Mini Shell
# -*- coding: utf-8 -
#
# This file is part of gunicorn released under the MIT license.
# See the NOTICE for more information.
import ast
import ctypes.util
import email.utils
import errno
import fcntl
import html
import importlib
import inspect
import io
import logging
import os
import pwd
import random
import re
import socket
import sys
import textwrap
import time
import traceback
import warnings
import pkg_resources
from gunicorn.errors import AppImportError
from gunicorn.workers import SUPPORTED_WORKERS
import urllib.parse
REDIRECT_TO = getattr(os, 'devnull', '/dev/null')
# Server and Date aren't technically hop-by-hop
# headers, but they are in the purview of the
# origin server which the WSGI spec says we should
# act like. So we drop them and add our own.
#
# In the future, concatenation server header values
# might be better, but nothing else does it and
# dropping them is easier.
hop_headers = set("""
connection keep-alive proxy-authenticate proxy-authorization
te trailers transfer-encoding upgrade
server date
""".split())
try:
from setproctitle import setproctitle
def _setproctitle(title):
setproctitle("gunicorn: %s" % title)
except ImportError:
def _setproctitle(title):
pass
def load_class(uri, default="gunicorn.workers.sync.SyncWorker",
section="gunicorn.workers"):
if inspect.isclass(uri):
return uri
if uri.startswith("egg:"):
# uses entry points
entry_str = uri.split("egg:")[1]
try:
dist, name = entry_str.rsplit("#", 1)
except ValueError:
dist = entry_str
name = default
try:
return pkg_resources.load_entry_point(dist, section, name)
except:
exc = traceback.format_exc()
msg = "class uri %r invalid or not found: \n\n[%s]"
raise RuntimeError(msg % (uri, exc))
else:
components = uri.split('.')
if len(components) == 1:
while True:
if uri.startswith("#"):
uri = uri[1:]
if uri in SUPPORTED_WORKERS:
components = SUPPORTED_WORKERS[uri].split(".")
break
try:
return pkg_resources.load_entry_point("gunicorn",
section, uri)
except:
exc = traceback.format_exc()
msg = "class uri %r invalid or not found: \n\n[%s]"
raise RuntimeError(msg % (uri, exc))
klass = components.pop(-1)
try:
mod = importlib.import_module('.'.join(components))
except:
exc = traceback.format_exc()
msg = "class uri %r invalid or not found: \n\n[%s]"
raise RuntimeError(msg % (uri, exc))
return getattr(mod, klass)
positionals = (
inspect.Parameter.POSITIONAL_ONLY,
inspect.Parameter.POSITIONAL_OR_KEYWORD,
)
def get_arity(f):
sig = inspect.signature(f)
arity = 0
for param in sig.parameters.values():
if param.kind in positionals:
arity += 1
return arity
def get_username(uid):
""" get the username for a user id"""
return pwd.getpwuid(uid).pw_name
def set_owner_process(uid, gid, initgroups=False):
""" set user and group of workers processes """
if gid:
if uid:
try:
username = get_username(uid)
except KeyError:
initgroups = False
# versions of python < 2.6.2 don't manage unsigned int for
# groups like on osx or fedora
gid = abs(gid) & 0x7FFFFFFF
if initgroups:
os.initgroups(username, gid)
elif gid != os.getgid():
os.setgid(gid)
if uid:
os.setuid(uid)
def chown(path, uid, gid):
os.chown(path, uid, gid)
if sys.platform.startswith("win"):
def _waitfor(func, pathname, waitall=False):
# Perform the operation
func(pathname)
# Now setup the wait loop
if waitall:
dirname = pathname
else:
dirname, name = os.path.split(pathname)
dirname = dirname or '.'
