File: Message.h

package info (click to toggle)
sdbus-cpp 0.8.3-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,184 kB
  • sloc: cpp: 9,207; xml: 160; ansic: 115; makefile: 22
file content (408 lines) | stat: -rw-r--r-- 12,140 bytes parent folder | download | duplicates (3)
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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
/**
 * (C) 2016 - 2017 KISTLER INSTRUMENTE AG, Winterthur, Switzerland
 * (C) 2016 - 2019 Stanislav Angelovic <angelovic.s@gmail.com>
 *
 * @file Message.h
 *
 * Created on: Nov 9, 2016
 * Project: sdbus-c++
 * Description: High-level D-Bus IPC C++ library based on sd-bus
 *
 * This file is part of sdbus-c++.
 *
 * sdbus-c++ is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * sdbus-c++ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with sdbus-c++. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef SDBUS_CXX_MESSAGE_H_
#define SDBUS_CXX_MESSAGE_H_

#include <sdbus-c++/TypeTraits.h>
#include <sdbus-c++/Error.h>
#include <string>
#include <vector>
#include <map>
#include <memory>
#include <utility>
#include <cstdint>
#include <cassert>
#include <functional>

// Forward declarations
namespace sdbus {
    class Variant;
    class ObjectPath;
    class Signature;
    template <typename... _ValueTypes> class Struct;
    class UnixFd;
    class MethodReply;
    namespace internal {
        class ISdBus;
    }
}

namespace sdbus {

    // Assume the caller has already obtained message ownership
    struct adopt_message_t { explicit adopt_message_t() = default; };
    inline constexpr adopt_message_t adopt_message{};

    /********************************************//**
     * @class Message
     *
     * Message represents a D-Bus message, which can be either method call message,
     * method reply message, signal message, or a plain message serving as a storage
     * for serialized data.
     *
     * Serialization and deserialization functions are provided for types supported
     * by D-Bus.
     *
     * You don't need to work with this class directly if you use high-level APIs
     * of @c IObject and @c IProxy.
     *
     ***********************************************/
    class [[nodiscard]] Message
    {
    public:
        Message& operator<<(bool item);
        Message& operator<<(int16_t item);
        Message& operator<<(int32_t item);
        Message& operator<<(int64_t item);
        Message& operator<<(uint8_t item);
        Message& operator<<(uint16_t item);
        Message& operator<<(uint32_t item);
        Message& operator<<(uint64_t item);
        Message& operator<<(double item);
        Message& operator<<(const char *item);
        Message& operator<<(const std::string &item);
        Message& operator<<(const Variant &item);
        Message& operator<<(const ObjectPath &item);
        Message& operator<<(const Signature &item);
        Message& operator<<(const UnixFd &item);

        Message& operator>>(bool& item);
        Message& operator>>(int16_t& item);
        Message& operator>>(int32_t& item);
        Message& operator>>(int64_t& item);
        Message& operator>>(uint8_t& item);
        Message& operator>>(uint16_t& item);
        Message& operator>>(uint32_t& item);
        Message& operator>>(uint64_t& item);
        Message& operator>>(double& item);
        Message& operator>>(char*& item);
        Message& operator>>(std::string &item);
        Message& operator>>(Variant &item);
        Message& operator>>(ObjectPath &item);
        Message& operator>>(Signature &item);
        Message& operator>>(UnixFd &item);

        Message& openContainer(const std::string& signature);
        Message& closeContainer();
        Message& openDictEntry(const std::string& signature);
        Message& closeDictEntry();
        Message& openVariant(const std::string& signature);
        Message& closeVariant();
        Message& openStruct(const std::string& signature);
        Message& closeStruct();

        Message& enterContainer(const std::string& signature);
        Message& exitContainer();
        Message& enterDictEntry(const std::string& signature);
        Message& exitDictEntry();
        Message& enterVariant(const std::string& signature);
        Message& exitVariant();
        Message& enterStruct(const std::string& signature);
        Message& exitStruct();

        explicit operator bool() const;
        void clearFlags();

        std::string getInterfaceName() const;
        std::string getMemberName() const;
        std::string getSender() const;
        void peekType(std::string& type, std::string& contents) const;
        bool isValid() const;
        bool isEmpty() const;

        void copyTo(Message& destination, bool complete) const;
        void seal();
        void rewind(bool complete);

        class Factory;

    protected:
        Message() = default;
        explicit Message(internal::ISdBus* sdbus) noexcept;
        Message(void *msg, internal::ISdBus* sdbus) noexcept;
        Message(void *msg, internal::ISdBus* sdbus, adopt_message_t) noexcept;

        Message(const Message&) noexcept;
        Message& operator=(const Message&) noexcept;
        Message(Message&& other) noexcept;
        Message& operator=(Message&& other) noexcept;

        ~Message();

        friend Factory;

    protected:
        void* msg_{};
        internal::ISdBus* sdbus_{};
        mutable bool ok_{true};
    };

    struct dont_request_slot_t { explicit dont_request_slot_t() = default; };
    inline constexpr dont_request_slot_t dont_request_slot{};

    class MethodCall : public Message
    {
        using Message::Message;
        friend Factory;

    public:
        using Slot = std::unique_ptr<void, std::function<void(void*)>>;

        MethodCall() = default;

        MethodReply send(uint64_t timeout) const;
        void send(void* callback, void* userData, uint64_t timeout, dont_request_slot_t) const;
        [[nodiscard]] Slot send(void* callback, void* userData, uint64_t timeout) const;

