Comments are expanded.
Return BlockValidationState instead of passing a reference.
Lock Chainman mutex instead of cs_main.
Remove redundant chainparams and pindexPrev arguments.
Drop defaults for checking proof-of-work and merkle root.
The ContextualCheckBlockHeader check is moved to after CheckBlock,
which is more similar to normal validation where context-free checks
are done first.
Validation failure reasons are no longer printed through LogError(),
since it depends on the caller whether this implies an actual bug
in the node, or an externally sourced block that happens to be invalid.
When called from getblocktemplate, via BlockAssembler::CreateNewBlock(),
this method already throws an std::runtime_error if validation fails.
Additionally it moves the inconclusive-not-best-prevblk check from RPC
code to TestBlockValidity.
There is no behavior change when callling getblocktemplate with proposal.
Previously this would return a BIP22ValidationResult which can throw for
state.IsError(). But CheckBlock() and the functions it calls only use
state.IsValid().
The final assert is changed into Assume, with a LogError.
Co-authored-by: <Ryan Ofsky <ryan@ofsky.org>
62fc42d475 interfaces: refactor: move `waitTipChanged` implementation to miner (ismaelsadeeq)
c39ca9d4f7 interfaces: move getTip implementation to miner (Sjors Provoost)
720f201e65 interfaces: refactor: move `waitNext` implementation to miner (ismaelsadeeq)
e6c2f4ce7a interfaces: refactor: move `submitSolution` implementation to miner (ismaelsadeeq)
02d4bc776b interfaces: remove redundant coinbase fee check in `waitNext` (ismaelsadeeq)
Pull request description:
#### Motivation
In [Internal interface guidelines](https://github.com/bitcoin/bitcoin/blob/master/doc/developer-notes.md#internal-interface-guidelines)
It's stated that
> Interface method definitions should wrap existing functionality instead of implementing new functionality. Any substantial new node or wallet functionality should be implemented in [src/node/](https://github.com/bitcoin/bitcoin/blob/master/src/node) or [src/wallet/](https://github.com/bitcoin/bitcoin/blob/master/src/wallet) and just exposed in [src/interfaces/](https://github.com/bitcoin/bitcoin/blob/master/src/interfaces) instead of being implemented there, so it can be more modular and accessible to unit tests.
However the some methods in the newly added `BlockTemplateImpl` and `MinerImpl` classes partially enforces this guideline, as the implementations of the `submitSolution`, `waitNext`, and `waitTipChanged` methods reside within the class itself.
#### What the PR Does
This PR introduces a simple refactor by moving certain method implementations from `BlockTemplateImpl` into the miner module. It introduces three new functions:
1. Remove rundundant coinbase fee check in `waitNext`
2. **`AddMerkleRootAndCoinbase`**: Computes the block's Merkle root, inserts the coinbase transaction, and sets the Merkle root in the block. This function is called by `submitSolution` before the block is submitted for processing.
3. **`WaitAndCreateNewBlock`**: Returns a new block template either when transaction fees reach a certain threshold or when a new tip is detected. If a timeout is reached, it returns `nullptr`. The `waitNext` method in `BlockTemplateImpl` now simply wraps this function.
4. Move `GetTip` implementation to miner.
5. **`WaitTipChanged`**: Returns the tip when the chain it changes, or `nullopt` if a timeout or interrupt occurs. The `waitTipChanged` method in `MinerImpl` now calls `GetTip` after invoking `ChainTipChanged`, and returns the tip.
#### Behavior Change
- We now only `Assert` for a valid chainman and notifications pointer once.
ACKs for top commit:
achow101:
ACK 62fc42d475
Sjors:
ACK 62fc42d475
ryanofsky:
Code review ACK 62fc42d475. Lots of suggest suggest changes made since last review, altering function names and signatures and also adding new commit to drop negative fee handling. I like the idea of making the wait function return a BlockRef, that is clearer than what I suggested. Left some comments below but they are not important and this looks good as-is
Tree-SHA512: 502632f94ced81f576b2c43cf015f1527e2c259e6ca253f670f5a6889171e2246372b4e709575701afa3f01d488d6633557fef54f48fe83bbaf1836ac5326c4f
- This commit creates a function `WaitTipChanged` that waits for the connected
tip to change until timeout elapsed.
