleState", type: "bool" }
]
const layout = new soproxABI.struct(schema, {
    code: 0, // 0 is corresponding to sayHello
    numGreets: 1,
    toggleState: true
});
const data = soproxABI.pack(code, layout);
​
// Finally
console.log(data.toBuffer());
Two approaches will end up with the same result.

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Outline

Get data length in bytes - For rent account

Parse account data

Calling function