Development utils for GO

Tiny but useful code snippets to link into your GO project.

Import / Fork / Cut-n-Paste .... up to you.

package main

import (
	"fmt"
	"github.com/steveoc64/godev/config"
	"github.com/steveoc64/godev/mail"
)

func main() {
	...

Use a config.json file to store your apps operational params, and load them at runtime.

func main() {

	cfg := config.LoadConfig()
	...

Loads the following file

{
	"Debug": false,
	"DataSourceName": "user=postgres password=xxxxxx dbname=dbdbdb sslmode=disable",
	"WebPort": 8000,
	"MailServer": "mail.mysite.com",
	"MailUser": "mailaccount",
	"MailPasswd": "xxxxxx",
	"MailPort": 465
}

Extend gopkg.in/gomail.v2 by adding an internal mailserver that uses channels. Runtime config requires the config package.

package main

import (
	"github.com/steveoc64/godev/config"
	"github.com/steveoc64/godev/mail"
)

func main() {

	cfg := config.LoadConfig()
	MailChannel := mail.InitMailer()

	m := mail.NewMail()
	m.SetHeader("To", "jack@sprat.com")
	m.SetHeader("Subject", "Loan Application")
	m.SetBody("text/html", "Awww Snap ! Your Loan Application has been denied  :(")
	MailChannel <- m

So inside your app, you create emails using the regular gomail functions, and then just add them to the MailChannel queue. A goroutine in the background works through the MailChannel queue, and does all the messy delivery stuff for you.

We have CPU cores ... lets use em !!!

package main

import (
	"fmt"
	"github.com/steveoc64/godev/smt"
)

func main() {

	cpus := smt.Init()
	fmt.Printf("Yo Ho Ho, here we Go on %d CPU cores\n", cpus)

By default, this code uses numCores := runtime.NumCPU(), but your policy may vary.

Clone this microlib if you want to maitain consitent CPU hogging policies across all your GO services. (and we are going to produce a tonne of them this year - true ?)

Code snippet to add Cors support to your Echo webserver

package main

import (
	"github.com/labstack/echo"
	"github.com/steveoc64/godev/echocors"
)

func main() {

	e := echo.New()
	if cfg.Debug {
		e.SetDebug(true)
	}
	echocors.Init(e, cfg.Debug)

Basic setup for using DAT / Postgres in your app, using the config lib for runtime paramaters.

Does a few basic tuning things, and then tests the connection by doing a "select now()"

package main

import (
	"github.com/steveoc64/godev/config"
	"github.com/steveoc64/godev/db"
)

func main() {

	cfg := config.LoadConfig()
	DB := db.Init(cfg.DataSourceName)