1 /**
2  * Copyright 2019 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 
17 #include "sensors/buildjson.hpp"
18 
19 #include "conf.hpp"
20 #include "sensors/sensor.hpp"
21 
22 #include <cstdio>
23 #include <nlohmann/json.hpp>
24 
25 using json = nlohmann::json;
26 
27 namespace conf
28 {
29 void from_json(const json& j, conf::SensorConfig& s)
30 {
31     j.at("type").get_to(s.type);
32     j.at("readPath").get_to(s.readPath);
33 
34     /* The writePath field is optional in a configuration */
35     auto writePath = j.find("writePath");
36     if (writePath == j.end())
37     {
38         s.writePath = "";
39     }
40     else
41     {
42         j.at("writePath").get_to(s.writePath);
43     }
44 
45     /* Default to not ignore dbus MinValue/MaxValue - only used by passive
46      * sensors.
47      */
48     s.ignoreDbusMinMax = false;
49     s.min = 0;
50     s.max = 0;
51 
52     auto ignore = j.find("ignoreDbusMinMax");
53     if (ignore != j.end())
54     {
55         j.at("ignoreDbusMinMax").get_to(s.ignoreDbusMinMax);
56     }
57 
58     /* The min field is optional in a configuration. */
59     auto min = j.find("min");
60     if (min != j.end())
61     {
62         if (s.type == "fan")
63         {
64             j.at("min").get_to(s.min);
65         }
66         else
67         {
68             std::fprintf(stderr, "Non-fan types ignore min value specified\n");
69         }
70     }
71 
72     /* The max field is optional in a configuration. */
73     auto max = j.find("max");
74     if (max != j.end())
75     {
76         if (s.type == "fan")
77         {
78             j.at("max").get_to(s.max);
79         }
80         else
81         {
82             std::fprintf(stderr, "Non-fan types ignore max value specified\n");
83         }
84     }
85 
86     /* The timeout field is optional in a configuration. */
87     auto timeout = j.find("timeout");
88     if (timeout == j.end())
89     {
90         s.timeout = Sensor::getDefaultTimeout(s.type);
91     }
92     else
93     {
94         j.at("timeout").get_to(s.timeout);
95     }
96 }
97 } // namespace conf
98 
99 std::map<std::string, struct conf::SensorConfig>
100     buildSensorsFromJson(const json& data)
101 {
102     std::map<std::string, struct conf::SensorConfig> config;
103     auto sensors = data["sensors"];
104 
105     /* TODO: If no sensors, this is invalid, and we should except here or during
106      * parsing.
107      */
108     for (const auto& sensor : sensors)
109     {
110         config[sensor["name"]] = sensor.get<struct conf::SensorConfig>();
111     }
112 
113     return config;
114 }
115