class BICompiler:
def __init__(self, bi_configuration_file, sites_callback: SitesCallback):
self._sites_callback = sites_callback
self._bi_configuration_file = bi_configuration_file
self._logger = logger.getChild("bi.compiler")
self._compiled_aggregations: Dict[str, BICompiledAggregation] = {}
self._path_compilation_lock = Path(get_cache_dir(), "compilation.LOCK")
self._path_compilation_timestamp = Path(get_cache_dir(), "last_compilation")
self._path_compiled_aggregations = Path(get_cache_dir(), "compiled_aggregations")
self._path_compiled_aggregations.mkdir(parents=True, exist_ok=True)
self._redis_client: Optional["RedisDecoded"] = None
self._setup()
def _setup(self):
self._bi_packs = BIAggregationPacks(self._bi_configuration_file)
self._bi_structure_fetcher = BIStructureFetcher(self._sites_callback)
self.bi_searcher = BISearcher()
@property
def compiled_aggregations(self) -> Dict[str, BICompiledAggregation]:
return self._compiled_aggregations
def cleanup(self) -> None:
self._compiled_aggregations.clear()
def load_compiled_aggregations(self) -> None:
try:
self._check_compilation_status()
finally:
self._load_compiled_aggregations()
def _load_compiled_aggregations(self) -> None:
for path_object in self._path_compiled_aggregations.iterdir():
if path_object.is_dir():
continue
aggr_id = path_object.name
if aggr_id.endswith(".new") or aggr_id in self._compiled_aggregations:
continue
self._logger.debug("Loading cached aggregation results %s" % aggr_id)
aggr_data = self._load_data(str(path_object))
self._compiled_aggregations[aggr_id] = BIAggregation.create_trees_from_schema(aggr_data)
def _check_compilation_status(self) -> None:
current_configstatus = self.compute_current_configstatus()
if not self._compilation_required(current_configstatus):
self._logger.debug("No compilation required")
return
with store.locked(self._path_compilation_lock):
# Re-check compilation required after lock has been required
# Another apache might have done the job
current_configstatus = self.compute_current_configstatus()
if not self._compilation_required(current_configstatus):
self._logger.debug("No compilation required. An other process already compiled it")
return
self.prepare_for_compilation(current_configstatus["online_sites"])
# Compile the raw tree
for aggregation in self._bi_packs.get_all_aggregations():
start = time.time()
self._compiled_aggregations[aggregation.id] = aggregation.compile(self.bi_searcher)
self._logger.debug(
"Compilation of %s took %f" % (aggregation.id, time.time() - start)
)
self._verify_aggregation_title_uniqueness(self._compiled_aggregations)
for aggr_id, aggr in self._compiled_aggregations.items():
start = time.time()
result = aggr.serialize()
self._logger.debug(
"Schema dump %s took config took %f (%d branches)"
% (aggr_id, time.time() - start, len(aggr.branches))
)
self._save_data(self._path_compiled_aggregations.joinpath(aggr_id), result)
self._generate_part_of_aggregation_lookup(self._compiled_aggregations)
known_sites = {kv[0]: kv[1] for kv in current_configstatus.get("known_sites", set())}
self._cleanup_vanished_aggregations()
self._bi_structure_fetcher.cleanup_orphaned_files(known_sites)
store.save_text_to_file(
str(self._path_compilation_timestamp), str(current_configstatus["configfile_timestamp"])
)
def _cleanup_vanished_aggregations(self):
valid_aggregations = list(self._compiled_aggregations.keys())
for path_object in self._path_compiled_aggregations.iterdir():
if path_object.is_dir():
continue
if path_object.name not in valid_aggregations:
path_object.unlink(missing_ok=True)
def _verify_aggregation_title_uniqueness(
self, compiled_aggregations: Dict[str, BICompiledAggregation]
) -> None:
used_titles: Dict[str, str] = {}
for aggr_id, bi_aggregation in compiled_aggregations.items():
for bi_branch in bi_aggregation.branches:
branch_title = bi_branch.properties.title
if branch_title in used_titles:
raise MKGeneralException(
_(
'The aggregation titles are not unique. "%s" is created '
"by aggregation <b>%s</b> and <b>%s</b>"
)
% (branch_title, aggr_id, used_titles[branch_title])
)
used_titles[branch_title] = aggr_id
def prepare_for_compilation(self, online_sites: Set[SiteProgramStart]):
self._bi_packs.load_config()
self._bi_structure_fetcher.update_data(online_sites)
self.bi_searcher.set_hosts(self._bi_structure_fetcher.hosts)
def compile_aggregation_result(
self, aggr_id: str, title: str
) -> Optional[BICompiledAggregation]:
"""Allows to compile a single aggregation with a given title. Does not save any results to disk"""
current_configstatus = self.compute_current_configstatus()
self.prepare_for_compilation(current_configstatus["online_sites"])
