feat: send events from gateway to bot over http

Cargo.lock

@@ -1088,6 +1088,7 @@ dependencies = [
  "lazy_static",
  "libpk",
  "metrics",
+ "reqwest 0.12.8",
  "serde_json",
  "serde_variant",
  "signal-hook",

PluralKit.Bot/Bot.cs

@@ -32,13 +32,14 @@ public class Bot
     private readonly DiscordApiClient _rest;
     private readonly RedisService _redis;
     private readonly ILifetimeScope _services;
+    private readonly RuntimeConfigService _runtimeConfig;
 
     private Timer _periodicTask; // Never read, just kept here for GC reasons
 
     public Bot(ILifetimeScope services, ILogger logger, PeriodicStatCollector collector, IMetrics metrics,
                BotConfig config, RedisService redis,
                ErrorMessageService errorMessageService, CommandMessageService commandMessageService,
-               Cluster cluster, DiscordApiClient rest, IDiscordCache cache)
+               Cluster cluster, DiscordApiClient rest, IDiscordCache cache, RuntimeConfigService runtimeConfig)
     {
         _logger = logger.ForContext<Bot>();
         _services = services;
@@ -51,6 +52,7 @@ public class Bot
         _rest = rest;
         _redis = redis;
         _cache = cache;
+        _runtimeConfig = runtimeConfig;
     }
 
     private string BotStatus => $"{(_config.Prefixes ?? BotConfig.DefaultPrefixes)[0]}help"
@@ -97,13 +99,15 @@ public class Bot
 
     private async Task OnEventReceived(int shardId, IGatewayEvent evt)
     {
+        if (_runtimeConfig.Exists("disable_events")) return;
+
         // we HandleGatewayEvent **before** getting the own user, because the own user is set in HandleGatewayEvent for ReadyEvent
         await _cache.HandleGatewayEvent(evt);
         await _cache.TryUpdateSelfMember(_config.ClientId, evt);
         await OnEventReceivedInner(shardId, evt);
     }
 
-    private async Task OnEventReceivedInner(int shardId, IGatewayEvent evt)
+    public async Task OnEventReceivedInner(int shardId, IGatewayEvent evt)
     {
         // HandleEvent takes a type parameter, automatically inferred by the event type
         // It will then look up an IEventHandler<TypeOfEvent> in the DI container and call that object's handler method

PluralKit.Bot/Services/HttpListenerService.cs

@@ -1,21 +1,26 @@
-using Serilog;
+using System.Text.Json;
 
-using Newtonsoft.Json;
+using Serilog;
 
 using WatsonWebserver.Lite;
 using WatsonWebserver.Core;
 
+using Myriad.Gateway;
+using Myriad.Serialization;
+
 namespace PluralKit.Bot;
 
 public class HttpListenerService
 {
     private readonly ILogger _logger;
     private readonly RuntimeConfigService _runtimeConfig;
+    private readonly Bot _bot;
 
-    public HttpListenerService(ILogger logger, RuntimeConfigService runtimeConfig)
+    public HttpListenerService(ILogger logger, RuntimeConfigService runtimeConfig, Bot bot)
     {
         _logger = logger.ForContext<HttpListenerService>();
         _runtimeConfig = runtimeConfig;
+        _bot = bot;
     }
 
     public void Start(string host)
@@ -26,6 +31,8 @@ public class HttpListenerService
         server.Routes.PreAuthentication.Parameter.Add(WatsonWebserver.Core.HttpMethod.POST, "/runtime_config/{key}", RuntimeConfigSet);
         server.Routes.PreAuthentication.Parameter.Add(WatsonWebserver.Core.HttpMethod.DELETE, "/runtime_config/{key}", RuntimeConfigDelete);
 
+        server.Routes.PreAuthentication.Parameter.Add(WatsonWebserver.Core.HttpMethod.POST, "/events/{shard_id}", GatewayEvent);
+
         server.Start();
     }
 
