/usr/lib/python2.7/dist-packages/mysql/utilities/command/failover_console.py is in mysql-utilities 1.6.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2010, 2013 Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
"""
This file contains the automatic failover console. It contains only the
user interface code for the automatic failover feature for replication.
"""
import logging
import os
import sys
import time
import struct
from mysql.utilities.exception import UtilRplError
from mysql.utilities.common.format import format_tabular_list, print_list
_CONSOLE_HEADER = "MySQL Replication Failover Utility"
_CONSOLE_FOOTER = "Q-quit R-refresh H-health G-GTID Lists U-UUIDs"
_CONSOLE_FOOTER_NO_KEYBOARD = "Press CTRL+C to quit"
_COMMAND_KEYS = {'\x1b[A': 'ARROW_UP', '\x1b[B': 'ARROW_DN'}
# Minimum number of rows needed to display screen
_MINIMUM_ROWS = 15
_HEALTH_LIST = "Replication Health Status"
_MASTER_GTID_LIST = "Master GTID Executed Set"
_MASTER_GTID_COLS = ['gtid']
_GTID_LISTS = ["Transactions executed on the servers:",
"Transactions purged from the servers:",
"Transactions owned by another server:"]
_UUID_LIST = "UUIDs"
_LOG_LIST = "Log File"
_GEN_UUID_COLS = ['host', 'port', 'role', 'uuid']
_GEN_GTID_COLS = ['host', 'port', 'role', 'gtid']
_DATE_LEN = 22
_DROP_FC_TABLE = "DROP TABLE IF EXISTS mysql.failover_console"
_CREATE_FC_TABLE = ("CREATE TABLE IF NOT EXISTS mysql.failover_console "
"(host char(30), port char(10))")
_SELECT_FC_TABLE = ("SELECT * FROM mysql.failover_console WHERE host = '%s' "
"AND port = '%s'")
_INSERT_FC_TABLE = "INSERT INTO mysql.failover_console VALUES ('%s', '%s')"
_DELETE_FC_TABLE = ("DELETE FROM mysql.failover_console WHERE host = '%s' "
"AND port = '%s'")
# Idle time (in seconds) for polling user input to avoid high CPU usage.
_IDLE_TIME_INPUT_POLLING = 0.01 # 10 ms
# Try to import the windows getch() if it fails, we're on Posix so define
# a custom getch() method to return keys.
try:
# Win32
from msvcrt import getch, kbhit # pylint: disable=F0401
except ImportError:
# UNIX/Posix
import termios
from select import select
def getch():
"""Make a get character keyboard method for Posix machines.
"""
fd = sys.stdin.fileno()
old = termios.tcgetattr(fd)
new = termios.tcgetattr(fd)
new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
new[6][termios.VMIN] = 1
new[6][termios.VTIME] = 0
termios.tcsetattr(fd, termios.TCSANOW, new)
key = None
try:
key = os.read(fd, 4)
finally:
termios.tcsetattr(fd, termios.TCSAFLUSH, old)
return key
def kbhit():
"""Make a keyboard hit method for Posix machines.
"""
# Use a timeout != 0 to avoid 100% CPU usage for polling user input.
return select([sys.stdin], [], [],
_IDLE_TIME_INPUT_POLLING) == ([sys.stdin], [], [])
def get_terminal_size():
"""Return the size in columns, rows for terminal window
This method will attempt to determine the current terminal window size.
If it cannot, it returns the default of (80, 25) = 80 characters
on a line and 25 lines.
Returns tuple - (x, y) = max colum (# chars), max rows
"""
default = (80, 25)
try:
if os.name == "posix":
import fcntl
import termios
y, x = 0, 1
packed_info = fcntl.ioctl(0, termios.TIOCGWINSZ,
struct.pack('HHHH', 0, 0, 0, 0))
wininfo = struct.unpack('HHHH', packed_info)
return (wininfo[x], wininfo[y])
else:
from ctypes import windll, create_string_buffer
# -11 == stdout
handle = windll.kernel32.GetStdHandle(-11)
strbuff = create_string_buffer(22)
windll.kernel32.GetConsoleScreenBufferInfo(handle, strbuff)
left, top, right, bottom = 5, 6, 7, 8
wininfo = struct.unpack("hhhhHhhhhhh", strbuff)
x = wininfo[right] - wininfo[left] + 1
y = wininfo[bottom] - wininfo[top] + 1
return (x, y)
except:
pass # silence! just return default on error.
