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##########################################################################
#
# pgAdmin 4 - PostgreSQL Tools
#
# Copyright (C) 2013 - 2024, The pgAdmin Development Team
# This software is released under the PostgreSQL Licence
#
##########################################################################
"""This is the main application entry point for pgAdmin 4. If running on
a webserver, this will provide the WSGI interface, otherwise, we're going
to start a web server."""
import sys
if sys.version_info <= (3, 9):
import select
if sys.version_info < (3, 4):
raise RuntimeError('This application must be run under Python 3.4 '
'or later.')
import builtins
import os
# We need to include the root directory in sys.path to ensure that we can
# find everything we need when running in the standalone runtime.
if sys.path[0] != os.path.dirname(os.path.realpath(__file__)):
sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)))
# Grab the SERVER_MODE if it's been set by the runtime
if 'PGADMIN_SERVER_MODE' in os.environ:
if os.environ['PGADMIN_SERVER_MODE'] == 'OFF':
builtins.SERVER_MODE = False
else:
builtins.SERVER_MODE = True
else:
builtins.SERVER_MODE = None
if (3, 10) > sys.version_info > (3, 8, 99) and os.name == 'posix':
# Fix eventlet issue with Python 3.9.
# Ref: https://github.com/eventlet/eventlet/issues/670
# This was causing issue in psycopg3
from eventlet import hubs
hubs.use_hub("poll")
import selectors
selectors.DefaultSelector = selectors.PollSelector
import config
import setup
from pgadmin import create_app, socketio
from pgadmin.utils.constants import INTERNAL
# Get the config database schema version. We store this in pgadmin.model
# as it turns out that putting it in the config files isn't a great idea
from pgadmin.model import SCHEMA_VERSION
##########################################################################
# Support reverse proxying
##########################################################################
class ReverseProxied():
def __init__(self, app):
self.app = app
# https://werkzeug.palletsprojects.com/en/0.15.x/middleware/proxy_fix
try:
from werkzeug.middleware.proxy_fix import ProxyFix
self.app = ProxyFix(app,
x_for=config.PROXY_X_FOR_COUNT,
x_proto=config.PROXY_X_PROTO_COUNT,
x_host=config.PROXY_X_HOST_COUNT,
x_port=config.PROXY_X_PORT_COUNT,
x_prefix=config.PROXY_X_PREFIX_COUNT
)
except ImportError:
pass
def __call__(self, environ, start_response):
script_name = environ.get("HTTP_X_SCRIPT_NAME", "")
if script_name:
environ["SCRIPT_NAME"] = script_name
path_info = environ["PATH_INFO"]
if path_info.startswith(script_name):
environ["PATH_INFO"] = path_info[len(script_name):]
scheme = environ.get("HTTP_X_SCHEME", "")
if scheme:
environ["wsgi.url_scheme"] = scheme
return self.app(environ, start_response)
##########################################################################
# Sanity checks
##########################################################################
config.SETTINGS_SCHEMA_VERSION = SCHEMA_VERSION
# Check if the database exists. If it does not, create it.
setup_db_required = False
if not os.path.isfile(config.SQLITE_PATH):
setup_db_required = True
##########################################################################
# Create the app and configure it. It is created outside main so that
# it can be imported
##########################################################################
app = create_app()
app.config['sessions'] = dict()
if setup_db_required:
setup.setup_db(app)
# Authentication sources
if len(config.AUTHENTICATION_SOURCES) > 0:
# Creating a temporary auth source list removing INTERNAL
# This change is done to avoid selecting INTERNAL authentication when user
# mistakenly keeps that the first option.
auth_source = [x for x in config.AUTHENTICATION_SOURCES
if x != INTERNAL]
app.PGADMIN_EXTERNAL_AUTH_SOURCE = auth_source[0] \
if len(auth_source) > 0 else INTERNAL
else:
app.PGADMIN_EXTERNAL_AUTH_SOURCE = INTERNAL
# Start the web server. The port number should have already been set by the
# runtime if we're running in desktop mode, otherwise we'll just use the
# Flask default.
app.PGADMIN_RUNTIME = False
app.logger.debug(
'Config server mode: %s', config.SERVER_MODE
)
config.EFFECTIVE_SERVER_PORT = None
if 'PGADMIN_INT_PORT' in os.environ:
port = os.environ['PGADMIN_INT_PORT']
app.logger.debug(
'Running under the desktop runtime, port: %s',
port
)
config.EFFECTIVE_SERVER_PORT = int(port)
else:
app.logger.debug(
'Not running under the desktop runtime, port: %s',
config.DEFAULT_SERVER_PORT
)
config.EFFECTIVE_SERVER_PORT = config.DEFAULT_SERVER_PORT
# Set the key if appropriate
if 'PGADMIN_INT_KEY' in os.environ:
app.PGADMIN_INT_KEY = os.environ['PGADMIN_INT_KEY']
app.logger.debug("Desktop security key: %s" % app.PGADMIN_INT_KEY)
app.PGADMIN_RUNTIME = True
else:
app.PGADMIN_INT_KEY = ''
if not app.PGADMIN_RUNTIME:
app.wsgi_app = ReverseProxied(app.wsgi_app)
app.run_before_app_start()
##########################################################################
# The entry point
##########################################################################
def main():
# Set null device file path to stdout, stdin, stderr if they are None
for _name in ('stdin', 'stdout', 'stderr'):
if getattr(sys, _name) is None:
setattr(sys, _name,
open(os.devnull, 'r' if _name == 'stdin' else 'w'))
# Output a startup message if we're not under the runtime and startup.
# If we're under WSGI, we don't need to worry about this
if not app.PGADMIN_RUNTIME:
print(
"Starting %s. Please navigate to http://%s:%d in your browser." %
(config.APP_NAME, config.DEFAULT_SERVER,
config.EFFECTIVE_SERVER_PORT)
)
sys.stdout.flush()
else:
# For unknown reason the runtime does not pass the environment
# variables (i.e. PYTHONHOME, and PYTHONPATH), to the Python
# sub-processes, leading to failures executing background processes.
#
# This has been observed only on windows. On *nix systems, it is likely
# picking the system python environment, which is good enough to run
# the process-executor.
#
# Setting PYTHONHOME launch them properly.
from pgadmin.utils import IS_WIN
if IS_WIN:
os.environ['PYTHONHOME'] = sys.prefix
# Initialize Flask service only once
# If `WERKZEUG_RUN_MAIN` is None, i.e: app is initializing for first time
# so set `use_reloader` = False, thus reload won't call.
# Reference:
# https://github.com/pallets/werkzeug/issues/220#issuecomment-11176538
try:
if config.DEBUG:
app.run(
host=config.DEFAULT_SERVER,
port=config.EFFECTIVE_SERVER_PORT,
debug=config.DEBUG,
use_reloader=(
(not app.PGADMIN_RUNTIME) and
os.environ.get("WERKZEUG_RUN_MAIN") is not None
),
threaded=config.THREADED_MODE
)
else:
try:
socketio.run(
app,
debug=config.DEBUG,
allow_unsafe_werkzeug=True,
host=config.DEFAULT_SERVER,
port=config.EFFECTIVE_SERVER_PORT,
)
except KeyboardInterrupt:
print("CLOSE SERVER")
socketio.stop()
except IOError:
app.logger.error("Error starting the app server: %s", sys.exc_info())
##########################################################################
# Server startup
##########################################################################
if __name__ == '__main__':
main()