Golang exponential back off simple example

exponential_backoff.go

package main

import "fmt"
import "time"
import "math"

var exponentialBackoffCeilingSecs int64 = 14400 // 4 hours

func main() {
  fmt.Println("Hello World")
  
  lastUpdatedAt := time.Now()
  attempts := 0
  
  for true {
    if time.Now().Sub(lastUpdatedAt).Hours() >= 12 {
      attempts = 0
    }
    
    lastUpdatedAt = time.Now()
    attempts += 1
    
    // exponential back-off implemented
    delaySecs := int64(math.Floor((math.Pow(2, float64(attempts)) - 1) * 0.5))
    if delaySecs > exponentialBackoffCeilingSecs {
      delaySecs = exponentialBackoffCeilingSecs
    }
    
    // should only get here if the ffmpeg record stream process dies
    fmt.Printf("this is %d attempt to restart. waiting %d seconds and then restarting\n", attempts, delaySecs)
    
    time.Sleep(time.Duration(delaySecs) * time.Second)
  }
}

Hello World
this is 1 attempt to restart. waiting 0 seconds and then restarting
this is 2 attempt to restart. waiting 1 seconds and then restarting
this is 3 attempt to restart. waiting 3 seconds and then restarting
this is 4 attempt to restart. waiting 7 seconds and then restarting
this is 5 attempt to restart. waiting 15 seconds and then restarting
this is 6 attempt to restart. waiting 31 seconds and then restarting
this is 7 attempt to restart. waiting 63 seconds and then restarting
this is 8 attempt to restart. waiting 127 seconds and then restarting