def receive_wal(self, reset=False):
"""
Creates a PgReceiveXlog object and issues the pg_receivexlog command
for a specific server
:param bool reset: When set reset the status of receive-wal
:raise ArchiverFailure: when something goes wrong
"""
# Ensure the presence of the destination directory
mkpath(self.config.streaming_wals_directory)
# Execute basic sanity checks on PostgreSQL connection
streaming_status = self.server.streaming.get_remote_status()
if streaming_status["streaming_supported"] is None:
raise ArchiverFailure(
"failed opening the PostgreSQL streaming connection "
"for server %s" % (self.config.name))
elif not streaming_status["streaming_supported"]:
raise ArchiverFailure("PostgreSQL version too old (%s < 9.2)" %
self.server.streaming.server_txt_version)
# Execute basic sanity checks on pg_receivexlog
command = "pg_receivewal"
if self.server.streaming.server_version < 100000:
command = "pg_receivexlog"
remote_status = self.get_remote_status()
if not remote_status["pg_receivexlog_installed"]:
raise ArchiverFailure("%s not present in $PATH" % command)
if not remote_status["pg_receivexlog_compatible"]:
raise ArchiverFailure(
"%s version not compatible with PostgreSQL server version" %
command)
# Execute sanity check on replication slot usage
postgres_status = self.server.postgres.get_remote_status()
if self.config.slot_name:
# Check if slots are supported
if not remote_status["pg_receivexlog_supports_slots"]:
raise ArchiverFailure(
"Physical replication slot not supported by %s "
"(9.4 or higher is required)" %
self.server.streaming.server_txt_version)
# Check if the required slot exists
if postgres_status["replication_slot"] is None:
if self.config.create_slot == "auto":
if not reset:
output.info("Creating replication slot '%s'",
self.config.slot_name)
self.server.create_physical_repslot()
else:
raise ArchiverFailure(
"replication slot '%s' doesn't exist. "
"Please execute "
"'barman receive-wal --create-slot %s'" %
(self.config.slot_name, self.config.name))
# Check if the required slot is available
elif postgres_status["replication_slot"].active:
raise ArchiverFailure(
"replication slot '%s' is already in use" %
(self.config.slot_name, ))
# Check if is a reset request
if reset:
self._reset_streaming_status(postgres_status, streaming_status)
return
# Check the size of the .partial WAL file and truncate it if needed
self._truncate_partial_file_if_needed(
postgres_status["xlog_segment_size"])
# Make sure we are not wasting precious PostgreSQL resources
self.server.close()
_logger.info("Activating WAL archiving through streaming protocol")
try:
output_handler = PgReceiveXlog.make_output_handler(
self.config.name + ": ")
receive = PgReceiveXlog(
connection=self.server.streaming,
destination=self.config.streaming_wals_directory,
command=remote_status["pg_receivexlog_path"],
version=remote_status["pg_receivexlog_version"],
app_name=self.config.streaming_archiver_name,
path=self.server.path,
slot_name=self.config.slot_name,
synchronous=remote_status["pg_receivexlog_synchronous"],
out_handler=output_handler,
err_handler=output_handler,
)
# Finally execute the pg_receivexlog process
receive.execute()
except CommandFailedException as e:
# Retrieve the return code from the exception
ret_code = e.args[0]["ret"]
if ret_code < 0:
# If the return code is negative, then pg_receivexlog
# was terminated by a signal
msg = "%s terminated by signal: %s" % (command, abs(ret_code))
else:
# Otherwise terminated with an error
msg = "%s terminated with error code: %s" % (command, ret_code)
raise ArchiverFailure(msg)
except KeyboardInterrupt:
# This is a normal termination, so there is nothing to do beside
# informing the user.
output.info("SIGINT received. Terminate gracefully.")