- This function is now used by `waitTipChanged`
Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
- Create a new function `AddMerkleRootAndCoinbase` that compute the
block's merkle root, insert the coinbase transaction and the merkle
root into the block.
a58cb3b1c1 qa: sanity check mined block have their coinbase timelocked to height (Antoine Poinsot)
8f2078af6a miner: timelock coinbase transactions (Antoine Poinsot)
788aeebf34 qa: use prev height as nLockTime for coinbase txs created in unit tests (Antoine Poinsot)
c76dbe9b8b qa: timelock coinbase transactions created in fuzz targets (Antoine Poinsot)
9c94069d8b contrib: timelock coinbase transactions in signet miner (Antoine Poinsot)
a5f52cfcc4 qa: timelock coinbase transactions created in functional tests (Antoine Poinsot)
Pull request description:
The Consensus Cleanup soft fork proposal includes enforcing that coinbase transactions set their
nLockTime field to the block height minus 1, as well as their nSequence such as to not disable the
timelock. If such a fork were to be activated by Bitcoin users, miners need to be ready to produce
compliant blocks at the risk of losing substantial amounts mining would-be invalid blocks. As miners
are unfamously slow to upgrade, it's good to make this change as early as possible.
Although Bitcoin Core's GBT implementation does not provide the `coinbasetxn` field, and mining
pool software crafts the coinbase on its own, updating the Bitcoin Core mining code is a first step
toward convincing pools to update their (often closed source) code. A possible followup is also to
introduce new fields to GBT. In addition, this first step also makes it possible to test future
Consensus Cleanup changes.
The commit making the change also updates a bunch of seemingly-unrelated tests. This is because those tests were asserting error messages based on the txid of transactions involved, and changing the coinbase transaction structure necessarily changes the txid of all tests' transactions.
ACKs for top commit:
Sjors:
Code review ACK a58cb3b1c1
achow101:
ACK a58cb3b1c1
TheCharlatan:
Re-ACK a58cb3b1c1
Tree-SHA512: a2aae009a187eb760d34435f518a895ee76c6b02a667eb030ddf6bd584da6e8eae2737d974dbf81a928d60c07bcb4820f055adc067e18d8819640db0240bb513
524f981bb8 Bugfix: Miner: Don't reuse block_reserved_weight for "block is full enough to give up" weight delta (Luke Dashjr)
Pull request description:
PR #30356 incorrectly changed a constant of `4000` to `m_options.coinbase_max_additional_weight` in the check for when to give up finding another transaction to fill the block:
```diff
if (nConsecutiveFailed > MAX_CONSECUTIVE_FAILURES && nBlockWeight >
- m_options.nBlockMaxWeight - 4000) {
+ m_options.nBlockMaxWeight - m_options.block_reserved_weight) {
// Give up if we're close to full and haven't succeeded in a while
break;
}
```
But this constant did not deal with the reserved weight at all. It was in fact simply checking if the block was close to full, and if so, giving up finding another transaction to pad it with after `MAX_CONSECUTIVE_FAILURES` failed attempts.
It doesn't seem very logical to reuse the reserve weight for this purpose, and it would be overcomplicated to add yet another setting, so this PR changes it to a new constexpr.
ACKs for top commit:
achow101:
ACK 524f981bb8
darosior:
utACK 524f981bb8
ismaelsadeeq:
ACK 524f981bb8
Tree-SHA512: c066debc34a021380424bd21b40444071b736325e41779a41590c2c8a6822ceeaf910fe067817c1dba108210b24c574977b0350b29520502e7af79d3b405928b
PR #30356 incorrectly changed a constant of `4000` to `m_options.coinbase_max_additional_weight` in the check for when to give up finding another transaction to fill the block:
```diff
if (nConsecutiveFailed > MAX_CONSECUTIVE_FAILURES && nBlockWeight >
- m_options.nBlockMaxWeight - 4000) {
+ m_options.nBlockMaxWeight - m_options.block_reserved_weight) {
// Give up if we're close to full and haven't succeeded in a while
break;
}
```
But this constant did not deal with the reserved weight at all. It was in fact simply checking if the block was close to full, and if so, giving up finding another transaction to pad it with after `MAX_CONSECUTIVE_FAILURES` failed attempts.
It doesn't seem very logical to reuse the reserve weight for this purpose, and it would be overcomplicated to add yet another setting, so this PR changes it to a new constexpr.