aggregation = self._bi_packs.get_aggregation(aggr_id)
if not aggregation:
return None
try:
aggregation.node.restrict_rule_title = title
return aggregation.compile(self.bi_searcher)
finally:
aggregation.node.restrict_rule_title = None
def _compilation_required(self, current_configstatus: ConfigStatus) -> bool:
# Check monitoring core changes
if self._site_status_changed(current_configstatus["online_sites"]):
return True
# Check BI configuration changes
if current_configstatus["configfile_timestamp"] > self._get_compilation_timestamp():
return True
return False
def _get_compilation_timestamp(self) -> float:
compilation_timestamp = 0.0
try:
# I prefer Path.read_text
# The corresponding cmk.utils.store has some "this function needs to die!" comment
if self._path_compilation_timestamp.exists():
compilation_timestamp = float(self._path_compilation_timestamp.read_text())
except (FileNotFoundError, ValueError) as e:
self._logger.warning("Can not determine compilation timestamp %s" % str(e))
return compilation_timestamp
def _site_status_changed(self, required_program_starts: Set[SiteProgramStart]) -> bool:
# The cached data may include more data than the currently required_program_starts
# Empty branches are simply not shown during computation
cached_program_starts = self._bi_structure_fetcher.get_cached_program_starts()
return len(required_program_starts - cached_program_starts) > 0
def compute_current_configstatus(self) -> ConfigStatus:
current_configstatus: ConfigStatus = {
"configfile_timestamp": self._get_last_configuration_change(),
"online_sites": set(),
"known_sites": set(),
}
# The get status message also checks if the remote site is still alive
result = self._sites_callback.query("GET status\nColumns: program_start\nCache: reload")
program_start_times = {row[0]: int(row[1]) for row in result}
for site_id, values in self._sites_callback.states().items():
start_time = program_start_times.get(site_id, 0)
current_configstatus["known_sites"].add((site_id, start_time))
if values.get("state") == "online":
current_configstatus["online_sites"].add((site_id, start_time))
return current_configstatus
def _get_last_configuration_change(self) -> float:
conf_dir = cmk.utils.paths.default_config_dir + "/multisite.d"
latest_timestamp = 0.0
wato_config = Path(conf_dir, "wato", self._bi_configuration_file)
if wato_config.exists():
latest_timestamp = max(latest_timestamp, wato_config.stat().st_mtime)
for path_object in Path(conf_dir).iterdir():
if path_object.is_dir():
continue
latest_timestamp = max(latest_timestamp, path_object.stat().st_mtime)
return latest_timestamp
def _save_data(self, filepath: Path, data) -> None:
store.save_bytes_to_file(filepath, pickle.dumps(data))
def _load_data(self, filepath) -> Dict:
return pickle.loads(store.load_bytes_from_file(filepath))
def _get_redis_client(self) -> "RedisDecoded":
if self._redis_client is None:
self._redis_client = get_redis_client()
return self._redis_client
def is_part_of_aggregation(self, host_name, service_description) -> bool:
self._check_redis_lookup_integrity()
return bool(
self._get_redis_client().exists(
"bi:aggregation_lookup:%s:%s" % (host_name, service_description)
)
)
def _check_redis_lookup_integrity(self):
client = self._get_redis_client()
if client.exists("bi:aggregation_lookup"):
return True
# The following scenario only happens if the redis daemon loses its data
# In the normal workflow the lookup cache is updated after the compilation phase
# What happens if multiple apache process want to read the cache at the same time:
# - One apache gets the lock, updates the cache
# - The other apache wait till the cache has been updated
lookup_lock = client.lock("bi:aggregation_lookup_lock")
try:
lookup_lock.acquire()
if not client.exists("bi:aggregation_lookup"):
self.load_compiled_aggregations()
self._generate_part_of_aggregation_lookup(self._compiled_aggregations)
finally:
if lookup_lock.owned():
lookup_lock.release()
def _generate_part_of_aggregation_lookup(self, compiled_aggregations):
part_of_aggregation_map: Dict[str, List[str]] = {}
for aggr_id, compiled_aggregation in compiled_aggregations.items():
for branch in compiled_aggregation.branches:
for _site, host_name, service_description in branch.required_elements():
# This information can be used to selectively load the relevant compiled
# aggregation for any host/service. Right now it is only an indicator if this
# host/service is part of an aggregation
key = "bi:aggregation_lookup:%s:%s" % (host_name, service_description)
part_of_aggregation_map.setdefault(key, []).append(
"%s\t%s" % (aggr_id, branch.properties.title)
)
client = self._get_redis_client()
