Add Firestore reactive sample

functions/firebase/main.py

@@ -20,6 +20,10 @@
 # [END functions_firebase_firestore]
 # [END functions_firebase_auth]
 
+# [START functions_firebase_reactive]
+from google.cloud import firestore
+# [END functions_firebase_reactive]
+
 
 # [START functions_firebase_rtdb]
 def hello_rtdb(data, context):
@@ -69,3 +73,25 @@ def hello_auth(data, context):
     if 'email' in data:
         print('Email: %s' % data["email"])
 # [END functions_firebase_auth]
+
+
+# [START functions_firebase_reactive]
+client = firestore.Client()
+
+
+# Converts strings added to /messages/{pushId}/original to uppercase
+def make_upper_case(data, context):
+    path_parts = context.resource.split('/documents/')[1].split('/')
+    collection_path = path_parts[0]
+    document_path = '/'.join(path_parts[1:])
+
+    affected_doc = client.collection(collection_path).document(document_path)
+
+    cur_value = data["value"]["fields"]["original"]["stringValue"]
+    new_value = cur_value.upper()
+    print(f'Replacing value: {cur_value} --> {new_value}')
+
+    affected_doc.set({
+        u'original': new_value
+    })
+# [END functions_firebase_reactive]

functions/firebase/main_test.py

@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from collections import UserDict
 from datetime import datetime
 import json
-
 import uuid
 
+from mock import MagicMock, patch
+
 import main
 
 
@@ -83,3 +85,40 @@ def test_auth(capsys):
     assert user_id in out
     assert date_string in out
     assert email_string in out
+
+
+@patch('main.client')
+def test_make_upper_case(firestore_mock, capsys):
+
+    firestore_mock.collection = MagicMock(return_value=firestore_mock)
+    firestore_mock.document = MagicMock(return_value=firestore_mock)
+    firestore_mock.set = MagicMock(return_value=firestore_mock)
+
+    user_id = str(uuid.uuid4())
+    date_string = datetime.now().isoformat()
+    email_string = '%s@%s.com' % (uuid.uuid4(), uuid.uuid4())
+
+    data = {
+        'uid': user_id,
+        'metadata': {'createdAt': date_string},
+        'email': email_string,
+        'value': {
+            'fields': {
+                'original': {
+                    'stringValue': 'foobar'
+                }
+            }
+        }
+    }
+
+    context = UserDict()
+    context.resource = '/documents/some_collection/path/some/path'
+
+    main.make_upper_case(data, context)
+
+    out, _ = capsys.readouterr()
+
+    assert 'Replacing value: foobar --> FOOBAR' in out
+    firestore_mock.collection.assert_called_with('some_collection')
+    firestore_mock.document.assert_called_with('path/some/path')
+    firestore_mock.set.assert_called_with({'original': 'FOOBAR'})

functions/firebase/requirements.txt

@@ -0,0 +1 @@
+google-cloud-firestore==0.29.0