Wire up enough to connect to Discord

mid-chat/src/lib.rs

@@ -16,7 +16,8 @@ pub struct ChatMessage {
     pub origin: ChatReference,
     pub author: ChatAuthor,
     pub content: ChatMessageContent,
-    // TODO: Attachments
+    pub attachments: Vec<()>,
+    pub replying: Option<ChatReference>,
 }
 
 pub mod event;

phoebe-main/Cargo.toml

@@ -9,3 +9,5 @@ tracing-subscriber = { version = "0.3.10", features = ["env-filter"] }
 color-eyre = "0.6.1"
 phoebe = { path = "../phoebe" }
 phoebe-discord = { path = "../services/phoebe-discord" }
+tracing = "0.1.33"
+futures = "0.3.21"

phoebe-main/src/main.rs

@@ -1,4 +1,5 @@
 use color_eyre::Result;
+use tracing::info;
 use tracing_subscriber::EnvFilter;
 
 use phoebe::service::Service;
@@ -12,12 +13,24 @@ async fn main() -> Result<()> {
         .with_env_filter(EnvFilter::from_default_env())
         .init();
 
-    let (tx, rx) = tokio::sync::broadcast::channel(512);
+    let (tx, _) = tokio::sync::broadcast::channel(512);
 
     let db = phoebe::open_core_db().await?;
-    let services: Vec<Box<dyn Service>> = vec![Box::new(
+    let services: Vec<Box<dyn Service + Send + Sync>> = vec![Box::new(
         phoebe_discord::setup(db.clone(), tx.clone()).await?,
     )];
 
+    let handles = services.into_iter().map(|mut srv| {
+        let mut rx = tx.subscribe();
+        tokio::spawn(async move {
+            info!("Handling events for {}…", srv.get_service_tag());
+            while let Ok(event) = rx.recv().await {
+                srv.handle_chat_event(&event).await;
+            }
+        })
+    });
+
+    let _ = futures::future::join_all(handles).await;
+
     Ok(())
 }

phoebe/src/lib.rs

@@ -1,11 +1,11 @@
-use mid_chat::event::ChatEvent;
+pub use mid_chat;
 
 pub mod db;
 pub mod prelude;
 pub mod service;
 
-pub type ChatEventSender = tokio::sync::broadcast::Sender<ChatEvent>;
-pub type ChatEventReceiver = tokio::sync::broadcast::Receiver<ChatEvent>;
+pub type ChatEventSender = tokio::sync::broadcast::Sender<mid_chat::event::ChatEvent>;
+pub type ChatEventReceiver = tokio::sync::broadcast::Receiver<mid_chat::event::ChatEvent>;
 
 pub async fn open_core_db() -> sqlx::Result<sqlx::SqlitePool> {
     let db = db::open("main").await?;

services/phoebe-discord/Cargo.toml

@@ -5,7 +5,8 @@ edition = "2021"
 
 [dependencies]
 phoebe = { path = "../../phoebe" }
-serenity = "0.10.10"
+serenity = { version = "0.10.10", default-features = false, features = ["builder", "cache", "client", "gateway", "model", "http", "utils", "rustls_backend"] }
 sqlx = { version = "0.5", features = ["runtime-tokio-native-tls", "sqlite"] }
 tracing = "0.1"
 tokio = { version = "1", features = ["full"] }
+discord_message_format = { git = "https://git.lavender.software/charlotte/discord-message-format.git" } 

