/usr/lib/python2.7/dist-packages/barman/server.py is in barman 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This file is part of Barman.
#
# Barman 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, either version 3 of the License, or
# (at your option) any later version.
#
# Barman 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 Barman. If not, see <http://www.gnu.org/licenses/>.
'''This module represents a Server.
Barman is able to manage multiple servers.
'''
from barman import xlog, output
from barman.infofile import BackupInfo, UnknownBackupIdException
from barman.lockfile import LockFile
from barman.backup import BackupManager
from barman.command_wrappers import Command
from barman.retention_policies import RetentionPolicyFactory, SimpleWALRetentionPolicy
import os
import logging
import psycopg2
from contextlib import contextmanager
import itertools
_logger = logging.getLogger(__name__)
class Server(object):
'''This class represents a server to backup'''
XLOG_DB = "xlog.db"
def __init__(self, config):
''' The Constructor.
:param config: the server configuration
'''
self.config = config
self.conn = None
self.server_txt_version = None
self.server_version = None
self.ssh_options = config.ssh_command.split()
self.ssh_command = self.ssh_options.pop(0)
self.ssh_options.extend("-o BatchMode=yes -o StrictHostKeyChecking=no".split())
self.backup_manager = BackupManager(self)
self.configuration_files = None
self.enforce_retention_policies = False
# Set bandwidth_limit
if self.config.bandwidth_limit:
try:
self.config.bandwidth_limit = int(self.config.bandwidth_limit)
except:
_logger.warning('Invalid bandwidth_limit "%s" for server "%s" (fallback to "0")'
% (self.config.bandwidth_limit, self.config.name))
self.config.bandwidth_limit = None
# set tablespace_bandwidth_limit
if self.config.tablespace_bandwidth_limit:
rules = {}
for rule in self.config.tablespace_bandwidth_limit.split():
try:
key, value = rule.split(':', 1)
value = int(value)
if value != self.config.bandwidth_limit:
rules[key] = value
except:
_logger.warning("Invalid tablespace_bandwidth_limit rule '%s'" % (rule,))
if len(rules) > 0:
self.config.tablespace_bandwidth_limit = rules
else:
self.config.tablespace_bandwidth_limit = None
# Set minimum redundancy (default 0)
if self.config.minimum_redundancy.isdigit():
self.config.minimum_redundancy = int(self.config.minimum_redundancy)
if self.config.minimum_redundancy < 0:
_logger.warning('Negative value of minimum_redundancy "%s" for server "%s" (fallback to "0")'
% (self.config.minimum_redundancy, self.config.name))
self.config.minimum_redundancy = 0
else:
_logger.warning('Invalid minimum_redundancy "%s" for server "%s" (fallback to "0")'
% (self.config.minimum_redundancy, self.config.name))
self.config.minimum_redundancy = 0
# Initialise retention policies
self._init_retention_policies()
def _init_retention_policies(self):
# Set retention policy mode
if self.config.retention_policy_mode != 'auto':
_logger.warning('Unsupported retention_policy_mode "%s" for server "%s" (fallback to "auto")'
% (self.config.retention_policy_mode, self.config.name))
self.config.retention_policy_mode = 'auto'
# If retention_policy is present, enforce them
if self.config.retention_policy:
# Check wal_retention_policy
if self.config.wal_retention_policy != 'main':
_logger.warning('Unsupported wal_retention_policy value "%s" for server "%s" (fallback to "main")'
% (self.config.wal_retention_policy, self.config.name))
self.config.wal_retention_policy = 'main'
# Create retention policy objects
try:
rp = RetentionPolicyFactory.create(self,
'retention_policy', self.config.retention_policy)
# Reassign the configuration value (we keep it in one place)
self.config.retention_policy = rp
_logger.debug('Retention policy for server %s: %s' % (
self.config.name, self.config.retention_policy))
try:
rp = RetentionPolicyFactory.create(self,
'wal_retention_policy', self.config.wal_retention_policy)
# Reassign the configuration value (we keep it in one place)
self.wal_retention_policy = rp
_logger.debug('WAL retention policy for server %s: %s' % (
self.config.name, self.config.wal_retention_policy))
except:
_logger.error('Invalid wal_retention_policy setting "%s" for server "%s" (fallback to "main")' % (
self.config.wal_retention_policy, self.config.name))
self.wal_retention_policy = SimpleWALRetentionPolicy (
self.retention_policy, self)
self.enforce_retention_policies = True
except:
_logger.error('Invalid retention_policy setting "%s" for server "%s"' % (
self.config.retention_policy, self.config.name))
def check(self):
"""
Implements the 'server check' command and makes sure SSH and PostgreSQL
connections work properly. It checks also that backup directories exist
(and if not, it creates them).
