db, add channel and feed; user.get_feeds

Adds the primary functionality for channel and feed

Also adds a function to user to get the feeds associated with a user.

koucha/src/db/channel.rs

@@ -0,0 +1,179 @@
+use reqwest::Url;
+use chrono::{DateTime, Utc};
+use crate::{
+  Result,
+  AdapterPool,
+  db::ChannelKey,
+};
+
+pub struct UnparsedChannel {
+  pub id: i64,
+  pub title: String,
+  pub link: String,
+  pub description: Option<String>,
+  pub last_fetched: Option<String>,
+}
+impl UnparsedChannel {
+  pub fn parse(self) -> Result<Channel> {
+    Ok(Channel {
+      key: ChannelKey(self.id),
+      title: self.title,
+      link: Url::parse(&self.link)?,
+      description: self.description,
+      last_fetched: self.last_fetched.as_deref()
+        .map(DateTime::parse_from_rfc2822)
+        .transpose()?
+        .map(|dt| dt.with_timezone(&Utc)),
+    })
+  }
+}
+
+pub struct Channel {
+  key: ChannelKey,
+  title: String,
+  link: Url,
+  description: Option<String>,
+  last_fetched: Option<DateTime<Utc>>,
+}
+
+impl Channel {
+  pub fn key(&self) -> ChannelKey { self.key }
+  pub fn title(&self) -> &str { &self.title }
+  pub fn link(&self) -> &Url { &self.link }
+  pub fn description(&self) -> Option<&str> { self.description.as_deref() }
+  pub fn last_fetched(&self) -> Option<DateTime<Utc>> { self.last_fetched }
+
+  pub async fn get_all(pool: &AdapterPool) -> Result<Vec<Self>> {
+    sqlx::query_as!(
+      UnparsedChannel,
+      "SELECT id, title, link, description, last_fetched FROM channels"
+    ).fetch_all(&pool.0).await?.into_iter().map(UnparsedChannel::parse).collect()
+  }
+
+  pub async fn get(pool: &AdapterPool, key: ChannelKey) -> Result<Self> {
+    sqlx::query_as!(
+      UnparsedChannel,
+      "SELECT id, title, link, description, last_fetched
+       FROM channels
+       WHERE id = ?",
+      key.0
+    ).fetch_one(&pool.0).await?.parse()
+  }
+
+  pub async fn get_or_create(
+    pool: &AdapterPool, link: Url
+  ) -> Result<Self> {
+    let link_str = link.as_str();
+
+    sqlx::query_as!(
+      UnparsedChannel,
+      "INSERT INTO channels (title, link)
+       VALUES(?, ?)
+       ON CONFLICT(link) DO UPDATE SET link = link
+       RETURNING id, title, link, description, last_fetched",
+      link_str, link_str // We use the url as a placeholder title
+    ).fetch_one(&pool.0).await?.parse()
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use crate::{
+    test_utils::{
+      FEED1, FEED2, CHANNEL_TITLE, CHANNEL_DESC,
+      setup_adapter,
+      setup_channel,
+    },
+  };
+  use chrono::TimeZone;
+
+  #[test]
+  fn parse_unparsed_item() {
+    const CHANNEL_ID: i64 = 1;
+    let date: DateTime<Utc> = Utc.with_ymd_and_hms(2020,1,1,0,0,0).unwrap();
+
+    let raw_channel = UnparsedChannel {
+      id: CHANNEL_ID,
+      title: CHANNEL_TITLE.to_string(),
+      link: FEED1.to_string(),
+      description: Some(CHANNEL_DESC.to_string()),
+      last_fetched: Some(date.to_rfc2822()),
+    };
+    let channel = raw_channel.parse().unwrap();
+    
+    assert_eq!(channel.key.0, CHANNEL_ID);
+    assert_eq!(channel.title, CHANNEL_TITLE);
+    assert_eq!(channel.link.as_str(), FEED1);
+    assert_eq!(channel.description, Some(CHANNEL_DESC.to_string()));
+    assert_eq!(channel.last_fetched, Some(date));
+  }
+
+  #[tokio::test]
+  async fn get_all() {
+    let adapter = setup_adapter().await;
+    let pool = adapter.get_pool();
+    let url1 = Url::parse(FEED1).unwrap();
+    let url2 = Url::parse(FEED2).unwrap();
+    Channel::get_or_create(pool, url1).await.unwrap();
+    Channel::get_or_create(pool, url2).await.unwrap();
+
+    let channels = Channel::get_all(pool).await.unwrap();
+    assert_eq!(channels.len(), 2);
+  }
+
+  #[tokio::test]
+  async fn get() {
+    let adapter = setup_adapter().await;
+    let pool = adapter.get_pool();
+    let channel_a = setup_channel(pool).await;
+
+    let channel_b = Channel::get(pool, channel_a.key()).await.unwrap();
+
+    assert_eq!(channel_a.key, channel_b.key);
+    assert_eq!(channel_a.title, channel_b.title);
+    assert_eq!(channel_a.link, channel_b.link);
+    assert_eq!(channel_a.last_fetched, channel_b.last_fetched);
+    assert_eq!(channel_a.description, channel_b.description);
+  }
+
+  #[tokio::test]
+  async fn create() {
+    let adapter = setup_adapter().await;
+    let pool = adapter.get_pool();
+    let url_feed = Url::parse(FEED1).unwrap();
+
+    let channel = Channel::get_or_create(pool, url_feed).await.unwrap();
+
+    assert!(channel.key().0 > 0);
+    assert_eq!(channel.link().as_str(), FEED1);
+    assert!(channel.title().len() > 0);
+  }
+
+  #[tokio::test]
+  async fn create_duplicate_returns_existing() {
+    let adapter = setup_adapter().await;
+    let pool = adapter.get_pool();
+    let url_feed = Url::parse(FEED1).unwrap();
+
+    let channel1 = Channel::get_or_create(pool, url_feed.clone()).await.unwrap();
+    let channel2 = Channel::get_or_create(pool, url_feed).await.unwrap();
+
+    assert_eq!(channel1.key(), channel2.key());
+  }
+
+  #[tokio::test]
+  async fn get_all_channels() {
+    let adapter = setup_adapter().await;
+    let pool = adapter.get_pool();
+    let url_feed1 = Url::parse(FEED1).unwrap();
+    let url_feed2 = Url::parse(FEED2).unwrap();
+
+    Channel::get_or_create(pool, url_feed1).await.unwrap();
+    Channel::get_or_create(pool, url_feed2).await.unwrap();
+
+    let channels = Channel::get_all(pool).await.unwrap();
+
+    assert_eq!(channels.len(), 2);
+  }
+}