feat(lib/store): implement valkey backend

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/store/valkey/factory.go

@@ -0,0 +1,84 @@
+package valkey
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/TecharoHQ/anubis/lib/store"
+	valkey "github.com/redis/go-redis/v9"
+)
+
+var (
+	ErrNoURL  = errors.New("valkey.Config: no URL defined")
+	ErrBadURL = errors.New("valkey.Config: URL is invalid")
+)
+
+func init() {
+	store.Register("valkey", Factory{})
+}
+
+type Factory struct{}
+
+func (Factory) Build(ctx context.Context, data json.RawMessage) (store.Interface, error) {
+	var config Config
+
+	if err := json.Unmarshal([]byte(data), &config); err != nil {
+		return nil, fmt.Errorf("%w: %w", store.ErrBadConfig, err)
+	}
+
+	if err := config.Valid(); err != nil {
+		return nil, fmt.Errorf("%w: %w", store.ErrBadConfig, err)
+	}
+
+	opts, err := valkey.ParseURL(config.URL)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %w", store.ErrBadConfig, err)
+	}
+
+	rdb := valkey.NewClient(opts)
+
+	if _, err := rdb.Ping(ctx).Result(); err != nil {
+		return nil, fmt.Errorf("can't ping valkey instance: %w", err)
+	}
+
+	return &Store{
+		rdb: rdb,
+	}, nil
+}
+
+func (Factory) Valid(data json.RawMessage) error {
+	var config Config
+	if err := json.Unmarshal([]byte(data), &config); err != nil {
+		return fmt.Errorf("%w: %w", store.ErrBadConfig, err)
+	}
+
+	if err := config.Valid(); err != nil {
+		return fmt.Errorf("%w: %w", store.ErrBadConfig, err)
+	}
+
+	return nil
+}
+
+type Config struct {
+	URL string `json:"url"`
+}
+
+func (c Config) Valid() error {
+	var errs []error
+
+	if c.URL == "" {
+		errs = append(errs, ErrNoURL)
+	}
+
+	if _, err := valkey.ParseURL(c.URL); err != nil {
+		errs = append(errs, ErrBadURL)
+	}
+
+	if len(errs) != 0 {
+		return fmt.Errorf("valkey.Config: invalid config: %w", errors.Join(errs...))
+	}
+
+	return nil
+}