def delete_remote_basebackup(self, site, basebackup, metadata):
start_time = time.monotonic()
storage = self.site_transfers.get(site)
main_backup_key = os.path.join(self.config["backup_sites"][site]["prefix"], "basebackup", basebackup)
basebackup_data_files = [main_backup_key]
if metadata.get("format") == "pghoard-bb-v2":
bmeta_compressed = storage.get_contents_to_string(main_backup_key)[0]
with rohmufile.file_reader(fileobj=io.BytesIO(bmeta_compressed), metadata=metadata,
key_lookup=config.key_lookup_for_site(self.config, site)) as input_obj:
bmeta = extract_pghoard_bb_v2_metadata(input_obj)
self.log.debug("PGHoard chunk metadata: %r", bmeta)
for chunk in bmeta["chunks"]:
basebackup_data_files.append(os.path.join(
self.config["backup_sites"][site]["prefix"],
"basebackup_chunk",
chunk["chunk_filename"],
))
self.log.debug("Deleting basebackup datafiles: %r", ', '.join(basebackup_data_files))
for obj_key in basebackup_data_files:
try:
storage.delete_key(obj_key)
except FileNotFoundFromStorageError:
self.log.info("Tried to delete non-existent basebackup %r", obj_key)
except Exception as ex: # FIXME: don't catch all exceptions; pylint: disable=broad-except
self.log.exception("Problem deleting: %r", obj_key)
self.metrics.unexpected_exception(ex, where="delete_remote_basebackup")
self.log.info("Deleted basebackup datafiles: %r, took: %.2fs",
', '.join(basebackup_data_files), time.monotonic() - start_time)
def delete_remote_basebackup(self, site, basebackup, metadata):
start_time = time.monotonic()
storage = self.site_transfers.get(site)
main_backup_key = os.path.join(self.config["backup_sites"][site]["prefix"], "basebackup", basebackup)
basebackup_data_files = [main_backup_key]
if metadata.get("format") == "pghoard-bb-v2":
bmeta_compressed = storage.get_contents_to_string(main_backup_key)[0]
with rohmufile.file_reader(fileobj=io.BytesIO(bmeta_compressed), metadata=metadata,
key_lookup=config.key_lookup_for_site(self.config, site)) as input_obj:
bmeta = extract_pghoard_bb_v2_metadata(input_obj)
self.log.debug("PGHoard chunk metadata: %r", bmeta)
for chunk in bmeta["chunks"]:
basebackup_data_files.append(os.path.join(
self.config["backup_sites"][site]["prefix"],
"basebackup_chunk",
chunk["chunk_filename"],
))
self.log.debug("Deleting basebackup datafiles: %r", ', '.join(basebackup_data_files))
for obj_key in basebackup_data_files:
try:
storage.delete_key(obj_key)
except FileNotFoundFromStorageError:
self.log.info("Tried to delete non-existent basebackup %r", obj_key)
except Exception as ex: # FIXME: don't catch all exceptions; pylint: disable=broad-except
self.log.exception("Problem deleting: %r", obj_key)
self.metrics.unexpected_exception(ex, where="delete_remote_basebackup")
self.log.info("Deleted basebackup datafiles: %r, took: %.2fs",
', '.join(basebackup_data_files), time.monotonic() - start_time)
def handle_decompression_event(self, event):
with open(event["local_path"], "wb") as output_obj:
rohmufile.read_file(
input_obj=BytesIO(event["blob"]),
output_obj=output_obj,
metadata=event.get("metadata"),
key_lookup=config.key_lookup_for_site(self.config, event["site"]),
log_func=self.log.debug,
)
if "callback_queue" in event:
event["callback_queue"].put({"success": True, "opaque": event.get("opaque")})
def handle_decompression_event(self, event):
with open(event["local_path"], "wb") as output_obj:
rohmufile.read_file(
input_obj=BytesIO(event["blob"]),
output_obj=output_obj,
metadata=event.get("metadata"),
key_lookup=config.key_lookup_for_site(self.config, event["site"]),
log_func=self.log.debug,
)
if "callback_queue" in event:
event["callback_queue"].put({"success": True, "opaque": event.get("opaque")})
def fetch(self, site, key, target_path):
try:
lookup = key_lookup_for_site(self.config, site)
data, metadata = self.transfer.get_contents_to_string(key)
if isinstance(data, str):
data = data.encode("latin1")
file_size = len(data)
