# Copyright 2011-present MongoDB, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); you # may not use this file except in compliance with the License. You # may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or # implied. See the License for the specific language governing # permissions and limitations under the License. import contextlib import copy import os import platform import socket import sys import threading import collections from pymongo.ssl_support import ( SSLError as _SSLError, HAS_SNI as _HAVE_SNI, IPADDR_SAFE as _IPADDR_SAFE) from bson import DEFAULT_CODEC_OPTIONS from bson.py3compat import imap, itervalues, _unicode from bson.son import SON from pymongo import auth, helpers, thread_util, __version__ from pymongo.client_session import _validate_session_write_concern from pymongo.common import (MAX_BSON_SIZE, MAX_IDLE_TIME_SEC, MAX_MESSAGE_SIZE, MAX_POOL_SIZE, MAX_WIRE_VERSION, MAX_WRITE_BATCH_SIZE, MIN_POOL_SIZE, ORDERED_TYPES, WAIT_QUEUE_TIMEOUT) from pymongo.errors import (AutoReconnect, CertificateError, ConnectionFailure, ConfigurationError, InvalidOperation, DocumentTooLarge, NetworkTimeout, NotMasterError, OperationFailure, PyMongoError) from pymongo.ismaster import IsMaster from pymongo.monotonic import time as _time from pymongo.monitoring import (ConnectionCheckOutFailedReason, ConnectionClosedReason) from pymongo.network import (command, receive_message) from pymongo.read_preferences import ReadPreference from pymongo.server_type import SERVER_TYPE from pymongo.socket_checker import SocketChecker # Always use our backport so we always have support for IP address matching from pymongo.ssl_match_hostname import match_hostname # For SNI support. According to RFC6066, section 3, IPv4 and IPv6 literals are # not permitted for SNI hostname. try: from ipaddress import ip_address def is_ip_address(address): try: ip_address(_unicode(address)) return True except (ValueError, UnicodeError): return False except ImportError: if hasattr(socket, 'inet_pton') and socket.has_ipv6: # Most *nix, recent Windows def is_ip_address(address): try: # inet_pton rejects IPv4 literals with leading zeros # (e.g. 192.168.0.01), inet_aton does not, and we # can connect to them without issue. Use inet_aton. socket.inet_aton(address) return True except socket.error: try: socket.inet_pton(socket.AF_INET6, address) return True except socket.error: return False else: # No inet_pton def is_ip_address(address): try: socket.inet_aton(address) return True except socket.error: if ':' in address: # ':' is not a valid character for a hostname. If we get # here a few things have to be true: # - We're on a recent version of python 2.7 (2.7.9+). # Older 2.7 versions don't support SNI. # - We're on Windows XP or some unusual Unix that doesn't # have inet_pton. # - The application is using IPv6 literals with TLS, which # is pretty unusual. return True return False try: from fcntl import fcntl, F_GETFD, F_SETFD, FD_CLOEXEC def _set_non_inheritable_non_atomic(fd): """Set the close-on-exec flag on the given file descriptor.""" flags = fcntl(fd, F_GETFD) fcntl(fd, F_SETFD, flags | FD_CLOEXEC) except ImportError: # Windows, various platforms we don't claim to support # (Jython, IronPython, ...), systems that don't provide # everything we need from fcntl, etc. def _set_non_inheritable_non_atomic(dummy): """Dummy function for platforms that don't provide fcntl.""" pass _MAX_TCP_KEEPIDLE = 120 _MAX_TCP_KEEPINTVL = 10 _MAX_TCP_KEEPCNT = 9 if sys.platform == 'win32': try: import _winreg as winreg except ImportError: import winreg def _query(key, name, default): try: value, _ = winreg.QueryValueEx(key, name) # Ensure the value is a number or raise ValueError. return int(value) except (OSError, ValueError): # QueryValueEx raises OSError when the key does not exist (i.e. # the system is using the Windows default value). return default try: with winreg.OpenKey( winreg.HKEY_LOCAL_MACHINE, r"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters") as key: _WINDOWS_TCP_IDLE_MS = _query(key, "KeepAliveTime", 7200000) _WINDOWS_TCP_INTERVAL_MS = _query(key, "KeepAliveInterval", 1000) except OSError: # We could not check the default values because winreg.OpenKey failed. # Assume the system is using the default values. _WINDOWS_TCP_IDLE_MS = 7200000 _WINDOWS_TCP_INTERVAL_MS = 1000 def _set_keepalive_times(sock): idle_ms = min(_WINDOWS_TCP_IDLE_MS, _MAX_TCP_KEEPIDLE * 1000) interval_ms = min(_WINDOWS_TCP_INTERVAL_MS, _MAX_TCP_KEEPINTVL * 1000) if (idle_ms < _WINDOWS_TCP_IDLE_MS or interval_ms < _WINDOWS_TCP_INTERVAL_MS): sock.ioctl(socket.SIO_KEEPALIVE_VALS, (1, idle_ms, interval_ms)) else: def _set_tcp_option(sock, tcp_option, max_value): if hasattr(socket, tcp_option): sockopt = getattr(socket, tcp_option) try: # PYTHON-1350 - NetBSD doesn't implement getsockopt for # TCP_KEEPIDLE and friends. Don't attempt to set the # values there. default = sock.getsockopt(socket.IPPROTO_TCP, sockopt) if default > max_value: sock.setsockopt(socket.IPPROTO_TCP, sockopt, max_value) except socket.error: pass def _set_keepalive_times(sock): _set_tcp_option(sock, 'TCP_KEEPIDLE', _MAX_TCP_KEEPIDLE) _set_tcp_option(sock, 'TCP_KEEPINTVL', _MAX_TCP_KEEPINTVL) _set_tcp_option(sock, 'TCP_KEEPCNT', _MAX_TCP_KEEPCNT) _METADATA = SON([ ('driver', SON([('name', 'PyMongo'), ('version', __version__)])), ]) if sys.platform.startswith('linux'): # platform.linux_distribution was deprecated in Python 3.5. if sys.version_info[:2] < (3, 5): # Distro name and version (e.g. Ubuntu 16.04 xenial) _name = ' '.join([part for part in platform.linux_distribution() if part]) else: _name = platform.system() _METADATA['os'] = SON([ ('type', platform.system()), ('name', _name), ('architecture', platform.machine()), # Kernel version (e.g. 4.4.0-17-generic). ('version', platform.release()) ]) elif sys.platform == 'darwin': _METADATA['os'] = SON([ ('type', platform.system()), ('name', platform.system()), ('architecture', platform.machine()), # (mac|i|tv)OS(X) version (e.g. 10.11.6) instead of darwin # kernel version. ('version', platform.mac_ver()[0]) ]) elif sys.platform == 'win32': _METADATA['os'] = SON([ ('type', platform.system()), # "Windows XP", "Windows 7", "Windows 10", etc. ('name', ' '.join((platform.system(), platform.release()))), ('architecture', platform.machine()), # Windows patch level (e.g. 5.1.2600-SP3) ('version', '-'.join(platform.win32_ver()[1:3])) ]) elif sys.platform.startswith('java'): _name, _ver, _arch = platform.java_ver()[-1] _METADATA['os'] = SON([ # Linux, Windows 7, Mac OS X, etc. ('type', _name), ('name', _name), # x86, x86_64, AMD64, etc. ('architecture', _arch), # Linux kernel version, OSX version, etc. ('version', _ver) ]) else: # Get potential alias (e.g. SunOS 5.11 becomes Solaris 2.11) _aliased = platform.system_alias( platform.system(), platform.release(), platform.version()) _METADATA['os'] = SON([ ('type', platform.system()), ('name', ' '.join([part for part in _aliased[:2] if part])), ('architecture', platform.machine()), ('version', _aliased[2]) ]) if platform.python_implementation().startswith('PyPy'): _METADATA['platform'] = ' '.join( (platform.python_implementation(), '.'.join(imap(str, sys.pypy_version_info)), '(Python %s)' % '.'.join(imap(str, sys.version_info)))) elif sys.platform.startswith('java'): _METADATA['platform'] = ' '.join( (platform.python_implementation(), '.'.join(imap(str, sys.version_info)), '(%s)' % ' '.join((platform.system(), platform.release())))) else: _METADATA['platform'] = ' '.join( (platform.python_implementation(), '.'.join(imap(str, sys.version_info)))) # If the first getaddrinfo call of this interpreter's life is on a thread, # while the main thread holds the import lock, getaddrinfo deadlocks trying # to import the IDNA codec. Import it here, where presumably we're on the # main thread, to avoid the deadlock. See PYTHON-607. u'foo'.encode('idna') def _raise_connection_failure(address, error, msg_prefix=None): """Convert a socket.error to ConnectionFailure and raise it.""" host, port = address # If connecting to a Unix socket, port will be None. if port is not None: msg = '%s:%d: %s' % (host, port, error) else: msg = '%s: %s' % (host, error) if msg_prefix: msg = msg_prefix + msg if isinstance(error, socket.timeout): raise NetworkTimeout(msg) elif isinstance(error, _SSLError) and 'timed out' in str(error): # CPython 2.7 and PyPy 2.x do not distinguish network # timeouts from other SSLErrors (https://bugs.python.org/issue10272). # Luckily, we can work around this limitation because the phrase # 'timed out' appears in all the timeout related SSLErrors raised # on the above platforms. raise NetworkTimeout(msg) else: raise AutoReconnect(msg) class PoolOptions(object): __slots__ = ('__max_pool_size', '__min_pool_size', '__max_idle_time_seconds', '__connect_timeout', '__socket_timeout', '__wait_queue_timeout', '__wait_queue_multiple', '__ssl_context', '__ssl_match_hostname', '__socket_keepalive', '__event_listeners', '__appname', '__driver', '__metadata', '__compression_settings') def __init__(self, max_pool_size=MAX_POOL_SIZE, min_pool_size=MIN_POOL_SIZE, max_idle_time_seconds=MAX_IDLE_TIME_SEC, connect_timeout=None, socket_timeout=None, wait_queue_timeout=WAIT_QUEUE_TIMEOUT, wait_queue_multiple=None, ssl_context=None, ssl_match_hostname=True, socket_keepalive=True, event_listeners=None, appname=None, driver=None, compression_settings=None): self.__max_pool_size = max_pool_size self.__min_pool_size = min_pool_size self.__max_idle_time_seconds = max_idle_time_seconds self.__connect_timeout = connect_timeout self.__socket_timeout = socket_timeout self.__wait_queue_timeout = wait_queue_timeout self.__wait_queue_multiple = wait_queue_multiple self.__ssl_context = ssl_context self.__ssl_match_hostname = ssl_match_hostname self.__socket_keepalive = socket_keepalive self.__event_listeners = event_listeners self.__appname = appname self.__driver = driver self.__compression_settings = compression_settings self.__metadata = copy.deepcopy(_METADATA) if appname: self.__metadata['application'] = {'name': appname} # Combine the "driver" MongoClient option with PyMongo's info, like: # { # 'driver': { # 'name': 'PyMongo|MyDriver', # 'version': '3.7.0|1.2.3', # }, # 'platform': 'CPython 3.6.0|MyPlatform' # } if driver: if driver.name: self.__metadata['driver']['name'] = "%s|%s" % ( _METADATA['driver']['name'], driver.name) if driver.version: self.__metadata['driver']['version'] = "%s|%s" % ( _METADATA['driver']['version'], driver.version) if driver.platform: self.