#!/usr/bin/env python # # Azure Linux extension # # Linux Azure Diagnostic Extension (Current version is specified in manifest.xml) # Copyright (c) Microsoft Corporation # All rights reserved. # MIT License # Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated # documentation files (the ""Software""), to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to the following conditions: # The above copyright notice and this permission notice shall be included in all copies or substantial portions of the # Software. # THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS # OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR # OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. import os import traceback import xml.etree.ElementTree as ET import Providers.Builtin as BuiltIn import Utils.ProviderUtil as ProvUtil import Utils.LadDiagnosticUtil as LadUtil import Utils.XmlUtil as XmlUtil import Utils.mdsd_xml_templates as mxt import telegraf_utils.telegraf_config_handler as telhandler import metrics_ext_utils.metrics_constants as metrics_constants import metrics_ext_utils.metrics_ext_handler as me_handler from Utils.lad_exceptions import LadLoggingConfigException, LadPerfCfgConfigException from Utils.lad_logging_config import LadLoggingConfig, copy_source_mdsdevent_eh_url_elems from Utils.misc_helpers import get_storage_endpoints_with_account, escape_nonalphanumerics class LadConfigAll: """ A class to generate configs for all 3 core components of LAD: mdsd, omsagent (fluentd), and syslog (rsyslog or syslog-ng) based on LAD's JSON extension settings. The mdsd XML config file generated will be /var/lib/waagent/Microsoft. ...-x.y.zzzz/xmlCfg.xml (hard-coded). Other config files whose contents are generated by this class are as follows: - /etc/opt/microsoft/omsagent/LAD/conf/omsagent.d/syslog.conf : fluentd's syslog source config - /etc/opt/microsoft/omsagent/LAD/conf/omsagent.d/tail.conf : fluentd's tail source config (fileLogs) - /etc/opt/microsoft/omsagent/LAD/conf/omsagent.d/z_out_mdsd.conf : fluentd's out_mdsd out plugin config - /etc/rsyslog.conf or /etc/rsyslog.d/95-omsagent.conf: rsyslog config for LAD's syslog settings The content should be appended to the corresponding file, not overwritten. After that, the file should be processed so that the '%SYSLOG_PORT%' pattern is replaced with the assigned TCP port number. - /etc/syslog-ng.conf: syslog-ng config for LAD's syslog settings. The content should be appended, not overwritten. """ _default_perf_cfgs = [ {"query": "SELECT PercentAvailableMemory, AvailableMemory, UsedMemory, PercentUsedSwap " "FROM SCX_MemoryStatisticalInformation", "table": "LinuxMemory"}, {"query": "SELECT PercentProcessorTime, PercentIOWaitTime, PercentIdleTime " "FROM SCX_ProcessorStatisticalInformation WHERE Name='_TOTAL'", "table": "LinuxCpu"}, {"query": "SELECT AverageWriteTime,AverageReadTime,ReadBytesPerSecond,WriteBytesPerSecond " "FROM SCX_DiskDriveStatisticalInformation WHERE Name='_TOTAL'", "table": "LinuxDisk"} ] def __init__(self, ext_settings, ext_dir, waagent_dir, deployment_id, fetch_uuid, encrypt_string, logger_log, logger_error): """ Constructor. :param ext_settings: A LadExtSettings (in Utils/lad_ext_settings.py) obj wrapping the Json extension settings. :param ext_dir: Extension directory (e.g., /var/lib/waagent/Microsoft.OSTCExtensions.LinuxDiagnostic-2.3.xxxx) :param waagent_dir: WAAgent directory (e.g., /var/lib/waagent) :param deployment_id: Deployment ID string (or None) that should be obtained & passed by the caller from waagent's HostingEnvironmentCfg.xml. :param fetch_uuid: A function which fetches the UUID for the VM :param encrypt_string: A function which encrypts a string, given a cert_path :param logger_log: Normal logging function (e.g., hutil.log) that takes only one param for the logged msg. :param logger_error: Error logging function (e.g., hutil.error) that takes only one param for the logged msg. """ self._ext_settings = ext_settings self._ext_dir = ext_dir self._waagent_dir = waagent_dir self._deployment_id = deployment_id self._fetch_uuid = fetch_uuid self._encrypt_secret = encrypt_string self._logger_log = logger_log self._logger_error = logger_error self._telegraf_me_url = metrics_constants.lad_metrics_extension_influx_udp_url self._telegraf_mdsd_url = metrics_constants.telegraf_influx_url # Generated logging configs place holders self._fluentd_syslog_src_config = None self._fluentd_tail_src_config = None self._fluentd_out_mdsd_config = None self._rsyslog_config = None self._syslog_ng_config = None self._telegraf_config = None self._telegraf_namespaces = None self._mdsd_config_xml_tree = ET.ElementTree(ET.fromstring(mxt.entire_xml_cfg_tmpl)) self._sink_configs = LadUtil.SinkConfiguration() self._sink_configs.insert_from_config(self._ext_settings.read_protected_config('sinksConfig')) # Reading the AzMonSink info from the public config. self._sink_configs_public = LadUtil.SinkConfiguration() self._sink_configs_public.insert_from_config(self._ext_settings.read_public_config('sinksConfig')) # If we decide to also read sinksConfig from ladCfg, do it first, so that private settings override # Get encryption settings handlerSettings = ext_settings.get_handler_settings() if handlerSettings['protectedSettings'] is None: errorMsg = "Settings did not contain protectedSettings. For information on protected settings, " \ "visit https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/diagnostics-linux#protected-settings." self._logger_error(errorMsg) raise LadLoggingConfigException(errorMsg) if handlerSettings['protectedSettingsCertThumbprint'] is None: errorMsg = "Settings did not contain protectedSettingsCertThumbprint. For information on protected settings, " \ "visit https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/diagnostics-linux#protected-settings." self._logger_error(errorMsg) raise LadLoggingConfigException(errorMsg) thumbprint = handlerSettings['protectedSettingsCertThumbprint'] self._cert_path = os.path.join(waagent_dir, thumbprint + '.crt') self._pkey_path = os.path.join(waagent_dir, thumbprint + '.prv') def _ladCfg(self): return self._ext_settings.read_public_config('ladCfg') @staticmethod def _wad_table_name(interval): """ Build the name and storetype of a metrics table based on the aggregation interval and presence/absence of sinks :param str interval: String representation of aggregation interval :return: table name :rtype: str """ return 'WADMetrics{0}P10DV2S'.format(interval) def _add_element_from_string(self, path, xml_string, add_only_once=True): """ Add an XML fragment to the mdsd config document in accordance with path :param str path: Where to add the fragment :param str xml_string: A string containing the XML element to add :param bool add_only_once: Indicates whether to perform the addition only to the first match of the path. """ XmlUtil.addElement(xml=self._mdsd_config_xml_tree, path=path, el=ET.fromstring(xml_string), addOnlyOnce=add_only_once) def _add_element_from_element(self, path, xml_elem, add_only_once=True): """ Add an XML fragment to the mdsd config document in accordance with path :param str path: Where to add the fragment :param ElementTree xml_elem: An ElementTree object XML fragment that should be added to the path. :param bool add_only_once: Indicates whether to perform the addition only to the first match of the path. """ XmlUtil.addElement(xml=self._mdsd_config_xml_tree, path=path, el=xml_elem, addOnlyOnce=add_only_once) def _add_derived_event(self, interval, source, event_name, store_type, add_lad_query=False): """ Add a element to the configuration :param str interval: Interval at which this DerivedEvent should be run :param str source: Local table from which this DerivedEvent should pull :param str event_name: Destination table to which this DerivedEvent should push :param str store_type: The storage type of the destination table, e.g. Local, Central, JsonBlob :param bool add_lad_query: True if a subelement should be added to this element """ derived_event = mxt.derived_event.format(interval=interval, source=source, target=event_name, type=store_type) element = ET.fromstring(derived_event) if add_lad_query: XmlUtil.addElement(element, ".", ET.fromstring(mxt.lad_query)) self._add_element_from_element('Events/DerivedEvents', element) def _add_obo_field(self, name, value): """ Add an element to the element. :param name: Name of the field :param value: Value for the field """ self._add_element_from_string('Management', mxt.obo_field.format(name=name, value=value)) def _update_metric_collection_settings(self, ladCfg, namespaces): """ Update mdsd_config_xml_tree for Azure Portal metric collection. This method builds the necessary aggregation queries that grind the ingested data and push it to the WADmetric table. :param ladCfg: ladCfg object from extension config :param namespaces: list of telegraf plugins sources obtained after parsing lad metrics config :return: None """ # Aggregation is done by within a . If there are no alternate sinks, the DerivedQuery # can send output directly to the WAD metrics table. If there *are* alternate sinks, have the LADQuery send # output to a new local table, then arrange for additional derived queries to pull from that. intervals = LadUtil.getAggregationPeriodsFromLadCfg(ladCfg) sinks = LadUtil.getFeatureWideSinksFromLadCfg(ladCfg, 'performanceCounters') for plugin in namespaces: lad_specific_storage_plugin = "storage-" + plugin for aggregation_interval in intervals: if sinks: local_table_name = ProvUtil.MakeUniqueEventName('aggregationLocal') self._add_derived_event(aggregation_interval, lad_specific_storage_plugin, local_table_name, 'Local', add_lad_query=True) self._handle_alternate_sinks(aggregation_interval, sinks, local_table_name) else: self._add_derived_event(aggregation_interval, lad_specific_storage_plugin, LadConfigAll._wad_table_name(aggregation_interval), 'Central', add_lad_query=True) def _handle_alternate_sinks(self, interval, sinks, source): """ Update the XML config to accommodate alternate data sinks. Start by pumping the data from the local source to the actual wad table; then run through the sinks and add annotations or additional DerivedEvents as needed. :param str interval: Aggregation interval :param [str] sinks: List of alternate destinations :param str source: Name of local table from which data is to be pumped :return: """ self._add_derived_event(interval, source, LadConfigAll._wad_table_name(interval), 'Central') for name in sinks: sink = self._sink_configs.get_sink_by_name(name) if sink is None: self._logger_log("Ignoring sink '{0}' for which no definition was found".format(name)) elif sink['type'] == 'EventHub': if 'sasURL' in sink: self._add_streaming_annotation(source, sink['sasURL']) else: self._logger_error("Ignoring EventHub sink '{0}': no 'sasURL' was supplied".format(name)) elif sink['type'] == 'JsonBlob': self._add_derived_event(interval, source, name, 'JsonBlob') else: self._logger_log("Ignoring sink '{0}': unknown type '{1}'".format(name, sink['type'])) def _add_streaming_annotation(self, sink_name, sas_url): """ Helper to add an EventStreamingAnnotation element for the given sink_name and sas_url :param str sink_name: Name of the EventHub sink name for the SAS URL :param str sas_url: Raw SAS URL string for the EventHub sink """ self._add_element_from_string('EventStreamingAnnotations', mxt.per_eh_url_tmpl.format(eh_name=sink_name, key_path=self._pkey_path, enc_eh_url=self._encrypt_secret_with_cert(sas_url))) def _encrypt_secret_with_cert(self, secret): """ update_account_settings() helper. :param secret: Secret to encrypt :return: Encrypted secret string. None if openssl command exec fails. """ return self._encrypt_secret(self._cert_path, secret) def _update_account_settings(self, account, token, endpoints): """ Update the MDSD configuration Account element with Azure table storage properties. Exactly one of (key, token) must be provided. :param account: Storage account to which LAD should write data :param token: SAS token to access the storage account :param endpoints: Identifies the Azure storage endpoints (public or specific sovereign cloud) where the storage account is """ assert token, "Token must be given." assert self._mdsd_config_xml_tree is not None token = self._encrypt_secret_with_cert(token) assert