"""
self.check_ssh()
self.check_postgres()
self.check_directories()
# Check retention policies
self.check_retention_policy_settings()
# Executes the backup manager set of checks
self.backup_manager.check()
def check_ssh(self):
"""
Checks SSH connection
"""
cmd = Command(self.ssh_command, self.ssh_options)
ret = cmd("true")
if ret == 0:
output.result('check', self.config.name, 'ssh', True)
else:
output.result('check', self.config.name, 'ssh', False,
'return code: %s' % ret)
def check_postgres(self):
"""
Checks PostgreSQL connection
"""
remote_status = self.get_remote_status()
if remote_status['server_txt_version']:
output.result('check', self.config.name, 'PostgreSQL', True)
else:
output.result('check', self.config.name, 'PostgreSQL', False)
return
if remote_status['archive_mode'] == 'on':
output.result('check', self.config.name, 'archive_mode', True)
else:
output.result('check', self.config.name, 'archive_mode', False,
"please set it to 'on'")
if remote_status['archive_command'] and\
remote_status['archive_command'] != '(disabled)':
output.result('check', self.config.name, 'archive_command', True)
else:
output.result('check', self.config.name, 'archive_command', False,
'please set it accordingly to documentation')
def _make_directories(self):
"""
Make backup directories in case they do not exist
"""
for key in self.config.KEYS:
if key.endswith('_directory') and hasattr(self.config, key):
val = getattr(self.config, key)
if val is not None and not os.path.isdir(val):
#noinspection PyTypeChecker
os.makedirs(val)
def check_directories(self):
"""
Checks backup directories and creates them if they do not exist
"""
error = None
try:
self._make_directories()
except OSError, e:
output.result('check', self.config.name, 'directories', False,
"%s: %s" % (e.filename, e.strerror))
else:
output.result('check', self.config.name, 'directories', True)
def check_retention_policy_settings(self):
"""
Checks retention policy setting
"""
if self.config.retention_policy and not self.enforce_retention_policies:
output.result('check', self.config.name,
'retention policy settings', False, 'see log')
else:
output.result('check', self.config.name,
'retention policy settings', True)
def status_postgres(self):
"""
Status of PostgreSQL server
"""
remote_status = self.get_remote_status()
if remote_status['server_txt_version']:
output.result('status', self.config.name,
"pg_version",
"PostgreSQL version",
remote_status['server_txt_version'])
else:
output.result('status', self.config.name,
"pg_version",
"PostgreSQL version",
"FAILED trying to get PostgreSQL version")
return
if remote_status['data_directory']:
output.result('status', self.config.name,
"data_directory",
"PostgreSQL Data directory",
remote_status['data_directory'])
output.result('status', self.config.name,
"archive_command",
"PostgreSQL 'archive_command' setting",
remote_status['archive_command']
or "FAILED (please set it accordingly to documentation)")
output.result('status', self.config.name,
"last_shipped_wal",
"Archive status",
"last shipped WAL segment %s" %
remote_status['last_shipped_wal']
or "No WAL segment shipped yet")
if remote_status['current_xlog']:
output.result('status', self.config.name,
"current_xlog",
"Current WAL segment",
remote_status['current_xlog'])
def status_retention_policies(self):
"""
Status of retention policies enforcement
"""
if self.enforce_retention_policies:
output.result('status', self.config.name,
"retention_policies",
"Retention policies",
"enforced "
"(mode: %s, retention: %s, WAL retention: %s)" % (
self.config.retention_policy_mode,
self.config.retention_policy,
self.config.wal_retention_policy))
else:
output.result('status', self.config.name,
"retention_policies",
"Retention policies",
"not enforced")
def status(self):
"""
Implements the 'server-status' command.