The Consensus Cleanup soft fork proposal includes enforcing that coinbase transactions set their
locktime field to the block height, minus 1 (as well as their nSequence such as to not disable the
timelock). If such a fork were to be activated by Bitcoin users, miners need to be ready to produce
compliant blocks at the risk of losing substantial amounts mining would-be invalid blocks. As miners
are unfamously slow to upgrade, it's good to make this change as early as possible.
Although Bitcoin Core's GBT implementation does not provide the "coinbasetxn" field, and mining
pool software crafts the coinbase on its own, updating the Bitcoin Core mining code is a first step
toward convincing pools to update their (often closed source) code. A possible followup is also to
introduce new fields to GBT. In addition, this first step also makes it possible to test future
Consensus Cleanup changes.
The changes to the seemingly-unrelated RBF tests is because these tests assert an error message
which may vary depending on the txid of the transactions used in the test. This commit changes the
coinbase transaction structure and therefore impact the txid of transactions in all tests.
The change to the "Bad snapshot" error message in the assumeutxo functional test is because this
specific test case reads into the txid of the next transaction in the snapshot and asserts the error
message based it gets on deserializing this txid as a coin for the previous transaction. As this
commit changes this txid it impacts the deserialization error raised.
For the coinbase vTxFees used a dummy value of -nFees. This
value was never returned by the RPC or used in a test.
Similarly the fist vTxSigOpsCost entry was calculated from
the dummy coinbase transaction.
Drop both and add code comments to prevent confusion.
386eecff5f doc: add release notes (ismaelsadeeq)
3eaa0a3b66 miner: init: add `-blockreservedweight` startup option (ismaelsadeeq)
777434a2cd doc: rpc: improve `getmininginfo` help text (ismaelsadeeq)
c8acd4032d init: fail to start when `-blockmaxweight` exceeds `MAX_BLOCK_WEIGHT` (ismaelsadeeq)
5bb31633cc test: add `-blockmaxweight` startup option functional test (ismaelsadeeq)
2c7d90a6d6 miner: bugfix: fix duplicate weight reservation in block assembler (ismaelsadeeq)
Pull request description:
* This PR attempts to fix the duplicate coinbase weight reservation issue we currently have.
* Fixes#21950
We reserve 4000 weight units for coinbase transaction in `DEFAULT_BLOCK_MAX_WEIGHT`
7590e93bc7/src/policy/policy.h (L23)
And also reserve additional `4000` weight units in the default `BlockCreationOptions` struct.
7590e93bc7/src/node/types.h (L36-L40)
**Motivation**
- This issue was first noticed during a review here https://github.com/bitcoin/bitcoin/pull/11100#discussion_r136157411)
- It was later reported in issue #21950.
- I also came across the bug while writing a test for building the block template. I could not create a block template above `3,992,000` in the block assembler, and this was not documented anywhere. It took me a while to realize that we were reserving space for the coinbase transaction weight twice.
---
This PR fixes this by consolidating the reservation to be in a single location in the codebase.
This PR then adds a new startup option `-blockreservedweight` whose default is `8000` that can be used to lower or increase the block reserved weight for block header, txs count, coinbase tx.
ACKs for top commit:
Sjors:
ACK 386eecff5f
fjahr:
Code review ACK 386eecff5f
glozow:
utACK 386eecff5f, nonblocking nits. I do think the release notes should be clarified more
pinheadmz:
ACK 386eecff5f
Tree-SHA512: f27efa1da57947b7f4d42b9322b83d13afe73dd749dd9cac49360002824dd41c99a876a610554ac2d67bad7485020b9dcc423a8e6748fc79d6a10de6d4357d4c
- This commit renamed coinbase_max_additional_weight to block_reserved_weight.
- Also clarify that the reservation is for block header, transaction count
and coinbase transaction.
Before bip94 there was an assumption that the minimum permitted
timestamp is GetMedianTimePast() + 1.
This commit splits a helper function out of UpdateTime() to
obtain the minimum time in a way that takes the
timewarp attack rule into account.
733fa0b0a1 miner: never create a template which exploits the timewarp bug (Antoine Poinsot)
Pull request description:
This check was introduced in #30681 but only enabled for testnet4. To avoid potentially creating an invalid block template if a soft fork to fix the timewarp attack were to activate in the future, we should have this check on all networks. It also seems wise for our miner to not support it whether or not a soft fork activates to fix it at the consensus level.
