Lines of
src/core.rs
from check-in d7fbc271ac
that are changed by the sequence of edits moving toward
check-in b23050a4ea:
1: use crate::{
2: command,
3: sql::Db,
4: };
5:
6: use std::{
7: borrow::Cow,
8: collections::{
9: BTreeMap,
10: HashSet,
11: },
12: sync::Arc,
13: };
14:
15: use async_compat::Compat;
16: use chrono::{
17: DateTime,
18: Local,
19: };
20: use lazy_static::lazy_static;
21: use regex::Regex;
22: use reqwest::header::{
23: CACHE_CONTROL,
24: EXPIRES,
25: LAST_MODIFIED
26: };
27: use smol::{
28: Timer,
29: lock::Mutex,
30: };
31: use tgbot::{
32: api::Client,
33: handler::UpdateHandler,
34: types::{
35: Bot,
36: ChatPeerId,
37: Command,
38: GetBot,
39: Message,
40: ParseMode,
41: SendMessage,
42: Update,
43: UpdateType,
44: UserPeerId,
45: },
46: };
47: use stacked_errors::{
48: Result,
49: StackableErr,
50: anyhow,
51: bail,
52: };
53:
54: lazy_static!{
55: pub static ref RE_SPECIAL: Regex = Regex::new(r"([\-_*\[\]()~`>#+|{}\.!])").unwrap();
56: }
57:
58: /// Encodes special HTML entities to prevent them interfering with Telegram HTML
59: pub fn encode (text: &str) -> Cow<'_, str> {
60: RE_SPECIAL.replace_all(text, "\\$1")
61: }
62:
63: // This one does nothing except making sure only one token exists for each id
64: pub struct Token {
65: running: Arc<Mutex<HashSet<i32>>>,
66: my_id: i32,
67: }
68:
69: impl Token {
d7fbc271ac 2026-01-06 70: fn new (running: &Arc<Mutex<HashSet<i32>>>, my_id: i32) -> Option<Token> {
71: let running = running.clone();
d7fbc271ac 2026-01-06 72: smol::block_on(async {
d7fbc271ac 2026-01-06 73: let mut set = running.lock_arc().await;
d7fbc271ac 2026-01-06 74: if set.contains(&my_id) {
d7fbc271ac 2026-01-06 75: None
d7fbc271ac 2026-01-06 76: } else {
d7fbc271ac 2026-01-06 77: set.insert(my_id);
d7fbc271ac 2026-01-06 78: Some(Token {
d7fbc271ac 2026-01-06 79: running,
d7fbc271ac 2026-01-06 80: my_id,
d7fbc271ac 2026-01-06 81: })
d7fbc271ac 2026-01-06 82: }
d7fbc271ac 2026-01-06 83: })
84: }
85: }
86:
87: impl Drop for Token {
88: fn drop (&mut self) {
89: smol::block_on(async {
90: let mut set = self.running.lock_arc().await;
91: set.remove(&self.my_id);
92: })
93: }
94: }
95:
96: #[derive(Clone)]
97: pub struct Core {
98: owner_chat: ChatPeerId,
99: // max_delay: u16,
100: pub tg: Client,
101: pub me: Bot,
102: pub db: Db,
103: running: Arc<Mutex<HashSet<i32>>>,
104: http_client: reqwest::Client,
105: }
106:
107: pub struct Post {
108: uri: String,
109: title: String,
110: authors: String,
111: summary: String,
112: }
113:
114: impl Core {
115: pub async fn new(settings: config::Config) -> Result<Core> {
116: let owner_chat = ChatPeerId::from(settings.get_int("owner").stack()?);
117: let api_key = settings.get_string("api_key").stack()?;
118: let tg = Client::new(&api_key).stack()?
