ExceptionHandler to catch known GPRC bug while we wait for an upstream fix

android/src/main/java/com/pylon/RNSpokestack/ExceptionHandler.java

@@ -0,0 +1,37 @@
+package com.pylon.RNSpokestack;
+
+import android.content.Context;
+import android.util.Log;
+
+/* Our very own exception handler for all threads with us as the parent process.
+ * https://github.com/googleapis/google-cloud-java/issues/4727 necessitates this.
+ * Hence we silently swallow the specific exception, and let the default exception handler
+ * do its thing otherwise.
+ */
+public class ExceptionHandler implements Thread.UncaughtExceptionHandler {
+
+  private Context context;
+  private Thread.UncaughtExceptionHandler rootHandler;
+
+  public GlobalExceptionHandler(Context context) {
+    this.context = context;
+    this.rootHandler = Thread.getDefaultUncaughtExceptionHandler();
+    Thread.setDefaultUncaughtExceptionHandler(this);
+  }
+
+  /* The specific exception to ignore stems from grpc-okhttp-1, which is present in google-cloud-speech 0.84.0-beta.
+   * https://github.com/grpc/grpc-java/blob/master/okhttp/src/main/java/io/grpc/okhttp/OkHttpClientTransport.java#L933
+   */
+  @Override
+  public void uncaughtException(final Thread thread, final Throwable ex) {
+    if (this.rootHandler != null && ex instanceof java.util.concurrent.RejectedExecutionException) {
+      Log.i("react-native-spokestack","ignoring known exception: " + ex.toString());
+    } else if (this.rootHandler != null) {
+      this.rootHandler.uncaughtException(thread, ex);
+    } else {
+      Log.e("react-native-spokestack","no root handlerfor uncaught exception, killing process and exiting.");
+      android.os.Process.killProcess(android.os.Process.myPid());
+      System.exit(0);
+    }
+  }
+}