# Python implementation of the MySQL client-server protocol
# http://dev.mysql.com/doc/internals/en/client-server-protocol.html
# Error codes:
# http://dev.mysql.com/doc/refman/5.5/en/error-messages-client.html
from __future__ import print_function
from ._compat import PY2, range_type, text_type, str_type, JYTHON, IRONPYTHON
import errno
from functools import partial
import hashlib
import io
import os
import socket
import struct
import sys
import traceback
import warnings
from .charset import MBLENGTH, charset_by_name, charset_by_id
from .constants import CLIENT, COMMAND, CR, FIELD_TYPE, SERVER_STATUS
from .converters import escape_item, escape_string, through, conversions as _conv
from .cursors import Cursor
from .optionfile import Parser
from .util import byte2int, int2byte
from . import err
try:
import ssl
SSL_ENABLED = True
except ImportError:
ssl = None
SSL_ENABLED = False
try:
import getpass
DEFAULT_USER = getpass.getuser()
del getpass
except (ImportError, KeyError):
# KeyError occurs when there's no entry in OS database for a current user.
DEFAULT_USER = None
DEBUG = False
_py_version = sys.version_info[:2]
# socket.makefile() in Python 2 is not usable because very inefficient and
# bad behavior about timeout.
# XXX: ._socketio doesn't work under IronPython.
if _py_version == (2, 7) and not IRONPYTHON:
# read method of file-like returned by sock.makefile() is very slow.
# So we copy io-based one from Python 3.
from ._socketio import SocketIO
def _makefile(sock, mode):
return io.BufferedReader(SocketIO(sock, mode))
elif _py_version == (2, 6):
# Python 2.6 doesn't have fast io module.
# So we make original one.
class SockFile(object):
def __init__(self, sock):
self._sock = sock
def read(self, n):
read = self._sock.recv(n)
if len(read) == n:
return read
while True:
data = self._sock.recv(n-len(read))
if not data:
return read
read += data
if len(read) == n:
return read
def _makefile(sock, mode):
assert mode == 'rb'
return SockFile(sock)
else:
# socket.makefile in Python 3 is nice.
def _makefile(sock, mode):
return sock.makefile(mode)
TEXT_TYPES = set([
FIELD_TYPE.BIT,
FIELD_TYPE.BLOB,
FIELD_TYPE.LONG_BLOB,
FIELD_TYPE.MEDIUM_BLOB,
FIELD_TYPE.STRING,
FIELD_TYPE.TINY_BLOB,
FIELD_TYPE.VAR_STRING,
FIELD_TYPE.VARCHAR,
FIELD_TYPE.GEOMETRY])
sha_new = partial(hashlib.new, 'sha1')
NULL_COLUMN = 251
UNSIGNED_CHAR_COLUMN = 251
UNSIGNED_SHORT_COLUMN = 252
UNSIGNED_INT24_COLUMN = 253
UNSIGNED_INT64_COLUMN = 254
DEFAULT_CHARSET = 'latin1'
MAX_PACKET_LEN = 2**24-1
def dump_packet(data): # pragma: no cover
def is_ascii(data):
if 65 <= byte2int(data) <= 122:
if isinstance(data, int):
return chr(data)
return data
return '.'
try:
print("packet length:", len(data))
for i in range(1, 6):
f = sys._getframe(i)
print("call[%d]: %s (line %d)" % (i, f.f_code.co_name, f.f_lineno))
print("-" * 66)
except ValueError:
pass
dump_data = [data[i:i+16] for i in range_type(0, min(len(data), 256), 16)]
for d in dump_data:
print(' '.join(map(lambda x: "{:02X}".format(byte2int(x)), d)) +
' ' * (16 - len(d)) + ' ' * 2 +
''.join(map(lambda x: "{}".format(is_ascii(x)), d)))
print("-" * 66)
print()
SCRAMBLE_LENGTH = 20
def _scramble(password, message):
if not password:
return b''
if DEBUG: print('password=' + str(password))
stage1 = sha_new(password).digest()
stage2 = sha_new(stage1).digest()
s = sha_new()
s.update(message[:SCRAMBLE_LENGTH])
s.update(stage2)
result = s.digest()
return _my_crypt(result, stage1)
def _my_crypt(message1, message2):
length = len(message1)
result = b''
for i in range_type(length):
x = (struct.unpack('B', message1[i:i+1])[0] ^
struct.unpack('B', message2[i:i+1])[0])
result += struct.pack('B', x)
return result
# old_passwords support ported from libmysql/password.c
SCRAMBLE_LENGTH_323 = 8
class RandStruct_323(object):
def __init__(self, seed1, seed2):
self.max_value = 0x3FFFFFFF
self.seed1 = seed1 % self.max_value
self.seed2 = seed2 % self.max_value
def my_rnd(self):
self.seed1 = (self.seed1 * 3 + self.seed2) % self.max_value
self.seed2 = (self.seed1 + self.seed2 + 33) % self.max_value
return float(self.seed1) / float(self.max_value)
def _scramble_323(password, message):
hash_pass = _hash_password_323(password)
hash_message = _hash_password_323(message[:SCRAMBLE_LENGTH_323])
hash_pass_n = struct.unpack(">LL", hash_pass)
hash_message_n = struct.unpack(">LL", hash_message)
rand_st = RandStruct_323(hash_pass_n[0] ^ hash_message_n[0],
hash_pass_n[1] ^ hash_message_n[1])
outbuf = io.BytesIO()
for _ in range_type(min(SCRAMBLE_LENGTH_323, len(message))):
outbuf.write(int2byte(int(rand_st.my_rnd() * 31) + 64))
extra = int2byte(int(rand_st.my_rnd() * 31))
out = outbuf.getvalue()
outbuf = io.BytesIO()
for c in out:
outbuf.write(int2byte(byte2int(c) ^ byte2int(extra)))
return outbuf.getvalue()
def _hash_password_323(password):
nr = 1345345333
add = 7
nr2 = 0x12345671
# x in py3 is numbers, p27 is chars
for c in [byte2int(x) for x in password if x not in (' ', ' ', 32, 9)]:
nr ^= (((nr & 63) + add) * c) + (nr << 8) & 0xFFFFFFFF
nr2 = (nr2 + ((nr2 << 8) ^ nr)) & 0xFFFFFFFF
add = (add + c) & 0xFFFFFFFF
r1 = nr & ((1 << 31) - 1) # kill sign bits
r2 = nr2 & ((1 << 31) - 1)
return struct.pack(">LL", r1, r2)
def pack_int24(n):
return struct.pack('<I', n)[:3]
# https://dev.mysql.com/doc/internals/en/integer.html#packet-Protocol::LengthEncodedInteger
def lenenc_int(i):
if (i < 0):
raise ValueError("Encoding %d is less than 0 - no representation in LengthEncodedInteger" % i)
elif (i < 0xfb):
return int2byte(i)
elif (i < (1 << 16)):
return b'xfc' + struct.pack('<H', i)
elif (i < (1 << 24)):
return b'xfd' + struct.pack('<I', i)[:3]
elif (i < (1 << 64)):
return b'xfe' + struct.pack('<Q', i)
else:
raise ValueError("Encoding %x is larger than %x - no representation in LengthEncodedInteger" % (i, (1 << 64)))
class MysqlPacket(object):
"""Representation of a MySQL response packet.
