Look up linked channels in the database

We also have a Discord convenience command that lets you link to a
Matrix room as long as you have a 'Phoebe' role

src/bridgers.rs

@@ -3,6 +3,7 @@ use std::{cell::RefCell, str::FromStr, sync::Mutex};
 use sled::Db;
 
 use crate::{
+    channels::ChannelReference,
     discord::{self, forward_to_discord},
     matrix::{self, forward_to_matrix},
     messages::{MessageReference, SentMessage},
@@ -26,25 +27,85 @@ impl Bridgers {
     }
 
     fn get_linked_discord_channel(&self, source: &MessageReference) -> Option<discord::ChannelId> {
+        let discord_channels = self
+            .db
+            .open_tree("discord_channels")
+            .expect("Failed to open discord channels tree");
+
         match source {
-            MessageReference::Matrix(_room_id, _event_id) => {
-                // TODO: Look up the linked channel
-                Some(discord::ChannelId(885690775193661463))
+            MessageReference::Matrix(room_id, _) => {
+                let channel_ref = ChannelReference::Matrix(room_id.to_string());
+                let channel_ref = bincode::serialize(&channel_ref).unwrap();
+
+                discord_channels
+                    .get(channel_ref)
+                    .unwrap()
+                    .map(|bytes| bincode::deserialize::<u64>(&bytes).unwrap())
+                    .map(discord::ChannelId)
             }
             _ => None,
         }
     }
 
     fn get_linked_matrix_room(&self, source: &MessageReference) -> Option<matrix::RoomId> {
+        let matrix_channels = self
+            .db
+            .open_tree("matrix_channels")
+            .expect("Failed to open matrix channels tree");
+
         match source {
-            MessageReference::Discord(_, _) => {
-                // TODO: Look up the linked channel
-                Some(matrix::RoomId::from_str("!SjQatGOikRshcWNcln:matrix.org").unwrap())
+            MessageReference::Discord(channel_id, _) => {
+                let channel_ref = ChannelReference::Discord(*channel_id);
+                let channel_ref = bincode::serialize(&channel_ref).unwrap();
+
+                matrix_channels
+                    .get(channel_ref)
+                    .unwrap()
+                    .map(|bytes| bincode::deserialize::<String>(&bytes).unwrap())
+                    .as_deref()
+                    .map(matrix::RoomId::from_str)
+                    .map(Result::unwrap)
             }
             _ => None,
         }
     }
 
+    pub fn link_channels(&self, channels: &[ChannelReference]) {
+        let discord_channels = self
+            .db
+            .open_tree("discord_channels")
+            .expect("Failed to open discord channels tree");
+
+        let matrix_channels = self
+            .db
+            .open_tree("matrix_channels")
+            .expect("Failed to open matrix channels tree");
+
+        for channel in channels.iter() {
+            let other_channels = channels
+                .iter()
+                .filter(|r| r != &channel)
+                .collect::<Vec<_>>();
+
+            match channel {
+                ChannelReference::Discord(channel_id) => {
+                    for other_channel in other_channels {
+                        let key = bincode::serialize(other_channel).unwrap();
+                        let value = bincode::serialize(channel_id).unwrap();
+                        discord_channels.insert(key, value).unwrap();
+                    }
+                }
+                ChannelReference::Matrix(room_id) => {
+                    for other_channel in other_channels {
+                        let key = bincode::serialize(other_channel).unwrap();
+                        let value = bincode::serialize(room_id.as_str()).unwrap();
+                        matrix_channels.insert(key, value).unwrap();
+                    }
+                }
+            }
+        }
+    }
+
     pub async fn send_message(&self, message: SentMessage) -> Vec<MessageReference> {
         let mut related_messages = vec![message.source.clone()];
 
@@ -64,17 +125,17 @@ impl Bridgers {
             }
         }
 
+        let tree = self
+            .db
+            .open_tree("message_relations")
+            .expect("Failed to open relations tree");
+
         for source in related_messages.iter() {
             let relations = related_messages
                 .iter()
                 .filter(|r| r != &source)
                 .collect::<Vec<_>>();
 
