def tar_one_file(self, *, temp_dir, chunk_path, files_to_backup, callback_queue,
filetype="basebackup_chunk", extra_metadata=None):
start_time = time.monotonic()
encryption_key_id = self.config["backup_sites"][self.site]["encryption_key_id"]
if encryption_key_id:
rsa_public_key = self.config["backup_sites"][self.site]["encryption_keys"][encryption_key_id]["public"]
else:
rsa_public_key = None
with NamedTemporaryFile(dir=temp_dir, prefix=os.path.basename(chunk_path), suffix=".tmp") as raw_output_obj:
# pylint: disable=bad-continuation
with rohmufile.file_writer(
compression_algorithm=self.config["compression"]["algorithm"],
compression_level=self.config["compression"]["level"],
rsa_public_key=rsa_public_key,
fileobj=raw_output_obj) as output_obj:
with tarfile.TarFile(fileobj=output_obj, mode="w") as output_tar:
self.write_files_to_tar(files=files_to_backup, tar=output_tar)
input_size = output_obj.tell()
result_size = raw_output_obj.tell()
# Make the file persist over the with-block with this hardlink
os.link(raw_output_obj.name, chunk_path)
rohmufile.log_compression_result(
encrypted=True if encryption_key_id else False,
elapsed=time.monotonic() - start_time,
original_size=input_size,
result_size=result_size,
source_name="$PGDATA files ({})".format(len(files_to_backup)),
log_func=self.log.info,
)
metadata = {
"compression-algorithm": self.config["compression"]["algorithm"],
"encryption-key-id": encryption_key_id,
"format": "pghoard-bb-v2",
"original-file-size": input_size,
}
if extra_metadata:
metadata.update(extra_metadata)
self.transfer_queue.put({
"callback_queue": callback_queue,
"file_size": result_size,
"filetype": filetype,
"local_path": chunk_path,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
})
# Get the name of the chunk and the name of the parent directory (ie backup "name")
chunk_name = "/".join(chunk_path.split("/")[-2:])
return chunk_name, input_size, result_size
def run_local_tar_basebackup(self):
_, compressed_basebackup = self.get_paths_for_backup(self.basebackup_path)
compression_algorithm = self.config["compression"]["algorithm"]
compression_level = self.config["compression"]["level"]
rsa_public_key = None
encryption_key_id = self.config["backup_sites"][self.site]["encryption_key_id"]
if encryption_key_id:
rsa_public_key = self.config["backup_sites"][self.site]["encryption_keys"][encryption_key_id]["public"]
self.log.debug("Connecting to database to start backup process")
connection_string = connection_string_using_pgpass(self.connection_info)
with psycopg2.connect(connection_string) as db_conn:
cursor = db_conn.cursor()
cursor.execute("SELECT pg_start_backup(%s)", [BASEBACKUP_NAME])
try:
cursor.execute("SELECT setting FROM pg_settings WHERE name='data_directory'")
pgdata = cursor.fetchone()[0]
# Look up tablespaces and resolve their current filesystem locations
cursor.execute("SELECT oid, spcname FROM pg_tablespace WHERE spcname NOT IN ('pg_default', 'pg_global')")
tablespaces = {
spcname: {
"path": os.readlink(os.path.join(pgdata, "pg_tblspc", str(oid))),
"oid": oid,
}
for oid, spcname in cursor.fetchall()
}
with open(os.path.join(pgdata, "backup_label"), "rb") as fp:
start_wal_segment, backup_start_time = self.parse_backup_label(fp.read())
self.log.info("Starting to backup %r to %r", pgdata, compressed_basebackup)
start_time = time.monotonic()
with NamedTemporaryFile(prefix=compressed_basebackup, suffix=".tmp-compress") as raw_output_obj:
with rohmufile.file_writer(fileobj=raw_output_obj,
compression_algorithm=compression_algorithm,
compression_level=compression_level,
rsa_public_key=rsa_public_key) as output_obj:
