George Bach gebv

npm init -y
npm i ethers

Set provider

let provider = new ethers.providers.JsonRpcProvider("https://bscrpc.com", 56) // bsc
// let provider = new ethers.providers.WebSocketProvider("wss://..........", 56) // bsc

How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

Be Careful with Table Driven Tests and `t.Parallel()`

We Gophers, love table-driven-tests, it makes our unittesting structured, and makes it easy to add different test cases with ease.

Let’s create our table driven test, for convenience, I chose to use t.Log as the test function. Notice that we don't have any assertion in this test, it is not needed to for the demonstration.

func TestTLog(t *testing.T) {
	t.Parallel()

INTRO

Concurrency is a domain I have wanted to explore for a long time because the locks and the race conditions have always intimidated me. I recall somebody suggesting concurrency patterns in golang because they said "you share the data and not the variables".

Amused by that, I searched for "concurrency in golang" and bumped into this awesome slide by Rob Pike: https://talks.golang.org/2012/waza.slide#1 which does a great job of explaining channels, concurrency patterns and a mini-architecture of load-balancer (also explains the above one-liner).

Let's dig in:

	// Copyright 2020 Kentaro Hibino. All rights reserved.
	// Use of this source code is governed by a MIT license
	// that can be found in the LICENSE file.

	package asynq

	import (
	"context"
	"errors"
	"fmt"

	import (
	"context"
	"crypto/ecdsa"
	"crypto/elliptic"
	"encoding/json"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/ethereum/go-ethereum/log"
	"io/ioutil"

	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title>WebAssembly Real-Time Face Detection</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	</head>
	<style>
	body {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;

	package main

	import (
	"github.com/kardianos/service"
	"log"
	"flag"
	)

	type Service struct {}

	// fetch ace's language tools module:
	var langTools = ace.require('ace/ext/language_tools');

	// data stub:
	var sqlTables = [
	{ name: 'users', description: 'Users in the system' },
	{ name: 'userGroups', description: 'User groups to which users belong' },
	{ name: 'customers', description: 'Customer entries' },
	{ name: 'companies', description: 'Legal entities of customers' },
	{ name: 'loginLog', description: 'Log entries for user log-ins' },

	package main

	import (
	"fmt"
	"net/http"
	"sort"
	"time"
	)

	// a struct to hold the result from each request including an index

George Bach gebv

How to create an HTTPS certificate for localhost domains

Be Careful with Table Driven Tests and t.Parallel()

INTRO

Goroutines

Be Careful with Table Driven Tests and `t.Parallel()`