-            let tree = self
-                .db
-                .open_tree("message_relations")
-                .expect("Failed to open relations tree");
-
             tree.insert(
                 bincode::serialize(source).expect("Failed to serialize message reference"),
                 bincode::serialize(&relations).expect("Failed to serialize message relations"),

src/channels.rs

@@ -0,0 +1,7 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Deserialize, Serialize, Clone, PartialEq)]
+pub enum ChannelReference {
+    Discord(u64),
+    Matrix(String),
+}

src/discord.rs

@@ -3,6 +3,7 @@ use serenity::{async_trait, model::prelude::*, prelude::*};
 use tokio::sync::mpsc;
 
 use crate::{
+    channels::ChannelReference,
     message_ast::{self, format_discord},
     messages::{MessageAuthor, MessageEvent, MessageReference, SentMessage},
 };
@@ -18,7 +19,7 @@ impl From<&Message> for MessageReference {
 
 struct DiscordHandler {
     ctx_tx: mpsc::UnboundedSender<Context>,
-    message_tx: mpsc::UnboundedSender<MessageEvent>,
+    event_tx: mpsc::UnboundedSender<MessageEvent>,
 }
 
 #[async_trait]
@@ -35,12 +36,33 @@ impl EventHandler for DiscordHandler {
             return;
         }
 
+        if let Some(target) = message.content.strip_prefix("phoebe!link ") {
+            if message
+                .member(&ctx)
+                .await
+                .unwrap()
+                .roles(&ctx)
+                .await
+                .unwrap()
+                .iter()
+                .any(|r| r.name == "Phoebe")
+            {
+                let _ = self.event_tx.send(MessageEvent::AdminLinkChannels(vec![
+                    ChannelReference::Discord(message.channel_id.0),
+                    ChannelReference::Matrix(target.to_string()),
+                ]));
+
+                message.reply(&ctx, "Linking with matrix.").await.unwrap();
+                return;
+            }
+        }
+
         let message_ref = MessageReference::from(&message);
 
         let content = discord_message_format::parse(&message.content);
         let content = message_ast::convert_discord(&content);
 
-        let _ = self.message_tx.send(MessageEvent::Send(SentMessage {
+        let _ = self.event_tx.send(MessageEvent::Send(SentMessage {
             source: message_ref,
             content,
             author: MessageAuthor {
@@ -73,7 +95,10 @@ pub async fn create_discord_client(
     message_tx: mpsc::UnboundedSender<MessageEvent>,
     token: &str,
 ) -> Client {
-    let handler = DiscordHandler { ctx_tx, message_tx };
+    let handler = DiscordHandler {
+        ctx_tx,
+        event_tx: message_tx,
+    };
 
     info!("Discord logging in…");
     let client = Client::builder(token)

src/main.rs

@@ -4,6 +4,7 @@ use discord::create_discord_client;
 use matrix::create_matrix_client;
 
 mod bridgers;
+mod channels;
 mod message_ast;
 mod messages;
 
@@ -89,9 +90,12 @@ async fn main() {
             MessageEvent::Send(sent_message) => {
                 let _ = bridgers.send_message(sent_message).await;
             }
-            MessageEvent::Edit(edited_message) => {
+            MessageEvent::Edit(_edited_message) => {
                 todo!();
             }
+            MessageEvent::AdminLinkChannels(channels) => {
+                bridgers.link_channels(&channels);
+            }
         }
     }
 }

src/messages.rs

@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
-use crate::message_ast::MessageContent;
+use crate::{channels::ChannelReference, message_ast::MessageContent};
 
 #[derive(Serialize, Deserialize, Clone, PartialEq, Eq)]
 pub enum MessageReference {
@@ -25,6 +25,7 @@ pub struct EditedMessage {
 }
 
 pub enum MessageEvent {
+    AdminLinkChannels(Vec<ChannelReference>),
     Send(SentMessage),
     Edit(EditedMessage),
 }