# $Id: preforked_server.py c5bb15998025 2010-03-03 dangyogi $
# coding=utf-8
#
# Copyright 2008 Bruce Frederiksen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import sys
import os, os.path
import signal
import functools
import wsgiref.simple_server
import wsgi_app
def kill(pids, signum, frame):
sys.stderr.write("preforked_server(%d) caught SIGINT\n" % os.getpid())
sys.stderr.write("preforked_server(%d) self.pids is %s\n" %
(os.getpid(), str(pids)))
for pid in pids: os.kill(pid, signal.SIGTERM)
sys.exit(1)
class RequestHandlerNoLogging(wsgiref.simple_server.WSGIRequestHandler):
def log_request(self, code='-', size='-'): pass
class server(wsgiref.simple_server.WSGIServer):
def __init__(self, server_address, rq_handler_class, num_processes,
trace_sql, db_engine):
self.num_processes = num_processes
self.trace_sql = trace_sql
self.db_engine = db_engine
wsgiref.simple_server.WSGIServer.__init__(self, server_address,
rq_handler_class)
def init_wsgi(self):
if self.db_engine.lower() == 'sqlite3':
import sqlite3 as db
import sqlgen.load_sqlite3_schema as load_schema
db_connection = \
db.connect(os.path.join(os.path.dirname(load_schema.__file__),
'sqlite3.db'))
elif self.db_engine.lower() == 'mysql':
import MySQLdb as db
import sqlgen.load_mysql_schema as load_schema
db_connection = db.connect(user="movie_user", passwd="user_pw",
db="movie_db")
else:
raise ValueError("prefork_server.init_wsgi: "
"unrecognized db_engine: " +
self.db_engine)
load_schema.load_schema(wsgi_app.init(db_connection, self.trace_sql),
db, db_connection)
def name(self): return "prefork_server(%d)" % self.num_processes
def server_activate(self):
wsgiref.simple_server.WSGIServer.server_activate(self)
pids = []
for i in xrange(self.num_processes - 1):
pid = os.fork()
if pid == 0:
self.init_wsgi()
break
pids.append(pid)
else:
# only run by parent process
self.init_wsgi()
signal.signal(signal.SIGINT, functools.partial(kill, pids))
def run(num_processes = 2, port = 8080, logging = False, trace_sql = False,
db_engine = 'sqlite3'):
server_address = ('', port)
httpd = server(server_address,
wsgiref.simple_server.WSGIRequestHandler
if logging
else RequestHandlerNoLogging,
num_processes, trace_sql, db_engine)
httpd.set_app(wsgi_app.wsgi_app)
print "Server running..."
httpd.serve_forever()
if __name__ == "__main__":
run()
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