rss-tool/src/db.rs

use rusqlite::{params, Connection, Result};
use super::net::{*};


/*
Cache is the in-memory database
Any changes/updates are written to file database
*/

struct Item{
    title: String,
    content: Option<String>
}

const DB_LOCATION: &str = "rsscar.db";


const feeds_table_create: &str = "CREATE TABLE IF NOT EXISTS 'feeds' (
	'feedID'	INTEGER NOT NULL,
	'title'	TEXT NOT NULL,
	'description'	TEXT,
	'icon'	BLOB,
    'url' text not null unique on conflict ignore,
	'subscribed'	INTEGER,
	'last_updated'	TEXT ,
	PRIMARY KEY('feedID')
    );";
    
const feeds_index_create: &str = "CREATE INDEX IF NOT EXISTS  'subscribed_feeds_idx' ON 'feeds' (
	'feedID'	ASC
    ) WHERE 'subscribed' = 1;";
const items_table_create: &str = "CREATE TABLE IF NOT EXISTS 'items' (
	'itemID'	INTEGER NOT NULL,
	'title'	TEXT NOT NULL,
	'icon'	BLOB,
    'url' text not null unique on conflict ignore,
	'description'	TEXT,
	'content'	TEXT,
	'read'	INTEGER DEFAULT 0,
	PRIMARY KEY('itemID')
);";
const items_index_create: &str = "CREATE INDEX IF NOT EXISTS 'items_idx' on 'items'('itemID' ASC);";

pub fn initialize() {
    let conn = Connection::open(DB_LOCATION).unwrap();
    conn.execute(feeds_table_create,[]).unwrap();
    conn.execute(feeds_index_create,[]).unwrap();
    conn.execute(items_table_create,[]).unwrap();
    conn.execute(items_index_create,[]).unwrap();
    conn.close();
    println!("Database Initialized.")

}

pub fn add_feed(url: &str) {
    let conn = Connection::open(DB_LOCATION).unwrap();
    let feed = load_rss(url).unwrap();
    let new_feed = feed.clone();
    conn.execute("insert into feeds(title,url,description) values(?1,?2,?3)",
    [feed.title,url.to_owned(),feed.description]).unwrap();
    conn.close();
    store_items(new_feed);
}


pub fn store_items(feed: rss::Channel) {
    let conn = Connection::open(DB_LOCATION).unwrap();
    feed.items.iter().for_each(|i: &rss::Item|{
        conn.execute("insert into items(url,title,description,content) values(?1,?2,?3,?4)",[
            i.link.clone(),
            i.title.clone(),
            i.description.clone(),
            i.content.clone()]
        ).unwrap();
    });    
    conn.close();
}

pub fn return_item() -> String{
    let conn = Connection::open(DB_LOCATION).unwrap();
    let item = conn.query_row("select title,content from items where rowid=?1",[488],|row|{
        Ok(
            Item { title: row.get(0).unwrap(), content: row.get(1).unwrap() }
        )
    }).unwrap();
    match item.content {
        Some(content) => content,
        None => panic!()
    }
}

struct ReturnedFeedURLs{
    url: String
}
pub fn update_feeds() {
    //get feeds
    let conn = Connection::open(DB_LOCATION).unwrap();
    let mut stmt = conn.prepare("select url from feeds").unwrap();
    let rows = stmt.query_map([],|row| {
        Ok(ReturnedFeedURLs{
            url:row.get(0).unwrap()
        })
    }).unwrap();
    let mut urls: Vec<String> = Vec::new();
    for feed in rows{
        let url = feed.unwrap().url.clone();
        urls.push(url);
    }
    stmt.finalize();
    conn.close();

    for u in urls {
        store_items(load_rss(&u).unwrap());
    }

    
    
    //for each feed
        // insert items into database
    
    //close out
}