with tarfile.open(fileobj=output_obj, mode="w|") as output_tar:
self.write_files_to_tar(pgdata=pgdata, tablespaces=tablespaces, tar=output_tar)
input_size = output_obj.tell()
os.link(raw_output_obj.name, compressed_basebackup)
result_size = raw_output_obj.tell()
rohmufile.log_compression_result(
elapsed=time.monotonic() - start_time,
encrypted=True if rsa_public_key else False,
log_func=self.log.info,
original_size=input_size,
result_size=result_size,
source_name=pgdata,
)
finally:
db_conn.rollback()
cursor.execute("SELECT pg_stop_backup()")
metadata = {
"compression-algorithm": compression_algorithm,
"encryption-key-id": encryption_key_id,
"format": "pghoard-bb-v1",
"original-file-size": input_size,
"pg-version": self.pg_version_server,
"start-time": backup_start_time,
"start-wal-segment": start_wal_segment,
}
for spcname, spcinfo in tablespaces.items():
metadata["tablespace-name-{}".format(spcinfo["oid"])] = spcname
metadata["tablespace-path-{}".format(spcinfo["oid"])] = spcinfo["path"]
self.transfer_queue.put({
"callback_queue": self.callback_queue,
"file_size": result_size,
"filetype": "basebackup",
"local_path": compressed_basebackup,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
})
def run_local_tar_basebackup(self):
pgdata = self.config["backup_sites"][self.site]["pg_data_directory"]
if not os.path.isdir(pgdata):
raise errors.InvalidConfigurationError(
"pg_data_directory {!r} does not exist".format(pgdata))
temp_basebackup_dir, compressed_basebackup = self.get_paths_for_backup(
self.basebackup_path)
compression_algorithm = self.config["compression"]["algorithm"]
compression_level = self.config["compression"]["level"]
rsa_public_key = None
encryption_key_id = self.config["backup_sites"][
self.site]["encryption_key_id"]
if encryption_key_id:
rsa_public_key = self.config["backup_sites"][
self.site]["encryption_keys"][encryption_key_id]["public"]
self.log.debug("Connecting to database to start backup process")
connection_string = connection_string_using_pgpass(
self.connection_info)
with psycopg2.connect(connection_string) as db_conn:
cursor = db_conn.cursor()
if self.pg_version_server >= 90600:
# We'll always use the the non-exclusive backup mode on 9.6 and newer
cursor.execute("SELECT pg_start_backup(%s, false, false)",
[BASEBACKUP_NAME])
backup_label = None
backup_mode = "non-exclusive"
else:
# On older versions, first check if we're in recovery, and find out the version of a possibly
# installed pgespresso extension. We use pgespresso's backup control functions when they're
# available, and require them in case we're running on a replica. We also make sure the
# extension version is 1.2 or newer to prevent crashing when using tablespaces.
cursor.execute(
"SELECT pg_is_in_recovery(), "
" (SELECT extversion FROM pg_extension WHERE extname = 'pgespresso')"
)
in_recovery, pgespresso_version = cursor.fetchone()
if in_recovery and (not pgespresso_version
or pgespresso_version < "1.2"):
raise errors.InvalidConfigurationError(
"pgespresso version 1.2 or higher must be installed "
"to take `local-tar` backups from a replica")
if pgespresso_version and pgespresso_version >= "1.2":
cursor.execute("SELECT pgespresso_start_backup(%s, false)",
[BASEBACKUP_NAME])
backup_label = cursor.fetchone()[0]
backup_mode = "pgespresso"
else:
try:
cursor.execute("SELECT pg_start_backup(%s)",
[BASEBACKUP_NAME])
except psycopg2.OperationalError as ex:
self.log.warning(
"Exclusive pg_start_backup() failed: %s: %s",
ex.__class__.__name__, ex)
db_conn.rollback()
if "a backup is already in progress" not in str(ex):
raise
self.log.info("Calling pg_stop_backup() and retrying")
cursor.execute("SELECT pg_stop_backup()")