__metadata['platform'] = "%s|%s" % ( _METADATA['platform'], driver.platform) @property def non_default_options(self): """The non-default options this pool was created with. Added for CMAP's :class:`PoolCreatedEvent`. """ opts = {} if self.__max_pool_size != MAX_POOL_SIZE: opts['maxPoolSize'] = self.__max_pool_size if self.__min_pool_size != MIN_POOL_SIZE: opts['minPoolSize'] = self.__min_pool_size if self.__max_idle_time_seconds != MAX_IDLE_TIME_SEC: opts['maxIdleTimeMS'] = self.__max_idle_time_seconds * 1000 if self.__wait_queue_timeout != WAIT_QUEUE_TIMEOUT: opts['waitQueueTimeoutMS'] = self.__wait_queue_timeout * 1000 return opts @property def max_pool_size(self): """The maximum allowable number of concurrent connections to each connected server. Requests to a server will block if there are `maxPoolSize` outstanding connections to the requested server. Defaults to 100. Cannot be 0. When a server's pool has reached `max_pool_size`, operations for that server block waiting for a socket to be returned to the pool. If ``waitQueueTimeoutMS`` is set, a blocked operation will raise :exc:`~pymongo.errors.ConnectionFailure` after a timeout. By default ``waitQueueTimeoutMS`` is not set. """ return self.__max_pool_size @property def min_pool_size(self): """The minimum required number of concurrent connections that the pool will maintain to each connected server. Default is 0. """ return self.__min_pool_size @property def max_idle_time_seconds(self): """The maximum number of seconds that a connection can remain idle in the pool before being removed and replaced. Defaults to `None` (no limit). """ return self.__max_idle_time_seconds @property def connect_timeout(self): """How long a connection can take to be opened before timing out. """ return self.__connect_timeout @property def socket_timeout(self): """How long a send or receive on a socket can take before timing out. """ return self.__socket_timeout @property def wait_queue_timeout(self): """How long a thread will wait for a socket from the pool if the pool has no free sockets. """ return self.__wait_queue_timeout @property def wait_queue_multiple(self): """Multiplied by max_pool_size to give the number of threads allowed to wait for a socket at one time. """ return self.__wait_queue_multiple @property def ssl_context(self): """An SSLContext instance or None. """ return self.__ssl_context @property def ssl_match_hostname(self): """Call ssl.match_hostname if cert_reqs is not ssl.CERT_NONE. """ return self.__ssl_match_hostname @property def socket_keepalive(self): """Whether to send periodic messages to determine if a connection is closed. """ return self.__socket_keepalive @property def event_listeners(self): """An instance of pymongo.monitoring._EventListeners. """ return self.__event_listeners @property def appname(self): """The application name, for sending with ismaster in server handshake. """ return self.__appname @property def driver(self): """Driver name and version, for sending with ismaster in handshake. """ return self.__driver @property def compression_settings(self): return self.__compression_settings @property def metadata(self): """A dict of metadata about the application, driver, os, and platform. """ return self.__metadata.copy() def _negotiate_creds(all_credentials): """Return one credential that needs mechanism negotiation, if any. """ if all_credentials: for creds in all_credentials.values(): if creds.mechanism == 'DEFAULT' and creds.username: return creds return None def _speculative_context(all_credentials): """Return the _AuthContext to use for speculative auth, if any. """ if all_credentials and len(all_credentials) == 1: creds = next(itervalues(all_credentials)) return auth._AuthContext.from_credentials(creds) return None class _CancellationContext(object): def __init__(self): self._cancelled = False def cancel(self): """Cancel this context.""" self._cancelled = True @property def cancelled(self): """Was cancel called?""" return self._cancelled class SocketInfo(object): """Store a socket with some metadata. :Parameters: - `sock`: a raw socket object - `pool`: a Pool instance - `address`: the server's (host, port) - `id`: the id of this socket in it's pool """ def __init__(self, sock, pool, address, id): self.sock = sock self.address = address self.id = id self.authset = set() self.closed = False self.last_checkin_time = _time() self.performed_handshake = False self.is_writable = False self.max_wire_version = MAX_WIRE_VERSION self.max_bson_size = MAX_BSON_SIZE self.max_message_size = MAX_MESSAGE_SIZE self.max_write_batch_size = MAX_WRITE_BATCH_SIZE self.supports_sessions = False self.is_mongos = False self.op_msg_enabled = False self.listeners = pool.opts.event_listeners self.enabled_for_cmap = pool.enabled_for_cmap self.compression_settings = pool.opts.compression_settings self.compression_context = None self.socket_checker = SocketChecker() # Support for mechanism negotiation on the initial handshake. # Maps credential to saslSupportedMechs. self.negotiated_mechanisms = {} self.auth_ctx = {} # The pool's generation changes with each reset() so we can close # sockets created before the last reset. self.generation = pool.generation self.ready = False self.cancel_context = None if not pool.handshake: # This is a Monitor connection. self.cancel_context = _CancellationContext() self.opts = pool.opts self.more_to_come = False def ismaster(self, all_credentials=None): return self._ismaster(None, None, None, all_credentials) def _ismaster(self, cluster_time, topology_version, heartbeat_frequency, all_credentials): cmd = SON([('ismaster', 1)]) performing_handshake = not self.performed_handshake awaitable = False if performing_handshake: self.performed_handshake = True cmd['client'] = self.opts.metadata if self.compression_settings: cmd['compression'] = self.compression_settings.compressors elif topology_version is not None: cmd['topologyVersion'] = topology_version cmd['maxAwaitTimeMS'] = int(heartbeat_frequency*1000) awaitable = True # If connect_timeout is None there is no timeout. if self.opts.connect_timeout: self.sock.settimeout( self.opts.connect_timeout + heartbeat_frequency) if self.max_wire_version >= 6 and cluster_time is not None: cmd['$clusterTime'] = cluster_time # XXX: Simplify in PyMongo 4.0 when all_credentials is always a single # unchangeable value per MongoClient. creds = _negotiate_creds(all_credentials) if creds: cmd['saslSupportedMechs'] = creds.source + '.' + creds.username auth_ctx = _speculative_context(all_credentials) if auth_ctx: cmd['speculativeAuthenticate'] = auth_ctx.speculate_command() doc = self.command('admin', cmd, publish_events=False, exhaust_allowed=awaitable) ismaster = IsMaster(doc, awaitable=awaitable) self.is_writable = ismaster.is_writable self.max_wire_version = ismaster.max_wire_version self.max_bson_size = ismaster.max_bson_size self.max_message_size = ismaster.max_message_size self.max_write_batch_size = ismaster.max_write_batch_size self.supports_sessions = ( ismaster.logical_session_timeout_minutes is not None) self.is_mongos = ismaster.server_type == SERVER_TYPE.Mongos if performing_handshake and self.compression_settings: ctx = self.compression_settings.get_compression_context( ismaster.compressors) self.compression_context = ctx self.op_msg_enabled = ismaster.max_wire_version >= 6 if creds: self.negotiated_mechanisms[creds] = ismaster.sasl_supported_mechs if auth_ctx: auth_ctx.parse_response(ismaster) if auth_ctx.speculate_succeeded(): self.auth_ctx[auth_ctx.credentials] = auth_ctx return ismaster def _next_reply(self): reply = self.receive_message(None) self.more_to_come = reply.more_to_come unpacked_docs = reply.unpack_response() response_doc = unpacked_docs[0] helpers._check_command_response(response_doc, self.max_wire_version) return response_doc def command(self, dbname, spec, slave_ok=False, read_preference=ReadPreference.PRIMARY, codec_options=DEFAULT_CODEC_OPTIONS, check=True, allowable_errors=None, check_keys=False, read_concern=None, write_concern=None, parse_write_concern_error=False, collation=None, session=None, client=None, retryable_write=False, publish_events=True, user_fields=None, exhaust_allowed=False): """Execute a command or raise an error. :Parameters: - `dbname`: name of the database on which to run the command - `spec`: a command document as a dict, SON, or mapping object - `slave_ok`: whether to set the SlaveOkay wire protocol bit - `read_preference`: a read preference - `codec_options`: a CodecOptions instance - `check`: raise OperationFailure if there are errors - `allowable_errors`: errors to ignore if `check` is True - `check_keys`: if True, check `spec` for invalid keys - `read_concern`: The read concern for this command. - `write_concern`: The write concern for this command. - `parse_write_concern_error`: Whether to parse the ``writeConcernError`` field in the command response. - `collation`: The collation for this command. - `session`: optional ClientSession instance. - `client`: optional MongoClient for gossipping $clusterTime. - `retryable_write`: True if this command is a retryable write. - `publish_events`: Should we publish events for this command? - `user_fields` (optional): Response fields that should be decoded using the TypeDecoders from codec_options, passed to bson._decode_all_selective. """ self.validate_session(client, session) session = _validate_session_write_concern(session, write_concern) # Ensure command name remains in first place. if not isinstance(spec, ORDERED_TYPES): spec = SON(spec) if (read_concern and self.max_wire_version < 4 and not read_concern.ok_for_legacy): raise ConfigurationError( 'read concern level of %s is not valid ' 'with a max wire version of %d.' % (read_concern.level, self.max_wire_version)) if not (write_concern is None or write_concern.acknowledged or collation is None): raise ConfigurationError( 'Collation is unsupported for unacknowledged writes.') if (self.max_wire_version >= 5 and write_concern and not write_concern.is_server_default): spec['writeConcern'] = write_concern.document elif self.max_wire_version < 5 and collation is not None: raise ConfigurationError( 'Must be connected to MongoDB 3.4+ to use a collation.') if session: session._apply_to(spec, retryable_write, read_preference) self.send_cluster_time(spec, session, client) listeners = self.listeners if publish_events else None unacknowledged = write_concern and not write_concern.acknowledged if self.op_msg_enabled: self._raise_if_not_writable(unacknowledged) try: return