Can you provide examples of using WithCancel, WithTimeout, and WithDeadline?

In the Go package context, there are functions for creating contexts with cancellation and timeout capabilities:

• WithCancel — creates a context that can be manually canceled by calling the cancel() function. Used when you need to interrupt an operation upon an event.

• WithTimeout — creates a context that automatically cancels after a specified period.

• WithDeadline — creates a context that cancels at a specific point in time.

Examples:

ctx, cancel := context.WithCancel(context.Background())
// Launch a goroutine that cancels the context after 2 seconds

go func() {
    time.Sleep(2 * time.Second)
    cancel()
}()

select {
case <-ctx.Done():
    fmt.Println("Operation canceled")
}

// WithTimeout
ctxTimeout, cancelTimeout := context.WithTimeout(context.Background(), 3*time.Second)
defer cancelTimeout()
// operation that will be interrupted after 3 seconds

// WithDeadline
deadline := time.Now().Add(5 * time.Second)
ctxDeadline, cancelDeadline := context.WithDeadline(context.Background(), deadline)
defer cancelDeadline()
// operation that will be interrupted at the specified time

These mechanisms are useful for controlling request execution time, canceling long operations, and resource management.