cursor.execute("SELECT pg_start_backup(%s)",
[BASEBACKUP_NAME])
with open(os.path.join(pgdata, "backup_label"), "r") as fp:
backup_label = fp.read()
backup_mode = "legacy"
backup_stopped = False
try:
# Look up tablespaces and resolve their current filesystem locations
cursor.execute(
"SELECT oid, spcname FROM pg_tablespace WHERE spcname NOT IN ('pg_default', 'pg_global')"
)
tablespaces = {
spcname: {
"path":
os.readlink(os.path.join(pgdata, "pg_tblspc",
str(oid))),
"oid":
oid,
}
for oid, spcname in cursor.fetchall()
}
db_conn.commit()
self.log.info("Starting to backup %r to %r", pgdata,
compressed_basebackup)
start_time = time.monotonic()
with NamedTemporaryFile(
dir=temp_basebackup_dir,
prefix="data.",
suffix=".tmp-compress") as raw_output_obj:
with rohmufile.file_writer(
fileobj=raw_output_obj,
compression_algorithm=compression_algorithm,
compression_level=compression_level,
rsa_public_key=rsa_public_key) as output_obj:
with tarfile.TarFile(fileobj=output_obj,
mode="w") as output_tar:
self.write_init_entries_to_tar(
pgdata=pgdata,
tablespaces=tablespaces,
tar=output_tar)
files = self.find_files_to_backup(
pgdata=pgdata,
tablespaces=tablespaces) # NOTE: generator
self.write_files_to_tar(files=files,
tar=output_tar)
self.write_pg_control_to_tar(pgdata=pgdata,
tar=output_tar)
# Call the stop backup functions now to get backup label for 9.6+ non-exclusive backups
if backup_mode == "non-exclusive":
cursor.execute(
"SELECT labelfile FROM pg_stop_backup(false)"
)
backup_label = cursor.fetchone()[0]
elif backup_mode == "pgespresso":
cursor.execute(
"SELECT pgespresso_stop_backup(%s)",
[backup_label])
else:
cursor.execute("SELECT pg_stop_backup()")
db_conn.commit()
backup_stopped = True
backup_label_data = backup_label.encode("utf-8")
self.write_backup_label_to_tar(
tar=output_tar, backup_label=backup_label_data)
input_size = output_obj.tell()
os.link(raw_output_obj.name, compressed_basebackup)
result_size = raw_output_obj.tell()
rohmufile.log_compression_result(
elapsed=time.monotonic() - start_time,
encrypted=True if rsa_public_key else False,
log_func=self.log.info,
original_size=input_size,
result_size=result_size,
source_name=pgdata,
)
finally:
db_conn.rollback()
if not backup_stopped:
if backup_mode == "non-exclusive":
cursor.execute("SELECT pg_stop_backup(false)")
elif backup_mode == "pgespresso":
cursor.execute("SELECT pgespresso_stop_backup(%s)",
[backup_label])
else:
cursor.execute("SELECT pg_stop_backup()")
db_conn.commit()
backup_end_time, backup_end_wal_segment = self.get_backup_end_time_and_segment(
db_conn, backup_mode)
backup_start_wal_segment, backup_start_time = self.parse_backup_label(
backup_label_data)
metadata = {
"compression-algorithm": compression_algorithm,
"encryption-key-id": encryption_key_id,
"end-time": backup_end_time,
"end-wal-segment": backup_end_wal_segment,
"format": "pghoard-bb-v1",
"original-file-size": input_size,
"pg-version": self.pg_version_server,
"start-time": backup_start_time,
"start-wal-segment": backup_start_wal_segment,
}
for spcname, spcinfo in tablespaces.items():
metadata["tablespace-name-{}".format(spcinfo["oid"])] = spcname
metadata["tablespace-path-{}".format(
spcinfo["oid"])] = spcinfo["path"]
self.transfer_queue.put({
"callback_queue": self.callback_queue,
"file_size": result_size,
"filetype": "basebackup",
"local_path": compressed_basebackup,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
})
def tar_one_file(
self, *, temp_dir, chunk_path, files_to_backup, callback_queue, filetype="basebackup_chunk", extra_metadata=None
):
start_time = time.monotonic()
