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diff --git a/doc/assumeutxo.md b/doc/assumeutxo.md
--- a/doc/assumeutxo.md
+++ b/doc/assumeutxo.md
@@ -3,7 +3,7 @@
Assumeutxo is a feature that allows fast bootstrapping of a validating bitcoind
instance with a very similar security model to assumevalid.
-The RPC commands `dumptxoutset` and `loadtxoutset` (yet to be merged) are used to
+The RPC commands `dumptxoutset` and `loadtxoutset` are used to
respectively generate and load UTXO snapshots. The utility script
`./contrib/devtools/utxo_snapshot.sh` may be of use.
diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -3,5 +3,3 @@
Bitcoin ABC version 0.31.2 is now available from:
<https://download.bitcoinabc.org/0.31.2/>
-
-This is a maintenance release with no user-visible change.
diff --git a/src/kernel/chainparams.cpp b/src/kernel/chainparams.cpp
--- a/src/kernel/chainparams.cpp
+++ b/src/kernel/chainparams.cpp
@@ -485,6 +485,15 @@
.blockhash =
BlockHash{uint256S("0x47cfb2b77860d250060e78d3248bb05092876545"
"3cbcbdbc121e3c48b99a376c")}},
+ {// For use by test/functional/feature_assumeutxo.py
+ .height = 299,
+ .hash_serialized =
+ AssumeutxoHash{uint256S("0xa966794ed5a2f9debaefc7ca48dbc5d5e12"
+ "a89ff9fe45bd00ec5732d074580a9")},
+ .nChainTx = 334,
+ .blockhash =
+ BlockHash{uint256S("0x118a7d5473bccce9b314789e14ce426fc65fb09d"
+ "feda0131032bb6d86ed2fd0b")}},
};
chainTxData = ChainTxData{0, 0, 0};
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -8,6 +8,7 @@
#include <blockfilter.h>
#include <chain.h>
#include <chainparams.h>
+#include <clientversion.h>
#include <coins.h>
#include <common/args.h>
#include <config.h>
@@ -2623,7 +2624,7 @@
static RPCHelpMan dumptxoutset() {
return RPCHelpMan{
"dumptxoutset",
- "Write the serialized UTXO set to disk.\n",
+ "Write the serialized UTXO set to a file.\n",
{
{"path", RPCArg::Type::STR, RPCArg::Optional::NO,
"path to the output file. If relative, will be prefixed by "
@@ -2755,6 +2756,194 @@
return result;
}
+static RPCHelpMan loadtxoutset() {
+ return RPCHelpMan{
+ "loadtxoutset",
+ "Load the serialized UTXO set from a file.\n"
+ "Once this snapshot is loaded, its contents will be deserialized into "
+ "a second chainstate data structure, which is then used to sync to the "
+ "network's tip. "
+ "Meanwhile, the original chainstate will complete the initial block "
+ "download process in the background, eventually validating up to the "
+ "block that the snapshot is based upon.\n\n"
+ "The result is a usable bitcoind instance that is current with the "
+ "network tip in a matter of minutes rather than hours. UTXO snapshot "
+ "are typically obtained from third-party sources (HTTP, torrent, etc.) "
+ "which is reasonable since their contents are always checked by "
+ "hash.\n\n"
+ "You can find more information on this process in the `assumeutxo` "
+ "design document "
+ "(<https://www.bitcoinabc.org/doc/assumeutxo.html assumeutxo.md>).",
+ {
+ {"path", RPCArg::Type::STR, RPCArg::Optional::NO,
+ "path to the snapshot file. If relative, will be prefixed by "
+ "datadir."},
+ },
+ RPCResult{RPCResult::Type::OBJ,
+ "",
+ "",
+ {
+ {RPCResult::Type::NUM, "coins_loaded",
+ "the number of coins loaded from the snapshot"},
+ {RPCResult::Type::STR_HEX, "tip_hash",
+ "the hash of the base of the snapshot"},
+ {RPCResult::Type::NUM, "base_height",
+ "the height of the base of the snapshot"},
+ {RPCResult::Type::STR, "path",
+ "the absolute path that the snapshot was loaded from"},
+ }},
+ RPCExamples{HelpExampleCli("loadtxoutset", "utxo.dat")},
+ [&](const RPCHelpMan &self, const Config &config,
+ const JSONRPCRequest &request) -> UniValue {
+ NodeContext &node = EnsureAnyNodeContext(request.context);
+ ChainstateManager &chainman = EnsureChainman(node);
+ fs::path path{AbsPathForConfigVal(
+ EnsureArgsman(node), fs::u8path(request.params[0].get_str()))};
+
+ FILE *file{fsbridge::fopen(path, "rb")};
+ AutoFile afile{file};
+ if (afile.IsNull()) {
+ throw JSONRPCError(RPC_INVALID_PARAMETER,
+ "Couldn't open file " + path.u8string() +
+ " for reading.");
+ }
+
+ SnapshotMetadata metadata;
+ afile >> metadata;
+
+ BlockHash base_blockhash = metadata.m_base_blockhash;
+ if (!chainman.GetParams()
+ .AssumeutxoForBlockhash(base_blockhash)
+ .has_value()) {
+ throw JSONRPCError(
+ RPC_INTERNAL_ERROR,
+ strprintf("Unable to load UTXO snapshot, "
+ "assumeutxo block hash in snapshot metadata not "
+ "recognized (%s)",
+ base_blockhash.ToString()));
+ }
+ CBlockIndex *snapshot_start_block = WITH_LOCK(
+ ::cs_main,
+ return chainman.m_blockman.LookupBlockIndex(base_blockhash));
+
+ if (!snapshot_start_block) {
+ throw JSONRPCError(
+ RPC_INTERNAL_ERROR,
+ strprintf("The base block header (%s) must appear in the "
+ "headers chain. Make sure all headers are "
+ "synced, and call this RPC again.",
