Setup command framework and add /start command

Cargo.toml

@@ -6,6 +6,8 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.86"
 diesel = { version = "2.2.1", features = ["postgres"] }
+log = "0.4.22"
 micronfig = "0.3.0"
-teloxide = "0.12.2"
-tokio = { version = "1.38.0", features = ["full", "macros"] }
+pretty_env_logger = "0.5.0"
+teloxide = { version = "0.12.2", features = ["full"] }
+tokio = { version = "1.38.0", features = ["full"] }

src/main.rs

@@ -1,35 +1,22 @@
 use anyhow::{Context, Result};
+use teloxide::dispatching::HandlerExt;
 
-mod database;
+pub(crate) mod database;
 mod telegram;
 
 #[tokio::main]
 async fn main() -> Result<()> {
-    let mut tg = telegram::connect();
-
-    teloxide::repl(tg, |tg: teloxide::Bot, msg: teloxide::types::Message| async move {
-        use teloxide::prelude::*;
-
-        let mut db = database::connect()
-            .expect("Failed to connect to the database");
-
-        let whoami = {
-            use diesel::prelude::*;
-            use database::schema::telegram::dsl::*;
-            use database::models::*;
-            telegram
-                .filter(telegram_id.eq(msg.chat.id.0))
-                .limit(1)
-                .select(TelegramUser::as_select())
-                .load(&mut db)
-                .expect("Failed to query")
-                .pop()
-                .expect("Failed to get object")
-        };
-
-        tg.send_message(msg.chat.id, format!("{whoami:?}")).await?;
-        Ok(())
-    }).await;
+    // Logging setup
+    {
+        pretty_env_logger::init();
+        log::info!("Logging initialized successfully!");
+    }
+    // Telegram setup
+    {
+        log::trace!("Setting up Telegram bot...");
+        let mut dispatcher = telegram::dispatcher();
+        dispatcher.dispatch().await
+    }
 
     Ok(())
 }

src/telegram/commands/mod.rs

@@ -0,0 +1,53 @@
+use anyhow::Error;
+use diesel::PgConnection;
+use teloxide::{Bot, dptree};
+use teloxide::dispatching::{DefaultKey, Dispatcher, HandlerExt, UpdateFilterExt};
+use teloxide::dispatching::dialogue::{InMemStorage, TraceStorage};
+use teloxide::types::{Message, Update};
+use teloxide::utils::command::BotCommands;
+
+mod start;
+
+#[derive(Debug, Clone, Default)]
+enum State {
+	#[default]
+	Default,
+}
+
+type Dialogue = teloxide::dispatching::dialogue::Dialogue<State, TraceStorage<InMemStorage<State>>>;
+type Result = anyhow::Result<()>;
+
+async fn detect_command(bot: Bot, dialogue: Dialogue, message: Message) -> Result {
+	let text = message.text();
+	if text.is_none() {
+		// Ignore non-textual messages
+		return Ok(())
+	}
+	let text = text.unwrap();
+
+	match text {
+		"/start" => start::handler(bot, dialogue, message).await,
+		_ => anyhow::bail!("Unknown command"),
+	}
+}
+
+pub(super) fn dispatcher(bot: Bot) -> Dispatcher<Bot, Error, DefaultKey> {
+	Dispatcher::builder(
+		bot,
+		Update::filter_message()
+			.enter_dialogue::<Message, TraceStorage<InMemStorage<State>>, State>()
+			.branch(
+				dptree::case![State::Default]
+					.endpoint(detect_command)
+			)
+	)
+		.dependencies(
+			dptree::deps![
+				TraceStorage::new(
+					InMemStorage::<State>::new()
+				)
+			]
+		)
+		.enable_ctrlc_handler()
+		.build()
+}

src/telegram/commands/start.rs

@@ -0,0 +1,42 @@
+use anyhow::Context;
+use teloxide::Bot;
+use teloxide::payloads::SendMessageSetters;
+use teloxide::requests::Requester;
+use teloxide::types::{Message};
+use super::{Dialogue, Result};
+
+pub(super) async fn handler(bot: Bot, _dialogue: Dialogue, message: Message) -> Result {
+	let author = message.from()
+		.context("Failed to get the user who sent the original message")?;
+
+	let author_username = match author.username.as_ref() {
+		None => {
+			format!("{}", &author.first_name)
+		},
+		Some(username) => {
+			format!("@{}", &username)
+		},
+	};
+
+	let me = bot
+		.get_me()
+		.await
+		.context("Failed to get information about self")?;
+
+	let me_username = me.username.as_ref()
+		.context("Failed to get bot's username")?;
+
+	let text = format!(
+		"👋 Ciao {author_username}! Sono @{me_username}, il robot tuttofare della RYG!\n\n\
+		Puoi vedere l'elenco delle mie funzionalità dal menu in basso.\n\n\
+		Cosa posso fare per te oggi?"
+	);
+
+	let _reply = bot
+		.send_message(message.chat.id, text)
+		.reply_to_message_id(message.id)
+		.await
+		.context("Failed to send message")?;
+
+	Ok(())
+}

src/telegram/mod.rs

@@ -1,7 +1,14 @@
+use anyhow::Error;
 use teloxide::Bot;
+use teloxide::dispatching::{DefaultKey, Dispatcher};
 
 mod config;
+mod commands;
 
-pub fn connect() -> Bot {
-	Bot::new(config::TELEGRAM_BOT_TOKEN())
+pub fn dispatcher() -> Dispatcher<Bot, Error, DefaultKey> {
+	commands::dispatcher(
+		Bot::new(
+			config::TELEGRAM_BOT_TOKEN()
+		)
+	)
 }