command(self, dbname, spec, slave_ok, self.is_mongos, read_preference, codec_options, session, client, check, allowable_errors, self.address, check_keys, listeners, self.max_bson_size, read_concern, parse_write_concern_error=parse_write_concern_error, collation=collation, compression_ctx=self.compression_context, use_op_msg=self.op_msg_enabled, unacknowledged=unacknowledged, user_fields=user_fields, exhaust_allowed=exhaust_allowed) except OperationFailure: raise # Catch socket.error, KeyboardInterrupt, etc. and close ourselves. except BaseException as error: self._raise_connection_failure(error) def send_message(self, message, max_doc_size): """Send a raw BSON message or raise ConnectionFailure. If a network exception is raised, the socket is closed. """ if (self.max_bson_size is not None and max_doc_size > self.max_bson_size): raise DocumentTooLarge( "BSON document too large (%d bytes) - the connected server " "supports BSON document sizes up to %d bytes." % (max_doc_size, self.max_bson_size)) try: self.sock.sendall(message) except BaseException as error: self._raise_connection_failure(error) def receive_message(self, request_id): """Receive a raw BSON message or raise ConnectionFailure. If any exception is raised, the socket is closed. """ try: return receive_message(self, request_id, self.max_message_size) except BaseException as error: self._raise_connection_failure(error) def _raise_if_not_writable(self, unacknowledged): """Raise NotMasterError on unacknowledged write if this socket is not writable. """ if unacknowledged and not self.is_writable: # Write won't succeed, bail as if we'd received a not master error. raise NotMasterError("not master", { "ok": 0, "errmsg": "not master", "code": 10107}) def legacy_write(self, request_id, msg, max_doc_size, with_last_error): """Send OP_INSERT, etc., optionally returning response as a dict. Can raise ConnectionFailure or OperationFailure. :Parameters: - `request_id`: an int. - `msg`: bytes, an OP_INSERT, OP_UPDATE, or OP_DELETE message, perhaps with a getlasterror command appended. - `max_doc_size`: size in bytes of the largest document in `msg`. - `with_last_error`: True if a getlasterror command is appended. """ self._raise_if_not_writable(not with_last_error) self.send_message(msg, max_doc_size) if with_last_error: reply = self.receive_message(request_id) return helpers._check_gle_response(reply.command_response(), self.max_wire_version) def write_command(self, request_id, msg): """Send "insert" etc. command, returning response as a dict. Can raise ConnectionFailure or OperationFailure. :Parameters: - `request_id`: an int. - `msg`: bytes, the command message. """ self.send_message(msg, 0) reply = self.receive_message(request_id) result = reply.command_response() # Raises NotMasterError or OperationFailure. helpers._check_command_response(result, self.max_wire_version) return result def check_auth(self, all_credentials): """Update this socket's authentication. Log in or out to bring this socket's credentials up to date with those provided. Can raise ConnectionFailure or OperationFailure. :Parameters: - `all_credentials`: dict, maps auth source to MongoCredential. """ if all_credentials or self.authset: cached = set(itervalues(all_credentials)) authset = self.authset.copy() # Logout any credentials that no longer exist in the cache. for credentials in authset - cached: auth.logout(credentials.source, self) self.authset.discard(credentials) for credentials in cached - authset: self.authenticate(credentials) # CMAP spec says to publish the ready event only after authenticating # the connection. if not self.ready: self.ready = True if self.enabled_for_cmap: self.listeners.publish_connection_ready(self.address, self.id) def authenticate(self, credentials): """Log in to the server and store these credentials in `authset`. Can raise ConnectionFailure or OperationFailure. :Parameters: - `credentials`: A MongoCredential. """ auth.authenticate(credentials, self) self.authset.add(credentials) # negotiated_mechanisms are no longer needed. self.negotiated_mechanisms.pop(credentials, None) self.auth_ctx.pop(credentials, None) def validate_session(self, client, session): """Validate this session before use with client. Raises error if this session is logged in as a different user or the client is not the one that created the session. """ if session: if session._client is not client: raise InvalidOperation( 'Can only use session with the MongoClient that' ' started it') if session._authset != self.authset: raise InvalidOperation( 'Cannot use session after authenticating with different' ' credentials') def close_socket(self, reason): """Close this connection with a reason.""" if self.closed: return self._close_socket() if reason and self.enabled_for_cmap: self.listeners.publish_connection_closed( self.address, self.id, reason) def _close_socket(self): """Close this connection.""" if self.closed: return self.closed = True if self.cancel_context: self.cancel_context.cancel() # Note: We catch exceptions to avoid spurious errors on interpreter # shutdown. try: self.sock.close() except Exception: pass def socket_closed(self): """Return True if we know socket has been closed, False otherwise.""" return self.socket_checker.socket_closed(self.sock) def send_cluster_time(self, command, session, client): """Add cluster time for MongoDB >= 