with open(target_path, "wb") as target_file:
output = create_sink_pipeline(
output=target_file, file_size=file_size, metadata=metadata, key_lookup=lookup, throttle_time=0)
output.write(data)
return file_size, metadata
except Exception:
if os.path.isfile(target_path):
os.unlink(target_path)
raise
def fetch(self, site, key, target_path):
try:
lookup = key_lookup_for_site(self.config, site)
data, metadata = self.transfer.get_contents_to_string(key)
if isinstance(data, str):
data = data.encode("latin1")
file_size = len(data)
with open(target_path, "wb") as target_file:
output = create_sink_pipeline(
output=target_file, file_size=file_size, metadata=metadata, key_lookup=lookup, throttle_time=0
)
output.write(data)
return file_size, metadata
except Exception:
if os.path.isfile(target_path):
os.unlink(target_path)
raise
def _get_delta_basebackup_files(self, site, storage, metadata,
basebackup_name_to_delete,
backups_to_keep):
all_hexdigests = set()
keep_hexdigests = set()
basebackup_data_files = list()
for backup_name in [basebackup_name_to_delete
] + [back["name"] for back in backups_to_keep]:
delta_backup_key = os.path.join(self._get_site_prefix(site),
"basebackup", backup_name)
bmeta_compressed = storage.get_contents_to_string(
delta_backup_key)[0]
with rohmufile.file_reader(fileobj=io.BytesIO(bmeta_compressed),
metadata=metadata,
key_lookup=config.key_lookup_for_site(
self.config, site)) as input_obj:
meta = extract_pghoard_delta_v1_metadata(input_obj)
manifest = meta["manifest"]
snapshot_result = manifest["snapshot_result"]
backup_state = snapshot_result["state"]
files = backup_state["files"]
backup_hexdigests = set(delta_file["hexdigest"]
for delta_file in files
if delta_file["hexdigest"])
all_hexdigests |= backup_hexdigests
if backup_name != basebackup_name_to_delete:
# Keep data file in case if there is still a reference from other backups
keep_hexdigests |= backup_hexdigests
# Remove unreferenced files
extra_hexdigests = set(all_hexdigests).difference(keep_hexdigests)
for hexdigest in extra_hexdigests:
basebackup_data_files.append(
os.path.join(self._get_site_prefix(site), "basebackup_delta",
hexdigest))
return basebackup_data_files
def _get_basebackup(self, pgdata, basebackup, site,
primary_conninfo=None,
recovery_end_command=None,
recovery_target_action=None,
recovery_target_name=None,
recovery_target_time=None,
recovery_target_xid=None,
restore_to_master=None,
overwrite=False,
tablespace_mapping=None):
targets = [recovery_target_name, recovery_target_time, recovery_target_xid]
if sum(0 if flag is None else 1 for flag in targets) > 1:
raise RestoreError("Specify at most one of recovery_target_name, "
"recovery_target_time or recovery_target_xid")
# If basebackup that we want it set as latest, figure out which one it is
if recovery_target_time:
try:
recovery_target_time = dateutil.parser.parse(recovery_target_time)
except (TypeError, ValueError) as ex:
raise RestoreError("recovery_target_time {!r}: {}".format(recovery_target_time, ex))
basebackup = self._find_nearest_basebackup(recovery_target_time)
elif basebackup == "latest":
basebackup = self._find_nearest_basebackup()
# Grab basebackup metadata to make sure it exists and to look up tablespace requirements
metadata = self.storage.get_basebackup_metadata(basebackup)
# Make sure we have a proper place to write the $PGDATA and possible tablespaces
dirs_to_create = []
dirs_to_recheck = []
dirs_to_wipe = []
if not os.path.exists(pgdata):
dirs_to_create.append(pgdata)
elif overwrite:
dirs_to_create.append(pgdata)
dirs_to_wipe.append(pgdata)
elif os.listdir(pgdata) in ([], ["lost+found"]):
# Allow empty directories as well as ext3/4 mount points to be used, but check that we can write to them
dirs_to_recheck.append(["$PGDATA", pgdata])
else:
raise RestoreError("$PGDATA target directory {!r} exists, is not empty and --overwrite not specified, aborting."
