8 files changed, 329 insertions, 0 deletions
diff --git a/apigateway/apigateway/db/__init__.py b/apigateway/apigateway/db/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/apigateway/apigateway/db/__init__.py
diff --git a/apigateway/apigateway/db/api.py b/apigateway/apigateway/db/api.py
new file mode 100644
index 0000000..908a99b
--- /dev/null
+++ b/apigateway/apigateway/db/api.py
@@ -0,0 +1,77 @@
+#
+#    Licensed 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.
+
+from sqlalchemy import create_engine
+import sqlalchemy.orm
+from sqlalchemy.orm import exc
+
+from apigateway.db import models as db_models
+
+
+_ENGINE = None
+_SESSION_MAKER = None
+
+
+def get_engine():
+    global _ENGINE
+    if _ENGINE is not None:
+        return _ENGINE
+
+    _ENGINE = create_engine('sqlite:///webdemo.db')
+    return _ENGINE
+
+
+def get_session_maker(engine):
+    global _SESSION_MAKER
+    if _SESSION_MAKER is not None:
+        return _SESSION_MAKER
+
+    _SESSION_MAKER = sqlalchemy.orm.sessionmaker(bind=engine)
+    return _SESSION_MAKER
+
+
+def get_session():
+    engine = get_engine()
+    maker = get_session_maker(engine)
+    session = maker()
+
+    return session
+
+
+class Connection(object):
+
+    def __init__(self):
+        pass
+
+    def get_user(self, user_id):
+        query = get_session().query(db_models.User).filter_by(user_id=user_id)
+        try:
+            user = query.one()
+        except exc.NoResultFound:
+            # TODO(developer): process this situation
+            pass
+
+        return user
+
+    def list_users(self):
+        session = get_session()
+        query = session.query(db_models.User)
+        users = query.all()
+
+        return users
+
+    def update_user(self, user):
+        pass
+
+    def delete_user(self, user):
+        pass
diff --git a/apigateway/apigateway/db/models.py b/apigateway/apigateway/db/models.py
new file mode 100644
index 0000000..96fba77
--- /dev/null
+++ b/apigateway/apigateway/db/models.py
@@ -0,0 +1,32 @@
+#
+#    Licensed 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.
+
+from sqlalchemy import Column, Integer, String
+from sqlalchemy.ext import declarative
+from sqlalchemy import Index
+
+
+Base = declarative.declarative_base()
+
+
+class User(Base):
+    """User table"""
+
+    __tablename__ = 'user'
+    __table_args__ = (
+        Index('ix_user_user_id', 'user_id'),
+    )
+    id = Column(Integer, primary_key=True)
+    user_id = Column(String(255), nullable=False)
+    name = Column(String(64), nullable=False, unique=True)
+    email = Column(String(255))
diff --git a/apigateway/apigateway/db/sqlalchemy/alembic.ini b/apigateway/apigateway/db/sqlalchemy/alembic.ini
new file mode 100644
index 0000000..63fd682
--- /dev/null
+++ b/apigateway/apigateway/db/sqlalchemy/alembic.ini
@@ -0,0 +1,69 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# max length of characters to apply to the
+# "slug" field
+#truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to alembic/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat alembic/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# sqlalchemy.url = driver://user:pass@localhost/dbname
+sqlalchemy.url = sqlite:///../../../parser.db
+
+
+# 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
diff --git a/apigateway/apigateway/db/sqlalchemy/alembic/README b/apigateway/apigateway/db/sqlalchemy/alembic/README
new file mode 100644
index 0000000..98e4f9c
--- /dev/null
+++ b/apigateway/apigateway/db/sqlalchemy/alembic/README
@@ -0,0 +1 @@
+Generic single-database configuration.
+\ No newline at end of file
diff --git a/apigateway/apigateway/db/sqlalchemy/alembic/env.py b/apigateway/apigateway/db/sqlalchemy/alembic/env.py
new file mode 100644
index 0000000..c1d6706
--- /dev/null
+++ b/apigateway/apigateway/db/sqlalchemy/alembic/env.py
@@ -0,0 +1,83 @@
+#
+#    Licensed 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.
+
+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+
+# 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)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = None
+
+# 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, target_metadata=target_metadata, literal_binds=True)
+
+    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.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix='sqlalchemy.',
+        poolclass=pool.NullPool)
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/apigateway/apigateway/db/sqlalchemy/alembic/script.py.mako b/apigateway/apigateway/db/sqlalchemy/alembic/script.py.mako
new file mode 100644
index 0000000..43c0940
--- /dev/null
+++ b/apigateway/apigateway/db/sqlalchemy/alembic/script.py.mako
@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/apigateway/apigateway/db/sqlalchemy/alembic/versions/6acdba136829_create_user_table.py b/apigateway/apigateway/db/sqlalchemy/alembic/versions/6acdba136829_create_user_table.py
new file mode 100644
index 0000000..962e76a
--- /dev/null
+++ b/apigateway/apigateway/db/sqlalchemy/alembic/versions/6acdba136829_create_user_table.py
@@ -0,0 +1,43 @@
+#
+#    Licensed 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.
+
+"""Create user table
+
+Revision ID: 6acdba136829
+Revises:
+Create Date: 2017-01-22 9:18:09.967362
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '6acdba136829'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'user',
+        sa.Column('id', sa.Integer, primary_key=True),
+        sa.Column('user_id', sa.String(255), nullable=False),
+        sa.Column('name', sa.String(64), nullable=False, unique=True),
+        sa.Column('email', sa.String(255))
+    )
+
+
+def downgrade():
+    op.drop_table('user')