1 #include "config.h"
2 
3 #include "json-config.hpp"
4 #include "ledlayout.hpp"
5 
6 #include <nlohmann/json.hpp>
7 #include <phosphor-logging/lg2.hpp>
8 #include <sdbusplus/bus.hpp>
9 #include <sdeventplus/event.hpp>
10 
11 #include <filesystem>
12 #include <fstream>
13 #include <iostream>
14 
15 namespace fs = std::filesystem;
16 
17 using Json = nlohmann::json;
18 
19 // Priority for a particular LED needs to stay SAME across all groups
20 // phosphor::led::Layout::Action can only be one of `Blink` and `On`
21 using PriorityMap =
22     std::unordered_map<std::string, phosphor::led::Layout::Action>;
23 
24 /** @brief Parse LED JSON file and output Json object
25  *
26  *  @param[in] path - path of LED JSON file
27  *
28  *  @return const Json - Json object
29  */
30 Json readJson(const fs::path& path)
31 {
32     if (!fs::exists(path) || fs::is_empty(path))
33     {
34         lg2::error("Incorrect File Path or empty file, FILE_PATH = {PATH}",
35                    "PATH", path);
36         throw std::runtime_error("Incorrect File Path or empty file");
37     }
38 
39     try
40     {
41         std::ifstream jsonFile(path);
42         return Json::parse(jsonFile);
43     }
44     catch (const std::exception& e)
45     {
46         lg2::error(
47             "Failed to parse config file, ERROR = {ERROR}, FILE_PATH = {PATH}",
48             "ERROR", e, "PATH", path);
49         throw std::runtime_error("Failed to parse config file");
50     }
51 }
52 
53 /** @brief Returns action enum based on string
54  *
55  *  @param[in] action - action string
56  *
57  *  @return Action - action enum (On/Blink)
58  */
59 phosphor::led::Layout::Action getAction(const std::string& action)
60 {
61     assert(action == "On" || action == "Blink");
62 
63     return action == "Blink" ? phosphor::led::Layout::Action::Blink
64                              : phosphor::led::Layout::Action::On;
65 }
66 
67 /** @brief Validate the Priority of an LED is same across ALL groups
68  *
69  *  @param[in] name - led name member of each group
70  *  @param[in] priority - member priority of each group
71  *  @param[out] priorityMap - std::unordered_map, key:name, value:priority
72  *
73  *  @return
74  */
75 void validatePriority(const std::string& name,
76                       const phosphor::led::Layout::Action& priority,
77                       PriorityMap& priorityMap)
78 {
79     auto iter = priorityMap.find(name);
80     if (iter == priorityMap.end())
81     {
82         priorityMap.emplace(name, priority);
83         return;
84     }
85 
86     if (iter->second != priority)
87     {
88         lg2::error(
89             "Priority of LED is not same across all, Name = {NAME}, Old Priority = {OLD_PRIO}, New Priority = {NEW_PRIO}",
90             "NAME", name, "OLD_PRIO", int(iter->second), "NEW_PRIO",
91             int(priority));
92 
93         throw std::runtime_error(
94             "Priority of at least one LED is not same across groups");
95     }
96 }
97 
98 /** @brief Load JSON config and return led map (JSON version 1)
99  *
100  *  @return phosphor::led::GroupMap
101  */
102 const phosphor::led::GroupMap loadJsonConfigV1(const Json& json)
103 {
104     phosphor::led::GroupMap ledMap{};
105     PriorityMap priorityMap{};
106 
107     // define the default JSON as empty
108     const Json empty{};
109     auto leds = json.value("leds", empty);
110 
111     for (const auto& entry : leds)
112     {
113         fs::path tmpPath("/xyz/openbmc_project/led/groups");
114         tmpPath /= entry.value("group", "");
115         auto objpath = tmpPath.string();
116         auto members = entry.value("members", empty);
117 
118         phosphor::led::ActionSet ledActions{};
119         for (const auto& member : members)
120         {
121             auto name = member.value("Name", "");
122             auto action = getAction(member.value("Action", ""));
123             uint8_t dutyOn = member.value("DutyOn", 50);
124             uint16_t period = member.value("Period", 0);
125 
126             // Since only have Blink/On and default priority is Blink
127             auto priority = getAction(member.value("Priority", "Blink"));
128 
129             // Same LEDs can be part of multiple groups. However, their
130             // priorities across groups need to match.
131             validatePriority(name, priority, priorityMap);
132 
133             phosphor::led::Layout::LedAction ledAction{name, action, dutyOn,
134                                                        period, priority};
135             ledActions.emplace(ledAction);
136         }
137 
138         // Generated an std::unordered_map of LedGroupNames to std::set of LEDs
139         // containing the name and properties.
140         ledMap.emplace(objpath, ledActions);
141     }
142 
143     return ledMap;
144 }
145 
146 /** @brief Load JSON config and return led map
147  *
148  *  @return phosphor::led::GroupMap
149  */
150 const phosphor::led::GroupMap loadJsonConfig(const fs::path& path)
151 {
152     auto json = readJson(path);
153 
154     auto version = json.value("version", 1);
155     switch (version)
156     {
157         case 1:
158             return loadJsonConfigV1(json);
159 
160         default:
161             lg2::error("Unsupported JSON Version: {VERSION}", "VERSION",
162                        version);
163             throw std::runtime_error("Unsupported version");
164     }
165 
166     return phosphor::led::GroupMap{};
167 }
168 
169 /** @brief Get led map from LED groups JSON config
170  *
171  *  @param[in] config - Path to the JSON config.
172  *  @return phosphor::led::GroupMap
173  *
174  *  @note if config is an empty string, daemon will interrogate dbus for
175  *        compatible strings.
176  */
177 const phosphor::led::GroupMap getSystemLedMap(fs::path config)
178 {
179     if (config.empty())
180     {
181         config = phosphor::led::getJsonConfig();
182     }
183 
184     return loadJsonConfig(config);
185 }
186