Remove variables used for keeping track of mempool transactions for
which we haven't processed the parents yet. Since we're iterating in
topological order now, they're always unused.
No behavior changes.
Before, we're always adding transactions to the "check later" queue if
they have any parents in the mempool. But there's no reason to do this
if all of its inputs are already available from mempoolDuplicate.
Instead, check for inputs, and only mark fDependsWait=true if the
parents haven't been processed yet.
Reduce the amount of "check later" transactions by looking at
ancestors before descendants. Do this by iterating through them in
ascending order by ancestor count. This works because a child will
always have more in-mempool ancestors than its parent.
We should never have any entries in the "check later" queue
after this commit.
This removes a bunch of boilerplate, makes the code easier to read.
Also, C++11 member initialization avoids accidental uninitialized
members.
Can be reviewed with the git option "--word-diff-regex=." or with "git
difftool --tool=meld".
When calculating ancestor/descendant counts for transactions in the
package, as a heuristic, count every transaction in the package as an
ancestor and descendant of every other transaction in the package.
This may overestimate, but will not underestimate, the
ancestor/descendant counts. This shortcut still produces an accurate
count for packages of 1 parent + 1 child.
This does not change existing behavior.
The ancestor/descendant limits are inclusive of the entries themselves,
but CalculateAncestorsAndCheckLimits() does not need access to them.
Allow CheckSequenceLocks to use heights and coins from any CoinsView and
CBlockIndex provided. This means that CheckSequenceLocks() doesn't need
to hold the mempool lock or cs_main. The caller is responsible for
ensuring the CoinsView and CBlockIndex are consistent before passing
them in. The typical usage is still to create a CCoinsViewMemPool from
the mempool and grab the CBlockIndex from the chainstate tip.
In #21415 we decided to return `std::optional` rather than `{}` for
uninitialized values. This PR repalces the two remaining usages of `{}`
with `std::nullopt`.
As a side-effect, this also quells the spurious GCC 10.2.x warning that
we've had reported quite a few times. i.e #21318, #21248, #20797.
```bash
txmempool.cpp: In member function ‘CTxMemPool::setEntries CTxMemPool::GetIterSet(const std::set<uint256>&) const’:
txmempool.cpp:898:13: warning: ‘<anonymous>’ may be used uninitialized in this function [-Wmaybe-uninitialized]
898 | return {};
| ^
```
e11b649650 validation: CVerifyDB::VerifyDB: Use locking annotation (Carl Dong)
03f75c42e1 validation: Use existing chain member in CChainState::LoadGenesisBlock (Carl Dong)
5e4af77380 validation: Use existing chain member in CChainState::AcceptBlock (Carl Dong)
fee73347c0 validation: Pass in chain to FindBlockPos+SaveBlockToDisk (Carl Dong)
a9d28bcd8d validation: Use *this in CChainState::ActivateBestChainStep (Carl Dong)
4744efc9ba validation: Pass in chainstate to CTxMemPool::check (Carl Dong)
1fb7b2c595 validation: Use *this in CChainState::InvalidateBlock (Carl Dong)
8cdb2f7e58 validation: Move LoadBlockIndexDB to CChainState (Carl Dong)
8b99efbcc0 validation: Move invalid block handling to CChainState (Carl Dong)
2bdf37fe18 validation: Pass in chainstate to CVerifyDB::VerifyDB (Carl Dong)
31eac50c72 validation: Remove global ::VersionBitsTip{State,SinceHeight,Statistics} (Carl Dong)
63e4c7316a validation: Pass in chainstate to ::PruneBlockFilesManual (Carl Dong)
4bada76237 validation: Pass in chainstate to UpdateTip (Carl Dong)
a3ba08ba7d validation: Remove global ::{{Precious,Invalidate}Block,ResetBlockFailureFlags} (Carl Dong)
4927c9e699 validation: Remove global ::LoadGenesisBlock (Carl Dong)
9da106be4d validation: Check chain tip is non-null in CheckFinalTx (Carl Dong)
Pull request description:
Overall PR: #20158 (tree-wide: De-globalize ChainstateManager)
Based on:
- [x] #20750 | [Bundle 2/n] Prune g_chainman usage in mempool-related validation functions
Note to reviewers:
1. This bundle may _apparently_ introduce usage of `g_chainman` or `::Chain(state|)Active()` globals, but these are resolved later on in the overall PR. [Commits of overall PR](https://github.com/bitcoin/bitcoin/pull/20158/commits)
2. There may be seemingly obvious local references to `ChainstateManager` or other validation objects which are not being used in callers of the current function in question, this is done intentionally to **_keep each commit centered around one function/method_** to ease review and to make the overall change systematic. We don't assume anything about our callers. Rest assured that once we are considering that particular caller in later commits, we will use the obvious local references. [Commits of overall PR](https://github.com/bitcoin/bitcoin/pull/20158/commits)
3. When changing a function/method that has many callers (e.g. `LookupBlockIndex` with 55 callers), it is sometimes easier (and less error-prone) to use a scripted-diff. When doing so, there will be 3 commits in sequence so that every commit compiles like so:
1. Add `new_function`, make `old_function` a wrapper of `new_function`, divert all calls to `old_function` to `new_function` **in the local module only**
2. Scripted-diff to divert all calls to `old_function` to `new_function` **in the rest of the codebase**
3. Remove `old_function`
Note to self:
- [x] Address: https://github.com/bitcoin/bitcoin/pull/20750#discussion_r579400663
ACKs for top commit:
laanwj:
Code review ACK e11b649650
Tree-SHA512: 205a451a741e32f17d5966de289f2f5a3f0817738c0087b70ff4755ddd217b53d01050ed396669bda2b1d216a88d927b9778777f9ff95ab1fe20e59c5f341776
fd6580e405 [refactor] txmempool: split epoch logic into class (Anthony Towns)
Pull request description:
Splits the epoch logic introduced in #17925 into a separate class.