return default
class FailoverConsole(object):
"""Automatic Failover Console
This class implements a basic, text screen console for displaying
information about the master and the replication health for the
topology. The interface supports these commands:
- H = show replication health
- G = toggle through GTID lists (GTID_EXECUTED, GTID_PURGED, GTID_OWNED)
- U = show UUIDs of servers
- R = refresh screen
- L = (iff --log specified) show log contents
- Q = quit the console
"""
def __init__(self, master, get_health_data,
get_gtid_data, get_uuid_data, options):
"""Constructor
The constructor requires the caller to specify a master of the
Master class instance, and method pointers for getting health,
gtid, and uuid information. An options dictionary is used to define
overal behavior of the class methods.
master[in] a Master class instance
get_health_data[in] method pointer to heatlh data method
get_gtid_data[in] method pointer to gtid data method
get_uuid_data[in] method pointer to uuid data method
options[in] option dictionary to include
interval time in seconds for interval loop, default = 15
failover_mode failover mode (used for reporting only),
default = 'auto'
"""
self.interval = int(options.get("interval", 15))
self.pingtime = options.get("pingtime", 3)
self.mode = options.get("failover_mode", "auto")
self.logging = options.get("logging", False)
self.log_file = options.get("log_file", None)
# If the option --no-keyboard is provided, the menu will be disabled
# and any keyboard request will be ignored.
self.no_keyboard = options.get("no_keyboard", False)
self.alarm = time.time() + self.interval
self.gtid_list = -1
self.scroll_size = 0
self.start_list = 0
self.end_list = 0
self.stop_list = 0
self.rows_printed = 0
self.max_cols = 80
self.max_rows = 24
self.list_data = None
self.comment = _HEALTH_LIST
self.scroll_on = False
self.old_mode = None
self.master_gtids = []
# Dictionary that holds the current warning messages
self.warnings_dic = {}
# Callback methods for reading data
self.master = master
self.get_health_data = get_health_data
self.get_gtid_data = get_gtid_data
self.get_uuid_data = get_uuid_data
self.report_mode = 'H'
self._reset_screen_size()
def register_instance(self, clear=False, register=True):
"""Register the console as running on the master.
This method will attempt to register the console as running against
the master for failover modes auto or elect. If another console is
already registered, this instance becomes blocked resulting in the
mode change to 'fail' and failover will not occur when this instance
of the console detects failover.
clear[in] if True, clear the sentinel database entries on the
master. Default is False.
register[in] if True, register the console on the master. If False,
unregister the console on the master. Default is True.
Returns string - new mode if changed
"""
# We cannot check disconnected masters and do not need to check if
# we are doing a simple fail mode.
if self.master is None or self.mode == 'fail':
return self.mode
# Turn binary log off first
self.master.toggle_binlog("DISABLE")
host_port = (self.master.host, self.master.port)
# Drop the table if specified
if clear:
self.master.exec_query(_DROP_FC_TABLE)
# Register the console
if register:
res = self.master.exec_query(_CREATE_FC_TABLE)
res = self.master.exec_query(_SELECT_FC_TABLE % host_port)
# COMMIT to close session before enabling binlog.
self.master.commit()
if res != []:
# Someone beat us there. Drat.
self.old_mode = self.mode
self.mode = 'fail'
else:
# We're first! Yippee.
res = self.master.exec_query(_INSERT_FC_TABLE % host_port)
# Unregister the console if our mode was changed
elif self.old_mode != self.mode:
res = self.master.exec_query(_DELETE_FC_TABLE % host_port)
# Turn binary log on
self.master.toggle_binlog("ENABLE")
return self.mode
def unregister_slaves(self, topology):
"""Unregister the daemon as running on the slaves.
This method will unregister the daemon that was previously registered
on the slaves, for failover modes auto or elect.
