support using duplicate checker to prevent duplicate submissions for new transaction record

pkg/duplicatechecker/duplicate_checker_container.go

@@ -0,0 +1,38 @@
+package duplicatechecker
+
+import (
+	"github.com/mayswind/ezbookkeeping/pkg/errs"
+	"github.com/mayswind/ezbookkeeping/pkg/settings"
+)
+
+// DuplicateCheckerContainer contains the current duplicate checker
+type DuplicateCheckerContainer struct {
+	Current DuplicateChecker
+}
+
+// Initialize a duplicate checker container singleton instance
+var (
+	Container = &DuplicateCheckerContainer{}
+)
+
+// InitializeDuplicateChecker initializes the current duplicate checker according to the config
+func InitializeDuplicateChecker(config *settings.Config) error {
+	if config.DuplicateCheckerType == settings.InMemoryDuplicateCheckerType {
+		checker, err := NewInMemoryDuplicateChecker(config)
+		Container.Current = checker
+
+		return err
+	}
+
+	return errs.ErrInvalidDuplicateCheckerType
+}
+
+// Get returns whether the same submission has been processed and related remark by the current duplicate checker
+func (c *DuplicateCheckerContainer) Get(checkerType DuplicateCheckerType, uid int64, identification string) (bool, string) {
+	return c.Current.Get(checkerType, uid, identification)
+}
+
+// Set saves the identification and remark to in-memory cache by the current duplicate checker
+func (c *DuplicateCheckerContainer) Set(checkerType DuplicateCheckerType, uid int64, identification string, remark string) {
+	c.Current.Set(checkerType, uid, identification, remark)
+}