/usr/share/pyshared/paste/script/serve.py is in python-pastescript 1.7.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
# @@: This should be moved to paste.deploy
# For discussion of daemonizing:
# http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278731
# Code taken also from QP:
# http://www.mems-exchange.org/software/qp/
# From lib/site.py
import re
import os
import errno
import sys
import time
try:
import subprocess
except ImportError:
from paste.util import subprocess24 as subprocess
from command import Command, BadCommand
from paste.deploy import loadapp, loadserver
import threading
import atexit
import logging
import ConfigParser
MAXFD = 1024
jython = sys.platform.startswith('java')
class DaemonizeException(Exception):
pass
class ServeCommand(Command):
min_args = 0
usage = 'CONFIG_FILE [start|stop|restart|status] [var=value]'
takes_config_file = 1
summary = "Serve the described application"
description = """\
This command serves a web application that uses a paste.deploy
configuration file for the server and application.
If start/stop/restart is given, then --daemon is implied, and it will
start (normal operation), stop (--stop-daemon), or do both.
You can also include variable assignments like 'http_port=8080'
and then use %(http_port)s in your config files.
"""
# used by subclasses that configure apps and servers differently
requires_config_file = True
parser = Command.standard_parser(quiet=True)
parser.add_option('-n', '--app-name',
dest='app_name',
metavar='NAME',
help="Load the named application (default main)")
parser.add_option('-s', '--server',
dest='server',
metavar='SERVER_TYPE',
help="Use the named server.")
parser.add_option('--server-name',
dest='server_name',
metavar='SECTION_NAME',
help="Use the named server as defined in the configuration file (default: main)")
if hasattr(os, 'fork'):
parser.add_option('--daemon',
dest="daemon",
action="store_true",
help="Run in daemon (background) mode")
parser.add_option('--pid-file',
dest='pid_file',
metavar='FILENAME',
help="Save PID to file (default to paster.pid if running in daemon mode)")
parser.add_option('--log-file',
dest='log_file',
metavar='LOG_FILE',
help="Save output to the given log file (redirects stdout)")
parser.add_option('--reload',
dest='reload',
action='store_true',
help="Use auto-restart file monitor")
parser.add_option('--reload-interval',
dest='reload_interval',
default=1,
help="Seconds between checking files (low number can cause significant CPU usage)")
parser.add_option('--monitor-restart',
dest='monitor_restart',
action='store_true',
help="Auto-restart server if it dies")
parser.add_option('--status',
action='store_true',
dest='show_status',
help="Show the status of the (presumably daemonized) server")
if hasattr(os, 'setuid'):
# I don't think these are available on Windows
parser.add_option('--user',
dest='set_user',
metavar="USERNAME",
help="Set the user (usually only possible when run as root)")
parser.add_option('--group',
dest='set_group',
metavar="GROUP",
help="Set the group (usually only possible when run as root)")
parser.add_option('--stop-daemon',
dest='stop_daemon',
action='store_true',
help='Stop a daemonized server (given a PID file, or default paster.pid file)')
if jython:
parser.add_option('--disable-jython-reloader',
action='store_true',
dest='disable_jython_reloader',
help="Disable the Jython reloader")
_scheme_re = re.compile(r'^[a-z][a-z]+:', re.I)
default_verbosity = 1
_reloader_environ_key = 'PYTHON_RELOADER_SHOULD_RUN'
_monitor_environ_key = 'PASTE_MONITOR_SHOULD_RUN'
possible_subcommands = ('start', 'stop', 'restart', 'status')
def command(self):
if self.options.stop_daemon:
return self.stop_daemon()
if not hasattr(self.options, 'set_user'):
