handle duplicate feeds

src/db.rs

@@ -25,7 +25,7 @@ const FEEDS_TABLE_CREATE: &str = "CREATE TABLE IF NOT EXISTS 'feeds' (
 	'title'	TEXT NOT NULL,
 	'description'	TEXT,
 	'icon'	BLOB,
-    'url' text, 
+    'url' text not null unique, 
 	'subscribed' INTEGER NOT NULL default 0,
 	'last_updated'	TEXT ,
 	PRIMARY KEY('feedID')
@@ -86,22 +86,31 @@ pub fn initialize() {
 }
 
 
-pub fn add_feed(url: &str) {
+pub fn add_feed(url: &str) -> Option<usize> {
     let conn = Connection::open(get_db_path()).unwrap();
     let feed = load_rss(url).unwrap();
     let new_feed = feed.clone(); 
     let time = Utc::now().to_rfc2822();
-    conn.execute(
+    match conn.execute(
         "insert into feeds(title,url,description,last_updated) values(?1,?2,?3,?4)",
         [feed.title, url.to_string(), feed.description, time],
-    )
+    ) {
-    .unwrap();
+        Ok(_) => {
+
+        }
+        Err(e) => {
+            println!("Couldn't add feed:{}\nError:{}",url,e);
+            return None;
+        }
+    }
+    
     let mut stmt = conn.prepare("select feedID from feeds where url=?1").unwrap();
     let id: usize = stmt.query_row([url],|row| {
         row.get(0)
     }).unwrap();
     //need to get the feed_id from the DB and then make sure items are mapped to feed
     store_items(new_feed,id);
+    Some(id)
 }
 
 pub fn store_items(feed: rss::Channel,feed_id: usize) {