1 /*
2 // Copyright (c) 2020 Intel Corporation
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //      http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 */
16 #pragma once
17 #include "metric_report.hpp"
18 #include "registries.hpp"
19 #include "registries/base_message_registry.hpp"
20 #include "registries/openbmc_message_registry.hpp"
21 #include "registries/task_event_message_registry.hpp"
22 
23 #include <sys/inotify.h>
24 
25 #include <boost/algorithm/string/classification.hpp>
26 #include <boost/algorithm/string/split.hpp>
27 #include <boost/asio/io_context.hpp>
28 #include <boost/container/flat_map.hpp>
29 #include <dbus_utility.hpp>
30 #include <error_messages.hpp>
31 #include <event_service_store.hpp>
32 #include <http/utility.hpp>
33 #include <http_client.hpp>
34 #include <persistent_data.hpp>
35 #include <random.hpp>
36 #include <sdbusplus/bus/match.hpp>
37 #include <server_sent_events.hpp>
38 #include <utils/json_utils.hpp>
39 
40 #include <cstdlib>
41 #include <ctime>
42 #include <fstream>
43 #include <memory>
44 #include <span>
45 
46 namespace redfish
47 {
48 
49 using ReadingsObjType =
50     std::vector<std::tuple<std::string, std::string, double, int32_t>>;
51 
52 static constexpr const char* eventFormatType = "Event";
53 static constexpr const char* metricReportFormatType = "MetricReport";
54 
55 static constexpr const char* eventServiceFile =
56     "/var/lib/bmcweb/eventservice_config.json";
57 
58 namespace registries
59 {
60 inline std::span<const MessageEntry>
61     getRegistryFromPrefix(const std::string& registryName)
62 {
63     if (task_event::header.registryPrefix == registryName)
64     {
65         return {task_event::registry};
66     }
67     if (openbmc::header.registryPrefix == registryName)
68     {
69         return {openbmc::registry};
70     }
71     if (base::header.registryPrefix == registryName)
72     {
73         return {base::registry};
74     }
75     return {openbmc::registry};
76 }
77 } // namespace registries
78 
79 #ifndef BMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES
80 static std::optional<boost::asio::posix::stream_descriptor> inotifyConn;
81 static constexpr const char* redfishEventLogDir = "/var/log";
82 static constexpr const char* redfishEventLogFile = "/var/log/redfish";
83 static constexpr const size_t iEventSize = sizeof(inotify_event);
84 static int inotifyFd = -1;
85 static int dirWatchDesc = -1;
86 static int fileWatchDesc = -1;
87 
88 // <ID, timestamp, RedfishLogId, registryPrefix, MessageId, MessageArgs>
89 using EventLogObjectsType =
90     std::tuple<std::string, std::string, std::string, std::string, std::string,
91                std::vector<std::string>>;
92 
93 namespace registries
94 {
95 static const Message*
96     getMsgFromRegistry(const std::string& messageKey,
97                        const std::span<const MessageEntry>& registry)
98 {
99     std::span<const MessageEntry>::iterator messageIt =
100         std::find_if(registry.begin(), registry.end(),
101                      [&messageKey](const MessageEntry& messageEntry) {
102         return messageKey == messageEntry.first;
103         });
104     if (messageIt != registry.end())
105     {
106         return &messageIt->second;
107     }
108 
109     return nullptr;
110 }
111 
112 static const Message* formatMessage(const std::string_view& messageID)
113 {
114     // Redfish MessageIds are in the form
115     // RegistryName.MajorVersion.MinorVersion.MessageKey, so parse it to find
116     // the right Message
117     std::vector<std::string> fields;
118     fields.reserve(4);
119     boost::split(fields, messageID, boost::is_any_of("."));
120     if (fields.size() != 4)
121     {
122         return nullptr;
123     }
124     const std::string& registryName = fields[0];
125     const std::string& messageKey = fields[3];
126 
127     // Find the right registry and check it for the MessageKey
128     return getMsgFromRegistry(messageKey, getRegistryFromPrefix(registryName));
129 }
130 } // namespace registries
131 
132 namespace event_log
133 {
134 inline bool getUniqueEntryID(const std::string& logEntry, std::string& entryID)
135 {
136     static time_t prevTs = 0;
137     static int index = 0;
138 
139     // Get the entry timestamp
140     std::time_t curTs = 0;
141     std::tm timeStruct = {};
142     std::istringstream entryStream(logEntry);
143     if (entryStream >> std::get_time(&timeStruct, "%Y-%m-%dT%H:%M:%S"))
144     {
145         curTs = std::mktime(&timeStruct);
146         if (curTs == -1)
147         {
148             return false;
149         }
150     }
151     // If the timestamp isn't unique, increment the index
152     index = (curTs == prevTs) ? index + 1 : 0;
153 
154     // Save the timestamp
155     prevTs = curTs;
156 
157     entryID = std::to_string(curTs);
158     if (index > 0)
159     {
160         entryID += "_" + std::to_string(index);
161     }
162     return true;
163 }
164 
165 inline int getEventLogParams(const std::string& logEntry,
166                              std::string& timestamp, std::string& messageID,
167                              std::vector<std::string>& messageArgs)
168 {
169     // The redfish log format is "<Timestamp> <MessageId>,<MessageArgs>"
170     // First get the Timestamp
171     size_t space = logEntry.find_first_of(' ');
172     if (space == std::string::npos)
173     {
174         return -EINVAL;
175     }
176     timestamp = logEntry.substr(0, space);
177     // Then get the log contents
178     size_t entryStart = logEntry.find_first_not_of(' ', space);