@@ -36,7 +43,7 @@ public class HttpListenerService
     {
         var config = _runtimeConfig.GetAll();
         ctx.Response.Headers.Add("content-type", "application/json");
-        await ctx.Response.Send(JsonConvert.SerializeObject(config));
+        await ctx.Response.Send(JsonSerializer.Serialize(config));
     }
 
     private async Task RuntimeConfigSet(HttpContextBase ctx)
@@ -53,4 +60,43 @@ public class HttpListenerService
         await _runtimeConfig.Delete(key);
         await RuntimeConfigGet(ctx);
     }
+
+    private JsonSerializerOptions _jsonSerializerOptions = new JsonSerializerOptions().ConfigureForMyriad();
+
+    private async Task GatewayEvent(HttpContextBase ctx)
+    {
+        var shardIdString = ctx.Request.Url.Parameters["shard_id"];
+        if (!int.TryParse(shardIdString, out var shardId)) return;
+
+        var packet = JsonSerializer.Deserialize<GatewayPacket>(ctx.Request.DataAsString, _jsonSerializerOptions);
+        var evt = DeserializeEvent(shardId, packet.EventType!, (JsonElement)packet.Payload!);
+        if (evt != null)
+        {
+            await _bot.OnEventReceivedInner(shardId, evt);
+        }
+        await ctx.Response.Send("a");
+    }
+
+    private IGatewayEvent? DeserializeEvent(int shardId, string eventType, JsonElement payload)
+    {
+        if (!IGatewayEvent.EventTypes.TryGetValue(eventType, out var clrType))
+        {
+            _logger.Debug("Shard {ShardId}: Received unknown event type {EventType}", shardId, eventType);
+            return null;
+        }
+
+        try
+        {
+            _logger.Verbose("Shard {ShardId}: Deserializing {EventType} to {ClrType}", shardId, eventType,
+                clrType);
+            return JsonSerializer.Deserialize(payload.GetRawText(), clrType, _jsonSerializerOptions)
+                as IGatewayEvent;
+        }
+        catch (JsonException e)
+        {
+            _logger.Error(e, "Shard {ShardId}: Error deserializing event {EventType} to {ClrType}", shardId,
+                eventType, clrType);
+            return null;
+        }
+    }
 }

crates/gateway/Cargo.toml

@@ -13,6 +13,7 @@ futures = { workspace = true }
 lazy_static = { workspace = true }
 libpk = { path = "../libpk" }
 metrics = { workspace = true }
+reqwest = { workspace = true }
 serde_json = { workspace = true }
 signal-hook = { workspace = true }
 tokio = { workspace = true }

crates/gateway/src/discord/gateway.rs

@@ -1,7 +1,8 @@
 use futures::StreamExt;
-use libpk::_config::ClusterSettings;
+use libpk::{_config::ClusterSettings, runtime_config::RuntimeConfig};
 use metrics::counter;
-use std::sync::{mpsc::Sender, Arc};
+use std::sync::Arc;
+use tokio::sync::mpsc::Sender;
 use tracing::{error, info, warn};
 use twilight_gateway::{
     create_iterator, ConfigBuilder, Event, EventTypeFlags, Message, Shard, ShardId,
@@ -12,7 +13,10 @@ use twilight_model::gateway::{
     Intents,
 };
 
-use crate::discord::identify_queue::{self, RedisQueue};
+use crate::{
+    discord::identify_queue::{self, RedisQueue},
+    RUNTIME_CONFIG_KEY_EVENT_TARGET,
+};
 
 use super::{cache::DiscordCache, shard_state::ShardStateManager};
 
@@ -78,13 +82,20 @@ pub fn create_shards(redis: fred::clients::RedisPool) -> anyhow::Result<Vec<Shar
 
 pub async fn runner(
     mut shard: Shard<RedisQueue>,
-    _tx: Sender<(ShardId, String)>,
+    tx: Sender<(ShardId, String)>,
     shard_state: ShardStateManager,
     cache: Arc<DiscordCache>,
+    runtime_config: Arc<RuntimeConfig>,
 ) {
     // let _span = info_span!("shard_runner", shard_id = shard.id().number()).entered();
     let shard_id = shard.id().number();
 
+    let our_user_id = libpk::config
+        .discord
+        .as_ref()
+        .expect("missing discord config")
+        .client_id;
+
     info!("waiting for events");
     while let Some(item) = shard.next().await {
         let raw_event = match item {
@@ -165,7 +176,28 @@ pub async fn runner(
         cache.0.update(&event);
 