services/phoebe-discord/src/chat_conv.rs

@@ -0,0 +1,86 @@
+use discord_message_format::DiscordComponent;
+use phoebe::mid_chat::{ChatContentComponent, ChatContentComponent::*, ChatMessageContent};
+
+pub fn convert(discord_message: &[DiscordComponent<'_>]) -> ChatMessageContent {
+    discord_message
+        .iter()
+        .map(discord_to_mid)
+        .collect::<ChatMessageContent>()
+}
+
+pub fn format(message_content: &[ChatContentComponent]) -> String {
+    message_content.iter().map(mid_to_discord).collect()
+}
+
+fn discord_to_mid(discord: &DiscordComponent<'_>) -> ChatContentComponent {
+    match discord {
+        DiscordComponent::Plain(text) => Plain(text.to_string()),
+        DiscordComponent::Literal(char) => Plain(char.to_string()),
+        DiscordComponent::Link(link) => Link {
+            target: link.to_string(),
+            text: vec![Plain(link.to_string())],
+        },
+
+        DiscordComponent::Bold(content) => Bold(convert(content)),
+        DiscordComponent::Italic(content) => Italic(convert(content)),
+        DiscordComponent::Strikethrough(content) => Strikethrough(convert(content)),
+        DiscordComponent::Underline(content) => Underline(convert(content)),
+
+        DiscordComponent::Code(code) => Code(code.to_string()),
+        DiscordComponent::CodeBlock { lang, source } => CodeBlock {
+            lang: lang.map(|s| s.to_string()),
+            source: source.to_string(),
+        },
+
+        DiscordComponent::Spoiler(content) => Spoiler {
+            reason: None,
+            content: convert(content),
+        },
+
+        DiscordComponent::LineBreak => HardBreak,
+        DiscordComponent::Quote(content) => BlockQuote(convert(content)),
+    }
+}
+
+fn mid_to_discord(component: &ChatContentComponent) -> String {
+    match component {
+        Plain(text) => text.to_string(), // TODO: Escape
+
+        Link { target, text } => {
+            let formatted_text = format(text);
+
+            // TODO: Maybe tolerate a missing http(s) URL scheme?
+            if &formatted_text == target {
+                formatted_text
+            } else {
+                format!("{} ({})", formatted_text, target)
+            }
+        }
+
+        Italic(inner) => format!("*{}*", format(inner)),
+        Bold(inner) => format!("**{}**", format(inner)),
+        Strikethrough(inner) => format!("~~{}~~", format(inner)),
+        Underline(inner) => format!("__{}__", format(inner)),
+
+        Code(code) => format!("`{}`", code), // TODO: Double-grave delimiting when code contains '`'
+        CodeBlock { lang, source } => {
+            format!(
+                "```{}\n{}\n```",
+                lang.as_ref()
+                    .map(|s| s.to_string())
+                    .unwrap_or_else(|| "".to_string()),
+                source.to_string()
+            )
+        }
+
+        Spoiler { content, .. } => {
+            format!("||{}||", format(content))
+        } // TODO: Spoiler reason
+
+        HardBreak => "\n".to_string(),
+        BlockQuote(inner) => format(inner)
+            .lines()
+            .map(|l| format!("> {}\n", l))
+            .collect(),
+    }
+}

services/phoebe-discord/src/handler.rs

@@ -0,0 +1,75 @@
+use phoebe::{mid_chat::*, prelude::*};
+use serenity::{
+    client::{Context, EventHandler},
+    model::prelude::*,
+};
+use tracing::debug;
+
+use crate::discord_reference;
+
+pub struct DiscordHandler {
+    pub core_db: SqlitePool,
+    pub discord_media_db: SqlitePool,
+    pub chat_event_tx: ChatEventSender,
+    pub ctx_tx: tokio::sync::mpsc::UnboundedSender<Context>,
+}
+
+impl DiscordHandler {
+    async fn get_author(&self, ctx: &Context, message: &Message) -> ChatAuthor {
+        let display_name = message
+            .author_nick(ctx)
+            .await
+            .unwrap_or_else(|| message.author.name.clone());
+
+        async fn tag_color(ctx: &Context, message: &Message) -> Option<[u8; 3]> {
+            let color = message.member(ctx).await.ok()?.colour(ctx).await?;
+            Some([color.r(), color.b(), color.g()])
+        }
+
+        let display_color = tag_color(ctx, message).await;
+
+        ChatAuthor {
+            reference: discord_reference(message.author.id),
+            display_name,
+            display_color,
+        }
+    }
+}
+
+#[async_trait]
+impl EventHandler for DiscordHandler {
+    async fn ready(&self, ctx: Context, _ready: Ready) {
+        debug!("Discord signalled ready!");
+        let _ = self.ctx_tx.send(ctx);
+    }
+
+    async fn message(&self, ctx: Context, message: Message) {
+        let origin = ChatReference {
+            service: "discord",
+            id: message.id.to_string(),
+        };
+
+        let author = self.get_author(&ctx, &message).await;
+
+        let content = discord_message_format::parse(&message.content);
+        let content = super::chat_conv::convert(&content);
+
+        let replies_to = message.referenced_message.as_ref().map(|m| ChatReference {
+            service: "discord",
+            id: m.id.to_string(),
+        });
+
+        let chat_message = ChatMessage {
+            origin,
+            author,
+            content,
+            attachments: vec![],
+            replying: replies_to,
+        };
+
+        let _ = self
+            .chat_event_tx
+            .send(ChatEvent::NewMessage(chat_message))
+            .expect("Failed to dispatch incoming Discord chat message");
+    }
+}