179     if (entryStart == std::string::npos)
180     {
181         return -EINVAL;
182     }
183     std::string_view entry(logEntry);
184     entry.remove_prefix(entryStart);
185     // Use split to separate the entry into its fields
186     std::vector<std::string> logEntryFields;
187     boost::split(logEntryFields, entry, boost::is_any_of(","),
188                  boost::token_compress_on);
189     // We need at least a MessageId to be valid
190     if (logEntryFields.empty())
191     {
192         return -EINVAL;
193     }
194     messageID = logEntryFields[0];
195 
196     // Get the MessageArgs from the log if there are any
197     if (logEntryFields.size() > 1)
198     {
199         const std::string& messageArgsStart = logEntryFields[1];
200         // If the first string is empty, assume there are no MessageArgs
201         if (!messageArgsStart.empty())
202         {
203             messageArgs.assign(logEntryFields.begin() + 1,
204                                logEntryFields.end());
205         }
206     }
207 
208     return 0;
209 }
210 
211 inline void getRegistryAndMessageKey(const std::string& messageID,
212                                      std::string& registryName,
213                                      std::string& messageKey)
214 {
215     // Redfish MessageIds are in the form
216     // RegistryName.MajorVersion.MinorVersion.MessageKey, so parse it to find
217     // the right Message
218     std::vector<std::string> fields;
219     fields.reserve(4);
220     boost::split(fields, messageID, boost::is_any_of("."));
221     if (fields.size() == 4)
222     {
223         registryName = fields[0];
224         messageKey = fields[3];
225     }
226 }
227 
228 inline int formatEventLogEntry(const std::string& logEntryID,
229                                const std::string& messageID,
230                                const std::span<std::string_view> messageArgs,
231                                std::string timestamp,
232                                const std::string& customText,
233                                nlohmann::json& logEntryJson)
234 {
235     // Get the Message from the MessageRegistry
236     const registries::Message* message = registries::formatMessage(messageID);
237 
238     if (message == nullptr)
239     {
240         return -1;
241     }
242 
243     std::string msg =
244         redfish::registries::fillMessageArgs(messageArgs, message->message);
245     if (msg.empty())
246     {
247         return -1;
248     }
249 
250     // Get the Created time from the timestamp. The log timestamp is in
251     // RFC3339 format which matches the Redfish format except for the
252     // fractional seconds between the '.' and the '+', so just remove them.
253     std::size_t dot = timestamp.find_first_of('.');
254     std::size_t plus = timestamp.find_first_of('+', dot);
255     if (dot != std::string::npos && plus != std::string::npos)
256     {
257         timestamp.erase(dot, plus - dot);
258     }
259 
260     // Fill in the log entry with the gathered data
261     logEntryJson["EventId"] = logEntryID;
262     logEntryJson["EventType"] = "Event";
263     logEntryJson["Severity"] = message->messageSeverity;
264     logEntryJson["Message"] = std::move(msg);
265     logEntryJson["MessageId"] = messageID;
266     logEntryJson["MessageArgs"] = messageArgs;
267     logEntryJson["EventTimestamp"] = std::move(timestamp);
268     logEntryJson["Context"] = customText;
269     return 0;
270 }
271 
272 } // namespace event_log
273 #endif
274 
275 inline bool isFilterQuerySpecialChar(char c)
276 {
277     switch (c)
278     {
279         case '(':
280         case ')':
281         case '\'':
282             return true;
283         default:
284             return false;
285     }
286 }
287 
288 inline bool
289     readSSEQueryParams(std::string sseFilter, std::string& formatType,
290                        std::vector<std::string>& messageIds,
291                        std::vector<std::string>& registryPrefixes,
292                        std::vector<std::string>& metricReportDefinitions)
293 {
294     sseFilter.erase(std::remove_if(sseFilter.begin(), sseFilter.end(),
295                                    isFilterQuerySpecialChar),
296                     sseFilter.end());
297 
298     std::vector<std::string> result;
299     boost::split(result, sseFilter, boost::is_any_of(" "),
300                  boost::token_compress_on);
301 
302     BMCWEB_LOG_DEBUG << "No of tokens in SEE query: " << result.size();
303 
304     constexpr uint8_t divisor = 4;
305     constexpr uint8_t minTokenSize = 3;
306     if (result.size() % divisor != minTokenSize)
307     {
308         BMCWEB_LOG_ERROR << "Invalid SSE filter specified.";
309         return false;
310     }
311 
312     for (std::size_t i = 0; i < result.size(); i += divisor)
313     {
314         const std::string& key = result[i];
315         const std::string& op = result[i + 1];
316         const std::string& value = result[i + 2];
317 
318         if ((i + minTokenSize) < result.size())
319         {
320             const std::string& separator = result[i + minTokenSize];
321             // SSE supports only "or" and "and" in query params.
322             if ((separator != "or") && (separator != "and"))
323             {
324                 BMCWEB_LOG_ERROR
325                     << "Invalid group operator in SSE query parameters";
326                 return false;
327             }
328         }
329 
330         // SSE supports only "eq" as per spec.
