1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
// Copyright (c) 2019 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#pragma once
constexpr const char *prefix = "/var/lib/phosphor-settings-manager/settings";
// because some paths collide with others
// i.e. /xyz/openbmc_project/host collides with /xyz/openbmc/host/foo
constexpr const char *trail = "_";
#include "utils.hpp"
#include <fstream>
#include <iostream>
#include <stdexcept>
#include <filesystem>
#include <nlohmann/json.hpp>
#include <sdbusplus/asio/connection.hpp>
#include <sdbusplus/asio/object_server.hpp>
struct SettingsInterface
{
SettingsInterface(sdbusplus::asio::object_server &objectServer,
const std::string &objectPath, const std::string &iface) :
objectServer(objectServer),
path(std::make_shared<std::string>(objectPath + trail))
{
interface = objectServer.add_interface(objectPath, iface);
}
~SettingsInterface()
{
objectServer.remove_interface(interface);
}
template <typename T>
std::optional<T> getOptional(const nlohmann::json &data)
{
std::optional<T> resp;
if constexpr (std::is_floating_point_v<T>)
{
const double *val = data.get_ptr<const double *>();
if (val != nullptr)
{
resp = *val;
}
return resp;
}
else if constexpr (std::is_same_v<bool, std::decay_t<T>>)
{
const bool *val = data.get_ptr<const bool *>();
if (val != nullptr)
{
resp = *val;
}
return resp;
}
else if constexpr (std::is_unsigned_v<T>)
{
const uint64_t *val = data.get_ptr<const uint64_t *>();
if (val != nullptr)
{
resp = *val;
}
return resp;
}
else if constexpr (std::is_signed_v<T>)
{
const int64_t *val = data.get_ptr<const int64_t *>();
if (val != nullptr)
{
resp = *val;
}
return resp;
}
else if constexpr (is_vector_v<T>)
{
resp = {};
for (const auto &val : data)
{
using SubType = typename T::value_type;
std::optional<SubType> opt = getOptional<SubType>(val);
if (!opt)
{
return std::optional<T>(std::nullopt);
}
resp->emplace_back(*opt);
}
return resp;
}
else if constexpr (std::is_same_v<std::string, std::decay_t<T>>)
{
const std::string *val = data.get_ptr<const std::string *>();
if (val != nullptr)
{
resp = *val;
}
return resp;
}
else
{
static_assert(!std::is_same_v<T, T>, "Unsupported Type");
}
}
// specialization for char * as std::string is the nlohmann type
void addProperty(const std::string &name, const char *value,
const bool persist = true)
{
addProperty(name, std::string(value), persist);
}
template <typename T>
void addProperty(const std::string &name, T value,
const bool persist = true)
{
std::ifstream current(std::string(prefix) + *path);
if (current.good())
{
nlohmann::json data =
nlohmann::json::parse(current, nullptr, false);
if (data.is_discarded())
{
std::cerr << "Persisted data at " << *path << " corrupted\n";
}
else
{
auto find = data.find(name);
if (find != data.end())
{
auto val = getOptional<T>(*find);
if (!val)
{
std::cerr << "Persisted data at " << *path
<< " corrupted, type changed for " << name
<< "\n";
}
else
{
value = *val;
}
}
}
}
interface->register_property(
name, value,
[path = std::shared_ptr<std::string>(path), name,
persist](const T &req, T &old) {
nlohmann::json data;
{ // context is here for raii to close the file
std::ifstream current(std::string(prefix) + *path);
if (current.good())
{
data = nlohmann::json::parse(current, nullptr, false);
if (data.is_discarded())
{
std::cerr << "Persisted data at " << *path
<< " corrupted\n";
throw std::runtime_error("Persisting Error");
}
}
}
if (persist)
{
data[name] = req;
std::filesystem::create_directories(
std::filesystem::path(std::string(prefix) + *path)
.parent_path());
std::ofstream output(std::string(prefix) + *path);
if (!output.good())
{
std::cerr << "Cannot write data at " << *path << "\n";
throw std::runtime_error("Persisting Error");
}
output << data;
}
old = req;
return 1;
});
}
void initialize()
{
interface->initialize();
}
sdbusplus::asio::object_server &objectServer;
std::shared_ptr<std::string> path; // shared ptr so this object can be moved
std::shared_ptr<sdbusplus::asio::dbus_interface> interface;
};
|