119: .with_host(settings.get_string("api_gateway").stack()?);
120:
121: let mut client = reqwest::Client::builder();
122: if let Ok(proxy) = settings.get_string("proxy") {
123: let proxy = reqwest::Proxy::all(proxy).stack()?;
124: client = client.proxy(proxy);
125: }
126: let http_client = client.build().stack()?;
127: let me = tg.execute(GetBot).await.stack()?;
128: let core = Core {
129: tg,
130: me,
131: owner_chat,
132: db: Db::new(&settings.get_string("pg").stack()?)?,
133: running: Arc::new(Mutex::new(HashSet::new())),
134: http_client,
135: // max_delay: 60,
136: };
137: let clone = core.clone();
138: smol::spawn(Compat::new(async move {
139: loop {
140: let delay = match &clone.autofetch().await {
141: Err(err) => {
142: if let Err(err) = clone.send(format!("🛑 {err}"), None, None).await {
143: eprintln!("Autofetch error: {err:?}");
144: };
145: std::time::Duration::from_secs(60)
146: },
147: Ok(time) => *time,
148: };
149: Timer::after(delay).await;
150: }
151: })).detach();
152: Ok(core)
153: }
154:
155: pub async fn send <S>(&self, msg: S, target: Option<ChatPeerId>, mode: Option<ParseMode>) -> Result<Message>
156: where S: Into<String> {
157: let msg = msg.into();
158:
159: let mode = mode.unwrap_or(ParseMode::Html);
160: let target = target.unwrap_or(self.owner_chat);
161: self.tg.execute(
162: SendMessage::new(target, msg)
163: .with_parse_mode(mode)
164: ).await.stack()
165: }
166:
167: pub async fn check (&self, id: i32, real: bool, last_scrape: Option<DateTime<Local>>) -> Result<String> {
168: let mut posted: i32 = 0;
169: let mut conn = self.db.begin().await.stack()?;
170:
d7fbc271ac 2026-01-06 171: let token = Token::new(&self.running, id);
d7fbc271ac 2026-01-06 172: if token.is_none() {
d7fbc271ac 2026-01-06 173: bail!("check is already running");
d7fbc271ac 2026-01-06 174: }
175: let source = conn.get_source(id, self.owner_chat).await.stack()?;
176: conn.set_scrape(id).await.stack()?;
177: let destination = ChatPeerId::from(match real {
178: true => source.channel_id,
179: false => source.owner,
180: });
181: let mut this_fetch: Option<DateTime<chrono::FixedOffset>> = None;
182: let mut posts: BTreeMap<DateTime<chrono::FixedOffset>, Post> = BTreeMap::new();
183:
184: let mut builder = self.http_client.get(&source.url);
185: if let Some(last_scrape) = last_scrape {
186: builder = builder.header(LAST_MODIFIED, last_scrape.to_rfc2822());
187: };
188: let response = builder.send().await.stack()?;
189: {
190: let headers = response.headers();
191: let expires = headers.get(EXPIRES);
192: let cache = headers.get(CACHE_CONTROL);
193: if expires.is_some() || cache.is_some() {
194: println!("{} {} {:?} {:?} {:?}", Local::now().to_rfc2822(), &source.url, last_scrape, expires, cache);
195: }
196: }
197: let status = response.status();
198: let content = response.bytes().await.stack()?;
199: match rss::Channel::read_from(&content[..]) {
200: Ok(feed) => {
201: for item in feed.items() {
202: if let Some(link) = item.link() {
203: let date = match item.pub_date() {
204: Some(feed_date) => DateTime::parse_from_rfc2822(feed_date),
205: None => DateTime::parse_from_rfc3339(match item.dublin_core_ext() {
206: Some(dates) => &dates.dates()[0],
207: None => bail!("Feed item misses posting date."),
208: }),
209: }.stack()?;
210: let uri = link.to_string();
211: let title = item.title().unwrap_or("").to_string();
212: let authors = item.author().unwrap_or("").to_string();
213: let summary = item.content().unwrap_or("").to_string();
214: posts.insert(date, Post{
215: uri,
216: title,
217: authors,
218: summary,
219: });
220: }
221: };
222: },
223: Err(err) => match err {
224: rss::Error::InvalidStartTag => {
225: match atom_syndication::Feed::read_from(&content[..]) {
226: Ok(feed) => {
227: for item in feed.entries() {
228: let date = item.published().unwrap();
229: let uri = item.links()[0].href().to_string();
230: let title = item.title().to_string();
231: let authors = item.authors().iter().map(|x| format!("{} <{:?}>", x.name(), x.email())).collect::<Vec<String>>().join(", ");
