charm-plumgrid-gateway/hooks/charmhelpers/contrib/database/mysql.py

413 lines
15 KiB
Python

"""Helper for working with a MySQL database"""
import json
import re
import sys
import platform
import os
import glob
# from string import upper
from charmhelpers.core.host import (
mkdir,
pwgen,
write_file
)
from charmhelpers.core.hookenv import (
config as config_get,
relation_get,
related_units,
unit_get,
log,
DEBUG,
INFO,
WARNING,
)
from charmhelpers.fetch import (
apt_install,
apt_update,
filter_installed_packages,
)
from charmhelpers.contrib.peerstorage import (
peer_store,
peer_retrieve,
)
from charmhelpers.contrib.network.ip import get_host_ip
try:
import MySQLdb
except ImportError:
apt_update(fatal=True)
apt_install(filter_installed_packages(['python-mysqldb']), fatal=True)
import MySQLdb
class MySQLHelper(object):
def __init__(self, rpasswdf_template, upasswdf_template, host='localhost',
migrate_passwd_to_peer_relation=True,
delete_ondisk_passwd_file=True):
self.host = host
# Password file path templates
self.root_passwd_file_template = rpasswdf_template
self.user_passwd_file_template = upasswdf_template
self.migrate_passwd_to_peer_relation = migrate_passwd_to_peer_relation
# If we migrate we have the option to delete local copy of root passwd
self.delete_ondisk_passwd_file = delete_ondisk_passwd_file
def connect(self, user='root', password=None):
log("Opening db connection for %s@%s" % (user, self.host), level=DEBUG)
self.connection = MySQLdb.connect(user=user, host=self.host,
passwd=password)
def database_exists(self, db_name):
cursor = self.connection.cursor()
try:
cursor.execute("SHOW DATABASES")
databases = [i[0] for i in cursor.fetchall()]
finally:
cursor.close()
return db_name in databases
def create_database(self, db_name):
cursor = self.connection.cursor()
try:
cursor.execute("CREATE DATABASE {} CHARACTER SET UTF8"
.format(db_name))
finally:
cursor.close()
def grant_exists(self, db_name, db_user, remote_ip):
cursor = self.connection.cursor()
priv_string = "GRANT ALL PRIVILEGES ON `{}`.* " \
"TO '{}'@'{}'".format(db_name, db_user, remote_ip)
try:
cursor.execute("SHOW GRANTS for '{}'@'{}'".format(db_user,
remote_ip))
grants = [i[0] for i in cursor.fetchall()]
except MySQLdb.OperationalError:
return False
finally:
cursor.close()
# TODO: review for different grants
return priv_string in grants
def create_grant(self, db_name, db_user, remote_ip, password):
cursor = self.connection.cursor()
try:
# TODO: review for different grants
cursor.execute("GRANT ALL PRIVILEGES ON {}.* TO '{}'@'{}' "
"IDENTIFIED BY '{}'".format(db_name,
db_user,
remote_ip,
password))
finally:
cursor.close()
def create_admin_grant(self, db_user, remote_ip, password):
cursor = self.connection.cursor()
try:
cursor.execute("GRANT ALL PRIVILEGES ON *.* TO '{}'@'{}' "
"IDENTIFIED BY '{}'".format(db_user,
remote_ip,
password))
finally:
cursor.close()
def cleanup_grant(self, db_user, remote_ip):
cursor = self.connection.cursor()
try:
cursor.execute("DROP FROM mysql.user WHERE user='{}' "
"AND HOST='{}'".format(db_user,
remote_ip))
finally:
cursor.close()
def execute(self, sql):
"""Execute arbitary SQL against the database."""
cursor = self.connection.cursor()
try:
cursor.execute(sql)
finally:
cursor.close()
def migrate_passwords_to_peer_relation(self, excludes=None):
"""Migrate any passwords storage on disk to cluster peer relation."""
