Amazon Web Services (AWS) offers free tier web servers where you can run simple go programs for API backends or websites. In this guide we will make a simple web server using a go program. This guide can also be used as a reference to set up AWS instances for larger go services.
To begin you will need to set up a new instance on AWS. To do this simply login to your AWS account and click on Services at the top of the screen and then on EC2. EC2 should be the first option under the Compute category.
Click on Instances on the left hand side and then in the top left there should be a large button called Launch Instance which will start a creation wizard. I typically search for Ubuntu and pick 18.04 as shown in the screenshot below.
In my previous post I wrote a guide on how to post a simple Slack message using a bot with PHP. Now we will do the same thing but instead with Go. I have also decided to send a json request instead of a form-url encoded request like we did with PHP. There are some differences, let’s take a look.
A Quick Disclaimer: I'm a programmer and have very little experience trading. Please do your own research before using the algorithm I create for the cryptocurrency trading bot or any other algorithm. Only trade with money you can afford to lose.
In this guide I will show you how to create a cryptocurrency trading bot with Go. I highly recommend an IDE such as Goland but you can use a simple text editor if you would like. Feel free to take a look at my guide on how to develop with Go on Linux if you don’t have Go installed.
I stumbled across a scraper and crawler framework written in Go called Colly. Colly makes it really easy to scrape content from web pages with it’s fast speed and easy interface. I have always been interested in web scrapers ever since I did a project for my university studies and you can read about that project here. Before continuing, please note that scraping of websites is not always allowed and sometimes even illegal. In the guide below we will be parsing this blog, GoPHP.io.
This guide assumes you are using Ubuntu Linux 16.04 (Xenial) but will most likely work for setting up a Go development environment on other versions of linux. You can still follow this guide if you are using OSX but some small things will differ such as the binary to download. You could always run Go on Linux in a Virtual Machine with Virtual Box.
Sometimes when I am working with dummy database I might need to change the password of a generated user. The easiest way to do this is to got to google for a bcrypt generator and then paste the generated hash into the database in order to update the password. This is much quicker than having to write a function to do this for me or to create a new user from scratch. It is also useful if I need to reset a password to an account which I have totally lost access to. Turns out I don’t like many of the bcrypt generators that are out there and the domain bcrypt.fun was available so I figured, why not make my own generator since I already created password.fun.
The current script is pretty simple and I plan to expand on it to make a tool that will allow you to track any cryptocurrencies along with a gained or lost amount or percentage based on at what price and how much you purchased these coins for.