+ base_blockhash.ToString()));
+ }
+ if (!chainman.ActivateSnapshot(afile, metadata, false)) {
+ throw JSONRPCError(RPC_INTERNAL_ERROR,
+ "Unable to load UTXO snapshot " +
+ fs::PathToString(path));
+ }
+ CBlockIndex *new_tip{
+ WITH_LOCK(::cs_main, return chainman.ActiveTip())};
+
+ UniValue result(UniValue::VOBJ);
+ result.pushKV("coins_loaded", metadata.m_coins_count);
+ result.pushKV("tip_hash", new_tip->GetBlockHash().ToString());
+ result.pushKV("base_height", new_tip->nHeight);
+ result.pushKV("path", fs::PathToString(path));
+ return result;
+ },
+ };
+}
+
+const std::vector<RPCResult> RPCHelpForChainstate{
+ {RPCResult::Type::NUM, "blocks", "number of blocks in this chainstate"},
+ {RPCResult::Type::STR_HEX, "bestblockhash", "blockhash of the tip"},
+ {RPCResult::Type::NUM, "difficulty", "difficulty of the tip"},
+ {RPCResult::Type::NUM, "verificationprogress",
+ "progress towards the network tip"},
+ {RPCResult::Type::STR_HEX, "snapshot_blockhash", /*optional=*/true,
+ "the base block of the snapshot this chainstate is based on, if any"},
+ {RPCResult::Type::NUM, "coins_db_cache_bytes", "size of the coinsdb cache"},
+ {RPCResult::Type::NUM, "coins_tip_cache_bytes",
+ "size of the coinstip cache"},
+ {RPCResult::Type::BOOL, "validated",
+ "whether the chainstate is fully validated. True if all blocks in the "
+ "chainstate were validated, false if the chain is based on a snapshot and "
+ "the snapshot has not yet been validated."},
+
+};
+
+static RPCHelpMan getchainstates() {
+ return RPCHelpMan{
+ "getchainstates",
+ "\nReturn information about chainstates.\n",
+ {},
+ RPCResult{RPCResult::Type::OBJ,
+ "",
+ "",
+ {
+ {RPCResult::Type::NUM, "headers",
+ "the number of headers seen so far"},
+ {RPCResult::Type::ARR,
+ "chainstates",
+ "list of the chainstates ordered by work, with the "
+ "most-work (active) chainstate last",
+ {
+ {RPCResult::Type::OBJ, "", "", RPCHelpForChainstate},
+ }},
+ }},
+ RPCExamples{HelpExampleCli("getchainstates", "") +
+ HelpExampleRpc("getchainstates", "")},
+ [&](const RPCHelpMan &self, const Config &config,
+ const JSONRPCRequest &request) -> UniValue {
+ LOCK(cs_main);
+ UniValue obj(UniValue::VOBJ);
+
+ ChainstateManager &chainman = EnsureAnyChainman(request.context);
+
+ auto make_chain_data =
+ [&](const Chainstate &chainstate,
+ bool validated) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
+ AssertLockHeld(::cs_main);
+ UniValue data(UniValue::VOBJ);
+ if (!chainstate.m_chain.Tip()) {
+ return data;
+ }
+ const CChain &chain = chainstate.m_chain;
+ const CBlockIndex *tip = chain.Tip();
+
+ data.pushKV("blocks", chain.Height());
+ data.pushKV("bestblockhash", tip->GetBlockHash().GetHex());
+ data.pushKV("difficulty", GetDifficulty(tip));
+ data.pushKV(
+ "verificationprogress",
+ GuessVerificationProgress(Params().TxData(), tip));
+ data.pushKV("coins_db_cache_bytes",
+ chainstate.m_coinsdb_cache_size_bytes);
+ data.pushKV("coins_tip_cache_bytes",
+ chainstate.m_coinstip_cache_size_bytes);
+ if (chainstate.m_from_snapshot_blockhash) {
+ data.pushKV(
+ "snapshot_blockhash",
+ chainstate.m_from_snapshot_blockhash->ToString());
+ }
+ data.pushKV("validated", validated);
+ return data;
+ };
+
+ obj.pushKV("headers", chainman.m_best_header
+ ? chainman.m_best_header->nHeight
+ : -1);
+
+ const auto &chainstates = chainman.GetAll();
+ UniValue obj_chainstates{UniValue::VARR};
+ for (Chainstate *cs : chainstates) {
+ obj_chainstates.push_back(
+ make_chain_data(*cs, !cs->m_from_snapshot_blockhash ||
+ chainstates.size() == 1));
+ }
+ obj.pushKV("chainstates", std::move(obj_chainstates));
+ return obj;
+ }};
+}
+
void RegisterBlockchainRPCCommands(CRPCTable &t) {
// clang-format off
static const CRPCCommand commands[] = {
@@ -2778,13 +2967,15 @@
{ "blockchain", preciousblock, },
{ "blockchain", scantxoutset, },
{ "blockchain", getblockfilter, },
+ { "blockchain", dumptxoutset, },
+ { "blockchain", loadtxoutset, },
+ { "blockchain", getchainstates, },
/* Not shown in help */
{ "hidden", invalidateblock, },
{ "hidden", parkblock, },
{ "hidden", reconsiderblock, },
{ "hidden", syncwithvalidationinterfacequeue, },
- { "hidden", dumptxoutset, },
{ "hidden", unparkblock, },
{ "hidden", waitfornewblock, },
{ "hidden", waitforblock, },
diff --git a/test/functional/feature_assumeutxo.py b/test/functional/feature_assumeutxo.py
new file mode 100644
--- /dev/null
+++ b/test/functional/feature_assumeutxo.py
@@ -0,0 +1,549 @@
+# Copyright (c) 2021-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test for assumeutxo, a means of quickly bootstrapping a node using
+a serialized version of the UTXO set at a certain height, which corresponds
+to a hash that has been compiled into bitcoind.
+
+The assumeutxo value generated and used here is committed to in
+`CRegTestParams::m_assumeutxo_data` in `src/kernel/chainparams.cpp`.