.format(pgdata))
tablespaces = {}
tsmetare = re.compile("^tablespace-name-([0-9]+)$")
for kw, value in metadata.items():
match = tsmetare.match(kw)
if not match:
continue
tsoid = match.group(1)
tsname = value
tspath = tablespace_mapping.pop(tsname, metadata["tablespace-path-{}".format(tsoid)])
if not os.path.exists(tspath):
raise RestoreError("Tablespace {!r} target directory {!r} does not exist, aborting."
.format(tsname, tspath))
if os.listdir(tspath) not in ([], ["lost+found"]):
# Allow empty directories as well as ext3/4 mount points to be used, but check that we can write to them
raise RestoreError("Tablespace {!r} target directory {!r} exists but is not empty, aborting."
.format(tsname, tspath))
print("Using existing empty directory {!r} for tablespace {!r}".format(tspath, tsname))
tablespaces[tsname] = {
"oid": int(tsoid),
"path": tspath,
}
dirs_to_recheck.append(["Tablespace {!r}".format(tsname), tspath])
# We .pop() the elements of tablespace_mapping above - if mappings are given they must all exist or the
# user probably made a typo with tablespace names, abort in that case.
if tablespace_mapping:
raise RestoreError("Tablespace mapping for {} was requested, but the tablespaces are not present in the backup"
.format(sorted(tablespace_mapping)))
# First check that the existing (empty) directories are writable, then possibly wipe any directories as
# requested by --overwrite and finally create the new dirs
for diruse, dirname in dirs_to_recheck:
try:
tempfile.TemporaryFile(dir=dirname).close()
except PermissionError:
raise RestoreError("{} target directory {!r} is empty, but not writable, aborting."
.format(diruse, dirname))
for dirname in dirs_to_wipe:
shutil.rmtree(dirname)
for dirname in dirs_to_create:
os.makedirs(dirname)
os.chmod(dirname, 0o700)
with tempfile.TemporaryFile(dir=self.config["backup_location"], prefix="basebackup.", suffix=".pghoard") as tmp:
self.storage.get_basebackup_file_to_fileobj(basebackup, tmp)
tmp.seek(0)
with rohmufile.file_reader(fileobj=tmp, metadata=metadata,
key_lookup=config.key_lookup_for_site(self.config, site)) as input_obj:
if metadata.get("format") == "pghoard-bb-v1":
self._extract_pghoard_bb_v1(input_obj, pgdata, tablespaces)
else:
self._extract_basic(input_obj, pgdata)
create_recovery_conf(
dirpath=pgdata,
site=site,
port=self.config["http_port"],
primary_conninfo=primary_conninfo,
recovery_end_command=recovery_end_command,
recovery_target_action=recovery_target_action,
recovery_target_name=recovery_target_name,
recovery_target_time=recovery_target_time,
recovery_target_xid=recovery_target_xid,
restore_to_master=restore_to_master,
)
print("Basebackup restoration complete.")
print("You can start PostgreSQL by running pg_ctl -D %s start" % pgdata)
print("On systemd based systems you can run systemctl start postgresql")
print("On SYSV Init based systems you can run /etc/init.d/postgresql start")
