Graceful shutdown or restart

There are a few approaches you can use to perform a graceful shutdown or restart. You can make use of third-party packages specifically built for that, or you can use the app.Shutdown(context.Context) method. Examples can be found here.

Register an event on CTRL/CMD+C using iris.RegisterOnInterrupt:

idleConnsClosed := make(chan struct{})
iris.RegisterOnInterrupt(func() {
    timeout := 10 * time.Second
    ctx, cancel := stdContext.WithTimeout(stdContext.Background(), timeout)
    defer cancel()
    // close all hosts.
    app.Shutdown(ctx)
    close(idleConnsClosed)
})

// [...]
app.Listen(":8080", iris.WithoutInterruptHandler, iris.WithoutServerError(iris.ErrServerClosed))
<-idleConnsClosed