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|
use std::fmt;
use crate::{
error::{EntryError, PullError},
status::PullStatus,
};
use chrono::prelude::*;
use feed_rs::{
model::{Entry as ChannelEntry, Feed as Channel},
parser,
};
use serde::{Deserialize, Serialize};
use url::Url;
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Feed {
// channel url
pub link: Url,
// channel data
entries: Vec<Entry>,
// channel meta
title: String,
html_link: String,
}
impl Feed {
pub fn new(link: Url) -> Self {
Self {
link,
entries: Vec::new(),
title: String::new(),
html_link: String::new(),
}
}
pub fn total_count(&self) -> usize {
self.entries.len()
}
pub fn unread_count(&self) -> usize {
self.entries.iter().filter(|e| e.unread).count()
}
fn update_title(&mut self, channel: &Channel) -> bool {
if let Some(t) = channel.title.as_ref() {
self.title = t.content.clone();
return true;
}
false
}
fn update_html_link(&mut self, channel: &Channel) -> bool {
// update html link
if let Some(l) = channel.links.first() {
self.html_link = l.href.clone();
return true;
}
false
}
pub fn entries(&self) -> &[Entry] {
self.entries.as_slice()
}
pub async fn pull(&mut self) -> Result<PullStatus, PullError> {
let content = reqwest::get(self.link.clone()).await?.bytes().await?;
let channel = parser::parse(&content[..])?;
// update title
if !self.update_title(&channel) {
return Err(PullError::TitleUpdate);
}
// update html link
if !self.update_html_link(&channel) {
return Err(PullError::LinkUpdate);
};
// fetch new entries
let (entries, errors): (Vec<_>, Vec<_>) = channel
.entries
.iter()
.map(Entry::try_from)
.partition(Result::is_ok);
// pull status
let count = entries.len().saturating_sub(self.total_count());
let errors = errors.into_iter().map(Result::unwrap_err).collect();
let pull_status = PullStatus::new(count, errors);
// update entries
self.entries = entries.into_iter().map(Result::unwrap).collect();
Ok(pull_status)
}
}
impl fmt::Display for Feed {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.title)
}
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Entry {
pub title: String,
pub link: Url,
pub published: DateTime<Utc>,
pub unread: bool,
}
impl TryFrom<&ChannelEntry> for Entry {
type Error = EntryError;
fn try_from(e: &ChannelEntry) -> Result<Self, Self::Error> {
let title = e
.title
.as_ref()
.map(|t| t.content.clone())
.ok_or(EntryError::MissingTitle)?;
let raw_link = e
.links
.first()
.map(|l| l.href.clone())
.ok_or(EntryError::MissingLink)?;
let link = Url::parse(&raw_link).map_err(|_| EntryError::InvalidLink)?;
let published = e
.published
.or(e.updated)
.ok_or(EntryError::MissingPubDate)?;
Ok(Self {
title,
link,
published,
unread: true,
})
}
}
impl fmt::Display for Entry {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{} {} {}", self.link, self.title, self.published)
}
}
|
