Basic Bot Analytics System

application/src/main/java/org/togetherjava/tjbot/Application.java

@@ -12,6 +12,7 @@
 import org.togetherjava.tjbot.db.Database;
 import org.togetherjava.tjbot.features.Features;
 import org.togetherjava.tjbot.features.SlashCommandAdapter;
+import org.togetherjava.tjbot.features.analytics.Metrics;
 import org.togetherjava.tjbot.features.system.BotCore;
 import org.togetherjava.tjbot.logging.LogMarkers;
 import org.togetherjava.tjbot.logging.discord.DiscordLogging;
@@ -82,13 +83,15 @@ public static void runBot(Config config) {
             }
             Database database = new Database("jdbc:sqlite:" + databasePath.toAbsolutePath());
 
+            Metrics metrics = new Metrics(database);
+
             JDA jda = JDABuilder.createDefault(config.getToken())
                 .enableIntents(GatewayIntent.GUILD_MEMBERS, GatewayIntent.MESSAGE_CONTENT)
                 .build();
 
             jda.awaitReady();
 
-            BotCore core = new BotCore(jda, database, config);
+            BotCore core = new BotCore(jda, database, config, metrics);
             CommandReloading.reloadCommands(jda, core);
             core.scheduleRoutines(jda);
 

application/src/main/java/org/togetherjava/tjbot/features/Features.java

@@ -6,6 +6,7 @@
 import org.togetherjava.tjbot.config.FeatureBlacklist;
 import org.togetherjava.tjbot.config.FeatureBlacklistConfig;
 import org.togetherjava.tjbot.db.Database;
+import org.togetherjava.tjbot.features.analytics.Metrics;
 import org.togetherjava.tjbot.features.basic.MemberCountDisplayRoutine;
 import org.togetherjava.tjbot.features.basic.PingCommand;
 import org.togetherjava.tjbot.features.basic.QuoteBoardForwarder;
@@ -91,7 +92,7 @@
  * it with the system.
  * <p>
  * To add a new slash command, extend the commands returned by
- * {@link #createFeatures(JDA, Database, Config)}.
+ * {@link #createFeatures(JDA, Database, Config, Metrics)}.
  */
 public class Features {
     private Features() {
@@ -107,9 +108,12 @@ private Features() {
      * @param jda the JDA instance commands will be registered at
      * @param database the database of the application, which features can use to persist data
      * @param config the configuration features should use
+     * @param metrics the metrics service for tracking analytics
      * @return a collection of all features
      */
-    public static Collection<Feature> createFeatures(JDA jda, Database database, Config config) {
+    @SuppressWarnings("unused")
+    public static Collection<Feature> createFeatures(JDA jda, Database database, Config config,
+            Metrics metrics) {
         FeatureBlacklistConfig blacklistConfig = config.getFeatureBlacklistConfig();
         JShellEval jshellEval = new JShellEval(config.getJshell(), config.getGitHubApiKey());
 

application/src/main/java/org/togetherjava/tjbot/features/analytics/Metrics.java

@@ -0,0 +1,56 @@
+package org.togetherjava.tjbot.features.analytics;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.togetherjava.tjbot.db.Database;
+import org.togetherjava.tjbot.db.generated.tables.MetricEvents;
+
+import java.time.Instant;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Service for tracking and recording events for analytics purposes.
+ */
+public final class Metrics {
+    private static final Logger logger = LoggerFactory.getLogger(Metrics.class);
+
+    private final Database database;
+
+    private final ExecutorService service = Executors.newSingleThreadExecutor();
+
+    /**
+     * Creates a new instance.
+     *
+     * @param database the database to use for storing and retrieving analytics data
+     */
+    public Metrics(Database database) {
+        this.database = database;
+    }
+
+    /**
+     * Track an event execution.
+     *
+     * @param event the event to save
+     */
+    public void count(String event) {
+        logger.debug("Counting new record for event: {}", event);
+        Instant moment = Instant.now();
+        service.submit(() -> processEvent(event, moment));
+
+    }
+
+    /**
+     *
+     * @param event the event to save
+     * @param happenedAt the moment when the event is dispatched
+     */
+    private void processEvent(String event, Instant happenedAt) {
+        database.write(context -> context.newRecord(MetricEvents.METRIC_EVENTS)
+            .setEvent(event)
+            .setHappenedAt(happenedAt)
+            .insert());
+    }
+
+}

application/src/main/java/org/togetherjava/tjbot/features/analytics/package-info.java

@@ -0,0 +1,13 @@
+/**
+ * Analytics system for collecting and persisting bot activity metrics.
+ * <p>
+ * This package provides services and components that record events for later analysis and reporting
+ * across multiple feature areas.
+ */
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package org.togetherjava.tjbot.features.analytics;
+
+import org.togetherjava.tjbot.annotations.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;

