127 lines
4.3 KiB
Rust
127 lines
4.3 KiB
Rust
// pipeline.rs
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//
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// Copyright 2017 Jordan Petridis <jpetridis@gnome.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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// FIXME:
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//! Docs.
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use futures::{future::ok, future::lazy, prelude::*, stream::FuturesUnordered};
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use tokio;
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use hyper::client::HttpConnector;
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use hyper::{Body, Client};
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use hyper_tls::HttpsConnector;
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use crate::errors::DataError;
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use crate::Source;
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use std::iter::FromIterator;
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type HttpsClient = Client<HttpsConnector<HttpConnector>>;
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/// The pipline to be run for indexing and updating a Podcast feed that originates from
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/// `Source.uri`.
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///
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/// Messy temp diagram:
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/// Source -> GET Request -> Update Etags -> Check Status -> Parse `xml/Rss` ->
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/// Convert `rss::Channel` into `Feed` -> Index Podcast -> Index Episodes.
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pub async fn pipeline<'a, S>(mut sources: S, client: HttpsClient)
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where
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S: Stream<Item = Result<Source, DataError>> + Send + 'a + std::marker::Unpin
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{
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while let Some(source_result) = sources.next().await {
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if let Ok(source) = source_result {
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match source.into_feed(client.clone()).await {
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Ok(feed) => {
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let fut = lazy(|_| feed.index().map_err(|err| error!("Error: {}", err)));
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tokio::spawn(fut);
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},
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// Avoid spamming the stderr when it's not an actual error
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Err(DataError::FeedNotModified(_)) => (),
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Err(err) => error!("Error: {}", err),
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};
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}
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}
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}
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/// Creates a tokio `reactor::Core`, and a `hyper::Client` and
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/// runs the pipeline to completion. The `reactor::Core` is dropped afterwards.
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pub fn run<S>(sources: S) -> Result<(), DataError>
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where
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S: IntoIterator<Item = Source>,
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{
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let https = HttpsConnector::new();
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let client = Client::builder().build::<_, Body>(https);
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let foo = sources.into_iter().map(ok::<_, _>);
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let stream = FuturesUnordered::from_iter(foo);
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let p = pipeline(stream, client);
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let mut rt = tokio::runtime::Runtime::new()?;
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rt.block_on(p);
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::database::truncate_db;
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use crate::dbqueries;
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use crate::Source;
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use failure::Error;
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// (path, url) tuples.
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const URLS: &[&str] = &[
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"https://web.archive.org/web/20180120083840if_/https://feeds.feedburner.\
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com/InterceptedWithJeremyScahill",
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"https://web.archive.org/web/20180120110314if_/https://feeds.feedburner.com/linuxunplugged",
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"https://web.archive.org/web/20180120110727if_/https://rss.acast.com/thetipoff",
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"https://web.archive.org/web/20180120104957if_/https://rss.art19.com/steal-the-stars",
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"https://web.archive.org/web/20180120104741if_/https://www.greaterthancode.\
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com/feed/podcast",
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];
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#[test]
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/// Insert feeds and update/index them.
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fn test_pipeline() -> Result<(), Error> {
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truncate_db()?;
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let bad_url = "https://gitlab.gnome.org/World/podcasts.atom";
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// if a stream returns error/None it stops
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// bad we want to parse all feeds regardless if one fails
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Source::from_url(bad_url)?;
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URLS.iter().for_each(|url| {
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// Index the urls into the source table.
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Source::from_url(url).unwrap();
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});
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let sources = dbqueries::get_sources()?;
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run(sources)?;
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let sources = dbqueries::get_sources()?;
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// Run again to cover Unique constrains errors.
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run(sources)?;
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// Assert the index rows equal the controlled results
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assert_eq!(dbqueries::get_sources()?.len(), 6);
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assert_eq!(dbqueries::get_podcasts()?.len(), 5);
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assert_eq!(dbqueries::get_episodes()?.len(), 354);
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Ok(())
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}
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}
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