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Add fedpegscript-fetching helper

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This commit is contained in:
Gregory Sanders 2019-05-31 11:30:10 -04:00
parent b56fe14956
commit 830f917235
1 changed files with 42 additions and 0 deletions
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42
src/pegins.cpp
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@ -20,6 +20,7 @@
#include <script/standard.h>
#include <streams.h>
#include <util/system.h>
#include <dynafed.h>
//
// ELEMENTS
@ -443,3 +444,44 @@ bool MatchLiquidWatchman(const CScript& script)
// No more pushes
return (it == script.end());
}
std::vector<CScript> GetValidFedpegScripts(const CBlockIndex* pblockindex, const Consensus::Params& params, bool nextblock_validation)
{
assert(pblockindex);
std::vector<CScript> fedpegscripts;
const int32_t epoch_length = params.dynamic_epoch_length;
const int32_t epoch_age = pblockindex->nHeight % epoch_length;
const int32_t epoch_start_height = pblockindex->nHeight - epoch_age;
// In mempool and general "enforced next block" RPC we need to look ahead one block
// to see if we're on a boundary. If so, put that epoch's fedpegscript in place
if (nextblock_validation && epoch_age == epoch_length - 1) {
fedpegscripts.push_back(ComputeNextBlockFullCurrentParameters(pblockindex, params).m_fedpegscript);
}
// Next we walk backwards up to two epoch start blocks
const CBlockIndex* p_current_epoch_start = pblockindex->GetAncestor(epoch_start_height);
const CBlockIndex* p_prev_epoch_start = pblockindex->GetAncestor(epoch_start_height-epoch_length);
if (p_current_epoch_start) {
if (!p_current_epoch_start->d_params.IsNull()) {
fedpegscripts.push_back(p_current_epoch_start->d_params.m_current.m_fedpegscript);
} else {
fedpegscripts.push_back(params.fedpegScript);
}
}
if (p_prev_epoch_start) {
if (!p_prev_epoch_start->d_params.IsNull()) {
fedpegscripts.push_back(p_prev_epoch_start->d_params.m_current.m_fedpegscript);
} else {
fedpegscripts.push_back(params.fedpegScript);
}
}
// Only return up to the latest two of three possible fedpegscripts, which are enforced
fedpegscripts.resize(std::min((int)fedpegscripts.size(), 2));
return fedpegscripts;
}