application/src/main/java/org/togetherjava/tjbot/features/system/BotCore.java

@@ -23,7 +23,6 @@
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import net.dv8tion.jda.api.interactions.callbacks.IReplyCallback;
 import net.dv8tion.jda.api.interactions.components.ComponentInteraction;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.Unmodifiable;
 import org.slf4j.Logger;
@@ -42,6 +41,7 @@
 import org.togetherjava.tjbot.features.UserInteractionType;
 import org.togetherjava.tjbot.features.UserInteractor;
 import org.togetherjava.tjbot.features.VoiceReceiver;
+import org.togetherjava.tjbot.features.analytics.Metrics;
 import org.togetherjava.tjbot.features.componentids.ComponentId;
 import org.togetherjava.tjbot.features.componentids.ComponentIdParser;
 import org.togetherjava.tjbot.features.componentids.ComponentIdStore;
@@ -79,13 +79,13 @@ public final class BotCore extends ListenerAdapter implements CommandProvider {
     private static final ExecutorService COMMAND_SERVICE = Executors.newCachedThreadPool();
     private static final ScheduledExecutorService ROUTINE_SERVICE =
             Executors.newScheduledThreadPool(5);
-    private final Config config;
     private final Map<String, UserInteractor> prefixedNameToInteractor;
     private final List<Routine> routines;
     private final ComponentIdParser componentIdParser;
     private final ComponentIdStore componentIdStore;
     private final Map<Pattern, MessageReceiver> channelNameToMessageReceiver = new HashMap<>();
     private final Map<Pattern, VoiceReceiver> channelNameToVoiceReceiver = new HashMap<>();
+    private final Metrics metrics;
 
     /**
      * Creates a new command system which uses the given database to allow commands to persist data.
@@ -95,10 +95,11 @@ public final class BotCore extends ListenerAdapter implements CommandProvider {
      * @param jda the JDA instance that this command system will be used with
      * @param database the database that commands may use to persist data
      * @param config the configuration to use for this system
+     * @param metrics the metrics service for tracking analytics
      */
-    public BotCore(JDA jda, Database database, Config config) {
-        this.config = config;
-        Collection<Feature> features = Features.createFeatures(jda, database, config);
+    public BotCore(JDA jda, Database database, Config config, Metrics metrics) {
+        this.metrics = metrics;
+        Collection<Feature> features = Features.createFeatures(jda, database, config, metrics);
 
         // Message receivers
         features.stream()
@@ -300,14 +301,14 @@ private Optional<Channel> selectPreferredAudioChannel(@Nullable AudioChannelUnio
     }
 
     @Override
-    public void onGuildVoiceUpdate(@NotNull GuildVoiceUpdateEvent event) {
+    public void onGuildVoiceUpdate(GuildVoiceUpdateEvent event) {
         selectPreferredAudioChannel(event.getChannelJoined(), event.getChannelLeft())
             .ifPresent(channel -> getVoiceReceiversSubscribedTo(channel)
                 .forEach(voiceReceiver -> voiceReceiver.onVoiceUpdate(event)));
     }
 
     @Override
-    public void onGuildVoiceVideo(@NotNull GuildVoiceVideoEvent event) {
+    public void onGuildVoiceVideo(GuildVoiceVideoEvent event) {
         AudioChannelUnion channel = event.getVoiceState().getChannel();
 
         if (channel == null) {
@@ -319,7 +320,7 @@ public void onGuildVoiceVideo(@NotNull GuildVoiceVideoEvent event) {
     }
 
     @Override
-    public void onGuildVoiceStream(@NotNull GuildVoiceStreamEvent event) {
+    public void onGuildVoiceStream(GuildVoiceStreamEvent event) {
         AudioChannelUnion channel = event.getVoiceState().getChannel();
 
         if (channel == null) {
@@ -331,7 +332,7 @@ public void onGuildVoiceStream(@NotNull GuildVoiceStreamEvent event) {
     }
 
     @Override
-    public void onGuildVoiceMute(@NotNull GuildVoiceMuteEvent event) {
+    public void onGuildVoiceMute(GuildVoiceMuteEvent event) {
         AudioChannelUnion channel = event.getVoiceState().getChannel();
 
         if (channel == null) {
@@ -343,7 +344,7 @@ public void onGuildVoiceMute(@NotNull GuildVoiceMuteEvent event) {
     }
 
     @Override
-    public void onGuildVoiceDeafen(@NotNull GuildVoiceDeafenEvent event) {
+    public void onGuildVoiceDeafen(GuildVoiceDeafenEvent event) {
         AudioChannelUnion channel = event.getVoiceState().getChannel();
 
         if (channel == null) {
@@ -380,10 +381,16 @@ public void onSlashCommandInteraction(SlashCommandInteractionEvent event) {
 
         logger.debug("Received slash command '{}' (#{}) on guild '{}'", name, event.getId(),
                 event.getGuild());
-        COMMAND_SERVICE.execute(
-                () -> requireUserInteractor(UserInteractionType.SLASH_COMMAND.getPrefixedName(name),
-                        SlashCommand.class)
-                    .onSlashCommand(event));
+        COMMAND_SERVICE.execute(() -> {
+
+            SlashCommand interactor = requireUserInteractor(
+                    UserInteractionType.SLASH_COMMAND.getPrefixedName(name), SlashCommand.class);
+
+            metrics.count("slash-" + name);
+
+            interactor.onSlashCommand(event);
+
+        });
     }
 
     @Override

application/src/main/resources/db/V16__Add_Analytics_System.sql

@@ -0,0 +1,6 @@
+CREATE TABLE metric_events
+(
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    event       TEXT      NOT NULL,
+    happened_at TIMESTAMP NOT NULL
+);