+
+## Possible test improvements
+
+Interesting test cases could be loading an assumeutxo snapshot file with:
+
+- TODO: Valid snapshot file, but referencing a snapshot block that turns out to be
+ invalid, or has an invalid parent
+- TODO: Valid snapshot file and snapshot block, but the block is not on the
+ most-work chain
+
+Interesting starting states could be loading a snapshot when the current chain tip is:
+
+- TODO: An ancestor of snapshot block
+- TODO: Not an ancestor of the snapshot block but has less work
+- TODO: The snapshot block
+- TODO: A descendant of the snapshot block
+- TODO: Not an ancestor or a descendant of the snapshot block and has more work
+
+"""
+import os
+from dataclasses import dataclass
+
+from test_framework.messages import CTransaction, FromHex
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_rpc_error
+from test_framework.wallet import MiniWallet, getnewdestination
+
+START_HEIGHT = 199
+SNAPSHOT_BASE_HEIGHT = 299
+FINAL_HEIGHT = 399
+COMPLETE_IDX = {"synced": True, "best_block_height": FINAL_HEIGHT}
+
+
+class AssumeutxoTest(BitcoinTestFramework):
+ def set_test_params(self):
+ """Use the pregenerated, deterministic chain up to height 199."""
+ self.num_nodes = 3
+ self.rpc_timeout = 120
+ self.extra_args = [
+ [],
+ ["-fastprune", "-prune=1", "-blockfilterindex=1", "-coinstatsindex=1"],
+ [
+ "-persistmempool=0",
+ "-txindex=1",
+ "-blockfilterindex=1",
+ "-coinstatsindex=1",
+ ],
+ ]
+
+ def setup_network(self):
+ """Start with the nodes disconnected so that one can generate a snapshot
+ including blocks the other hasn't yet seen."""
+ self.add_nodes(3)
+ self.start_nodes(extra_args=self.extra_args)
+
+ def test_invalid_snapshot_scenarios(self, valid_snapshot_path):
+ self.log.info("Test different scenarios of loading invalid snapshot files")
+ with open(valid_snapshot_path, "rb") as f:
+ valid_snapshot_contents = f.read()
+ bad_snapshot_path = valid_snapshot_path + ".mod"
+
+ def expected_error(log_msg="", rpc_details=""):
+ with self.nodes[1].assert_debug_log([log_msg]):
+ assert_raises_rpc_error(
+ -32603,
+ f"Unable to load UTXO snapshot{rpc_details}",
+ self.nodes[1].loadtxoutset,
+ bad_snapshot_path,
+ )
+
+ self.log.info(
+ " - snapshot file refering to a block that is not in the assumeutxo parameters"
+ )
+ prev_block_hash = self.nodes[0].getblockhash(SNAPSHOT_BASE_HEIGHT - 1)
+ # Represents any unknown block hash
+ bogus_block_hash = "0" * 64
+ for bad_block_hash in [bogus_block_hash, prev_block_hash]:
+ with open(bad_snapshot_path, "wb") as f:
+ # block hash of the snapshot base is stored right at the start (first 32 bytes)
+ f.write(
+ bytes.fromhex(bad_block_hash)[::-1] + valid_snapshot_contents[32:]
+ )
+ error_details = f", assumeutxo block hash in snapshot metadata not recognized ({bad_block_hash})"
+ expected_error(rpc_details=error_details)
+
+ self.log.info(" - snapshot file with wrong number of coins")
+ valid_num_coins = int.from_bytes(valid_snapshot_contents[32 : 32 + 8], "little")
+ for off in [-1, +1]:
+ with open(bad_snapshot_path, "wb") as f:
+ f.write(valid_snapshot_contents[:32])
+ f.write((valid_num_coins + off).to_bytes(8, "little"))
+ f.write(valid_snapshot_contents[32 + 8 :])
+ expected_error(
+ log_msg=(
+ "bad snapshot - coins left over after deserializing 298 coins"
+ if off == -1
+ else "bad snapshot format or truncated snapshot after deserializing 299 coins"
+ )
+ )
+
+ self.log.info(" - snapshot file with alternated UTXO data")
+ cases = [
+ # (content, offset, wrong_hash, custom_message)
+ # wrong outpoint hash
+ [
+ b"\xff" * 32,
+ 0,
+ "74fab8900700c8a0a4c6b50330252d92d651088939a41b307a8fcdddfed65f77",
+ None,
+ ],
+ # wrong outpoint index
+ [
+ (1).to_bytes(4, "little"),
+ 32,
+ "3872c8e52554070ca410faff98e42f63c99d08f536be343af7c04143e0e8f2b2",
+ None,
+ ],
+ # wrong coin code VARINT((coinbase ? 1 : 0) | (height << 1))
+ # We expect b"\x81" (as seen in a dump of valid_snapshot_path)
+ [
+ b"\x80",
+ 36,
+ "b14c9595737179fe57e6d7a9f8e879a440833fa95ba52d210f1f7e3c02be64b2",
+ None,
+ ],
+ # another wrong coin code
+ [
+ b"\x83",
+ 36,
+ "296b4acd0d41dd4c0e845a7ed0cbdc602e5a7d092d5b4948a72835d2158f1e8e",
+ None,
+ ],
+ # wrong coin case with height 364 and coinbase 0
+ [
+ b"\x84\x58",
+ 36,
+ None,
+ "[snapshot] bad snapshot data after deserializing 0 coins",
+ ],
+ # Amount exceeds MAX_MONEY
+ [
+ b"\xCA\xD2\x8F\x5A",
+ 38,
+ None,
+ "[snapshot] bad snapshot data after deserializing 0 coins - bad tx out value",
+ ],
+ ]
+
+ for content, offset, wrong_hash, custom_message in cases:
+ with open(bad_snapshot_path, "wb") as f:
+ f.write(valid_snapshot_contents[: (32 + 8 + offset)])
+ f.write(content)
+ f.write(valid_snapshot_contents[(32 + 8 + offset + len(content)) :])
+
+ log_msg = (
+ custom_message
+ if custom_message is not None
+ else f"[snapshot] bad snapshot content hash: expected a966794ed5a2f9debaefc7ca48dbc5d5e12a89ff9fe45bd00ec5732d074580a9, got {wrong_hash}"
+ )
+ expected_error(log_msg=log_msg)
+
+ def test_headers_not_synced(self, valid_snapshot_path):
+ for node in self.nodes[1:]:
+ assert_raises_rpc_error(
+ -32603,
+ "The base block header (118a7d5473bccce9b314789e14ce426fc65fb09dfeda0131032bb6d86ed2fd0b) must appear in the headers chain. Make sure all headers are syncing, and call this RPC again.",
+ node.loadtxoutset,
+ valid_snapshot_path,
+ )
+
+ def test_invalid_mempool_state(self, dump_output_path):
+ self.log.info("Test bitcoind should fail when mempool not empty.")
