use anyhow::{anyhow, bail, Context, Result};
use atom_syndication;
use chrono::DateTime;
use config;
use reqwest;
use sqlx::{
postgres::PgPoolOptions,
Row,
};
use rss;
use std::{
borrow::Cow,
collections::{
BTreeMap,
HashSet,
},
sync::{Arc, Mutex},
};
use telegram_bot;
#[derive(Clone)]
pub struct Core {
owner: i64,
api_key: String,
owner_chat: telegram_bot::UserId,
pub tg: telegram_bot::Api,
pub my: telegram_bot::User,
pool: sqlx::Pool<sqlx::Postgres>,
sources: Arc<Mutex<HashSet<Arc<i32>>>>,
}
impl Core {
pub async fn new(settings: config::Config) -> Result<Core> {
let owner = settings.get_int("owner")?;
let api_key = settings.get_str("api_key")?;
let tg = telegram_bot::Api::new(&api_key);
let core = Core {
owner: owner,
api_key: api_key.clone(),
my: tg.send(telegram_bot::GetMe).await?,
tg: tg,
owner_chat: telegram_bot::UserId::new(owner),
pool: PgPoolOptions::new()
.max_connections(5)
.connect_timeout(std::time::Duration::new(300, 0))
.idle_timeout(std::time::Duration::new(60, 0))
.connect_lazy(&settings.get_str("pg")?)?,
sources: Arc::new(Mutex::new(HashSet::new())),
};
let clone = core.clone();
tokio::spawn(async move {
if let Err(err) = &clone.autofetch().await {
if let Err(err) = clone.send(&format!("š {:?}", err), None, None) {
eprintln!("Autofetch error: {}", err);
};
}
});
Ok(core)
}
pub fn stream(&self) -> telegram_bot::UpdatesStream {
self.tg.stream()
}
pub fn send<'a, S>(&self, msg: S, target: Option<telegram_bot::UserId>, parse_mode: Option<telegram_bot::types::ParseMode>) -> Result<()>
where S: Into<Cow<'a, str>> {
let msg = msg.into();
let parse_mode = match parse_mode {
Some(mode) => mode,
None => telegram_bot::types::ParseMode::Html,
};
self.tg.spawn(telegram_bot::SendMessage::new(match target {
Some(user) => user,
None => self.owner_chat,
}, msg).parse_mode(parse_mode));
Ok(())
}
pub async fn check<S>(&self, id: &i32, owner: S, real: bool) -> Result<String>
where S: Into<i64> {
let owner = owner.into();
let mut posted: i32 = 0;
let id = {
let mut set = self.sources.lock().unwrap();
match set.get(id) {
Some(id) => id.clone(),
None => {
let id = Arc::new(*id);
set.insert(id.clone());
id.clone()
},
}
};
let count = Arc::strong_count(&id);
if count == 2 {
let mut conn = self.pool.acquire().await
.with_context(|| format!("Query queue fetch conn:\n{:?}", &self.pool))?;
let row = sqlx::query("select source_id, channel_id, url, iv_hash, owner, url_re from rsstg_source where source_id = $1 and owner = $2")
.bind(*id)
.bind(owner)
.fetch_one(&mut conn).await
.with_context(|| format!("Query source:\n{:?}", &self.pool))?;
drop(conn);
let channel_id: i64 = row.try_get("channel_id")?;
let url: &str = row.try_get("url")?;
let iv_hash: Option<&str> = row.try_get("iv_hash")?;
let url_re = match row.try_get("url_re")? {
Some(x) => Some(sedregex::ReplaceCommand::new(x)?),
None => None,
};
let destination = match real {
true => telegram_bot::UserId::new(channel_id),
false => telegram_bot::UserId::new(row.try_get("owner")?),
};
let mut this_fetch: Option<DateTime<chrono::FixedOffset>> = None;
let mut posts: BTreeMap<DateTime<chrono::FixedOffset>, String> = BTreeMap::new();
let response = reqwest::get(url).await?;
let status = response.status();
let content = response.bytes().await?;
match rss::Channel::read_from(&content[..]) {
Ok(feed) => {
for item in feed.items() {
match item.link() {
Some(link) => {
let date = match item.pub_date() {
Some(feed_date) => DateTime::parse_from_rfc2822(feed_date),
None => DateTime::parse_from_rfc3339(&item.dublin_core_ext().unwrap().dates()[0]),
}?;
let url = link;
posts.insert(date.clone(), url.into());
},
None => {}
}
};
},
Err(err) => match err {
rss::Error::InvalidStartTag => {
let feed = atom_syndication::Feed::read_from(&content[..])
