Learn Go in ~5mins
This is inspired by A half-hour to learn Rust and Zig in 30 minutes.
Basics
Your first Go program as a classical "Hello World" is pretty simple:
First we create a workspace for our project:
View hello.yml
| --- | |
| version: "3.8" | |
| services: | |
| hello: | |
| image: prologic/hello-go | |
| networks: | |
| - traefik | |
| deploy: | |
| mode: replicated |
View go.mod
| module twtxt-search-engine | |
| go 1.14 | |
| require ( | |
| github.com/gocolly/colly/v2 v2.1.0 | |
| github.com/jointwt/twtxt v0.0.0-20210108082814-7098fcfa49df | |
| github.com/prologic/read-file-last-line v0.0.0-20200806014221-326f63458987 | |
| github.com/sirupsen/logrus v1.7.0 | |
| ) |
View traefik.yml
| --- | |
| version: "3.8" | |
| services: | |
| traefik: | |
| image: traefik:latest | |
| ports: | |
| - target: 80 | |
| published: 80 | |
| protocol: tcp |
View hello.yml
| --- | |
| version: "3.8" | |
| services: | |
| hello: | |
| image: r.mills.io/prologic/hello-go | |
| networks: | |
| - traefik | |
| deploy: | |
| mode: replicated |
View main.go
| package main | |
| import ( | |
| "bytes" | |
| "crypto/hmac" | |
| "crypto/md5" | |
| "encoding/hex" | |
| "fmt" | |
| "hash" | |
| "net" |
View figure.xml
| <figure> | |
| <a href="pics/earth2150/lc-combat-ucs.jpg"> | |
| <img src="pics/earth2150/lc-combat-ucs.jpg" /> | |
| </a> | |
| <figcaption> | |
| <abbr title="Lunar Corporation">LC</abbr>hovertanks battle mechs guarding a | |
| <abbr title="United Civilized States">UCS</abbr>base. A large mech is shooting rockets at a hovertank, while its shields protect it from an electro cannon attack. Two repairers fix a visibly damaged nuclear power plant.</figcaption> | |
| </figure> |
View test.sh
| # ./congine /bin/sh | |
| # hostname | |
| container | |
| # id | |
| uid=0(root) gid=0(root) groups=0(root),0(root),65534,65534,65534,65534,65534,65534 | |
| # ps aux | |
| PID USER TIME COMMAND | |
| 1 root 0:00 /bin/sh | |
| 4 root 0:00 ps aux | |
| # Container Terminated |
View log
| Loading /etc/os-release ... | |
| You should have EPEL enabled to install all the prerequisites. | |
| Check: http://www.tecmint.com/how-to-enable-epel-repository-for-rhel-centos-6-5/ | |
| Running in non-interactive mode | |
| > CentOS Version: 8 ... | |
| > Checking for epel ... | |
| Running in non-interactive mode, assuming yes (y) | |
| > Would have promptedfor epel not found, shall I install it? ... | |
| yum -y install epel-release | |
| CentOS-8 - AppStream [=== ] --- B/s | 0 B --:-- ETA CentOS-8 - AppStream100% [====================] 1.4 kB/s | 681 B 00:00 ETA CentOS-8 - AppStream 17% [===- ] 242 kB/s | 1.2 MB 00:22 ETA CentOS-8 - AppStream 35% [======= ] 461 kB/s | 2.3 MB 00:09 ETA CentOS-8 - AppStream 45% [========= ] 565 kB/s | 3.0 MB 00:06 ETA CentOS-8 - AppStream 56% [=========== ] 687 kB/s | 3.7 MB 00:04 ETA CentOS-8 - AppStream 70% [============== ] 825 kB/s | 4.6 MB 00:02 ETA CentOS-8 - AppStream 85% [================= ] 979 kB/s | 5.6 MB |
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