Timeouts
Examples
Filter
Implementing timeouts in Go is easy and elegant thanks to channels and select.
package main
import (
"fmt"
"time"
)
func main() {
c1 := make(chan string, 1)
go func() {
time.Sleep(2 * time.Second)
c1 <- "result 1"
}()
// Here's the select implementing a timeout.
// res := <-c1 awaits the result and <-Time.After awaits a value to be sent after the timeout of 1s.
// Since select proceeds with the first receive that’s ready,
// we’ll take the timeout case if the operation takes more than the allowed 1s.
select {
case res := <-c1:
fmt.Println(res)
case <-time.After(1 * time.Second):
fmt.Println("timeout 1")
}
c2 := make(chan string, 1)
go func() {
time.Sleep(2 * time.Second)
c2 <- "result 2"
}()
select {
case res := <-c2:
fmt.Println(res)
// If we allow a longer timeout of 3s, then the receive from c2 will succeed and we’ll print the result.
case <-time.After(3 * time.Second):
fmt.Println("timeout 2")
}
}