# Check for `pathname` to be removed from the filesystem.
# The exponential backoff of the timeout amounts to a total
# of ~1 second after which the deletion is probably an error
# anyway.
# Testing on a i7@4.3GHz shows that usually only 1 iteration is
# required when contention occurs.
timeout = 0.001
while timeout < 1.0:
# Note we are only testing for the existence of the file(s) in
# the contents of the directory regardless of any security or
# access rights. If we have made it this far, we have sufficient
# permissions to do that much using Python's equivalent of the
# Windows API FindFirstFile.
# Other Windows APIs can fail or give incorrect results when
# dealing with files that are pending deletion.
L = os.listdir(dirname)
if not L if waitall else name in L:
return
# Increase the timeout and try again
time.sleep(timeout)
timeout *= 2
warnings.warn('tests may fail, delete still pending for ' + pathname,
RuntimeWarning, stacklevel=4)
def _unlink(filename):
_waitfor(os.unlink, filename)
else:
_unlink = os.unlink
def unlink(filename):
try:
_unlink(filename)
except OSError as error:
# The filename need not exist.
if error.errno not in (errno.ENOENT, errno.ENOTDIR):
raise
def is_ipv6(addr):
try:
socket.inet_pton(socket.AF_INET6, addr)
except socket.error: # not a valid address
return False
except ValueError: # ipv6 not supported on this platform
return False
return True
def parse_address(netloc, default_port='8000'):
if re.match(r'unix:(//)?', netloc):
return re.split(r'unix:(//)?', netloc)[-1]
if netloc.startswith("fd://"):
fd = netloc[5:]
try:
return int(fd)
except ValueError:
raise RuntimeError("%r is not a valid file descriptor." % fd) from None
if netloc.startswith("tcp://"):
netloc = netloc.split("tcp://")[1]
host, port = netloc, default_port
if '[' in netloc and ']' in netloc:
host = netloc.split(']')[0][1:]
port = (netloc.split(']:') + [default_port])[1]
elif ':' in netloc:
host, port = (netloc.split(':') + [default_port])[:2]
elif netloc == "":
host, port = "0.0.0.0", default_port
try:
port = int(port)
except ValueError:
raise RuntimeError("%r is not a valid port number." % port)
return host.lower(), port
def close_on_exec(fd):
flags = fcntl.fcntl(fd, fcntl.F_GETFD)
flags |= fcntl.FD_CLOEXEC
fcntl.fcntl(fd, fcntl.F_SETFD, flags)
def set_non_blocking(fd):
flags = fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK
fcntl.fcntl(fd, fcntl.F_SETFL, flags)
def close(sock):
try:
sock.close()
except socket.error:
pass
try:
from os import closerange
except ImportError:
def closerange(fd_low, fd_high):
# Iterate through and close all file descriptors.
for fd in range(fd_low, fd_high):
try:
os.close(fd)
except OSError: # ERROR, fd wasn't open to begin with (ignored)
pass
def write_chunk(sock, data):
if isinstance(data, str):
data = data.encode('utf-8')
chunk_size = "%X\r\n" % len(data)
chunk = b"".join([chunk_size.encode('utf-8'), data, b"\r\n"])
sock.sendall(chunk)
def write(sock, data, chunked=False):
if chunked:
return write_chunk(sock, data)
sock.sendall(data)
def write_nonblock(sock, data, chunked=False):
timeout = sock.gettimeout()
if timeout != 0.0:
try:
sock.setblocking(0)
return write(sock, data, chunked)
finally:
sock.setblocking(1)
else:
return write(sock, data, chunked)
def write_error(sock, status_int, reason, mesg):
html_error = textwrap.dedent("""\
<html>
<head>
<title>%(reason)s</title>
</head>
<body>
<h1><p>%(reason)s</p></h1>
%(mesg)s
</body>
</html>
""") % {"reason": reason, "mesg": html.escape(mesg)}
http = textwrap.dedent("""\
HTTP/1.1 %s %s\r
Connection: close\r
Content-Type: text/html\r
Content-Length: %d\r
\r
%s""") % (str(status_int), reason, len(html_error), html_error)
write_nonblock(sock, http.encode('latin1'))
def _called_with_wrong_args(f):
"""Check whether calling a function raised a ``TypeError`` because
the call failed or because something in the function raised the
error.
:param f: The function that was called.
:return: ``True`` if the call failed.