def receive_wal(self, reset=False):
"""
Creates a PgReceiveXlog object and issues the pg_receivexlog command
for a specific server
:param bool reset: When set reset the status of receive-wal
:raise ArchiverFailure: when something goes wrong
"""
# Ensure the presence of the destination directory
mkpath(self.config.streaming_wals_directory)
# Check if is a reset request
if reset:
self._reset_streaming_status()
return
# Execute basic sanity checks on PostgreSQL connection
streaming_status = self.server.streaming.get_remote_status()
if streaming_status["streaming_supported"] is None:
raise ArchiverFailure(
'failed opening the PostgreSQL streaming connection '
'for server %s' % (self.config.name))
elif not streaming_status["streaming_supported"]:
raise ArchiverFailure('PostgreSQL version too old (%s < 9.2)' %
self.server.streaming.server_txt_version)
# Execute basic sanity checks on pg_receivexlog
remote_status = self.get_remote_status()
if not remote_status["pg_receivexlog_installed"]:
raise ArchiverFailure('pg_receivexlog not present in $PATH')
if not remote_status['pg_receivexlog_compatible']:
raise ArchiverFailure('pg_receivexlog version not compatible with '
'PostgreSQL server version')
# Execute sanity check on replication slot usage
if self.config.slot_name:
# Check if slots are supported
if not remote_status['pg_receivexlog_supports_slots']:
raise ArchiverFailure(
'Physical replication slot not supported by %s '
'(9.4 or higher is required)' %
self.server.streaming.server_txt_version)
# Check if the required slot exists
postgres_status = self.server.postgres.get_remote_status()
if postgres_status['replication_slot'] is None:
raise ArchiverFailure(
"replication slot '%s' doesn't exist. "
"Please execute "
"'barman receive-wal --create-slot %s'" %
(self.config.slot_name, self.config.name))
# Check if the required slot is available
if postgres_status['replication_slot'].active:
raise ArchiverFailure(
"replication slot '%s' is already in use" %
(self.config.slot_name, ))
# Make sure we are not wasting precious PostgreSQL resources
self.server.close()
_logger.info('Activating WAL archiving through streaming protocol')
try:
output_handler = PgReceiveXlog.make_output_handler(
self.config.name + ': ')
receive = PgReceiveXlog(
connection=self.server.streaming,
destination=self.config.streaming_wals_directory,
command=remote_status['pg_receivexlog_path'],
version=remote_status['pg_receivexlog_version'],
app_name=self.config.streaming_archiver_name,
path=self.server.path,
slot_name=self.config.slot_name,
synchronous=remote_status['pg_receivexlog_synchronous'],
out_handler=output_handler,
err_handler=output_handler)
# Finally execute the pg_receivexlog process
receive.execute()
except CommandFailedException as e:
# Retrieve the return code from the exception
ret_code = e.args[0]['ret']
if ret_code < 0:
# If the return code is negative, then pg_receivexlog
# was terminated by a signal
msg = "pg_receivexlog terminated by signal: %s" \
% abs(ret_code)
else:
# Otherwise terminated with an error
msg = "pg_receivexlog terminated with error code: %s"\
% ret_code
raise ArchiverFailure(msg)
except KeyboardInterrupt:
# This is a normal termination, so there is nothing to do beside
# informing the user.
output.info('SIGINT received. Terminate gracefully.')
def receive_wal(self, reset=False):
"""
Creates a PgReceiveXlog object and issues the pg_receivexlog command
for a specific server
:param bool reset: When set reset the status of receive-wal
:raise ArchiverFailure: when something goes wrong
"""
# Ensure the presence of the destination directory
mkpath(self.config.streaming_wals_directory)
# Check if is a reset request
if reset:
self._reset_streaming_status()
return
# Execute basic sanity checks on PostgreSQL connection
postgres_status = self.server.streaming.get_remote_status()
if postgres_status["streaming_supported"] is None:
raise ArchiverFailure(
'failed opening the PostgreSQL streaming connection')
elif not postgres_status["streaming_supported"]:
raise ArchiverFailure('PostgreSQL version too old (%s < 9.2)' %
self.server.streaming.server_txt_version)
# Execute basic sanity checks on pg_receivexlog
remote_status = self.get_remote_status()
if not remote_status["pg_receivexlog_installed"]:
raise ArchiverFailure('pg_receivexlog not present in $PATH')
if not remote_status['pg_receivexlog_compatible']:
raise ArchiverFailure('pg_receivexlog version not compatible with '
'PostgreSQL server version')
# Make sure we are not wasting precious PostgreSQL resources
self.server.close()
_logger.info('Activating WAL archiving through streaming protocol')
try:
output_handler = PgReceiveXlog.make_output_handler(
self.config.name + ': ')
if remote_status['pg_receivexlog_version'] >= "9.3":
conn_string = self.config.streaming_conninfo
# Set a default application_name unless defined by user
if ('application_name'
not in self.server.streaming.conn_parameters):
conn_string += ' application_name=%s' % (
self.config.streaming_archiver_name)
# If pg_receivexlog version is >= 9.3 we use the connection
# string because allows the user to use all the parameters
# supported by the libpq library to create a connection
receive = PgReceiveXlog(
remote_status['pg_receivexlog_path'],
conn_string=conn_string,
dest=self.config.streaming_wals_directory,
out_handler=output_handler,
err_handler=output_handler)
else:
# 9.2 version of pg_receivexlog doesn't support
# connection strings so the 'split' version of the conninfo
# option is used instead.
conn_params = self.server.streaming.conn_parameters
receive = PgReceiveXlog(
remote_status['pg_receivexlog_path'],
host=conn_params.get('host', None),
port=conn_params.get('port', None),
user=conn_params.get('user', None),
dest=self.config.streaming_wals_directory,
out_handler=output_handler,
err_handler=output_handler)
# Finally execute the pg_receivexlog process
receive.execute()
except CommandFailedException as e:
_logger.error(e)
raise ArchiverFailure("pg_receivexlog exited with an error. "
"Check the logs for more information.")
except KeyboardInterrupt:
# This is a normal termination, so there is nothing to do beside
# informing the user.
output.info('SIGINT received. Terminate gracefully.')
