showbridge-go/internal/module/time-interval.go

package module

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

	"github.com/jwetzell/showbridge-go/internal/common"
	"github.com/jwetzell/showbridge-go/internal/config"
)

type TimeInterval struct {
	config   config.ModuleConfig
	Duration uint32
	ctx      context.Context
	router   common.RouteIO
	ticker   *time.Ticker
	logger   *slog.Logger
	cancel   context.CancelFunc
}

func init() {
	RegisterModule(ModuleRegistration{
		Type: "time.interval",
		New: func(config config.ModuleConfig) (common.Module, error) {
			params := config.Params

			durationInt, err := params.GetInt("duration")
			if err != nil {
				return nil, fmt.Errorf("time.interval duration error: %w", err)
			}
			return &TimeInterval{Duration: uint32(durationInt), config: config, logger: CreateLogger(config)}, nil
		},
	})
}

func (i *TimeInterval) Id() string {
	return i.config.Id
}

func (i *TimeInterval) Type() string {
	return i.config.Type
}

func (i *TimeInterval) Start(ctx context.Context) error {
	i.logger.Debug("running")
	router, ok := ctx.Value(common.RouterContextKey).(common.RouteIO)

	if !ok {
		return errors.New("time.interval unable to get router from context")
	}
	i.router = router
	moduleContext, cancel := context.WithCancel(ctx)
	i.ctx = moduleContext
	i.cancel = cancel

	ticker := time.NewTicker(time.Millisecond * time.Duration(i.Duration))
	i.ticker = ticker
	defer ticker.Stop()

	for {
		select {
		case <-i.ctx.Done():
			i.logger.Debug("done")
			return nil
		case <-ticker.C:
			if i.router != nil {
				i.router.HandleInput(i.ctx, i.Id(), time.Now())
			}
		}
	}

}

func (i *TimeInterval) Output(ctx context.Context, payload any) error {
	i.ticker.Reset(time.Millisecond * time.Duration(i.Duration))
	return nil
}

func (i *TimeInterval) Stop() {
	i.cancel()
}

func (i *TimeInterval) Get(key string) (any, error) {
	switch key {
	case "duration":
		return i.Duration, nil
	default:
		return nil, errors.New("time.interval key not found")
	}
}