go-interview-problems/08-request-with-failover/task.go

package main

import (
	"context"
	"errors"
)

type Getter interface {
	Get(ctx context.Context, address string) ([]byte, error)
}

var (
	ErrTaskFailed = errors.New("task execution failed")
	getter        Getter
)

// RequestWithFailover attempts to request a data from available addresses:
// 1. If error, immediately try the address without waiting
// 2. If an address doesn't respond within 500ms, try the next but keep the original request running
// 3. Return the first successful response, or all ErrTaskFailed if all nodes fail
// 4. Properly handle context cancellation throughout the process
func RequestWithFailover(ctx context.Context, addresses []string) ([]byte, error) {
	return nil, nil
}