"""
tb = sys.exc_info()[2]
try:
while tb is not None:
if tb.tb_frame.f_code is f.__code__:
# In the function, it was called successfully.
return False
tb = tb.tb_next
# Didn't reach the function.
return True
finally:
# Delete tb to break a circular reference in Python 2.
# https://docs.python.org/2/library/sys.html#sys.exc_info
del tb
def import_app(module):
parts = module.split(":", 1)
if len(parts) == 1:
obj = "application"
else:
module, obj = parts[0], parts[1]
try:
mod = importlib.import_module(module)
except ImportError:
if module.endswith(".py") and os.path.exists(module):
msg = "Failed to find application, did you mean '%s:%s'?"
raise ImportError(msg % (module.rsplit(".", 1)[0], obj))
raise
# Parse obj as a single expression to determine if it's a valid
# attribute name or function call.
try:
expression = ast.parse(obj, mode="eval").body
except SyntaxError:
raise AppImportError(
"Failed to parse %r as an attribute name or function call." % obj
)
if isinstance(expression, ast.Name):
name = expression.id
args = kwargs = None
elif isinstance(expression, ast.Call):
# Ensure the function name is an attribute name only.
if not isinstance(expression.func, ast.Name):
raise AppImportError("Function reference must be a simple name: %r" % obj)
name = expression.func.id
# Parse the positional and keyword arguments as literals.
try:
args = [ast.literal_eval(arg) for arg in expression.args]
kwargs = {kw.arg: ast.literal_eval(kw.value) for kw in expression.keywords}
except ValueError:
# literal_eval gives cryptic error messages, show a generic
# message with the full expression instead.
raise AppImportError(
"Failed to parse arguments as literal values: %r" % obj
)
else:
raise AppImportError(
"Failed to parse %r as an attribute name or function call." % obj
)
is_debug = logging.root.level == logging.DEBUG
try:
app = getattr(mod, name)
except AttributeError:
if is_debug:
traceback.print_exception(*sys.exc_info())
raise AppImportError("Failed to find attribute %r in %r." % (name, module))
# If the expression was a function call, call the retrieved object
# to get the real application.
if args is not None:
try:
app = app(*args, **kwargs)
except TypeError as e:
# If the TypeError was due to bad arguments to the factory
# function, show Python's nice error message without a
# traceback.
if _called_with_wrong_args(app):
raise AppImportError(
"".join(traceback.format_exception_only(TypeError, e)).strip()
)
# Otherwise it was raised from within the function, show the
# full traceback.
raise
if app is None:
raise AppImportError("Failed to find application object: %r" % obj)
if not callable(app):
raise AppImportError("Application object must be callable.")
return app
def getcwd():
# get current path, try to use PWD env first
try:
a = os.stat(os.environ['PWD'])
b = os.stat(os.getcwd())
if a.st_ino == b.st_ino and a.st_dev == b.st_dev:
cwd = os.environ['PWD']
else:
cwd = os.getcwd()
except:
cwd = os.getcwd()
return cwd
def http_date(timestamp=None):
"""Return the current date and time formatted for a message header."""
if timestamp is None:
timestamp = time.time()
s = email.utils.formatdate(timestamp, localtime=False, usegmt=True)
return s
def is_hoppish(header):
return header.lower().strip() in hop_headers
def daemonize(enable_stdio_inheritance=False):
"""\
Standard daemonization of a process.
http://www.svbug.com/documentation/comp.unix.programmer-FAQ/faq_2.html#SEC16
"""
if 'GUNICORN_FD' not in os.environ:
if os.fork():
os._exit(0)
os.setsid()
if os.fork():
os._exit(0)
os.umask(0o22)
# In both the following any file descriptors above stdin
# stdout and stderr are left untouched. The inheritance
# option simply allows one to have output go to a file
# specified by way of shell redirection when not wanting
# to use --error-log option.
if not enable_stdio_inheritance:
# Remap all of stdin, stdout and stderr on to
# /dev/null. The expectation is that users have
# specified the --error-log option.
closerange(0, 3)
fd_null = os.open(REDIRECT_TO, os.O_RDWR)
if fd_null != 0:
os.dup2(fd_null, 0)
os.dup2(fd_null, 1)
os.dup2(fd_null, 2)
else:
fd_null = os.open(REDIRECT_TO, os.O_RDWR)
# Always redirect stdin to /dev/null as we would
# never expect to need to read interactive input.
if fd_null != 0:
os.close(0)
os.dup2(fd_null, 0)
