9352252904

Committed 03 Jun 2024 02:41PM UTC coverage: 82.751%. Remained the same

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Merge pull request #1475 from evoskuil/master

Use block_success in header validation, comments, style.

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/src/chain/header.cpp

/**
 * Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS)
 *
 * This file is part of libbitcoin.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <bitcoin/system/chain/header.hpp>

#include <chrono>
#include <utility>
#include <bitcoin/system/chain/chain_state.hpp>
#include <bitcoin/system/chain/compact.hpp>
#include <bitcoin/system/data/data.hpp>
#include <bitcoin/system/define.hpp>
#include <bitcoin/system/hash/hash.hpp>
#include <bitcoin/system/error/error.hpp>
#include <bitcoin/system/stream/stream.hpp>

namespace libbitcoin {
namespace system {
namespace chain {

// Use system clock because we require accurate time of day.
using wall_clock = std::chrono::system_clock;

// Constructors.
// ----------------------------------------------------------------------------

header::header() NOEXCEPT
  : header(0, {}, {}, 0, 0, 0, false)
{
}

header::header(uint32_t version, hash_digest&& previous_block_hash,
    hash_digest&& merkle_root, uint32_t timestamp, uint32_t bits,
    uint32_t nonce) NOEXCEPT
  : header(version, std::move(previous_block_hash), std::move(merkle_root),
      timestamp, bits, nonce, true)
{
}

header::header(uint32_t version, const hash_digest& previous_block_hash,
    const hash_digest& merkle_root, uint32_t timestamp, uint32_t bits,
    uint32_t nonce) NOEXCEPT
  : header(version, previous_block_hash, merkle_root, timestamp, bits, nonce,
      true)
{
}

header::header(const data_slice& data) NOEXCEPT
    BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
  : header(stream::in::copy(data))
    BC_POP_WARNING()
{
}

////header::header(stream::in::fast&& stream) NOEXCEPT
////  : header(read::bytes::fast(stream))
////{
////}

header::header(stream::in::fast& stream) NOEXCEPT
  : header(read::bytes::fast(stream))
{
}

header::header(std::istream&& stream) NOEXCEPT
  : header(read::bytes::istream(stream))
{
}

header::header(std::istream& stream) NOEXCEPT
  : header(read::bytes::istream(stream))
{
}

header::header(reader&& source) NOEXCEPT
  : header(from_data(source))
{
}

header::header(reader& source) NOEXCEPT
  : header(from_data(source))
{
}

// protected
header::header(uint32_t version, hash_digest&& previous_block_hash,
    hash_digest&& merkle_root, uint32_t timestamp, uint32_t bits,
    uint32_t nonce, bool valid) NOEXCEPT
  : version_(version),
    previous_block_hash_(std::move(previous_block_hash)),
    merkle_root_(std::move(merkle_root)),
    timestamp_(timestamp),
    bits_(bits),
    nonce_(nonce),
    valid_(valid)
{
}

// protected
header::header(uint32_t version, const hash_digest& previous_block_hash,
    const hash_digest& merkle_root, uint32_t timestamp, uint32_t bits,
    uint32_t nonce, bool valid) NOEXCEPT
  : version_(version),
    previous_block_hash_(previous_block_hash),
    merkle_root_(merkle_root),
    timestamp_(timestamp),
    bits_(bits),
    nonce_(nonce),
    valid_(valid)
{
}

// Operators.
// ----------------------------------------------------------------------------

bool header::operator==(const header& other) const NOEXCEPT
{
    return (version_ == other.version_)
        && (previous_block_hash_ == other.previous_block_hash_)
        && (merkle_root_ == other.merkle_root_)
        && (timestamp_ == other.timestamp_)
        && (bits_ == other.bits_)
        && (nonce_ == other.nonce_);
}

bool header::operator!=(const header& other) const NOEXCEPT
{
    return !(*this == other);
}

// Deserialization.
// ----------------------------------------------------------------------------

// static/private
header header::from_data(reader& source) NOEXCEPT
{
    return
    {
        source.read_4_bytes_little_endian(),
        source.read_hash(),
        source.read_hash(),
        source.read_4_bytes_little_endian(),
        source.read_4_bytes_little_endian(),
        source.read_4_bytes_little_endian(),
        source
    };
}

// Serialization.
// ----------------------------------------------------------------------------

data_chunk header::to_data() const NOEXCEPT
{
    data_chunk data(serialized_size());

    BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
    stream::out::copy ostream(data);
    BC_POP_WARNING()

    to_data(ostream);
    return data;
}

void header::to_data(std::ostream& stream) const NOEXCEPT
{
    write::bytes::ostream out(stream);
    to_data(out);
}

void header::to_data(writer& sink) const NOEXCEPT
{
    sink.write_4_bytes_little_endian(version_);
    sink.write_bytes(previous_block_hash_);
    sink.write_bytes(merkle_root_);
    sink.write_4_bytes_little_endian(timestamp_);
    sink.write_4_bytes_little_endian(bits_);
    sink.write_4_bytes_little_endian(nonce_);
}

// Properties.
// ----------------------------------------------------------------------------

bool header::is_valid() const NOEXCEPT
{
    return valid_;
}

uint32_t header::version() const NOEXCEPT
{
    return version_;
}

const hash_digest& header::previous_block_hash() const NOEXCEPT
{
    return previous_block_hash_;
}

const hash_digest& header::merkle_root() const NOEXCEPT
{
    return merkle_root_;
}

uint32_t header::timestamp() const NOEXCEPT
{
    return timestamp_;
}

uint32_t header::bits() const NOEXCEPT
{
    return bits_;
}

uint32_t header::nonce() const NOEXCEPT
{
    return nonce_;
}

void header::set_hash(hash_digest&& hash) const NOEXCEPT
{
    hash_ = to_shared(std::move(hash));
}

// computed
hash_digest header::hash() const NOEXCEPT
{
    if (hash_)
        return *hash_;

    BC_PUSH_WARNING(LOCAL_VARIABLE_NOT_INITIALIZED)
    hash_digest digest;
    BC_POP_WARNING()

    stream::out::fast stream{ digest };
    hash::sha256x2::fast sink{ stream };
    to_data(sink);
    sink.flush();
    return digest;
}

// static
uint256_t header::proof(uint32_t bits) NOEXCEPT
{
    auto target = compact::expand(bits);

    //*************************************************************************
    // CONSENSUS: bits may be overflowed, which is guarded here.
    // A target of zero is disallowed so is useful as a sentinel value.
    //*************************************************************************
    if (is_zero(target))
        return target;

    //*************************************************************************
    // CONSENSUS: If target is (2^256)-1, division would fail, however compact
    // compression is lossy, and therefore unable to produce negative one.
    //*************************************************************************

    // We need to compute 2**256 / (target + 1), but we can't represent 2**256
    // as it's too large for uint256. However as 2**256 is at least as large as
    // target + 1, it is equal to ((2**256 - target - 1) / (target + 1)) + 1, or
    // (~target / (target + 1)) + 1.
    return ++(~target / (target + one));
}

// computed
uint256_t header::proof() const NOEXCEPT
{
    // Returns zero if bits_ mantissa is less than one or bits_ is overflowed.
    return proof(bits_);
}

// Check.
// ----------------------------------------------------------------------------

bool header::is_invalid_proof_of_work(uint32_t proof_of_work_limit,
    bool scrypt) const NOEXCEPT
{
    static const auto limit = compact::expand(proof_of_work_limit);
    const auto target = compact::expand(bits_);

    //*************************************************************************
    // CONSENSUS: bits_ may be overflowed, which is guarded here.
    // A target of zero is disallowed so is useful as a sentinel value.
    //*************************************************************************
    if (is_zero(target))
        return true;

    // Ensure claimed work is at or above minimum (less is more).
    if (target > limit)
        return true;

    // Conditionally use scrypt proof of work (e.g. Litecoin).
    return to_uintx(scrypt ? scrypt_hash(to_data()) : hash()) > target;
}

// ****************************************************************************
// CONSENSUS: bitcoin 32bit unix time: en.wikipedia.org/wiki/Year_2038_problem
// ****************************************************************************
bool header::is_invalid_timestamp(
    uint32_t timestamp_limit_seconds) const NOEXCEPT
{
    using namespace std::chrono;
    static const auto two_hours = seconds(timestamp_limit_seconds);
    const auto time = wall_clock::from_time_t(timestamp_);
    const auto future = wall_clock::now() + two_hours;
    return time > future;
}

