[functions][android] add support for multiple firebase apps and specifying a function region

android/build.gradle

@@ -103,8 +103,8 @@ dependencies {
   compileOnly "com.google.firebase:firebase-core:16.0.1"
   compileOnly "com.google.firebase:firebase-crash:16.0.1"
   compileOnly "com.google.firebase:firebase-database:16.0.1"
-  compileOnly "com.google.firebase:firebase-firestore:17.0.2"
-  compileOnly "com.google.firebase:firebase-functions:16.0.1"
+  compileOnly "com.google.firebase:firebase-firestore:17.0.4"
+  compileOnly "com.google.firebase:firebase-functions:16.1.0"
   compileOnly "com.google.firebase:firebase-invites:16.0.1"
   compileOnly "com.google.firebase:firebase-storage:16.0.1"
   compileOnly "com.google.firebase:firebase-messaging:17.1.0"

android/src/main/java/io/invertase/firebase/functions/RNFirebaseFunctions.java

@@ -5,14 +5,14 @@ import android.util.Log;
 
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.Promise;
-import com.facebook.react.bridge.ReactMethod;
-import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
-
+import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.WritableMap;
 import com.google.android.gms.tasks.OnFailureListener;
 import com.google.android.gms.tasks.OnSuccessListener;
+import com.google.firebase.FirebaseApp;
 import com.google.firebase.functions.FirebaseFunctions;
 import com.google.firebase.functions.FirebaseFunctionsException;
 import com.google.firebase.functions.HttpsCallableReference;
@@ -39,17 +39,56 @@ public class RNFirebaseFunctions extends ReactContextBaseJavaModule {
     return TAG;
   }
 
+  /**
+   * Changes this instance to point to a Cloud Functions emulator running
+   * locally.
+   * <p>
+   * See https://firebase.google.com/docs/functions/local-emulator
+   *
+   * @param origin  the origin string of the local emulator started via firebase tools
+   *                "http://10.0.0.8:1337".
+   * @param appName
+   * @param region
+   * @param origin
+   * @param promise
+   */
   @ReactMethod
-  public void httpsCallable(final String name, ReadableMap wrapper, final Promise promise) {
+  public void useFunctionsEmulator(
+    String appName,
+    String region,
+    String origin,
+    Promise promise
+  ) {
+    FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
+    FirebaseFunctions functionsInstance = FirebaseFunctions.getInstance(firebaseApp, region);
+    functionsInstance.useFunctionsEmulator(origin);
+    promise.resolve(null);
+  }
+
+  /**
+   * @param appName
+   * @param region
+   * @param name
+   * @param wrapper
+   * @param promise
+   */
+  @ReactMethod
+  public void httpsCallable(
+    String appName,
+    String region,
+    final String name,
+    ReadableMap wrapper,
+    final Promise promise
+  ) {
     Object input = wrapper
       .toHashMap()
       .get(DATA_KEY);
 
     Log.d(TAG, "function:call:input:" + name + ":" + (input != null ? input.toString() : "null"));
 
-    HttpsCallableReference httpsCallableReference = FirebaseFunctions
-      .getInstance()
-      .getHttpsCallable(name);
+    FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
+    FirebaseFunctions functionsInstance = FirebaseFunctions.getInstance(firebaseApp, region);
+    HttpsCallableReference httpsCallableReference = functionsInstance.getHttpsCallable(name);
 
     httpsCallableReference
       .call(input)
@@ -96,9 +135,9 @@ public class RNFirebaseFunctions extends ReactContextBaseJavaModule {
             code = ffe
               .getCode()
               .name();
-            message = ffe.getLocalizedMessage();
+            message = ffe.getMessage();
           } else {
-            message = exception.getLocalizedMessage();
+            message = exception.getMessage();
           }
 
           Utils.mapPutValue(CODE_KEY, code, map);

bridge/android/app/build.gradle

@@ -100,8 +100,8 @@ dependencies {
   implementation "com.google.firebase:firebase-auth:16.0.2"
   implementation "com.google.firebase:firebase-config:16.0.0"
   implementation "com.google.firebase:firebase-database:16.0.1"
-  implementation "com.google.firebase:firebase-firestore:17.0.2"
-  implementation "com.google.firebase:firebase-functions:16.0.1"
+  implementation "com.google.firebase:firebase-firestore:17.0.4"
+  implementation "com.google.firebase:firebase-functions:16.1.0"
   implementation "com.google.firebase:firebase-invites:16.0.1"
   implementation "com.google.firebase:firebase-storage:16.0.1"
   implementation "com.google.firebase:firebase-messaging:17.1.0"