github.com/zekroTJA/timedmap

~ timedmap ~

A map which has expiring key-value pairs.

       

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go get -u github.com/zekroTJA/timedmap

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Intro

This package allows to set values to a map which will expire and disappear after a specified time.

Here you can read the docs of this package, generated by pkg.go.dev.

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Usage Example

package main

import (
	"log"
	"time"

	"github.com/zekroTJA/timedmap"
)

func main() {
	// Create a timed map with a cleanup timer interval of 1 second
	tm := timedmap.New(1 * time.Second)
	// Set value of key "hey" to 213, which will expire after 3 seconds
	tm.Set("hey", 213, 3*time.Second)
	// Print the value of "hey"
	printKeyVal(tm, "hey")
	// Block the main thread for 5 seconds
	// After this time, the key-value pair "hey": 213 has expired
	time.Sleep(5 * time.Second)
	// Now, this function should show that there is no key "hey"
	// in the map, because it has been expired
	printKeyVal(tm, "hey")
}

func printKeyVal(tm *timedmap.TimedMap, key interface{}) {
	d, ok := tm.GetValue(key).(int)
	if !ok {
		log.Println("data expired")
		return
	}

	log.Printf("%v = %d\n", key, d)
}

Further examples, you can find in the example directory.

If you want to see this package in a practcal use case scenario, please take a look at the rate limiter implementation of the REST API of myrunes.com, where I have used timedmap for storing client-based limiter instances:
https://github.com/myrunes/backend/blob/master/internal/ratelimit/ratelimit.go

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Copyright (c) 2020 zekro Development (Ringo Hoffmann).
Covered by MIT licence.