Move server count reporting to be handled per-shard

BackgroundServices/ExternalStatisticsReporting.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Net.Http;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace BirthdayBot.BackgroundServices
+{
+    /// <summary>
+    /// Reports user count statistics to external services on a shard by shard basis.
+    /// </summary>
+    class ExternalStatisticsReporting : BackgroundService
+    {
+        const int ProcessInterval = 600 / ShardBackgroundWorker.Interval; // Process every ~5 minutes
+        private int _tickCount = 0;
+
+        private static readonly HttpClient _httpClient = new HttpClient();
+
+        public ExternalStatisticsReporting(ShardInstance instance) : base(instance) { }
+
+        public override async Task OnTick(CancellationToken token)
+        {
+            if (++_tickCount % ProcessInterval != 0) return;
+
+            var botId = ShardInstance.DiscordClient.CurrentUser.Id;
+            if (botId == 0) return;
+
+            await SendDiscordBots(ShardInstance.DiscordClient.Guilds.Count, botId, token);
+        }
+
+        private async Task SendDiscordBots(int userCount, ulong botId, CancellationToken token)
+        {
+            var dbotsToken = ShardInstance.Config.DBotsToken;
+            if (dbotsToken != null)
+            {
+                try
+                {
+                    const string dBotsApiUrl = "https://discord.bots.gg/api/v1/bots/{0}/stats";
+                    const string Body = "{{ \"guildCount\": {0}, \"shardCount\": {1}, \"shardId\": {2} }}";
+                    var uri = new Uri(string.Format(dBotsApiUrl, botId));
+
+                    var post = new HttpRequestMessage(HttpMethod.Post, uri);
+                    post.Headers.Add("Authorization", dbotsToken);
+                    post.Content = new StringContent(string.Format(Body,
+                        userCount, ShardInstance.Config.ShardTotal, ShardInstance.ShardId),
+                        Encoding.UTF8, "application/json");
+
+                    await _httpClient.SendAsync(post, token);
+                    Log("Discord Bots: Update successful.");
+                }
+                catch (Exception ex)
+                {
+                    Log("Discord Bots: Exception encountered during update: " + ex.Message);
+                }
+            }
+        }
+    }
+}

BackgroundServices/ShardBackgroundWorker.cs

@@ -39,7 +39,8 @@ namespace BirthdayBot.BackgroundServices
             {
                 {UserDownloader},
                 {BirthdayUpdater},
-                {new DataRetention(instance)}
+                {new DataRetention(instance)},
+                {new ExternalStatisticsReporting(instance)}
             };
 
             _workerTask = Task.Factory.StartNew(WorkerLoop, _workerCanceller.Token);

ShardManager.cs

@@ -5,7 +5,6 @@ using Discord.WebSocket;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Net.Http;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -167,8 +166,6 @@ namespace BirthdayBot
                     var guildTotal = guildCounts.Sum();
                     var guildAverage = guildCounts.Any() ? guildCounts.Average() : 0;
                     Log($"Currently in {guildTotal} guilds. Average shard load: {guildAverage:0.0}.");
-                    if (nullShards.Count == 0 && botId.HasValue)
-                        await SendExternalStatistics(guildTotal, botId.Value, _watchdogCancel.Token).ConfigureAwait(false);
 
                     // Health report
                     var goodShards = new List<int>();
@@ -243,37 +240,5 @@ namespace BirthdayBot
             }
             catch (TaskCanceledException) { }
         }
-
-        #region Statistical reporting
-        private static readonly HttpClient _httpClient = new HttpClient();
-
-        /// <summary>
-        /// Send statistical information to external services.
-        /// </summary>
-        private async Task SendExternalStatistics(int count, ulong botId, CancellationToken token)
-        {
-            var dbotsToken = Config.DBotsToken;
-            if (dbotsToken != null)
-            {
-                try
-                {
-                    const string dBotsApiUrl = "https://discord.bots.gg/api/v1/bots/{0}/stats";
-                    const string Body = "{{ \"guildCount\": {0} }}";
-                    var uri = new Uri(string.Format(dBotsApiUrl, botId));
-
-                    var post = new HttpRequestMessage(HttpMethod.Post, uri);
-                    post.Headers.Add("Authorization", dbotsToken);
-                    post.Content = new StringContent(string.Format(Body, count), Encoding.UTF8, "application/json");
-
-                    await _httpClient.SendAsync(post, token);
-                    Log("Discord Bots: Update successful.");
-                }
-                catch (Exception ex)
-                {
-                    Log("Discord Bots: Exception encountered during update: " + ex.Message);
-                }
-            }
-        }
-        #endregion
     }
 }