// Validation.
// ----------------------------------------------------------------------------

code header::check(uint32_t timestamp_limit_seconds,
    uint32_t proof_of_work_limit, bool scrypt) const NOEXCEPT
{
    if (is_invalid_proof_of_work(proof_of_work_limit, scrypt))
        return error::invalid_proof_of_work;
    if (is_invalid_timestamp(timestamp_limit_seconds))
        return error::futuristic_timestamp;

    return error::block_success;
}

// minimum_block_version
// median_time_past
// work_required

// Checkpoints and previous_block_hash are chain validation (not here).
// bits_ below is the consensus direct comparison of the header.bits value.
// All other work comparisons performed on expanded/normalized bits values.
code header::accept(const context& ctx) const NOEXCEPT
{
    if (version_ < ctx.minimum_block_version)
        return error::invalid_block_version;
    if (timestamp_ <= ctx.median_time_past)
        return error::timestamp_too_early;
    if (bits_ != ctx.work_required)
        return error::incorrect_proof_of_work;

    return error::block_success;
}

// JSON value convertors.
// ----------------------------------------------------------------------------

namespace json = boost::json;

// boost/json will soon have NOEXCEPT: github.com/boostorg/json/pull/636
BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)

header tag_invoke(json::value_to_tag<header>,
    const json::value& value) NOEXCEPT
{
    hash_digest previous, merkle_root;
    if (!decode_hash(previous, value.at("previous").get_string().c_str()) ||
        !decode_hash(merkle_root, value.at("merkle_root").get_string().c_str()))
        return {};

    return
    {
        value.at("version").to_number<uint32_t>(),
        previous,
        merkle_root,
        value.at("timestamp").to_number<uint32_t>(),
        value.at("bits").to_number<uint32_t>(),
        value.at("nonce").to_number<uint32_t>()
    };
}

void tag_invoke(json::value_from_tag, json::value& value,
    const header& tx) NOEXCEPT
{
    value =
    {
        { "version", tx.version() },
        { "previous", encode_hash(tx.previous_block_hash()) },
        { "merkle_root", encode_hash(tx.merkle_root()) },
        { "timestamp", tx.timestamp() },
        { "bits", tx.bits() },
        { "nonce", tx.nonce() }
    };
}

BC_POP_WARNING()

header::cptr tag_invoke(json::value_to_tag<header::cptr>,
    const json::value& value) NOEXCEPT
{
    return to_shared(tag_invoke(json::value_to_tag<header>{}, value));
}

// Shared pointer overload is required for navigation.
BC_PUSH_WARNING(SMART_PTR_NOT_NEEDED)
BC_PUSH_WARNING(NO_VALUE_OR_CONST_REF_SHARED_PTR)

void tag_invoke(json::value_from_tag tag, json::value& value,
    const header::cptr& tx) NOEXCEPT
{
    tag_invoke(tag, value, *tx);
}

BC_POP_WARNING()
BC_POP_WARNING()

