Implement basic rss reader structure

youtubeWatcher/rssfeed.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"sync"
+	"time"
+)
+
+type RssFeed struct {
+	Url       string
+	Id        string
+	LastSeen  time.Time
+	fileMutex sync.Mutex
+}
+
+func (f *RssFeed) UpdateLastSeen() error {
+	log.Printf("[%s]: Updating last seen time", f.Id)
+	lastSeen, err := f.ReadLastSeen()
+	if err != nil {
+		return fmt.Errorf("failed to read lastseen file for feed %s: %w", f.Id, err)
+	}
+	f.LastSeen = lastSeen
+	log.Printf("[%s]: Last seen time updated to: %s", f.Id, f.LastSeen)
+	return nil
+}
+func (f *RssFeed) ReadLastSeen() (time.Time, error) {
+	f.fileMutex.Lock()
+	defer f.fileMutex.Unlock()
+
+	lastSeen := time.Now()
+	log.Printf("[%s]: Attempting to open lastseen file...", f.Id)
+	lastSeenFile, err := os.Open("lastseen")
+	if err != nil {
+		if os.IsNotExist(err) {
+			log.Printf("[%s]: lastseen file does not exist, creating a new one...", f.Id)
+			lastSeenFile, err = os.Create("lastseen" + f.Id)
+			if err != nil {
+				return lastSeen, fmt.Errorf("failed to create lastseen file: %w", err)
+			}
+			log.Printf("[%s]: Writing current time to lastseen file...", f.Id)
+			lastSeenFile.Write([]byte(lastSeen.Format(time.RFC3339)))
+			lastSeenFile.Sync()
+			log.Printf("[%s]: Successfully created lastseen file with current time.", f.Id)
+			return lastSeen, nil
+		} else {
+			log.Printf("[%s]: Error opening lastseen file: %v", f.Id, err)
+			return lastSeen, fmt.Errorf("failed to read lastseen file: %w", err)
+		}
+	}
+	log.Printf("[%s]: Reading contents of lastseen file...", f.Id)
+	lastSeenBytes, err := io.ReadAll(lastSeenFile)
+	if err != nil {
+		log.Printf("[%s]: Error reading lastseen file: %v", f.Id, err)
+		return lastSeen, fmt.Errorf("failed to read lastseen file: %w", err)
+	}
+	log.Printf("[%s]: Parsing lastseen time...", f.Id)
+	lastSeen, err = time.Parse(time.RFC3339, string(lastSeenBytes))
+	if err != nil {
+		log.Printf("[%s]: Error parsing lastseen file: %v", f.Id, err)
+		return lastSeen, fmt.Errorf("failed to parse lastseen file: %w", err)
+	}
+	lastSeenFile.Close()
+	log.Printf("[%s]: Last seen time read: %s", f.Id, lastSeen)
+	return lastSeen, nil
+}
+
+func (f *RssFeed) WriteLastSeen(when time.Time) error {
+	f.fileMutex.Lock()
+	defer f.fileMutex.Unlock()
+
+	log.Printf("[%s]: Attempting to create lastseen file...", f.Id)
+	lastSeenFile, err := os.Create("lastseen" + f.Id)
+	if err != nil {
+		log.Printf("[%s]: Error creating lastseen file: %v", f.Id, err)
+		return fmt.Errorf("failed to create lastseen file: %w", err)
+	}
+	log.Printf("[%s]: Successfully created lastseen file: lastseen%s", f.Id, f.Id)
+
+	log.Printf("[%s]: Writing last seen time to file: %s", f.Id, when.Format(time.RFC3339))
+	_, err = lastSeenFile.Write([]byte(when.Format(time.RFC3339)))
+	if err != nil {
+		log.Printf("[%s]: Error writing to lastseen file: %v", f.Id, err)
+		return fmt.Errorf("failed to write to lastseen file: %w", err)
+	}
+	log.Printf("[%s]: Successfully wrote last seen time to file.", f.Id)
+
+	err = lastSeenFile.Close()
+	if err != nil {
+		log.Printf("[%s]: Error closing lastseen file: %v", f.Id, err)
+		return fmt.Errorf("failed to close lastseen file: %w", err)
+	}
+	log.Printf("[%s]: Lastseen file closed successfully.", f.Id)
+	return nil
+}