dirname = os.path.dirname(self.root_passwd_file_template)
path = os.path.join(dirname, '*.passwd')
for f in glob.glob(path):
if excludes and f in excludes:
log("Excluding %s from peer migration" % (f), level=DEBUG)
continue
key = os.path.basename(f)
with open(f, 'r') as passwd:
_value = passwd.read().strip()
try:
peer_store(key, _value)
if self.delete_ondisk_passwd_file:
os.unlink(f)
except ValueError:
# NOTE cluster relation not yet ready - skip for now
pass
def get_mysql_password_on_disk(self, username=None, password=None):
"""Retrieve, generate or store a mysql password for the provided
username on disk."""
if username:
template = self.user_passwd_file_template
passwd_file = template.format(username)
else:
passwd_file = self.root_passwd_file_template
_password = None
if os.path.exists(passwd_file):
log("Using existing password file '%s'" % passwd_file, level=DEBUG)
with open(passwd_file, 'r') as passwd:
_password = passwd.read().strip()
else:
log("Generating new password file '%s'" % passwd_file, level=DEBUG)
if not os.path.isdir(os.path.dirname(passwd_file)):
# NOTE: need to ensure this is not mysql root dir (which needs
# to be mysql readable)
mkdir(os.path.dirname(passwd_file), owner='root', group='root',
perms=0o770)
# Force permissions - for some reason the chmod in makedirs
# fails
os.chmod(os.path.dirname(passwd_file), 0o770)
_password = password or pwgen(length=32)
write_file(passwd_file, _password, owner='root', group='root',
perms=0o660)
return _password
def passwd_keys(self, username):
"""Generator to return keys used to store passwords in peer store.
NOTE: we support both legacy and new format to support mysql
charm prior to refactor. This is necessary to avoid LP 1451890.
"""
keys = []
if username == 'mysql':
log("Bad username '%s'" % (username), level=WARNING)
if username:
# IMPORTANT: *newer* format must be returned first
keys.append('mysql-%s.passwd' % (username))
keys.append('%s.passwd' % (username))
else:
keys.append('mysql.passwd')
for key in keys:
yield key
def get_mysql_password(self, username=None, password=None):
"""Retrieve, generate or store a mysql password for the provided
username using peer relation cluster."""
excludes = []
# First check peer relation.
try:
for key in self.passwd_keys(username):
_password = peer_retrieve(key)
if _password:
break
# If root password available don't update peer relation from local
if _password and not username:
excludes.append(self.root_passwd_file_template)
except ValueError:
# cluster relation is not yet started; use on-disk
_password = None
# If none available, generate new one
if not _password:
_password = self.get_mysql_password_on_disk(username, password)
# Put on wire if required
if self.migrate_passwd_to_peer_relation:
self.migrate_passwords_to_peer_relation(excludes=excludes)
return _password
def get_mysql_root_password(self, password=None):
"""Retrieve or generate mysql root password for service units."""
return self.get_mysql_password(username=None, password=password)
def normalize_address(self, hostname):
"""Ensure that address returned is an IP address (i.e. not fqdn)"""
if config_get('prefer-ipv6'):
# TODO: add support for ipv6 dns
return hostname
if hostname != unit_get('private-address'):
return get_host_ip(hostname, fallback=hostname)
# Otherwise assume localhost
return '127.0.0.1'
def get_allowed_units(self, database, username, relation_id=None):
"""Get list of units with access grants for database with username.
This is typically used to provide shared-db relations with a list of
which units have been granted access to the given database.
"""
self.connect(password=self.get_mysql_root_password())
allowed_units = set()
for unit in related_units(relation_id):
settings = relation_get(rid=relation_id, unit=unit)
# First check for setting with prefix, then without
for attr in ["%s_hostname" % (database), 'hostname']:
hosts = settings.get(attr, None)
if hosts:
break
if hosts:
# hostname can be json-encoded list of hostnames
try:
hosts = json.loads(hosts)
except ValueError:
hosts = [hosts]
else:
hosts = [settings['private-address']]
if hosts:
for host in hosts:
host = self.normalize_address(host)
if self.grant_exists(database, username, host):
log("Grant exists for host '%s' on db '%s'" %
(host, database), level=DEBUG)
if unit not in allowed_units:
allowed_units.add(unit)
else:
log("Grant does NOT exist for host '%s' on db '%s'" %
(host, database), level=DEBUG)
else:
log("No hosts found for grant check", level=INFO)
return allowed_units
def configure_db(self, hostname, database, username, admin=False):
"""Configure access to database for username from hostname."""