# The main task here is to add/update/remove keys without causing other processes
# to wait for the updated data. There is no tempfile -> live mechanism.
# Updates are done on the live data via pipeline, using transactions.
# Fetch existing keys
existing_keys = set(client.scan_iter("bi:aggregation_lookup:*"))
# Update keys
pipeline = client.pipeline()
for key, values in part_of_aggregation_map.items():
pipeline.sadd(key, *values)
pipeline.set("bi:aggregation_lookup", "1")
# Remove obsolete keys
obsolete_keys = existing_keys - set(part_of_aggregation_map.keys())
if obsolete_keys:
pipeline.delete(*obsolete_keys)
pipeline.execute()
class BICompiler:
def __init__(self, bi_configuration_file, sites_callback: SitesCallback):
self._sites_callback = sites_callback
self._bi_configuration_file = bi_configuration_file
self._logger = logger.getChild("bi.compiler")
self._compiled_aggregations: Dict[str, BICompiledAggregation] = {}
self._path_compilation_lock = Path(get_cache_dir(), "compilation.LOCK")
self._path_compilation_timestamp = Path(get_cache_dir(), "last_compilation")
self._path_compiled_aggregations = Path(get_cache_dir(), "compiled_aggregations")
self._path_compiled_aggregations.mkdir(parents=True, exist_ok=True)
self._part_of_aggregation_map: Dict[Tuple[HostName, Optional[ServiceName]],
List[Tuple[str, str]]] = {}
self._setup()
def _setup(self):
self._bi_packs = BIAggregationPacks(self._bi_configuration_file)
self._bi_structure_fetcher = BIStructureFetcher(self._sites_callback)
self.bi_searcher = BISearcher()
@property
def compiled_aggregations(self) -> Dict[str, BICompiledAggregation]:
return self._compiled_aggregations
def cleanup(self) -> None:
self._compiled_aggregations.clear()
def load_compiled_aggregations(self) -> None:
try:
self._check_compilation_status()
finally:
self._load_compiled_aggregations()
def _load_compiled_aggregations(self) -> None:
for path_object in self._path_compiled_aggregations.iterdir():
aggr_id = path_object.name
if aggr_id in self._compiled_aggregations:
continue
self._logger.debug("Loading cached aggregation results %s" % aggr_id)
aggr_data = self._marshal_load_data(str(path_object))
self._compiled_aggregations[aggr_id] = BIAggregation.create_trees_from_schema(aggr_data)
self._update_part_of_aggregation_map()
def used_in_aggregation(self, host_name: HostName, service_description: ServiceName) -> bool:
return (host_name, service_description) in self._part_of_aggregation_map
def _update_part_of_aggregation_map(self) -> None:
self._part_of_aggregation_map = {}
for aggr_id, compiled_aggregation in self._compiled_aggregations.items():
for branch in compiled_aggregation.branches:
for _site, host_name, service_description in branch.required_elements():
key = (host_name, service_description)
self._part_of_aggregation_map.setdefault(key, [])
self._part_of_aggregation_map[key].append((aggr_id, branch.properties.title))
def _check_compilation_status(self) -> None:
current_configstatus = self.compute_current_configstatus()
if not self._compilation_required(current_configstatus):
self._logger.debug("No compilation required")
return
with store.locked(self._path_compilation_lock):
# Re-check compilation required after lock has been required
# Another apache might have done the job
current_configstatus = self.compute_current_configstatus()
if not self._compilation_required(current_configstatus):
self._logger.debug("No compilation required. An other process already compiled it")
return
self.prepare_for_compilation(current_configstatus["online_sites"])
# Compile the raw tree
for aggregation in self._bi_packs.get_all_aggregations():
start = time.time()
self._compiled_aggregations[aggregation.id] = aggregation.compile(self.bi_searcher)
self._logger.debug("Compilation of %s took %f" %
(aggregation.id, time.time() - start))
self._verify_aggregation_title_uniqueness(self._compiled_aggregations)
for aggr_id, aggr in self._compiled_aggregations.items():
start = time.time()
result = BICompiledAggregationSchema().dump(aggr)
self._logger.debug("Schema dump took config took %f (%d branches)" %
(time.time() - start, len(aggr.branches)))
start = time.time()
self._marshal_save_data(self._path_compiled_aggregations.joinpath(aggr_id), result)
