Exemplo de context fonte: https://stephenafamo.com/blog/gracefully-shutting-down-multiple-workers-in-go/

exemplo context.go

package main

import (
    "context"
    "fmt"
    "log"
    "net/http"
    "os"
    "os/signal"
    "sync"
    "syscall"
    "time"
)

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)

    var wg sync.WaitGroup

    go func() {
        signals := make(chan os.Signal, 1)
        signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
        <-signals

        cancel()
    }()

    wg.Add(1)
    go func() {
        if err := myWorker(ctx); err != nil {
            cancel()
        }
        wg.Done()
    }()

    wg.Add(1)
    go func() {
        if err := startServer(ctx); err != nil {
            cancel()
        }
        wg.Done()
    }()

    wg.Wait()
}

func myWorker(ctx context.Context) error {

    var shouldStop = false

    go func() {
        <-ctx.Done()
        shouldStop = true
    }()

    for !shouldStop {
        err := doSomethingRepeatedly()
        if err != nil {
            return err
        }
    }

    return nil
}

func startServer(ctx context.Context) error {

    var srv http.Server

    go func() {
        <-ctx.Done() // Wait for the context to be done

        // Shutdown the server
        if err := srv.Shutdown(context.Background()); err != nil {
            // Error from closing listeners, or context timeout:
            log.Printf("HTTP server Shutdown: %v", err)
        }
    }()

    if err := srv.ListenAndServe(); err != http.ErrServerClosed {
        // Error starting or closing listener:
        return fmt.Errorf("HTTP server ListenAndServe: %w", err)
    }

    return nil
}