Add type-safe wrapper around Rpc methods

src/EscapeMenuAppearance.cs

@@ -20,8 +20,8 @@ public class EscapeMenuAppearance : CenterContainer
         ColorSlider.Value = GD.Randf();
         ColorPreview.Modulate = Color.FromHsv((float)ColorSlider.Value, 1.0F, 1.0F);
 
-        this.GetClient().LocalPlayerSpawned += (player) => player.RpcId(1,
-            nameof(Player.ChangeAppearance), DisplayName.Text, ColorPreview.Modulate);
+        this.GetClient().LocalPlayerSpawned += (player)
+            => RPC.Reliable(1, player.ChangeAppearance, DisplayName.Text, ColorPreview.Modulate);
     }
 
     #pragma warning disable IDE0051
@@ -49,7 +49,6 @@ public class EscapeMenuAppearance : CenterContainer
         if (IsVisibleInTree()) return;
         var client = this.GetClient();
         if (client.Status == NetworkedMultiplayerPeer.ConnectionStatus.Connected)
-            client.LocalPlayer.RpcId(1, nameof(Player.ChangeAppearance),
-                                     DisplayName.Text, ColorPreview.Modulate);
+            RPC.Reliable(1, client.LocalPlayer.ChangeAppearance, DisplayName.Text, ColorPreview.Modulate);
     }
 }

src/EscapeMenuWorld.cs

@@ -105,6 +105,7 @@ public class EscapeMenuWorld : CenterContainer
 
         // Reset players' positions.
         foreach (var player in server.GetWorld().Players)
+            // Can't use RPC helper method here since player is not a LocalPlayer here.
             player.RpcId(player.NetworkID, nameof(LocalPlayer.ResetPosition), Vector2.Zero);
 
         save.ReadDataIntoWorld(server.GetWorld());

src/IO/WorldSave.cs

@@ -75,8 +75,8 @@ public class WorldSave
 
     public void ReadDataIntoWorld(World world)
     {
-        world.Rpc(nameof(World.ClearBlocks));
+        RPC.Reliable(world.ClearBlocks);
         foreach (var (position, color, unbreakable) in Blocks)
-            world.Rpc(nameof(World.SpawnBlock), position.X, position.Y, color, unbreakable);
+            RPC.Reliable(world.SpawnBlock, position.X, position.Y, color, unbreakable);
     }
 }

src/Items/CreativeBuilding.cs

@@ -57,14 +57,14 @@ public class CreativeBuilding : Node2D
         if (_currentMode == BuildMode.Placing) {
             if (!_canBuild) _currentMode = null;
             else if (!Input.IsActionPressed("interact_primary")) {
-                RpcId(1, nameof(PlaceLine), _startPos.X, _startPos.Y, _direction, _length);
+                RPC.Reliable(1, PlaceLine, _startPos.X, _startPos.Y, _direction, _length);
                 _currentMode = null;
             }
         }
 
         if (_currentMode == BuildMode.Breaking) {
             if (!Input.IsActionPressed("interact_secondary")) {
-                RpcId(1, nameof(BreakLine), _startPos.X, _startPos.Y, _direction, _length);
+                RPC.Reliable(1, BreakLine, _startPos.X, _startPos.Y, _direction, _length);
                 _currentMode = null;
             }
         }
@@ -121,7 +121,7 @@ public class CreativeBuilding : Node2D
         foreach (var pos in GetBlockPositions(start, direction, length)) {
             if (world.GetBlockAt(pos) != null) continue;
             var color = Player.Color.Blend(Color.FromHsv(0.0F, 0.0F, GD.Randf(), 0.2F));
-            world.Rpc(nameof(World.SpawnBlock), pos.X, pos.Y, color, false);
+            RPC.Reliable(world.SpawnBlock, pos.X, pos.Y, color, false);
         }
     }
 
