Alternative approach to #31003, suggested in #31109 (comment).
This PR introduces waitNext(). It waits for either the tip to update or for fees at the top of the mempool to rise sufficiently. It then returns a new template, with which the caller can rinse and repeat.
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993+ }
994+
995+ return block_template;
996+ }
997+
998+ const CScript m_script_pub_key;
script_pub_key around. Afaik it’s only used by tests and for solo CPU mining.
937@@ -938,9 +938,71 @@ class BlockTemplateImpl : public BlockTemplate
938 return chainman().ProcessNewBlock(block_ptr, /*force_processing=*/true, /*min_pow_checked=*/true, /*new_block=*/nullptr);
939 }
940
941+ std::unique_ptr<BlockTemplate> waitNext(CAmount fee_threshold, MillisecondsDouble timeout) override
942+ {
943+ if (timeout > std::chrono::years{100}) timeout = std::chrono::years{100}; // Upper bound to avoid UB in std::chrono
I dropped this line.
Additionally this PR does not make use of last_mempool_update, since it’s not very useful in a typical production setting where something in the mempool updates all the time.
I think the race condition mentioned there is not an issue here because we don’t pass in the current fees via argument, but instead derive them from the original template.
I did forget to update now at the end of the loop, which I fixed.
miner_tests to use the Mining interface. I plan to expand those tests to cover waitNext().
71-BlockAssembler MinerTestingSetup::AssemblerForTest(CTxMemPool& tx_mempool)
72-{
73- BlockAssembler::Options options;
74-
75- options.nBlockMaxWeight = MAX_BLOCK_WEIGHT;
76- options.blockMinFeeRate = blockMinFeeRate;
684 }
685- std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
686- BOOST_CHECK(Assert(m_node.chainman)->ProcessNewBlock(shared_pblock, true, true, nullptr));
687- pblock->hashPrevBlock = pblock->GetHash();
688+ std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(block);
689+ BOOST_REQUIRE(Assert(m_node.chainman)->ProcessNewBlock(shared_pblock, /*force_processing=*/true, /*min_pow_checked=*/true, nullptr));
miner.submitSolution() here.
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ProcessNewBlock and submitSolution via the Mining interface. The latter approach is much simpler, but both are used in production code, so should be covered.
waitNext().
In commit f9200f6c65b5a97a4842cc1ec34e688ec13bffcd
“Use createNewBlock via the interface instead of calling Chainman’s CreateNewBlock.”
Do you mean “Use createNewBlock via the interface instead of calling CreateNewBlock through the BlockAssembler directly”? There is no CreateNewBlock in the chainman.
Alternate calls between Chainman's ProcessNewBlock and submitSolution. The Chainman code path is used in production, so it's important to keep test coverage for it.
Use createNewBlock via the interface instead of using the BlockAssembler directly. The latter is always called via the interface in production code.
987+ CAmount new_fees = 0;
988+ for (CAmount fee : block_template->m_block_template->vTxFees) {
989+ // Skip coinbase
990+ if (fee < 0) continue;
991+ new_fees += fee;
992+ if (new_fees >= current_fees + fee_threshold) return block_template;
fee_threshold of 0 combined with a timeout of 0 will immediately return a new template. This is useful for the Template Provider, because it needs to unconditionally send new templates to all connected clients if fees increased sufficiently for one its connected clients. (at least until cluster mempool makes the fee calculation trivially cheap)
🐙 This pull request conflicts with the target branch and needs rebase.
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Needs rebase