from google.cloud import firestore


# Initialization code, run prior to deploy.
# fs_client = firestore.Client()
# doc_ref = fs_client.collection("test").document("subtest")
# doc_ref.set({"hello": "world"})


def abort_now_listener(doc_snapshot, changes, read_time):
    for doc in doc_snapshot:
        doc_vals = doc.to_dict()
        print(doc_vals["hello"])


# gcloud functions deploy watch_fs --runtime python37 --trigger-http
def watch_fs(request):
    print("creating client")
    fs_client = firestore.Client()
    doc_ref = fs_client.collection("test").document("subtest")
    print(doc_ref)
    watcher = doc_ref.on_snapshot(abort_now_listener)
    print("after watcher")
    watcher.unsubscribe()
    print("the end!")
    return "hello world"