self.connect(password=self.get_mysql_root_password())
if not self.database_exists(database):
self.create_database(database)
remote_ip = self.normalize_address(hostname)
password = self.get_mysql_password(username)
if not self.grant_exists(database, username, remote_ip):
if not admin:
self.create_grant(database, username, remote_ip, password)
else:
self.create_admin_grant(username, remote_ip, password)
return password
class PerconaClusterHelper(object):
# Going for the biggest page size to avoid wasted bytes.
# InnoDB page size is 16MB
DEFAULT_PAGE_SIZE = 16 * 1024 * 1024
DEFAULT_INNODB_BUFFER_FACTOR = 0.50
def human_to_bytes(self, human):
"""Convert human readable configuration options to bytes."""
num_re = re.compile('^[0-9]+$')
if num_re.match(human):
return human
factors = {
'K': 1024,
'M': 1048576,
'G': 1073741824,
'T': 1099511627776
}
modifier = human[-1]
if modifier in factors:
return int(human[:-1]) * factors[modifier]
if modifier == '%':
total_ram = self.human_to_bytes(self.get_mem_total())
if self.is_32bit_system() and total_ram > self.sys_mem_limit():
total_ram = self.sys_mem_limit()
factor = int(human[:-1]) * 0.01
pctram = total_ram * factor
return int(pctram - (pctram % self.DEFAULT_PAGE_SIZE))
raise ValueError("Can only convert K,M,G, or T")
def is_32bit_system(self):
"""Determine whether system is 32 or 64 bit."""
try:
return sys.maxsize < 2 ** 32
except OverflowError:
return False
def sys_mem_limit(self):
"""Determine the default memory limit for the current service unit."""
if platform.machine() in ['armv7l']:
_mem_limit = self.human_to_bytes('2700M') # experimentally determined
else:
# Limit for x86 based 32bit systems
_mem_limit = self.human_to_bytes('4G')
return _mem_limit
def get_mem_total(self):
"""Calculate the total memory in the current service unit."""
with open('/proc/meminfo') as meminfo_file:
for line in meminfo_file:
key, mem = line.split(':', 2)
if key == 'MemTotal':
mtot, modifier = mem.strip().split(' ')
return '%s%s' % (mtot, modifier[0].upper())
def parse_config(self):
"""Parse charm configuration and calculate values for config files."""
config = config_get()
mysql_config = {}
if 'max-connections' in config:
mysql_config['max_connections'] = config['max-connections']
if 'wait-timeout' in config:
mysql_config['wait_timeout'] = config['wait-timeout']
if 'innodb-flush-log-at-trx-commit' in config:
mysql_config['innodb_flush_log_at_trx_commit'] = config['innodb-flush-log-at-trx-commit']
# Set a sane default key_buffer size
mysql_config['key_buffer'] = self.human_to_bytes('32M')
total_memory = self.human_to_bytes(self.get_mem_total())
dataset_bytes = config.get('dataset-size', None)
innodb_buffer_pool_size = config.get('innodb-buffer-pool-size', None)
if innodb_buffer_pool_size:
innodb_buffer_pool_size = self.human_to_bytes(
innodb_buffer_pool_size)
elif dataset_bytes:
log("Option 'dataset-size' has been deprecated, please use"
"innodb_buffer_pool_size option instead", level="WARN")
innodb_buffer_pool_size = self.human_to_bytes(
dataset_bytes)
else:
innodb_buffer_pool_size = int(
total_memory * self.DEFAULT_INNODB_BUFFER_FACTOR)
if innodb_buffer_pool_size > total_memory:
log("innodb_buffer_pool_size; {} is greater than system available memory:{}".format(
innodb_buffer_pool_size,
total_memory), level='WARN')
mysql_config['innodb_buffer_pool_size'] = innodb_buffer_pool_size
return mysql_config