} // namespace chain
} // namespace system
} // namespace libbitcoin

1	/**
2	* Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS)
3	*
4	* This file is part of libbitcoin.
5	*
6	* This program is free software: you can redistribute it and/or modify
7	* it under the terms of the GNU Affero General Public License as published by
8	* the Free Software Foundation, either version 3 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU Affero General Public License for more details.
15	*
16	* You should have received a copy of the GNU Affero General Public License
17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
18	*/
19	#include <bitcoin/system/chain/header.hpp>
20
21	#include <chrono>
22	#include <utility>
23	#include <bitcoin/system/chain/chain_state.hpp>
24	#include <bitcoin/system/chain/compact.hpp>
25	#include <bitcoin/system/data/data.hpp>
26	#include <bitcoin/system/define.hpp>
27	#include <bitcoin/system/hash/hash.hpp>
28	#include <bitcoin/system/error/error.hpp>
29	#include <bitcoin/system/stream/stream.hpp>
30
31	namespace libbitcoin {
32	namespace system {
33	namespace chain {
34
35	// Use system clock because we require accurate time of day.
36	using wall_clock = std::chrono::system_clock;
37
38	// Constructors.
39	// ----------------------------------------------------------------------------
40
41	header::header() NOEXCEPT	74✔
42	: header(0, {}, {}, 0, 0, 0, false)	74✔
43	{
44	}	74✔
45
46	header::header(uint32_t version, hash_digest&& previous_block_hash,	8✔
47	hash_digest&& merkle_root, uint32_t timestamp, uint32_t bits,
48	uint32_t nonce) NOEXCEPT
49	: header(version, std::move(previous_block_hash), std::move(merkle_root),
50	timestamp, bits, nonce, true)
51	{
52	}	8✔
53
54	header::header(uint32_t version, const hash_digest& previous_block_hash,	8✔
55	const hash_digest& merkle_root, uint32_t timestamp, uint32_t bits,
56	uint32_t nonce) NOEXCEPT
57	: header(version, previous_block_hash, merkle_root, timestamp, bits, nonce,
58	true)
59	{
60	}	6✔
61
62	header::header(const data_slice& data) NOEXCEPT	1✔
63	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
64	: header(stream::in::copy(data))	1✔
65	BC_POP_WARNING()
66	{
67	}	1✔
68
69	////header::header(stream::in::fast&& stream) NOEXCEPT
70	//// : header(read::bytes::fast(stream))
71	////{
72	////}
73
74	header::header(stream::in::fast& stream) NOEXCEPT	1✔
75	: header(read::bytes::fast(stream))	1✔
76	{
77	}	1✔
78
79	header::header(std::istream&& stream) NOEXCEPT	1✔
80	: header(read::bytes::istream(stream))	1✔
81	{
82	}	1✔
83
84	header::header(std::istream& stream) NOEXCEPT	3✔
85	: header(read::bytes::istream(stream))	3✔
86	{
87	}	3✔
88
89	header::header(reader&& source) NOEXCEPT	5✔
90	: header(from_data(source))	5✔
91	{
92	}	5✔
93
94	header::header(reader& source) NOEXCEPT	77✔
95	: header(from_data(source))	77✔
96	{
97	}	77✔
98
99	// protected
100	header::header(uint32_t version, hash_digest&& previous_block_hash,	164✔
101	hash_digest&& merkle_root, uint32_t timestamp, uint32_t bits,
102	uint32_t nonce, bool valid) NOEXCEPT	82✔
103	: version_(version),	164✔
104	previous_block_hash_(std::move(previous_block_hash)),	8✔
105	merkle_root_(std::move(merkle_root)),	164✔
106	timestamp_(timestamp),	164✔
107	bits_(bits),	164✔
108	nonce_(nonce),	164✔
109	valid_(valid)	164✔
110	{
111	}	×
112
113	// protected
114	header::header(uint32_t version, const hash_digest& previous_block_hash,	8✔
115	const hash_digest& merkle_root, uint32_t timestamp, uint32_t bits,
116	uint32_t nonce, bool valid) NOEXCEPT	6✔
117	: version_(version),	8✔
118	previous_block_hash_(previous_block_hash),	8✔
119	merkle_root_(merkle_root),	8✔
120	timestamp_(timestamp),	8✔
121	bits_(bits),	8✔
122	nonce_(nonce),	8✔
123	valid_(valid)	2✔
124	{
125	}	×
126
127	// Operators.
128	// ----------------------------------------------------------------------------
129
130	bool header::operator==(const header& other) const NOEXCEPT	27✔
131	{
132	return (version_ == other.version_)	27✔
133	&& (previous_block_hash_ == other.previous_block_hash_)	20✔
134	&& (merkle_root_ == other.merkle_root_)	20✔
135	&& (timestamp_ == other.timestamp_)	20✔
136	&& (bits_ == other.bits_)
137	&& (nonce_ == other.nonce_);	47✔
138	}
139
140	bool header::operator!=(const header& other) const NOEXCEPT	2✔
141	{
142	return !(*this == other);	2✔
143	}
144
145	// Deserialization.
