time.Ticker — Periodic Tasks

package main

import (
    "context"
    "fmt"
    "time"
)

func runPeriodic(ctx context.Context, interval time.Duration, work func()) {
    t := time.NewTicker(interval)
    defer t.Stop()                              // ALWAYS Stop the ticker

    for {
        select {
        case <-t.C:
            work()
        case <-ctx.Done():
            fmt.Println("stopping:", ctx.Err())
            return
        }
    }
}

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
    defer cancel()
    runPeriodic(ctx, 250*time.Millisecond, func() {
        fmt.Println("tick", time.Now().Format(time.TimeOnly))
    })
}