lemur/lemur/factory.py

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"""
.. module: lemur.factory
:platform: Unix
:synopsis: This module contains all the needed functions to allow
the factory app creation.
:copyright: (c) 2018 by Netflix Inc., see AUTHORS for more
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:license: Apache, see LICENSE for more details.
.. moduleauthor:: Kevin Glisson <kglisson@netflix.com>
"""
import os
import imp
import errno
import pkg_resources
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from logging import Formatter, StreamHandler
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from logging.handlers import RotatingFileHandler
from flask import Flask
from lemur.certificates.hooks import activate_debug_dump
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from lemur.common.health import mod as health
from lemur.extensions import db, migrate, principal, smtp_mail, metrics, sentry, cors
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DEFAULT_BLUEPRINTS = (
health,
)
API_VERSION = 1
def create_app(app_name=None, blueprints=None, config=None):
"""
Lemur application factory
:param config:
:param app_name:
:param blueprints:
:return:
"""
if not blueprints:
blueprints = DEFAULT_BLUEPRINTS
else:
blueprints = blueprints + DEFAULT_BLUEPRINTS
if not app_name:
app_name = __name__
app = Flask(app_name)
configure_app(app, config)
configure_blueprints(app, blueprints)
configure_extensions(app)
configure_logging(app)
install_plugins(app)
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@app.teardown_appcontext
def teardown(exception=None):
if db.session:
db.session.remove()
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return app
def from_file(file_path, silent=False):
"""
Updates the values in the config from a Python file. This function
behaves as if the file was imported as module with the
:param file_path:
:param silent:
"""
d = imp.new_module('config')
d.__file__ = file_path
try:
with open(file_path) as config_file:
exec(compile(config_file.read(), # nosec: config file safe
file_path, 'exec'), d.__dict__)
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except IOError as e:
if silent and e.errno in (errno.ENOENT, errno.EISDIR):
return False
e.strerror = 'Unable to load configuration file (%s)' % e.strerror
raise
return d
def configure_app(app, config=None):
"""
Different ways of configuration
:param app:
:param config:
:return:
"""
# respect the config first
if config and config != 'None':
app.config['CONFIG_PATH'] = config
app.config.from_object(from_file(config))
else:
try:
app.config.from_envvar("LEMUR_CONF")
except RuntimeError:
# look in default paths
if os.path.isfile(os.path.expanduser("~/.lemur/lemur.conf.py")):
app.config.from_object(from_file(os.path.expanduser("~/.lemur/lemur.conf.py")))
else:
app.config.from_object(from_file(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'default.conf.py')))
# we don't use this
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
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def configure_extensions(app):
"""
Attaches and configures any needed flask extensions
to our app.
:param app:
"""
db.init_app(app)
migrate.init_app(app, db)
principal.init_app(app)
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smtp_mail.init_app(app)
metrics.init_app(app)
sentry.init_app(app)
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if app.config['CORS']:
app.config['CORS_HEADERS'] = 'Content-Type'
cors.init_app(app, resources=r'/api/*', headers='Content-Type', origin='*', supports_credentials=True)
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def configure_blueprints(app, blueprints):
"""
We prefix our APIs with their given version so that we can support
multiple concurrent API versions.
:param app:
:param blueprints:
"""
for blueprint in blueprints:
app.register_blueprint(blueprint, url_prefix="/api/{0}".format(API_VERSION))
def configure_logging(app):
"""
Sets up application wide logging.
:param app:
"""
handler = RotatingFileHandler(app.config.get('LOG_FILE', 'lemur.log'), maxBytes=10000000, backupCount=100)
handler.setFormatter(Formatter(
'%(asctime)s %(levelname)s: %(message)s '
'[in %(pathname)s:%(lineno)d]'
))
handler.setLevel(app.config.get('LOG_LEVEL', 'DEBUG'))
app.logger.setLevel(app.config.get('LOG_LEVEL', 'DEBUG'))
app.logger.addHandler(handler)
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stream_handler = StreamHandler()
stream_handler.setLevel(app.config.get('LOG_LEVEL', 'DEBUG'))
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app.logger.addHandler(stream_handler)
if app.config.get('DEBUG_DUMP', False):
activate_debug_dump()
def install_plugins(app):
"""
Installs new issuers that are not currently bundled with Lemur.
:param app:
:return:
"""
from lemur.plugins import plugins
from lemur.plugins.base import register
# entry_points={
# 'lemur.plugins': [
# 'verisign = lemur_verisign.plugin:VerisignPlugin'
# ],
# },
for ep in pkg_resources.iter_entry_points('lemur.plugins'):
try:
plugin = ep.load()
except Exception:
import traceback
app.logger.error("Failed to load plugin %r:\n%s\n" % (ep.name, traceback.format_exc()))
else:
register(plugin)
# ensure that we have some way to notify
with app.app_context():
slug = app.config.get("LEMUR_DEFAULT_NOTIFICATION_PLUGIN", "email-notification")
try:
plugins.get(slug)
except KeyError:
raise Exception("Unable to location notification plugin: {slug}. Ensure that "
"LEMUR_DEFAULT_NOTIFICATION_PLUGIN is set to a valid and installed notification plugin."
.format(slug=slug))