token, "Could not encrypt token" XmlUtil.setXmlValue(self._mdsd_config_xml_tree, 'Accounts/SharedAccessSignature', "account", account, ['isDefault', 'true']) XmlUtil.setXmlValue(self._mdsd_config_xml_tree, 'Accounts/SharedAccessSignature', "key", token, ['isDefault', 'true']) XmlUtil.setXmlValue(self._mdsd_config_xml_tree, 'Accounts/SharedAccessSignature', "decryptKeyPath", self._pkey_path, ['isDefault', 'true']) XmlUtil.setXmlValue(self._mdsd_config_xml_tree, 'Accounts/SharedAccessSignature', "tableEndpoint", endpoints[0], ['isDefault', 'true']) XmlUtil.setXmlValue(self._mdsd_config_xml_tree, 'Accounts/SharedAccessSignature', "blobEndpoint", endpoints[1], ['isDefault', 'true']) XmlUtil.removeElement(self._mdsd_config_xml_tree, 'Accounts', 'Account') def _set_xml_attr(self, key, value, xml_path, selector=[]): """ Set XML attribute on the element specified with xml_path. :param key: The attribute name to set on the XML element. :param value: The default value to be set, if there's no public config for that attribute. :param xml_path: The path of the XML element(s) to which the attribute is applied. :param selector: Selector for finding the actual XML element (see XmlUtil.setXmlValue) :return: None. Change is directly applied to mdsd_config_xml_tree XML member object. """ assert self._mdsd_config_xml_tree is not None v = self._ext_settings.read_public_config(key) if not v: v = value XmlUtil.setXmlValue(self._mdsd_config_xml_tree, xml_path, key, v, selector) def _set_event_volume(self, lad_cfg): """ Set event volume in mdsd config. Check if desired event volume is specified, first in ladCfg then in public config. If in neither then default to Medium. :param lad_cfg: 'ladCfg' Json object to look up for the event volume setting. :return: None. The mdsd config XML tree's eventVolume attribute is directly updated. :rtype: str """ assert self._mdsd_config_xml_tree is not None event_volume = LadUtil.getEventVolumeFromLadCfg(lad_cfg) if event_volume: self._logger_log("Event volume found in ladCfg: " + event_volume) else: event_volume = self._ext_settings.read_public_config("eventVolume") if event_volume: self._logger_log("Event volume found in public config: " + event_volume) else: event_volume = "Medium" self._logger_log("Event volume not found in config. Using default value: " + event_volume) XmlUtil.setXmlValue(self._mdsd_config_xml_tree, "Management", "eventVolume", event_volume) ###################################################################### # This is the main API that's called by user. All other methods are # actually helpers for this, thus made private by convention. ###################################################################### def generate_all_configs(self): """ Generates configs for all components required by LAD. Generates XML cfg file for mdsd, from JSON config settings (public & private). Also generates rsyslog/syslog-ng configs corresponding to 'syslogEvents' or 'syslogCfg' setting. Also generates fluentd's syslog/tail src configs and out_mdsd configs. The rsyslog/syslog-ng and fluentd configs are not yet saved to files. They are available through the corresponding getter methods of this class (get_fluentd_*_config(), get_*syslog*_config()). Returns (True, '') if config was valid and proper xmlCfg.xml was generated. Returns (False, '...') if config was invalid and the error message. """ # 1. Add DeploymentId (if available) to identity columns if self._deployment_id: XmlUtil.setXmlValue(self._mdsd_config_xml_tree, "Management/Identity/IdentityComponent", "", self._deployment_id, ["name", "DeploymentId"]) # 2. Generate telegraf, MetricsExtension, omsagent (fluentd) configs, rsyslog/syslog-ng config, and update corresponding mdsd config XML try: lad_cfg = self._ladCfg() if not lad_cfg: return False, 'Unable to find Ladcfg element. Failed to generate configs for fluentd, syslog, and mdsd ' \ '(see extension error logs for more details)' syslogEvents_setting = self._ext_settings.get_syslogEvents_setting() fileLogs_setting = self._ext_settings.get_fileLogs_setting() lad_logging_config_helper = LadLoggingConfig(syslogEvents_setting, fileLogs_setting, self._sink_configs, self._pkey_path, self._cert_path, self._encrypt_secret) mdsd_syslog_config = lad_logging_config_helper.get_mdsd_syslog_config(self._ext_settings.read_protected_config('disableStorageAccount') == True) mdsd_filelog_config = lad_logging_config_helper.get_mdsd_filelog_config() copy_source_mdsdevent_eh_url_elems(self._mdsd_config_xml_tree, mdsd_syslog_config) copy_source_mdsdevent_eh_url_elems(self._mdsd_config_xml_tree, mdsd_filelog_config) self._fluentd_syslog_src_config = lad_logging_config_helper.get_fluentd_syslog_src_config() self._fluentd_tail_src_config = lad_logging_config_helper.get_fluentd_filelog_src_config() self._fluentd_out_mdsd_config = lad_logging_config_helper.get_fluentd_out_mdsd_config() self._rsyslog_config = lad_logging_config_helper.get_rsyslog_config() self._syslog_ng_config = lad_logging_config_helper.get_syslog_ng_config() parsed_perf_settings = lad_logging_config_helper.parse_lad_perf_settings(lad_cfg) if len(parsed_perf_settings) > 0: self._telegraf_config, self._telegraf_namespaces = telhandler.handle_config(parsed_perf_settings, self._telegraf_me_url, self._telegraf_mdsd_url, True) #Handle the EH, JsonBlob and AzMonSink logic self._update_metric_collection_settings(lad_cfg, self._telegraf_namespaces) mdsd_telegraf_config = lad_logging_config_helper.get_mdsd_telegraf_config(self._telegraf_namespaces) copy_source_mdsdevent_eh_url_elems(self._mdsd_config_xml_tree, mdsd_telegraf_config) resource_id = self._ext_settings.get_resource_id() if resource_id: # Set JsonBlob sink-related elements uuid_for_instance_id = self._fetch_uuid() self._add_obo_field(name='resourceId', value=resource_id) self._add_obo_field(name='agentIdentityHash', value=uuid_for_instance_id) XmlUtil.setXmlValue(self._mdsd_config_xml_tree, 'Events/DerivedEvents/DerivedEvent/LADQuery', 'partitionKey', escape_nonalphanumerics(resource_id)) lad_query_instance_id = "" if resource_id.find("providers/Microsoft.Compute/virtualMachineScaleSets") >= 0: lad_query_instance_id = uuid_for_instance_id self._set_xml_attr("instanceID", lad_query_instance_id, "Events/DerivedEvents/DerivedEvent/LADQuery") else: self._logger_log('Unable to find resource id in the config. Failed to generate configs for Metrics in mdsd ' \ '(see extension error logs for more details)') #Only enable Metrics if AzMonSink is in the config azmonsink = self._sink_configs_public.get_sink_by_name("AzMonSink") if azmonsink is None: self._logger_log("Did not find AzMonSink in public config. Will not set up custom metrics through ME.") else: self._logger_log("Found AzMonSink in public config. Setting up custom metrics through ME.") me_handler.setup_me(True) except Exception as e: self._logger_error("Failed to create omsagent (fluentd), rsyslog/syslog-ng configs, telegraf config or to update " "corresponding mdsd config XML. Error: {0}\nStacktrace: {1}" .format(e, traceback.format_exc())) return False, 'Failed to generate configs for fluentd, syslog, and mdsd; see extension.log for more details.' # 3. Before starting to update the storage account settings, log extension's entire settings # with secrets redacted, for diagnostic purpose. self._ext_settings.log_ext_settings_with_secrets_redacted(self._logger_log, self._logger_error) # 4. Actually update the storage account settings on mdsd config XML tree (based on extension's # protectedSettings). account = self._ext_settings.read_protected_config('storageAccountName').strip() if not account: return False, "Configuration Error: Must specify storageAccountName in protected settings. For information on protected settings, " \ "visit https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/diagnostics-linux#protected-settings." if self._ext_settings.read_protected_config('storageAccountKey'): return False, "Configuration Error: The storageAccountKey protected setting is deprecated in LAD 3.0 and cannot be used. " \ "Instead, use the storageAccountSasToken setting. For documentation of this setting and instructions for generating " \ "a SAS token, visit