"""
if self.master is None or self.mode == 'fail':
return
for slave_dict in topology.slaves:
slave_instance = slave_dict["instance"]
# Skip unreachable/not connected slaves.
if slave_instance and slave_instance.is_alive():
# Turn binary log off first
slave_instance.toggle_binlog("DISABLE")
# Drop failover instance registration table.
slave_instance.exec_query(_DROP_FC_TABLE)
# Turn binary log on
slave_instance.toggle_binlog("ENABLE")
def _reset_interval(self, interval=15):
"""Reset the interval timing
"""
self.interval = interval
self.alarm = self.interval + time.time()
def _reset_screen_size(self):
"""Recalculate the screen size
"""
self.max_cols, self.max_rows = get_terminal_size()
if self.max_rows < _MINIMUM_ROWS:
self.max_rows = _MINIMUM_ROWS
def _format_gtid_data(self):
"""Get the formatted GTID data
This method sets the member list_data to the GTID list to populate
the list. A subsequent call to _print_list() displays the new
list.
"""
rows = []
# Get GTID lists
self.gtid_list += 1
if self.gtid_list > 3:
self.gtid_list = 0
if self.gtid_list == 0 and self.master_gtids:
self.comment = _MASTER_GTID_LIST
rows = self.master_gtids
elif self.get_gtid_data:
try:
gtid_data = self.get_gtid_data()
except Exception as err:
raise UtilRplError("Cannot get GTID data: {0}".format(err))
self.comment = _GTID_LISTS[self.gtid_list - 1]
rows = gtid_data[self.gtid_list - 1]
self.start_list = 0
self.end_list = len(rows)
self.report_mode = 'G'
if self.gtid_list == 0:
return (_MASTER_GTID_COLS, rows)
else:
return (_GEN_GTID_COLS, rows)
def _format_health_data(self):
"""Get the formatted health data
This method sets the member list_data to the health list to populate
the list. A subsequent call to _print_list() displays the new
list.
"""
# Get health information
if self.get_health_data is not None:
try:
health_data = self.get_health_data()
except Exception as err:
raise UtilRplError("Cannot get health data: {0}".format(err))
self.start_list = 0
self.end_list = len(health_data[1])
self.report_mode = 'H'
return health_data
return ([], [])
def _format_uuid_data(self):
"""Get the formatted UUID data
This method sets the member list_data to the UUID list to populate
the list. A subsequent call to _print_list() displays the new
list.
"""
rows = []
# Get UUID information
if self.get_uuid_data is not None:
self.comment = _UUID_LIST
try:
rows = self.get_uuid_data()
except Exception as err:
raise UtilRplError("Cannot get UUID data: {0}".format(err))
self.start_list = 0
self.end_list = len(rows)
self.report_mode = 'U'
return (_GEN_UUID_COLS, rows)
def _format_log_entries(self):
"""Get the log data if logging is on
This method sets the member list_data to the log entries to populate
the list if logging is enables. A subsequent call to _print_list()
displays the new list.
"""
rows = []
cols = ["Date", "Entry"]
if self.logging and self.log_file is not None:
self.comment = _LOG_LIST
log = open(self.log_file, "r")
for row in log.readlines():
rows.append(
(row[0:_DATE_LEN], row[_DATE_LEN + 1:].strip('\n')))
log.close()
self.start_list = 0
self.end_list = len(rows)
self.report_mode = 'L'
return(cols, rows)
def _do_command(self, key):
"""Execute the user command representing the key pressed
This method executes the command based on the key pressed. Commands
recognized include show health, toggle through GTID lists, show
UUIDs, and scroll list UP/DOWN.
The method also checks for resize of the terminal window for nicer,
automatic list resize.
key[in] key pressed by user
Note: Invalid keys are ignored.
"""
# We check for screen resize here
self.max_cols, self.max_rows = get_terminal_size()
# Reset the GTID list counter
if key not in ['g', 'G']:
self.gtid_list = -1
# Refresh
if key in ['r', 'R']:
self._refresh()
# Show GTIDs
elif key in ['g', 'G']:
self.list_data = self._format_gtid_data()
self._print_list()
# Show health report
elif key in ['h', 'H']:
self.list_data = self._format_health_data()
self._print_list()
elif key in ['u', 'U']:
self.list_data = self._format_uuid_data()
self._print_list()
elif key in ['l', 'L']:
if self.logging:
self.list_data = self._format_log_entries()
self._print_list()
elif key in _COMMAND_KEYS:
self._scroll(key)
def _wait_for_interval(self):
"""Wait for the time interval to expire
This method issues a timing loop to wait for the specified interval to
expire or quit if the user presses 'q' or 'Q'. The method passes all
other keyboard requests to the _do_command() method for processing.