Uses clang's thread safety annotations and encapsulates the data more strongly to reduce chances of bugs from API misuse.
ACKs for top commit:
jonatack:
ACK fd6580e405 using clang thread safety annotations looks like a very good idea, and the encapsulation this change adds should improve robustness (and possible unit test-ability) of the code. Verified that changing some of the locking duly provoked build-time warnings with Clang 9 on Debian and that small changes in the new `Epoch` class were covered by failing functional test assertions in `mempool_updatefromblock.py`, `mempool_resurrect.py`, and `mempool_reorg.py`
hebasto:
re-ACK fd6580e405, since my [previous](https://github.com/bitcoin/bitcoin/pull/18017#pullrequestreview-569619362) review:
Tree-SHA512: 7004623faa02b56639aa05ab7a078320a6d8d54ec62d8022876221e33f350f47df51ddff056c0de5be798f8eb39b5c03c2d3f035698555d70abc218e950f2f8c
Several other parameters are now redundant since they can be safely
obtained from the chainstate given that ::cs_main is locked. These are
now removed.
fa362064e3 rpc: Return total fee in mempool (MarcoFalke)
Pull request description:
This avoids having to loop over the whole mempool to query each entry's fee
ACKs for top commit:
achow101:
ACK fa362064e3
glozow:
ACK fa362064e3🧸
jnewbery:
ACK fa362064e3
Tree-SHA512: e2fa1664df39c9e187f9229fc35764ccf436f6f75889c5a206d34fff473fc21efbf2bb143f4ca7895c27659218c22884d0ec4195e7a536a5a96973fc9dd82d08
[META] This commit should be followed up by removing the comments and
assertions meant only to show that the change is correct.
GetSpendHeight only acts on BlockManager.
Currently, CTxMemPool::check locks CTxMemPool's own cs member, then
calls GetSpendHeight which locks cs_main. This can potentially cause an
undesirable lock invesion since CTxMemPool's cs is supposed to be locked
after cs_main.
This does not cause us any problems right now because all callers of
CTxMemPool already lock cs_main before calling CTxMemPool::check, which
means that the LOCK(cs_main) in GetSpendHeight becomes benign.
However, it is currently possible for new code to be added which calls
CTxMemPool::check without locking cs_main (which would be dangerous).
Therefore we should make it explicit that cs_main needs to be held
before calling CTxMemPool::check.
NOTE: After all review-only assertions are removed in "#20158 |
tree-wide: De-globalize ChainstateManager", and assuming that we
keep the changes in "validation: Pass in spendheight to
CTxMemPool::check", we can re-evaluate to see if this annotation
is still necessary.
281fd1a4a0 Replace KeyIDHasher with SaltedSipHasher (Andrew Chow)
210b693db6 Add generic SaltedSipHasher (Andrew Chow)
95e61c1cf2 Move Hashers to util/hasher.{cpp/h} (Andrew Chow)
Pull request description:
There are existing `SaltedOutPointHasher` and `SaltedTxidHasher` classes used for `std::unordered_map` and `std::unordered_set` that could be useful in other places in the codebase. So we these to their own `saltedhash.{cpp/h}` file. An existing `KeyIDHasher` is moved there too. Additionally, `ScriptIDHasher`, `SaltedPubkeyHasher`, and `SaltedScriptHasher` are added so that they can be used in future work.