3.6.""" if self.max_wire_version >= 6 and client: client._send_cluster_time(command, session) def update_last_checkin_time(self): self.last_checkin_time = _time() def update_is_writable(self, is_writable): self.is_writable = is_writable def idle_time_seconds(self): """Seconds since this socket was last checked into its pool.""" return _time() - self.last_checkin_time def _raise_connection_failure(self, error): # Catch *all* exceptions from socket methods and close the socket. In # regular Python, socket operations only raise socket.error, even if # the underlying cause was a Ctrl-C: a signal raised during socket.recv # is expressed as an EINTR error from poll. See internal_select_ex() in # socketmodule.c. All error codes from poll become socket.error at # first. Eventually in PyEval_EvalFrameEx the interpreter checks for # signals and throws KeyboardInterrupt into the current frame on the # main thread. # # But in Gevent and Eventlet, the polling mechanism (epoll, kqueue, # ...) is called in Python code, which experiences the signal as a # KeyboardInterrupt from the start, rather than as an initial # socket.error, so we catch that, close the socket, and reraise it. self.close_socket(ConnectionClosedReason.ERROR) # SSLError from PyOpenSSL inherits directly from Exception. if isinstance(error, (IOError, OSError, _SSLError)): _raise_connection_failure(self.address, error) else: raise def __eq__(self, other): return self.sock == other.sock def __ne__(self, other): return not self == other def __hash__(self): return hash(self.sock) def __repr__(self): return "SocketInfo(%s)%s at %s" % ( repr(self.sock), self.closed and " CLOSED" or "", id(self) ) def _create_connection(address, options): """Given (host, port) and PoolOptions, connect and return a socket object. Can raise socket.error. This is a modified version of create_connection from CPython >= 2.7. """ host, port = address # Check if dealing with a unix domain socket if host.endswith('.sock'): if not hasattr(socket, "AF_UNIX"): raise ConnectionFailure("UNIX-sockets are not supported " "on this system") sock = socket.socket(socket.AF_UNIX) # SOCK_CLOEXEC not supported for Unix sockets. _set_non_inheritable_non_atomic(sock.fileno()) try: sock.connect(host) return sock except socket.error: sock.close() raise # Don't try IPv6 if we don't support it. Also skip it if host # is 'localhost' (::1 is fine). Avoids slow connect issues # like PYTHON-356. family = socket.AF_INET if socket.has_ipv6 and host != 'localhost': family = socket.AF_UNSPEC err = None for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM): af, socktype, proto, dummy, sa = res # SOCK_CLOEXEC was new in CPython 3.2, and only available on a limited # number of platforms (newer Linux and *BSD). Starting with CPython 3.4 # all file descriptors are created non-inheritable. See PEP 446. try: sock = socket.socket( af, socktype | getattr(socket, 'SOCK_CLOEXEC', 0), proto) except socket.error: # Can SOCK_CLOEXEC be defined even if the kernel doesn't support # it? sock = socket.socket(af, socktype, proto) # Fallback when SOCK_CLOEXEC isn't available. _set_non_inheritable_non_atomic(sock.fileno()) try: sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1) sock.settimeout(options.connect_timeout) sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, options.socket_keepalive) if options.socket_keepalive: _set_keepalive_times(sock) sock.connect(sa) return sock except socket.error as e: err = e sock.close() if err is not None: raise err else: # This likely means we tried to connect to an IPv6 only # host with an OS/kernel or Python interpreter that doesn't # support IPv6. The test case is Jython2.5.1 which doesn't # support IPv6 at all. raise socket.error('getaddrinfo failed') def _configured_socket(address, options): """Given (host, port) and PoolOptions, return a configured socket. Can raise socket.error, ConnectionFailure, or CertificateError. Sets socket's SSL and timeout options. """ sock = _create_connection(address, options) ssl_context = options.ssl_context if ssl_context is not None: host = address[0] try: # According to RFC6066, section 3, IPv4 and IPv6 literals are # not permitted for SNI hostname. # Previous to Python 3.7 wrap_socket would blindly pass # IP addresses as SNI hostname. # https://bugs.python.org/issue32185 # We have to pass hostname / ip address to wrap_socket # to use SSLContext.check_hostname. if _HAVE_SNI and (not is_ip_address(host) or _IPADDR_SAFE): sock = ssl_context.wrap_socket(sock, server_hostname=host) else: sock = ssl_context.wrap_socket(sock) except CertificateError: sock.close() # Raise CertificateError directly like we do after match_hostname # below. raise except (IOError, OSError, _SSLError) as exc: sock.close() # We raise AutoReconnect for transient and permanent SSL handshake # failures alike. Permanent handshake failures, like protocol # mismatch, will be turned into ServerSelectionTimeoutErrors later. _raise_connection_failure(address, exc, "SSL handshake failed: ") if (ssl_context.verify_mode and not getattr(ssl_context, "check_hostname", False) and options.ssl_match_hostname): try: match_hostname(sock.getpeercert(), hostname=host) except CertificateError: sock.close() raise sock.settimeout(options.socket_timeout) return sock class _PoolClosedError(PyMongoError): """Internal error raised when a thread tries to get a connection from a closed pool. """ pass # Do *not* explicitly inherit from object or Jython won't call __del__ # http://bugs.jython.org/issue1057 class Pool: def __init__(self, address, options, handshake=True): """ :Parameters: - `address`: a (hostname, port) tuple - `options`: a PoolOptions instance - `handshake`: whether to call ismaster for each new SocketInfo """ # Check a socket's health with socket_closed() every once in a while. # Can override for testing: 0 to always check, None to never check. self._check_interval_seconds = 1 # LIFO pool. Sockets are ordered on idle time. Sockets claimed # and returned to pool from the left side. Stale sockets removed # from the right side. self.sockets = collections.deque() self.lock = threading.Lock() self.active_sockets = 0 # Monotonically increasing connection ID required for CMAP Events. self.next_connection_id = 1 self.closed = False # Track whether the sockets in this pool are writeable or not. self.is_writable = None # Keep track of resets, so we notice sockets created before the most # recent reset and close them. self.generation = 0 self.pid = os.getpid() self.address = address self.opts = options self.handshake = handshake # Don't publish events in Monitor pools. self.enabled_for_cmap = ( self.handshake and self.opts.event_listeners is not None and self.opts.event_listeners.enabled_for_cmap) if (self.opts.wait_queue_multiple is None or self.opts.max_pool_size is None): max_waiters = None else: max_waiters = ( self.opts.max_pool_size * self.opts.wait_queue_multiple) self._socket_semaphore = thread_util.create_semaphore( self.opts.max_pool_size, max_waiters) if self.enabled_for_cmap: self.opts.event_listeners.publish_pool_created( self.address, self.opts.non_default_options) def _reset(self, close): with self.lock: if self.closed: return self.generation += 1 self.pid = os.getpid() sockets, self.sockets = self.sockets, collections.deque() self.active_sockets = 0 if close: self.closed = True listeners = self.opts.event_listeners # CMAP spec says that close() MUST close sockets before publishing the # PoolClosedEvent but that reset() SHOULD close sockets *after* # publishing the PoolClearedEvent. if close: for sock_info in sockets: sock_info.close_socket(ConnectionClosedReason.POOL_CLOSED) if self.enabled_for_cmap: listeners.publish_pool_closed(self.address) else: if self.enabled_for_cmap: listeners.publish_pool_cleared(self.address) for sock_info in sockets: sock_info.close_socket(ConnectionClosedReason.STALE) def update_is_writable(self, is_writable): """Updates the is_writable attribute on all sockets currently in the Pool. """ self.is_writable = is_writable with self.lock: for socket in self.sockets: socket.update_is_writable(self.is_writable) def reset(self): self._reset(close=False) def close(self): self._reset(close=True) def remove_stale_sockets(self, reference_generation, all_credentials): """Removes stale sockets then adds new ones if pool is too small and has not been reset. The `reference_generation` argument specifies the `generation` at the point in time this operation was requested on the pool. """ if self.opts.max_idle_time_seconds is not None: with self.lock: while (self.sockets and self.sockets[-1].idle_time_seconds() > self.opts.max_idle_time_seconds): sock_info = self.sockets.pop() sock_info.close_socket(ConnectionClosedReason.IDLE) while True: with self.lock: if (len(self.sockets) + self.active_sockets >= self.opts.min_pool_size): # There are enough sockets in the pool. break # We must acquire the semaphore to respect max_pool_size. if not self._socket_semaphore.acquire(False): break try: sock_info = self.connect(all_credentials) with self.lock: # Close connection and return if the pool was reset during # socket creation or while acquiring the pool lock. if self.generation != reference_generation: sock_info.close_socket(ConnectionClosedReason.STALE) break self.sockets.appendleft(sock_info) finally: self._socket_semaphore.release() def connect(self, all_credentials=None): """Connect to Mongo and return a new SocketInfo. Can raise ConnectionFailure or CertificateError. Note that the pool does not keep a reference to the socket -- you must call return_socket() when you're done with it. """ with self.lock: conn_id = self.next_connection_id self.next_connection_id += 1 listeners = self.opts.event_listeners if self.enabled_for_cmap: listeners.publish_connection_created(self.address, conn_id) try: sock = _configured_socket(self.address, self.opts) except Exception as error: if self.enabled_for_cmap: listeners.publish_connection_closed( self.address, conn_id, ConnectionClosedReason.ERROR) if isinstance(error, (IOError, OSError, _SSLError)): _raise_connection_failure(self.address, error) raise sock_info = SocketInfo(sock, self, self.address, conn_id) if self.handshake: sock_info.ismaster(all_credentials) self.is_writable = sock_info.is_writable try: sock_info.check_auth(all_credentials) except Exception: sock_info.close_socket(ConnectionClosedReason.ERROR) raise return sock_info @contextlib.contextmanager def get_socket(self, all_credentials, checkout=False): """Get a socket from the pool. Use with a "with" statement. Returns a :class:`SocketInfo` object