        MethodReply createReply() const;
        MethodReply createErrorReply(const sdbus::Error& error) const;

        void dontExpectReply();
        bool doesntExpectReply() const;

    private:
        MethodReply sendWithReply(uint64_t timeout = 0) const;
        MethodReply sendWithNoReply() const;
    };

    class MethodReply : public Message
    {
        using Message::Message;
        friend Factory;

    public:
        MethodReply() = default;
        void send() const;
    };

    class Signal : public Message
    {
        using Message::Message;
        friend Factory;

    public:
        Signal() = default;
        void send() const;
    };

    class PropertySetCall : public Message
    {
        using Message::Message;
        friend Factory;

    public:
        PropertySetCall() = default;
    };

    class PropertyGetReply : public Message
    {
        using Message::Message;
        friend Factory;

    public:
        PropertyGetReply() = default;
    };

    class PlainMessage : public Message
    {
        using Message::Message;
        friend Factory;

    public:
        PlainMessage() = default;
    };

    template <typename _Element>
    inline Message& operator<<(Message& msg, const std::vector<_Element>& items)
    {
        msg.openContainer(signature_of<_Element>::str());

        for (const auto& item : items)
            msg << item;

        msg.closeContainer();

        return msg;
    }

    template <typename _Key, typename _Value>
    inline Message& operator<<(Message& msg, const std::map<_Key, _Value>& items)
    {
        const std::string dictEntrySignature = signature_of<_Key>::str() + signature_of<_Value>::str();
        const std::string arraySignature = "{" + dictEntrySignature + "}";

        msg.openContainer(arraySignature);

        for (const auto& item : items)
        {
            msg.openDictEntry(dictEntrySignature);
            msg << item.first;
            msg << item.second;
            msg.closeDictEntry();
        }

        msg.closeContainer();

        return msg;
    }

    namespace detail
    {
        template <typename... _Args>
        void serialize_pack(Message& msg, _Args&&... args)
        {
            (void)(msg << ... << args);
        }

        template <class _Tuple, std::size_t... _Is>
        void serialize_tuple( Message& msg
                            , const _Tuple& t
                            , std::index_sequence<_Is...>)
        {
            serialize_pack(msg, std::get<_Is>(t)...);
        }
    }

    template <typename... _ValueTypes>
    inline Message& operator<<(Message& msg, const Struct<_ValueTypes...>& item)
    {
        auto structSignature = signature_of<Struct<_ValueTypes...>>::str();
        assert(structSignature.size() > 2);
        // Remove opening and closing parenthesis from the struct signature to get contents signature
        auto structContentSignature = structSignature.substr(1, structSignature.size()-2);

        msg.openStruct(structContentSignature);
        detail::serialize_tuple(msg, item, std::index_sequence_for<_ValueTypes...>{});
        msg.closeStruct();

        return msg;
    }

    template <typename... _ValueTypes>
    inline Message& operator<<(Message& msg, const std::tuple<_ValueTypes...>& item)
    {
        detail::serialize_tuple(msg, item, std::index_sequence_for<_ValueTypes...>{});
        return msg;
    }


    template <typename _Element>
    inline Message& operator>>(Message& msg, std::vector<_Element>& items)
    {
        if(!msg.enterContainer(signature_of<_Element>::str()))
            return msg;

        while (true)
        {
            _Element elem;
            if (msg >> elem)
                items.emplace_back(std::move(elem));
            else
                break;
        }

        msg.clearFlags();

        msg.exitContainer();

        return msg;
    }

    template <typename _Key, typename _Value>
    inline Message& operator>>(Message& msg, std::map<_Key, _Value>& items)
    {
        const std::string dictEntrySignature = signature_of<_Key>::str() + signature_of<_Value>::str();
        const std::string arraySignature = "{" + dictEntrySignature + "}";

        if (!msg.enterContainer(arraySignature))
            return msg;

        while (true)
        {
            if (!msg.enterDictEntry(dictEntrySignature))
                break;

            _Key key;
            _Value value;
            msg >> key >> value;

            items.emplace(std::move(key), std::move(value));

            msg.exitDictEntry();
        }

        msg.clearFlags();

        msg.exitContainer();

        return msg;
    }

    namespace detail
    {
        template <typename... _Args>
        void deserialize_pack(Message& msg, _Args&... args)
        {
            (void)(msg >> ... >> args);
        }

        template <class _Tuple, std::size_t... _Is>
        void deserialize_tuple( Message& msg
                              , _Tuple& t
                              , std::index_sequence<_Is...> )
        {
            deserialize_pack(msg, std::get<_Is>(t)...);
        }
    }

    template <typename... _ValueTypes>
    inline Message& operator>>(Message& msg, Struct<_ValueTypes...>& item)
    {
        auto structSignature = signature_of<Struct<_ValueTypes...>>::str();
        // Remove opening and closing parenthesis from the struct signature to get contents signature
        auto structContentSignature = structSignature.substr(1, structSignature.size()-2);

        if (!msg.enterStruct(structContentSignature))
            return msg;

        detail::deserialize_tuple(msg, item, std::index_sequence_for<_ValueTypes...>{});

        msg.exitStruct();

        return msg;
    }

    template <typename... _ValueTypes>
    inline Message& operator>>(Message& msg, std::tuple<_ValueTypes...>& item)
    {
        detail::deserialize_tuple(msg, item, std::index_sequence_for<_ValueTypes...>{});
        return msg;
    }

}

#endif /* SDBUS_CXX_MESSAGE_H_ */