146	// ----------------------------------------------------------------------------
147
148	// static/private
149	header header::from_data(reader& source) NOEXCEPT	82✔
150	{
151	return	82✔
152	{
153	source.read_4_bytes_little_endian(),	82✔
154	source.read_hash(),	82✔
155	source.read_hash(),	82✔
156	source.read_4_bytes_little_endian(),	82✔
157	source.read_4_bytes_little_endian(),	82✔
158	source.read_4_bytes_little_endian(),	82✔
159	source
160	};	164✔
161	}
162
163	// Serialization.
164	// ----------------------------------------------------------------------------
165
166	data_chunk header::to_data() const NOEXCEPT	7✔
167	{
168	data_chunk data(serialized_size());	7✔
169
170	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
171	stream::out::copy ostream(data);	7✔
172	BC_POP_WARNING()
173
174	to_data(ostream);	7✔
175	return data;	14✔
176	}	7✔
177
178	void header::to_data(std::ostream& stream) const NOEXCEPT	8✔
179	{
180	write::bytes::ostream out(stream);	8✔
181	to_data(out);	8✔
182	}	8✔
183
184	void header::to_data(writer& sink) const NOEXCEPT	76✔
185	{
186	sink.write_4_bytes_little_endian(version_);	76✔
187	sink.write_bytes(previous_block_hash_);	76✔
188	sink.write_bytes(merkle_root_);	76✔
189	sink.write_4_bytes_little_endian(timestamp_);	76✔
190	sink.write_4_bytes_little_endian(bits_);	76✔
191	sink.write_4_bytes_little_endian(nonce_);	76✔
192	}	76✔
193
194	// Properties.
195	// ----------------------------------------------------------------------------
196
197	bool header::is_valid() const NOEXCEPT	11✔
198	{
199	return valid_;	11✔
200	}
201
202	uint32_t header::version() const NOEXCEPT	6✔
203	{
204	return version_;	4✔
205	}
206
207	const hash_digest& header::previous_block_hash() const NOEXCEPT	6✔
208	{
209	return previous_block_hash_;	6✔
210	}
211
212	const hash_digest& header::merkle_root() const NOEXCEPT	17✔
213	{
214	return merkle_root_;	17✔
215	}
216
217	uint32_t header::timestamp() const NOEXCEPT	6✔
218	{
219	return timestamp_;	4✔
220	}
221
222	uint32_t header::bits() const NOEXCEPT	6✔
223	{
224	return bits_;	4✔
225	}
226
227	uint32_t header::nonce() const NOEXCEPT	6✔
228	{
229	return nonce_;	4✔
230	}
231
232	void header::set_hash(hash_digest&& hash) const NOEXCEPT	×
233	{
234	hash_ = to_shared(std::move(hash));	×
235	}	×
236
237	// computed
238	hash_digest header::hash() const NOEXCEPT	39✔
239	{
240	if (hash_)	39✔
241	return *hash_;	×
242
243	BC_PUSH_WARNING(LOCAL_VARIABLE_NOT_INITIALIZED)
244	hash_digest digest;	39✔
245	BC_POP_WARNING()
246
247	stream::out::fast stream{ digest };	39✔
248	hash::sha256x2::fast sink{ stream };	39✔
249	to_data(sink);	39✔
250	sink.flush();	39✔
251	return digest;	39✔
252	}	39✔
253
254	// static
255	uint256_t header::proof(uint32_t bits) NOEXCEPT	1✔
256	{
257	auto target = compact::expand(bits);	1✔
258
259	//*************************************************************************
260	// CONSENSUS: bits may be overflowed, which is guarded here.
261	// A target of zero is disallowed so is useful as a sentinel value.
262	//*************************************************************************
263	if (is_zero(target))	1✔
264	return target;	×
265
266	//*************************************************************************
267	// CONSENSUS: If target is (2^256)-1, division would fail, however compact
268	// compression is lossy, and therefore unable to produce negative one.
269	//*************************************************************************
270
271	// We need to compute 2256 / (target + 1), but we can't represent 2256
272	// as it's too large for uint256. However as 2**256 is at least as large as
273	// target + 1, it is equal to ((2**256 - target - 1) / (target + 1)) + 1, or
274	// (~target / (target + 1)) + 1.
275	return ++(~target / (target + one));	2✔
276	}
277
278	// computed
279	uint256_t header::proof() const NOEXCEPT	1✔
280	{
281	// Returns zero if bits_ mantissa is less than one or bits_ is overflowed.
282	return proof(bits_);	1✔
283	}
284
285	// Check.
286	// ----------------------------------------------------------------------------
287
288	bool header::is_invalid_proof_of_work(uint32_t proof_of_work_limit,	6✔
289	bool scrypt) const NOEXCEPT
290	{
291	static const auto limit = compact::expand(proof_of_work_limit);	6✔
292	const auto target = compact::expand(bits_);	6✔
293
294	//*************************************************************************