Provides an interface for reading/parsing the packet results.
"""
__slots__ = ('_position', '_data')
def __init__(self, data, encoding):
self._position = 0
self._data = data
def get_all_data(self):
return self._data
def read(self, size):
"""Read the first 'size' bytes in packet and advance cursor past them."""
result = self._data[self._position:(self._position+size)]
if len(result) != size:
error = ('Result length not requested length:
'
'Expected=%s. Actual=%s. Position: %s. Data Length: %s'
% (size, len(result), self._position, len(self._data)))
if DEBUG:
print(error)
self.dump()
raise AssertionError(error)
self._position += size
return result
def read_all(self):
"""Read all remaining data in the packet.
(Subsequent read() will return errors.)
"""
result = self._data[self._position:]
self._position = None # ensure no subsequent read()
return result
def advance(self, length):
"""Advance the cursor in data buffer 'length' bytes."""
new_position = self._position + length
if new_position < 0 or new_position > len(self._data):
raise Exception('Invalid advance amount (%s) for cursor. '
'Position=%s' % (length, new_position))
self._position = new_position
def rewind(self, position=0):
"""Set the position of the data buffer cursor to 'position'."""
if position < 0 or position > len(self._data):
raise Exception("Invalid position to rewind cursor to: %s." % position)
self._position = position
def get_bytes(self, position, length=1):
"""Get 'length' bytes starting at 'position'.
Position is start of payload (first four packet header bytes are not
included) starting at index '0'.
No error checking is done. If requesting outside end of buffer
an empty string (or string shorter than 'length') may be returned!
"""
return self._data[position:(position+length)]
if PY2:
def read_uint8(self):
result = ord(self._data[self._position])
self._position += 1
return result
else:
def read_uint8(self):
result = self._data[self._position]
self._position += 1
return result
def read_uint16(self):
result = struct.unpack_from('<H', self._data, self._position)[0]
self._position += 2
return result
def read_uint24(self):
low, high = struct.unpack_from('<HB', self._data, self._position)
self._position += 3
return low + (high << 16)
def read_uint32(self):
result = struct.unpack_from('<I', self._data, self._position)[0]
self._position += 4
return result
def read_uint64(self):
result = struct.unpack_from('<Q', self._data, self._position)[0]
self._position += 8
return result
def read_string(self):
end_pos = self._data.find(b' ', self._position)
if end_pos < 0:
return None
result = self._data[self._position:end_pos]
self._position = end_pos + 1
return result
def read_length_encoded_integer(self):
"""Read a 'Length Coded Binary' number from the data buffer.
Length coded numbers can be anywhere from 1 to 9 bytes depending
on the value of the first byte.
"""
c = self.read_uint8()
if c == NULL_COLUMN:
return None
if c < UNSIGNED_CHAR_COLUMN:
return c
elif c == UNSIGNED_SHORT_COLUMN:
return self.read_uint16()
elif c == UNSIGNED_INT24_COLUMN:
return self.read_uint24()
elif c == UNSIGNED_INT64_COLUMN:
return self.read_uint64()
def read_length_coded_string(self):
"""Read a 'Length Coded String' from the data buffer.
A 'Length Coded String' consists first of a length coded
(unsigned, positive) integer represented in 1-9 bytes followed by
that many bytes of binary data. (For example "cat" would be "3cat".)
"""
length = self.read_length_encoded_integer()
if length is None:
return None
return self.read(length)
def read_struct(self, fmt):
s = struct.Struct(fmt)
result = s.unpack_from(self._data, self._position)
self._position += s.size
return result
def is_ok_packet(self):
# https://dev.mysql.com/doc/internals/en/packet-OK_Packet.html
return self._data[0:1] == b' ' and len(self._data) >= 7
def is_eof_packet(self):
# http://dev.mysql.com/doc/internals/en/generic-response-packets.html#packet-EOF_Packet
# Caution: xFE may be LengthEncodedInteger.
# If xFE is LengthEncodedInteger header, 8bytes followed.
return self._data[0:1] == b'xfe' and len(self._data) < 9
def is_auth_switch_request(self):
# http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::AuthSwitchRequest
return self._data[0:1] == b'xfe'
def is_resultset_packet(self):
field_count = ord(self._data[0:1])
return 1 <= field_count <= 250
def is_load_local_packet(self):
return self._data[0:1] == b'xfb'
def is_error_packet(self):
return self._data[0:1] == b'xff'
def check_error(self):
if self.is_error_packet():
self.rewind()
self.advance(1) # field_count == error (we already know that)
errno = self.read_uint16()
if DEBUG: print("errno =", errno)
err.raise_mysql_exception(self._data)
def dump(self):
dump_packet(self._data)
class FieldDescriptorPacket(MysqlPacket):
"""A MysqlPacket that represents a specific column's metadata in the result.
