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Merge pull request #4554 from mempool/mononaut/unmineable-txs

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Handle unmineable transactions in GBT implementations
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softsimon 2024-01-10 00:18:41 +07:00 committed by GitHub
commit aad288c0d9
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5 changed files with 98 additions and 74 deletions
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3
backend/rust-gbt/index.d.ts vendored
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@ -45,5 +45,6 @@ export class GbtResult {
blockWeights: Array<number>
clusters: Array<Array<number>>
rates: Array<Array<number>>
constructor(blocks: Array<Array<number>>, blockWeights: Array<number>, clusters: Array<Array<number>>, rates: Array<Array<number>>)
overflow: Array<number>
constructor(blocks: Array<Array<number>>, blockWeights: Array<number>, clusters: Array<Array<number>>, rates: Array<Array<number>>, overflow: Array<number>)
}

139
backend/rust-gbt/src/gbt.rs
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@ -60,6 +60,7 @@ pub fn gbt(mempool: &mut ThreadTransactionsMap, accelerations: &[ThreadAccelerat
indexed_accelerations[acceleration.uid as usize] = Some(acceleration);
}
info!("Initializing working vecs with uid capacity for {}", max_uid + 1);
let mempool_len = mempool.len();
let mut audit_pool: AuditPool = Vec::with_capacity(max_uid + 1);
audit_pool.resize(max_uid + 1, None);
@ -127,74 +128,75 @@ pub fn gbt(mempool: &mut ThreadTransactionsMap, accelerations: &[ThreadAccelerat
let next_from_stack = next_valid_from_stack(&mut mempool_stack, &audit_pool);
let next_from_queue = next_valid_from_queue(&mut modified, &audit_pool);
if next_from_stack.is_none() && next_from_queue.is_none() {
continue;
}
let (next_tx, from_stack) = match (next_from_stack, next_from_queue) {
(Some(stack_tx), Some(queue_tx)) => match queue_tx.cmp(stack_tx) {
std::cmp::Ordering::Less => (stack_tx, true),
_ => (queue_tx, false),
},
(Some(stack_tx), None) => (stack_tx, true),
(None, Some(queue_tx)) => (queue_tx, false),
(None, None) => unreachable!(),
};
if from_stack {
mempool_stack.pop();
info!("No transactions left! {:#?} in overflow", overflow.len());
} else {
modified.pop();
}
let (next_tx, from_stack) = match (next_from_stack, next_from_queue) {
(Some(stack_tx), Some(queue_tx)) => match queue_tx.cmp(stack_tx) {
std::cmp::Ordering::Less => (stack_tx, true),
_ => (queue_tx, false),
},
(Some(stack_tx), None) => (stack_tx, true),
(None, Some(queue_tx)) => (queue_tx, false),
(None, None) => unreachable!(),
};
if blocks.len() < (MAX_BLOCKS - 1)
&& ((block_weight + (4 * next_tx.ancestor_sigop_adjusted_vsize())
>= MAX_BLOCK_WEIGHT_UNITS)
|| (block_sigops + next_tx.ancestor_sigops() > BLOCK_SIGOPS))
{
// hold this package in an overflow list while we check for smaller options
overflow.push(next_tx.uid);
failures += 1;
} else {
let mut package: Vec<(u32, u32, usize)> = Vec::new();
let mut cluster: Vec<u32> = Vec::new();
let is_cluster: bool = !next_tx.ancestors.is_empty();
for ancestor_id in &next_tx.ancestors {
if let Some(Some(ancestor)) = audit_pool.get(*ancestor_id as usize) {
package.push((*ancestor_id, ancestor.order(), ancestor.ancestors.len()));
}
}
package.sort_unstable_by(|a, b| -> Ordering {
if a.2 != b.2 {
// order by ascending ancestor count
a.2.cmp(&b.2)