services/phoebe-discord/src/lib.rs

@@ -1,29 +1,19 @@
-use phoebe::prelude::*;
-use serenity::{
-    client::{Context, EventHandler},
-    model::prelude::*,
-    prelude::*,
-    Client,
-};
+use phoebe::{mid_chat, prelude::*};
+use serenity::{client::Context, Client};
 use tracing::{debug, info};
 
+mod chat_conv;
+mod handler;
+
+pub fn discord_reference(id: impl ToString) -> mid_chat::ChatReference {
+    mid_chat::ChatReference {
+        service: "discord",
+        id: id.to_string(),
+    }
+}
+
 pub struct DiscordService {
-    discord_client: Client,
-    discord_ctx: Context,
-}
-
-struct DiscordHandler {
-    core_db: SqlitePool,
-    discord_media_db: SqlitePool,
-    chat_event_tx: ChatEventSender,
-    ctx_tx: tokio::sync::mpsc::Sender<Context>,
-}
-
-#[async_trait]
-impl EventHandler for DiscordHandler {
-    async fn ready(&self, ctx: Context, _data_about_bot: Ready) {
-        let _ = self.ctx_tx.send(ctx).await;
-    }
+    pub discord_ctx: Context,
 }
 
 pub async fn setup(core_db: SqlitePool, tx: ChatEventSender) -> Result<DiscordService> {
@@ -32,9 +22,9 @@ pub async fn setup(core_db: SqlitePool, tx: ChatEventSender) -> Result<DiscordSe
     let discord_media_db = phoebe::db::open("discord_media").await?;
     sqlx::migrate!().run(&discord_media_db).await?;
 
-    let (ctx_tx, mut ctx_rx) = tokio::sync::mpsc::channel::<Context>(1);
+    let (ctx_tx, mut ctx_rx) = tokio::sync::mpsc::unbounded_channel::<Context>();
 
-    let discord_handler = DiscordHandler {
+    let discord_handler = handler::DiscordHandler {
         core_db,
         discord_media_db,
         chat_event_tx: tx,
@@ -45,17 +35,22 @@ pub async fn setup(core_db: SqlitePool, tx: ChatEventSender) -> Result<DiscordSe
     debug!("Logging in…");
     let discord_token = std::env::var("PHOEBE_DISCORD_TOKEN")
         .expect("PHOEBE_DISCORD_TOKEN environment variable was not set!");
-    let client = Client::builder(&discord_token)
+
+    let mut client = Client::builder(&discord_token)
         .event_handler(discord_handler)
         .await?;
 
+    tokio::spawn(async move {
+        client
+            .start()
+            .await
+            .expect("Failed to start Discord client")
+    });
+
     let discord_ctx = ctx_rx.recv().await.expect("Couldn't get Discord context");
     debug!("Logged in!");
 
-    Ok(DiscordService {
-        discord_client: client,
-        discord_ctx,
-    })
+    Ok(DiscordService { discord_ctx })
 }
 
 #[async_trait]