self._logger.debug("Save dump to disk took %f" % (time.time() - start))
known_sites = {kv[0]: kv[1] for kv in current_configstatus.get("known_sites", set())}
self._bi_structure_fetcher._cleanup_orphaned_files(known_sites)
self._path_compilation_timestamp.write_text(
str(current_configstatus["configfile_timestamp"]))
def _verify_aggregation_title_uniqueness(
self, compiled_aggregations: Dict[str, BICompiledAggregation]) -> None:
used_titles: Dict[str, str] = {}
for aggr_id, bi_aggregation in compiled_aggregations.items():
for bi_branch in bi_aggregation.branches:
branch_title = bi_branch.properties.title
if branch_title in used_titles:
raise MKGeneralException(
_("The aggregation titles are not unique. \"%s\" is created "
"by aggregation <b>%s</b> and <b>%s</b>") %
(branch_title, aggr_id, used_titles[branch_title]))
used_titles[branch_title] = aggr_id
def prepare_for_compilation(self, online_sites: Set[SiteProgramStart]):
self._bi_packs.load_config()
self._bi_structure_fetcher.update_data(online_sites)
self.bi_searcher.set_hosts(self._bi_structure_fetcher.hosts)
def compile_aggregation_result(self, aggr_id: str,
title: str) -> Optional[BICompiledAggregation]:
""" Allows to compile a single aggregation with a given title. Does not save any results to disk """
current_configstatus = self.compute_current_configstatus()
self.prepare_for_compilation(current_configstatus["online_sites"])
aggregation = self._bi_packs.get_aggregation(aggr_id)
if not aggregation:
return None
try:
aggregation.node.restrict_rule_title = title
return aggregation.compile(self.bi_searcher)
finally:
aggregation.node.restrict_rule_title = None
def _compilation_required(self, current_configstatus: ConfigStatus) -> bool:
# Check monitoring core changes
if self._site_status_changed(current_configstatus["online_sites"]):
return True
# Check BI configuration changes
if current_configstatus["configfile_timestamp"] > self._get_compilation_timestamp():
return True
return False
def _get_compilation_timestamp(self) -> float:
compilation_timestamp = 0.0
try:
# I prefer Path.read_text
# The corresponding cmk.utils.store has some "this function needs to die!" comment
if self._path_compilation_timestamp.exists():
compilation_timestamp = float(self._path_compilation_timestamp.read_text())
except (FileNotFoundError, ValueError) as e:
self._logger.warning("Can not determine compilation timestamp %s" % str(e))
return compilation_timestamp
def _site_status_changed(self, required_program_starts: Set[SiteProgramStart]) -> bool:
# The cached data may include more data than the currently required_program_starts
# Empty branches are simply not shown during computation
cached_program_starts = self._bi_structure_fetcher.get_cached_program_starts()
return len(required_program_starts - cached_program_starts) > 0
def compute_current_configstatus(self) -> ConfigStatus:
current_configstatus: ConfigStatus = {
"configfile_timestamp": self._get_last_configuration_change(),
"online_sites": set(),
"known_sites": set(),
}
# The get status message also checks if the remote site is still alive
result = self._sites_callback.query("GET status\nColumns: program_start\nCache: reload")
program_start_times = {row[0]: int(row[1]) for row in result}
for site_id, values in self._sites_callback.states().items():
start_time = program_start_times.get(site_id, 0)
current_configstatus["known_sites"].add((site_id, start_time))
if values.get("state") == "online":
current_configstatus["online_sites"].add((site_id, start_time))
return current_configstatus
def _get_last_configuration_change(self) -> float:
conf_dir = cmk.utils.paths.default_config_dir + "/multisite.d"
latest_timestamp = 0.0
wato_config = Path(conf_dir, "wato", self._bi_configuration_file)
if wato_config.exists():
latest_timestamp = max(latest_timestamp, wato_config.stat().st_mtime)
for path_object in Path(conf_dir).iterdir():
if path_object.is_dir():
continue
latest_timestamp = max(latest_timestamp, path_object.stat().st_mtime)
return latest_timestamp
def _marshal_save_data(self, filepath, data) -> None:
with open(filepath, "wb") as f:
marshal.dump(data, f)
os.fsync(f.fileno())
def _marshal_load_data(self, filepath) -> Dict:
try:
with open(filepath, "rb") as f:
return marshal.load(f)
except ValueError:
return {}