"""
if self.config.description:
output.result('status', self.config.name,
"description",
"Description", self.config.description)
self.status_postgres()
self.status_retention_policies()
# Executes the backup manager status info method
self.backup_manager.status()
def get_remote_status(self):
'''Get the status of the remote server'''
pg_settings = ('archive_mode', 'archive_command', 'data_directory')
pg_query_keys = ('server_txt_version', 'current_xlog')
result = dict.fromkeys(pg_settings + pg_query_keys, None)
try:
with self.pg_connect() as conn:
for name in pg_settings:
result[name] = self.get_pg_setting(name)
try:
cur = conn.cursor()
cur.execute("SELECT version()")
result['server_txt_version'] = cur.fetchone()[0].split()[1]
except:
result['server_txt_version'] = None
try:
cur = conn.cursor()
cur.execute('SELECT pg_xlogfile_name(pg_current_xlog_location())')
result['current_xlog'] = cur.fetchone()[0];
except:
result['current_xlog'] = None
result.update(self.get_pg_configuration_files())
except:
pass
cmd = Command(self.ssh_command, self.ssh_options)
result['last_shipped_wal'] = None
if result['data_directory'] and result['archive_command']:
archive_dir = os.path.join(result['data_directory'], 'pg_xlog', 'archive_status')
out = str(cmd.getoutput(None, 'ls', '-tr', archive_dir)[0])
for line in out.splitlines():
if line.endswith('.done'):
name = line[:-5]
if xlog.is_wal_file(name):
result['last_shipped_wal'] = line[:-5]
return result
def show(self):
"""
Shows the server configuration
"""
#Populate result map with all the required keys
result = dict([
(key, getattr(self.config, key))
for key in self.config.KEYS
])
remote_status = self.get_remote_status()
result.update(remote_status)
output.result('show_server', self.config.name, result)
@contextmanager
def pg_connect(self):
'''A generic function to connect to Postgres using Psycopg2'''
myconn = self.conn == None
if myconn:
self.conn = psycopg2.connect(self.config.conninfo)
self.server_version = self.conn.server_version
if (self.server_version >= 90000
and 'application_name=' not in self.config.conninfo):
cur = self.conn.cursor()
cur.execute('SET application_name TO barman')
cur.close()
try:
yield self.conn
finally:
if myconn:
self.conn.close()
self.conn = None
def get_pg_setting(self, name):
'''Get a postgres setting with a given name
:param name: a parameter name
'''
with self.pg_connect() as conn:
try:
cur = conn.cursor()
cur.execute('SHOW "%s"' % name.replace('"', '""'))
return cur.fetchone()[0]
except:
return None
def get_pg_tablespaces(self):
'''Returns a list of tablespaces or None if not present'''
with self.pg_connect() as conn:
try:
cur = conn.cursor()
if self.server_version >= 90200:
cur.execute("SELECT spcname, oid, pg_tablespace_location(oid) AS spclocation FROM pg_tablespace WHERE pg_tablespace_location(oid) != ''")
else:
cur.execute("SELECT spcname, oid, spclocation FROM pg_tablespace WHERE spclocation != ''")
return cur.fetchall()
except:
return None
def get_pg_configuration_files(self):
'''Get postgres configuration files or None in case of error'''
if self.configuration_files:
return self.configuration_files
with self.pg_connect() as conn:
try:
cur = conn.cursor()
cur.execute("SELECT name, setting FROM pg_settings WHERE name IN ('config_file', 'hba_file', 'ident_file')")
self.configuration_files = {}
for cname, cpath in cur.fetchall():
self.configuration_files[cname] = cpath
return self.configuration_files
except:
return None
def pg_start_backup(self, backup_label, immediate_checkpoint):
"""
Execute a pg_start_backup
:param backup_label: label for the backup
:param immediate_checkpoint Boolean for immediate checkpoint execution
"""
with self.pg_connect() as conn:
try:
cur = conn.cursor()
cur.execute('SELECT xlog_loc, (pg_xlogfile_name_offset(xlog_loc)).* from pg_start_backup(%s,%s) as xlog_loc',
(backup_label, immediate_checkpoint))
return cur.fetchone()
except:
return None
def pg_stop_backup(self):
'''Execute a pg_stop_backup'''
with self.pg_connect() as conn:
try:
cur = conn.cursor()
cur.execute('SELECT xlog_loc, (pg_xlogfile_name_offset(xlog_loc)).* from pg_stop_backup() as xlog_loc')
return cur.fetchone()
except:
return None
def delete_backup(self, backup):
'''Deletes a backup
:param backup: the backup to delete
'''
return self.backup_manager.delete_backup(backup)
def backup(self, immediate_checkpoint):
'''Performs a backup for the server'''
try:
# check required backup directories exist
self._make_directories()
except OSError, e:
output.error('failed to create %s directory: %s',
e.filename, e.strerror)
else:
self.backup_manager.backup(immediate_checkpoint)
def get_available_backups(self, status_filter=BackupManager.DEFAULT_STATUS_FILTER):
'''Get a list of available backups
