Currently if the version 3 is selected for an otherwise
standard spender, the test will fail. It's unlikely but
possible, so change the test to update expectations and
sample more aggressively on border values to instigate
failures much quicker in the future if another version is
made standard.
Since #29412, we have not allowed mutated blocks to continue
being processed immediately the block is received, but this
is only done for the legacy BLOCK message.
Extend these checks as belt-and-suspenders to not allow
similar mutation strategies to affect relay by honest peers
by applying the check inside
PartiallyDownloadedBlock::FillBlock, immediately before
returning READ_STATUS_OK.
This also removes the extraneous CheckBlock call.
Datacarrier output script sizes and output counts are now
uncapped by default.
To avoid introducing another startup argument, we modify the
OP_RETURN accounting to "budget" the spk sizes.
If a user has set a custom default, this results in that
budget being spent over the sum of all OP_RETURN outputs'
scripts in the transaction, no longer capping the number
of OP_RETURN outputs themselves. This should allow a
superset of current behavior while respecting the passed
argument in terms of total arbitrary data storage.
Co-authored-by: Anthony Towns <aj@erisian.com.au>
The current test directly uses invalidatblock to trigger
mempool re-entry of transactions. Unfortunately, the
behavior doesn't match what a real reorg would look like. As
a result you get surprising behavior such as the mempool
descendant chain limits being exceeded, or if a fork is
greater than 10 blocks deep, evicted block transactions stop
being submitted back into in the mempool.
Fix this by preparing an empty fork chain, and then
continuing with the logic, finally submitting the fork chain
once the rest of the test is prepared. This triggers a more
typical codepath.
Also, extend the descendant limit to 100, like ancestor
limit.
1. Check that outbound nodes are treated
the same as whitelisted connections for
the purposes of getdata delays
2. Add test case that demonstrates
download retries are preferentially
given to outbound (preferred) connections
even when multiple announcements are
considered ready.
This tests the new submitblock behaviour that is introduced in the
previous commit: Submitting a previously pruned block should persist the
block's data again.
Also known as Ephemeral Dust.
We try to ensure that dust is spent in blocks by requiring:
- ephemeral dust tx is 0-fee
- ephemeral dust tx only has one dust output
- If the ephemeral dust transaction has a child,
the dust is spent by by that child.
0-fee requirement means there is no incentive to mine
a transaction which doesn't have a child bringing its
own fees for the transaction package.
Current test coverage doesn't ensure that mempool trimming
doesn't appear prior to the entire package, and not just
the subpackage, is finished being submitted.
Add a scenario that covers this case, where package
ancestors can make it in individually, but would be
immadiately evicted if not for the package CPFP.
These outputs are called anchors, and allow
key-less anchor spends which are vsize-minimized
versus keyed anchors which require larger outputs
when creating and inputs when spending.
The fuzz target is generating a large amount of
transactions, but the core of the logic is
ConsumeTxMemPoolEntry making the mempool
entries for adding to the mempool. Since
ConsumeTxMemPoolEntry generates its own transaction
"vsize", we can improve efficiency of the target
by explicitly creating very small transactions,
reducing the hashing and memory burden.
Relax assumptions about in-mempool children of in-mempool
parents. With package RBF, we will allow a package of size
2 with conflicts on its parent and reconsider the parent
if its fee is insufficient on its own.
Consider:
TxA (in mempool) <- TxB (in mempool)
TxA (in mempool) <- TxB' (in package, conflicts with TxB) <-
TxC (in package)
If TxB' fails to RBF TxB due to insufficient feerate, the
package TxB' + TxC will be considered. PackageV3Checks
called on TxB' will see an in-mempool parent TxA, and
see the in-mempool child TxB. We cannot assume there is
no in-mempool sibling, rather detect it and fail normally.
Prior to package RBF, this would have failed on the first
conflict in package.
We want to ensure that even if topologies
that are acceptable are relaxed, like
removing package-not-child-with-unconfirmed-parents,
that we don't end up accepting packages we shouldn't.
Greg Sanders