@@ -137,7 +137,7 @@ public class CreativeBuilding : Node2D
         foreach (var pos in GetBlockPositions(start, direction, length)) {
             var block = world.GetBlockAt(pos);
             if (block?.Unbreakable != false) continue;
-            world.Rpc(nameof(World.Despawn), world.GetPathTo(block));
+            RPC.Reliable(world.Despawn, world.GetPathTo(block));
         }
     }
 }

src/Items/Items.cs

@@ -39,16 +39,14 @@ public class Items : Node2D, IItems
         _current = node;
 
         if (sendRpc) {
-            if (this.GetGame() is Server) Rpc(nameof(DoSetCurrent), _current?.Name);
-            else RpcId(1, nameof(DoSetCurrent), _current?.Name);
+            if (this.GetGame() is Server) RPC.Reliable(DoSetCurrent, _current?.Name);
+            else RPC.Reliable(1, DoSetCurrent, _current?.Name);
         }
     }
     [Remote]
     public void DoSetCurrent(string name)
     {
-        if (this.GetGame() is Server) {
-            if (GetTree().GetRpcSenderId() != Player.NetworkID) return;
-        }
+        if ((this.GetGame() is Server) && (Player.NetworkID != GetTree().GetRpcSenderId())) return;
         var node = (name != null) ? GetNode<Node2D>(name) : null;
         SetCurrent(node, this.GetGame() is Server);
     }

src/Items/Weapon.cs

@@ -125,7 +125,7 @@ public class Weapon : Sprite
                 AimDirection = Cursor.Position.AngleToPoint(Player.Position) - angleC;
                 // FIXME: Angle calculation when cursor is too close to player.
 
-                RpcUnreliableId(1, nameof(SendAimAngle), AimDirection);
+                RPC.Unreliable(1, SendAimAngle, AimDirection);
                 Update();
             }
         } else {
@@ -147,7 +147,7 @@ public class Weapon : Sprite
             if (Player.NetworkID != GetTree().GetRpcSenderId()) return;
             // TODO: Verify input.
             // if ((value < 0) || (value > Mathf.Tau)) return;
-            Rpc(nameof(SendAimAngle), value);
+            RPC.Unreliable(SendAimAngle, value);
         } else if (!(Player is LocalPlayer))
             AimDirection = value;
     }
@@ -157,7 +157,7 @@ public class Weapon : Sprite
     {
         var seed = unchecked((int)GD.Randi());
         if (!FireInternal(AimDirection, Scale.y > 0, seed)) return;
-        RpcId(1, nameof(SendFire), AimDirection, Scale.y > 0, seed);
+        RPC.Reliable(1, SendFire, AimDirection, Scale.y > 0, seed);
         ((LocalPlayer)Player).Velocity -= Mathf.Polar2Cartesian(Knockback, Rotation);
     }
 
@@ -198,14 +198,14 @@ public class Weapon : Sprite
             if (Player.NetworkID != GetTree().GetRpcSenderId()) return;
             // TODO: Verify input.
             if (FireInternal(aimDirection, toRight, seed))
-                Rpc(nameof(SendFire), aimDirection, toRight, seed);
+                RPC.Reliable(SendFire, aimDirection, toRight, seed);
         } else if (!(Player is LocalPlayer))
             FireInternal(aimDirection, toRight, seed);
     }
 
 
     private void Reload()
-        { if (ReloadInternal()) RpcId(1, nameof(SendReload)); }
+        { if (ReloadInternal()) RPC.Reliable(1, SendReload); }
 
     private bool ReloadInternal()
     {
@@ -220,7 +220,7 @@ public class Weapon : Sprite
     {
         if (this.GetGame() is Server) {
             if (Player.NetworkID != GetTree().GetRpcSenderId()) return;
-            if (ReloadInternal()) Rpc(nameof(SendReload));
+            if (ReloadInternal()) RPC.Reliable(SendReload);
         } else if (!(Player is LocalPlayer))
             ReloadInternal();
     }

src/Objects/LocalPlayer.cs

@@ -23,7 +23,7 @@ public class LocalPlayer : Player
     public override void _Process(float delta)
     {
         base._Process(delta);
-        RpcUnreliableId(1, nameof(Player.Move), Position);
+        RPC.Unreliable(1, Move, Position);
     }
 
     public override void _PhysicsProcess(float delta)