param: status_filter: the status of backups to return, default to BackupManager.DEFAULT_STATUS_FILTER
'''
return self.backup_manager.get_available_backups(status_filter)
def get_last_backup(self, status_filter=BackupManager.DEFAULT_STATUS_FILTER):
'''
Get the last backup (if any) in the catalog
:param status_filter: default DEFAULT_STATUS_FILTER. The status of the backup returned
'''
return self.backup_manager.get_last_backup(status_filter)
def get_first_backup(self, status_filter=BackupManager.DEFAULT_STATUS_FILTER):
'''
Get the first backup (if any) in the catalog
:param status_filter: default DEFAULT_STATUS_FILTER. The status of the backup returned
'''
return self.backup_manager.get_first_backup(status_filter)
def list_backups(self):
"""
Lists all the available backups for the server
"""
status_filter = BackupInfo.STATUS_NOT_EMPTY
retention_status = self.report_backups()
backups = self.get_available_backups(status_filter)
for key in sorted(backups.iterkeys(), reverse=True):
backup = backups[key]
backup_size = 0
wal_size = 0
rstatus = None
if backup.status == BackupInfo.DONE:
wal_info = self.get_wal_info(backup)
backup_size = backup.size or 0 + wal_info['wal_size']
wal_size = wal_info['wal_until_next_size']
if self.enforce_retention_policies and \
retention_status[backup.backup_id] != BackupInfo.VALID:
rstatus = retention_status[backup.backup_id]
output.result('list_backup', backup, backup_size, wal_size, rstatus)
def get_backup(self, backup_id):
'''Return the backup information for the given backup,
or None if its status is not empty
:param backup_id: the ID of the backup to return
'''
try:
backup = BackupInfo(self, backup_id=backup_id)
if backup.status in BackupInfo.STATUS_NOT_EMPTY:
return backup
return None
except:
return None
def get_previous_backup(self, backup_id):
'''Get the previous backup (if any) from the catalog
:param backup_id: the backup id from which return the previous
'''
return self.backup_manager.get_previous_backup(backup_id)
def get_next_backup(self, backup_id):
'''Get the next backup (if any) from the catalog
:param backup_id: the backup id from which return the next
'''
return self.backup_manager.get_next_backup(backup_id)
def get_required_xlog_files(self, backup, target_tli=None, target_time=None, target_xid=None):
'''Get the xlog files required for a backup'''
begin = backup.begin_wal
end = backup.end_wal
# If timeline isn't specified, assume it is the same timeline of the backup
if not target_tli:
target_tli, _, _ = xlog.decode_segment_name(end)
with self.xlogdb() as fxlogdb:
for line in fxlogdb:
name, _, stamp, _ = self.xlogdb_parse_line(line)
if name < begin: continue
tli, _, _ = xlog.decode_segment_name(name)
if tli > target_tli: continue
yield name
if name > end:
end = name
if target_time and target_time < stamp:
break
# return all the remaining history files
for line in fxlogdb:
name, _, stamp, _ = self.xlogdb_parse_line(line)
if xlog.is_history_file(name):
yield name
# TODO: merge with the previous
def get_wal_until_next_backup(self, backup):
'''Get the xlog files between backup and the next
:param backup: a backup object, the starting point to retrieve wals
'''
begin = backup.begin_wal
next_end = None
if self.get_next_backup(backup.backup_id):
next_end = self.get_next_backup(backup.backup_id).end_wal
backup_tli, _, _ = xlog.decode_segment_name(begin)
with self.xlogdb() as fxlogdb:
for line in fxlogdb:
name, size, _, _ = self.xlogdb_parse_line(line)
if name < begin: continue
tli, _, _ = xlog.decode_segment_name(name)
if tli > backup_tli: continue
if not xlog.is_wal_file(name): continue
if next_end and name > next_end:
break
# count
yield (name, size)
def get_wal_info(self, backup_info):
"""
Returns information about WALs for the given backup
:param BackupInfo backup_info: the target backup
"""
end = backup_info.end_wal
# counters
wal_info = dict.fromkeys(
('wal_num', 'wal_size',
'wal_until_next_num', 'wal_until_next_size'), 0)
wal_info['wal_last'] = None
for name, size in self.get_wal_until_next_backup(backup_info):
if name <= end:
wal_info['wal_num'] += 1
wal_info['wal_size'] += size
else:
wal_info['wal_until_next_num'] += 1
wal_info['wal_until_next_size'] += size
wal_info['wal_last'] = name
return wal_info
def recover(self, backup, dest, tablespaces=[], target_tli=None, target_time=None, target_xid=None, target_name=None, exclusive=False, remote_command=None):
'''Performs a recovery of a backup'''
return self.backup_manager.recover(backup, dest, tablespaces, target_tli, target_time, target_xid, target_name, exclusive, remote_command)
def cron(self, verbose=True):
'''Maintenance operations
:param verbose: turn on verbose mode. default True
'''
return self.backup_manager.cron(verbose)
@contextmanager
def xlogdb(self, mode='r'):
"""
Context manager to access the xlogdb file.