         // okay, we've handled the event internally, let's send it to consumers
-        // tx.send((shard.id(), raw_event)).unwrap();
+
+        // some basic filtering here is useful
+        // we can't use if matching using the | operator, so anything matched does nothing
+        // and the default match skips the next block (continues to the next event)
+        match event {
+            Event::InteractionCreate(_) => {}
+            Event::MessageCreate(m) if m.author.id != our_user_id => {}
+            Event::MessageUpdate(m)
+                if let Some(author) = m.author.clone()
+                    && author.id != our_user_id
+                    && !author.bot => {}
+            Event::MessageDelete(_) => {}
+            Event::MessageDeleteBulk(_) => {}
+            Event::ReactionAdd(r) if r.user_id != our_user_id => {}
+            _ => {
+                continue;
+            }
+        }
+
+        if runtime_config.exists(RUNTIME_CONFIG_KEY_EVENT_TARGET).await {
+            tx.send((shard.id(), raw_event)).await.unwrap();
+        }
     }
 }
 

crates/gateway/src/main.rs

@@ -5,6 +5,7 @@ use chrono::Timelike;
 use discord::gateway::cluster_config;
 use fred::{clients::RedisPool, interfaces::*};
 use libpk::runtime_config::RuntimeConfig;
+use reqwest::ClientBuilder;
 use signal_hook::{
     consts::{SIGINT, SIGTERM},
     iterator::Signals,
@@ -15,7 +16,7 @@ use std::{
     vec::Vec,
 };
 use tokio::task::JoinSet;
-use tracing::{info, warn};
+use tracing::{error, info, warn};
 use twilight_gateway::{MessageSender, ShardId};
 use twilight_model::gateway::payload::outgoing::UpdatePresence;
 
@@ -23,6 +24,8 @@ mod cache_api;
 mod discord;
 mod logger;
 
+const RUNTIME_CONFIG_KEY_EVENT_TARGET: &'static str = "event_target";
+
 libpk::main!("gateway");
 async fn real_main() -> anyhow::Result<()> {
     let (shutdown_tx, shutdown_rx) = channel::<()>();
@@ -57,9 +60,40 @@ async fn real_main() -> anyhow::Result<()> {
             event_tx.clone(),
             shard_state.clone(),
             cache.clone(),
+            runtime_config.clone(),
         )));
     }
 
+    set.spawn(tokio::spawn({
+        let runtime_config = runtime_config.clone();
+        async move {
+            let client = Arc::new(ClientBuilder::new()
+                .connect_timeout(Duration::from_secs(1))
+                .timeout(Duration::from_secs(1))
+                .build()
+                .expect("error making client"));
+
+            while let Some((shard_id, event)) = event_rx.recv().await {
+                let target = runtime_config.get(RUNTIME_CONFIG_KEY_EVENT_TARGET).await;
+                if let Some(target) = target {
+                    tokio::spawn({
+                        let client = client.clone();
+                        async move {
+                            if let Err(error) = client
+                                .post(format!("{target}/{}", shard_id.number()))
+                                .body(event)
+                                .send()
+                                .await
+                            {
+                                error!(error = ?error, "failed to request event target")
+                            }
+                        }
+                    });
+                }
+            }
+        }
+    }));
+
     set.spawn(tokio::spawn(
         async move { scheduled_task(redis, senders).await },
     ));

crates/libpk/src/lib.rs

@@ -43,6 +43,7 @@ pub fn init_logging(component: &str) {
         tracing_subscriber::registry()
             .with(sentry_layer)
             .with(tracing_subscriber::fmt::layer())
+            .with(EnvFilter::from_default_env())
             .init();
     }
 }

crates/libpk/src/runtime_config.rs

@@ -33,7 +33,7 @@ impl RuntimeConfig {
             settings.insert(key, value);
         }
 
-        info!("starting with runtime config: {:?}", self.settings);
+        info!("starting with runtime config: {:?}", settings);
         Ok(())
     }
 
@@ -58,8 +58,8 @@ impl RuntimeConfig {
         Ok(())
     }
 
-    pub async fn get(&self, key: String) -> Option<String> {
-        self.settings.read().await.get(&key).cloned()
+    pub async fn get(&self, key: &str) -> Option<String> {
+        self.settings.read().await.get(key).cloned()
     }
 
     pub async fn exists(&self, key: &str) -> bool {