#

# See LICENCE for detail

# Copyright (c) 2014 IRI

#

from sqlalchemy import create_engine, MetaData

from sqlalchemy.orm import scoped_session, sessionmaker

from sqlalchemy.ext.declarative import declarative_base

import psycopg2.extras

from twisted.python import log

from txpostgres.txpostgres import Connection, ConnectionPool

import config

engine = create_engine(config.CONN_STR, convert_unicode=True)

db_session = scoped_session(sessionmaker(autocommit=False,

                                         autoflush=False,

                                         bind=engine))

Base = declarative_base()

Base.query = db_session.query_property()

def init_db():

    # import all modules here that might define models so that

    # they will be registered properly on the metadata.  Otherwise

    # you will have to import them first before calling init_db()

    import models

    Base.metadata.create_all(bind=engine)

class DictConnection(Connection):

    @staticmethod

    def connectionFactory(*args, **kwargs):

        kwargs['connection_factory'] = psycopg2.extras.DictConnection

        return psycopg2.connect(*args, **kwargs)

class DictConnectionPool(ConnectionPool):

    connectionFactory = DictConnection

def create_connection_pool(conn_string):

    created_connection_pool = DictConnectionPool(None, conn_string)

    d = created_connection_pool.start()

    d.addErrback(log.err)

    return created_connection_pool, d