Docker support (#8725)

* Moving Docker stuff around

* docker-compose working as expected

* Updating README

* Addressing comments

* Utilizing requirements-extra

docker/pythonpath_dev/superset_config.py

@@ -0,0 +1,87 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+#
+# This file is included in the final Docker image and SHOULD be overridden when
+# deploying the image to prod. Settings configured here are intended for use in local
+# development environments. Also note that superset_config_docker.py is imported
+# as a final step as a means to override "defaults" configured here
+#
+
+import logging
+import os
+
+
+logger = logging.getLogger()
+
+
+def get_env_variable(var_name, default=None):
+    """Get the environment variable or raise exception."""
+    try:
+        return os.environ[var_name]
+    except KeyError:
+        if default is not None:
+            return default
+        else:
+            error_msg = "The environment variable {} was missing, abort...".format(
+                var_name
+            )
+            raise EnvironmentError(error_msg)
+
+
+POSTGRES_USER = get_env_variable("POSTGRES_USER")
+POSTGRES_PASSWORD = get_env_variable("POSTGRES_PASSWORD")
+POSTGRES_HOST = get_env_variable("POSTGRES_HOST")
+POSTGRES_PORT = get_env_variable("POSTGRES_PORT")
+POSTGRES_DB = get_env_variable("POSTGRES_DB")
+
+# The SQLAlchemy connection string.
+SQLALCHEMY_DATABASE_URI = "postgresql://%s:%s@%s:%s/%s" % (
+    POSTGRES_USER,
+    POSTGRES_PASSWORD,
+    POSTGRES_HOST,
+    POSTGRES_PORT,
+    POSTGRES_DB,
+)
+
+REDIS_HOST = get_env_variable("REDIS_HOST")
+REDIS_PORT = get_env_variable("REDIS_PORT")
+
+
+class CeleryConfig(object):
+    BROKER_URL = "redis://%s:%s/0" % (REDIS_HOST, REDIS_PORT)
+    CELERY_IMPORTS = ("superset.sql_lab",)
+    CELERY_RESULT_BACKEND = "redis://%s:%s/1" % (REDIS_HOST, REDIS_PORT)
+    CELERY_ANNOTATIONS = {"tasks.add": {"rate_limit": "10/s"}}
+    CELERY_TASK_PROTOCOL = 1
+
+
+CELERY_CONFIG = CeleryConfig
+
+#
+# Optionally import superset_config_docker.py (which will have been included on
+# the PYTHONPATH) in order to allow for local settings to be overridden
+#
+try:
+    from superset_config_docker import *  # noqa
+    import superset_config_docker
+
+    logger.info(
+        f"Loaded your Docker configuration at " f"[{superset_config_docker.__file__}]"
+    )
+except ImportError:
+    logger.info("Using default Docker config...")