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This is a synchronous callback notifying clients of all tip changes.
It allows clients to respond to a new block immediately after it is
connected. The synchronicity is important for things like
m_recent_rejects, in which a transaction's validity can change (rejected
vs accepted) when this event is processed. For example, the transaction
might have a timelock condition that has just been met. This is distinct
from something like m_recent_confirmed_transactions, in which the
validation outcome is the same (valid vs already-have), so it does not
need to be reset immediately.
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By defining a virtual interface class for the scheduler client, users of
the kernel can now define their own event consuming infrastructure,
without having to spawn threads or rely on the scheduler design.
Removing CScheduler also allows removing the thread and
exception modules from the kernel library.
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-BEGIN VERIFY SCRIPT-
s() { git grep -l "$1" src | xargs sed -i "s/$1/$2/g"; }
s 'CMainSignals' 'ValidationSignals'
s 'MainSignalsImpl' 'ValidationSignalsImpl'
-END VERIFY SCRIPT-
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To this end move some functions into the CMainSignals class.
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Create a new struct `NewMempoolTransactionInfo` that will be used as the new parameter of
`TransactionAddedToMempool` callback.
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This commit adds a new callback `MempoolTransactionsRemovedForBlock` which notify
its listeners of the transactions that are removed from the mempool because a new
block is connected, along with the block height the transactions were removed.
The transactions are in `RemovedMempoolTransactionInfo` format.
`CTransactionRef`, base fee, virtual size, and height which the transaction was added
to the mempool are all members of the struct called `RemovedMempoolTransactionInfo`.
A struct `NewMempoolTransactionInfo`, which has fields similar to `RemovedMempoolTransactionInfo`,
will be added in a later commit, create a struct `TransactionInfo` with all similar fields.
They can both have a member with type `TransactionInfo`.
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This allows consumers to decide how to handle events from background or
assumedvalid chainstates.
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This notification isn't needed for background chainstates.
`kernel::Notifications::blockTip` are also skipped.
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Co-authored-by: Anthony Towns <aj@erisian.com.au>
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
Commits of previous years:
- 2021: f47dda2c58b5d8d623e0e7ff4e74bc352dfa83d7
- 2020: fa0074e2d82928016a43ca408717154a1c70a4db
- 2019: aaaaad6ac95b402fe18d019d67897ced6b316ee0
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```
-BEGIN VERIFY SCRIPT-
s() { git grep -l "$1" src test doc | xargs sed -i "s/$1/$2/g"; }
s 'MainSignalsInstance' 'MainSignalsImpl'
-END VERIFY SCRIPT-
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and use Doxygen documentation for it, per our developer notes.
Context:
MainSignalsInstance was created in 3a19fed9db5 and originally was a struct
collection of boost::signals methods moved to validationinterface.cpp, in order
to no longer need to include boost/signals in validationinterface.h.
MainSignalsInstance then evolved in d6815a23131 to remove boost/signals2 and became class-like.
[C.8: Use class rather than struct if any member is
non-public](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-class)
[C.2: Use class if the class has an invariant; use struct if the data members can vary
independently](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c2-use-class-if-the-class-has-an-invariant-use-struct-if-the-data-members-can-vary-independently)
A class also has the advantage of default private access, as opposed to public for a struct.
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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.
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https://github.com/bitcoin/bitcoin/pull/18982#pullrequestreview-416974841
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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:
a31be09bfd77eed497a8e251d31358e16e2f2eb1 and
7e89994133725125dddbfa8d45484e3b9ed51c6e 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>
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Stop using boost::signals2 internally in validationinterface. Replace with
std::list and Add/Remove/Clear/Iterate helper functions.
Motivation for change is to reduce dependencies and avoid issues happening with
boost versions before 1.59:
https://github.com/bitcoin/bitcoin/issues/18517
https://github.com/bitcoin/bitcoin/pull/18471
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Currently it's possible for ReleaseWallet to delete the CWallet pointer while
it is processing BlockConnected, etc chain notifications.
To fix this, unregister from notifications earlier in UnloadWallet instead of
ReleaseWallet, and use a new RegisterSharedValidationInterface function to
prevent the CValidationInterface shared_ptr from being deleted until the last
notification is actually finished.
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The wallet now uses TransactionRemovedFromMempool to be notified about
conflicted wallet, and no other clients use vtxConflicted.
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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.
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
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-BEGIN VERIFY SCRIPT-
# Delete outdated alias for RecursiveMutex
sed -i -e '/CCriticalSection/d' ./src/sync.h
# Replace use of outdated alias with RecursiveMutex
sed -i -e 's/CCriticalSection/RecursiveMutex/g' $(git grep -l CCriticalSection)
-END VERIFY SCRIPT-
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
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This commit fires TransactionRemovedFromMempool callbacks from the
mempool and cleans up a bunch of code.
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To do so we update CValidationInterface::BlockDisconnect to take a
CBlockIndex pointing to the block being disconnected.
This new parameter will be use in the following commit to establish
wallet height.
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Split CValidationState into TxValidationState and BlockValidationState
to store validation results for transactions and blocks respectively.
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Removes the now-unused Broadcast/ResendWalletTransactions interface from
validationinterface.
The wallet_resendwallettransactions.py needs a sleep added at the start
to make sure that the rebroadcast scheduler is warmed up before the next
block is mined.
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Move nTimeBestReceived (which is only used for wallet
rebroadcasts) into the wallet.
