Setting up alembic

.gitignore

@@ -1,4 +1,5 @@
 *.pyc
+build
 *.db
 tmp
 panoramix_config.py

panoramix/__init__.py

@@ -1,6 +1,11 @@
 import logging
+import os
 from flask import Flask
 from flask.ext.appbuilder import SQLA, AppBuilder, IndexView
+from flask.ext.migrate import Migrate
+from panoramix import config
+
+APP_DIR = os.path.dirname(__file__)
 
 # Logging configuration
 logging.basicConfig(format='%(asctime)s:%(levelname)s:%(name)s:%(message)s')
@@ -9,6 +14,7 @@ logging.getLogger().setLevel(logging.DEBUG)
 app = Flask(__name__)
 app.config.from_object('panoramix.config')
 db = SQLA(app)
+migrate = Migrate(app, db, directory=APP_DIR + "/migrations")
 
 
 class MyIndexView(IndexView):
@@ -16,7 +22,8 @@ class MyIndexView(IndexView):
 
 appbuilder = AppBuilder(
     app, db.session, base_template='panoramix/base.html',
-    indexview=MyIndexView)
+    indexview=MyIndexView,
+    security_manager_class=config.CUSTOM_SECURITY_MANAGER)
 
 get_session = appbuilder.get_session
 from panoramix import views

panoramix/config.py

@@ -19,6 +19,8 @@ ROW_LIMIT = 50000
 WEBSERVER_THREADS = 8
 
 PANORAMIX_WEBSERVER_PORT = 8088
+
+CUSTOM_SECURITY_MANAGER = None
 # ---------------------------------------------------------
 
 # Your App secret key

panoramix/migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration.

panoramix/migrations/alembic.ini

@@ -0,0 +1,45 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

panoramix/migrations/env.py

@@ -0,0 +1,89 @@
+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+import logging
+from panoramix import db, models
+from flask.ext.appbuilder import Base
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+from flask import current_app
+config.set_main_option('sqlalchemy.url',
+                       current_app.config.get('SQLALCHEMY_DATABASE_URI'))
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.readthedocs.org/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    engine = engine_from_config(config.get_section(config.config_ini_section),
+                                prefix='sqlalchemy.',
+                                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(connection=connection,
+                      target_metadata=target_metadata,
+                      #compare_type=True,
+                      process_revision_directives=process_revision_directives,
+                      **current_app.extensions['migrate'].configure_args)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

panoramix/migrations/script.py.mako

@@ -0,0 +1,22 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

panoramix/models.py

@@ -8,6 +8,7 @@ from pydruid import client
 from pydruid.utils.filters import Dimension, Filter
 from sqlalchemy import (
     Column, Integer, String, ForeignKey, Text, Boolean, DateTime)
+from panoramix.utils import JSONEncodedDict
 from sqlalchemy import Table as sqlaTable
 from sqlalchemy import create_engine, MetaData, desc, select, and_
 from sqlalchemy.orm import relationship
@@ -27,6 +28,15 @@ import config
 QueryResult = namedtuple('namedtuple', ['df', 'query', 'duration'])
 
 
+class Slice(Model, AuditMixin):
+    """A slice is essentially a report or a view on data"""
+    __tablename__ = 'slices'
+    id = Column(Integer, primary_key=True)
+    params = Column(JSONEncodedDict)
+    datasource = Column(String(250))
+    viz_type = Column(String(250))
+
+
 class Queryable(object):
     @property
     def column_names(self):
@@ -44,7 +54,7 @@ class Queryable(object):
 class Database(Model, AuditMixin):
     __tablename__ = 'dbs'
     id = Column(Integer, primary_key=True)
-    database_name = Column(String(255), unique=True)
+    database_name = Column(String(250), unique=True)
     sqlalchemy_uri = Column(String(1024))
 
     def __repr__(self):
@@ -406,7 +416,7 @@ class TableColumn(Model, AuditMixin):
 class Cluster(Model, AuditMixin):
     __tablename__ = 'clusters'
     id = Column(Integer, primary_key=True)
-    cluster_name = Column(String(255), unique=True)
+    cluster_name = Column(String(250), unique=True)
     coordinator_host = Column(String(256))
     coordinator_port = Column(Integer)
     coordinator_endpoint = Column(String(256))
@@ -441,7 +451,7 @@ class Datasource(Model, AuditMixin, Queryable):
 
     __tablename__ = 'datasources'
     id = Column(Integer, primary_key=True)
-    datasource_name = Column(String(255), unique=True)
+    datasource_name = Column(String(250), unique=True)
     is_featured = Column(Boolean, default=False)
     is_hidden = Column(Boolean, default=False)
     description = Column(Text)
@@ -655,7 +665,7 @@ class Metric(Model):
     verbose_name = Column(String(1024))
     metric_type = Column(String(32))
     datasource_name = Column(
-        String(256),
+        String(250),
         ForeignKey('datasources.datasource_name'))
     datasource = relationship('Datasource', backref='metrics')
     json = Column(Text)
@@ -674,7 +684,7 @@ class Column(Model, AuditMixin):
     __tablename__ = 'columns'
     id = Column(Integer, primary_key=True)
     datasource_name = Column(
-        String(256),
+        String(250),
         ForeignKey('datasources.datasource_name'))
     datasource = relationship('Datasource', backref='columns')
     column_name = Column(String(256))

panoramix/utils.py

@@ -1,4 +1,6 @@
 from datetime import datetime
+from sqlalchemy.types import TypeDecorator, TEXT
+import json
 import parsedatetime
 
 
@@ -33,3 +35,19 @@ def parse_human_timedelta(s):
     d = datetime(
         d.tm_year, d.tm_mon, d.tm_mday, d.tm_hour, d.tm_min, d.tm_sec)
     return d - dttm
+
+
+
+class JSONEncodedDict(TypeDecorator):
+    """Represents an immutable structure as a json-encoded string."""
+    impl = TEXT
+    def process_bind_param(self, value, dialect):
+        if value is not None:
+            value = json.dumps(value)
+
+        return value
+
+    def process_result_value(self, value, dialect):
+        if value is not None:
+            value = json.loads(value)
+        return value

panoramix/views.py

@@ -262,5 +262,3 @@ appbuilder.add_link(
     category='Admin',
     category_icon='fa-cogs',
     icon="fa-cog")
-
-db.create_all()

requirements.txt

@@ -1,5 +1,5 @@
 flask
-flask-alembic
+flask-migrate
 flask-appbuilder
 gunicorn
 mysql-python

setup.py

@@ -9,13 +9,13 @@ setup(
         "and druid.io"),
     version=version,
     packages=find_packages(),
-    package_data={'': ['panoramix/alembic.ini']},
+    package_data={'': ['panoramix/migrations/alembic.ini']},
     include_package_data=True,
     zip_safe=False,
     scripts=['panoramix/bin/panoramix'],
     install_requires=[
         'flask-appbuilder>=1.4.5',
-        'flask-alembic>=1.2.1',
+        'flask-migrate>=1.5.1',
         'gunicorn>=19.3.0',
         'pandas>=0.16.2',
         'pydruid>=0.2.2',