ACKs for top commit:
Sjors:
ACK 733fa0b0a1
fjahr:
utACK 733fa0b0a1
TheCharlatan:
ACK 733fa0b0a1
Tree-SHA512: 9b3bc8b26a57f93425b17dda80bcfac4ecb750a3d26bc3eb8df619135634e369ac15982fac0c9770b1df207bd2e418ffe02a98f37968f024e55262d97715a4f5
- The package feerates are ordered by the sequence in which
packages are selected for inclusion in the block template.
- The commit also tests this new behaviour.
Co-authored-by: willcl-ark <will@256k1.dev>
Providing a script for the coinbase transaction is only done in test code
and for CPU solo mining.
Production miners use the getblocktemplate RPC which omits the coinbase
transaction entirely from its block template, leaving it to external (pool)
software to construct it.
A coinbase script can still be passed via BlockCreateOptions instead.
A temporary overload is added so that the test can be modified in the
next commit.
192dac1d33 [refactor] Cleanup BlockAssembler mempool usage (TheCharlatan)
Pull request description:
The `addPackageTxs` method of the `BlockAssembler` currently has access to two mempool variables, as an argument and as a member. Clean this up and clarify that they both are the same mempool instance by removing the argument and instead only using the member variable in the method.
This was noticed in this PR review: https://github.com/bitcoin/bitcoin/pull/25223#discussion_r898164322.
ACKs for top commit:
achow101:
ACK 192dac1d33
danielabrozzoni:
re-ACK 192dac1
stickies-v:
ACK 192dac1d33
Tree-SHA512: a5ae7d6d771fbb5b54f23624b4d3429acf07bbe38179a462a078c825d60c89a725ad4e13fe7067eebea7dfec63c56c8f39b5077b0d949d594f500affcc1272d1
The `addPackageTxs` method of the `BlockAssembler` currently has access
to two mempool variables, as an argument and as a member. Clean this up
and clarify that they both are the same mempool instance by removing the
argument and instead only using the member variable in the method.
Co-Authored-By: Anthony Towns <aj@erisian.com.au>
Co-authored-by: stickies-v <stickies-v@protonmail.com>
When generating a block template through e.g. getblocktemplate RPC,
we reserve 4000 weight units and 400 sigops. Pools use this space
for their coinbase outputs.
At least one pool patched their Bitcoin Core node to adjust
these hardcoded values. They eventually produced an invalid
block which exceeded the sigops limit.
https://bitcoin.stackexchange.com/questions/117837/how-many-sigops-are-in-the-invalid-block-783426
The existince of such patches suggests it may be useful to
make this value configurable. This commit would make such a
change easier.
The main motivation however is that the Stratum v2 spec
requires the pool to communicate the maximum bytes they intend
to add to the coinbase outputs. A proposed change to the spec
would also require them to communicate the maximum number of sigops.
This commit also documents what happens when
-blockmaxweight is lower than the coinbase
reserved value.
Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
Rather than pass options individually to createNewBlock and then
combining them into BlockAssembler::Options, this commit introduces
BlockCreateOptions and passes that instead.
Currently there's only one option (use_mempool) but the next
commit adds more.
Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
AddToBlock was called repeatedly from `addPackageTxs` where the constant value of `printpriority` is recalculated every time.
Since its behavior was changed in 400b151, I've named the variable accordingly.
This showed up during profiling of AssembleBlock, fetching it once in the constructor results in a measurable speed increase for many iterations.
> ./src/bench/bench_bitcoin --filter='AssembleBlock' --min-time=1000
before:
| ns/op | op/s | err% | total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
| 155,558.97 | 6,428.43 | 0.1% | 1.10 | `AssembleBlock`
after:
| ns/op | op/s | err% | total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
| 148,083.68 | 6,752.94 | 0.1% | 1.10 | `AssembleBlock`
Co-authored-by: furszy <mfurszy@protonmail.com>
This makes the options argument for BlockAssembler constructor mandatory,
dropping implicit use of ArgsManager. The caller i.e. the Mining
interface implementation now handles this.
In a future Stratum v2 change the Options object needs to be
mofified after arguments have been processed. Specifically
the pool communicates how many extra bytes it needs for
its own outputs (payouts, extra commitments, etc). This will need
to be substracted from what the user set as -blockmaxweight.
Such a change can be implemented in createNewBlock, after
ApplyArgsManOptions.