# Windows case:
self.options.set_user = self.options.set_group = None
# @@: Is this the right stage to set the user at?
self.change_user_group(
self.options.set_user, self.options.set_group)
if self.requires_config_file:
if not self.args:
raise BadCommand('You must give a config file')
app_spec = self.args[0]
if (len(self.args) > 1
and self.args[1] in self.possible_subcommands):
cmd = self.args[1]
restvars = self.args[2:]
else:
cmd = None
restvars = self.args[1:]
else:
app_spec = ""
if (self.args
and self.args[0] in self.possible_subcommands):
cmd = self.args[0]
restvars = self.args[1:]
else:
cmd = None
restvars = self.args[:]
if (getattr(self.options, 'daemon', False)
and getattr(self.options, 'reload', False)):
raise BadCommand('The --daemon and --reload options may not be used together')
jython_monitor = False
if self.options.reload:
if jython and not self.options.disable_jython_reloader:
# JythonMonitor raises the special SystemRestart
# exception that'll cause the Jython interpreter to
# reload in the existing Java process (avoiding
# subprocess startup time)
try:
from paste.reloader import JythonMonitor
except ImportError:
pass
else:
jython_monitor = JythonMonitor(poll_interval=int(
self.options.reload_interval))
if self.requires_config_file:
jython_monitor.watch_file(self.args[0])
if not jython_monitor:
if os.environ.get(self._reloader_environ_key):
from paste import reloader
if self.verbose > 1:
print 'Running reloading file monitor'
reloader.install(int(self.options.reload_interval))
if self.requires_config_file:
reloader.watch_file(self.args[0])
else:
return self.restart_with_reloader()
if cmd not in (None, 'start', 'stop', 'restart', 'status'):
raise BadCommand(
'Error: must give start|stop|restart (not %s)' % cmd)
if cmd == 'status' or self.options.show_status:
return self.show_status()
if cmd == 'restart' or cmd == 'stop':
result = self.stop_daemon()
if result:
if cmd == 'restart':
print "Could not stop daemon; aborting"
else:
print "Could not stop daemon"
return result
if cmd == 'stop':
return result
self.options.daemon = True
if cmd == 'start':
self.options.daemon = True
app_name = self.options.app_name
vars = self.parse_vars(restvars)
if not self._scheme_re.search(app_spec):
app_spec = 'config:' + app_spec
server_name = self.options.server_name
if self.options.server:
server_spec = 'egg:PasteScript'
assert server_name is None
server_name = self.options.server
else:
server_spec = app_spec
base = os.getcwd()
if getattr(self.options, 'daemon', False):
if not self.options.pid_file:
self.options.pid_file = 'paster.pid'
if not self.options.log_file:
self.options.log_file = 'paster.log'
# Ensure the log file is writeable
if self.options.log_file:
try:
writeable_log_file = open(self.options.log_file, 'a')
except IOError, ioe:
msg = 'Error: Unable to write to log file: %s' % ioe
raise BadCommand(msg)
writeable_log_file.close()
# Ensure the pid file is writeable
if self.options.pid_file:
try:
writeable_pid_file = open(self.options.pid_file, 'a')
except IOError, ioe:
msg = 'Error: Unable to write to pid file: %s' % ioe
raise BadCommand(msg)
writeable_pid_file.close()
if getattr(self.options, 'daemon', False):
try:
self.daemonize()
except DaemonizeException, ex:
if self.verbose > 0:
print str(ex)
return
if (self.options.monitor_restart
and not os.environ.get(self._monitor_environ_key)):
return self.restart_with_monitor()
if self.options.pid_file:
self.record_pid(self.options.pid_file)
if self.options.log_file:
stdout_log = LazyWriter(self.options.log_file, 'a')
sys.stdout = stdout_log
sys.stderr = stdout_log
logging.basicConfig(stream=stdout_log)
log_fn = app_spec
if log_fn.startswith('config:'):
log_fn = app_spec[len('config:'):]
elif log_fn.startswith('egg:'):
log_fn = None
if log_fn:
log_fn = os.path.join(base, log_fn)
self.logging_file_config(log_fn)
server = self.loadserver(server_spec, name=server_name,
relative_to=base, global_conf=vars)
app = self.loadapp(app_spec, name=app_name,
relative_to=base, global_conf=vars)
if self.verbose > 0:
if hasattr(os, 'getpid'):
msg = 'Starting server in PID %i.' % os.getpid()
else:
msg = 'Starting server.'