331         if (op != "eq")
332         {
333             BMCWEB_LOG_ERROR
334                 << "Invalid assignment operator in SSE query parameters";
335             return false;
336         }
337 
338         BMCWEB_LOG_DEBUG << key << " : " << value;
339         if (key == "EventFormatType")
340         {
341             formatType = value;
342         }
343         else if (key == "MessageId")
344         {
345             messageIds.push_back(value);
346         }
347         else if (key == "RegistryPrefix")
348         {
349             registryPrefixes.push_back(value);
350         }
351         else if (key == "MetricReportDefinition")
352         {
353             metricReportDefinitions.push_back(value);
354         }
355         else
356         {
357             BMCWEB_LOG_ERROR << "Invalid property(" << key
358                              << ")in SSE filter query.";
359             return false;
360         }
361     }
362     return true;
363 }
364 
365 class Subscription : public persistent_data::UserSubscription
366 {
367   public:
368     Subscription(const Subscription&) = delete;
369     Subscription& operator=(const Subscription&) = delete;
370     Subscription(Subscription&&) = delete;
371     Subscription& operator=(Subscription&&) = delete;
372 
373     Subscription(const std::string& inHost, uint16_t inPort,
374                  const std::string& inPath, const std::string& inUriProto) :
375         eventSeqNum(1),
376         host(inHost), port(inPort), path(inPath), uriProto(inUriProto)
377     {
378         // Subscription constructor
379     }
380 
381     explicit Subscription(
382         const std::shared_ptr<boost::asio::ip::tcp::socket>& adaptor) :
383         eventSeqNum(1),
384         sseConn(std::make_shared<crow::ServerSentEvents>(adaptor))
385     {}
386 
387     ~Subscription() = default;
388 
389     bool sendEvent(std::string& msg)
390     {
391         persistent_data::EventServiceConfig eventServiceConfig =
392             persistent_data::EventServiceStore::getInstance()
393                 .getEventServiceConfig();
394         if (!eventServiceConfig.enabled)
395         {
396             return false;
397         }
398 
399         bool useSSL = (uriProto == "https");
400         // A connection pool will be created if one does not already exist
401         crow::HttpClient::getInstance().sendData(
402             msg, id, host, port, path, useSSL, httpHeaders,
403             boost::beast::http::verb::post, retryPolicyName);
404         eventSeqNum++;
405 
406         if (sseConn != nullptr)
407         {
408             sseConn->sendData(eventSeqNum, msg);
409         }
410         return true;
411     }
412 
413     bool sendTestEventLog()
414     {
415         nlohmann::json logEntryArray;
416         logEntryArray.push_back({});
417         nlohmann::json& logEntryJson = logEntryArray.back();
418 
419         logEntryJson = {{"EventId", "TestID"},
420                         {"EventType", "Event"},
421                         {"Severity", "OK"},
422                         {"Message", "Generated test event"},
423                         {"MessageId", "OpenBMC.0.2.TestEventLog"},
424                         {"MessageArgs", nlohmann::json::array()},
425                         {"EventTimestamp",
426                          redfish::time_utils::getDateTimeOffsetNow().first},
427                         {"Context", customText}};
428 
429         nlohmann::json msg;
430         msg["@odata.type"] = "#Event.v1_4_0.Event";
431         msg["Id"] = std::to_string(eventSeqNum);
432         msg["Name"] = "Event Log";
433         msg["Events"] = logEntryArray;
434 
435         std::string strMsg =
436             msg.dump(2, ' ', true, nlohmann::json::error_handler_t::replace);
437         return this->sendEvent(strMsg);
438     }
439 
440 #ifndef BMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES
441     void filterAndSendEventLogs(
442         const std::vector<EventLogObjectsType>& eventRecords)
443     {
444         nlohmann::json logEntryArray;
445         for (const EventLogObjectsType& logEntry : eventRecords)
446         {
447             const std::string& idStr = std::get<0>(logEntry);
448             const std::string& timestamp = std::get<1>(logEntry);
449             const std::string& messageID = std::get<2>(logEntry);
450             const std::string& registryName = std::get<3>(logEntry);
451             const std::string& messageKey = std::get<4>(logEntry);
452             const std::vector<std::string>& messageArgs = std::get<5>(logEntry);
453 
454             // If registryPrefixes list is empty, don't filter events
455             // send everything.
456             if (!registryPrefixes.empty())
457             {
458                 auto obj = std::find(registryPrefixes.begin(),
459                                      registryPrefixes.end(), registryName);
460                 if (obj == registryPrefixes.end())
461                 {
462                     continue;
463                 }
464             }
465 
466             // If registryMsgIds list is empty, don't filter events
467             // send everything.
468             if (!registryMsgIds.empty())
469             {
470                 auto obj = std::find(registryMsgIds.begin(),
471                                      registryMsgIds.end(), messageKey);
472                 if (obj == registryMsgIds.end())
473                 {
474                     continue;
475                 }
476             }
477 
478             std::vector<std::string_view> messageArgsView(messageArgs.begin(),
479                                                           messageArgs.end());
480 
481             logEntryArray.push_back({});
482             nlohmann::json& bmcLogEntry = logEntryArray.back();
483             if (event_log::formatEventLogEntry(idStr, messageID,
484                                                messageArgsView, timestamp,
485                                                customText, bmcLogEntry) != 0)
486             {
487                 BMCWEB_LOG_DEBUG << "Read eventLog entry failed";
488                 continue;
489             }
490         }
491 
492         if (logEntryArray.empty())
493         {
494             BMCWEB_LOG_DEBUG << "No log entries available to be transferred.";
495             return;
496         }
497 
498         nlohmann::json msg;
499         msg["@odata.type"] = "#Event.v1_4_0.Event";
500         msg["Id"] = std::to_string(eventSeqNum);
501         msg["Name"] = "Event Log";
502         msg["Events"] = logEntryArray;
503 
504         std::string strMsg =
505             msg.dump(2, ' ', true, nlohmann::json::error_handler_t::replace);
506         this->sendEvent(strMsg);
507     }
508 #endif
509 
510     void filterAndSendReports(const std::string& reportId,
511                               const telemetry::TimestampReadings& var)
512     {
513         boost::urls::url mrdUri =
514             crow::utility::urlFromPieces("redfish", "v1", "TelemetryService",
515                                          "MetricReportDefinitions", reportId);
516 
517         // Empty list means no filter. Send everything.
518         if (!metricReportDefinitions.empty())
519         {
520             if (std::find(metricReportDefinitions.begin(),
521                           metricReportDefinitions.end(),
522                           mrdUri.string()) == metricReportDefinitions.end())
523             {
524                 return;
525             }
526         }
527 
528         nlohmann::json msg;
529         if (!telemetry::fillReport(msg, reportId, var))
530         {
531             BMCWEB_LOG_ERROR << "Failed to fill the MetricReport for DBus "
532                                 "Report with id "
533                              << reportId;
534             return;
535         }
536 
537         // Context is set by user during Event subscription and it must be
538         // set for MetricReport response.