Parsing is automatically done and the results are exported via public
attributes on the class such as: db, table_name, name, length, type_code.
"""
def __init__(self, data, encoding):
MysqlPacket.__init__(self, data, encoding)
self._parse_field_descriptor(encoding)
def _parse_field_descriptor(self, encoding):
"""Parse the 'Field Descriptor' (Metadata) packet.
This is compatible with MySQL 4.1+ (not compatible with MySQL 4.0).
"""
self.catalog = self.read_length_coded_string()
self.db = self.read_length_coded_string()
self.table_name = self.read_length_coded_string().decode(encoding)
self.org_table = self.read_length_coded_string().decode(encoding)
self.name = self.read_length_coded_string().decode(encoding)
self.org_name = self.read_length_coded_string().decode(encoding)
self.charsetnr, self.length, self.type_code, self.flags, self.scale = (
self.read_struct('<xHIBHBxx'))
# 'default' is a length coded binary and is still in the buffer?
# not used for normal result sets...
def description(self):
"""Provides a 7-item tuple compatible with the Python PEP249 DB Spec."""
return (
self.name,
self.type_code,
None, # TODO: display_length; should this be self.length?
self.get_column_length(), # 'internal_size'
self.get_column_length(), # 'precision' # TODO: why!?!?
self.scale,
self.flags % 2 == 0)
def get_column_length(self):
if self.type_code == FIELD_TYPE.VAR_STRING:
mblen = MBLENGTH.get(self.charsetnr, 1)
return self.length // mblen
return self.length
def __str__(self):
return ('%s %r.%r.%r, type=%s, flags=%x'
% (self.__class__, self.db, self.table_name, self.name,
self.type_code, self.flags))
class OKPacketWrapper(object):
"""
OK Packet Wrapper. It uses an existing packet object, and wraps
around it, exposing useful variables while still providing access
to the original packet objects variables and methods.
"""
def __init__(self, from_packet):
if not from_packet.is_ok_packet():
raise ValueError('Cannot create ' + str(self.__class__.__name__) +
' object from invalid packet type')
self.packet = from_packet
self.packet.advance(1)
self.affected_rows = self.packet.read_length_encoded_integer()
self.insert_id = self.packet.read_length_encoded_integer()
self.server_status, self.warning_count = self.read_struct('<HH')
self.message = self.packet.read_all()
self.has_next = self.server_status & SERVER_STATUS.SERVER_MORE_RESULTS_EXISTS
def __getattr__(self, key):
return getattr(self.packet, key)
class EOFPacketWrapper(object):
"""
EOF Packet Wrapper. It uses an existing packet object, and wraps
around it, exposing useful variables while still providing access
to the original packet objects variables and methods.
"""
def __init__(self, from_packet):
if not from_packet.is_eof_packet():
raise ValueError(
"Cannot create '{0}' object from invalid packet type".format(
self.__class__))
self.packet = from_packet
self.warning_count, self.server_status = self.packet.read_struct('<xhh')
if DEBUG: print("server_status=", self.server_status)
self.has_next = self.server_status & SERVER_STATUS.SERVER_MORE_RESULTS_EXISTS
def __getattr__(self, key):
return getattr(self.packet, key)
class LoadLocalPacketWrapper(object):
"""
Load Local Packet Wrapper. It uses an existing packet object, and wraps
around it, exposing useful variables while still providing access
to the original packet objects variables and methods.
"""
def __init__(self, from_packet):
if not from_packet.is_load_local_packet():
raise ValueError(
"Cannot create '{0}' object from invalid packet type".format(
self.__class__))
self.packet = from_packet
self.filename = self.packet.get_all_data()[1:]
if DEBUG: print("filename=", self.filename)
def __getattr__(self, key):
return getattr(self.packet, key)
class Connection(object):
"""
Representation of a socket with a mysql server.
The proper way to get an instance of this class is to call
connect().
Establish a connection to the MySQL database. Accepts several
arguments:
:param host: Host where the database server is located
:param user: Username to log in as
:param password: Password to use.
:param database: Database to use, None to not use a particular one.
:param port: MySQL port to use, default is usually OK. (default: 3306)
:param bind_address: When the client has multiple network interfaces, specify
the interface from which to connect to the host. Argument can be
a hostname or an IP address.
:param unix_socket: Optionally, you can use a unix socket rather than TCP/IP.
:param charset: Charset you want to use.
:param sql_mode: Default SQL_MODE to use.
:param read_default_file:
Specifies my.cnf file to read these parameters from under the [client] section.
:param conv:
Conversion dictionary to use instead of the default one.
This is used to provide custom marshalling and unmarshaling of types.
See converters.
:param use_unicode:
Whether or not to default to unicode strings.
This option defaults to true for Py3k.
:param client_flag: Custom flags to send to MySQL. Find potential values in constants.CLIENT.
:param cursorclass: Custom cursor class to use.
:param init_command: Initial SQL statement to run when connection is established.
:param connect_timeout: Timeout before throwing an exception when connecting.
(default: 10, min: 1, max: 31536000)
:param ssl:
A dict of arguments similar to mysql_ssl_set()'s parameters.
For now the capath and cipher arguments are not supported.
:param read_default_group: Group to read from in the configuration file.
:param compress: Not supported
:param named_pipe: Not supported
:param autocommit: Autocommit mode. None means use server default. (default: False)
:param local_infile: Boolean to enable the use of LOAD DATA LOCAL command. (default: False)
:param max_allowed_packet: Max size of packet sent to server in bytes. (default: 16MB)
Only used to limit size of "LOAD LOCAL INFILE" data packet smaller than default (16KB).
:param defer_connect: Don't explicitly connect on contruction - wait for connect call.
(default: False)
:param auth_plugin_map: A dict of plugin names to a class that processes that plugin.
The class will take the Connection object as the argument to the constructor.