wrapping a connected :class:`socket.socket`. This method should always be used in a with-statement:: with pool.get_socket(credentials, checkout) as socket_info: socket_info.send_message(msg) data = socket_info.receive_message(op_code, request_id) The socket is logged in or out as needed to match ``all_credentials`` using the correct authentication mechanism for the server's wire protocol version. Can raise ConnectionFailure or OperationFailure. :Parameters: - `all_credentials`: dict, maps auth source to MongoCredential. - `checkout` (optional): keep socket checked out. """ listeners = self.opts.event_listeners if self.enabled_for_cmap: listeners.publish_connection_check_out_started(self.address) sock_info = self._get_socket(all_credentials) if self.enabled_for_cmap: listeners.publish_connection_checked_out( self.address, sock_info.id) try: yield sock_info except: # Exception in caller. Decrement semaphore. self.return_socket(sock_info) raise else: if not checkout: self.return_socket(sock_info) def _get_socket(self, all_credentials): """Get or create a SocketInfo. Can raise ConnectionFailure.""" # We use the pid here to avoid issues with fork / multiprocessing. # See test.test_client:TestClient.test_fork for an example of # what could go wrong otherwise if self.pid != os.getpid(): self.reset() if self.closed: if self.enabled_for_cmap: self.opts.event_listeners.publish_connection_check_out_failed( self.address, ConnectionCheckOutFailedReason.POOL_CLOSED) raise _PoolClosedError( 'Attempted to check out a connection from closed connection ' 'pool') # Get a free socket or create one. if not self._socket_semaphore.acquire( True, self.opts.wait_queue_timeout): self._raise_wait_queue_timeout() # We've now acquired the semaphore and must release it on error. sock_info = None incremented = False try: with self.lock: self.active_sockets += 1 incremented = True while sock_info is None: try: with self.lock: sock_info = self.sockets.popleft() except IndexError: # Can raise ConnectionFailure or CertificateError. sock_info = self.connect(all_credentials) else: if self._perished(sock_info): sock_info = None sock_info.check_auth(all_credentials) except Exception: if sock_info: # We checked out a socket but authentication failed. sock_info.close_socket(ConnectionClosedReason.ERROR) self._socket_semaphore.release() if incremented: with self.lock: self.active_sockets -= 1 if self.enabled_for_cmap: self.opts.event_listeners.publish_connection_check_out_failed( self.address, ConnectionCheckOutFailedReason.CONN_ERROR) raise return sock_info def return_socket(self, sock_info): """Return the socket to the pool, or if it's closed discard it. :Parameters: - `sock_info`: The socket to check into the pool. """ listeners = self.opts.event_listeners if self.enabled_for_cmap: listeners.publish_connection_checked_in(self.address, sock_info.id) if self.pid != os.getpid(): self.reset() else: if self.closed: sock_info.close_socket(ConnectionClosedReason.POOL_CLOSED) elif not sock_info.closed: with self.lock: # Hold the lock to ensure this section does not race with # Pool.reset(). if sock_info.generation != self.generation: sock_info.close_socket(ConnectionClosedReason.STALE) else: sock_info.update_last_checkin_time() sock_info.update_is_writable(self.is_writable) self.sockets.appendleft(sock_info) self._socket_semaphore.release() with self.lock: self.active_sockets -= 1 def _perished(self, sock_info): """Return True and close the connection if it is "perished". This side-effecty function checks if this socket has been idle for for longer than the max idle time, or if the socket has been closed by some external network error, or if the socket's generation is outdated. Checking sockets lets us avoid seeing *some* :class:`~pymongo.errors.AutoReconnect` exceptions on server hiccups, etc. We only check if the socket was closed by an external error if it has been > 1 second since the socket was checked into the pool, to keep performance reasonable - we can't avoid AutoReconnects completely anyway. """ idle_time_seconds = sock_info.idle_time_seconds() # If socket is idle, open a new one. if (self.opts.max_idle_time_seconds is not None and idle_time_seconds > self.opts.max_idle_time_seconds): sock_info.close_socket(ConnectionClosedReason.IDLE) return True if (self._check_interval_seconds is not None and ( 0 == self._check_interval_seconds or idle_time_seconds > self._check_interval_seconds)): if sock_info.socket_closed(): sock_info.close_socket(ConnectionClosedReason.ERROR) return True if sock_info.generation != self.generation: sock_info.close_socket(ConnectionClosedReason.STALE) return True return False def _raise_wait_queue_timeout(self): listeners = self.opts.event_listeners if self.enabled_for_cmap: listeners.publish_connection_check_out_failed( self.address, ConnectionCheckOutFailedReason.TIMEOUT) raise ConnectionFailure( 'Timed out while checking out a connection from connection pool ' 'with max_size %r and wait_queue_timeout %r' % ( self.opts.max_pool_size, self.opts.wait_queue_timeout)) def __del__(self): # Avoid ResourceWarnings in Python 3 # Close all sockets without calling reset() or close() because it is # not safe to acquire a lock in __del__. for sock_info in self.sockets: sock_info.close_socket(None)