539         if (!customText.empty())
540         {
541             msg["Context"] = customText;
542         }
543 
544         std::string strMsg =
545             msg.dump(2, ' ', true, nlohmann::json::error_handler_t::replace);
546         this->sendEvent(strMsg);
547     }
548 
549     void updateRetryConfig(const uint32_t retryAttempts,
550                            const uint32_t retryTimeoutInterval)
551     {
552         crow::HttpClient::getInstance().setRetryConfig(
553             retryAttempts, retryTimeoutInterval, retryRespHandler,
554             retryPolicyName);
555     }
556 
557     void updateRetryPolicy()
558     {
559         crow::HttpClient::getInstance().setRetryPolicy(retryPolicy,
560                                                        retryPolicyName);
561     }
562 
563     uint64_t getEventSeqNum() const
564     {
565         return eventSeqNum;
566     }
567 
568   private:
569     uint64_t eventSeqNum;
570     std::string host;
571     uint16_t port = 0;
572     std::string path;
573     std::string uriProto;
574     std::shared_ptr<crow::ServerSentEvents> sseConn = nullptr;
575     std::string retryPolicyName = "SubscriptionEvent";
576 
577     // Check used to indicate what response codes are valid as part of our retry
578     // policy.  2XX is considered acceptable
579     static boost::system::error_code retryRespHandler(unsigned int respCode)
580     {
581         BMCWEB_LOG_DEBUG
582             << "Checking response code validity for SubscriptionEvent";
583         if ((respCode < 200) || (respCode >= 300))
584         {
585             return boost::system::errc::make_error_code(
586                 boost::system::errc::result_out_of_range);
587         }
588 
589         // Return 0 if the response code is valid
590         return boost::system::errc::make_error_code(
591             boost::system::errc::success);
592     }
593 };
594 
595 class EventServiceManager
596 {
597   private:
598     bool serviceEnabled = false;
599     uint32_t retryAttempts = 0;
600     uint32_t retryTimeoutInterval = 0;
601 
602     EventServiceManager()
603     {
604         // Load config from persist store.
605         initConfig();
606     }
607 
608     std::streampos redfishLogFilePosition{0};
609     size_t noOfEventLogSubscribers{0};
610     size_t noOfMetricReportSubscribers{0};
611     std::shared_ptr<sdbusplus::bus::match_t> matchTelemetryMonitor;
612     boost::container::flat_map<std::string, std::shared_ptr<Subscription>>
613         subscriptionsMap;
614 
615     uint64_t eventId{1};
616 
617   public:
618     EventServiceManager(const EventServiceManager&) = delete;
619     EventServiceManager& operator=(const EventServiceManager&) = delete;
620     EventServiceManager(EventServiceManager&&) = delete;
621     EventServiceManager& operator=(EventServiceManager&&) = delete;
622     ~EventServiceManager() = default;
623 
624     static EventServiceManager& getInstance()
625     {
626         static EventServiceManager handler;
627         return handler;
628     }
629 
630     void initConfig()
631     {
632         loadOldBehavior();
633 
634         persistent_data::EventServiceConfig eventServiceConfig =
635             persistent_data::EventServiceStore::getInstance()
636                 .getEventServiceConfig();
637 
638         serviceEnabled = eventServiceConfig.enabled;
639         retryAttempts = eventServiceConfig.retryAttempts;
640         retryTimeoutInterval = eventServiceConfig.retryTimeoutInterval;
641 
642         for (const auto& it : persistent_data::EventServiceStore::getInstance()
643                                   .subscriptionsConfigMap)
644         {
645             std::shared_ptr<persistent_data::UserSubscription> newSub =
646                 it.second;
647 
648             std::string host;
649             std::string urlProto;
650             uint16_t port = 0;
651             std::string path;
652             bool status = crow::utility::validateAndSplitUrl(
653                 newSub->destinationUrl, urlProto, host, port, path);
654 
655             if (!status)
656             {
657                 BMCWEB_LOG_ERROR
658                     << "Failed to validate and split destination url";
659                 continue;
660             }
661             std::shared_ptr<Subscription> subValue =
662                 std::make_shared<Subscription>(host, port, path, urlProto);
663 
664             subValue->id = newSub->id;
665             subValue->destinationUrl = newSub->destinationUrl;
666             subValue->protocol = newSub->protocol;
667             subValue->retryPolicy = newSub->retryPolicy;
668             subValue->customText = newSub->customText;
669             subValue->eventFormatType = newSub->eventFormatType;
670             subValue->subscriptionType = newSub->subscriptionType;
671             subValue->registryMsgIds = newSub->registryMsgIds;
672             subValue->registryPrefixes = newSub->registryPrefixes;
673             subValue->resourceTypes = newSub->resourceTypes;
674             subValue->httpHeaders = newSub->httpHeaders;
675             subValue->metricReportDefinitions = newSub->metricReportDefinitions;
676 
677             if (subValue->id.empty())
678             {
679                 BMCWEB_LOG_ERROR << "Failed to add subscription";
680             }
681             subscriptionsMap.insert(std::pair(subValue->id, subValue));
682 
683             updateNoOfSubscribersCount();
684 
685 #ifndef BMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES
686 
687             cacheRedfishLogFile();
688 
689 #endif
690             // Update retry configuration.
