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// Copyright (c) 2018 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <interfaces/chain.h>
#include <chain.h>
#include <chainparams.h>
#include <primitives/block.h>
#include <sync.h>
#include <uint256.h>
#include <util/system.h>
#include <validation.h>
#include <memory>
#include <utility>
namespace interfaces {
namespace {
class LockImpl : public Chain::Lock
{
Optional<int> getHeight() override
{
int height = ::chainActive.Height();
if (height >= 0) {
return height;
}
return nullopt;
}
Optional<int> getBlockHeight(const uint256& hash) override
{
CBlockIndex* block = LookupBlockIndex(hash);
if (block && ::chainActive.Contains(block)) {
return block->nHeight;
}
return nullopt;
}
int getBlockDepth(const uint256& hash) override
{
const Optional<int> tip_height = getHeight();
const Optional<int> height = getBlockHeight(hash);
return tip_height && height ? *tip_height - *height + 1 : 0;
}
uint256 getBlockHash(int height) override
{
CBlockIndex* block = ::chainActive[height];
assert(block != nullptr);
return block->GetBlockHash();
}
int64_t getBlockTime(int height) override
{
CBlockIndex* block = ::chainActive[height];
assert(block != nullptr);
return block->GetBlockTime();
}
int64_t getBlockMedianTimePast(int height) override
{
CBlockIndex* block = ::chainActive[height];
assert(block != nullptr);
return block->GetMedianTimePast();
}
bool haveBlockOnDisk(int height) override
{
CBlockIndex* block = ::chainActive[height];
return block && ((block->nStatus & BLOCK_HAVE_DATA) != 0) && block->nTx > 0;
}
Optional<int> findFirstBlockWithTime(int64_t time, uint256* hash) override
{
CBlockIndex* block = ::chainActive.FindEarliestAtLeast(time);
if (block) {
if (hash) *hash = block->GetBlockHash();
return block->nHeight;
}
return nullopt;
}
Optional<int> findFirstBlockWithTimeAndHeight(int64_t time, int height) override
{
// TODO: Could update CChain::FindEarliestAtLeast() to take a height
// parameter and use it with std::lower_bound() to make this
// implementation more efficient and allow combining
// findFirstBlockWithTime and findFirstBlockWithTimeAndHeight into one
// method.
for (CBlockIndex* block = ::chainActive[height]; block; block = ::chainActive.Next(block)) {
if (block->GetBlockTime() >= time) {
return block->nHeight;
}
}
return nullopt;
}
Optional<int> findPruned(int start_height, Optional<int> stop_height) override
{
if (::fPruneMode) {
CBlockIndex* block = stop_height ? ::chainActive[*stop_height] : ::chainActive.Tip();
while (block && block->nHeight >= start_height) {
if ((block->nStatus & BLOCK_HAVE_DATA) == 0) {
return block->nHeight;
}
block = block->pprev;
}
}
return nullopt;
}
Optional<int> findFork(const uint256& hash, Optional<int>* height) override
{
const CBlockIndex* block = LookupBlockIndex(hash);
const CBlockIndex* fork = block ? ::chainActive.FindFork(block) : nullptr;
if (height) {
if (block) {
*height = block->nHeight;
} else {
height->reset();
}
}
if (fork) {
return fork->nHeight;
}
return nullopt;
}
bool isPotentialTip(const uint256& hash) override
{
if (::chainActive.Tip()->GetBlockHash() == hash) return true;
CBlockIndex* block = LookupBlockIndex(hash);
return block && block->GetAncestor(::chainActive.Height()) == ::chainActive.Tip();
}
CBlockLocator getLocator() override { return ::chainActive.GetLocator(); }
Optional<int> findLocatorFork(const CBlockLocator& locator) override
{
LockAnnotation lock(::cs_main);
if (CBlockIndex* fork = FindForkInGlobalIndex(::chainActive, locator)) {
return fork->nHeight;
}
return nullopt;
}
};
class LockingStateImpl : public LockImpl, public UniqueLock<CCriticalSection>
{
using UniqueLock::UniqueLock;
};
class ChainImpl : public Chain
{
public:
std::unique_ptr<Chain::Lock> lock(bool try_lock) override
{
auto result = MakeUnique<LockingStateImpl>(::cs_main, "cs_main", __FILE__, __LINE__, try_lock);
if (try_lock && result && !*result) return {};
// std::move necessary on some compilers due to conversion from
// LockingStateImpl to Lock pointer
return std::move(result);
}
std::unique_ptr<Chain::Lock> assumeLocked() override { return MakeUnique<LockImpl>(); }
bool findBlock(const uint256& hash, CBlock* block, int64_t* time, int64_t* time_max) override
{
CBlockIndex* index;
{
LOCK(cs_main);
index = LookupBlockIndex(hash);
if (!index) {
return false;
}
if (time) {
*time = index->GetBlockTime();
}
if (time_max) {
*time_max = index->GetBlockTimeMax();
}
}
if (block && !ReadBlockFromDisk(*block, index, Params().GetConsensus())) {
block->SetNull();
}
return true;
}
double guessVerificationProgress(const uint256& block_hash) override
{
LOCK(cs_main);
return GuessVerificationProgress(Params().TxData(), LookupBlockIndex(block_hash));
}
};
} // namespace
std::unique_ptr<Chain> MakeChain() { return MakeUnique<ChainImpl>(); }
} // namespace interfaces
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