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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
Audacity: A Digital Audio Editor
BlockHasher.cpp
Dmitry Vedenko
**********************************************************************/
#include "BlockHasher.h"
#include <algorithm>
#include <atomic>
#include <future>
#include <iomanip>
#include <sstream>
#include <utility>
#include "MemoryX.h"
#include "SampleBlock.h"
#include "crypto/SHA256.h"
namespace audacity::cloud::audiocom::sync
{
class BlockHasher::Workers final
{
public:
using SampleData = std::vector<std::remove_pointer_t<samplePtr>>;
explicit Workers(
BlockHashCache& cache, const std::vector<LockedBlock> blocks,
std::function<void()> onComplete)
: mThreadsCount { std::max(1u, std::thread::hardware_concurrency() / 2) }
, mCache { cache }
, mOnComplete { std::move(onComplete) }
{
mResults.reserve(mThreadsCount);
const auto blocksCount = blocks.size();
// Try to add no more that 1 extra block per thread
const size_t blockPerThread = blocks.size() / mThreadsCount + 1;
for (size_t i = 0; i < mThreadsCount; ++i)
{
const size_t startIndex = i;
if (startIndex >= blocks.size())
break;
std::vector<LockedBlock> threadBlocks;
threadBlocks.reserve(blockPerThread);
for (size_t j = startIndex; j < blocksCount; j += mThreadsCount)
threadBlocks.emplace_back(blocks[j]);
mResults.emplace_back(std::async(
std::launch::async,
[this, threadBlocks = std::move(threadBlocks)]()
{
Result result;
SampleData sampleData;
for (const auto& block : threadBlocks)
result.emplace(block.Id, ComputeHash(sampleData, block));
return result;
}));
}
mWaiter = std::async(
std::launch::async,
[this]
{
for (auto& fut : mResults)
fut.wait();
NotifyReady();
});
}
bool IsReady() const
{
return std::all_of(
mResults.begin(), mResults.end(),
[](const auto& result)
{
return result.wait_for(std::chrono::seconds(0)) ==
std::future_status::ready;
});
}
std::pair<std::string, bool>
ComputeHash(SampleData& sampleData, const LockedBlock& block) const
{
assert(block.Id >= 0);
if(block.Id < 0)
return {{}, false};
std::string hash;
if (mCache.GetHash(block.Id, hash))
return { hash, false };
const auto sampleFormat = block.Format;
const auto sampleCount = block.Block->GetSampleCount();
const auto dataSize = sampleCount * SAMPLE_SIZE(sampleFormat);
sampleData.resize(dataSize);
const size_t samplesRead = block.Block->GetSamples(
sampleData.data(), sampleFormat, 0, sampleCount, false);
if (samplesRead != sampleCount)
return { {}, false };
hash = crypto::sha256(sampleData);
std::ostringstream oss;
oss << std::hex << std::uppercase << std::setw(8) << std::setfill('0') << block.Id;
std::string blockIdHex = oss.str();
hash.replace(0, 8, blockIdHex);
return { hash, true };
}
void NotifyReady()
{
if (mOnComplete)
mOnComplete();
}
std::vector<std::pair<int64_t, std::string>> TakeResult()
{
std::vector<std::pair<int64_t, std::string>> result;
for (auto& fut : mResults)
{
const auto& threadResult = fut.get();
for (const auto& [id, hash] : threadResult)
{
result.emplace_back(std::make_pair(id, hash.first));
if (hash.second)
mCache.UpdateHash(id, hash.first);
}
}
mResults.clear();
return result;
}
private:
const size_t mThreadsCount;
BlockHashCache& mCache;
using Result = std::unordered_map<int64_t, std::pair<std::string, bool>>;
std::vector<std::future<Result>> mResults;
std::future<void> mWaiter;
std::function<void()> mOnComplete;
};
BlockHasher::BlockHasher() = default;
BlockHasher::~BlockHasher() = default;
bool BlockHasher::ComputeHashes(
BlockHashCache& cache, std::vector<LockedBlock> blocks,
std::function<void()> onComplete)
{
if (mWorkers != nullptr && !mWorkers->IsReady())
return false;
if (blocks.empty())
{
if (onComplete)
onComplete();
return true;
}
mWorkers = std::make_unique<Workers>(
cache, std::move(blocks), std::move(onComplete));
return true;
}
bool BlockHasher::IsReady() const
{
return mWorkers != nullptr && mWorkers->IsReady();
}
std::vector<std::pair<int64_t, std::string>> BlockHasher::TakeResult()
{
if (mWorkers == nullptr)
return {};
return mWorkers->TakeResult();
}
} // namespace audacity::cloud::audiocom::sync
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