The class needs an authenticate method taking an authentication packet as
an argument. For the dialog plugin, a prompt(echo, prompt) method can be used
(if no authenticate method) for returning a string from the user. (experimental)
:param db: Alias for database. (for compatibility to MySQLdb)
:param passwd: Alias for password. (for compatibility to MySQLdb)
"""
_sock = None
_auth_plugin_name = ''
_closed = False
def __init__(self, host=None, user=None, password="",
database=None, port=0, unix_socket=None,
charset='', sql_mode=None,
read_default_file=None, conv=None, use_unicode=None,
client_flag=0, cursorclass=Cursor, init_command=None,
connect_timeout=10, ssl=None, read_default_group=None,
compress=None, named_pipe=None, no_delay=None,
autocommit=False, db=None, passwd=None, local_infile=False,
max_allowed_packet=16*1024*1024, defer_connect=False,
auth_plugin_map={}, read_timeout=None, write_timeout=None,
bind_address=None):
if no_delay is not None:
warnings.warn("no_delay option is deprecated", DeprecationWarning)
if use_unicode is None and sys.version_info[0] > 2:
use_unicode = True
if db is not None and database is None:
database = db
if passwd is not None and not password:
password = passwd
if compress or named_pipe:
raise NotImplementedError("compress and named_pipe arguments are not supported")
self._local_infile = bool(local_infile)
if self._local_infile:
client_flag |= CLIENT.LOCAL_FILES
if read_default_group and not read_default_file:
if sys.platform.startswith("win"):
read_default_file = "c:\my.ini"
else:
read_default_file = "/etc/my.cnf"
if read_default_file:
if not read_default_group:
read_default_group = "client"
cfg = Parser()
cfg.read(os.path.expanduser(read_default_file))
def _config(key, arg):
if arg:
return arg
try:
return cfg.get(read_default_group, key)
except Exception:
return arg
user = _config("user", user)
password = _config("password", password)
host = _config("host", host)
database = _config("database", database)
unix_socket = _config("socket", unix_socket)
port = int(_config("port", port))
bind_address = _config("bind-address", bind_address)
charset = _config("default-character-set", charset)
if not ssl:
ssl = {}
if isinstance(ssl, dict):
for key in ["ca", "capath", "cert", "key", "cipher"]:
value = _config("ssl-" + key, ssl.get(key))
if value:
ssl[key] = value
self.ssl = False
if ssl:
if not SSL_ENABLED:
raise NotImplementedError("ssl module not found")
self.ssl = True
client_flag |= CLIENT.SSL
self.ctx = self._create_ssl_ctx(ssl)
self.host = host or "localhost"
self.port = port or 3306
self.user = user or DEFAULT_USER
self.password = password or ""
self.db = database
self.unix_socket = unix_socket
self.bind_address = bind_address
if not (0 < connect_timeout <= 31536000):
raise ValueError("connect_timeout should be >0 and <=31536000")
self.connect_timeout = connect_timeout or None
if read_timeout is not None and read_timeout <= 0:
raise ValueError("read_timeout should be >= 0")
self._read_timeout = read_timeout
if write_timeout is not None and write_timeout <= 0:
raise ValueError("write_timeout should be >= 0")
self._write_timeout = write_timeout
if charset:
self.charset = charset
self.use_unicode = True
else:
self.charset = DEFAULT_CHARSET
self.use_unicode = False
if use_unicode is not None:
self.use_unicode = use_unicode
self.encoding = charset_by_name(self.charset).encoding
client_flag |= CLIENT.CAPABILITIES
if self.db:
client_flag |= CLIENT.CONNECT_WITH_DB
self.client_flag = client_flag
self.cursorclass = cursorclass
self._result = None
self._affected_rows = 0
self.host_info = "Not connected"
#: specified autocommit mode. None means use server default.
self.autocommit_mode = autocommit
if conv is None:
conv = _conv
# Need for MySQLdb compatibility.
self.encoders = dict([(k, v) for (k, v) in conv.items() if type(k) is not int])
self.decoders = dict([(k, v) for (k, v) in conv.items() if type(k) is int])
self.sql_mode = sql_mode
self.init_command = init_command
self.max_allowed_packet = max_allowed_packet
self._auth_plugin_map = auth_plugin_map
if defer_connect:
self._sock = None
else:
self.connect()
def _create_ssl_ctx(self, sslp):
if isinstance(sslp, ssl.SSLContext):
return sslp
ca = sslp.get('ca')
capath = sslp.get('capath')
hasnoca = ca is None and capath is None
ctx = ssl.create_default_context(cafile=ca, capath=capath)
ctx.check_hostname = not hasnoca and sslp.get('check_hostname', True)
ctx.verify_mode = ssl.CERT_NONE if hasnoca else ssl.CERT_REQUIRED
if 'cert' in sslp:
ctx.load_cert_chain(sslp['cert'], keyfile=sslp.get('key'))
if 'cipher' in sslp:
ctx.set_ciphers(sslp['cipher'])
ctx.options |= ssl.OP_NO_SSLv2
ctx.options |= ssl.OP_NO_SSLv3
return ctx
def close(self):
"""Send the quit message and close the socket"""
if self._closed:
raise err.Error("Already closed")
self._closed = True
if self._sock is None:
return
send_data = struct.pack('<iB', 1, COMMAND.COM_QUIT)
try:
self._write_bytes(send_data)
except Exception:
pass
finally:
self._force_close()
@property
def open(self):
return self._sock is not None
def _force_close(self):
"""Close connection without QUIT message"""
if self._sock:
try:
self._sock.close()
except:
pass
self._sock = None
self._rfile = None
__del__ = _force_close
def autocommit(self, value):
self.autocommit_mode = bool(value)
current = self.get_autocommit()
if value != current:
self._send_autocommit_mode()
def get_autocommit(self):
return bool(self.server_status &
SERVER_STATUS.SERVER_STATUS_AUTOCOMMIT)
def _read_ok_packet(self):
pkt = self._read_packet()
if not pkt.is_ok_packet():
raise err.OperationalError(2014, "Command Out of Sync")
ok = OKPacketWrapper(pkt)
self.server_status = ok.server_status
return ok
def _send_autocommit_mode(self):
"""Set whether or not to commit after every execute()"""
self._execute_command(COMMAND.COM_QUERY, "SET AUTOCOMMIT = %s" %
self.escape(self.autocommit_mode))
self._read_ok_packet()
def begin(self):
"""Begin transaction."""