with NamedTemporaryFile(dir=temp_dir, prefix=os.path.basename(chunk_path), suffix=".tmp") as raw_output_obj:
# pylint: disable=bad-continuation
with rohmufile.file_writer(
compression_algorithm=self.compression_data.algorithm,
compression_level=self.compression_data.level,
compression_threads=self.site_config["basebackup_compression_threads"],
rsa_public_key=self.encryption_data.rsa_public_key,
fileobj=raw_output_obj
) as output_obj:
with tarfile.TarFile(fileobj=output_obj, mode="w") as output_tar:
self.write_files_to_tar(files=files_to_backup, tar=output_tar)
input_size = output_obj.tell()
result_size = raw_output_obj.tell()
# Make the file persist over the with-block with this hardlink
os.link(raw_output_obj.name, chunk_path)
rohmufile.log_compression_result(
encrypted=bool(self.encryption_data.encryption_key_id),
elapsed=time.monotonic() - start_time,
original_size=input_size,
result_size=result_size,
source_name="$PGDATA files ({})".format(len(files_to_backup)),
log_func=self.log.info,
)
size_ratio = result_size / input_size
self.metrics.gauge(
"pghoard.compressed_size_ratio",
size_ratio,
tags={
"algorithm": self.compression_data.algorithm,
"site": self.site,
"type": "basebackup",
}
)
metadata = {
"compression-algorithm": self.compression_data.algorithm,
"encryption-key-id": self.encryption_data.encryption_key_id,
"format": BaseBackupFormat.v2,
"original-file-size": input_size,
"host": socket.gethostname(),
}
if extra_metadata:
metadata.update(extra_metadata)
self.transfer_queue.put({
"callback_queue": callback_queue,
"file_size": result_size,
"filetype": filetype,
"local_path": chunk_path,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
})
# Get the name of the chunk and the name of the parent directory (ie backup "name")
chunk_name = "/".join(chunk_path.split("/")[-2:])
return chunk_name, input_size, result_size
def _delta_upload_hexdigest(self, *, temp_dir, chunk_path, file_obj,
callback_queue, relative_path):
skip_upload = False
start_time = time.monotonic()
input_size = file_obj.seek(0, os.SEEK_END)
file_obj.seek(0)
result_hash = hashlib.blake2s()
def update_hash(data):
result_hash.update(data)
with NamedTemporaryFile(dir=temp_dir,
prefix=os.path.basename(chunk_path),
suffix=".tmp") as raw_output_obj:
rohmufile.write_file(
input_obj=file_obj,
output_obj=raw_output_obj,
compression_algorithm=self.compression_data.algorithm,
compression_level=self.compression_data.level,
rsa_public_key=self.encryption_data.rsa_public_key,
log_func=self.log.info,
data_callback=update_hash)
result_size = raw_output_obj.tell()
raw_output_obj.seek(0)
result_digest = result_hash.hexdigest()
with self.submitted_hashes_lock:
if result_digest in self.submitted_hashes:
# file with the same hash was already submitted
self.log.debug(
"Skip uploading file %r, file with the same was hash already submitted for uploading",
relative_path)
skip_upload = True
return input_size, result_size, result_digest, skip_upload
else:
self.submitted_hashes.add(result_digest)
os.link(raw_output_obj.name, chunk_path)
rohmufile.log_compression_result(
encrypted=bool(self.encryption_data.encryption_key_id),
elapsed=time.monotonic() - start_time,
original_size=input_size,
result_size=result_size,
source_name="$PGDATA delta basebackup file",
log_func=self.log.info,
)
if input_size:
size_ratio = result_size / input_size
self.metrics.gauge("pghoard.compressed_size_ratio",
size_ratio,
tags={
"algorithm":
self.compression_data.algorithm,
"site": self.site,
"type": "basebackup_delta",
})
metadata = {
"compression-algorithm": self.compression_data.algorithm,
"encryption-key-id": self.encryption_data.encryption_key_id,
"format": BaseBackupFormat.delta_v1,
