9879696031

Committed 10 Jul 2024 06:40PM UTC coverage: 82.863% (-0.01%) from 82.874%

Build # 9879696031

Build Type

Pull #1498

github

Committed by

web-flow

Commit Message

Merge 8a7dacadf into 155e5fae6

Pull Request Pull Request #1498: Optimizing deserializations (block, header, txs, point).

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80.72

/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(source/*from_data(source)*/)
{
}

header::header(reader& source) NOEXCEPT
  /*: header(from_data(source))*/
{
    assign_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
////    };
////}

// private
// This denormalization eliminates allocation and copy of 64 bytes per block.
void header::assign_data(reader& source) NOEXCEPT
{
    // Hashes are copied directly into to header-allocated space.
    // Integrals are stack-allocated and copied to header-allocated space.
    version_ = source.read_4_bytes_little_endian();
    source.read_bytes(previous_block_hash_.data(), hash_size);
    source.read_bytes(merkle_root_.data(), hash_size);
    timestamp_ = source.read_4_bytes_little_endian();
    bits_ = source.read_4_bytes_little_endian();
    nonce_ = source.read_4_bytes_little_endian();
    valid_ = 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;
}

const hash_digest& header::get_hash() const NOEXCEPT
{
    if (!hash_)
        set_hash(hash());

