Initial commit.

rss/storage.go

@@ -0,0 +1,64 @@
+package rss
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+var processedItemsDir string
+
+//nolint:gochecknoinits
+func init() {
+	userHomeDir, err := os.UserHomeDir()
+	if err != nil {
+		panic("Failed to get user's home directory: " + err.Error())
+	}
+
+	processedItemsDir = strings.Replace("~/.rsser", "~", userHomeDir, 1)
+
+	if err := os.MkdirAll(processedItemsDir, 0o755); err != nil {
+		panic("Failed to create ~/.rsser: " + err.Error())
+	}
+}
+
+func (r *RSS) addProcessedItem(domain, guid string) error {
+	file, err := os.OpenFile(
+		filepath.Join(processedItemsDir, domain),
+		os.O_APPEND|os.O_CREATE|os.O_WRONLY,
+		0o644,
+	)
+	if err != nil {
+		return fmt.Errorf("add processed item: %w", err)
+	}
+	defer file.Close()
+
+	if _, err := file.WriteString(guid + "\n"); err != nil {
+		return fmt.Errorf("add processed item: %w", err)
+	}
+
+	return nil
+}
+
+func (r *RSS) checkItemWasProcessed(domain, guid string) (bool, error) {
+	fileDataBytes, err := os.ReadFile(filepath.Join(processedItemsDir, domain))
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return false, nil
+		}
+
+		return false, fmt.Errorf("check item processing: %w", err)
+	}
+
+	fileData := string(fileDataBytes)
+
+	for line := range strings.Lines(fileData) {
+		if line == guid+"\n" {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}