This is an extraction of ArgsManager related functions from util/system
into their own common file.
Config file related functions are moved to common/config.cpp.
The background of this commit is an ongoing effort to decouple the
libbitcoinkernel library from the ArgsManager. The ArgsManager belongs
into the common library, since the kernel library should not depend on
it. See doc/design/libraries.md for more information on this rationale.
ApplyArgsManOptions does not need to set default values for missing
arguments, these are already defined in the BlockAssembler::Options.
This commit changes the interface of ApplyArgsManOptions(). If
ApplyArgsManOptions() is called again after a option is changed,
this option will no longer be reset to the default value.
There is no observed behaviour change due to how
ApplyArgsManOptions() is currently used, and the new interface is
consistent with e.g. ValidationCacheSizes and MemPoolLimits.
Add Options as a member to BlockAssembler to avoid having to assign
all the options individually.
Additionally brings the struct more in line with how we typically
define default and ArgManager values, as e.g. with
ChainstateManager::Options and and CTxMemPool::Options
04528054fc [bench] BlockAssembler with mempool packages (glozow)
6ce265acf4 [test util] lock cs_main before pool.cs in PopulateMempool (glozow)
8791410662 [test util] randomize fee in PopulateMempool (glozow)
cba5934eb6 [miner] allow bypassing TestBlockValidity (glozow)
c058852308 [refactor] parameterize BlockAssembler::Options in PrepareBlock (glozow)
a2de971ba1 [refactor] add helper to apply ArgsManager to BlockAssembler::Options (glozow)
Pull request description:
Performance of block template building matters as miners likely want to be able to start mining on a block with transactions asap after a block is found. We would want to know if a mempool PR accidentally caused, for example, a 100x slowdown. An `AssembleBlock()` bench exists, but it operates on a mempool with 101 transactions, each with 0 ancestors or descendants and with the same fee. Adding a bench with a more complex mempool is useful because (1) it's more realistic (2) updating packages can potentially cause the algorithm to take a long time.
ACKs for top commit:
kevkevinpal:
Tested ACK [0452805](04528054fc)
achow101:
ACK 04528054fc
stickies-v:
ACK 04528054f
Tree-SHA512: 38c138d6a75616651f9b1faf4e3a1cd833437a486f4e84308fbee958e8462bb570582c88f7ba7ab99d80191e97855ac2cf27c43cc21585d3e4b0e227effe2fb5
47c4b1f52a mempool: log/halt when CalculateMemPoolAncestors fails unexpectedly (stickies-v)
5481f65849 mempool: add AssumeCalculateMemPoolAncestors helper function (stickies-v)
f911bdfff9 mempool: use util::Result for CalculateMemPoolAncestors (stickies-v)
66e028f739 mempool: use util::Result for CalculateAncestorsAndCheckLimits (stickies-v)
Pull request description:
Upon reviewing the documentation for `CTxMemPool::CalculateMemPoolAncestors`, I noticed `setAncestors` was meant to be an `out` parameter but actually is an `in,out` parameter, as can be observed by adding `assert(setAncestors.empty());` as the first line in the function and running `make check`. This PR fixes this unexpected behaviour and introduces refactoring improvements to make intents and effects of the code more clear.
## Unexpected behaviour
This behaviour occurs only in the package acceptance path, currently only triggered by `testmempoolaccept` and `submitpackage` RPCs.
In `MemPoolAccept::AcceptMultipleTransactions()`, we first call `PreChecks()` and then `SubmitPackage()` with the same `Workspace ws` reference. `PreChecks` leaves `ws.m_ancestors` in a potentially non-empty state, before it is passed on to `MemPoolAccept::SubmitPackage`. `SubmitPackage` is the only place where `setAncestors` isn't guaranteed to be empty before calling `CalculateMemPoolAncestors`. The most straightforward fix is to just forcefully clear `setAncestors` at the beginning of CalculateMemPoolAncestors, which is done in the first bugfix commit.
## Improvements
### Return value instead of out-parameters
This PR updates the function signatures for `CTxMemPool::CalculateMemPoolAncestors` and `CTxMemPool::CalculateAncestorsAndCheckLimits` to use a `util::Result` return type and eliminate both the `setAncestors` `in,out`-parameter as well as the error string. It simplifies the code and makes the intent and effects more explicit.
