Fix CPU/memory issue + add Bot.clearCache()

This also now shuts down the unused event loop as well clears the cache

Author: Defxult

Sources/Discord/Discord.swift

@@ -352,6 +352,21 @@ public class Bot {
         }
     }
 
+    private func clearCache() {
+        dms.removeAll()
+        users.removeAll()
+        msgCacheLock.lock()
+        for messageId in Set<Snowflake>(cachedMessages.map({ $0.id })) {
+            removeCachedMessage(messageId)
+        }
+        msgCacheLock.unlock()
+        for guild in guilds {
+            guild.channelsCache.removeAll()
+            guild.membersCache.removeAll()
+        }
+        guildsCache.removeAll()
+    }
+    
     /// Create a guild. Your bot must be in less than 10 guilds to use this.
     /// - Parameters:
     ///   - name: Name of the guild.
@@ -389,12 +404,16 @@ public class Bot {
         }
     }
 
-    /// Disconnects the bot from Discord and releases the block from ``connect()``.
+    /// Disconnects the bot from Discord, releases the block from ``connect()`` and clears the cache.
     public func disconnect() {
         if let gw {
-            _ = gw.ws.close(code: .normalClosure)
+            try! gw.ws.close(code: .normalClosure).wait()
             gw.resetGatewayValues()
+            clearCache()
+            try! gw.settings.loop.syncShutdownGracefully()
             self.gw = nil
+            
+            // Must be last
             isConnected = false
         }
     }

Sources/Discord/Gateway.swift

@@ -151,7 +151,7 @@ class Gateway {
     private var heartbeatInterval = 0
     private var receivedReconnectRequest = false
 
-    private let settings = (
+    let settings = (
         port: 443,
         query: "v=10&encoding=json",
         config: WebSocketClient.Configuration(maxFrameSize: 1 << 20),
@@ -207,6 +207,11 @@ class Gateway {
         while true {
             await sleep(heartbeatInterval)
             sendHeartbeat()
+            do {
+                try Task.checkCancellation()
+            } catch {
+                return
+            }
         }
     }
 

Sources/Discord/Models/Guild.swift

@@ -146,7 +146,7 @@ public class Guild : Object, Hashable, Updateable  {
 
     /// All members in the guild.
     public var members: [Member] { [Member](membersCache.values) }
-    private var membersCache = [Snowflake: Member]()
+    var membersCache = [Snowflake: Member]()
 
     /// Total number of members in the guild.
     public internal(set) var memberCount = 0