sayheymirza / pay-as-you-go

This is a small and simple library for Golang to scheduler deduct user's wallet balance every X seconds.

Pay as you Go

This is a small and simple library for Golang to scheduler deduct user's wallet balance every X seconds.

• What is Pay As You Go ?
• Concept
• Example

What is Pay As You Go ?

One way to get money from a user is to deduct some money from the user's wallet based on a specific time, and if the user's wallet does not have money, we will no longer provide the service.

Concept

• DoFunc is a function for each X seconds when it comes time to pay them. why you need yo pass it? Because you want to reduce the amount of RAM consumed for each item.
• UUID is a unique id for a new pay as you go item. You can set it any things but it must be unique like: user transaction id in your database.
• Wallet is user wallet id and why you need to pass it? Because by passing it to DoFunc you can get your user's wallet balance and update it.

Example

In this example we use wallets that are in variable. We deduct wallet balance and print that every 10s.

package main

import (
	"fmt"

	payg "github.com/iamnonroot/pay-as-you-go"
)

type Wallets map[string]int

func main() {
    // [wallet id] => wallet balance balance
	var wallets Wallets = Wallets{
		"root": 1000,
		"user": 10000,
	}

	item := payg.New(&payg.Item{
		Every: 10, // every 10 seconds
		DoFunc: func(option payg.ItemOption) bool {
            // get wallet balance
			balance := wallets[option.Wallet]

            // if the wallet balance is low, delete scheduler by returning false
			if balance-option.Price < 0 {
				return false
			}

            // set wallet balance
			wallets[option.Wallet] = balance - option.Price

			fmt.Println(wallets[option.Wallet])

            // continue
			return true
		},
	})

	item.Add(payg.ItemOption{
		UUID:   "root-going", // a uuid for pay as you go
		Wallet: "root", // user's wallet id
		Price:  400, // product price
	})

	item.Add(payg.ItemOption{
		UUID:   "user-going",
		Wallet: "user",
		Price:  6000,
	})

	item.Start()
}