How to Develop a Simple Solidity Escrow Smart Contracts Using Hardhat | by Agustinus Theodorus | Jun, 2022

In this tutorial, we’ll create a simple escrow smart contract, test it, and deploy it on a Testnet using Hardhat. watercolor wallpaper vector created by Freepik Suppose you’re relatively new to the blockchain, no worries. First, we’ll review some of the fundamentals of Solidity and Hardhat before programming our smart contract step-by-step. At the end … Read more

How to Build a Simple CLI With Oclif

Salesforce developers have contributed much to the open-source community. Among their many contributions is an important, but perhaps lesser-known, project named oclif. The Open CLI Framework was announced in early 2018 and has since grown to become the foundation for the Salesforce CLI and the Heroku CLI. In this post, we will provide a brief … Read more

cpu architecture – How many clock cycles do the stages of a simple 5 stage processor take?

Classic 5-stage RISC pipelines are designed around single-cycle latency L1d / L1i, allowing 1 IPC (instruction per clock) in code without cache misses or other stalls. ie the hopefully common / good case. Every stage must have a worst-case critical path latency of 1 cycle, or trigger a stall. Clock speeds were lower back then … Read more

Implement an Email Masking Proof-of-concept Using AWS Simple Email Service (SES) and AWS Rust SDK | by Julien de Charentenay | Jun, 2022

Stem the email marketing tide using masking Image by Anne-Onyme from Pixabay This story presents a proof-of-concept that allow me to give a unique email address anything@mydomain.com when subscribing to mailing lists, and registering unimportant accounts. anything can be any word that I decide on the spot when I give the address. The emails are … Read more

firebase – How to make a simple admin page in flutter with a given email and password in flutter?

How can I add an admin page to the existing pages? I just want one default admin to enter which will only display users from Firebase. I would like a specific email and password to be given which will allow access for that one admin. I’m attaching the login page import ‘package:firebase_auth/firebase_auth.dart’; import ‘package:flutter/material.dart’; import … Read more

Schedule Simple Go App Workloads Using Google Cloud Platform | by Mihai Bojin | Jun, 2022

A short tutorial on scheduling workloads using Infrastructure-as-Code with GCP, Docker, and Terraform Photo by Towfiqu barbhuiya on Unsplash Let’s say you need to run a job periodically. How would you do it? The traditional way is to provide a VM (somewhere), run crontab, and call whatever script/binary you want. This is simple, and it … Read more

Creating a Simple API Stub With API Gateway and S3

A while ago my team was looking to create a stub for an internal JSON HTTP-based API. The to-be stubbed service was quite simple. The service exposed a REST API endpoint for listing resources of a specific type. The API supported paging and some specific request/query parameters. GET requests to the service looked something like … Read more

Develop a Simple Rock Band Game With HTML and JavaScript | by Alvaro Montoro | Jun, 2022

Use the Gamepad API to build a music game for all levels In this article, we will learn how to develop a simple version of a Rock Band- or Guitar Hero-styled game using standard HTML and vanilla JavaScript. It is a short version of the workshop “Rocking the Gamepad API” that we did as part … Read more

Simple LDAP authentication using Java

I am using LDAP authentication using Java . I am using the following code but its throwing error Exception in thread “main” javax.naming.AuthenticationException:[LDAP:errorcode49-80090308:LdapErr:DSID-0C09044Ecomment:AcceptSecurityContexterrordata52ev2580[LDAP:errorcode49-80090308:LdapErr:DSID-0C09044Ecomment:AcceptSecurityContexterrordata52ev2580 Java Code i am using package test; import java.util.*; import javax.naming.*; import javax.naming.directory.*; public class LoginLDAP { public static void main(String[] args) throws Exception { Map<String,String> params = createParams(args); // firstname.lastname@mydomain.com // … Read more

bash – Centos 8 – simple command in a shell script run with sudo privelige says “command not found”

I’m trying to run script as sudo that’s throwing errors on very simple commands on CentOS Linux release 8.4.2105 VM. The script works fine when run without sudo. “myuser” is a valid sudo user. Here is the script as run from the command prompt: #sudo ./xtest.sh Here’s the script: #!/bin/bash echo “shell: $SHELL” grep abc … Read more