self._execute_command(COMMAND.COM_QUERY, "BEGIN")
self._read_ok_packet()
def commit(self):
"""Commit changes to stable storage"""
self._execute_command(COMMAND.COM_QUERY, "COMMIT")
self._read_ok_packet()
def rollback(self):
"""Roll back the current transaction"""
self._execute_command(COMMAND.COM_QUERY, "ROLLBACK")
self._read_ok_packet()
def show_warnings(self):
"""SHOW WARNINGS"""
self._execute_command(COMMAND.COM_QUERY, "SHOW WARNINGS")
result = MySQLResult(self)
result.read()
return result.rows
def select_db(self, db):
"""Set current db"""
self._execute_command(COMMAND.COM_INIT_DB, db)
self._read_ok_packet()
def escape(self, obj, mapping=None):
"""Escape whatever value you pass to it.
Non-standard, for internal use; do not use this in your applications.
"""
if isinstance(obj, str_type):
return "'" + self.escape_string(obj) + "'"
return escape_item(obj, self.charset, mapping=mapping)
def literal(self, obj):
"""Alias for escape()
Non-standard, for internal use; do not use this in your applications.
"""
return self.escape(obj, self.encoders)
def escape_string(self, s):
if (self.server_status &
SERVER_STATUS.SERVER_STATUS_NO_BACKSLASH_ESCAPES):
return s.replace("'", "''")
return escape_string(s)
def cursor(self, cursor=None):
"""Create a new cursor to execute queries with"""
if cursor:
return cursor(self)
return self.cursorclass(self)
def __enter__(self):
"""Context manager that returns a Cursor"""
return self.cursor()
def __exit__(self, exc, value, traceback):
"""On successful exit, commit. On exception, rollback"""
if exc:
self.rollback()
else:
self.commit()
# The following methods are INTERNAL USE ONLY (called from Cursor)
def query(self, sql, unbuffered=False):
# if DEBUG:
# print("DEBUG: sending query:", sql)
if isinstance(sql, text_type) and not (JYTHON or IRONPYTHON):
if PY2:
sql = sql.encode(self.encoding)
else:
sql = sql.encode(self.encoding, 'surrogateescape')
self._execute_command(COMMAND.COM_QUERY, sql)
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
return self._affected_rows
def next_result(self, unbuffered=False):
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
return self._affected_rows
def affected_rows(self):
return self._affected_rows
def kill(self, thread_id):
arg = struct.pack('<I', thread_id)
self._execute_command(COMMAND.COM_PROCESS_KILL, arg)
return self._read_ok_packet()
def ping(self, reconnect=True):
"""Check if the server is alive"""
if self._sock is None:
if reconnect:
self.connect()
reconnect = False
else:
raise err.Error("Already closed")
try:
self._execute_command(COMMAND.COM_PING, "")
return self._read_ok_packet()
except Exception:
if reconnect:
self.connect()
return self.ping(False)
else:
raise
def set_charset(self, charset):
# Make sure charset is supported.
encoding = charset_by_name(charset).encoding
self._execute_command(COMMAND.COM_QUERY, "SET NAMES %s" % self.escape(charset))
self._read_packet()
self.charset = charset
self.encoding = encoding
def connect(self, sock=None):
self._closed = False
try:
if sock is None:
if self.unix_socket and self.host in ('localhost', '127.0.0.1'):
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.settimeout(self.connect_timeout)
sock.connect(self.unix_socket)
self.host_info = "Localhost via UNIX socket"
if DEBUG: print('connected using unix_socket')
else:
kwargs = {}
if self.bind_address is not None:
kwargs['source_address'] = (self.bind_address, 0)
while True:
try:
sock = socket.create_connection(
(self.host, self.port), self.connect_timeout,
**kwargs)
break
except (OSError, IOError) as e:
if e.errno == errno.EINTR:
continue
raise
self.host_info = "socket %s:%d" % (self.host, self.port)
if DEBUG: print('connected using socket')
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
sock.settimeout(None)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
self._sock = sock
self._rfile = _makefile(sock, 'rb')
self._next_seq_id = 0
self._get_server_information()
self._request_authentication()
if self.sql_mode is not None:
c = self.cursor()
c.execute("SET sql_mode=%s", (self.sql_mode,))
if self.init_command is not None:
c = self.cursor()
c.execute(self.init_command)
c.close()
self.commit()
if self.autocommit_mode is not None:
self.autocommit(self.autocommit_mode)
except BaseException as e:
self._rfile = None
if sock is not None:
try:
sock.close()
except:
pass
if isinstance(e, (OSError, IOError, socket.error)):
exc = err.OperationalError(
2003,
"Can't connect to MySQL server on %r (%s)" % (
self.host, e))
# Keep original exception and traceback to investigate error.
exc.original_exception = e
exc.traceback = traceback.format_exc()
if DEBUG: print(exc.traceback)
raise exc
# If e is neither DatabaseError or IOError, It's a bug.
# But raising AssertionError hides original error.
# So just reraise it.
raise
def write_packet(self, payload):
"""Writes an entire "mysql packet" in its entirety to the network
addings its length and sequence number.
"""
# Internal note: when you build packet manualy and calls _write_bytes()
# directly, you should set self._next_seq_id properly.
data = pack_int24(len(payload)) + int2byte(self._next_seq_id) + payload
if DEBUG: dump_packet(data)
self._write_bytes(data)
self._next_seq_id = (self._next_seq_id + 1) % 256
def _read_packet(self, packet_type=MysqlPacket):
"""Read an entire "mysql packet" in its entirety from the network
and return a MysqlPacket type that represents the results.