    return *hash_;
}

// 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(source/from_data(source)/)	5✔
91	{
UNCOV 92	}	×
93
94	header::header(reader& source) NOEXCEPT	84✔
95	/: header(from_data(source))/
96	{
97	assign_data(source);	84✔
98	}	84✔
99
100	// protected
101	header::header(uint32_t version, hash_digest&& previous_block_hash,	82✔
102	hash_digest&& merkle_root, uint32_t timestamp, uint32_t bits,
103	uint32_t nonce, bool valid) NOEXCEPT	82✔
104	: version_(version),	82✔
105	previous_block_hash_(std::move(previous_block_hash)),	82✔
106	merkle_root_(std::move(merkle_root)),	82✔
107	timestamp_(timestamp),	82✔
108	bits_(bits),	82✔
109	nonce_(nonce),	82✔
110	valid_(valid)	82✔
111	{
112	}	×
113
114	// protected
115	header::header(uint32_t version, const hash_digest& previous_block_hash,	8✔
116	const hash_digest& merkle_root, uint32_t timestamp, uint32_t bits,
117	uint32_t nonce, bool valid) NOEXCEPT	6✔
118	: version_(version),	8✔
119	previous_block_hash_(previous_block_hash),	8✔
120	merkle_root_(merkle_root),	8✔
121	timestamp_(timestamp),	8✔
122	bits_(bits),	8✔
123	nonce_(nonce),	8✔
124	valid_(valid)	2✔
125	{
126	}	×
127
128	// Operators.
129	// ----------------------------------------------------------------------------
130
131	bool header::operator==(const header& other) const NOEXCEPT	27✔
132	{
133	return (version_ == other.version_)	27✔
134	&& (previous_block_hash_ == other.previous_block_hash_)	20✔
135	&& (merkle_root_ == other.merkle_root_)	20✔
136	&& (timestamp_ == other.timestamp_)	20✔
137	&& (bits_ == other.bits_)
138	&& (nonce_ == other.nonce_);	47✔
139	}
140
141	bool header::operator!=(const header& other) const NOEXCEPT	2✔
142	{
143	return !(*this == other);	2✔
144	}
145
146	// Deserialization.
147	// ----------------------------------------------------------------------------
148
149	////// static/private
150	////header header::from_data(reader& source) NOEXCEPT
151	////{
152	//// return
153	//// {
154	//// source.read_4_bytes_little_endian(),
155	//// source.read_hash(),
156	//// source.read_hash(),
157	//// source.read_4_bytes_little_endian(),
158	//// source.read_4_bytes_little_endian(),
159	//// source.read_4_bytes_little_endian(),
160	//// source
161	//// };
162	////}
163
164	// private
165	// This denormalization eliminates allocation and copy of 64 bytes per block.
166	void header::assign_data(reader& source) NOEXCEPT	84✔
167	{
168	// Hashes are copied directly into to header-allocated space.
169	// Integrals are stack-allocated and copied to header-allocated space.
170	version_ = source.read_4_bytes_little_endian();	84✔
171	source.read_bytes(previous_block_hash_.data(), hash_size);	84✔
172	source.read_bytes(merkle_root_.data(), hash_size);	84✔
173	timestamp_ = source.read_4_bytes_little_endian();	84✔
174	bits_ = source.read_4_bytes_little_endian();	84✔
175	nonce_ = source.read_4_bytes_little_endian();	84✔
176	valid_ = source;	84✔
177	}	84✔
178
179	// Serialization.
180	// ----------------------------------------------------------------------------
181
182	data_chunk header::to_data() const NOEXCEPT	7✔
183	{
184	data_chunk data(serialized_size());	7✔
185
186	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
187	stream::out::copy ostream(data);	7✔
188	BC_POP_WARNING()
189
190	to_data(ostream);	7✔
191	return data;	14✔
192	}	7✔
193
194	void header::to_data(std::ostream& stream) const NOEXCEPT	8✔
195	{
196	write::bytes::ostream out(stream);	8✔
197	to_data(out);	8✔
198	}	8✔
199
200	void header::to_data(writer& sink) const NOEXCEPT	76✔
201	{
202	sink.write_4_bytes_little_endian(version_);	76✔
203	sink.write_bytes(previous_block_hash_);	76✔
204	sink.write_bytes(merkle_root_);	76✔
205	sink.write_4_bytes_little_endian(timestamp_);	76✔
206	sink.write_4_bytes_little_endian(bits_);	76✔
207	sink.write_4_bytes_little_endian(nonce_);	76✔
208	}	76✔
209
210	// Properties.
211	// ----------------------------------------------------------------------------
212
213	bool header::is_valid() const NOEXCEPT	11✔
214	{
215	return valid_;	11✔
216	}
217
218	uint32_t header::version() const NOEXCEPT	6✔
219	{
220	return version_;	4✔
221	}
222
223	const hash_digest& header::previous_block_hash() const NOEXCEPT	6✔
224	{
225	return previous_block_hash_;	6✔
226	}
227
228	const hash_digest& header::merkle_root() const NOEXCEPT	17✔
229	{
230	return merkle_root_;	17✔
231	}
232
233	uint32_t header::timestamp() const NOEXCEPT	6✔
234	{
235	return timestamp_;	4✔
236	}
237
238	uint32_t header::bits() const NOEXCEPT	6✔
239	{
240	return bits_;	4✔
241	}
242
243	uint32_t header::nonce() const NOEXCEPT	6✔
244	{
245	return nonce_;	4✔
246	}
247
248	void header::set_hash(hash_digest&& hash) const NOEXCEPT	×
249	{
250	hash_ = to_shared(std::move(hash));	×
251	}	×
252
253	// computed
254	hash_digest header::hash() const NOEXCEPT	39✔
255	{
256	if (hash_)	39✔
257	return *hash_;	×
258
259	BC_PUSH_WARNING(LOCAL_VARIABLE_NOT_INITIALIZED)
260	hash_digest digest;	39✔
261	BC_POP_WARNING()
262
263	stream::out::fast stream{ digest };	39✔
264	hash::sha256x2::fast sink{ stream };	39✔
265	to_data(sink);	39✔
266	sink.flush();	39✔
267	return digest;	39✔
268	}	39✔
269
270	const hash_digest& header::get_hash() const NOEXCEPT	×
271	{
272	if (!hash_)	×
273	set_hash(hash());	×
274
275	return *hash_;	×
276	}
277
278	// static
279	uint256_t header::proof(uint32_t bits) NOEXCEPT	1✔
280	{
281	auto target = compact::expand(bits);	1✔
282
283	//*************************************************************************
284	// CONSENSUS: bits may be overflowed, which is guarded here.
285	// A target of zero is disallowed so is useful as a sentinel value.
286	//*************************************************************************
