pub enum Request {
TransactionIds,
TransactionsById(HashSet<UnminedTxId>),
TransactionsByMinedId(HashSet<Hash>),
AwaitOutput(OutPoint),
TransactionWithDepsByMinedId(Hash),
FullTransactions,
RejectedTransactionIds(HashSet<UnminedTxId>),
Queue(Vec<Gossip>),
CheckForVerifiedTransactions,
}Expand description
A mempool service request.
Requests can query the current set of mempool transactions, queue transactions to be downloaded and verified, or run the mempool to check for newly verified transactions.
Requests can’t modify the mempool directly, because all mempool transactions must be verified.
Variants§
TransactionIds
Query all UnminedTxIds in the mempool.
TransactionsById(HashSet<UnminedTxId>)
Query matching UnminedTx in the mempool,
using a unique set of UnminedTxIds.
TransactionsByMinedId(HashSet<Hash>)
Query matching UnminedTx in the mempool,
using a unique set of transaction::Hashes. Pre-V5 transactions are matched
directly; V5 transaction are matched just by the Hash, disregarding
the AuthDigest.
AwaitOutput(OutPoint)
Request a transparent::Output identified by the given OutPoint,
waiting until it becomes available if it is unknown.
This request is purely informational, and there are no guarantees about whether the UTXO remains unspent or is on the best chain, or any chain. Its purpose is to allow orphaned mempool transaction verification.
§Correctness
Output requests should be wrapped in a timeout, so that out-of-order and invalid requests do not hang indefinitely.
Outdated requests are pruned on a regular basis.
TransactionWithDepsByMinedId(Hash)
Request a VerifiedUnminedTx and its dependencies by its mined id.
FullTransactions
Get all the VerifiedUnminedTx in the mempool.
Equivalent to TransactionsById(TransactionIds),
but each transaction also includes the miner_fee and legacy_sigop_count fields.
RejectedTransactionIds(HashSet<UnminedTxId>)
Query matching cached rejected transaction IDs in the mempool,
using a unique set of UnminedTxIds.
Queue(Vec<Gossip>)
Queue a list of gossiped transactions or transaction IDs, or crawled transaction IDs.
The transaction downloader checks for duplicates across IDs and transactions.
CheckForVerifiedTransactions
Check for newly verified transactions.
The transaction downloader does not push transactions into the mempool. So a task should send this request regularly (every 5-10 seconds).
These checks also happen for other request variants, but we can’t rely on peers to send queries regularly, and crawler queue requests depend on peer responses. Also, crawler requests aren’t frequent enough for transaction propagation.
§Correctness
This request is required to avoid hangs in the mempool.
The queue checker task can’t call poll_ready directly on the mempool
service, because the service is wrapped in a Buffer. Calling
Buffer::poll_ready reserves a buffer slot, which can cause hangs
when too many slots are reserved but unused:
https://docs.rs/tower/0.4.10/tower/buffer/struct.Buffer.html#a-note-on-choosing-a-bound
Trait Implementations§
impl Eq for Request
impl StructuralPartialEq for Request
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impl Freeze for Request
impl RefUnwindSafe for Request
impl Send for Request
impl Sync for Request
impl Unpin for Request
impl UnwindSafe for Request
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
Immutable access to the
Borrow<B> of a value. Read more§fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
Mutable access to the
BorrowMut<B> of a value. Read more§fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
Immutable access to the
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
Mutable access to the
AsMut<R> view of a value. Read more§fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
Immutable access to the
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
Mutable access to the
Deref::Target of a value. Read more§fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self
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builds.§fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
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builds.§fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
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builds.§fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
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.tap_ref() only in debug builds, and is erased in release
builds.§fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
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.tap_ref_mut() only in debug builds, and is erased in release
builds.§fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
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.tap_deref() only in debug builds, and is erased in release
builds.