bail!("Link should be a link to atom/rss feed, something like \"https://domain/path\".\nNot {:?}", &url);
	}
	let iv_hash = match iv_hash {
		Some(hash) => {
			if ! RE_IV_HASH.is_match(hash) {
				bail!("IV hash should be 14 hex digits.\nNot {:?}", hash);
			};
			match *hash {
				"-" => None,
				thing => Some(thing),
			}
		},
		None => None,
	};
	let url_re = match url_re {
		Some(re) => {
			let _url_rex = ReplaceCommand::new(re).context("Regexp parsing error:")?;
			match *re {
				"-" => None,
				thing => Some(thing),
			}
		},
		None => None,
	};
	let channel_id = i64::from(core.tg.send(telegram_bot::GetChat::new(telegram_bot::types::ChatRef::ChannelUsername(channel.to_string()))).await?.id());
	let chan_adm = core.tg.send(telegram_bot::GetChatAdministrators::new(telegram_bot::types::ChatRef::ChannelUsername(channel.to_string()))).await
		.context("Sorry, I have no access to that chat.")?;
	let (mut me, mut user) = (false, false);

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;

		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());

			.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)
				},

			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\\#️⃣ {} \\*️⃣ `{}` {}\n🔗 `{}`", source_id, username,  
				match enabled {
					true  => "🔄 enabled",
					false => "⛔ 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"))
	}
}