Log message on robot mode changes

photon-core/src/main/java/org/photonvision/common/dataflow/networktables/NTDriverStation.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) Photon Vision.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.photonvision.common.dataflow.networktables;
+
+import edu.wpi.first.networktables.BooleanSubscriber;
+import edu.wpi.first.networktables.IntegerSubscriber;
+import edu.wpi.first.networktables.NetworkTable;
+import edu.wpi.first.networktables.NetworkTableEvent.Kind;
+import edu.wpi.first.networktables.NetworkTableInstance;
+import edu.wpi.first.networktables.StringSubscriber;
+import java.util.EnumSet;
+import org.photonvision.common.logging.LogGroup;
+import org.photonvision.common.logging.Logger;
+
+// Helper to print when the robot transitions modes
+public class NTDriverStation {
+    private static final Logger logger = new Logger(NTDriverStation.class, LogGroup.NetworkTables);
+
+    // Copy since stuff was private
+    public record NtControlWord(
+            boolean m_enabled,
+            boolean m_autonomous,
+            boolean m_test,
+            boolean m_emergencyStop,
+            boolean m_fmsAttached,
+            boolean m_dsAttached) {
+        public NtControlWord() {
+            this(false, false, false, false, false, false);
+        }
+    }
+
+    private IntegerSubscriber ntControlWord;
+
+    private StringSubscriber eventName;
+    private IntegerSubscriber matchNumber;
+    private IntegerSubscriber replayNumber;
+    private IntegerSubscriber matchType;
+    private BooleanSubscriber isRedAlliance;
+    private IntegerSubscriber stationNumber;
+
+    NtControlWord lastControlWord = new NtControlWord();
+
+    public NTDriverStation(NetworkTableInstance inst) {
+        NetworkTable fmsTable = inst.getTable("FMSInfo");
+        this.ntControlWord = fmsTable.getIntegerTopic("FMSControlData").subscribe(0);
+        this.eventName = fmsTable.getStringTopic("EventName").subscribe("");
+        this.matchType = fmsTable.getIntegerTopic("MatchType").subscribe(0);
+        this.matchNumber = fmsTable.getIntegerTopic("MatchNumber").subscribe(0);
+        this.replayNumber = fmsTable.getIntegerTopic("ReplayNumber").subscribe(0);
+
+        this.isRedAlliance = fmsTable.getBooleanTopic("isRedAlliance").subscribe(true);
+        this.stationNumber = fmsTable.getIntegerTopic("StationNumber").subscribe(0);
+
+        fmsTable.addListener(
+                "FMSControlData",
+                EnumSet.of(Kind.kValueAll),
+                (table, key, event) -> {
+                    if (event.is(Kind.kValueAll) && event.valueData.value.isInteger()) {
+                        // Logger totally isnt thread safe but whatevs
+                        var word = NTDriverStation.getControlWord(event.valueData.value.getInteger());
+
+                        printTransition(this.lastControlWord, word);
+                        printMatchData();
+                        this.lastControlWord = word;
+                    }
+                });
+
+        // Slight data race here but whatever
+        NtControlWord word = NTDriverStation.getControlWord(this.ntControlWord.get());
+
+        printTransition(this.lastControlWord, word);
+        printMatchData();
+        this.lastControlWord = word;
+    }
+
+    private void printTransition(NtControlWord old, NtControlWord newWord) {
+        logger.info("ROBOT TRANSITIONED MODES! From " + old.toString() + " to " + newWord.toString());
+    }
+
+    private void printMatchData() {
+        // this information seems to be published at the same time
+        String event = eventName.get();
+        if (event.isBlank()) {
+            // nothing to log
+            return;
+        }
+        String type =
+                switch ((int) matchType.get()) {
+                    case 1 -> "P";
+                    case 2 -> "Q";
+                    case 3 -> "E";
+                    default -> "";
+                };
+        var match = String.valueOf(matchNumber.get());
+        var replay = replayNumber.get();
+
+        var station = (isRedAlliance.get() ? "RED" : "BLUE") + stationNumber.get();
+
+        var message =
+                "Event: "
+                        + event
+                        + ", Match: "
+                        + type
+                        + match
+                        + ", Replay: "
+                        + replay
+                        + ", Station: "
+                        + station;
+        logger.info(message);
+    }
+
+    // Copied from
+    // https://github.com/wpilibsuite/allwpilib/blob/07192285f65321a2f7363227a2216f09b715252d/hal/src/main/java/edu/wpi/first/hal/DriverStationJNI.java#L123C1-L140C4
+    // TODO: upstream!
+    /**
+     * Gets the current control word of the driver station.
+     *
+     * <p>The control work contains the robot state.
+     *
+     * @param controlWord the ControlWord to update
+     * @return
+     * @see "HAL_GetControlWord"
+     */
+    private static NtControlWord getControlWord(long word) {
+        return new NtControlWord(
+                (word & 1) != 0,
+                ((word >> 1) & 1) != 0,
+                ((word >> 2) & 1) != 0,
+                ((word >> 3) & 1) != 0,
+                ((word >> 4) & 1) != 0,
+                ((word >> 5) & 1) != 0);
+    }
+}

photon-core/src/main/java/org/photonvision/common/dataflow/networktables/NetworkTablesManager.java

@@ -58,6 +58,8 @@ public class NetworkTablesManager {
 
     private final TimeSyncManager m_timeSync = new TimeSyncManager(kRootTable);
 
+    NTDriverStation ntDriverStation;
+
     private NetworkTablesManager() {
         ntInstance.addLogger(
                 LogMessage.kInfo, LogMessage.kCritical, this::logNtMessage); // to hide error messages
@@ -66,6 +68,8 @@ private NetworkTablesManager() {
         ntInstance.addListener(
                 m_fieldLayoutSubscriber, EnumSet.of(Kind.kValueAll), this::onFieldLayoutChanged);
 
+        ntDriverStation = new NTDriverStation(this.getNTInst());
+
         // Get the UI state in sync with the backend. NT should fire a callback when it first connects
         // to the robot
         broadcastConnectedStatus();