295	// CONSENSUS: bits_ may be overflowed, which is guarded here.
296	// A target of zero is disallowed so is useful as a sentinel value.
297	//*************************************************************************
298	if (is_zero(target))	6✔
299	return true;
300
301	// Ensure claimed work is at or above minimum (less is more).
302	if (target > limit)	5✔
303	return true;
304
305	// Conditionally use scrypt proof of work (e.g. Litecoin).
306	return to_uintx(scrypt ? scrypt_hash(to_data()) : hash()) > target;	10✔
307	}
308
309	// ****************************************************************************
310	// CONSENSUS: bitcoin 32bit unix time: en.wikipedia.org/wiki/Year_2038_problem
311	// ****************************************************************************
312	bool header::is_invalid_timestamp(	2✔
313	uint32_t timestamp_limit_seconds) const NOEXCEPT
314	{
315	using namespace std::chrono;	2✔
316	static const auto two_hours = seconds(timestamp_limit_seconds);	2✔
317	const auto time = wall_clock::from_time_t(timestamp_);	2✔
318	const auto future = wall_clock::now() + two_hours;	2✔
319	return time > future;	2✔
320	}
321
322	// Validation.
323	// ----------------------------------------------------------------------------
324
325	code header::check(uint32_t timestamp_limit_seconds,	×
326	uint32_t proof_of_work_limit, bool scrypt) const NOEXCEPT
327	{
328	if (is_invalid_proof_of_work(proof_of_work_limit, scrypt))	×
329	return error::invalid_proof_of_work;	×
330	if (is_invalid_timestamp(timestamp_limit_seconds))	×
331	return error::futuristic_timestamp;	×
332
NEW 333	return error::block_success;	×
334	}
335
336	// minimum_block_version
337	// median_time_past
338	// work_required
339
340	// Checkpoints and previous_block_hash are chain validation (not here).
341	// bits_ below is the consensus direct comparison of the header.bits value.
342	// All other work comparisons performed on expanded/normalized bits values.
343	code header::accept(const context& ctx) const NOEXCEPT	×
344	{
345	if (version_ < ctx.minimum_block_version)	×
346	return error::invalid_block_version;	×
347	if (timestamp_ <= ctx.median_time_past)	×
348	return error::timestamp_too_early;	×
349	if (bits_ != ctx.work_required)	×
350	return error::incorrect_proof_of_work;	×
351
NEW 352	return error::block_success;	×
353	}
354
355	// JSON value convertors.
356	// ----------------------------------------------------------------------------
357
358	namespace json = boost::json;
359
360	// boost/json will soon have NOEXCEPT: github.com/boostorg/json/pull/636
361	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
362
363	header tag_invoke(json::value_to_tag<header>,	2✔
364	const json::value& value) NOEXCEPT
365	{
366	hash_digest previous, merkle_root;	2✔
367	if (!decode_hash(previous, value.at("previous").get_string().c_str()) \|\|	4✔
368	!decode_hash(merkle_root, value.at("merkle_root").get_string().c_str()))	2✔
369	return {};	×
370
371	return	2✔
372	{
373	value.at("version").to_number<uint32_t>(),	2✔
374	previous,
375	merkle_root,
376	value.at("timestamp").to_number<uint32_t>(),	2✔
377	value.at("bits").to_number<uint32_t>(),	2✔
378	value.at("nonce").to_number<uint32_t>()	4✔
379	};	8✔
380	}
381
382	void tag_invoke(json::value_from_tag, json::value& value,	4✔
383	const header& tx) NOEXCEPT
384	{
385	value =	16✔
386	{
387	{ "version", tx.version() },
388	{ "previous", encode_hash(tx.previous_block_hash()) },	4✔
389	{ "merkle_root", encode_hash(tx.merkle_root()) },	8✔
390	{ "timestamp", tx.timestamp() },
391	{ "bits", tx.bits() },
392	{ "nonce", tx.nonce() }
393	};	4✔
394	}	4✔
395
396	BC_POP_WARNING()
397
398	header::cptr tag_invoke(json::value_to_tag<header::cptr>,	×
399	const json::value& value) NOEXCEPT
400	{
401	return to_shared(tag_invoke(json::value_to_tag<header>{}, value));	×
402	}
403
404	// Shared pointer overload is required for navigation.
405	BC_PUSH_WARNING(SMART_PTR_NOT_NEEDED)
406	BC_PUSH_WARNING(NO_VALUE_OR_CONST_REF_SHARED_PTR)
407
408	void tag_invoke(json::value_from_tag tag, json::value& value,	×
409	const header::cptr& tx) NOEXCEPT
410	{
411	tag_invoke(tag, value, *tx);	×
412	}	×
413
414	BC_POP_WARNING()
415	BC_POP_WARNING()
416
417	} // namespace chain
418	} // namespace system
419	} // namespace libbitcoin

libbitcoin / libbitcoin-system / 9352252904

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