https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/diagnostics-linux#protected-settings." token = self._ext_settings.read_protected_config('storageAccountSasToken').strip() if not token or token == '?': return False, "Configuration Error: Must specify storageAccountSasToken in the protected settings. For documentation of this setting and instructions " \ "for generating a SAS token, visit https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/diagnostics-linux#protected-settings." if '?' == token[0]: token = token[1:] endpoints = get_storage_endpoints_with_account(account, self._ext_settings.read_protected_config('storageAccountEndPoint')) self._update_account_settings(account, token, endpoints) # 5. Update mdsd config XML's eventVolume attribute based on the logic specified in the helper. self._set_event_volume(lad_cfg) # 6. Finally generate mdsd config XML file out of the constructed XML tree object. self._mdsd_config_xml_tree.write(os.path.join(self._ext_dir, 'xmlCfg.xml')) return True, "" @staticmethod def __throw_if_output_is_none(output): """ Helper to check if output is already generated (not None) and throw if it's not (None). :return: None """ if output is None: raise LadLoggingConfigException('LadConfigAll.get_*_config() should be called after ' 'LadConfigAll.generate_mdsd_omsagent_syslog_config() is called') def get_fluentd_syslog_src_config(self): """ Returns the obtained Fluentd's syslog src config. This getter (and all that follow) should be called after self.generate_mdsd_omsagent_syslog_config() is called. The return value should be overwritten to /etc/opt/microsoft/omsagent/LAD/conf/omsagent.d/syslog.conf after replacing '%SYSLOG_PORT%' with the assigned TCP port number. :rtype: str :return: Fluentd syslog src config string """ LadConfigAll.__throw_if_output_is_none(self._fluentd_syslog_src_config) return self._fluentd_syslog_src_config def get_fluentd_tail_src_config(self): """ Returns the obtained Fluentd's tail src config. This getter (and all that follow) should be called after self.generate_mdsd_omsagent_syslog_config() is called. The return value should be overwritten to /etc/opt/microsoft/omsagent/LAD/conf/omsagent.d/tail.conf. :rtype: str :return: Fluentd tail src config string """ LadConfigAll.__throw_if_output_is_none(self._fluentd_tail_src_config) return self._fluentd_tail_src_config def get_fluentd_out_mdsd_config(self): """_fluentd_out_mdsd_config Returns the obtained Fluentd's out_mdsd config. This getter (and all that follow) should be called after self.generate_mdsd_omsagent_syslog_config() is called. The return value should be overwritten to /etc/opt/microsoft/omsagent/LAD/conf/omsagent.d/z_out_mdsd.conf. :rtype: str :return: Fluentd out_mdsd config string """ LadConfigAll.__throw_if_output_is_none(self._fluentd_out_mdsd_config) return self._fluentd_out_mdsd_config def get_rsyslog_config(self): """ Returns the obtained rsyslog config. This getter (and all that follow) should be called after self.generate_mdsd_omsagent_syslog_config() is called. The return value should be appended to /etc/rsyslog.d/95-omsagent.conf if rsyslog ver is new (that is, if /etc/rsyslog.d/ exists). It should be appended to /etc/rsyslog.conf if rsyslog ver is old (no /etc/rsyslog.d/). The appended file (either /etc/rsyslog.d/95-omsagent.conf or /etc/rsyslog.conf) should be processed so that the '%SYSLOG_PORT%' pattern in the file is replaced with the assigned TCP port number. :rtype: str :return: rsyslog config string """ LadConfigAll.__throw_if_output_is_none(self._rsyslog_config) return self._rsyslog_config def get_syslog_ng_config(self): """ Returns the obtained syslog-ng config. This getter (and all that follow) should be called after self.generate_mdsd_omsagent_syslog_config() is called. The return value should be appended to /etc/syslog-ng.conf. The appended file (/etc/syslog-ng.conf) should be processed so that the '%SYSLOG_PORT%' pattern in the file is replaced with the assigned TCP port number. :rtype: str :return: syslog-ng config string """ LadConfigAll.__throw_if_output_is_none(self._syslog_ng_config) return self._syslog_ng_config