} else if a.1 != b.1 {
// tie-break by ascending partial txid
a.1.cmp(&b.1)
} else {
// tie-break partial txid collisions by ascending uid
a.0.cmp(&b.0)
}
});
package.push((next_tx.uid, next_tx.order(), next_tx.ancestors.len()));
let cluster_rate = next_tx.cluster_rate();
for (txid, _, _) in &package {
cluster.push(*txid);
if let Some(Some(tx)) = audit_pool.get_mut(*txid as usize) {
tx.used = true;
tx.set_dirty_if_different(cluster_rate);
transactions.push(tx.uid);
block_weight += tx.weight;
block_sigops += tx.sigops;
}
update_descendants(*txid, &mut audit_pool, &mut modified, cluster_rate);
if from_stack {
mempool_stack.pop();
} else {
modified.pop();
}
if is_cluster {
clusters.push(cluster);
}
if blocks.len() < (MAX_BLOCKS - 1)
&& ((block_weight + (4 * next_tx.ancestor_sigop_adjusted_vsize())
>= MAX_BLOCK_WEIGHT_UNITS)
|| (block_sigops + next_tx.ancestor_sigops() > BLOCK_SIGOPS))
{
// hold this package in an overflow list while we check for smaller options
overflow.push(next_tx.uid);
failures += 1;
} else {
let mut package: Vec<(u32, u32, usize)> = Vec::new();
let mut cluster: Vec<u32> = Vec::new();
let is_cluster: bool = !next_tx.ancestors.is_empty();
for ancestor_id in &next_tx.ancestors {
if let Some(Some(ancestor)) = audit_pool.get(*ancestor_id as usize) {
package.push((*ancestor_id, ancestor.order(), ancestor.ancestors.len()));
}
}
package.sort_unstable_by(|a, b| -> Ordering {
if a.2 != b.2 {
// order by ascending ancestor count
a.2.cmp(&b.2)
} else if a.1 != b.1 {
// tie-break by ascending partial txid
a.1.cmp(&b.1)
} else {
// tie-break partial txid collisions by ascending uid
a.0.cmp(&b.0)
}
});
package.push((next_tx.uid, next_tx.order(), next_tx.ancestors.len()));
failures = 0;
let cluster_rate = next_tx.cluster_rate();
for (txid, _, _) in &package {
cluster.push(*txid);
if let Some(Some(tx)) = audit_pool.get_mut(*txid as usize) {
tx.used = true;
tx.set_dirty_if_different(cluster_rate);
transactions.push(tx.uid);
block_weight += tx.weight;
block_sigops += tx.sigops;
}
update_descendants(*txid, &mut audit_pool, &mut modified, cluster_rate);
}
if is_cluster {
clusters.push(cluster);
}
failures = 0;
}
}
// this block is full
@ -203,10 +205,14 @@ pub fn gbt(mempool: &mut ThreadTransactionsMap, accelerations: &[ThreadAccelerat
let queue_is_empty = mempool_stack.is_empty() && modified.is_empty();
if (exceeded_package_tries || queue_is_empty) && blocks.len() < (MAX_BLOCKS - 1) {
// finalize this block
if !transactions.is_empty() {
blocks.push(transactions);
block_weights.push(block_weight);
if transactions.is_empty() {
info!("trying to push an empty block! breaking loop! mempool {:#?} | modified {:#?} | overflow {:#?}", mempool_stack.len(), modified.len(), overflow.len());
break;
}
blocks.push(transactions);
block_weights.push(block_weight);
// reset for the next block
transactions = Vec::with_capacity(initial_txes_per_block);
block_weight = BLOCK_RESERVED_WEIGHT;
@ -265,6 +271,7 @@ pub fn gbt(mempool: &mut ThreadTransactionsMap, accelerations: &[ThreadAccelerat
block_weights,
clusters,
rates,
overflow,
}
}

1
backend/rust-gbt/src/lib.rs
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@ -133,6 +133,7 @@ pub struct GbtResult {
pub block_weights: Vec<u32>,
pub clusters: Vec<Vec<u32>>,
pub rates: Vec<Vec<f64>>, // Tuples not supported. u32 fits inside f64
pub overflow: Vec<u32>,
}
/// All on another thread, this runs an arbitrary task in between

