Fetch feed data

fetch_all_feed_data.rs

    /// fetch_all_feed_data
    /// async fetch to get all feeds from urls
    pub fn fetch_all_feed_data(&mut self) -> Result<Vec<Channel>, Error> {
        let requests: Vec<_> = self.get_all_feed_urls()
            .into_iter()
            .take(50)
            .filter_map(|url| match url.parse::<hyper::Uri>() {
                Ok(uri) => {
                    println!("{:?}", url);
                    Some(uri)
                },
                Err(error) => {
                    println!("Error parsing URL: {:?}, {:?}", error, url);
                    None
                }
            })
            .map(|url|
                self.client.get(url)
                    .and_then(|response| response.body().concat2())
                    .and_then(move |body| {
                        let channel = Channel::read_from(body.as_ref()).unwrap_or(Channel::default());
                        Ok(channel)
                    }))
            .collect();
        self.core.run(join_all(requests))
    }