.with_context(|| format!("Problem opening feed url:\n{}\n{}", &url, status))?;
for item in feed.entries() {
let date = item.published().unwrap();
let url = item.links()[0].href();
posts.insert(date.clone(), url.into());
};
},
rss::Error::Eof => (),
_ => bail!("Unsupported or mangled content:\n{:?}\n{:#?}\n{:#?}\n", &url, err, status)
}
};
for (date, url) in posts.iter() {
let mut conn = self.pool.acquire().await
.with_context(|| format!("Check post fetch conn:\n{:?}", &self.pool))?;
let post_url = match url_re {
Some(ref x) => x.execute(url).to_string(),
None => url.to_string(),
};
let row = sqlx::query("select exists(select true from rsstg_post where url = $1 and source_id = $2) as exists;")
.bind(&post_url)
.bind(*id)
.fetch_one(&mut conn).await
.with_context(|| format!("Check post:\n{:?}", &conn))?;
let exists: bool = row.try_get("exists")?;
if ! exists {
if this_fetch == None || *date > this_fetch.unwrap() {
this_fetch = Some(*date);
};
self.tg.send( match iv_hash {
Some(hash) => telegram_bot::SendMessage::new(destination, format!("<a href=\"https://t.me/iv?url={}&rhash={}\"> </a>{0}", &post_url, hash)),
None => telegram_bot::SendMessage::new(destination, format!("{}", post_url)),
}.parse_mode(telegram_bot::types::ParseMode::Html)).await
.context("Can't post message:")?;
sqlx::query("insert into rsstg_post (source_id, posted, url) values ($1, $2, $3);")
.bind(*id)
.bind(date)
.bind(post_url)
.execute(&mut conn).await
.with_context(|| format!("Record post:\n{:?}", &conn))?;
drop(conn);
tokio::time::sleep(std::time::Duration::new(4, 0)).await;
};
posted += 1;
};
posts.clear();
};
let mut conn = self.pool.acquire().await
.with_context(|| format!("Update scrape fetch conn:\n{:?}", &self.pool))?;
sqlx::query("update rsstg_source set last_scrape = now() where source_id = $1;")
.bind(*id)
.execute(&mut conn).await
.with_context(|| format!("Update scrape:\n{:?}", &conn))?;
Ok(format!("Posted: {}", &posted))
}
pub async fn delete<S>(&self, source_id: &i32, owner: S) -> Result<String>
where S: Into<i64> {
let owner = owner.into();
let mut conn = self.pool.acquire().await
.with_context(|| format!("Delete fetch conn:\n{:?}", &self.pool))?;
match sqlx::query("delete from rsstg_source where source_id = $1 and owner = $2;")
.bind(source_id)
.bind(owner)
.execute(&mut conn).await
.with_context(|| format!("Delete source rule:\n{:?}", &self.pool))?
.rows_affected() {
0 => { Ok("No data found found.".to_string()) },
x => { Ok(format!("{} sources removed.", x)) },
}
}
pub async fn clean<S>(&self, source_id: &i32, owner: S) -> Result<String>
where S: Into<i64> {
let owner = owner.into();
let mut conn = self.pool.acquire().await
.with_context(|| format!("Clean fetch conn:\n{:?}", &self.pool))?;
match sqlx::query("delete from rsstg_post p using rsstg_source s where p.source_id = $1 and owner = $2 and p.source_id = s.source_id;")
.bind(source_id)
.bind(owner)
.execute(&mut conn).await
.with_context(|| format!("Clean seen posts:\n{:?}", &self.pool))?
.rows_affected() {
0 => { Ok("No data found found.".to_string()) },
x => { Ok(format!("{} posts purged.", x)) },
}
}
pub async fn enable<S>(&self, source_id: &i32, owner: S) -> Result<&str>
where S: Into<i64> {
let owner = owner.into();
let mut conn = self.pool.acquire().await
.with_context(|| format!("Enable fetch conn:\n{:?}", &self.pool))?;
match sqlx::query("update rsstg_source set enabled = true where source_id = $1 and owner = $2")
.bind(source_id)
.bind(owner)
.execute(&mut conn).await
.with_context(|| format!("Enable source:\n{:?}", &self.pool))?
.rows_affected() {
1 => { Ok("Source enabled.") },
0 => { Ok("Source not found.") },
_ => { Err(anyhow!("Database error.")) },
}
}
pub async fn disable<S>(&self, source_id: &i32, owner: S) -> Result<&str>
where S: Into<i64> {
let owner = owner.into();
let mut conn = self.pool.acquire().await
.with_context(|| format!("Disable fetch conn:\n{:?}", &self.pool))?;
match sqlx::query("update rsstg_source set enabled = false where source_id = $1 and owner = $2")
.bind(source_id)
.bind(owner)
.execute(&mut conn).await
.with_context(|| format!("Disable source:\n{:?}", &self.pool))?