src/Objects/Player.cs

@@ -31,6 +31,7 @@ public class Player : KinematicBody2D, IInitializable
     public override void _Process(float delta)
     {
         if ((Position.y > 9000) && (this.GetGame() is Server))
+            // Can't use RPC helper method here since player is not a LocalPlayer here.
             RpcId(NetworkID, nameof(LocalPlayer.ResetPosition), Vector2.Zero);
     }
 

src/Scenes/Server.cs

@@ -83,23 +83,23 @@ public class Server : Game
             var world = this.GetWorld();
 
             foreach (var player in world.Players) {
-                world.RpcId(networkID, nameof(World.SpawnPlayer), player.NetworkID, player.Position);
+                RPC.Reliable(networkID, world.SpawnPlayer, player.NetworkID, player.Position);
 
                 // Send player's appearance.
                 player.Rset(nameof(Player.DisplayName), player.DisplayName);
                 player.Rset(nameof(Player.Color), player.Color);
 
                 // Send player's currently equipped item.
-                if (player.Items.Current != null) ((Node2D)player.Items).RpcId(
-                    networkID, nameof(Items.DoSetCurrent), player.Items.Current.Name);
+                if (player.Items.Current != null) RPC.Reliable(networkID,
+                    ((Items)player.Items).DoSetCurrent, player.Items.Current.Name);
             }
 
             foreach (var block in world.Blocks)
-                world.RpcId(networkID, nameof(World.SpawnBlock),
+                RPC.Reliable(networkID, world.SpawnBlock,
                     block.Position.X, block.Position.Y,
                     block.Color, block.Unbreakable);
 
-            world.Rpc(nameof(World.SpawnPlayer), networkID, Vector2.Zero);
+            RPC.Reliable(world.SpawnPlayer, networkID, Vector2.Zero);
             if (IsSingleplayer) LocalPlayer = world.GetPlayer(networkID);
         }
     }
@@ -112,6 +112,6 @@ public class Server : Game
         // Local player stays around for reconnecting.
         if (LocalPlayer == player) return;
 
-        world.Rpc(nameof(World.Despawn), world.GetPathTo(player));
+        RPC.Reliable(world.Despawn, world.GetPathTo(player));
     }
 }

src/Utility/RPC.cs

@@ -0,0 +1,44 @@
+using System;
+using Godot;
+
+public static class RPC
+{
+    public static void Reliable(Action action) => GetNode(action).Rpc(action.Method.Name);
+    public static void Reliable<T>(Action<T> action, T arg) => GetNode(action).Rpc(action.Method.Name, arg);
+    public static void Reliable<T0, T1>(Action<T0, T1> action, T0 arg0, T1 arg1) => GetNode(action).Rpc(action.Method.Name, arg0, arg1);
+    public static void Reliable<T0, T1, T2>(Action<T0, T1, T2> action, T0 arg0, T1 arg1, T2 arg2) => GetNode(action).Rpc(action.Method.Name, arg0, arg1, arg2);
+    public static void Reliable<T0, T1, T2, T3>(Action<T0, T1, T2, T3> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3) => GetNode(action).Rpc(action.Method.Name, arg0, arg1, arg2, arg3);
+    public static void Reliable<T0, T1, T2, T3, T4>(Action<T0, T1, T2, T3, T4> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4) => GetNode(action).Rpc(action.Method.Name, arg0, arg1, arg2, arg3, arg4);
+    public static void Reliable<T0, T1, T2, T3, T4, T5>(Action<T0, T1, T2, T3, T4, T5> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) => GetNode(action).Rpc(action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5);
+    public static void Reliable<T0, T1, T2, T3, T4, T5, T6>(Action<T0, T1, T2, T3, T4, T5, T6> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6) => GetNode(action).Rpc(action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    public static void Reliable(int networkID, Action action) => GetNode(action).RpcId(networkID, action.Method.Name);
+    public static void Reliable<T>(int networkID, Action<T> action, T arg) => GetNode(action).RpcId(networkID, action.Method.Name, arg);
+    public static void Reliable<T0, T1>(int networkID, Action<T0, T1> action, T0 arg0, T1 arg1) => GetNode(action).RpcId(networkID, action.Method.Name, arg0, arg1);
+    public static void Reliable<T0, T1, T2>(int networkID, Action<T0, T1, T2> action, T0 arg0, T1 arg1, T2 arg2) => GetNode(action).RpcId(networkID, action.Method.Name, arg0, arg1, arg2);
+    public static void Reliable<T0, T1, T2, T3>(int networkID, Action<T0, T1, T2, T3> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3) => GetNode(action).RpcId(networkID, action.Method.Name, arg0, arg1, arg2, arg3);
+    public static void Reliable<T0, T1, T2, T3, T4>(int networkID, Action<T0, T1, T2, T3, T4> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4) => GetNode(action).RpcId(networkID, action.Method.Name, arg0, arg1, arg2, arg3, arg4);
+    public static void Reliable<T0, T1, T2, T3, T4, T5>(int networkID, Action<T0, T1, T2, T3, T4, T5> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) => GetNode(action).RpcId(networkID, action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5);
+    public static void Reliable<T0, T1, T2, T3, T4, T5, T6>(int networkID, Action<T0, T1, T2, T3, T4, T5, T6> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6) => GetNode(action).RpcId(networkID, action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    public static void Unreliable(Action action) => GetNode(action).RpcUnreliable(action.Method.Name);
+    public static void Unreliable<T>(Action<T> action, T arg) => GetNode(action).RpcUnreliable(action.Method.Name, arg);
+    public static void Unreliable<T0, T1>(Action<T0, T1> action, T0 arg0, T1 arg1) => GetNode(action).RpcUnreliable(action.Method.Name, arg0, arg1);
+    public static void Unreliable<T0, T1, T2>(Action<T0, T1, T2> action, T0 arg0, T1 arg1, T2 arg2) => GetNode(action).RpcUnreliable(action.Method.Name, arg0, arg1, arg2);
+    public static void Unreliable<T0, T1, T2, T3>(Action<T0, T1, T2, T3> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3) => GetNode(action).RpcUnreliable(action.Method.Name, arg0, arg1, arg2, arg3);
+    public static void Unreliable<T0, T1, T2, T3, T4>(Action<T0, T1, T2, T3, T4> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4) => GetNode(action).RpcUnreliable(action.Method.Name, arg0, arg1, arg2, arg3, arg4);
+    public static void Unreliable<T0, T1, T2, T3, T4, T5>(Action<T0, T1, T2, T3, T4, T5> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) => GetNode(action).RpcUnreliable(action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5);
+    public static void Unreliable<T0, T1, T2, T3, T4, T5, T6>(Action<T0, T1, T2, T3, T4, T5, T6> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6) => GetNode(action).RpcUnreliable(action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    public static void Unreliable(int networkID, Action action) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name);
+    public static void Unreliable<T>(int networkID, Action<T> action, T arg) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg);
+    public static void Unreliable<T0, T1>(int networkID, Action<T0, T1> action, T0 arg0, T1 arg1) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg0, arg1);
+    public static void Unreliable<T0, T1, T2>(int networkID, Action<T0, T1, T2> action, T0 arg0, T1 arg1, T2 arg2) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg0, arg1, arg2);
+    public static void Unreliable<T0, T1, T2, T3>(int networkID, Action<T0, T1, T2, T3> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg0, arg1, arg2, arg3);
+    public static void Unreliable<T0, T1, T2, T3, T4>(int networkID, Action<T0, T1, T2, T3, T4> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg0, arg1, arg2, arg3, arg4);
+    public static void Unreliable<T0, T1, T2, T3, T4, T5>(int networkID, Action<T0, T1, T2, T3, T4, T5> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5);
+    public static void Unreliable<T0, T1, T2, T3, T4, T5, T6>(int networkID, Action<T0, T1, T2, T3, T4, T5, T6> action, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6) => GetNode(action).RpcUnreliableId(networkID, action.Method.Name, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    private static Node GetNode(Delegate action) => (action.Target as Node) ?? throw new ArgumentException(
+        $"Target ({action.Target?.GetType().ToString() ?? "null"}) must be a Node", nameof(action));
+}