232: let summary = if let Some(sum) = item.summary() { sum.value.clone() } else { String::new() };
233: posts.insert(*date, Post{
234: uri,
235: title,
236: authors,
237: summary,
238: });
239: };
240: },
241: Err(err) => {
242: bail!("Unsupported or mangled content:\n{:?}\n{err}\n{status:#?}\n", &source.url)
243: },
244: }
245: },
246: rss::Error::Eof => (),
247: _ => bail!("Unsupported or mangled content:\n{:?}\n{err}\n{status:#?}\n", &source.url)
248: }
249: };
250: for (date, post) in posts.iter() {
251: let post_url: Cow<str> = match source.url_re {
252: Some(ref x) => sedregex::ReplaceCommand::new(x).stack()?.execute(&post.uri),
253: None => post.uri.clone().into(),
254: };
255: if let Some(exists) = conn.exists(&post_url, id).await.stack()? {
256: if ! exists {
257: if this_fetch.is_none() || *date > this_fetch.unwrap() {
258: this_fetch = Some(*date);
259: };
260: self.send( match &source.iv_hash {
261: Some(hash) => format!("<a href=\"https://t.me/iv?url={post_url}&rhash={hash}\"> </a>{post_url}"),
262: None => format!("{post_url}"),
263: }, Some(destination), Some(ParseMode::Html)).await.stack()?;
264: conn.add_post(id, date, &post_url).await.stack()?;
265: };
266: };
267: posted += 1;
268: };
269: posts.clear();
270: Ok(format!("Posted: {posted}"))
271: }
272:
273: async fn autofetch(&self) -> Result<std::time::Duration> {
274: let mut delay = chrono::Duration::minutes(1);
275: let now = chrono::Local::now();
276: let queue = {
277: let mut conn = self.db.begin().await.stack()?;
278: conn.get_queue().await.stack()?
279: };
280: for row in queue {
281: if let Some(next_fetch) = row.next_fetch {
282: if next_fetch < now {
283: if let (Some(owner), Some(source_id), last_scrape) = (row.owner, row.source_id, row.last_scrape) {
284: let clone = Core {
285: owner_chat: ChatPeerId::from(owner),
286: ..self.clone()
287: };
288: let source = {
289: let mut conn = self.db.begin().await.stack()?;
290: match conn.get_one(owner, source_id).await {
291: Ok(Some(source)) => source.to_string(),
292: Ok(None) => "Source not found in database?".to_string(),
293: Err(err) => format!("Failed to fetch source data:\n{err}"),
294: }
295: };
296: smol::spawn(Compat::new(async move {
297: if let Err(err) = clone.check(source_id, true, Some(last_scrape)).await {
298: if let Err(err) = clone.send(&format!("🛑 {source}\n{}", encode(&err.to_string())), None, Some(ParseMode::MarkdownV2)).await {
299: eprintln!("Check error: {err}");
300: // clone.disable(&source_id, owner).await.unwrap();
301: };
302: };
303: })).detach();
304: }
305: } else if next_fetch - now < delay {
306: delay = next_fetch - now;
307: }
308: }
309: };
310: delay.to_std().stack()
311: }
312:
313: pub async fn list (&self, owner: UserPeerId) -> Result<String> {
314: let mut reply: Vec<String> = vec![];
315: reply.push("Channels:".into());
316: let mut conn = self.db.begin().await.stack()?;
317: for row in conn.get_list(owner).await.stack()? {
318: reply.push(row.to_string());
319: };
320: Ok(reply.join("\n\n"))
321: }
322: }
323:
324: impl UpdateHandler for Core {
325: async fn handle (&self, update: Update) {
326: if let UpdateType::Message(msg) = update.update_type {
327: if let Ok(cmd) = Command::try_from(msg) {
328: let msg = cmd.get_message();
329: let words = cmd.get_args();
330: let command = cmd.get_name();
331: let res = match command {
332: "/check" | "/clean" | "/enable" | "/delete" | "/disable" => command::command(self, command, msg, words).await,
333: "/start" => command::start(self, msg).await,
334: "/list" => command::list(self, msg).await,
335: "/add" | "/update" => command::update(self, command, msg, words).await,
336: any => Err(anyhow!("Unknown command: {any}")),
337: };
338: if let Err(err) = res {
339: if let Err(err2) = self.send(format!("\\#error\n```\n{err}\n```"),
340: Some(msg.chat.get_id()),
341: Some(ParseMode::MarkdownV2)
342: ).await{
343: dbg!(err2);
344: };
345: }
346: };
347: };
348: }
349: }