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Merge bitcoin/bitcoin#29668: prune, rpc: Check undo data when finding pruneheight

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8789dc8f31 doc: Add note to getblockfrompeer on missing undo data (Fabian Jahr)
4a1975008b rpc: Make pruneheight also reflect undo data presence (Fabian Jahr)
96b4facc91 refactor, blockstorage: Generalize GetFirstStoredBlock (Fabian Jahr)

Pull request description:

  The function `GetFirstStoredBlock()` helps us find the first block for which we have data. So far this function only looked for a block with `BLOCK_HAVE_DATA`. However, this doesn't mean that we also have the undo data of that block, and undo data might be required for what a user would like to do with those blocks. One example of how this might happen is if some blocks were fetched using the `getblockfrompeer` RPC. Blocks fetched from a peer will have data but no undo data.

  The first commit here allows `GetFirstStoredBlock()` to check for undo data as well by passing a parameter. This alone is useful for #29553 and I would use it there.

  In the second commit I am applying the undo check to the RPCs that report `pruneheight` to the user. I find this much more intuitive because I think the user expects to be able to do all operations on blocks up until the `pruneheight` but that is not the case if undo data is missing. I personally ran into this once before and now again when testing for assumeutxo when I had used `getblockfrompeer`. The following commit adds test coverage for this change of behavior.

  The last commit adds a note in the docs of `getblockfrompeer` that undo data will not be available.

ACKs for top commit:
  achow101:
    ACK 8789dc8f31
  furszy:
    Code review ACK 8789dc8f31.
  stickies-v:
    ACK 8789dc8f31

Tree-SHA512: 90ae8bdd07a496ade579aa25240609c61c9ed173ad38d30533f6c631fe674e5a41727478ade69ca4b71a571ad94c9da4b33ebba6b5d8821109313c2de3bdfb3d
This commit is contained in:
Ava Chow
2024-07-10 15:27:05 -04:00
parent 394651ff10 8789dc8f31
commit f4849f6922
7 changed files with 120 additions and 14 deletions
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5
src/test/blockmanager_tests.cpp
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@@ -2,6 +2,7 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <chain.h>
#include <chainparams.h>
#include <clientversion.h>
#include <node/blockstorage.h>
@@ -113,7 +114,7 @@ BOOST_FIXTURE_TEST_CASE(blockmanager_block_data_availability, TestChain100Setup)
};
// 1) Return genesis block when all blocks are available
BOOST_CHECK_EQUAL(blockman.GetFirstStoredBlock(tip), chainman->ActiveChain()[0]);
BOOST_CHECK_EQUAL(blockman.GetFirstBlock(tip, BLOCK_HAVE_DATA), chainman->ActiveChain()[0]);
BOOST_CHECK(blockman.CheckBlockDataAvailability(tip, *chainman->ActiveChain()[0]));
// 2) Check lower_block when all blocks are available
@@ -127,7 +128,7 @@ BOOST_FIXTURE_TEST_CASE(blockmanager_block_data_availability, TestChain100Setup)
func_prune_blocks(last_pruned_block);
// 3) The last block not pruned is in-between upper-block and the genesis block
BOOST_CHECK_EQUAL(blockman.GetFirstStoredBlock(tip), first_available_block);
BOOST_CHECK_EQUAL(blockman.GetFirstBlock(tip, BLOCK_HAVE_DATA), first_available_block);
BOOST_CHECK(blockman.CheckBlockDataAvailability(tip, *first_available_block));
BOOST_CHECK(!blockman.CheckBlockDataAvailability(tip, *last_pruned_block));
}