+ node = self.nodes[2]
+ tx = MiniWallet(node).send_self_transfer(from_node=node)
+
+ assert tx["txid"] in node.getrawmempool()
+
+ # Attempt to load the snapshot on Node 2 and expect it to fail
+ with node.assert_debug_log(
+ expected_msgs=[
+ "[snapshot] can't activate a snapshot when mempool not empty"
+ ]
+ ):
+ assert_raises_rpc_error(
+ -32603,
+ "Unable to load UTXO snapshot",
+ node.loadtxoutset,
+ dump_output_path,
+ )
+
+ self.restart_node(2, extra_args=self.extra_args[2])
+
+ def test_invalid_file_path(self):
+ self.log.info("Test bitcoind should fail when file path is invalid.")
+ node = self.nodes[0]
+ path = os.path.join(node.datadir, self.chain, "invalid", "path")
+ assert_raises_rpc_error(
+ -8,
+ f"Couldn't open file {path} for reading.",
+ node.loadtxoutset,
+ path,
+ )
+
+ def run_test(self):
+ """
+ Bring up two (disconnected) nodes, mine some new blocks on the first,
+ and generate a UTXO snapshot.
+
+ Load the snapshot into the second, ensure it syncs to tip and completes
+ background validation when connected to the first.
+ """
+ n0 = self.nodes[0]
+ n1 = self.nodes[1]
+ n2 = self.nodes[2]
+
+ self.mini_wallet = MiniWallet(n0)
+
+ # Mock time for a deterministic chain
+ for n in self.nodes:
+ n.setmocktime(n.getblockheader(n.getbestblockhash())["time"])
+
+ # Generate a series of blocks that `n0` will have in the snapshot,
+ # but that n1 and n2 don't yet see.
+ assert n0.getblockcount() == START_HEIGHT
+ blocks = {START_HEIGHT: Block(n0.getbestblockhash(), 1, START_HEIGHT + 1)}
+ for i in range(100):
+ block_tx = 1
+ if i % 3 == 0:
+ self.mini_wallet.send_self_transfer(from_node=n0)
+ block_tx += 1
+ self.generate(n0, nblocks=1, sync_fun=self.no_op)
+ height = n0.getblockcount()
+ hash_ = n0.getbestblockhash()
+ blocks[height] = Block(
+ hash_, block_tx, blocks[height - 1].chain_tx + block_tx
+ )
+ if i == 4:
+ # Create a stale block that forks off the main chain before the snapshot.
+ temp_invalid = n0.getbestblockhash()
+ n0.invalidateblock(temp_invalid)
+ stale_hash = self.generateblock(
+ n0, output="raw(aaaa)", transactions=[], sync_fun=self.no_op
+ )["hash"]
+ n0.invalidateblock(stale_hash)
+ n0.reconsiderblock(temp_invalid)
+ stale_block = n0.getblock(stale_hash, 0)
+
+ self.log.info("-- Testing assumeutxo + some indexes + pruning")
+
+ assert_equal(n0.getblockcount(), SNAPSHOT_BASE_HEIGHT)
+ assert_equal(n1.getblockcount(), START_HEIGHT)
+
+ self.log.info(f"Creating a UTXO snapshot at height {SNAPSHOT_BASE_HEIGHT}")
+ dump_output = n0.dumptxoutset("utxos.dat")
+
+ self.log.info("Test loading snapshot when headers are not synced")
+ self.test_headers_not_synced(dump_output["path"])
+
+ # In order for the snapshot to activate, we have to ferry over the new
+ # headers to n1 and n2 so that they see the header of the snapshot's
+ # base block while disconnected from n0.
+ for i in range(1, 300):
+ block = n0.getblock(n0.getblockhash(i), 0)
+ # make n1 and n2 aware of the new header, but don't give them the
+ # block.
+ n1.submitheader(block)
+ n2.submitheader(block)
+
+ # Ensure everyone is seeing the same headers.
+ for n in self.nodes:
+ assert_equal(n.getblockchaininfo()["headers"], SNAPSHOT_BASE_HEIGHT)
+
+ assert_equal(
+ dump_output["txoutset_hash"],
+ "a966794ed5a2f9debaefc7ca48dbc5d5e12a89ff9fe45bd00ec5732d074580a9",
+ )
+ assert_equal(dump_output["nchaintx"], blocks[SNAPSHOT_BASE_HEIGHT].chain_tx)
+ assert_equal(n0.getblockchaininfo()["blocks"], SNAPSHOT_BASE_HEIGHT)
+
+ # Mine more blocks on top of the snapshot that n1 hasn't yet seen. This
+ # will allow us to test n1's sync-to-tip on top of a snapshot.
+ self.generate(n0, nblocks=100, sync_fun=self.no_op)
+
+ assert_equal(n0.getblockcount(), FINAL_HEIGHT)
+ assert_equal(n1.getblockcount(), START_HEIGHT)
+
+ assert_equal(n0.getblockchaininfo()["blocks"], FINAL_HEIGHT)
+
+ self.test_invalid_mempool_state(dump_output["path"])
+ self.test_invalid_snapshot_scenarios(dump_output["path"])
+ self.test_invalid_file_path()
+
+ self.log.info(f"Loading snapshot into second node from {dump_output['path']}")
+ loaded = n1.loadtxoutset(dump_output["path"])
+ assert_equal(loaded["coins_loaded"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(loaded["base_height"], SNAPSHOT_BASE_HEIGHT)
+
+ def check_tx_counts(final: bool) -> None:
+ """Check nTx and nChainTx intermediate values right after loading
+ the snapshot, and final values after the snapshot is validated."""
+ for height, block in blocks.items():
+ tx = n1.getblockheader(block.hash)["nTx"]
+ chain_tx = n1.getchaintxstats(nblocks=1, blockhash=block.hash)[
+ "txcount"
+ ]
+
+ # Intermediate nTx of the starting block should be set, but nTx of
+ # later blocks should be 0 before they are downloaded
+ if final or height == START_HEIGHT:
+ assert_equal(tx, block.tx)
+ else:
+ assert_equal(tx, 0)
+
+ # Intermediate nChainTx of the starting block and snapshot block
+ # should be set, but others should be 0 until they are downloaded.
