web: Add data model using SQLAlchemy

.gitignore

@@ -3,3 +3,4 @@
 __pycache__/
 *.py[co]
 *.ini
+*.sqlite

setup.py

@@ -12,5 +12,6 @@ setup(
     package_dir={'': 'src'},
     install_requires=[
         'Milla>=0.3',
+        'SQLAlchemy',
     ],
 )

src/rouse/web/__main__.py

@@ -0,0 +1,37 @@
+from . import model
+import argparse
+import milla.util
+import sqlalchemy
+
+
+def createdb(args):
+    config = milla.util.read_config(args.config)
+    engine = sqlalchemy.engine_from_config(config, 'sqlalchemy.')
+    engine.echo = not args.quiet
+    session = model.Session(bind=engine)
+    model.Base.metadata.create_all(session.bind)
+    session.commit()
+    session.close()
+    session.bind.dispose()
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(prog=__package__)
+    sp = parser.add_subparsers(metavar='command')
+    sp.required = True
+    p_createdb = sp.add_parser('createdb',
+                               help='Create initial database schema')
+    p_createdb.add_argument('--quiet', '-q', action='store_true',
+                            default=False,
+                            help='Do not print issued SQL')
+    p_createdb.add_argument('config', help='Path to configuration file')
+    p_createdb.set_defaults(func=createdb)
+    return parser.parse_args()
+
+
+def main():
+    args = parse_args()
+    args.func(args)
+
+
+main()

src/rouse/web/model.py

@@ -0,0 +1,35 @@
+from __future__ import unicode_literals
+from sqlalchemy import schema, types, orm
+from sqlalchemy.ext import declarative
+
+
+Base = declarative.declarative_base()
+
+Session = orm.session.sessionmaker()
+
+
+# pylint: disable=too-few-public-methods
+
+class Serializable(object):
+
+    def to_json(self):
+        data = {}
+        for attr in self.__table__.columns.keys():
+            if attr.startswith('_'):
+                continue
+            value = getattr(self, attr)
+            if attr.endswith('_'):
+                data[attr[:-1]] = value
+            else:
+                data[attr] = value
+        return data
+
+
+class Host(Base, Serializable):
+
+    __tablename__ = 'hosts'
+
+    id = schema.Column(types.Integer, autoincrement=True, primary_key=True)
+    macaddr = schema.Column(types.String(18), nullable=False)
+    ipaddr = schema.Column(types.String(46))
+    hostname = schema.Column(types.Unicode(253))