691             subValue->updateRetryConfig(retryAttempts, retryTimeoutInterval);
692             subValue->updateRetryPolicy();
693         }
694     }
695 
696     static void loadOldBehavior()
697     {
698         std::ifstream eventConfigFile(eventServiceFile);
699         if (!eventConfigFile.good())
700         {
701             BMCWEB_LOG_DEBUG << "Old eventService config not exist";
702             return;
703         }
704         auto jsonData = nlohmann::json::parse(eventConfigFile, nullptr, false);
705         if (jsonData.is_discarded())
706         {
707             BMCWEB_LOG_ERROR << "Old eventService config parse error.";
708             return;
709         }
710 
711         for (const auto& item : jsonData.items())
712         {
713             if (item.key() == "Configuration")
714             {
715                 persistent_data::EventServiceStore::getInstance()
716                     .getEventServiceConfig()
717                     .fromJson(item.value());
718             }
719             else if (item.key() == "Subscriptions")
720             {
721                 for (const auto& elem : item.value())
722                 {
723                     std::shared_ptr<persistent_data::UserSubscription>
724                         newSubscription =
725                             persistent_data::UserSubscription::fromJson(elem,
726                                                                         true);
727                     if (newSubscription == nullptr)
728                     {
729                         BMCWEB_LOG_ERROR << "Problem reading subscription "
730                                             "from old persistent store";
731                         continue;
732                     }
733 
734                     std::uniform_int_distribution<uint32_t> dist(0);
735                     bmcweb::OpenSSLGenerator gen;
736 
737                     std::string id;
738 
739                     int retry = 3;
740                     while (retry != 0)
741                     {
742                         id = std::to_string(dist(gen));
743                         if (gen.error())
744                         {
745                             retry = 0;
746                             break;
747                         }
748                         newSubscription->id = id;
749                         auto inserted =
750                             persistent_data::EventServiceStore::getInstance()
751                                 .subscriptionsConfigMap.insert(
752                                     std::pair(id, newSubscription));
753                         if (inserted.second)
754                         {
755                             break;
756                         }
757                         --retry;
758                     }
759 
760                     if (retry <= 0)
761                     {
762                         BMCWEB_LOG_ERROR
763                             << "Failed to generate random number from old "
764                                "persistent store";
765                         continue;
766                     }
767                 }
768             }
769 
770             persistent_data::getConfig().writeData();
771             std::remove(eventServiceFile);
772             BMCWEB_LOG_DEBUG << "Remove old eventservice config";
773         }
774     }
775 
776     void updateSubscriptionData() const
777     {
778         persistent_data::EventServiceStore::getInstance()
779             .eventServiceConfig.enabled = serviceEnabled;
780         persistent_data::EventServiceStore::getInstance()
781             .eventServiceConfig.retryAttempts = retryAttempts;
782         persistent_data::EventServiceStore::getInstance()
783             .eventServiceConfig.retryTimeoutInterval = retryTimeoutInterval;
784 
785         persistent_data::getConfig().writeData();
786     }
787 
788     void setEventServiceConfig(const persistent_data::EventServiceConfig& cfg)
789     {
790         bool updateConfig = false;
791         bool updateRetryCfg = false;
792 
793         if (serviceEnabled != cfg.enabled)
794         {
795             serviceEnabled = cfg.enabled;
796             if (serviceEnabled && noOfMetricReportSubscribers != 0U)
797             {
798                 registerMetricReportSignal();
799             }
800             else
801             {
802                 unregisterMetricReportSignal();
803             }
804             updateConfig = true;
805         }
806 
807         if (retryAttempts != cfg.retryAttempts)
808         {
809             retryAttempts = cfg.retryAttempts;
810             updateConfig = true;
811             updateRetryCfg = true;
812         }
813 
814         if (retryTimeoutInterval != cfg.retryTimeoutInterval)
815         {
816             retryTimeoutInterval = cfg.retryTimeoutInterval;
817             updateConfig = true;
818             updateRetryCfg = true;
819         }
820 
821         if (updateConfig)
822         {
823             updateSubscriptionData();
824         }
825 
826         if (updateRetryCfg)
827         {
828             // Update the changed retry config to all subscriptions
829             for (const auto& it :
830                  EventServiceManager::getInstance().subscriptionsMap)
831             {
832                 std::shared_ptr<Subscription> entry = it.second;
833                 entry->updateRetryConfig(retryAttempts, retryTimeoutInterval);
834             }
835         }
836     }
837 
838     void updateNoOfSubscribersCount()
839     {
840         size_t eventLogSubCount = 0;
841         size_t metricReportSubCount = 0;
842         for (const auto& it : subscriptionsMap)
843         {
844             std::shared_ptr<Subscription> entry = it.second;
845             if (entry->eventFormatType == eventFormatType)
846             {
847                 eventLogSubCount++;
848             }
849             else if (entry->eventFormatType == metricReportFormatType)
850             {
851                 metricReportSubCount++;
852             }
853         }
854 
855         noOfEventLogSubscribers = eventLogSubCount;
856         if (noOfMetricReportSubscribers != metricReportSubCount)
857         {
858             noOfMetricReportSubscribers = metricReportSubCount;
859             if (noOfMetricReportSubscribers != 0U)
860             {
861                 registerMetricReportSignal();
862             }
863             else
864             {
865                 unregisterMetricReportSignal();
866             }
867         }
868     }
869 
870     std::shared_ptr<Subscription> getSubscription(const std::string& id)
871     {
872         auto obj = subscriptionsMap.find(id);
873         if (obj == subscriptionsMap.end())
874         {
875             BMCWEB_LOG_ERROR << "No subscription exist with ID:" << id;
876             return nullptr;
877         }
878         std::shared_ptr<Subscription> subValue = obj->second;
879         return subValue;
880     }
881 
882     std::string addSubscription(const std::shared_ptr<Subscription>& subValue,
883                                 const bool updateFile = true)
884     {
885 
886         std::uniform_int_distribution<uint32_t> dist(0);
887         bmcweb::OpenSSLGenerator gen;
888 
889         std::string id;
890 
891         int retry = 3;
892         while (retry != 0)
893         {
894             id = std::to_string(dist(gen));
895             if (gen.error())
896             {
897                 retry = 0;
898                 break;
899             }
900             auto inserted = subscriptionsMap.insert(std::pair(id, subValue));
901             if (inserted.second)
902             {
903                 break;
904             }
905             --retry;
906         }
907 
908         if (retry <= 0)
909         {
910             BMCWEB_LOG_ERROR << "Failed to generate random number";
911             return "";
912         }
913 
914         std::shared_ptr<persistent_data::UserSubscription> newSub =
915             std::make_shared<persistent_data::UserSubscription>();
916         newSub->id = id;
917         newSub->destinationUrl = subValue->destinationUrl;
918         newSub->protocol = subValue->protocol;
919         newSub->retryPolicy = subValue->retryPolicy;
920         newSub->customText = subValue->customText;
921         newSub->eventFormatType = subValue->eventFormatType;
922         newSub->subscriptionType = subValue->subscriptionType;
923         newSub->registryMsgIds = subValue->registryMsgIds;
924         newSub->registryPrefixes = subValue->registryPrefixes;
925         newSub->resourceTypes = subValue->resourceTypes;
926         newSub->httpHeaders = subValue->httpHeaders;
927         newSub->metricReportDefinitions = subValue->metricReportDefinitions;
928         persistent_data::EventServiceStore::getInstance()
929             .subscriptionsConfigMap.emplace(newSub->id, newSub);
930 
931         updateNoOfSubscribersCount();
932 
933         if (updateFile)
934         {
935             updateSubscriptionData();
936         }
937 
938 #ifndef BMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES
939         if (redfishLogFilePosition != 0)
940         {
941             cacheRedfishLogFile();
942         }
943 #endif
944         // Update retry configuration.
