Move leakcanary to open source and add build files

Summary:
Made sure it builds with both buck and Gradle.

Follow-up to D8865149.

Reviewed By: danielbuechele

Differential Revision: D9178885

fbshipit-source-id: 46efaa532efdc1d59ce76e04be6680e233084881

android/build.gradle

@@ -51,6 +51,7 @@ android {
         implementation deps.lithoCore
         implementation deps.lithoWidget
         implementation deps.rhino
+        implementation deps.leakcanary
     }
 }
 

android/src/main/java/com/facebook/sonar/plugins/leakcanary/LeakCanarySonarPlugin.java

@@ -0,0 +1,76 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+
+package com.facebook.sonar.plugins.leakcanary;
+
+import android.util.Log;
+import com.facebook.sonar.core.SonarConnection;
+import com.facebook.sonar.core.SonarObject;
+import com.facebook.sonar.core.SonarPlugin;
+import com.facebook.sonar.core.SonarReceiver;
+import com.facebook.sonar.core.SonarResponder;
+import java.util.ArrayList;
+import java.util.List;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+public class LeakCanarySonarPlugin implements SonarPlugin {
+
+  private static final String TAG = "LeakCanarySonarPlugin";
+
+  private static final String REPORT_LEAK_EVENT = "reportLeak";
+  private static final String CLEAR_EVENT = "clear";
+  private static final String LEAKS_KEY = "leaks";
+
+  private SonarConnection mConnection;
+
+  private final List<String> leakList = new ArrayList<>();
+
+  @Override
+  public String getId() {
+    return "LeakCanary";
+  }
+
+  @Override
+  public void onConnect(SonarConnection connection) {
+    mConnection = connection;
+    sendLeakList();
+
+    mConnection.receive(
+        CLEAR_EVENT,
+        new SonarReceiver() {
+          @Override
+          public void onReceive(SonarObject params, SonarResponder responder) throws Exception {
+            leakList.clear();
+          }
+        });
+  }
+
+  @Override
+  public void onDisconnect() throws Exception {
+    mConnection = null;
+  }
+
+  private void sendLeakList() {
+    if (mConnection != null) {
+      JSONObject obj = new JSONObject();
+      try {
+        obj.put(LEAKS_KEY, new JSONArray(leakList));
+        mConnection.send(REPORT_LEAK_EVENT, new SonarObject(obj));
+      } catch (JSONException e) {
+        Log.w(TAG, "Failure to serialize leak list: ", e);
+      }
+    }
+  }
+
+  public void reportLeak(String leakInfo) {
+    leakList.add(leakInfo);
+    sendLeakList();
+  }
+}

android/src/main/java/com/facebook/sonar/plugins/leakcanary/RecordLeakService.java

@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+package com.facebook.sonar.plugins.leakcanary;
+
+import static com.squareup.leakcanary.LeakCanary.leakInfo;
+
+import com.facebook.sonar.android.AndroidSonarClient;
+import com.facebook.sonar.core.SonarClient;
+import com.squareup.leakcanary.AbstractAnalysisResultService;
+import com.squareup.leakcanary.AnalysisResult;
+import com.squareup.leakcanary.HeapDump;
+
+/**
+ * When a leak is detected, sends results to connected Sonar desktop app. In order to use this
+ * service in place of the default, a custom RefWatcher will need to be created See
+ * https://github.com/square/leakcanary/wiki/Customizing-LeakCanary#uploading-to-a-server
+ */
+public class RecordLeakService extends AbstractAnalysisResultService {
+  @Override
+  protected void onHeapAnalyzed(HeapDump heapDump, AnalysisResult result) {
+    final String leakInfo = leakInfo(this, heapDump, result, true);
+    final SonarClient client = AndroidSonarClient.getInstance(this);
+
+    if (client != null) {
+      final LeakCanarySonarPlugin plugin = client.getPlugin("LeakCanary");
+      if (plugin != null) {
+        plugin.reportLeak(leakInfo);
+      }
+    }
+  }
+}

build.gradle

@@ -66,6 +66,7 @@ ext.deps = [
         junit              : 'junit:junit:4.12',
         stetho             : 'com.facebook.stetho:stetho:1.5.0',
         okhttp3            : 'com.squareup.okhttp3:okhttp:3.10.0',
+        leakcanary         : 'com.squareup.leakcanary:leakcanary-android:1.6.1',
         // Plugin dependencies
         rhino              : 'org.mozilla:rhino:1.7.10',
 ]