If the interval expires, the method returns None.
If the user presses a key, the method returns the numeric key number.
Returns - None or int (see above)
"""
# If on *nix systems, set the terminal IO sys to not echo
if not self.no_keyboard and os.name == "posix":
import tty
import termios
old_settings = termios.tcgetattr(sys.stdin)
tty.setcbreak(sys.stdin.fileno())
key = None
done = False
try:
# Loop for interval in seconds while detecting keypress
while not done:
done = self.alarm <= time.time()
if not self.no_keyboard and kbhit() and not done:
key = getch()
done = True
if os.name != "posix":
# On Windows wait a few ms to avoid 100% CPU usage for
# polling input (handled in kbhit() for posix systems).
time.sleep(_IDLE_TIME_INPUT_POLLING)
finally:
# Ensure terminal IO sys is reset to older state.
if not self.no_keyboard and os.name == "posix":
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)
return key
def clear(self):
"""Clear the screen
This method uses a platform specific terminal screen clear to simulate
a clear of the console.
"""
if os.name == "posix":
os.system("clear")
else:
os.system("cls")
self.rows_printed = 0
def _print_header(self):
"""Display header
"""
print _CONSOLE_HEADER
next_interval = time.ctime(self.alarm)
print "Failover Mode =", self.mode, " Next Interval =", \
next_interval
if self.old_mode is not None and self.old_mode != self.mode:
print
print "NOTICE: Failover mode changed to fail due to another"
print " instance of the console running against master."
self.rows_printed += 2
self.max_rows -= 3
print
self.rows_printed += 4
def _print_master_status(self):
"""Display the master information
This method displays the master information from SHOW MASTER STATUS.
"""
# If no master present, don't print anything.
if self.master is None:
return
try:
status = self.master.get_status()[0]
if self.logging:
logging.info("Master status: binlog: {0}, position:{1}"
"".format(status[0], status[1]))
except Exception as err:
raise UtilRplError("Cannot get master status: {0}".format(err))
print "Master Information"
print "------------------"
cols = ("Binary Log File", "Position",
"Binlog_Do_DB", "Binlog_Ignore_DB")
fmt_opts = {
"print_header": True,
"separator": None,
"quiet": True,
"print_footer": False,
}
logfile = status[0][0:20] if len(status[0]) > 20 else status[0]
rows = [(logfile, status[1], status[2], status[3])]
format_tabular_list(sys.stdout, cols, rows, fmt_opts)
# Display gtid executed set
self.master_gtids = []
for gtid in status[4].split("\n"):
if len(gtid):
# Add each GTID to a tuple to match the required format to
# print the full GRID list correctly.
self.master_gtids.append((gtid.strip(","),))
print "\nGTID Executed Set"
try:
print self.master_gtids[0][0],
except IndexError:
print "None",
if len(self.master_gtids) > 1:
print "[...]"
else:
print
print
self.rows_printed += 7
def _print_warnings(self):
"""Print current warning messages
This method displays current warning messages if they exist.
"""
# Only do something if warnings exist.
if self.warnings_dic:
for msg in self.warnings_dic.itervalues():
print("WARNING: {0}".format(msg))
self.rows_printed += 1
def add_warning(self, warning_key, warning_msg):
"""Add a warning message to the current dictionary of warnings.
warning_key[in] key associated with the warning message to add.
warning_msg[in] warning message to add to the current dictionary of
warnings.
"""
self.warnings_dic[warning_key] = warning_msg
def del_warning(self, warning_key):
"""Remove a warning message from the current dictionary of warnings.
warning_key[in] key associated with the warning message to remove.
"""
if warning_key in self.warnings_dic:
del self.warnings_dic[warning_key]
def _scroll(self, key):
"""Scroll the list view
This method recalculates the start_list and end_list member variables
depending on the key pressed. UP moves the list up (lower row indexes)
and DOWN moves the list down (higher row indexes). It calls
_print_list() at the end to redraw the screen.
key[in] key pressed by user
Note: Invalid keys are ignored.