.rows_affected() {
1 => { Ok("Source disabled.") },
0 => { Ok("Source not found.") },
_ => { Err(anyhow!("Database error.")) },
}
}
pub async fn update<S>(&self, update: Option<i32>, channel: &str, channel_id: i64, url: &str, iv_hash: Option<&str>, url_re: Option<&str>, owner: S) -> Result<String>
where S: Into<i64> {
let owner = owner.into();
let mut conn = self.pool.acquire().await
.with_context(|| format!("Update fetch conn:\n{:?}", &self.pool))?;
match match update {
Some(id) => {
sqlx::query("update rsstg_source set channel_id = $2, url = $3, iv_hash = $4, owner = $5, channel = $6, url_re = $7 where source_id = $1").bind(id)
},
None => {
sqlx::query("insert into rsstg_source (channel_id, url, iv_hash, owner, channel, url_re) values ($1, $2, $3, $4, $5, $6)")
},
}
.bind(channel_id)
.bind(url)
.bind(iv_hash)
.bind(owner)
.bind(channel)
.bind(url_re)
.execute(&mut conn).await {
Ok(_) => return Ok(String::from(match update {
Some(_) => "Channel updated.",
None => "Channel added.",
})),
Err(sqlx::Error::Database(err)) => {
match err.downcast::<sqlx::postgres::PgDatabaseError>().routine() {
Some("_bt_check_unique", ) => {
return Ok("Duplicate key.".to_string())
},
Some(_) => {
return Ok("Database error.".to_string())
},
None => {
return Ok("No database error extracted.".to_string())
},
};
},
Err(err) => {
bail!("Sorry, unknown error:\n{:#?}\n", err);
},
};
}
async fn autofetch(&self) -> Result<()> {
let mut delay = chrono::Duration::minutes(1);
let mut now;
loop {
let mut conn = self.pool.acquire().await
.with_context(|| format!("Autofetch fetch conn:\n{:?}", &self.pool))?;
now = chrono::Local::now();
let mut queue = sqlx::query("select source_id, next_fetch, owner from rsstg_order natural left join rsstg_source where next_fetch < now() + interval '1 minute';")
.fetch_all(&mut conn).await?;
for row in queue.iter() {
let source_id: i32 = row.try_get("source_id")?;
let owner: i64 = row.try_get("owner")?;
let next_fetch: DateTime<chrono::Local> = row.try_get("next_fetch")?;
if next_fetch < now {
let clone = Core {
owner_chat: telegram_bot::UserId::new(owner),
..self.clone()
};
tokio::spawn(async move {
if let Err(err) = clone.check(&source_id, owner, true).await {
if let Err(err) = clone.send(&format!("š {:?}", err), None, None) {
eprintln!("Check error: {}", err);
};
};
});
} else {
if next_fetch - now < delay {
delay = next_fetch - now;
}
}
};
queue.clear();
tokio::time::sleep(delay.to_std()?).await;
delay = chrono::Duration::minutes(1);
}
}
pub async fn list<S>(&self, owner: S) -> Result<String>
where S: Into<i64> {
let owner = owner.into();
let mut reply = vec![];
let mut conn = self.pool.acquire().await
.with_context(|| format!("List fetch conn:\n{:?}", &self.pool))?;
reply.push("Channels:".to_string());
let rows = sqlx::query("select source_id, channel, enabled, url, iv_hash, url_re from rsstg_source where owner = $1 order by source_id")
.bind(owner)
.fetch_all(&mut conn).await?;
for row in rows.iter() {
let source_id: i32 = row.try_get("source_id")?;
let username: &str = row.try_get("channel")?;
let enabled: bool = row.try_get("enabled")?;
let url: &str = row.try_get("url")?;
let iv_hash: Option<&str> = row.try_get("iv_hash")?;
let url_re: Option<&str> = row.try_get("url_re")?;
reply.push(format!("\n\\#ļøā£ {} \\*ļøā£ `{}` {}\nš `{}`", source_id, username,
match enabled {
true => "š enabled",
false => "ā disabled",
}, url));
if let Some(hash) = iv_hash {
reply.push(format!("IV: `{}`", hash));
}
if let Some(re) = url_re {
reply.push(format!("RE: `{}`", re));
}
};
Ok(reply.join("\n"))
}
}