print msg
def serve():
try:
server(app)
except (SystemExit, KeyboardInterrupt), e:
if self.verbose > 1:
raise
if str(e):
msg = ' '+str(e)
else:
msg = ''
print 'Exiting%s (-v to see traceback)' % msg
if jython_monitor:
# JythonMonitor has to be ran from the main thread
threading.Thread(target=serve).start()
print 'Starting Jython file monitor'
jython_monitor.periodic_reload()
else:
serve()
def loadserver(self, server_spec, name, relative_to, **kw):
return loadserver(
server_spec, name=name,
relative_to=relative_to, **kw)
def loadapp(self, app_spec, name, relative_to, **kw):
return loadapp(
app_spec, name=name, relative_to=relative_to,
**kw)
def daemonize(self):
pid = live_pidfile(self.options.pid_file)
if pid:
raise DaemonizeException(
"Daemon is already running (PID: %s from PID file %s)"
% (pid, self.options.pid_file))
if self.verbose > 0:
print 'Entering daemon mode'
pid = os.fork()
if pid:
# The forked process also has a handle on resources, so we
# *don't* want proper termination of the process, we just
# want to exit quick (which os._exit() does)
os._exit(0)
# Make this the session leader
os.setsid()
# Fork again for good measure!
pid = os.fork()
if pid:
os._exit(0)
# @@: Should we set the umask and cwd now?
import resource # Resource usage information.
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if (maxfd == resource.RLIM_INFINITY):
maxfd = MAXFD
# Iterate through and close all file descriptors.
for fd in range(0, maxfd):
try:
os.close(fd)
except OSError: # ERROR, fd wasn't open to begin with (ignored)
pass
if (hasattr(os, "devnull")):
REDIRECT_TO = os.devnull
else:
REDIRECT_TO = "/dev/null"
os.open(REDIRECT_TO, os.O_RDWR) # standard input (0)
# Duplicate standard input to standard output and standard error.
os.dup2(0, 1) # standard output (1)
os.dup2(0, 2) # standard error (2)
def record_pid(self, pid_file):
pid = os.getpid()
if self.verbose > 1:
print 'Writing PID %s to %s' % (pid, pid_file)
f = open(pid_file, 'w')
f.write(str(pid))
f.close()
atexit.register(_remove_pid_file, pid, pid_file, self.verbose)
def stop_daemon(self):
pid_file = self.options.pid_file or 'paster.pid'
if not os.path.exists(pid_file):
print 'No PID file exists in %s' % pid_file
return 1
pid = read_pidfile(pid_file)
if not pid:
print "Not a valid PID file in %s" % pid_file
return 1
pid = live_pidfile(pid_file)
if not pid:
print "PID in %s is not valid (deleting)" % pid_file
try:
os.unlink(pid_file)
except (OSError, IOError), e:
print "Could not delete: %s" % e
return 2
return 1
for j in range(10):
if not live_pidfile(pid_file):
break
import signal
os.kill(pid, signal.SIGTERM)
time.sleep(1)
else:
print "failed to kill web process %s" % pid
return 3
if os.path.exists(pid_file):
os.unlink(pid_file)
return 0
def show_status(self):
pid_file = self.options.pid_file or 'paster.pid'
if not os.path.exists(pid_file):
print 'No PID file %s' % pid_file
return 1
pid = read_pidfile(pid_file)
if not pid:
print 'No PID in file %s' % pid_file
return 1
pid = live_pidfile(pid_file)
if not pid:
print 'PID %s in %s is not running' % (pid, pid_file)
return 1
print 'Server running in PID %s' % pid
return 0
def restart_with_reloader(self):
self.restart_with_monitor(reloader=True)
def restart_with_monitor(self, reloader=False):
if self.verbose > 0:
if reloader:
print 'Starting subprocess with file monitor'
else:
print 'Starting subprocess with monitor parent'
while 1:
args = [self.quote_first_command_arg(sys.executable)] + sys.argv
new_environ = os.environ.copy()
if reloader:
new_environ[self._reloader_environ_key] = 'true'
else:
new_environ[self._monitor_environ_key] = 'true'
proc = None
try:
try:
_turn_sigterm_into_systemexit()
proc = subprocess.Popen(args, env=new_environ)
exit_code = proc.wait()
proc = None
except KeyboardInterrupt:
print '^C caught in monitor process'
if self.verbose > 1:
raise
return 1
finally:
if (proc is not None
and hasattr(os, 'kill')):
import signal
try:
os.kill(proc.pid, signal.SIGTERM)
except (OSError, IOError):
pass
if reloader:
# Reloader always exits with code 3; but if we are
# a monitor, any exit code will restart
if exit_code != 3:
return exit_code
if self.verbose > 0:
print '-'*20, 'Restarting', '-'*20
def change_user_group(self, user, group):
if not user and not group:
return
import pwd, grp
uid = gid = None
if group:
try:
gid = int(group)
group = grp.getgrgid(gid).gr_name
except ValueError:
import grp
try:
entry = grp.getgrnam(group)
except KeyError:
raise BadCommand(
"Bad group: %r; no such group exists" % group)
gid = entry.gr_gid
try:
uid = int(user)
user = pwd.getpwuid(uid).pw_name
except ValueError:
try:
entry = pwd.getpwnam(user)
except KeyError:
raise BadCommand(
"Bad username: %r; no such user exists" % user)
if not gid:
gid = entry.pw_gid
uid = entry.pw_uid
if self.verbose > 0:
print 'Changing user to %s:%s (%s:%s)' % (
user, group or '(unknown)', uid, gid)
if gid:
os.setgid(gid)
if uid:
os.setuid(uid)
class LazyWriter(object):
"""
File-like object that opens a file lazily when it is first written
to.