287	if (is_zero(target))	1✔
288	return target;	×
289
290	//*************************************************************************
291	// CONSENSUS: If target is (2^256)-1, division would fail, however compact
292	// compression is lossy, and therefore unable to produce negative one.
293	//*************************************************************************
294
295	// We need to compute 2256 / (target + 1), but we can't represent 2256
296	// as it's too large for uint256. However as 2**256 is at least as large as
297	// target + 1, it is equal to ((2**256 - target - 1) / (target + 1)) + 1, or
298	// (~target / (target + 1)) + 1.
299	return ++(~target / (target + one));	2✔
300	}
301
302	// computed
303	uint256_t header::proof() const NOEXCEPT	1✔
304	{
305	// Returns zero if bits_ mantissa is less than one or bits_ is overflowed.
306	return proof(bits_);	1✔
307	}
308
309	// Check.
310	// ----------------------------------------------------------------------------
311
312	bool header::is_invalid_proof_of_work(uint32_t proof_of_work_limit,	6✔
313	bool scrypt) const NOEXCEPT
314	{
315	static const auto limit = compact::expand(proof_of_work_limit);	6✔
316	const auto target = compact::expand(bits_);	6✔
317
318	//*************************************************************************
319	// CONSENSUS: bits_ may be overflowed, which is guarded here.
320	// A target of zero is disallowed so is useful as a sentinel value.
321	//*************************************************************************
322	if (is_zero(target))	6✔
323	return true;
324
325	// Ensure claimed work is at or above minimum (less is more).
326	if (target > limit)	5✔
327	return true;
328
329	// Conditionally use scrypt proof of work (e.g. Litecoin).
330	return to_uintx(scrypt ? scrypt_hash(to_data()) : hash()) > target;	10✔
331	}
332
333	// ****************************************************************************
334	// CONSENSUS: bitcoin 32bit unix time: en.wikipedia.org/wiki/Year_2038_problem
335	// ****************************************************************************
336	bool header::is_invalid_timestamp(	2✔
337	uint32_t timestamp_limit_seconds) const NOEXCEPT
338	{
339	using namespace std::chrono;	2✔
340	static const auto two_hours = seconds(timestamp_limit_seconds);	2✔
341	const auto time = wall_clock::from_time_t(timestamp_);	2✔
342	const auto future = wall_clock::now() + two_hours;	2✔
343	return time > future;	2✔
344	}
345
346	// Validation.
347	// ----------------------------------------------------------------------------
348
349	code header::check(uint32_t timestamp_limit_seconds,	×
350	uint32_t proof_of_work_limit, bool scrypt) const NOEXCEPT
351	{
352	if (is_invalid_proof_of_work(proof_of_work_limit, scrypt))	×
353	return error::invalid_proof_of_work;	×
354	if (is_invalid_timestamp(timestamp_limit_seconds))	×
355	return error::futuristic_timestamp;	×
356
357	return error::block_success;	×
358	}
359
360	// minimum_block_version
361	// median_time_past
362	// work_required
363
364	// Checkpoints and previous_block_hash are chain validation (not here).
365	// bits_ below is the consensus direct comparison of the header.bits value.
366	// All other work comparisons performed on expanded/normalized bits values.
367	code header::accept(const context& ctx) const NOEXCEPT	×
368	{
369	if (version_ < ctx.minimum_block_version)	×
370	return error::invalid_block_version;	×
371	if (timestamp_ <= ctx.median_time_past)	×
372	return error::timestamp_too_early;	×
373	if (bits_ != ctx.work_required)	×
374	return error::incorrect_proof_of_work;	×
375
376	return error::block_success;	×
377	}
378
379	// JSON value convertors.
380	// ----------------------------------------------------------------------------
381
382	namespace json = boost::json;
383
384	// boost/json will soon have NOEXCEPT: github.com/boostorg/json/pull/636
385	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
386
387	header tag_invoke(json::value_to_tag<header>,	2✔
388	const json::value& value) NOEXCEPT
389	{
390	hash_digest previous, merkle_root;	2✔
391	if (!decode_hash(previous, value.at("previous").get_string().c_str()) \|\|	4✔
392	!decode_hash(merkle_root, value.at("merkle_root").get_string().c_str()))	2✔
393	return {};	×
394
395	return	2✔
396	{
397	value.at("version").to_number<uint32_t>(),	2✔
398	previous,
399	merkle_root,
400	value.at("timestamp").to_number<uint32_t>(),	2✔
401	value.at("bits").to_number<uint32_t>(),	2✔
402	value.at("nonce").to_number<uint32_t>()	4✔
403	};	8✔
404	}
405
406	void tag_invoke(json::value_from_tag, json::value& value,	4✔
407	const header& tx) NOEXCEPT
408	{
409	value =	16✔
410	{
411	{ "version", tx.version() },
412	{ "previous", encode_hash(tx.previous_block_hash()) },	4✔
413	{ "merkle_root", encode_hash(tx.merkle_root()) },	8✔
414	{ "timestamp", tx.timestamp() },
415	{ "bits", tx.bits() },
416	{ "nonce", tx.nonce() }
417	};	4✔
418	}	4✔
419
420	BC_POP_WARNING()
421
422	header::cptr tag_invoke(json::value_to_tag<header::cptr>,	×
423	const json::value& value) NOEXCEPT
424	{
425	return to_shared(tag_invoke(json::value_to_tag<header>{}, value));	×
426	}
427
428	// Shared pointer overload is required for navigation.
429	BC_PUSH_WARNING(SMART_PTR_NOT_NEEDED)
430	BC_PUSH_WARNING(NO_VALUE_OR_CONST_REF_SHARED_PTR)
431
432	void tag_invoke(json::value_from_tag tag, json::value& value,	×
433	const header::cptr& tx) NOEXCEPT
434	{
435	tag_invoke(tag, value, *tx);	×
436	}	×
437
438	BC_POP_WARNING()
439	BC_POP_WARNING()
440
441	} // namespace chain
442	} // namespace system
443	} // namespace libbitcoin

libbitcoin / libbitcoin-system / 9879696031

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