# If stdout and stderr are still connected to
# their original file descriptors we check to see
# if they are associated with terminal devices.
# When they are we map them to /dev/null so that
# are still detached from any controlling terminal
# properly. If not we preserve them as they are.
#
# If stdin and stdout were not hooked up to the
# original file descriptors, then all bets are
# off and all we can really do is leave them as
# they were.
#
# This will allow 'gunicorn ... > output.log 2>&1'
# to work with stdout/stderr going to the file
# as expected.
#
# Note that if using --error-log option, the log
# file specified through shell redirection will
# only be used up until the log file specified
# by the option takes over. As it replaces stdout
# and stderr at the file descriptor level, then
# anything using stdout or stderr, including having
# cached a reference to them, will still work.
def redirect(stream, fd_expect):
try:
fd = stream.fileno()
if fd == fd_expect and stream.isatty():
os.close(fd)
os.dup2(fd_null, fd)
except AttributeError:
pass
redirect(sys.stdout, 1)
redirect(sys.stderr, 2)
def seed():
try:
random.seed(os.urandom(64))
except NotImplementedError:
random.seed('%s.%s' % (time.time(), os.getpid()))
def check_is_writeable(path):
try:
f = open(path, 'a')
except IOError as e:
raise RuntimeError("Error: '%s' isn't writable [%r]" % (path, e))
f.close()
def to_bytestring(value, encoding="utf8"):
"""Converts a string argument to a byte string"""
if isinstance(value, bytes):
return value
if not isinstance(value, str):
raise TypeError('%r is not a string' % value)
return value.encode(encoding)
def has_fileno(obj):
if not hasattr(obj, "fileno"):
return False
# check BytesIO case and maybe others
try:
obj.fileno()
except (AttributeError, IOError, io.UnsupportedOperation):
return False
return True
def warn(msg):
print("!!!", file=sys.stderr)
lines = msg.splitlines()
for i, line in enumerate(lines):
if i == 0:
line = "WARNING: %s" % line
print("!!! %s" % line, file=sys.stderr)
print("!!!\n", file=sys.stderr)
sys.stderr.flush()
def make_fail_app(msg):
msg = to_bytestring(msg)
def app(environ, start_response):
start_response("500 Internal Server Error", [
("Content-Type", "text/plain"),
("Content-Length", str(len(msg)))
])
return [msg]
return app
def split_request_uri(uri):
if uri.startswith("//"):
# When the path starts with //, urlsplit considers it as a
# relative uri while the RFC says we should consider it as abs_path
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
# We use temporary dot prefix to workaround this behaviour
parts = urllib.parse.urlsplit("." + uri)
return parts._replace(path=parts.path[1:])
return urllib.parse.urlsplit(uri)
# From six.reraise
def reraise(tp, value, tb=None):
try:
if value is None:
value = tp()
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
finally:
value = None
tb = None
def bytes_to_str(b):
if isinstance(b, str):
return b
return str(b, 'latin1')
def unquote_to_wsgi_str(string):
return urllib.parse.unquote_to_bytes(string).decode('latin-1')
def _findWalk_ldpath(name):
def _is_elf(filepath):
try:
with open(filepath, 'rb') as fh:
return fh.read(4) == b'\x7fELF'
except:
return False
from glob import glob
if os.path.isabs(name):
return name
# search LD_LIBRARY_PATH list
paths = ['/lib', '/usr/local/lib', '/usr/lib']
if 'LD_LIBRARY_PATH' in os.environ:
paths = os.environ['LD_LIBRARY_PATH'].split(':') + paths
for d in paths:
f = os.path.join(d, name)
if _is_elf(f):
return os.path.basename(f)
prefix = os.path.join(d, 'lib'+name)
for suffix in ['so', 'so.*', '*.so.*', 'a']:
for f in glob('{0}.{1}'.format(prefix, suffix)):
if _is_elf(f) or suffix == 'a':
return os.path.basename(f)
def find_library(name):
return ctypes.util.find_library(name) or _findWalk_ldpath(name)
Zerion Mini Shell 1.0