`KeyIDHasher` and `ScriptIDHasher` are not salted so that equality comparisons of maps and sets keyed by `CKeyID` and `CScriptID` will actually work.
Split from #19602 (and a few other PRs/branches I have).
ACKs for top commit:
laanwj:
Code review ACK 281fd1a4a0
jonatack:
ACK 281fd1a4a0, code review, debug build and ran bitcoind after rebasing to master @ dff0f6f753
fjahr:
utACK 281fd1a4a0
Tree-SHA512: bb03b231ccf3c9ecefc997b8da9c3770af4819f9be5b0a72997a103864e84046a2ac39b8eadf0dc9247bdccd53f86f433642e3a098882e6748341a9e7736271b
Move the hashers that we use for hash tables to a common place.
Moved hashers:
- SaltedTxidHasher
- SaltedOutpointHasher
- FilterHeaderHasher
- SignatureCacheHasher
- BlockHasher
Since m_check_ratio is only set once and since the CTxMemPool object is
no longer a global variable, m_check_ratio can be passed into the
constructor of CTxMemPool. Since it is only read from after
initialization, m_check_ratio can also be made a const and hence no
longer needs to be guarded by the cs mutex.
Using the zmq notifications to avoid excessive mempool polling can be difficult
given the current notifications available. It announces all transactions
being added to mempool or included in blocks, but announces no evictions
and gives no indication if the transaction is in the mempool or a block.
Block notifications for zmq are also substandard, in that it only announces
block tips, while all block transactions are still announced.
This commit adds a unified stream which can be used to closely track mempool:
1) getrawmempool to fill out mempool knowledge
2) if txhash is announced, add or remove from set
based on add/remove flag
3) if blockhash is announced, get block txn list,
remove from those transactions local view of mempool
4) if we drop a sequence number, go to (1)
The mempool sequence number starts at the value 1, and
increments each time a transaction enters the mempool,
or is evicted from the mempool for any reason, including
block inclusion. The mempool sequence number is published
via ZMQ for any transaction-related notification.
These features allow for ZMQ/RPC consumer to track mempool
state in a more exacting way, without unnecesarily polling
getrawmempool. See interface_zmq.py::test_mempool_sync for
example usage.
This fix is a based on the fix by Antoine Riard <ariard@student.42.fr> in
https://github.com/bitcoin/bitcoin/pull/18600.
Unlike that PR, which implements some new behavior, this just restores previous
wallet notification and status behavior for transactions removed from the
mempool because they conflict with transactions in a block. The behavior was
accidentally changed in two `CWallet::BlockConnected` updates:
a31be09bfd and
7e89994133 from
https://github.com/bitcoin/bitcoin/pull/16624, causing issue
https://github.com/bitcoin/bitcoin/issues/18325.
The change here could be improved and replaced with a more comprehensive
cleanup, so it includes a detailed comment explaining future considerations.
Fixes#18325
Co-authored-by: Antoine Riard <ariard@student.42.fr>
50fc4df6c4 [mempool] Persist unbroadcast set to mempool.dat (Amiti Uttarwar)
297a178536 [test] Integration tests for unbroadcast functionality (Amiti Uttarwar)
6851502472 [refactor/test] Extract P2PTxInvStore into test framework (Amiti Uttarwar)
dc1da48dc5 [wallet] Update the rebroadcast frequency to be ~1/day. (Amiti Uttarwar)
e25e42f20a [p2p] Reattempt initial send of unbroadcast transactions (Amiti Uttarwar)
7e93eecce3 [util] Add method that returns random time in milliseconds (Amiti Uttarwar)
89eeb4a333 [mempool] Track "unbroadcast" transactions (Amiti Uttarwar)
Pull request description:
This PR introduces mempool tracking of unbroadcast transactions and periodic reattempts at initial broadcast. This is a part of the rebroadcast project, and a standalone privacy win.
The current rebroadcast logic is terrible for privacy because 1. only the source wallet rebroadcasts transactions and 2. it does so quite frequently. In the current system, if a user submits a transaction that does not immediately get broadcast to the network (eg. they are offline), this "rebroadcast" behavior is the safety net that can actually serve as the initial broadcast. So, keeping the attempts frequent is important for initial delivery within a reasonable timespan.
This PR aims to improve # 2 by reducing the wallet rebroadcast frequency to ~1/day from ~1/15 min. It achieves this by separating the notion of initial broadcast from rebroadcasts. With these changes, the mempool tracks locally submitted transactions & periodically reattempts initial broadcast. Transactions submitted via the wallet or RPC are added to an "unbroadcast" set & are removed when a peer sends a `getdata` request, or the transaction is removed from the mempool. Every 10-15 minutes, the node reattempts an initial broadcast. This enables reducing the wallet rebroadcast frequency while ensuring the transactions will be propagated to the network.