945         subValue->updateRetryConfig(retryAttempts, retryTimeoutInterval);
946         subValue->updateRetryPolicy();
947 
948         return id;
949     }
950 
951     bool isSubscriptionExist(const std::string& id)
952     {
953         auto obj = subscriptionsMap.find(id);
954         return obj != subscriptionsMap.end();
955     }
956 
957     void deleteSubscription(const std::string& id)
958     {
959         auto obj = subscriptionsMap.find(id);
960         if (obj != subscriptionsMap.end())
961         {
962             subscriptionsMap.erase(obj);
963             auto obj2 = persistent_data::EventServiceStore::getInstance()
964                             .subscriptionsConfigMap.find(id);
965             persistent_data::EventServiceStore::getInstance()
966                 .subscriptionsConfigMap.erase(obj2);
967             updateNoOfSubscribersCount();
968             updateSubscriptionData();
969         }
970     }
971 
972     size_t getNumberOfSubscriptions()
973     {
974         return subscriptionsMap.size();
975     }
976 
977     std::vector<std::string> getAllIDs()
978     {
979         std::vector<std::string> idList;
980         for (const auto& it : subscriptionsMap)
981         {
982             idList.emplace_back(it.first);
983         }
984         return idList;
985     }
986 
987     bool isDestinationExist(const std::string& destUrl)
988     {
989         for (const auto& it : subscriptionsMap)
990         {
991             std::shared_ptr<Subscription> entry = it.second;
992             if (entry->destinationUrl == destUrl)
993             {
994                 BMCWEB_LOG_ERROR << "Destination exist already" << destUrl;
995                 return true;
996             }
997         }
998         return false;
999     }
1000 
1001     bool sendTestEventLog()
1002     {
1003         for (const auto& it : this->subscriptionsMap)
1004         {
1005             std::shared_ptr<Subscription> entry = it.second;
1006             if (!entry->sendTestEventLog())
1007             {
1008                 return false;
1009             }
1010         }
1011         return true;
1012     }
1013 
1014     void sendEvent(const nlohmann::json& eventMessageIn,
1015                    const std::string& origin, const std::string& resType)
1016     {
1017         if (!serviceEnabled || (noOfEventLogSubscribers == 0U))
1018         {
1019             BMCWEB_LOG_DEBUG << "EventService disabled or no Subscriptions.";
1020             return;
1021         }
1022         nlohmann::json eventRecord = nlohmann::json::array();
1023         nlohmann::json eventMessage = eventMessageIn;
1024         // MemberId is 0 : since we are sending one event record.
1025         uint64_t memberId = 0;
1026 
1027         nlohmann::json event = {
1028             {"EventId", eventId},
1029             {"MemberId", memberId},
1030             {"EventTimestamp",
1031              redfish::time_utils::getDateTimeOffsetNow().first},
1032             {"OriginOfCondition", origin}};
1033         for (nlohmann::json::iterator it = event.begin(); it != event.end();
1034              ++it)
1035         {
1036             eventMessage[it.key()] = it.value();
1037         }
1038         eventRecord.push_back(eventMessage);
1039 
1040         for (const auto& it : this->subscriptionsMap)
1041         {
1042             std::shared_ptr<Subscription> entry = it.second;
1043             bool isSubscribed = false;
1044             // Search the resourceTypes list for the subscription.
1045             // If resourceTypes list is empty, don't filter events
1046             // send everything.
1047             if (!entry->resourceTypes.empty())
1048             {
1049                 for (const auto& resource : entry->resourceTypes)
1050                 {
1051                     if (resType == resource)
1052                     {
1053                         BMCWEB_LOG_INFO << "ResourceType " << resource
1054                                         << " found in the subscribed list";
1055                         isSubscribed = true;
1056                         break;
1057                     }
1058                 }
1059             }
1060             else // resourceTypes list is empty.