+ if final or height in (START_HEIGHT, SNAPSHOT_BASE_HEIGHT):
+ assert_equal(chain_tx, block.chain_tx)
+ else:
+ assert_equal(chain_tx, 0)
+
+ check_tx_counts(final=False)
+
+ normal, snapshot = n1.getchainstates()["chainstates"]
+ assert_equal(normal["blocks"], START_HEIGHT)
+ assert_equal(normal.get("snapshot_blockhash"), None)
+ assert_equal(normal["validated"], True)
+ assert_equal(snapshot["blocks"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(snapshot["snapshot_blockhash"], dump_output["base_hash"])
+ assert_equal(snapshot["validated"], False)
+
+ assert_equal(n1.getblockchaininfo()["blocks"], SNAPSHOT_BASE_HEIGHT)
+
+ self.log.info(
+ "Submit a stale block that forked off the chain before the snapshot"
+ )
+ # Normally a block like this would not be downloaded, but if it is
+ # submitted early before the background chain catches up to the fork
+ # point, it winds up in m_blocks_unlinked and triggers a corner case
+ # that previously crashed CheckBlockIndex.
+ n1.submitblock(stale_block)
+ n1.getchaintips()
+ n1.getblock(stale_hash)
+
+ self.log.info(
+ "Submit a spending transaction for a snapshot chainstate coin to the mempool"
+ )
+ # spend the coinbase output of the first block that is not available on node1
+ spend_coin_blockhash = n1.getblockhash(START_HEIGHT + 1)
+ assert_raises_rpc_error(
+ -1, "Block not found on disk", n1.getblock, spend_coin_blockhash
+ )
+ prev_tx = n0.getblock(spend_coin_blockhash, 3)["tx"][0]
+ prevout = {
+ "txid": prev_tx["txid"],
+ "vout": 0,
+ "scriptPubKey": prev_tx["vout"][0]["scriptPubKey"]["hex"],
+ "amount": prev_tx["vout"][0]["value"],
+ }
+ privkey = n0.get_deterministic_priv_key().key
+ raw_tx = n1.createrawtransaction(
+ [prevout], {getnewdestination()[2]: 24_990_000}
+ )
+ signed_tx = n1.signrawtransactionwithkey(raw_tx, [privkey], [prevout])["hex"]
+ signed_txid = FromHex(CTransaction(), signed_tx).rehash()
+
+ assert n1.gettxout(prev_tx["txid"], 0) is not None
+ n1.sendrawtransaction(signed_tx)
+ assert signed_txid in n1.getrawmempool()
+ assert not n1.gettxout(prev_tx["txid"], 0)
+
+ PAUSE_HEIGHT = FINAL_HEIGHT - 40
+
+ self.log.info("Restarting node to stop at height %d", PAUSE_HEIGHT)
+ self.restart_node(
+ 1, extra_args=[f"-stopatheight={PAUSE_HEIGHT}", *self.extra_args[1]]
+ )
+
+ # Finally connect the nodes and let them sync.
+ #
+ # Set `wait_for_connect=False` to avoid a race between performing connection
+ # assertions and the -stopatheight tripping.
+ self.connect_nodes(0, 1, wait_for_connect=False)
+
+ n1.wait_until_stopped()
+
+ self.log.info("Checking that blocks are segmented on disk")
+ assert self.has_blockfile(n1, "00000"), "normal blockfile missing"
+ assert self.has_blockfile(n1, "00001"), "assumed blockfile missing"
+ assert not self.has_blockfile(n1, "00002"), "too many blockfiles"
+
+ self.log.info(
+ "Restarted node before snapshot validation completed, reloading..."
+ )
+ self.restart_node(1, extra_args=self.extra_args[1])
+
+ # Send snapshot block to n1 out of order. This makes the test less
+ # realistic because normally the snapshot block is one of the last
+ # blocks downloaded, but its useful to test because it triggers more
+ # corner cases in ReceivedBlockTransactions() and CheckBlockIndex()
+ # setting and testing nChainTx values, and it exposed previous bugs.
+ snapshot_hash = n0.getblockhash(SNAPSHOT_BASE_HEIGHT)
+ snapshot_block = n0.getblock(snapshot_hash, 0)
+ n1.submitblock(snapshot_block)
+
+ self.connect_nodes(0, 1)
+
+ self.log.info(f"Ensuring snapshot chain syncs to tip. ({FINAL_HEIGHT})")
+ self.wait_until(
+ lambda: n1.getchainstates()["chainstates"][-1]["blocks"] == FINAL_HEIGHT
+ )
+ self.sync_blocks(nodes=(n0, n1))
+
+ self.log.info("Ensuring background validation completes")
+ self.wait_until(lambda: len(n1.getchainstates()["chainstates"]) == 1)
+
+ # Ensure indexes have synced.