"""
buff = b''
while True:
packet_header = self._read_bytes(4)
if DEBUG: dump_packet(packet_header)
btrl, btrh, packet_number = struct.unpack('<HBB', packet_header)
bytes_to_read = btrl + (btrh << 16)
if packet_number != self._next_seq_id:
self._force_close()
if packet_number == 0:
# MariaDB sends error packet with seqno==0 when shutdown
raise err.OperationalError(
CR.CR_SERVER_LOST,
"Lost connection to MySQL server during query")
raise err.InternalError(
"Packet sequence number wrong - got %d expected %d"
% (packet_number, self._next_seq_id))
self._next_seq_id = (self._next_seq_id + 1) % 256
recv_data = self._read_bytes(bytes_to_read)
if DEBUG: dump_packet(recv_data)
buff += recv_data
# https://dev.mysql.com/doc/internals/en/sending-more-than-16mbyte.html
if bytes_to_read == 0xffffff:
continue
if bytes_to_read < MAX_PACKET_LEN:
break
packet = packet_type(buff, self.encoding)
packet.check_error()
return packet
def _read_bytes(self, num_bytes):
self._sock.settimeout(self._read_timeout)
while True:
try:
data = self._rfile.read(num_bytes)
break
except (IOError, OSError) as e:
if e.errno == errno.EINTR:
continue
self._force_close()
raise err.OperationalError(
CR.CR_SERVER_LOST,
"Lost connection to MySQL server during query (%s)" % (e,))
if len(data) < num_bytes:
self._force_close()
raise err.OperationalError(
CR.CR_SERVER_LOST, "Lost connection to MySQL server during query")
return data
def _write_bytes(self, data):
self._sock.settimeout(self._write_timeout)
try:
self._sock.sendall(data)
except IOError as e:
self._force_close()
raise err.OperationalError(
CR.CR_SERVER_GONE_ERROR,
"MySQL server has gone away (%r)" % (e,))
def _read_query_result(self, unbuffered=False):
if unbuffered:
try:
result = MySQLResult(self)
result.init_unbuffered_query()
except:
result.unbuffered_active = False
result.connection = None
raise
else:
result = MySQLResult(self)
result.read()
self._result = result
if result.server_status is not None:
self.server_status = result.server_status
return result.affected_rows
def insert_id(self):
if self._result:
return self._result.insert_id
else:
return 0
def _execute_command(self, command, sql):
if not self._sock:
raise err.InterfaceError("(0, '')")
# If the last query was unbuffered, make sure it finishes before
# sending new commands
if self._result is not None:
if self._result.unbuffered_active:
warnings.warn("Previous unbuffered result was left incomplete")
self._result._finish_unbuffered_query()
while self._result.has_next:
self.next_result()
self._result = None
if isinstance(sql, text_type):
sql = sql.encode(self.encoding)
packet_size = min(MAX_PACKET_LEN, len(sql) + 1) # +1 is for command
# tiny optimization: build first packet manually instead of
# calling self..write_packet()
prelude = struct.pack('<iB', packet_size, command)
packet = prelude + sql[:packet_size-1]
self._write_bytes(packet)
if DEBUG: dump_packet(packet)
self._next_seq_id = 1
if packet_size < MAX_PACKET_LEN:
return
sql = sql[packet_size-1:]
while True:
packet_size = min(MAX_PACKET_LEN, len(sql))
self.write_packet(sql[:packet_size])
sql = sql[packet_size:]
if not sql and packet_size < MAX_PACKET_LEN:
break
def _request_authentication(self):
# https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::HandshakeResponse
if int(self.server_version.split('.', 1)[0]) >= 5:
self.client_flag |= CLIENT.MULTI_RESULTS
if self.user is None:
raise ValueError("Did not specify a username")
charset_id = charset_by_name(self.charset).id
if isinstance(self.user, text_type):
self.user = self.user.encode(self.encoding)
data_init = struct.pack('<iIB23s', self.client_flag, 1, charset_id, b'')
if self.ssl and self.server_capabilities & CLIENT.SSL:
self.write_packet(data_init)
self._sock = self.ctx.wrap_socket(self._sock, server_hostname=self.host)
self._rfile = _makefile(self._sock, 'rb')
data = data_init + self.user + b' '
authresp = b''
if self._auth_plugin_name in ('', 'mysql_native_password'):
authresp = _scramble(self.password.encode('latin1'), self.salt)
if self.server_capabilities & CLIENT.PLUGIN_AUTH_LENENC_CLIENT_DATA:
data += lenenc_int(len(authresp)) + authresp
elif self.server_capabilities & CLIENT.SECURE_CONNECTION:
data += struct.pack('B', len(authresp)) + authresp
else: # pragma: no cover - not testing against servers without secure auth (>=5.0)
data += authresp + b' '
if self.db and self.server_capabilities & CLIENT.CONNECT_WITH_DB:
if isinstance(self.db, text_type):
self.db = self.db.encode(self.encoding)
data += self.db + b' '
if self.server_capabilities & CLIENT.PLUGIN_AUTH:
name = self._auth_plugin_name
if isinstance(name, text_type):
name = name.encode('ascii')
data += name + b' '
self.write_packet(data)
auth_packet = self._read_packet()
# if authentication method isn't accepted the first byte
# will have the octet 254
if auth_packet.is_auth_switch_request():
# https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::AuthSwitchRequest
auth_packet.read_uint8() # 0xfe packet identifier
plugin_name = auth_packet.read_string()
if self.server_capabilities & CLIENT.PLUGIN_AUTH and plugin_name is not None:
auth_packet = self._process_auth(plugin_name, auth_packet)
else:
# send legacy handshake
data = _scramble_323(self.password.encode('latin1'), self.salt) + b' '
self.write_packet(data)
auth_packet = self._read_packet()
def _process_auth(self, plugin_name, auth_packet):
plugin_class = self._auth_plugin_map.get(plugin_name)
if not plugin_class:
plugin_class = self._auth_plugin_map.get(plugin_name.decode('ascii'))
if plugin_class:
try:
handler = plugin_class(self)
return handler.authenticate(auth_packet)
except AttributeError:
if plugin_name != b'dialog':