"original-file-size": input_size,
"host": socket.gethostname(),
}
self.transfer_queue.put({
"callback_queue": callback_queue,
"file_size": result_size,
"filetype": "basebackup_delta",
"local_path": chunk_path,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
"delta": {
"hexdigest": result_digest,
},
})
return input_size, result_size, result_digest, skip_upload
def tar_one_file(self, *, temp_dir, chunk_path, files_to_backup, callback_queue,
filetype="basebackup_chunk", extra_metadata=None):
start_time = time.monotonic()
encryption_key_id = self.config["backup_sites"][self.site]["encryption_key_id"]
if encryption_key_id:
rsa_public_key = self.config["backup_sites"][self.site]["encryption_keys"][encryption_key_id]["public"]
else:
rsa_public_key = None
with NamedTemporaryFile(dir=temp_dir, prefix=os.path.basename(chunk_path), suffix=".tmp") as raw_output_obj:
# pylint: disable=bad-continuation
with rohmufile.file_writer(
compression_algorithm=self.config["compression"]["algorithm"],
compression_level=self.config["compression"]["level"],
rsa_public_key=rsa_public_key,
fileobj=raw_output_obj) as output_obj:
with tarfile.TarFile(fileobj=output_obj, mode="w") as output_tar:
self.write_files_to_tar(files=files_to_backup, tar=output_tar)
input_size = output_obj.tell()
result_size = raw_output_obj.tell()
# Make the file persist over the with-block with this hardlink
os.link(raw_output_obj.name, chunk_path)
rohmufile.log_compression_result(
encrypted=bool(encryption_key_id),
elapsed=time.monotonic() - start_time,
original_size=input_size,
result_size=result_size,
source_name="$PGDATA files ({})".format(len(files_to_backup)),
log_func=self.log.info,
)
size_ratio = result_size / input_size
self.metrics.gauge(
"pghoard.compressed_size_ratio", size_ratio,
tags={
"algorithm": self.config["compression"]["algorithm"],
"site": self.site,
"type": "basebackup",
}
)
metadata = {
"compression-algorithm": self.config["compression"]["algorithm"],
"encryption-key-id": encryption_key_id,
"format": "pghoard-bb-v2",
"original-file-size": input_size,
"host": socket.gethostname(),
}
if extra_metadata:
metadata.update(extra_metadata)
self.transfer_queue.put({
"callback_queue": callback_queue,
"file_size": result_size,
"filetype": filetype,
"local_path": chunk_path,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
})
# Get the name of the chunk and the name of the parent directory (ie backup "name")
chunk_name = "/".join(chunk_path.split("/")[-2:])
return chunk_name, input_size, result_size
def run_local_tar_basebackup(self):
pgdata = self.config["backup_sites"][self.site]["pg_data_directory"]
if not os.path.isdir(pgdata):
raise errors.InvalidConfigurationError("pg_data_directory {!r} does not exist".format(pgdata))
temp_basebackup_dir, compressed_basebackup = self.get_paths_for_backup(self.basebackup_path)
compression_algorithm = self.config["compression"]["algorithm"]
compression_level = self.config["compression"]["level"]
rsa_public_key = None
encryption_key_id = self.config["backup_sites"][self.site]["encryption_key_id"]
if encryption_key_id:
rsa_public_key = self.config["backup_sites"][self.site]["encryption_keys"][encryption_key_id]["public"]
self.log.debug("Connecting to database to start backup process")
connection_string = connection_string_using_pgpass(self.connection_info)
with psycopg2.connect(connection_string) as db_conn:
cursor = db_conn.cursor()
if self.pg_version_server >= 90600:
# We'll always use the the non-exclusive backup mode on 9.6 and newer
cursor.execute("SELECT pg_start_backup(%s, false, false)", [BASEBACKUP_NAME])
backup_label = None
backup_mode = "non-exclusive"
else:
# On older versions, first check if we're in recovery, and find out the version of a possibly
# installed pgespresso extension. We use pgespresso's backup control functions when they're
# available, and require them in case we're running on a replica. We also make sure the
# extension version is 1.2 or newer to prevent crashing when using tablespaces.
cursor.execute("SELECT pg_is_in_recovery(), "
" (SELECT extversion FROM pg_extension WHERE extname = 'pgespresso')")
in_recovery, pgespresso_version = cursor.fetchone()
if in_recovery and (not pgespresso_version or pgespresso_version < "1.2"):
raise errors.InvalidConfigurationError("pgespresso version 1.2 or higher must be installed "
"to take `local-tar` backups from a replica")
if pgespresso_version and pgespresso_version >= "1.2":
cursor.execute("SELECT pgespresso_start_backup(%s, false)", [BASEBACKUP_NAME])
backup_label = cursor.fetchone()[0]
backup_mode = "pgespresso"
else:
cursor.execute("SELECT pg_start_backup(%s)", [BASEBACKUP_NAME])
with open(os.path.join(pgdata, "backup_label"), "r") as fp:
backup_label = fp.read()
backup_mode = "legacy"
backup_stopped = False
try:
# Look up tablespaces and resolve their current filesystem locations
cursor.execute("SELECT oid, spcname FROM pg_tablespace WHERE spcname NOT IN ('pg_default', 'pg_global')")
tablespaces = {
spcname: {
"path": os.readlink(os.path.join(pgdata, "pg_tblspc", str(oid))),
"oid": oid,
}
for oid, spcname in cursor.fetchall()
}
db_conn.commit()
self.log.info("Starting to backup %r to %r", pgdata, compressed_basebackup)
start_time = time.monotonic()
with NamedTemporaryFile(dir=temp_basebackup_dir, prefix="data.", suffix=".tmp-compress") as raw_output_obj:
with rohmufile.file_writer(fileobj=raw_output_obj,
compression_algorithm=compression_algorithm,
compression_level=compression_level,
rsa_public_key=rsa_public_key) as output_obj:
with tarfile.TarFile(fileobj=output_obj, mode="w") as output_tar:
self.write_init_entries_to_tar(pgdata=pgdata, tablespaces=tablespaces, tar=output_tar)
files = self.find_files_to_backup(pgdata=pgdata, tablespaces=tablespaces) # NOTE: generator
self.write_files_to_tar(files=files, tar=output_tar)
self.write_pg_control_to_tar(pgdata=pgdata, tar=output_tar)
# Call the stop backup functions now to get backup label for 9.6+ non-exclusive backups
if backup_mode == "non-exclusive":
cursor.execute("SELECT labelfile FROM pg_stop_backup(false)")
backup_label = cursor.fetchone()[0]
elif backup_mode == "pgespresso":
cursor.execute("SELECT pgespresso_stop_backup(%s)", [backup_label])
else:
cursor.execute("SELECT pg_stop_backup()")
db_conn.commit()
backup_stopped = True
backup_label_data = backup_label.encode("utf-8")
self.write_backup_label_to_tar(tar=output_tar, backup_label=backup_label_data)
input_size = output_obj.tell()
os.link(raw_output_obj.name, compressed_basebackup)
result_size = raw_output_obj.tell()
rohmufile.log_compression_result(
elapsed=time.monotonic() - start_time,
encrypted=True if rsa_public_key else False,
log_func=self.log.info,
original_size=input_size,
result_size=result_size,
source_name=pgdata,
)
finally:
db_conn.rollback()
if not backup_stopped:
if backup_mode == "non-exclusive":
cursor.execute("SELECT pg_stop_backup(false)")
elif backup_mode == "pgespresso":
cursor.execute("SELECT pgespresso_stop_backup(%s)", [backup_label])
else:
cursor.execute("SELECT pg_stop_backup()")
db_conn.commit()
start_wal_segment, backup_start_time = self.parse_backup_label(backup_label_data)
metadata = {
"compression-algorithm": compression_algorithm,
"encryption-key-id": encryption_key_id,
"format": "pghoard-bb-v1",
"original-file-size": input_size,
"pg-version": self.pg_version_server,
"start-time": backup_start_time,
"start-wal-segment": start_wal_segment,
}
for spcname, spcinfo in tablespaces.items():
metadata["tablespace-name-{}".format(spcinfo["oid"])] = spcname
metadata["tablespace-path-{}".format(spcinfo["oid"])] = spcinfo["path"]
self.transfer_queue.put({
"callback_queue": self.callback_queue,
"file_size": result_size,
"filetype": "basebackup",
"local_path": compressed_basebackup,
"metadata": metadata,
"site": self.site,
"type": "UPLOAD",
})