Coverage for airflow/utils/db.py : 25%

# -*- coding: utf-8 -*- 

# 

# 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 absolute_import 

from __future__ import division 

from __future__ import print_function 

from __future__ import unicode_literals 

from functools import wraps 

import logging 

import os 

from alembic.config import Config 

from alembic import command 

from alembic.migration import MigrationContext 

from sqlalchemy import event, exc 

from sqlalchemy.pool import Pool 

from airflow import settings 

from airflow import configuration 

def provide_session(func): 

""" 

Function decorator that provides a session if it isn't provided. 

If you want to reuse a session or run the function as part of a 

database transaction, you pass it to the function, if not this wrapper 

will create one and close it for you. 

""" 

@wraps(func) 

def wrapper(*args, **kwargs): 

needs_session = False 

arg_session = 'session' 

func_params = func.__code__.co_varnames 

session_in_args = arg_session in func_params and \ 

func_params.index(arg_session) < len(args) 

if not (arg_session in kwargs or session_in_args): 

needs_session = True 

session = settings.Session() 

kwargs[arg_session] = session 

result = func(*args, **kwargs) 

if needs_session: 

session.expunge_all() 

session.commit() 

session.close() 

return result 

return wrapper 

def pessimistic_connection_handling(): 

@event.listens_for(Pool, "checkout") 

def ping_connection(dbapi_connection, connection_record, connection_proxy): 

''' 

Disconnect Handling - Pessimistic, taken from: 

http://docs.sqlalchemy.org/en/rel_0_9/core/pooling.html 

''' 

cursor = dbapi_connection.cursor() 

try: 

cursor.execute("SELECT 1") 

except: 

raise exc.DisconnectionError() 

cursor.close() 

@provide_session 

def merge_conn(conn, session=None): 

from airflow import models 

C = models.Connection 

if not session.query(C).filter(C.conn_id == conn.conn_id).first(): 

session.add(conn) 

session.commit() 

@event.listens_for(settings.engine, "connect") 

def connect(dbapi_connection, connection_record): 

connection_record.info['pid'] = os.getpid() 

@event.listens_for(settings.engine, "checkout") 

def checkout(dbapi_connection, connection_record, connection_proxy): 

pid = os.getpid() 

if connection_record.info['pid'] != pid: 

connection_record.connection = connection_proxy.connection = None 

raise exc.DisconnectionError( 

"Connection record belongs to pid {}, " 

"attempting to check out in pid {}".format( 

connection_record.info['pid'], pid)) 

def initdb(): 

session = settings.Session() 

from airflow import models 

upgradedb() 

merge_conn( 

models.Connection( 

conn_id='airflow_db', conn_type='mysql', 

host='localhost', login='root', password='', 

schema='airflow')) 

merge_conn( 

models.Connection( 

conn_id='airflow_ci', conn_type='mysql', 

host='localhost', login='root', 

schema='airflow_ci')) 

merge_conn( 

models.Connection( 

conn_id='beeline_default', conn_type='beeline', port="10000", 

host='localhost', extra="{\"use_beeline\": true, \"auth\": \"\"}", 

schema='default')) 

merge_conn( 

models.Connection( 

conn_id='bigquery_default', conn_type='bigquery')) 

merge_conn( 

models.Connection( 

conn_id='local_mysql', conn_type='mysql', 

host='localhost', login='airflow', password='airflow', 

schema='airflow')) 

merge_conn( 

models.Connection( 

conn_id='presto_default', conn_type='presto', 

host='localhost', 

schema='hive', port=3400)) 

merge_conn( 

models.Connection( 

conn_id='hive_cli_default', conn_type='hive_cli', 

schema='default',)) 

merge_conn( 

models.Connection( 

conn_id='hiveserver2_default', conn_type='hiveserver2', 

host='localhost', 

schema='default', port=10000)) 

merge_conn( 

models.Connection( 

conn_id='metastore_default', conn_type='hive_metastore', 

host='localhost', extra="{\"authMechanism\": \"PLAIN\"}", 

port=9083)) 

merge_conn( 

models.Connection( 

conn_id='mysql_default', conn_type='mysql', 

login='root', 

host='localhost')) 

merge_conn( 

models.Connection( 

conn_id='postgres_default', conn_type='postgres', 

login='postgres', 

schema='airflow', 

host='localhost')) 

merge_conn( 

models.Connection( 

conn_id='sqlite_default', conn_type='sqlite', 

host='/tmp/sqlite_default.db')) 

merge_conn( 

models.Connection( 

conn_id='http_default', conn_type='http', 

host='https://www.google.com/')) 

merge_conn( 

models.Connection( 

conn_id='mssql_default', conn_type='mssql', 

host='localhost', port=1433)) 

merge_conn( 

models.Connection( 

conn_id='vertica_default', conn_type='vertica', 

host='localhost', port=5433)) 

merge_conn( 

models.Connection( 

conn_id='webhdfs_default', conn_type='hdfs', 

host='localhost', port=50070)) 

merge_conn( 

models.Connection( 

conn_id='ssh_default', conn_type='ssh', 

host='localhost')) 

merge_conn( 

models.Connection( 

conn_id='fs_default', conn_type='fs', 

extra='{"path": "/"}')) 

# Known event types 

KET = models.KnownEventType 

if not session.query(KET).filter(KET.know_event_type == 'Holiday').first(): 

session.add(KET(know_event_type='Holiday')) 

if not session.query(KET).filter(KET.know_event_type == 'Outage').first(): 

session.add(KET(know_event_type='Outage')) 

if not session.query(KET).filter( 

KET.know_event_type == 'Natural Disaster').first(): 

session.add(KET(know_event_type='Natural Disaster')) 

if not session.query(KET).filter( 

KET.know_event_type == 'Marketing Campaign').first(): 

session.add(KET(know_event_type='Marketing Campaign')) 

session.commit() 

models.DagBag(sync_to_db=True) 

Chart = models.Chart 

chart_label = "Airflow task instance by type" 

chart = session.query(Chart).filter(Chart.label == chart_label).first() 

if not chart: 

chart = Chart( 

label=chart_label, 

conn_id='airflow_db', 

chart_type='bar', 

x_is_date=False, 

sql=( 

"SELECT state, COUNT(1) as number " 

"FROM task_instance " 

"WHERE dag_id LIKE 'example%' " 

"GROUP BY state"), 

) 

session.add(chart) 

session.commit() 

def upgradedb(): 

logging.info("Creating tables") 

current_dir = os.path.dirname(os.path.abspath(__file__)) 

package_dir = os.path.normpath(os.path.join(current_dir, '..')) 

directory = os.path.join(package_dir, 'migrations') 

config = Config(os.path.join(package_dir, 'alembic.ini')) 

config.set_main_option('script_location', directory) 

config.set_main_option('sqlalchemy.url', 

configuration.get('core', 'SQL_ALCHEMY_CONN')) 

command.upgrade(config, 'heads') 

def resetdb(): 

''' 

Clear out the database 

''' 

from airflow import models 

logging.info("Dropping tables that exist") 

models.Base.metadata.drop_all(settings.engine) 

mc = MigrationContext.configure(settings.engine) 

if mc._version.exists(settings.engine): 

mc._version.drop(settings.engine) 

initdb()