+ completed_idx_state = {
+ "basic block filter index": COMPLETE_IDX,
+ "coinstatsindex": COMPLETE_IDX,
+ }
+ self.wait_until(lambda: n1.getindexinfo() == completed_idx_state)
+
+ self.log.info("Re-check nTx and nChainTx values")
+ check_tx_counts(final=True)
+
+ for i in (0, 1):
+ n = self.nodes[i]
+ self.log.info(
+ f"Restarting node {i} to ensure (Check|Load)BlockIndex passes"
+ )
+ self.restart_node(i, extra_args=self.extra_args[i])
+
+ assert_equal(n.getblockchaininfo()["blocks"], FINAL_HEIGHT)
+
+ (chainstate,) = n.getchainstates()["chainstates"]
+ assert_equal(chainstate["blocks"], FINAL_HEIGHT)
+
+ if i != 0:
+ # Ensure indexes have synced for the assumeutxo node
+ self.wait_until(lambda: n.getindexinfo() == completed_idx_state)
+
+ # Node 2: all indexes + reindex
+ # -----------------------------
+
+ self.log.info("-- Testing all indexes + reindex")
+ assert_equal(n2.getblockcount(), START_HEIGHT)
+
+ self.log.info(f"Loading snapshot into third node from {dump_output['path']}")
+ loaded = n2.loadtxoutset(dump_output["path"])
+ assert_equal(loaded["coins_loaded"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(loaded["base_height"], SNAPSHOT_BASE_HEIGHT)
+
+ for reindex_arg in ["-reindex=1", "-reindex-chainstate=1"]:
+ self.log.info(
+ f"Check that restarting with {reindex_arg} will delete the snapshot chainstate"
+ )
+ self.restart_node(2, extra_args=[reindex_arg, *self.extra_args[2]])
+ assert_equal(1, len(n2.getchainstates()["chainstates"]))
+ for i in range(1, 300):
+ block = n0.getblock(n0.getblockhash(i), 0)
+ n2.submitheader(block)
+ loaded = n2.loadtxoutset(dump_output["path"])
+ assert_equal(loaded["coins_loaded"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(loaded["base_height"], SNAPSHOT_BASE_HEIGHT)
+
+ normal, snapshot = n2.getchainstates()["chainstates"]
+ assert_equal(normal["blocks"], START_HEIGHT)
+ assert_equal(normal.get("snapshot_blockhash"), None)
+ assert_equal(normal["validated"], True)
+ assert_equal(snapshot["blocks"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(snapshot["snapshot_blockhash"], dump_output["base_hash"])
+ assert_equal(snapshot["validated"], False)
+
+ self.log.info(
+ "Check that loading the snapshot again will fail because there is already an active snapshot."
+ )
+ with n2.assert_debug_log(
+ expected_msgs=[
+ "[snapshot] can't activate a snapshot-based chainstate more than once"
+ ]
+ ):
+ assert_raises_rpc_error(
+ -32603,
+ "Unable to load UTXO snapshot",
+ n2.loadtxoutset,
+ dump_output["path"],
+ )
+
+ self.connect_nodes(0, 2)
+ self.wait_until(
+ lambda: n2.getchainstates()["chainstates"][-1]["blocks"] == FINAL_HEIGHT
+ )
+ self.sync_blocks()
+
+ self.log.info("Ensuring background validation completes")
+ self.wait_until(lambda: len(n2.getchainstates()["chainstates"]) == 1)
+
+ completed_idx_state = {
+ "basic block filter index": COMPLETE_IDX,
+ "coinstatsindex": COMPLETE_IDX,
+ "txindex": COMPLETE_IDX,
+ }
+ self.wait_until(lambda: n2.getindexinfo() == completed_idx_state)
+
+ for i in (0, 2):
+ n = self.nodes[i]
+ self.log.info(
+ f"Restarting node {i} to ensure (Check|Load)BlockIndex passes"
+ )
+ self.restart_node(i, extra_args=self.extra_args[i])
+
+ assert_equal(n.getblockchaininfo()["blocks"], FINAL_HEIGHT)
+
+ (chainstate,) = n.getchainstates()["chainstates"]
+ assert_equal(chainstate["blocks"], FINAL_HEIGHT)
+
+ if i != 0:
+ # Ensure indexes have synced for the assumeutxo node
+ self.wait_until(lambda: n.getindexinfo() == completed_idx_state)
+
+ self.log.info("Test -reindex-chainstate of an assumeutxo-synced node")
+ self.restart_node(2, extra_args=["-reindex-chainstate=1", *self.extra_args[2]])
+ assert_equal(n2.getblockchaininfo()["blocks"], FINAL_HEIGHT)
+ self.wait_until(lambda: n2.getblockcount() == FINAL_HEIGHT)
+
+ self.log.info("Test -reindex of an assumeutxo-synced node")
+ self.restart_node(2, extra_args=["-reindex=1", *self.extra_args[2]])
+ self.connect_nodes(0, 2)
+ self.wait_until(lambda: n2.getblockcount() == FINAL_HEIGHT)
+
+
+@dataclass
+class Block:
+ hash: str
+ tx: int
+ chain_tx: int
+
+
+if __name__ == "__main__":
+ AssumeutxoTest().main()
diff --git a/test/functional/test_framework/test_framework.py b/test/functional/test_framework/test_framework.py
--- a/test/functional/test_framework/test_framework.py
+++ b/test/functional/test_framework/test_framework.py
@@ -670,7 +670,14 @@
def wait_for_node_exit(self, i, timeout):
self.nodes[i].process.wait(timeout)
- def connect_nodes(self, a, b):
+ def connect_nodes(self, a, b, *, wait_for_connect: bool = True):
+ """
+ Kwargs:
+ wait_for_connect: if True, block until the nodes are verified as connected. You might
+ want to disable this when using -stopatheight with one of the connected nodes,
+ since there will be a race between the actual connection and performing
+ the assertions before one node shuts down.
+ """
from_connection = self.nodes[a]
to_connection = self.nodes[b]
@@ -680,6 +687,9 @@
ip_port = f"{host}:{str(to_connection.p2p_port)}"
from_connection.addnode(ip_port, "onetry")
+ if not wait_for_connect:
+ return
+
# Use subversion as peer id. Test nodes have their node number appended to the user agent string
from_connection_subver = from_connection.getnetworkinfo()["subversion"]
to_connection_subver = to_connection.getnetworkinfo()["subversion"]
@@ -1133,3 +1143,7 @@
def is_usdt_compiled(self):
"""Checks whether the USDT tracepoints were compiled."""
return self.config["components"].getboolean("ENABLE_USDT_TRACEPOINTS")
+
+ def has_blockfile(self, node, filenum: str):
+ blocksdir = os.path.join(node.datadir, self.chain, "blocks", "")
+ return os.path.isfile(os.path.join(blocksdir, f"blk{filenum}.dat"))
diff --git a/test/functional/test_framework/wallet.py b/test/functional/test_framework/wallet.py
--- a/test/functional/test_framework/wallet.py
+++ b/test/functional/test_framework/wallet.py
@@ -8,6 +8,7 @@
from enum import Enum
from typing import Any, Optional
+from test_framework import cashaddr
from test_framework.address import (
ADDRESS_ECREG_P2SH_OP_TRUE,
SCRIPTSIG_OP_TRUE,
@@ -473,3 +474,13 @@
# TODO: also support other address formats
else:
assert False
+
+
+def cashaddr_to_scriptpubkey(address: str) -> CScript:
+ """Converts a given CashAddress to the corresponding output script (scriptPubKey)."""
