query-orchestration/internal/server/runner/poll.go

package runner

import (
	"context"
	"errors"
	"fmt"
	"log/slog"

	"queryorchestration/internal/serviceconfig/queue"

	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

type Server struct {
	cleanup func() error
	cfg     ListenerConfig
}

func (c *Server) Listen(ctx context.Context) {
	slog.Info("Listening to queue")
	defer func() {
		if err := c.cleanup(); err != nil {
			fmt.Printf("Error during cleanup: %v", err)
		}
	}()

	for {
		select {
		case <-ctx.Done():
			return
		default:
			err := c.pollMessage(ctx)
			if err != nil {
				slog.Error(err.Error())
			}
		}
	}

}

func (c *Server) pollMessage(ctx context.Context) error {
	result, err := c.cfg.ReceiveFromQueue(ctx, &queue.ReceiveParams{
		QueueURL: c.cfg.GetQueueURL(),
	})
	if err != nil {
		return fmt.Errorf("message fetch fail: %v", err)
	}

	for _, message := range result.Messages {
		err := c.processMessage(ctx, &message)
		if err != nil {
			slog.Error("message process fail", "id", *message.MessageId, "err", err)
		}
	}

	return nil
}

func (c *Server) processMessage(ctx context.Context, message *types.Message) error {
	slog.Debug("processing message", "id", *message.MessageId, "body", *message.Body)

	isProcessed := c.cfg.GetController().Process(ctx, message)
	if !isProcessed {
		return errors.New("message process fail")
	}

	err := c.cfg.DeleteFromQueue(ctx, &queue.DeleteParams{
		QueueURL:      c.cfg.GetQueueURL(),
		ReceiptHandle: message.ReceiptHandle,
	})
	if err != nil {
		return fmt.Errorf("message delete fail: %v", err)
	}

	return nil
}