raise err.OperationalError(2059, "Authentication plugin '%s'"
" not loaded: - %r missing authenticate method" % (plugin_name, plugin_class))
except TypeError:
raise err.OperationalError(2059, "Authentication plugin '%s'"
" not loaded: - %r cannot be constructed with connection object" % (plugin_name, plugin_class))
else:
handler = None
if plugin_name == b"mysql_native_password":
# https://dev.mysql.com/doc/internals/en/secure-password-authentication.html#packet-Authentication::Native41
data = _scramble(self.password.encode('latin1'), auth_packet.read_all())
elif plugin_name == b"mysql_old_password":
# https://dev.mysql.com/doc/internals/en/old-password-authentication.html
data = _scramble_323(self.password.encode('latin1'), auth_packet.read_all()) + b' '
elif plugin_name == b"mysql_clear_password":
# https://dev.mysql.com/doc/internals/en/clear-text-authentication.html
data = self.password.encode('latin1') + b' '
elif plugin_name == b"dialog":
pkt = auth_packet
while True:
flag = pkt.read_uint8()
echo = (flag & 0x06) == 0x02
last = (flag & 0x01) == 0x01
prompt = pkt.read_all()
if prompt == b"Password: ":
self.write_packet(self.password.encode('latin1') + b' ')
elif handler:
resp = 'no response - TypeError within plugin.prompt method'
try:
resp = handler.prompt(echo, prompt)
self.write_packet(resp + b' ')
except AttributeError:
raise err.OperationalError(2059, "Authentication plugin '%s'"
" not loaded: - %r missing prompt method" % (plugin_name, handler))
except TypeError:
raise err.OperationalError(2061, "Authentication plugin '%s'"
" %r didn't respond with string. Returned '%r' to prompt %r" % (plugin_name, handler, resp, prompt))
else:
raise err.OperationalError(2059, "Authentication plugin '%s' (%r) not configured" % (plugin_name, handler))
pkt = self._read_packet()
pkt.check_error()
if pkt.is_ok_packet() or last:
break
return pkt
else:
raise err.OperationalError(2059, "Authentication plugin '%s' not configured" % plugin_name)
self.write_packet(data)
pkt = self._read_packet()
pkt.check_error()
return pkt
# _mysql support
def thread_id(self):
return self.server_thread_id[0]
def character_set_name(self):
return self.charset
def get_host_info(self):
return self.host_info
def get_proto_info(self):
return self.protocol_version
def _get_server_information(self):
i = 0
packet = self._read_packet()
data = packet.get_all_data()
if DEBUG: dump_packet(data)
self.protocol_version = byte2int(data[i:i+1])
i += 1
server_end = data.find(b' ', i)
self.server_version = data[i:server_end].decode('latin1')
i = server_end + 1
self.server_thread_id = struct.unpack('<I', data[i:i+4])
i += 4
self.salt = data[i:i+8]
i += 9 # 8 + 1(filler)
self.server_capabilities = struct.unpack('<H', data[i:i+2])[0]
i += 2
if len(data) >= i + 6:
lang, stat, cap_h, salt_len = struct.unpack('<BHHB', data[i:i+6])
i += 6
# TODO: deprecate server_language and server_charset.
# mysqlclient-python doesn't provide it.
self.server_language = lang
try:
self.server_charset = charset_by_id(lang).name
except KeyError:
# unknown collation
self.server_charset = None
self.server_status = stat
if DEBUG: print("server_status: %x" % stat)
self.server_capabilities |= cap_h << 16
if DEBUG: print("salt_len:", salt_len)
salt_len = max(12, salt_len - 9)
# reserved
i += 10
if len(data) >= i + salt_len:
# salt_len includes auth_plugin_data_part_1 and filler
self.salt += data[i:i+salt_len]
i += salt_len
i+=1
# AUTH PLUGIN NAME may appear here.
if self.server_capabilities & CLIENT.PLUGIN_AUTH and len(data) >= i:
# Due to Bug#59453 the auth-plugin-name is missing the terminating
# NUL-char in versions prior to 5.5.10 and 5.6.2.
# ref: https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::Handshake
# didn't use version checks as mariadb is corrected and reports
# earlier than those two.
server_end = data.find(b' ', i)
if server_end < 0: # pragma: no cover - very specific upstream bug
# not found and last field so take it all
self._auth_plugin_name = data[i:].decode('latin1')
else:
self._auth_plugin_name = data[i:server_end].decode('latin1')
def get_server_info(self):
return self.server_version
Warning = err.Warning
Error = err.Error
InterfaceError = err.InterfaceError
DatabaseError = err.DatabaseError
DataError = err.DataError
OperationalError = err.OperationalError
IntegrityError = err.IntegrityError
InternalError = err.InternalError
ProgrammingError = err.ProgrammingError
NotSupportedError = err.NotSupportedError
class MySQLResult(object):
def __init__(self, connection):
"""
:type connection: Connection
"""
self.connection = connection
self.affected_rows = None
self.insert_id = None
self.server_status = None
self.warning_count = 0
self.message = None
self.field_count = 0
self.description = None
self.rows = None
self.has_next = None
self.unbuffered_active = False
def __del__(self):
if self.unbuffered_active:
self._finish_unbuffered_query()
def read(self):
try:
first_packet = self.connection._read_packet()
if first_packet.is_ok_packet():
self._read_ok_packet(first_packet)
elif first_packet.is_load_local_packet():
self._read_load_local_packet(first_packet)
else:
self._read_result_packet(first_packet)
finally:
self.connection = None
def init_unbuffered_query(self):
self.unbuffered_active = True
first_packet = self.connection._read_packet()
if first_packet.is_ok_packet():
self._read_ok_packet(first_packet)
self.unbuffered_active = False
self.connection = None
elif first_packet.is_load_local_packet():
self._read_load_local_packet(first_packet)
self.unbuffered_active = False
self.connection = None
else:
self.field_count = first_packet.read_length_encoded_integer()
self._get_descriptions()