+ prefix, kind, addr_hash = cashaddr.decode(address)
+ if kind == cashaddr.PUBKEY_TYPE:
+ return CScript([OP_DUP, OP_HASH160, addr_hash, OP_EQUALVERIFY, OP_CHECKSIG])
+ if kind == cashaddr.SCRIPT_TYPE:
+ return CScript([OP_HASH160, addr_hash, OP_EQUAL])
+ assert False
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -132,6 +132,7 @@
"wallet_createwallet.py": [["--usecli"], ["--descriptors"]],
"wallet_encryption.py": [["--descriptors"]],
"wallet_hd.py": [["--descriptors"]],
+ "wallet_assumeutxo.py": [["--descriptors"]],
"wallet_importprunedfunds.py": [["--descriptors"]],
# FIXME: "wallet_keypool.py": [["--descriptors"]],
"wallet_keypool_topup.py": [["--descriptors"]],
diff --git a/test/functional/wallet_assumeutxo.py b/test/functional/wallet_assumeutxo.py
new file mode 100644
--- /dev/null
+++ b/test/functional/wallet_assumeutxo.py
@@ -0,0 +1,258 @@
+# Copyright (c) 2023-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test for assumeutxo wallet related behavior.
+See feature_assumeutxo.py for background.
+
+## Possible test improvements
+
+- TODO: test loading a wallet (backup) on a pruned node
+
+"""
+from test_framework.descriptors import descsum_create
+from test_framework.messages import COIN
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_rpc_error, ensure_for
+from test_framework.wallet import MiniWallet, cashaddr_to_scriptpubkey
+from test_framework.wallet_util import get_generate_key
+
+START_HEIGHT = 199
+SNAPSHOT_BASE_HEIGHT = 299
+FINAL_HEIGHT = 399
+
+
+class AssumeutxoTest(BitcoinTestFramework):
+ def skip_test_if_missing_module(self):
+ self.skip_if_no_wallet()
+
+ def set_test_params(self):
+ """Use the pregenerated, deterministic chain up to height 199."""
+ self.num_nodes = 3
+ self.rpc_timeout = 120
+ self.extra_args = [
+ [],
+ [],
+ [],
+ ]
+
+ def setup_network(self):
+ """Start with the nodes disconnected so that one can generate a snapshot
+ including blocks the other hasn't yet seen."""
+ self.add_nodes(3)
+ self.start_nodes(extra_args=self.extra_args)
+
+ def import_descriptor(self, node, wallet_name, key, timestamp):
+ import_request = [
+ {
+ "desc": descsum_create("pkh(" + key.pubkey + ")"),
+ "timestamp": timestamp,
+ "label": "Descriptor import test",
+ }
+ ]
+ wrpc = node.get_wallet_rpc(wallet_name)
+ return wrpc.importdescriptors(import_request)
+
+ def run_test(self):
+ """
+ Bring up two (disconnected) nodes, mine some new blocks on the first,
+ and generate a UTXO snapshot.
+
+ Load the snapshot into the second, ensure it syncs to tip and completes
+ background validation when connected to the first.
+ """
+ n0 = self.nodes[0]
+ n1 = self.nodes[1]
+ n2 = self.nodes[2]
+
+ self.mini_wallet = MiniWallet(n0)
+
+ # Mock time for a deterministic chain
+ for n in self.nodes:
+ n.setmocktime(n.getblockheader(n.getbestblockhash())["time"])
+
+ # Create a wallet that we will create a backup for later (at snapshot height)
+ n0.createwallet("w")
+ w = n0.get_wallet_rpc("w")
+ w_address = w.getnewaddress()
+
+ # Create another wallet and backup now (before snapshot height)
+ n0.createwallet("w2")
+ w2 = n0.get_wallet_rpc("w2")
+ w2_address = w2.getnewaddress()
+ w2.backupwallet("backup_w2.dat")
+
+ # Generate a series of blocks that `n0` will have in the snapshot,
+ # but that n1 doesn't yet see. In order for the snapshot to activate,
+ # though, we have to ferry over the new headers to n1 so that it
+ # isn't waiting forever to see the header of the snapshot's base block
+ # while disconnected from n0.
+ for i in range(100):
+ if i % 3 == 0:
+ self.mini_wallet.send_self_transfer(from_node=n0)
+ self.generate(n0, nblocks=1, sync_fun=self.no_op)
+ newblock = n0.getblock(n0.getbestblockhash(), 0)
+
+ # make n1 aware of the new header, but don't give it the block.
+ n1.submitheader(newblock)
+ n2.submitheader(newblock)
+
+ # Ensure everyone is seeing the same headers.
+ for n in self.nodes:
+ assert_equal(n.getblockchaininfo()["headers"], SNAPSHOT_BASE_HEIGHT)
+
+ # This backup is created at the snapshot height, so it's
+ # not part of the background sync anymore
+ w.backupwallet("backup_w.dat")
+
+ self.log.info("-- Testing assumeutxo")
+
+ assert_equal(n0.getblockcount(), SNAPSHOT_BASE_HEIGHT)
+ assert_equal(n1.getblockcount(), START_HEIGHT)
+
+ self.log.info(f"Creating a UTXO snapshot at height {SNAPSHOT_BASE_HEIGHT}")
+ dump_output = n0.dumptxoutset("utxos.dat")
+
+ assert_equal(
+ dump_output["txoutset_hash"],
+ "a966794ed5a2f9debaefc7ca48dbc5d5e12a89ff9fe45bd00ec5732d074580a9",
+ )
+ assert_equal(dump_output["nchaintx"], 334)
+ assert_equal(n0.getblockchaininfo()["blocks"], SNAPSHOT_BASE_HEIGHT)
+
+ # Mine more blocks on top of the snapshot that n1 hasn't yet seen. This
+ # will allow us to test n1's sync-to-tip on top of a snapshot.