### Observability
There are 7 instances where we currently call `CalculateMemPoolAncestors` without actually checking if the function succeeded because we assume that it can't fail, such as in [miner.cpp](69b10212ea/src/node/miner.cpp (L399)). This PR adds a new wrapper `AssumeCalculateMemPoolAncestors` function that logs such unexpected failures, or in case of debug builds even halts the program. It's not crucial to the objective, more of an observability improvement that seems sensible to add on here.
ACKs for top commit:
achow101:
ACK 47c4b1f52a
w0xlt:
ACK 47c4b1f52a
glozow:
ACK 47c4b1f52a
furszy:
light code review ACK 47c4b1f5
aureleoules:
ACK 47c4b1f52a
Tree-SHA512: d908dad00d1a5645eb865c4877cc0bae74b9cd3332a3641eb4a285431aef119f9fc78172d38b55c592168a73dae83242e6af3348815f7b37cbe2d448a3a58648
Allows us to test BlockAssembler on transactions without signatures or
mature coinbases (which is what PopulateMempool creates). Also means
that `TestBlockValidity()` is not included in the bench timing.
This allows us to both manually manipulate options and grab values from
ArgsManager (i.e. -blockmaxweight and -blockmintxfee config options)
when constructing BlockAssembler::Options. Prior to this change, the
only way to apply the config options is by ctoring BlockAssembler with
no options, which calls DefaultOptions().
When CalculateMemPoolAncestors fails unexpectedly (e.g. it exceeds
ancestor/descendant limits even though we expect no limits to be applied),
add an error log entry for increased visibility. For debug builds,
the application will even halt completely since this is not supposed
to happen.
fabf1cdb20 Use steady clock for bench logging (MacroFake)
faed342a23 scripted-diff: Rename time symbols (MacroFake)
Pull request description:
Instead of using `0.001` and similar constants to "convert" an int64_t to milliseconds, use the type-safe `Ticks<>` helper. Also, use steady clock instead of system clock, since the durations are used for benchmarking.
ACKs for top commit:
fanquake:
ACK fabf1cdb20 - validation bench output still looks sane.
Tree-SHA512: e6525b5fdad6045ca500c56014897d7428ad288aaf375933d3b5939feddf257f6910d562eb66ebcde9186bef9a604ee8d763a318253838318d59df2a285be7c2
33b12e5df6 docs: improve docs where MemPoolLimits is used (stickies-v)
6945853c0b test: use NoLimits() in MempoolIndexingTest (stickies-v)
3a86f24a4c refactor: mempool: use CTxMempool::Limits (stickies-v)
b85af25f87 refactor: mempool: add MemPoolLimits::NoLimits() (stickies-v)
Pull request description:
Mempool currently considers 4 limits regarding ancestor and descendant count and size, which get passed around between functions quite a bit. This PR uses `CTxMemPool::Limits` introduced in https://github.com/bitcoin/bitcoin/pull/25290 to simplify those signatures and callsites.
The purpose of this PR is to improve readability and maintenance, without behaviour change.
As noted in the first commit "refactor: mempool: change MemPoolLimits members to uint", we currently have an underflow issue where a user could pass a negative `-limitancestorsize`, which is eventually cast to an unsigned integer. This behaviour already exists. Because it's orthogonal and to minimize scope, I think this should be fixed in a separate PR.
ACKs for top commit:
hebasto:
ACK 33b12e5df6, I have reviewed the code and it looks OK, I agree it can be merged.
glozow:
reACK 33b12e5df6
Tree-SHA512: 591c6dcee1894f1c3ca28b34a680eeadcf0d40cda92451b4a422c03087b27d682b5e30ba4367abd75a99b5ccb115b7884b0026958d3c7dddab030549db5a4056
0f40d65321 refactor: remove duplicate code from BlockAssembler (James O'Beirne)
Pull request description:
Found while reminding myself how transactions are chosen for blocks. Take it or leave it!
ACKs for top commit:
glozow:
ACK 0f40d65321
theStack:
Concept and code-review ACK 0f40d65321
Tree-SHA512: 8a2694e670ce3fe897ab8f64f64c8df5f8487fc1264527a3abbcba0e5b921fb693416497ccd62508295bc33f202c65556b91b6af463acb91aab43138d2492c14
Simplifies function signatures by removing repetition of all the
ancestor/descendant limits, and increases readability by being
more verbose by naming the limits, while still reducing the LoC.