# Apparently, MySQLdb picks this number because it's the maximum
# value of a 64bit unsigned integer. Since we're emulating MySQLdb,
# we set it to this instead of None, which would be preferred.
self.affected_rows = 18446744073709551615
def _read_ok_packet(self, first_packet):
ok_packet = OKPacketWrapper(first_packet)
self.affected_rows = ok_packet.affected_rows
self.insert_id = ok_packet.insert_id
self.server_status = ok_packet.server_status
self.warning_count = ok_packet.warning_count
self.message = ok_packet.message
self.has_next = ok_packet.has_next
def _read_load_local_packet(self, first_packet):
if not self.connection._local_infile:
raise RuntimeError(
"**WARN**: Received LOAD_LOCAL packet but local_infile option is false.")
load_packet = LoadLocalPacketWrapper(first_packet)
sender = LoadLocalFile(load_packet.filename, self.connection)
try:
sender.send_data()
except:
self.connection._read_packet() # skip ok packet
raise
ok_packet = self.connection._read_packet()
if not ok_packet.is_ok_packet(): # pragma: no cover - upstream induced protocol error
raise err.OperationalError(2014, "Commands Out of Sync")
self._read_ok_packet(ok_packet)
def _check_packet_is_eof(self, packet):
if not packet.is_eof_packet():
return False
#TODO: Support CLIENT.DEPRECATE_EOF
# 1) Add DEPRECATE_EOF to CAPABILITIES
# 2) Mask CAPABILITIES with server_capabilities
# 3) if server_capabilities & CLIENT.DEPRECATE_EOF: use OKPacketWrapper instead of EOFPacketWrapper
wp = EOFPacketWrapper(packet)
self.warning_count = wp.warning_count
self.has_next = wp.has_next
return True
def _read_result_packet(self, first_packet):
self.field_count = first_packet.read_length_encoded_integer()
self._get_descriptions()
self._read_rowdata_packet()
def _read_rowdata_packet_unbuffered(self):
# Check if in an active query
if not self.unbuffered_active:
return
# EOF
packet = self.connection._read_packet()
if self._check_packet_is_eof(packet):
self.unbuffered_active = False
self.connection = None
self.rows = None
return
row = self._read_row_from_packet(packet)
self.affected_rows = 1
self.rows = (row,) # rows should tuple of row for MySQL-python compatibility.
return row
def _finish_unbuffered_query(self):
# After much reading on the MySQL protocol, it appears that there is,
# in fact, no way to stop MySQL from sending all the data after
# executing a query, so we just spin, and wait for an EOF packet.
while self.unbuffered_active:
packet = self.connection._read_packet()
if self._check_packet_is_eof(packet):
self.unbuffered_active = False
self.connection = None # release reference to kill cyclic reference.
def _read_rowdata_packet(self):
"""Read a rowdata packet for each data row in the result set."""
rows = []
while True:
packet = self.connection._read_packet()
if self._check_packet_is_eof(packet):
self.connection = None # release reference to kill cyclic reference.
break
rows.append(self._read_row_from_packet(packet))
self.affected_rows = len(rows)
self.rows = tuple(rows)
def _read_row_from_packet(self, packet):
row = []
for encoding, converter in self.converters:
try:
data = packet.read_length_coded_string()
except IndexError:
# No more columns in this row
# See https://github.com/PyMySQL/PyMySQL/pull/434
break
if data is not None:
if encoding is not None:
data = data.decode(encoding)
if DEBUG: print("DEBUG: DATA = ", data)
if converter is not None:
data = converter(data)
row.append(data)
return tuple(row)
def _get_descriptions(self):
"""Read a column descriptor packet for each column in the result."""
self.fields = []
self.converters = []
use_unicode = self.connection.use_unicode
conn_encoding = self.connection.encoding
description = []
for i in range_type(self.field_count):
field = self.connection._read_packet(FieldDescriptorPacket)
self.fields.append(field)
description.append(field.description())
field_type = field.type_code
if use_unicode:
if field_type == FIELD_TYPE.JSON:
# When SELECT from JSON column: charset = binary
# When SELECT CAST(... AS JSON): charset = connection encoding
# This behavior is different from TEXT / BLOB.
# We should decode result by connection encoding regardless charsetnr.
# See https://github.com/PyMySQL/PyMySQL/issues/488
encoding = conn_encoding # SELECT CAST(... AS JSON)
elif field_type in TEXT_TYPES:
if field.charsetnr == 63: # binary
# TEXTs with charset=binary means BINARY types.
encoding = None
else:
encoding = conn_encoding
else:
# Integers, Dates and Times, and other basic data is encoded in ascii
encoding = 'ascii'
else:
encoding = None
converter = self.connection.decoders.get(field_type)
if converter is through:
converter = None
if DEBUG: print("DEBUG: field={}, converter={}".format(field, converter))
self.converters.append((encoding, converter))
eof_packet = self.connection._read_packet()
assert eof_packet.is_eof_packet(), 'Protocol error, expecting EOF'
self.description = tuple(description)
class LoadLocalFile(object):
def __init__(self, filename, connection):
self.filename = filename
self.connection = connection
def send_data(self):
"""Send data packets from the local file to the server"""
if not self.connection._sock:
raise err.InterfaceError("(0, '')")
conn = self.connection
try:
with open(self.filename, 'rb') as open_file:
packet_size = min(conn.max_allowed_packet, 16*1024) # 16KB is efficient enough
while True:
chunk = open_file.read(packet_size)
if not chunk:
break
conn.write_packet(chunk)
except IOError:
raise err.OperationalError(1017, "Can't find file '{0}'".format(self.filename))
finally:
# send the empty packet to signify we are done sending data
conn.write_packet(b'')