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3fc20632a3ad30809356a58d2cf0ea4a4ad4cec3 qt: Set BLOCK_CHAIN_SIZE = 220 (DrahtBot)
2b6a2f4a28792f2fe9dc1be843b1ff1ecae35e8a Regenerate manpages (DrahtBot)
eb7daf4d600eeb631427c018a984a77a34aca66e 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
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memory model
cbeaa91dbb Update ValidationInterface() documentation to explicitly specify threading and memory model (Jesse Cohen)
b296b425a7 Update documentation for SingleThreadedSchedulerClient() to specify the memory model (Jesse Cohen)
9994d01d8b Add Unit Test for SingleThreadedSchedulerClient (Jesse Cohen)
Pull request description:
As discussed in #13023 I've split this test out into a separate pr
This test (and documentation update) makes explicit the guarantee (previously undefined, but implied by the 'SingleThreaded' in `SingleThreadedSchedulerClient()`) - that callbacks pushed to the `SingleThreadedSchedulerClient()` obey the single threaded model for memory and execution - specifically, the callbacks are executed fully and in order, and even in cases where a subsequent callback is executed by a different thread, sequential consistency of memory for all threads executing these callbacks is maintained.
Maintaining memory consistency should make the api more developer friendly - especially for users of the validationinterface. To the extent that there are performance implications from this decision, these are not currently present in practice because all use of this scheduler happens on a single thread currently, furthermore the lock should guarantee consistency across callback executions even when callbacks are executed by multiple threads (as the test does).
Tree-SHA512: 5d95a7682c402e5ad76b05bc9dfbca99ca64105f62ab9e78f6fc0f6ea8c5277aa399fbb94298e35cc677b0c2181ff17259584bb7ae230e38aa68b85ecbc22856
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and memory model
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I thought we had removed this a long time ago, TBH, its really
confusing feedback to users that we display whether a tx was
broadcast to immediate neighbor nodes, given that has little
indication of whether the tx propagated very far.
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dd435ad Add unit tests for signals generated by ProcessNewBlock() (Jesse Cohen)
a3ae8e6 Fix concurrency-related bugs in ActivateBestChain (Jesse Cohen)
ecc3c4a Do not unlock cs_main in ABC unless we've actually made progress. (Matt Corallo)
Pull request description:
Originally this PR was just to add tests around concurrency in block validation - those tests seem to have uncovered another bug in ActivateBestChain - this now fixes that bug and adds tests.
ActivateBestChain (invoked after a new block is validated) proceeds in steps - acquiring and releasing cs_main while incrementally disconnecting and connecting blocks to sync to the most work chain known (FindMostWorkChain()). Every time cs_main is released the result of FindMostWorkChain() can change - but currently that value is cached across acquisitions of cs_main and only refreshed when an invalid chain is explored. It needs to be refreshed every time cs_main is reacquired. The test added in https://github.com/bitcoin/bitcoin/pull/13023/commits/6094ce73045fe0b4654ff94327c2059512af88fb will occasionally fail without the commit fixing this issue https://github.com/bitcoin/bitcoin/pull/13023/commits/26bfdbaddbb9f13864deb7241c6d513f22c5ab62
Original description below
--
After a bug discovered where UpdatedBlockTip() notifications could be triggered out of order (#12978), these unit tests check certain invariants about these signals.
The scheduler test asserts that a SingleThreadedSchedulerClient processes callbacks fully and sequentially.
The block validation test generates a random chain and calls ProcessNewBlock from multiple threads at random and in parallel. ValidationInterface callbacks verify that the ordering of BlockConnected BlockDisconnected and UpdatedBlockTip events occur as expected.
Tree-SHA512: 4102423a03d2ea28580c7a70add8a6bdb22ef9e33b107c3aadef80d5af02644cdfaae516c44933924717599c81701e0b96fbf9cf38696e9e41372401a5ee1f3c
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Technically, some internal datastructures may be in an inconsistent
state if we do this, though there are no known bugs there. Still,
for future safety, its much better to only unlock cs_main if we've
made progress (not just tried a reorg which may make progress).
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Previously, ChainStateFlushed would fire either if a full flush
completed (which can happen due to memory limits, forced flush, or
on its own DATABASE_WRITE_INTERVAL timer) *or* on a
ChainStateFlushed-specific DATABASE_WRITE_INTERVAL timer. This is
both less clear for clients (as there are no guarantees about a
flush having actually happened prior to the call), and reults in
extra flushes not clearly intended by the code. We drop the second
case, providing a strong guarantee without removing the periodit
timer-based flushing.
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This much more accurately captures the meaning of the callback.
-BEGIN VERIFY SCRIPT-
sed -i 's/SetBestChain/ChainStateFlushed/g' src/validationinterface.h src/validationinterface.cpp src/wallet/wallet.h src/wallet/wallet.cpp src/validation.cpp src/index/txindex.h src/index/txindex.cpp
-END VERIFY SCRIPT-
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* Make PeerLogicValidation final to prevent deriving from it [1]
* Prevent deletions of NetEventsInterface and CValidationInterface
objects via a base class pointer
[1] silences the following compiler warning (from Clang 7.0.0):
/usr/include/c++/v1/memory:2285:5: error: delete called on non-final 'PeerLogicValidation' that has
virtual functions but non-virtual destructor [-Werror,-Wdelete-non-virtual-dtor]
delete __ptr;
^
/usr/include/c++/v1/memory:2598:7: note: in instantiation of member function
'std::__1::default_delete<PeerLogicValidation>::operator()' requested here
__ptr_.second()(__tmp);
^
init.cpp:201:15: note: in instantiation of member function 'std::__1::unique_ptr<PeerLogicValidation,
std::__1::default_delete<PeerLogicValidation> >::reset' requested here
peerLogic.reset();
^
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