This method uses locking to make sure only one process is accessing
the database at a time. The database file will be created if not exists.
Usage example:
with server.xlogdb('w') ad file:
file.write(new_line)
:param str mode: open the file with the required mode
(default read-only)
"""
if not os.path.exists(self.config.wals_directory):
os.makedirs(self.config.wals_directory)
xlogdb = os.path.join(self.config.wals_directory, self.XLOG_DB)
# If the file doesn't exist and it is required to read it,
# we open it in a+ mode, to be sure it will be created
if not os.path.exists(xlogdb) and mode.startswith('r'):
if '+' not in mode:
mode = "a%s+" % mode[1:]
else:
mode = "a%s" % mode[1:]
xlogdb_lock = xlogdb + ".lock"
with LockFile(xlogdb_lock, wait=True):
with open(xlogdb, mode) as f:
# execute the block nested in the with statement
yield f
# we are exiting the context
# make sure the data is written to disk
# http://docs.python.org/2/library/os.html#os.fsync
f.flush()
os.fsync(f.fileno())
def xlogdb_parse_line(self, line):
'''Parse a line from xlog catalogue
:param line: a line in the wal database to parse
'''
try:
name, size, stamp, compression = line.split()
except ValueError:
# Old format compatibility (no compression)
compression = None
try:
name, size, stamp = line.split()
except:
raise ValueError("cannot parse line: %r" % (line,))
return name, int(size), float(stamp), compression
def report_backups(self):
if not self.enforce_retention_policies:
return dict()
else:
return self.config.retention_policy.report()
def rebuild_xlogdb(self):
"""
Rebuild the whole xlog database guessing it from the archive content.
"""
return self.backup_manager.rebuild_xlogdb()
def get_backup_ext_info(self, backup_info):
"""
Return a dictionary containing all available information about a backup
The result is equivalent to the sum of information from
* BackupInfo object
* the Server.get_wal_info() return value
* the context in the catalog (if available)
* the retention policy status
:param backup_info: the target backup
:rtype dict: all information about a backup
"""
backup_ext_info = backup_info.to_dict()
if backup_info.status == BackupInfo.DONE:
try:
previous_backup = self.backup_manager.get_previous_backup(
backup_ext_info['backup_id'])
next_backup = self.backup_manager.get_next_backup(
backup_ext_info['backup_id'])
if previous_backup:
backup_ext_info[
'previous_backup_id'] = previous_backup.backup_id
else:
backup_ext_info['previous_backup_id'] = None
if next_backup:
backup_ext_info['next_backup_id'] = next_backup.backup_id
else:
backup_ext_info['next_backup_id'] = None
except UnknownBackupIdException:
# no next_backup_id and previous_backup_id items
# means "Not available"
pass
backup_ext_info.update(self.get_wal_info(backup_info))
if self.enforce_retention_policies:
policy = self.config.retention_policy
backup_ext_info['retention_policy_status'] = \
policy.backup_status(backup_info.backup_id)
else:
backup_ext_info['retention_policy_status'] = None
return backup_ext_info
def show_backup(self, backup_info):
"""
Output all available information about a backup
:param backup_info: the target backup
"""
backup_ext_info = self.get_backup_ext_info(backup_info)
output.result('show_backup', backup_ext_info)
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