+ w_skp = cashaddr_to_scriptpubkey(w_address)
+ w2_skp = cashaddr_to_scriptpubkey(w2_address)
+ for i in range(100):
+ if i % 3 == 0:
+ self.mini_wallet.send_to(
+ from_node=n0, scriptPubKey=w_skp, amount=1 * COIN
+ )
+ self.mini_wallet.send_to(
+ from_node=n0, scriptPubKey=w2_skp, amount=10 * COIN
+ )
+ self.generate(n0, nblocks=1, sync_fun=self.no_op)
+
+ assert_equal(n0.getblockcount(), FINAL_HEIGHT)
+ assert_equal(n1.getblockcount(), START_HEIGHT)
+ assert_equal(n2.getblockcount(), START_HEIGHT)
+
+ assert_equal(n0.getblockchaininfo()["blocks"], FINAL_HEIGHT)
+
+ self.log.info(f"Loading snapshot into second node from {dump_output['path']}")
+ loaded = n1.loadtxoutset(dump_output["path"])
+ assert_equal(loaded["coins_loaded"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(loaded["base_height"], SNAPSHOT_BASE_HEIGHT)
+
+ normal, snapshot = n1.getchainstates()["chainstates"]
+ assert_equal(normal["blocks"], START_HEIGHT)
+ assert_equal(normal.get("snapshot_blockhash"), None)
+ assert_equal(normal["validated"], True)
+ assert_equal(snapshot["blocks"], SNAPSHOT_BASE_HEIGHT)
+ assert_equal(snapshot["snapshot_blockhash"], dump_output["base_hash"])
+ assert_equal(snapshot["validated"], False)
+
+ assert_equal(n1.getblockchaininfo()["blocks"], SNAPSHOT_BASE_HEIGHT)
+
+ self.log.info(
+ "Backup from the snapshot height can be loaded during background sync"
+ )
+ n1.restorewallet("w", "backup_w.dat")
+ # Balance of w wallet is still still 0 because n1 has not synced yet
+ assert_equal(n1.getbalance(), 0)
+
+ self.log.info(
+ "Backup from before the snapshot height can't be loaded during background sync"
+ )
+ assert_raises_rpc_error(
+ -4,
+ "Wallet loading failed. Error loading wallet. Wallet requires blocks to be downloaded, and software does not currently support loading wallets while blocks are being downloaded out of order when using assumeutxo snapshots. Wallet should be able to load successfully after node sync reaches height 299",
+ n1.restorewallet,
+ "w2",
+ "backup_w2.dat",
+ )
+
+ if self.options.descriptors:
+ self.log.info("Test loading descriptors during background sync")
+ wallet_name = "w1"
+ n1.createwallet(wallet_name, disable_private_keys=True)
+ key = get_generate_key()
+ time = n1.getblockchaininfo()["time"]
+ timestamp = 0
+ expected_error_message = (
+ f"Rescan failed for descriptor with creation timestamp {timestamp}. There "
+ f"was an error reading a block from time {time}, which is after or within "
+ f"7200 seconds of key creation, and could contain transactions pertaining "
+ f"to the descriptor. As a result, transactions and coins using this "
+ "descriptor may not appear in the wallet. This error is likely caused by "
+ "an in-progress assumeutxo background sync. Check logs or getchainstates "
+ "RPC for assumeutxo background sync progress and try again later."
+ )
+ result = self.import_descriptor(n1, wallet_name, key, timestamp)
+ assert_equal(result[0]["error"]["code"], -1)
+ assert_equal(result[0]["error"]["message"], expected_error_message)
+
+ PAUSE_HEIGHT = FINAL_HEIGHT - 40
+
+ self.log.info("Restarting node to stop at height %d", PAUSE_HEIGHT)
+ self.restart_node(
+ 1, extra_args=[f"-stopatheight={PAUSE_HEIGHT}", *self.extra_args[1]]
+ )
+
+ # Finally connect the nodes and let them sync.
+ #
+ # Set `wait_for_connect=False` to avoid a race between performing connection
+ # assertions and the -stopatheight tripping.
+ self.connect_nodes(0, 1, wait_for_connect=False)
+
+ n1.wait_until_stopped()
+
+ self.log.info(
+ "Restarted node before snapshot validation completed, reloading..."
+ )
+ self.restart_node(1, extra_args=self.extra_args[1])
+
+ # TODO: inspect state of e.g. the wallet before reconnecting
+ self.connect_nodes(0, 1)
+
+ self.log.info(f"Ensuring snapshot chain syncs to tip. ({FINAL_HEIGHT})")
+ self.wait_until(
+ lambda: n1.getchainstates()["chainstates"][-1]["blocks"] == FINAL_HEIGHT
+ )
+ self.sync_blocks(nodes=(n0, n1))
+
+ self.log.info("Ensuring background validation completes")
+ self.wait_until(lambda: len(n1.getchainstates()["chainstates"]) == 1)
+
+ self.log.info(
+ "Ensuring wallet can be restored from a backup that was created before the snapshot height"
+ )
+ # fixme: figure out why we can't reuse the wallet name w2 in the
+ # following test (test_framework.authproxy.JSONRPCException: Wallet name already exists. (-8))
+ n1.restorewallet("w2_bis", "backup_w2.dat")
+ # Check balance of w2 wallet
+ assert_equal(n1.getbalance(), 340_000_000)
+
+ # Check balance of w wallet after node is synced
+ n1.loadwallet("w")
+ w = n1.get_wallet_rpc("w")
+ assert_equal(w.getbalance(), 34_000_000)
+
+ self.log.info(
+ "Check balance of a wallet that is active during snapshot completion"
+ )
+ n2.restorewallet("w", "backup_w.dat")
+ loaded = n2.loadtxoutset(dump_output["path"])
+ self.connect_nodes(0, 2)
+ self.wait_until(lambda: len(n2.getchainstates()["chainstates"]) == 1)
+ ensure_for(duration=1, f=lambda: (n2.getbalance() == 34_000_000))
+
+ if self.options.descriptors:
+ self.log.info("Ensuring descriptors can be loaded after background sync")
+ n1.loadwallet(wallet_name)
+ result = self.import_descriptor(n1, wallet_name, key, timestamp)
+ assert_equal(result[0]["success"], True)
+
+
+if __name__ == "__main__":
+ AssumeutxoTest().main()

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