26
backend/src/api/mempool-blocks.ts
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@ -368,12 +368,15 @@ class MempoolBlocks {
// run the block construction algorithm in a separate thread, and wait for a result
const rustGbt = saveResults ? this.rustGbtGenerator : new GbtGenerator();
try {
const { blocks, blockWeights, rates, clusters } = this.convertNapiResultTxids(
const { blocks, blockWeights, rates, clusters, overflow } = this.convertNapiResultTxids(
await rustGbt.make(Object.values(newMempool) as RustThreadTransaction[], convertedAccelerations as RustThreadAcceleration[], this.nextUid),
);
if (saveResults) {
this.rustInitialized = true;
}
const mempoolSize = Object.keys(newMempool).length;
const resultMempoolSize = blocks.reduce((total, block) => total + block.length, 0) + overflow.length;
logger.debug(`RUST updateBlockTemplates returned ${resultMempoolSize} txs out of ${mempoolSize} in the mempool, ${overflow.length} were unmineable`);
const processed = this.processBlockTemplates(newMempool, blocks, blockWeights, rates, clusters, accelerations, accelerationPool, saveResults);
logger.debug(`RUST makeBlockTemplates completed in ${(Date.now() - start)/1000} seconds`);
return processed;
@ -424,7 +427,7 @@ class MempoolBlocks {
// run the block construction algorithm in a separate thread, and wait for a result
try {
const { blocks, blockWeights, rates, clusters } = this.convertNapiResultTxids(
const { blocks, blockWeights, rates, clusters, overflow } = this.convertNapiResultTxids(
await this.rustGbtGenerator.update(
added as RustThreadTransaction[],
removedUids,
@ -432,9 +435,10 @@ class MempoolBlocks {
this.nextUid,
),
);
const resultMempoolSize = blocks.reduce((total, block) => total + block.length, 0);
const resultMempoolSize = blocks.reduce((total, block) => total + block.length, 0) + overflow.length;
logger.debug(`RUST updateBlockTemplates returned ${resultMempoolSize} txs out of ${mempoolSize} in the mempool, ${overflow.length} were unmineable`);
if (mempoolSize !== resultMempoolSize) {
throw new Error('GBT returned wrong number of transactions, cache is probably out of sync');
throw new Error('GBT returned wrong number of transactions , cache is probably out of sync');
} else {
const processed = this.processBlockTemplates(newMempool, blocks, blockWeights, rates, clusters, accelerations, accelerationPool, true);
this.removeUids(removedUids);
@ -658,8 +662,8 @@ class MempoolBlocks {
return { blocks: convertedBlocks, rates: convertedRates, clusters: convertedClusters } as { blocks: string[][], rates: { [root: string]: number }, clusters: { [root: string]: string[] }};
}
private convertNapiResultTxids({ blocks, blockWeights, rates, clusters }: GbtResult)
: { blocks: string[][], blockWeights: number[], rates: [string, number][], clusters: string[][] } {
private convertNapiResultTxids({ blocks, blockWeights, rates, clusters, overflow }: GbtResult)
: { blocks: string[][], blockWeights: number[], rates: [string, number][], clusters: string[][], overflow: string[] } {
const convertedBlocks: string[][] = blocks.map(block => block.map(uid => {
const txid = this.uidMap.get(uid);
if (txid !== undefined) {
@ -677,7 +681,15 @@ class MempoolBlocks {
for (const cluster of clusters) {
convertedClusters.push(cluster.map(uid => this.uidMap.get(uid)) as string[]);
}
return { blocks: convertedBlocks, blockWeights, rates: convertedRates, clusters: convertedClusters };
const convertedOverflow: string[] = overflow.map(uid => {
const txid = this.uidMap.get(uid);
if (txid !== undefined) {
return txid;
} else {
throw new Error('GBT returned an unmineable transaction with unknown uid');
}
});
return { blocks: convertedBlocks, blockWeights, rates: convertedRates, clusters: convertedClusters, overflow: convertedOverflow };
}
}

3
backend/src/api/tx-selection-worker.ts
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@ -173,10 +173,13 @@ function makeBlockTemplates(mempool: Map<number, CompactThreadTransaction>)
// this block is full
const exceededPackageTries = failures > 1000 && blockWeight > (config.MEMPOOL.BLOCK_WEIGHT_UNITS - 4000);
const queueEmpty = top >= mempoolArray.length && modified.isEmpty();
if ((exceededPackageTries || queueEmpty) && blocks.length < 7) {
// construct this block
if (transactions.length) {
blocks.push(transactions.map(t => t.uid));
} else {
break;
}
// reset for the next block
transactions = [];