"""
if _COMMAND_KEYS[key] == 'ARROW_UP':
if self.start_list > 0:
self.start_list -= self.scroll_size
if self.start_list < 0:
self.start_list = 0
self.stop_list = self.scroll_size
else:
return # Cannot scroll up any further
elif _COMMAND_KEYS[key] == 'ARROW_DN':
if self.end_list < len(self.list_data[1]):
self.start_list = self.end_list
self.end_list += self.scroll_size
if self.end_list > len(self.list_data[1]):
self.end_list = len(self.list_data[1])
else:
return # Cannot scroll down any further
else:
return # Not a valid scroll key
self._print_list(True)
def _print_list(self, refresh=True, comment=None):
"""Display the list information
This method displays the list information using the start_list and
end_list member variables to control the view of the data. This
permits users to scroll through the data should it be longer than
the space permitted on the screen.
"""
# If no data to print, exit
if self.list_data is None:
return
if refresh:
self.clear()
self._print_header()
self._print_master_status()
# Print list name
if comment is None:
comment = self.comment
print comment
self.rows_printed += 1
# Print the list in the remaining space
footer_len = 2
remaining_rows = self.max_rows - self.rows_printed - 4 - footer_len
if len(self.list_data[1][self.start_list:self.end_list]) > \
remaining_rows:
rows = self.list_data[1][self.start_list:self.start_list +
remaining_rows]
self.end_list = self.start_list + remaining_rows
self.scroll_on = True
else:
if len(self.list_data[1]) == self.end_list and \
self.start_list == 0:
self.scroll_on = False
rows = self.list_data[1][self.start_list:self.end_list]
if len(rows) > 0:
self.scroll_size = len(rows)
print_list(sys.stdout, 'GRID', self.list_data[0], rows)
self.rows_printed += self.scroll_size + 4
else:
print "0 Rows Found."
self.rows_printed += 1
if refresh:
self._print_footer(self.scroll_on)
def _print_footer(self, scroll=False):
"""Print the footer
This method prints the footer for the console consisting of the
user commands permitted.
scroll[in] if True, display scroll commands
"""
# Print blank lines fill screen
i = self.rows_printed
while i < self.max_rows - 2:
print
i += 1
# Show bottom menu options
footer = []
if self.no_keyboard:
# No support for keyboard, disable menu
footer.append(_CONSOLE_FOOTER_NO_KEYBOARD)
else:
footer.append(_CONSOLE_FOOTER)
# If logging enabled, show command
if self.logging:
footer.append("L-log entries")
if scroll:
footer.append("Up|Down-scroll")
print(" ".join(footer))
self.rows_printed = self.max_rows
def _refresh(self):
"""Refresh the console
This method redraws the console resetting screen size if the
command/terminal window was resized since last action.
"""
self.clear()
self._reset_screen_size()
self._print_header()
self._print_master_status()
self._print_warnings()
# refresh health if already displayed
if self.report_mode == 'H':
self.list_data = self._format_health_data()
self._print_list(False)
self._print_footer(self.scroll_on)
def _reconnect_master(self, pingtime=3):
"""Tries to reconnect to the master
This method tries to reconnect to the master and if connection fails
after 3 attemps, returns False.
"""
if self.master and self.master.is_alive():
return True
is_connected = False
i = 0
while i < 3:
try:
self.master.connect()
is_connected = True
break
except:
pass
time.sleep(pingtime)
i += 1
return is_connected
def display_console(self):
"""Display the failover console
This method presents the information for the failover console. Since
there is no UI module in use, it clears the screen and redraws the
data again.
It uses the method specified in the constructor for getting and
refreshing the data.
Returns bool - True = user exit no errors, False = errors
"""
self._reset_interval(self.interval)
# Get the data for first printing of the screen
if self.list_data is None:
self.list_data = self.get_health_data()
self.start_list = 0
self.end_list = len(self.list_data[1])
self.gtid_list = -1 # Reset the GTID list counter
# Draw the screen
self._refresh()
# Wait for a key press or the interval to expire
done = False
while not done:
# Disconnect the master while waiting for the interval to expire
self.master.disconnect()
# Wait for the interval to expire
key = self._wait_for_interval()
# Reconnect to the master
self._reconnect_master(self.pingtime)
if key is None:
return None
if key in ['Q', 'q']:
return True
else:
# Refresh health on interval
if self.report_mode == 'H':
self.list_data = self._format_health_data()
self._print_list()
self._do_command(key)
return False
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