For privacy improvements around # 1, please see #16698.
Thank you to gmaxwell for the idea of how to break out this subset of functionality (https://github.com/bitcoin/bitcoin/pull/16698#issuecomment-571399346)
ACKs for top commit:
fjahr:
Code review ACK 50fc4df6c4
MarcoFalke:
ACK 50fc4df6c4, I think this is ready for merge now 👻
amitiuttarwar:
The current tip `50fc4df` currently has 6 ACKs on it, so I've opened #18807 to address the last bits.
jnewbery:
utACK 50fc4df6c4.
ariard:
Code Review ACK 50fc4df (minor points no need to invalid other ACKs)
robot-visions:
ACK 50fc4df6c4
sipa:
utACK 50fc4df6c4
naumenkogs:
utACK 50fc4df
Tree-SHA512: 2dd935d645d5e209f8abf87bfaa3ef0e4492705ce7e89ea64279cb27ffd37f4727fa94ad62d41be331177332f8edbebf3c7f4972f8cda10dd951b80a28ab3c0f
- Mempool tracks locally submitted transactions (wallet or rpc)
- Transactions are removed from set when the node receives a GETDATA request
from a peer, or if the transaction is removed from the mempool.
NotifyEntryAdded never had any subscribers so can be removed.
Since ConnectTrace no longer subscribes to NotifyEntryRemoved, there are
now no subscribers.
The CValidationInterface TransactionAddedToMempool and
TransactionRemovedFromMempool methods can now provide this
functionality. There's no need for a special notifications framework for
the mempool.
The only CValidationInterface client that cares about transactions that
are removed from the mempool because of CONFLICT is the wallet.
Start using the TransactionRemovedFromMempool method to notify about
conflicted transactions instead of using the vtxConflicted vector in
BlockConnected.
d314e8a818 refactor: Replace all uses of boost::optional with our own Optional type (Wladimir J. van der Laan)
Pull request description:
Replace all uses of boost::optional with our own Optional type. Luckily, there aren't so many.
After this:
- `boost::optional` is no longer used directly (only through `Optional` which is an alias for it)
- `boost/optional.hpp` is only included in one place
ACKs for top commit:
MarcoFalke:
ACK d314e8a818
practicalswift:
ACK d314e8a818 -- diff looks correct + satisfying to see incremental progress towards the goal of a Boost free future :)
jtimon:
ACK d314e8a818
fanquake:
ACK d314e8a818
Tree-SHA512: b43e0017af81b07b5851377cd09624f114510ac5b9018d037664b58ad0fc8e893e30946b61f8f5e21e39125925bf9998a81f2226b468aab2df653ee57ed3213d
After this:
- `boost::optional` is no longer used directly (only through `Optional`
which is an alias for it)
- `boost/optional.hpp` is only included in one place
effe81f750 Move g_is_mempool_loaded into CTxMemPool::m_is_loaded (Ben Woosley)
bb8ae2c419 rpc: Expose g_is_mempool_loaded via getmempoolinfo and /rest/mempool/info.json (Ben Woosley)
Pull request description:
And use it to fix a race condition in mempool_persist.py:
https://travis-ci.org/Empact/bitcoin/jobs/487577243
Since e.g. getrawmempool returns errors based on this status, this
enables users to test it for readiness.
Fixes#12863
ACKs for commit effe81:
MarcoFalke:
utACK effe81f750
jnewbery:
utACK effe81f750
Tree-SHA512: 74328b0c17a97efb8a000d4ee49b9a673c2b6dde7ea30c43a6a2eff961a233351c9471f9a42344412135786c02bdf2ee1b2526651bb8fed68bd94d2120c4ef86
This moves the following policy settings functions and globals to a new
src/policy/settings unit in lib_server:
- `incrementalRelayFee`
- `dustRelayFee`
- `nBytesPerSigOp`
- `fIsBareMultisigStd`
These settings are only required by the node and should not be accessed
by other libraries.
f34c8c466a Make objects in range declarations immutable by default. Avoid unnecessary copying of objects in range declarations. (practicalswift)
Pull request description:
Make objects in range declarations immutable by default.
Rationale:
* Immutable objects are easier to reason about.
* Prevents accidental or hard-to-notice change of value.