1061             {
1062                 isSubscribed = true;
1063             }
1064             if (isSubscribed)
1065             {
1066                 nlohmann::json msgJson = {
1067                     {"@odata.type", "#Event.v1_4_0.Event"},
1068                     {"Name", "Event Log"},
1069                     {"Id", eventId},
1070                     {"Events", eventRecord}};
1071 
1072                 std::string strMsg = msgJson.dump(
1073                     2, ' ', true, nlohmann::json::error_handler_t::replace);
1074                 entry->sendEvent(strMsg);
1075                 eventId++; // increament the eventId
1076             }
1077             else
1078             {
1079                 BMCWEB_LOG_INFO << "Not subscribed to this resource";
1080             }
1081         }
1082     }
1083     void sendBroadcastMsg(const std::string& broadcastMsg)
1084     {
1085         for (const auto& it : this->subscriptionsMap)
1086         {
1087             std::shared_ptr<Subscription> entry = it.second;
1088             nlohmann::json msgJson = {
1089                 {"Timestamp",
1090                  redfish::time_utils::getDateTimeOffsetNow().first},
1091                 {"OriginOfCondition", "/ibm/v1/HMC/BroadcastService"},
1092                 {"Name", "Broadcast Message"},
1093                 {"Message", broadcastMsg}};
1094 
1095             std::string strMsg = msgJson.dump(
1096                 2, ' ', true, nlohmann::json::error_handler_t::replace);
1097             entry->sendEvent(strMsg);
1098         }
1099     }
1100 
1101 #ifndef BMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES
1102 
1103     void resetRedfishFilePosition()
1104     {
1105         // Control would be here when Redfish file is created.
1106         // Reset File Position as new file is created
1107         redfishLogFilePosition = 0;
1108     }
1109 
1110     void cacheRedfishLogFile()
1111     {
1112         // Open the redfish file and read till the last record.
1113 
1114         std::ifstream logStream(redfishEventLogFile);
1115         if (!logStream.good())
1116         {
1117             BMCWEB_LOG_ERROR << " Redfish log file open failed \n";
1118             return;
1119         }
1120         std::string logEntry;
1121         while (std::getline(logStream, logEntry))
1122         {
1123             redfishLogFilePosition = logStream.tellg();
1124         }
1125 
1126         BMCWEB_LOG_DEBUG << "Next Log Position : " << redfishLogFilePosition;
1127     }
1128 
1129     void readEventLogsFromFile()
1130     {
1131         std::ifstream logStream(redfishEventLogFile);
1132         if (!logStream.good())
1133         {
1134             BMCWEB_LOG_ERROR << " Redfish log file open failed";
1135             return;
1136         }
1137 
1138         std::vector<EventLogObjectsType> eventRecords;
1139 
1140         std::string logEntry;
1141 
1142         // Get the read pointer to the next log to be read.
1143         logStream.seekg(redfishLogFilePosition);
1144 
1145         while (std::getline(logStream, logEntry))
1146         {
1147             // Update Pointer position
1148             redfishLogFilePosition = logStream.tellg();
1149 
1150             std::string idStr;
1151             if (!event_log::getUniqueEntryID(logEntry, idStr))
1152             {
1153                 continue;
1154             }
1155 
1156             if (!serviceEnabled || noOfEventLogSubscribers == 0)
1157             {
1158                 // If Service is not enabled, no need to compute
1159                 // the remaining items below.
1160                 // But, Loop must continue to keep track of Timestamp
1161                 continue;
1162             }
1163 
1164             std::string timestamp;
1165             std::string messageID;
1166             std::vector<std::string> messageArgs;
1167             if (event_log::getEventLogParams(logEntry, timestamp, messageID,
1168                                              messageArgs) != 0)
1169             {
1170                 BMCWEB_LOG_DEBUG << "Read eventLog entry params failed";
1171                 continue;
1172             }
1173 
1174             std::string registryName;
1175             std::string messageKey;
1176             event_log::getRegistryAndMessageKey(messageID, registryName,
1177                                                 messageKey);
1178             if (registryName.empty() || messageKey.empty())
1179             {
1180                 continue;
1181             }
1182 
1183             eventRecords.emplace_back(idStr, timestamp, messageID, registryName,
1184                                       messageKey, messageArgs);
1185         }
1186 
1187         if (!serviceEnabled || noOfEventLogSubscribers == 0)
1188         {
1189             BMCWEB_LOG_DEBUG << "EventService disabled or no Subscriptions.";
1190             return;
1191         }
1192 
1193         if (eventRecords.empty())
1194         {
1195             // No Records to send
1196             BMCWEB_LOG_DEBUG << "No log entries available to be transferred.";
1197             return;
1198         }
1199 
1200         for (const auto& it : this->subscriptionsMap)
1201         {
1202             std::shared_ptr<Subscription> entry = it.second;
1203             if (entry->eventFormatType == "Event")
1204             {
1205                 entry->filterAndSendEventLogs(eventRecords);
1206             }
1207         }
1208     }
1209 
1210     static void watchRedfishEventLogFile()
1211     {
1212         if (!inotifyConn)
1213         {
1214             return;
1215         }
1216 
1217         static std::array<char, 1024> readBuffer;
1218 
1219         inotifyConn->async_read_some(boost::asio::buffer(readBuffer),
1220                                      [&](const boost::system::error_code& ec,
1221                                          const std::size_t& bytesTransferred) {
1222             if (ec)
1223             {
1224                 BMCWEB_LOG_ERROR << "Callback Error: " << ec.message();
1225                 return;
1226             }
1227             std::size_t index = 0;
1228             while ((index + iEventSize) <= bytesTransferred)
1229             {
1230                 struct inotify_event event
1231                 {};
1232                 std::memcpy(&event, &readBuffer[index], iEventSize);
1233                 if (event.wd == dirWatchDesc)
1234                 {
1235                     if ((event.len == 0) ||
1236                         (index + iEventSize + event.len > bytesTransferred))
1237                     {
1238                         index += (iEventSize + event.len);
1239                         continue;
1240                     }
1241 
1242                     std::string fileName(&readBuffer[index + iEventSize]);
1243                     if (fileName != "redfish")
1244                     {
1245                         index += (iEventSize + event.len);
1246                         continue;
1247                     }
1248 
1249                     BMCWEB_LOG_DEBUG
1250                         << "Redfish log file created/deleted. event.name: "
1251                         << fileName;
1252                     if (event.mask == IN_CREATE)
1253                     {
1254                         if (fileWatchDesc != -1)
1255                         {
1256                             BMCWEB_LOG_DEBUG
1257                                 << "Remove and Add inotify watcher on "
1258                                    "redfish event log file";
1259                             // Remove existing inotify watcher and add
1260                             // with new redfish event log file.
