error handling for tracked players having no match found

utils/utils.go

@@ -217,16 +217,11 @@ type MatchResponse struct {
 	TickRate    float64     `json:"tick_rate,omitempty"`
 }
 
-type (
-	AuthcodeUnauthorizedError struct {
-		error
-	}
-	AuthcodeRateLimitError struct {
-		error
-	}
-	SharecodeNoMatchError struct {
-		error
-	}
+var (
+	SharecodeNoMatchError     = errors.New("sharecode not provided")
+	AuthcodeRateLimitError    = errors.New("temporary rate-limited/unavailable")
+	AuthcodeUnauthorizedError = errors.New("authcode unauthorized")
+	NoMatchError              = errors.New("no match found")
 )
 
 const (
@@ -485,7 +480,7 @@ func IsAuthCodeValid(player *ent.Player, apiKey string, shareCode string, authCo
 	if shareCode == "" {
 		tMatch, err = player.QueryMatches().Order(ent.Asc(match.FieldDate)).First(context.Background())
 		if err != nil {
-			return false, SharecodeNoMatchError{errors.New("sharecode not provided")}
+			return false, SharecodeNoMatchError
 		}
 
 		_, err := getNextShareCode(tMatch.ShareCode, apiKey, authCode, player.ID, rl)
@@ -505,11 +500,17 @@ func IsAuthCodeValid(player *ent.Player, apiKey string, shareCode string, authCo
 func GetNewShareCodesForPlayer(player *ent.Player, apiKey string, rl *rate.Limiter) ([]string, error) {
 	latestMatch, err := player.QueryMatches().Order(ent.Desc(match.FieldDate)).First(context.Background())
 	if err != nil {
+		if ent.IsNotFound(err) {
+			return nil, NoMatchError
+		}
 		return nil, err
 	}
 
 	oldestMatch, err := player.QueryMatches().Order(ent.Asc(match.FieldDate)).First(context.Background())
 	if err != nil {
+		if ent.IsNotFound(err) {
+			return nil, NoMatchError
+		}
 		return nil, err
 	}
 
@@ -561,13 +562,13 @@ func getNextShareCode(lastCode string, apiKey string, authCode string, steamId u
 	case http.StatusAccepted:
 		return "n/a", nil
 	case http.StatusTooManyRequests:
-		return "", AuthcodeRateLimitError{errors.New("temporary ratelimited")}
+		return "", AuthcodeRateLimitError
 	case http.StatusServiceUnavailable:
-		return "", AuthcodeRateLimitError{errors.New("temporary unavailable")}
+		return "", AuthcodeRateLimitError
 	case http.StatusPreconditionFailed:
-		return "", SharecodeNoMatchError{errors.New("sharecode not from player history")}
+		return "", SharecodeNoMatchError
 	case http.StatusForbidden:
-		return "", AuthcodeUnauthorizedError{errors.New("authcode unauthorized")}
+		return "", AuthcodeUnauthorizedError
 	case http.StatusOK:
 		break
 	default: