pusher · singhashmeet · Aug 4, 2022 · Jul 22, 2022 · Aug 2, 2022 · Aug 2, 2022
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,17 +1,20 @@
-# Changelog
-
-## 2.1.0
+# Changelog
+
+## 2.2.0
+* [ADDED] Support for subscription_count events
+
+## 2.1.0
 * [ADDED] Strong name to the PusherClient assembly.
 * [ADDED] Support for the authentication header on the HttpAuthorizer.
 * [ADDED] End-to-end encryption for private encrypted channels.
 * [ADDED] Method Channel.UnsubscribeAsync.
 * [ADDED] Host to PusherOptions.
 * [FIXED] The intermittent WebsocketAutoReconnect issue The socket is connecting, cannot connect again!
-
-## 2.0.1
-* [FIXED] Filter on event name in event emitter.
-
-## 2.0.0
+
+## 2.0.1
+* [FIXED] Filter on event name in event emitter.
+
+## 2.0.0
 * [FIXED] Infinite loop when failing to connect for the first time. 
 * [FIXED] Bug: GenericPresenceChannel<T>'s AddMember and RemoveMember events were not being emitted.
 * [FIXED] Change MemberRemovedEventHandler to MemberRemovedEventHandler<T>.

diff --git a/ExampleApplication/Program.cs b/ExampleApplication/Program.cs
@@ -67,7 +67,7 @@ private static async Task InitPusher()
         {
             _pusher = new Pusher(Config.AppKey, new PusherOptions
             {
-                Authorizer = new HttpAuthorizer("http://localhost:8888/auth/" + HttpUtility.UrlEncode(_name)),
+                Authorizer = new HttpAuthorizer("http://127.0.0.1:3030/pusher/auth" + HttpUtility.UrlEncode(_name)),
                 Cluster = Config.Cluster,
                 Encrypted = Config.Encrypted,
                 TraceLogger = new TraceLogger(),
@@ -96,6 +96,11 @@ private static async Task InitPusher()
                 }
             };
 
+            _pusher.CountHandler += (sender, data) => 
+            {
+                Console.WriteLine(data);
+            };
+
             // Setup private encrypted channel
             void GeneralListener(string eventName, PusherEvent eventData)
             {

diff --git a/PusherClient.Tests/AcceptanceTests/SubscriptionTest.PublicChannels.cs b/PusherClient.Tests/AcceptanceTests/SubscriptionTest.PublicChannels.cs
@@ -1,6 +1,7 @@
 using System.Threading.Tasks;
 using NUnit.Framework;
 using PusherClient.Tests.Utilities;
+using Newtonsoft.Json;
 
 namespace PusherClient.Tests.AcceptanceTests
 {
@@ -51,6 +52,20 @@ public async Task PublicChannelConnectThenSubscribeWithoutAnyEventHandlersAsync(
             ValidateSubscribedChannel(pusher, mockChannelName, channel, ChannelTypes.Public);
         }
 
+        [Test]
+        public async Task PublicChannelSubscribeAndRecieveCountEvent() {
+            var definition = new { subscription_count = 1 };
+            var pusher = PusherFactory.GetPusher(saveTo: _clients);
+
+            void PusherCountEventHandler(object sender, string data) {
+                var dataAsObj = JsonConvert.DeserializeAnonymousType(data, definition);
+                Assert.Equals(dataAsObj.subscription_count, 1);
+            }
+
+            pusher.CountHandler += PusherCountEventHandler;
+            await ConnectThenSubscribeTestAsync(ChannelTypes.Public, pusher: pusher);
+        }
+
         [Test]
         public async Task PublicChannelUnsubscribeUsingChannelUnsubscribeAsync()
         {

diff --git a/PusherClient/Channel.cs b/PusherClient/Channel.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
+using Newtonsoft.Json;
 
 namespace PusherClient
 {
@@ -20,6 +21,9 @@ public class Channel : EventEmitter
         /// Fired when the Channel has successfully been subscribed to.
         /// </summary>
         internal event SubscriptionEventHandler Subscribed;
+        internal event SubscriptionCountHandler CountHandler;
+
+        public int SubscriptionCount = 0;
 
         /// <summary>
         /// Gets whether the Channel is currently Subscribed
@@ -93,6 +97,21 @@ internal virtual void SubscriptionSucceeded(string data)
             }
         }
 
+        internal virtual void SubscriberCount(string data)
+        {   SubscriptionCount = ParseCount(data);
+            if (CountHandler != null)
+            {
+                try
+                {
+                    CountHandler.Invoke(this, data);
+                }
+                catch (Exception error)
+                {
+                    _pusher.RaiseChannelError(new SubscribedEventHandlerException(this, error, data));
+                }
+            }
+        }
+
         /// <summary>
         /// Removes the channel subscription.
         /// </summary>
@@ -158,5 +177,17 @@ public static ChannelTypes GetChannelType(string channelName)
 
             return channelType;
         }
+
+        public class SubscriptionCountData
+        {
+            [JsonProperty("subscription_count")]
+            public int subscriptionCount { get; set; }
+        }
+
+        private int ParseCount(string data)
+        {
+            var dataAsObj = JsonConvert.DeserializeObject<SubscriptionCountData>(data);
+            return dataAsObj.subscriptionCount;
+        }
     }
-}
+}
diff --git a/PusherClient/Connection.cs b/PusherClient/Connection.cs
@@ -233,6 +233,10 @@ private bool ProcessPusherChannelEvent(string eventName, string channelName, str
                 case Constants.CHANNEL_MEMBER_REMOVED:
                     _pusher.RemoveMember(channelName, messageData);
                     break;
+
+                case Constants.CHANNEL_SUBSCRIPTION_COUNT:
+                    _pusher.SubscriberCount(channelName, messageData);
+                    break;
 
                 default:
                     processed = false;

diff --git a/PusherClient/Constants.cs b/PusherClient/Constants.cs
@@ -10,6 +10,7 @@ class Constants
         public const string CHANNEL_SUBSCRIBE = "pusher:subscribe";
         public const string CHANNEL_UNSUBSCRIBE = "pusher:unsubscribe";
         public const string CHANNEL_SUBSCRIPTION_SUCCEEDED = "pusher_internal:subscription_succeeded";
+        public const string CHANNEL_SUBSCRIPTION_COUNT = "pusher_internal:subscription_count";
         public const string CHANNEL_SUBSCRIPTION_ERROR = "pusher_internal:subscription_error";
         public const string CHANNEL_MEMBER_ADDED = "pusher_internal:member_added";
         public const string CHANNEL_MEMBER_REMOVED = "pusher_internal:member_removed";

diff --git a/PusherClient/EventHandler.cs b/PusherClient/EventHandler.cs
@@ -61,4 +61,6 @@ namespace PusherClient
     /// To be deprecated, please use <see cref="SubscribedEventHandler"/> instead.
     /// </remarks>
     public delegate void SubscriptionEventHandler(object sender);
-}
+
+    public delegate void SubscriptionCountHandler(object sender, string data);
+}
diff --git a/PusherClient/IPusher.cs b/PusherClient/IPusher.cs
@@ -9,6 +9,7 @@ internal interface IPusher
         void AddMember(string channelName, string member);
         void RemoveMember(string channelName, string member);
         void SubscriptionSuceeded(string channelName, string data);
+        void SubscriberCount(string channelName, string data);
         void SubscriptionFailed(string channelName, string data);
         IEventBinder GetEventBinder(string eventBinderKey);
         IEventBinder GetChannelEventBinder(string eventBinderKey, string channelName);

diff --git a/PusherClient/Pusher.cs b/PusherClient/Pusher.cs
@@ -38,6 +38,7 @@ public class Pusher : EventEmitter, IPusher, ITriggerChannels
         /// Fires when a channel becomes subscribed.
         /// </summary>
         public event SubscribedEventHandler Subscribed;
+        public event SubscriptionCountHandler CountHandler;
 
         private static string Version { get; } = typeof(Pusher).GetTypeInfo().Assembly.GetName().Version.ToString(3);
 
@@ -213,6 +214,20 @@ void IPusher.RemoveMember(string channelName, string member)
             }
         }
 
+        void IPusher.SubscriberCount(string channelName, string data)
+        {
+            if (Channels.TryGetValue(channelName, out Channel channel))
+            {
+                channel.SubscriberCount(data);
+                if (CountHandler != null) {
+                    Task.Run(() =>
+                    {
+                        CountHandler.Invoke(this, data);
+                    });
+                }
+            }
+        }
+
         void IPusher.SubscriptionSuceeded(string channelName, string data)
         {
             if (Channels.TryGetValue(channelName, out Channel channel))

diff --git a/README.md b/README.md
@@ -23,45 +23,49 @@ For integrating **Pusher Channels** with **Unity** follow the instructions at <h
 
 ## Contents
 
-- [Installation](#installation)
-- [API](#api)
-  - [Overview](#overview)
-  - [Sample application](#sample-application)
-- [Configuration](#configuration)
-  - [The PusherOptions object](#the-pusheroptions-object)
-  - [Application Key](#application-key)
-- [Connecting](#connecting)
-  - [Connection States](#connection-States)
-  - [Auto reconnect](#auto-reconnect)
-  - [Disconnecting](#disconnecting)
-  - [Connected and Disconnected delegates](#connected-and-disconnected-delegates)
-- [Subscribing](#subscribing)
-  - [Error handling](#error-handling)
-  - [Public channels](#public-channels)
-  - [Private channels](#private-channels)
-  - [Private encrypted channels](#private-encrypted-channels)
-  - [Presence channels](#Presence-channels)
-  - [HttpAuthorizer](#httpauthorizer)
-  - [Subscribed delegate](#subscribed-delegate)
-  - [Unsubscribe](#unsubscribe)
-- [Binding to events](#binding-to-events)
-  - [Per-channel](#per-channel)
-  - [Globally](#globally)
-- [Triggering events](#triggering-events)
-- [Developer notes](#developer-notes)
-  - [Testing](#testing)
-  - [Code signing key generation](#code-signing-key-generation)
-  - [Migrating from version 1 to version 2](#migrating-from-version-1-to-version-2)
-    - [Changed in the Pusher class](#changed-in-the-pusher-class)
-    - [Removed from the Pusher class](#removed-from-the-pusher-class)
-    - [Removed from the Channel class](#removed-from-the-channel-class)
-    - [Removed from the GenericPresenceChannel class](#removed-from-the-genericpresencechannel-class)
-    - [Removed from the ConnectionState enum](#removed-from-the-connectionstate-enum)
-    - [Changed in the GenericPresenceChannel class](#changed-in-the-genericpresencechannel-class)
-    - [Added to the Pusher class](#added-to-the-pusher-class)
-    - [Added to the GenericPresenceChannel class](#added-to-the-genericpresencechannel-class)
-    - [Added to the ErrorCodes enum](#added-to-the-errorcodes-enum)
-- [License](#license)
+- [Pusher Channels .NET Client library](#pusher-channels-net-client-library)
+  - [Supported platforms](#supported-platforms)
+  - [Contents](#contents)
+  - [Installation](#installation)
+  - [API](#api)
+    - [Overview](#overview)
+    - [Sample application](#sample-application)
+  - [Configuration](#configuration)
+    - [The PusherOptions object](#the-pusheroptions-object)
+    - [Application Key](#application-key)
+  - [Connecting](#connecting)
+    - [Connection States](#connection-states)
+    - [Auto reconnect](#auto-reconnect)
+    - [Disconnecting](#disconnecting)
+    - [Connected and Disconnected delegates](#connected-and-disconnected-delegates)
+  - [Subscribing](#subscribing)
+    - [Error handling](#error-handling)
+    - [Public channels](#public-channels)
+    - [Private channels](#private-channels)
+    - [Private encrypted channels](#private-encrypted-channels)
+    - [Presence channels](#presence-channels)
+    - [HttpAuthorizer](#httpauthorizer)
+    - [Subscribed delegate](#subscribed-delegate)
+    - [Unsubscribe](#unsubscribe)
+  - [Subscription Count Handler](#subscription-count-handler)
+  - [Binding to events](#binding-to-events)
+    - [Per-channel](#per-channel)
+    - [Globally](#globally)
+  - [Triggering events](#triggering-events)
+  - [Developer notes](#developer-notes)
+    - [Testing](#testing)
+    - [Code signing key generation](#code-signing-key-generation)
+    - [Migrating from version 1 to version 2](#migrating-from-version-1-to-version-2)
+      - [Changed in the Pusher class](#changed-in-the-pusher-class)
+      - [Removed from the Pusher class](#removed-from-the-pusher-class)
+      - [Removed from the Channel class](#removed-from-the-channel-class)
+      - [Removed from the GenericPresenceChannel class](#removed-from-the-genericpresencechannel-class)
+      - [Removed from the ConnectionState enum](#removed-from-the-connectionstate-enum)
+      - [Changed in the GenericPresenceChannel class](#changed-in-the-genericpresencechannel-class)
+      - [Added to the Pusher class](#added-to-the-pusher-class)
+      - [Added to the GenericPresenceChannel class](#added-to-the-genericpresencechannel-class)
+      - [Added to the ErrorCodes enum](#added-to-the-errorcodes-enum)
+  - [License](#license)
 
 ## Installation
 
@@ -930,6 +934,19 @@ await pusher.UnsubscribeAllAsync().ConfigureAwait(false);
 
 ```
 
+## Subscription Count Handler
+
+Add this handler to recieve subscription count events. Read more about it [here](https://pusher.com/docs/channels/using_channels/events/#pushersubscription_count-1165820117)
+
+```cs
+void PusherCountEventHandler(object sender, string data) {
+    var dataAsObj = JsonConvert.DeserializeObject<SubscriptionCountData>(data);
+    Console.WriteLine(dataAsObj.subscriptionCount);
+}
+
+pusher.CountHandler += PusherCountEventHandler;
+```
+
 ## Binding to events
 
 Events can be bound to at two levels; per-channel or globally.