"""
def __init__(self, filename, mode='w'):
self.filename = filename
self.fileobj = None
self.lock = threading.Lock()
self.mode = mode
def open(self):
if self.fileobj is None:
self.lock.acquire()
try:
if self.fileobj is None:
self.fileobj = open(self.filename, self.mode)
finally:
self.lock.release()
return self.fileobj
def write(self, text):
fileobj = self.open()
fileobj.write(text)
fileobj.flush()
def writelines(self, text):
fileobj = self.open()
fileobj.writelines(text)
fileobj.flush()
def flush(self):
self.open().flush()
def live_pidfile(pidfile):
"""(pidfile:str) -> int | None
Returns an int found in the named file, if there is one,
and if there is a running process with that process id.
Return None if no such process exists.
"""
pid = read_pidfile(pidfile)
if pid:
try:
os.kill(int(pid), 0)
return pid
except OSError, e:
if e.errno == errno.EPERM:
return pid
return None
def read_pidfile(filename):
if os.path.exists(filename):
try:
f = open(filename)
content = f.read()
f.close()
return int(content.strip())
except (ValueError, IOError):
return None
else:
return None
def _remove_pid_file(written_pid, filename, verbosity):
current_pid = os.getpid()
if written_pid != current_pid:
# A forked process must be exiting, not the process that
# wrote the PID file
return
if not os.path.exists(filename):
return
f = open(filename)
content = f.read().strip()
f.close()
try:
pid_in_file = int(content)
except ValueError:
pass
else:
if pid_in_file != current_pid:
print "PID file %s contains %s, not expected PID %s" % (
filename, pid_in_file, current_pid)
return
if verbosity > 0:
print "Removing PID file %s" % filename
try:
os.unlink(filename)
return
except OSError, e:
# Record, but don't give traceback
print "Cannot remove PID file: %s" % e
# well, at least lets not leave the invalid PID around...
try:
f = open(filename, 'w')
f.write('')
f.close()
except OSError, e:
print 'Stale PID left in file: %s (%e)' % (filename, e)
else:
print 'Stale PID removed'
def ensure_port_cleanup(bound_addresses, maxtries=30, sleeptime=2):
"""
This makes sure any open ports are closed.
Does this by connecting to them until they give connection
refused. Servers should call like::
import paste.script
ensure_port_cleanup([80, 443])
"""
atexit.register(_cleanup_ports, bound_addresses, maxtries=maxtries,
sleeptime=sleeptime)
def _cleanup_ports(bound_addresses, maxtries=30, sleeptime=2):
# Wait for the server to bind to the port.
import socket
import errno
for bound_address in bound_addresses:
for attempt in range(maxtries):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect(bound_address)
except socket.error, e:
if e.args[0] != errno.ECONNREFUSED:
raise
break
else:
time.sleep(sleeptime)
else:
raise SystemExit('Timeout waiting for port.')
sock.close()
def _turn_sigterm_into_systemexit():
"""
Attempts to turn a SIGTERM exception into a SystemExit exception.
"""
try:
import signal
except ImportError:
return
def handle_term(signo, frame):
raise SystemExit
signal.signal(signal.SIGTERM, handle_term)
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