1 /**
2  * Copyright © 2017 IBM 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 
17 #include "config.h"
18 #include "event.hpp"
19 #include "event_manager.hpp"
20 #include "event_serialize.hpp"
21 
22 #include <experimental/filesystem>
23 
24 namespace phosphor
25 {
26 namespace events
27 {
28 
29 void Manager::create(const std::string& eventName,
30                      const std::string& eventMessage,
31                      const std::string& objectPath,
32                      const std::string& propertyName,
33                      const std::string& propertyValue)
34 {
35     using namespace std::string_literals;
36     namespace fs = std::experimental::filesystem;
37 
38     auto msg = eventMessage;
39     std::vector<std::string> additionalData;
40 
41     auto propVal = propertyName + "=" + propertyValue;
42     auto path = "path="s + objectPath;
43 
44     additionalData.push_back(std::move(path));
45     additionalData.push_back(std::move(propVal));
46 
47     auto& eventQueue = eventMap[eventName];
48 
49     // get the last event entry for this event
50     // to generate the id.
51     auto id = 0;
52     if (eventQueue.size() > 0)
53     {
54         fs::path path(eventQueue.back()->objectPath);
55         id = std::stoi(std::string(path.filename().c_str()));
56         id++;
57     }
58 
59     auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
60                   std::chrono::system_clock::now().time_since_epoch())
61                   .count();
62 
63     auto objPath =
64         std::string(OBJ_EVENT) + '/' + eventName + '/' + std::to_string(id);
65 
66     // check for capping of the events,if cap reached then erase the oldest
67     // event.
68     if (eventQueue.size() == MAX_EVENTS)
69     {
70         fs::path eventPath(EVENTS_PERSIST_PATH);
71         eventPath /= eventName;
72         eventPath /= std::to_string(eventQueue.front()->timestamp());
73         eventQueue.pop();
74         std::error_code ec;
75         fs::remove(eventPath, ec);
76     }
77 
78     auto event =
79         std::make_unique<Entry>(objPath,
80                                 ms, // Milliseconds since 1970
81                                 std::move(msg), std::move(additionalData));
82     serialize(*event, eventName);
83     eventQueue.push(std::move(event));
84 }
85 
86 void Manager::restore()
87 {
88     if (!fs::exists(EVENTS_PERSIST_PATH) || fs::is_empty(EVENTS_PERSIST_PATH))
89     {
90         return;
91     }
92 
93     for (auto& eventFile :
94          fs::recursive_directory_iterator(EVENTS_PERSIST_PATH))
95     {
96         if (!fs::is_regular_file(eventFile))
97         {
98             continue;
99         }
100 
101         EventQueue events;
102 
103         auto eventPath = eventFile.path().string();
104         auto pos1 = eventPath.rfind("/");
105         auto pos2 = eventPath.rfind("/", pos1 - 1) + 1;
106         auto eventName = eventPath.substr(pos2, (pos1 - pos2));
107         auto validEvent = false;
108         auto timestamp = eventFile.path().filename().string();
109         auto tsNum = std::stoll(timestamp);
110         auto objPath =
111             std::string(OBJ_EVENT) + '/' + eventName + '/' + timestamp;
112 
113         auto event = std::make_unique<Entry>(objPath, tsNum);
114         if (deserialize(eventFile.path(), *event))
115         {
116             event->emit_object_added();
117             events.push(std::move(event));
118             validEvent = true;
119         }
120 
121         if (validEvent)
122         {
123             eventMap[eventName] = std::move(events);
124         }
125     }
126 }
127 
128 Manager& getManager()
129 {
130     static Manager mgr;
131     return mgr;
132 }
133 
134 } // namespace events
135 } // namespace phosphor
136