Managing exceptions inside a coroutine.

suspendCoroutine.kt

suspend fun <T> Task<T>.await(): T = suspendCoroutine { continuation ->
  addOnCompleteListener { task ->
    when {
      (task.result as QuerySnapshot).metadata.isFromCache ->
        continuation.resumeWithException(Exception("without internet"))
      task.isSuccessful -> continuation.resume(task.result)
      else -> continuation.resumeWithException(task.exception!!)
    }
  }
}