Memory Extension

Blockless Assembly Script SDK’s memory extension provides a way for you to read pre-set environment variables or any data passed from the networking layer directly from host memory.

Below is an example (opens in a new tab) of using the memory extension with Assembly Script:

import "wasi";
import { Console } from "as-wasi/assembly";
import { memory } from "../assembly";
 
let stdin = new memory.Stdin().read().toJSON();
if (stdin) {
  let results = stdin.get("results");
  if (results) {
    let newValue = Number.parseFloat(results.toString()) + 1000;
    Console.log("Hello " + newValue.toString());
  }
}
 
let envVars = new memory.EnvVars().read().toJSON();
if (envVars) {
  let environmentValue = envVars.get("ENV_VAR_NAME");
  if (environmentValue) {
    Console.log("Hello " + environmentValue.toString());
  }
}

For detailed reference, please refer to the reference section.

Module Install

You can start using the Blockless AssemblyScript SDK by installing the package to your new or existing project.

Using npm

$ npm i @blockless/sdk

Using yarn

$ yarn add @blockless/sdk

Module Import

import { memory } from "@blockless/sdk";

Usage

The memory extension module provides two classes, Stdin and EnvVars, to read data from host memory.

`Stdin` class

Stdin allows you to read data passed from the networking layer directly. To read data from Stdin, create a new instance of the Stdin class and use the read() method followed by toJSON() to parse the data into a JSON object.

You can also use toString() method to parse the data into a string object.

import { memory } from "@blockless/sdk";
 
let stdin = new memory.Stdin().read().toJSON();
 
if (stdin) {
  // Access data from the parsed JSON object
}

`EnvVars` class

EnvVars provides access to pre-set environment variables. Create a new instance of the EnvVars class and use the read() method followed by toJSON() to parse the environment variables into a JSON object.