refactor: add cache tests and remove cache merge task (#14)

cache/cache.go

@@ -1,19 +1,15 @@
 package cache
 
 import (
-	"context"
 	"fmt"
 	"github.com/l3uddz/nabarr/logger"
-	"github.com/lefelys/state"
 	"github.com/rs/zerolog"
 	"github.com/xujiajun/nutsdb"
-	"time"
 )
 
 type Client struct {
 	log zerolog.Logger
 
-	st state.State
 	db *nutsdb.DB
 }
 
@@ -33,54 +29,14 @@ func New(path string) (*Client, error) {
 
 	log := logger.New("trace").With().Logger()
 
-	// start cleaner
-	st, tail := state.WithShutdown()
-	ticker := time.NewTicker(24 * time.Hour)
-	go func() {
-		for {
-			select {
-			case <-tail.End():
-				ticker.Stop()
-				tail.Done()
-				return
-			case <-ticker.C:
-				// clean cache
-				err := db.Update(func(tx *nutsdb.Tx) error {
-					return db.Merge()
-				})
-
-				switch {
-				case err == nil:
-					log.Info().Msg("Cleaned cache")
-				case err.Error() == "the number of files waiting to be merged is at least 2":
-				// there were no data files to be merged
-				default:
-					// unexpected error
-					log.Error().
-						Err(err).
-						Msg("Failed cleaning cache")
-				}
-			}
-		}
-	}()
-
 	return &Client{
 		log: log,
-		st:  st,
-		db:  db,
+
+		db: db,
 	}, nil
 }
 
 func (c *Client) Close() error {
-	// shutdown cleaner
-	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
-	defer cancel()
-	if err := c.st.Shutdown(ctx); err != nil {
-		c.log.Error().
-			Err(err).
-			Msg("Failed shutting down cache cleaner gracefully")
-	}
-
 	// close cache
 	return c.db.Close()
 }