[AIRFLOW-3343] Update DockerOperator for Docker-py 3.0.0 API changes (#4187)

The API of `wait()` changed to return a dict, not just a number so this
Operator wasn't actually working, but the tests were passing because the
return was mocked in-correctly.

I also removed `shm_size` from kwargs passed to BaseOperator to avoid
the deprecation warning about unknown args.

airflow/operators/docker_operator.py

@@ -108,6 +108,9 @@ class DockerOperator(BaseOperator):
     :type xcom_all: bool
     :param docker_conn_id: ID of the Airflow connection to use
     :type docker_conn_id: str
+    :param shm_size: Size of ``/dev/shm`` in bytes. The size must be
+        greater than 0. If omitted uses system default.
+    :type shm_size: int
     """
     template_fields = ('command', 'environment',)
     template_ext = ('.sh', '.bash',)
@@ -139,6 +142,7 @@ class DockerOperator(BaseOperator):
             dns=None,
             dns_search=None,
             auto_remove=False,
+            shm_size=None,
             *args,
             **kwargs):
 
@@ -167,7 +171,7 @@ class DockerOperator(BaseOperator):
         self.xcom_push_flag = xcom_push
         self.xcom_all = xcom_all
         self.docker_conn_id = docker_conn_id
-        self.shm_size = kwargs.get('shm_size')
+        self.shm_size = shm_size
 
         self.cli = None
         self.container = None
@@ -197,7 +201,7 @@ class DockerOperator(BaseOperator):
         if self.force_pull or len(self.cli.images(name=self.image)) == 0:
             self.log.info('Pulling docker image %s', self.image)
             for l in self.cli.pull(self.image, stream=True):
-                output = json.loads(l.decode('utf-8'))
+                output = json.loads(l.decode('utf-8').strip())
                 if 'status' in output:
                     self.log.info("%s", output['status'])
 
@@ -230,9 +234,9 @@ class DockerOperator(BaseOperator):
                     line = line.decode('utf-8')
                 self.log.info(line)
 
-            exit_code = self.cli.wait(self.container['Id'])
-            if exit_code != 0:
-                raise AirflowException('docker container failed')
+            result = self.cli.wait(self.container['Id'])
+            if result['StatusCode'] != 0:
+                raise AirflowException('docker container failed: ' + repr(result))
 
             if self.xcom_push_flag:
                 return self.cli.logs(container=self.container['Id']) \

setup.py

@@ -174,7 +174,7 @@ doc = [
     'sphinx-rtd-theme>=0.1.6',
     'Sphinx-PyPI-upload>=0.2.1'
 ]
-docker = ['docker>=3.0.0']
+docker = ['docker~=3.0']
 druid = ['pydruid>=0.4.1']
 elasticsearch = [
     'elasticsearch>=5.0.0,<6.0.0',

tests/operators/test_docker_operator.py

@@ -51,7 +51,7 @@ class DockerOperatorTestCase(unittest.TestCase):
         client_mock.images.return_value = []
         client_mock.logs.return_value = ['container log']
         client_mock.pull.return_value = [b'{"status":"pull log"}']
-        client_mock.wait.return_value = 0
+        client_mock.wait.return_value = {"StatusCode": 0}
 
         client_class_mock.return_value = client_mock
 
@@ -97,7 +97,7 @@ class DockerOperatorTestCase(unittest.TestCase):
         client_mock.images.return_value = []
         client_mock.logs.return_value = []
         client_mock.pull.return_value = []
-        client_mock.wait.return_value = 0
+        client_mock.wait.return_value = {"StatusCode": 0}
 
         client_class_mock.return_value = client_mock
         tls_mock = mock.Mock()
@@ -123,7 +123,7 @@ class DockerOperatorTestCase(unittest.TestCase):
         client_mock.images.return_value = []
         client_mock.logs.return_value = ['unicode container log 😁']
         client_mock.pull.return_value = []
-        client_mock.wait.return_value = 0
+        client_mock.wait.return_value = {"StatusCode": 0}
 
         client_class_mock.return_value = client_mock
 
@@ -145,7 +145,7 @@ class DockerOperatorTestCase(unittest.TestCase):
         client_mock.images.return_value = []
         client_mock.logs.return_value = []
         client_mock.pull.return_value = []
-        client_mock.wait.return_value = 1
+        client_mock.wait.return_value = {"StatusCode": 1}
 
         client_class_mock.return_value = client_mock
 
@@ -174,7 +174,7 @@ class DockerOperatorTestCase(unittest.TestCase):
         client_mock.create_container.return_value = {'Id': 'some_id'}
         client_mock.logs.return_value = []
         client_mock.pull.return_value = []
-        client_mock.wait.return_value = 0
+        client_mock.wait.return_value = {"StatusCode": 0}
         operator_client_mock.return_value = client_mock
 
         # Create the DockerOperator
@@ -209,7 +209,7 @@ class DockerOperatorTestCase(unittest.TestCase):
         client_mock.create_container.return_value = {'Id': 'some_id'}
         client_mock.logs.return_value = []
         client_mock.pull.return_value = []
-        client_mock.wait.return_value = 0
+        client_mock.wait.return_value = {"StatusCode": 0}
         operator_client_mock.return_value = client_mock
 
         # Create the DockerOperator