How to Gracefully Stop a Goroutine Execution on Timeout in the Iris Framework?

Stopping Goroutine Execution on Timeout Using Iris Framework

When working with goroutines, it is often necessary to stop their execution if they exceed a certain time limit. However, a commonly encountered issue is that goroutines continue to execute even after a timeout has occurred.

In an attempt to address this problem, the following code snippet is used:

import (
    "fmt"
    "time"

    "github.com/kataras/iris/v12"
)

type Response struct {
    data   interface{}
    status bool
}

func (s *CicService) Find() (interface{}, bool) {

    ch := make(chan Response, 1)

    go func() {
      time.Sleep(10 * time.Second)

      fmt.Println("test")
      fmt.Println("test1")

      ch <- Response{data: "data", status: true}
    }()

    select {
    case <-ch:
      fmt.Println("Read from ch")
      res := <-ch
      return res.data, res.status
    case <-time.After(50 * time.Millisecond):
      return "Timed out", false
    }

}

This code utilizes a buffered channel and a select statement to attempt to terminate a goroutine if a timeout of 50 milliseconds passes. However, the expected output of "Timed out" is not achieved. Instead, the output includes both the timeout message and the subsequent "test" and "test1" printouts.

To understand why this occurs, it is important to consider the behavior of goroutines in Go. In Go, there is no efficient way to forcibly stop a running goroutine. Instead, synchronization mechanisms such as channels and mutexes must be employed.

The timeout employed in the code is a timeout on the channel's receiving operation, not on the goroutine itself. Hence, even if the receive operation times out, the goroutine that was sending to the channel continues to execute, resulting in the subsequent printouts.

In this situation, it is necessary to implement some form of synchronicity between the goroutines. This could involve using a signal channel or a context to communicate the timeout to the goroutine that is performing the long-running task, allowing it to gracefully handle the cancellation.

By understanding the limitations of goroutine execution in Go and employing appropriate synchronization techniques, it is possible to effectively stop goroutines on timeout.

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