profcollect: Trace on camera open events

This allows us to collect traces for camera related libraries, like
libg3a. For the initial experiment, we collect the traces one second
after the camera opens. We can fine tune this or switch to other
triggers once we have the benchmark numbers.

Test: manual
Bug: 319394981
Change-Id: Ia65694602af1054dd261f4e72c1c3f82056eb1e3

1 files changed, 35 insertions, 0 deletions

diff --git a/services/profcollect/src/com/android/server/profcollect/ProfcollectForwardingService.java b/services/profcollect/src/com/android/server/profcollect/ProfcollectForwardingService.java
index 33bf4bd1cc02..c0259135132b 100644
--- a/services/profcollect/src/com/android/server/profcollect/ProfcollectForwardingService.java
+++ b/services/profcollect/src/com/android/server/profcollect/ProfcollectForwardingService.java
@@ -25,6 +25,7 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.hardware.camera2.CameraManager;
 import android.os.Handler;
 import android.os.IBinder.DeathRecipient;
 import android.os.Looper;
@@ -258,6 +259,7 @@ public final class ProfcollectForwardingService extends SystemService {
         BackgroundThread.get().getThreadHandler().post(
                 () -> {
                     registerAppLaunchObserver();
+                    registerCameraOpenObserver();
                     registerDex2oatObserver();
                     registerOTAObserver();
                 });
@@ -371,4 +373,37 @@ public final class ProfcollectForwardingService extends SystemService {
             pfs.getContext().sendBroadcast(intent);
         });
     }
+
+    private void registerCameraOpenObserver() {
+        CameraManager cm = getContext().getSystemService(CameraManager.class);
+        cm.registerAvailabilityCallback(new CameraManager.AvailabilityCallback() {
+            @Override
+            public void onCameraOpened(String cameraId, String packageId) {
+                Log.d(LOG_TAG, "Received camera open event from: " + packageId);
+                // Skip face auth and Android System Intelligence, since they trigger way too
+                // often.
+                if (packageId.startsWith("client.pid")
+                        || packageId.equals("com.google.android.as")) {
+                    return;
+                }
+                // Sample for a fraction of camera events.
+                final int traceFrequency =
+                        DeviceConfig.getInt(DeviceConfig.NAMESPACE_PROFCOLLECT_NATIVE_BOOT,
+                        "camera_trace_freq", 10);
+                int randomNum = ThreadLocalRandom.current().nextInt(100);
+                if (randomNum >= traceFrequency) {
+                    return;
+                }
+                BackgroundThread.get().getThreadHandler().post(() -> {
+                    try {
+                        // Wait for a short time before starting tracing.
+                        Thread.sleep(1000);
+                        mIProfcollect.trace_once("camera");
+                    } catch (RemoteException | InterruptedException e) {
+                        Log.e(LOG_TAG, "Failed to initiate trace: " + e.getMessage());
+                    }
+                });
+            }
+        }, null);
+    }
 }