Add local dc property (#312)

* add local dc property

* update version

butterfree/configs/db/cassandra_config.py

@@ -43,6 +43,7 @@ def __init__(
         stream_checkpoint_path: str = None,
         read_consistency_level: str = None,
         write_consistency_level: str = None,
+        local_dc: str = None,
     ):
         self.username = username
         self.password = password
@@ -55,6 +56,7 @@ def __init__(
         self.stream_checkpoint_path = stream_checkpoint_path
         self.read_consistency_level = read_consistency_level
         self.write_consistency_level = write_consistency_level
+        self.local_dc = local_dc
 
     @property
     def database(self) -> str:
@@ -178,6 +180,15 @@ def write_consistency_level(self, value: str) -> None:
             "CASSANDRA_WRITE_CONSISTENCY_LEVEL", "LOCAL_QUORUM"
         )
 
+    @property
+    def local_dc(self) -> Optional[str]:
+        """Local DC for Cassandra connection."""
+        return self.__local_dc
+
+    @local_dc.setter
+    def local_dc(self, value: str) -> None:
+        self.__local_dc = value or environment.get_variable("CASSANDRA_LOCAL_DC")
+
     def get_options(self, table: str) -> Dict[Optional[str], Optional[str]]:
         """Get options for connect to Cassandra DB.
 
@@ -197,6 +208,7 @@ def get_options(self, table: str) -> Dict[Optional[str], Optional[str]]:
             "spark.cassandra.auth.username": self.username,
             "spark.cassandra.auth.password": self.password,
             "spark.cassandra.connection.host": self.host,
+            "spark.cassandra.connection.localDC": self.local_dc,
             "spark.cassandra.input.consistency.level": self.read_consistency_level,
             "spark.cassandra.output.consistency.level": self.write_consistency_level,
         }

butterfree/configs/environment.py

@@ -14,6 +14,7 @@
     "STREAM_CHECKPOINT_PATH": None,
     "CASSANDRA_READ_CONSISTENCY_LEVEL": None,
     "CASSANDRA_WRITE_CONSISTENCY_LEVEL": None,
+    "CASSANDRA_LOCAL_DC": None,
 }
 
 

setup.py

@@ -1,7 +1,7 @@
 from setuptools import find_packages, setup
 
 __package_name__ = "butterfree"
-__version__ = "1.2.0.dev10"
+__version__ = "1.2.0.dev11"
 __repository_url__ = "https://github.com/quintoandar/butterfree"
 
 with open("requirements.txt") as f:

tests/unit/butterfree/configs/db/test_cassandra_config.py

@@ -203,6 +203,28 @@ def test_write_consistency_level_custom_env_var(self, mocker, cassandra_config):
         # then
         assert cassandra_config.write_consistency_level == value
 
+    def test_local_dc(self, cassandra_config):
+        # expecting
+        default = None
+        assert cassandra_config.local_dc == default
+
+    def test_local_dc_custom(self, cassandra_config):
+        # given
+        value = "VPC_1"
+        cassandra_config.local_dc = value
+
+        # then
+        assert cassandra_config.local_dc == value
+
+    def test_local_dc_custom_env_var(self, mocker, cassandra_config):
+        # given
+        value = "VPC_1"
+        mocker.patch("butterfree.configs.environment.get_variable", return_value=value)
+        cassandra_config.local_dc = value
+
+        # then
+        assert cassandra_config.local_dc == value
+
     def test_set_credentials_on_instantiation(self):
         cassandra_config = CassandraConfig(  # noqa: S106
             username="username", password="password", host="host", keyspace="keyspace"