1261                             inotify_rm_watch(inotifyFd, fileWatchDesc);
1262                             fileWatchDesc = -1;
1263                         }
1264 
1265                         fileWatchDesc = inotify_add_watch(
1266                             inotifyFd, redfishEventLogFile, IN_MODIFY);
1267                         if (fileWatchDesc == -1)
1268                         {
1269                             BMCWEB_LOG_ERROR << "inotify_add_watch failed for "
1270                                                 "redfish log file.";
1271                             return;
1272                         }
1273 
1274                         EventServiceManager::getInstance()
1275                             .resetRedfishFilePosition();
1276                         EventServiceManager::getInstance()
1277                             .readEventLogsFromFile();
1278                     }
1279                     else if ((event.mask == IN_DELETE) ||
1280                              (event.mask == IN_MOVED_TO))
1281                     {
1282                         if (fileWatchDesc != -1)
1283                         {
1284                             inotify_rm_watch(inotifyFd, fileWatchDesc);
1285                             fileWatchDesc = -1;
1286                         }
1287                     }
1288                 }
1289                 else if (event.wd == fileWatchDesc)
1290                 {
1291                     if (event.mask == IN_MODIFY)
1292                     {
1293                         EventServiceManager::getInstance()
1294                             .readEventLogsFromFile();
1295                     }
1296                 }
1297                 index += (iEventSize + event.len);
1298             }
1299 
1300             watchRedfishEventLogFile();
1301         });
1302     }
1303 
1304     static int startEventLogMonitor(boost::asio::io_context& ioc)
1305     {
1306         inotifyConn.emplace(ioc);
1307         inotifyFd = inotify_init1(IN_NONBLOCK);
1308         if (inotifyFd == -1)
1309         {
1310             BMCWEB_LOG_ERROR << "inotify_init1 failed.";
1311             return -1;
1312         }
1313 
1314         // Add watch on directory to handle redfish event log file
1315         // create/delete.
1316         dirWatchDesc = inotify_add_watch(inotifyFd, redfishEventLogDir,
1317                                          IN_CREATE | IN_MOVED_TO | IN_DELETE);
1318         if (dirWatchDesc == -1)
1319         {
1320             BMCWEB_LOG_ERROR
1321                 << "inotify_add_watch failed for event log directory.";
1322             return -1;
1323         }
1324 
1325         // Watch redfish event log file for modifications.
1326         fileWatchDesc =
1327             inotify_add_watch(inotifyFd, redfishEventLogFile, IN_MODIFY);
1328         if (fileWatchDesc == -1)
1329         {
1330             BMCWEB_LOG_ERROR
1331                 << "inotify_add_watch failed for redfish log file.";
1332             // Don't return error if file not exist.
1333             // Watch on directory will handle create/delete of file.
1334         }
1335 
1336         // monitor redfish event log file
1337         inotifyConn->assign(inotifyFd);
1338         watchRedfishEventLogFile();
1339 
1340         return 0;
1341     }
1342 
1343 #endif
1344     static void getReadingsForReport(sdbusplus::message_t& msg)
1345     {
1346         if (msg.is_method_error())
1347         {
1348             BMCWEB_LOG_ERROR << "TelemetryMonitor Signal error";
1349             return;
1350         }
1351 
1352         sdbusplus::message::object_path path(msg.get_path());
1353         std::string id = path.filename();
1354         if (id.empty())
1355         {
1356             BMCWEB_LOG_ERROR << "Failed to get Id from path";
1357             return;
1358         }
1359 
1360         std::string interface;
1361         dbus::utility::DBusPropertiesMap props;
1362         std::vector<std::string> invalidProps;
1363         msg.read(interface, props, invalidProps);
1364 
1365         auto found =
1366             std::find_if(props.begin(), props.end(),
1367                          [](const auto& x) { return x.first == "Readings"; });
1368         if (found == props.end())
1369         {
1370             BMCWEB_LOG_INFO << "Failed to get Readings from Report properties";
1371             return;
1372         }
1373 
1374         const telemetry::TimestampReadings* readings =
1375             std::get_if<telemetry::TimestampReadings>(&found->second);
1376         if (readings == nullptr)
1377         {
1378             BMCWEB_LOG_INFO << "Failed to get Readings from Report properties";
1379             return;
1380         }
1381 
1382         for (const auto& it :
1383              EventServiceManager::getInstance().subscriptionsMap)
1384         {
1385             Subscription& entry = *it.second;
1386             if (entry.eventFormatType == metricReportFormatType)
1387             {
1388                 entry.filterAndSendReports(id, *readings);
1389             }
1390         }
1391     }
1392 
1393     void unregisterMetricReportSignal()
1394     {
1395         if (matchTelemetryMonitor)
1396         {
1397             BMCWEB_LOG_DEBUG << "Metrics report signal - Unregister";
1398             matchTelemetryMonitor.reset();
1399             matchTelemetryMonitor = nullptr;
1400         }
1401     }
1402 
1403     void registerMetricReportSignal()
1404     {
1405         if (!serviceEnabled || matchTelemetryMonitor)
1406         {
1407             BMCWEB_LOG_DEBUG << "Not registering metric report signal.";
1408             return;
1409         }
1410 
1411         BMCWEB_LOG_DEBUG << "Metrics report signal - Register";
1412         std::string matchStr = "type='signal',member='PropertiesChanged',"
1413                                "interface='org.freedesktop.DBus.Properties',"
1414                                "arg0=xyz.openbmc_project.Telemetry.Report";
1415 
1416         matchTelemetryMonitor = std::make_shared<sdbusplus::bus::match_t>(
1417             *crow::connections::systemBus, matchStr, getReadingsForReport);
1418     }
1419 };
1420 
1421 } // namespace redfish
1422