Tree-SHA512: cad69d35f0cf8a938b848e65dd537c621d96fe3369be306b65ef0cd1baf6cc0a9f28bc230e1e383d810c555a6743d08cb6b2b0bd51856d4611f537a12e5abb8b
fa587773e5 scripted-diff: Remove unused first argument to addUnchecked (MarcoFalke)
fe5c49766c tx pool: Use the entry's hash instead of the one passed to addUnchecked (MarcoFalke)
ddd395f968 Mark CTxMemPoolEntry members that should not be modified const (MarcoFalke)
Pull request description:
Several years ago the transaction hash was not cached. For optimization the hash was instead passed into `addUnchecked` to avoid re-calculating it. See f77654a0e9
Passing in the hash is now redundant and the argument can safely be removed.
Tree-SHA512: 0206b65c7a014295f67574120e8c5397bf1b1bd70c918ae1360ab093676f7f89a6f084fd2c7000a141baebfe63fe6f515559e38c4ac71810ba64f949f9c0467f
3fc20632a3 qt: Set BLOCK_CHAIN_SIZE = 220 (DrahtBot)
2b6a2f4a28 Regenerate manpages (DrahtBot)
eb7daf4d60 Update copyright headers to 2018 (DrahtBot)
Pull request description:
Some trivial maintenance to avoid having to do it again after the 0.17 branch off.
(The scripts to do this are in `./contrib/`)
Tree-SHA512: 16b2af45e0351b1c691c5311d48025dc6828079e98c2aa2e600dc5910ee8aa01858ca6c356538150dc46fe14c8819ed8ec8e4ec9a0f682b9950dd41bc50518fa
01a06d6686 Avoid locking mutexes that are already held by the same thread (practicalswift)
Pull request description:
Avoid locking mutexes that are already held by the same thread. These are reentrant mutexes, but still no need to lock them more than once per thread :-)
Tree-SHA512: e2fb85882e8800892fd8e8170f3c13128d6acfeb14d7b69fb9555f2b7ad0884fb201cf945b8144ffaf6fb1253c28af7c8c6c435319a7ae30ca003f28aa645a98
f77e1d34fd test: Add MempoolAncestryTests (Karl-Johan Alm)
a08d76bcfe mempool: Calculate descendant maximum thoroughly (Karl-Johan Alm)
6d3568371e wallet: Switch to using ancestor/descendant limits (Karl-Johan Alm)
6888195b06 wallet: Strictly greater than for ancestor caps (Karl-Johan Alm)
322b12ac4e Remove deprecated TransactionWithinChainLimit (Karl-Johan Alm)
4784751547 Switch to GetTransactionAncestry() in OutputEligibleForSpending (Karl-Johan Alm)
475a385a80 Add GetTransactionAncestry to CTxMemPool for general purpose chain limit checking (Karl-Johan Alm)
46847d69d2 mempool: Fix max descendants check (Karl-Johan Alm)
b9ef21dd72 mempool: Add explicit max_descendants (Karl-Johan Alm)
Pull request description:
Currently, `TransactionWithinChainLimit` is restricted to single-output use, and needs to be called every time for different limits. If it is replaced with a chain limit value calculator, that can be called once and reused, and is generally more flexible (see e.g. #12257).
Update: this PR now corrects usage of max ancestors / max descendants, including calculating the correct max descendant value, as advertised for the two limits.
~~This change also makes `nMaxAncestors` signed, as the replacement method will return `-1` for "not in the mempool", which is different from "0", which means "no ancestors/descendants in mempool".~~
~~This is a subset of #12257.~~
Tree-SHA512: aa59c849360542362b3126c0e29d44d3d58f11898e277d38c034dc4b86a5b4500f77ac61767599ce878c876b5c446fec9c02699797eb2fa41e530ec863a00cf9
The chain limits check for max descendants would check the descendants of the transaction itself even though the description for -limitdescendantcount says 'any ancestor'. This commit corrects the descendant count check by finding the top parent transaction in the mempool and comparing against that.
TransactionWithinChainLimits would take a 'limit' and check it against ascendants and descendants. This is changed to take an explicit
max ancestors and max descendants value, and to test the corresponding value against its corresponding max.
b55555d rpc: Add testmempoolaccept (MarcoFalke)
Pull request description:
To check if a single raw transaction makes it into the current transaction pool, one had to call `sendrawtransaction`. However, on success, this adds the transaction to the mempool with no easy way to undo.
The call `testmempoolaccept` is introduced to provide a way to solely check the result without changing the mempool state.
Tree-SHA512: 5afd9311190135cee8fc1f229c7d39bf893f1028f29e28d34f70df820198ff97b4bf86b41cbbd6e6c36a5c30073cefa92d541c74a4939c7a2a6fa283dfd41b63
