1 /**
2  * Copyright 2017 Google Inc.
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 #include "dbuspassive.hpp"
17 
18 #include "dbuspassiveredundancy.hpp"
19 #include "util.hpp"
20 
21 #include <chrono>
22 #include <cmath>
23 #include <memory>
24 #include <mutex>
25 #include <sdbusplus/bus.hpp>
26 #include <string>
27 #include <variant>
28 
29 std::unique_ptr<ReadInterface> DbusPassive::createDbusPassive(
30     sdbusplus::bus::bus& bus, const std::string& type, const std::string& id,
31     DbusHelperInterface* helper, const conf::SensorConfig* info,
32     const std::shared_ptr<DbusPassiveRedundancy>& redundancy)
33 {
34     if (helper == nullptr)
35     {
36         return nullptr;
37     }
38     if (!validType(type))
39     {
40         return nullptr;
41     }
42 
43     /* Need to get the scale and initial value */
44     auto tempBus = sdbusplus::bus::new_system();
45 
46     /* service == busname */
47     std::string path = getSensorPath(type, id);
48 
49     struct SensorProperties settings;
50     bool failed;
51 
52     try
53     {
54         std::string service = helper->getService(tempBus, sensorintf, path);
55 
56         helper->getProperties(tempBus, service, path, &settings);
57         failed = helper->thresholdsAsserted(tempBus, service, path);
58     }
59     catch (const std::exception& e)
60     {
61         return nullptr;
62     }
63 
64     return std::make_unique<DbusPassive>(bus, type, id, helper, settings,
65                                          failed, path, redundancy);
66 }
67 
68 DbusPassive::DbusPassive(
69     sdbusplus::bus::bus& bus, const std::string& type, const std::string& id,
70     DbusHelperInterface* helper, const struct SensorProperties& settings,
71     bool failed, const std::string& path,
72     const std::shared_ptr<DbusPassiveRedundancy>& redundancy) :
73     ReadInterface(),
74     _bus(bus), _signal(bus, getMatch(type, id).c_str(), dbusHandleSignal, this),
75     _id(id), _helper(helper), _failed(failed), path(path),
76     redundancy(redundancy)
77 
78 {
79     _scale = settings.scale;
80     _value = settings.value * pow(10, _scale);
81     _min = settings.min * pow(10, _scale);
82     _max = settings.max * pow(10, _scale);
83     _updated = std::chrono::high_resolution_clock::now();
84 }
85 
86 ReadReturn DbusPassive::read(void)
87 {
88     std::lock_guard<std::mutex> guard(_lock);
89 
90     struct ReadReturn r = {_value, _updated};
91 
92     return r;
93 }
94 
95 void DbusPassive::setValue(double value)
96 {
97     std::lock_guard<std::mutex> guard(_lock);
98 
99     _value = value;
100     _updated = std::chrono::high_resolution_clock::now();
101 }
102 
103 bool DbusPassive::getFailed(void) const
104 {
105     if (redundancy)
106     {
107         const std::set<std::string>& failures = redundancy->getFailed();
108         if (failures.find(path) != failures.end())
109         {
110             return true;
111         }
112     }
113     return _failed;
114 }
115 
116 void DbusPassive::setFailed(bool value)
117 {
118     _failed = value;
119 }
120 
121 int64_t DbusPassive::getScale(void)
122 {
123     return _scale;
124 }
125 
126 std::string DbusPassive::getID(void)
127 {
128     return _id;
129 }
130 
131 double DbusPassive::getMax(void)
132 {
133     return _max;
134 }
135 
136 double DbusPassive::getMin(void)
137 {
138     return _min;
139 }
140 
141 int handleSensorValue(sdbusplus::message::message& msg, DbusPassive* owner)
142 {
143     std::string msgSensor;
144     std::map<std::string, std::variant<int64_t, double, bool>> msgData;
145 
146     msg.read(msgSensor, msgData);
147 
148     if (msgSensor == "xyz.openbmc_project.Sensor.Value")
149     {
150         auto valPropMap = msgData.find("Value");
151         if (valPropMap != msgData.end())
152         {
153             double value =
154                 std::visit(VariantToDoubleVisitor(), valPropMap->second);
155 
156             value *= std::pow(10, owner->getScale());
157 
158             scaleSensorReading(owner->getMin(), owner->getMax(), value);
159 
160             owner->setValue(value);
161         }
162     }
163     else if (msgSensor == "xyz.openbmc_project.Sensor.Threshold.Critical")
164     {
165         auto criticalAlarmLow = msgData.find("CriticalAlarmLow");
166         auto criticalAlarmHigh = msgData.find("CriticalAlarmHigh");
167         if (criticalAlarmHigh == msgData.end() &&
168             criticalAlarmLow == msgData.end())
169         {
170             return 0;
171         }
172 
173         bool asserted = false;
174         if (criticalAlarmLow != msgData.end())
175         {
176             asserted = std::get<bool>(criticalAlarmLow->second);
177         }
178 
179         // checking both as in theory you could de-assert one threshold and
180         // assert the other at the same moment
181         if (!asserted && criticalAlarmHigh != msgData.end())
182         {
183             asserted = std::get<bool>(criticalAlarmHigh->second);
184         }
185         owner->setFailed(asserted);
186     }
187 
188     return 0;
189 }
190 
191 int dbusHandleSignal(sd_bus_message* msg, void* usrData, sd_bus_error* err)
192 {
193     auto sdbpMsg = sdbusplus::message::message(msg);
194     DbusPassive* obj = static_cast<DbusPassive*>(usrData);
195 
196     return handleSensorValue(sdbpMsg, obj);
197 }
198