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crate::ix!();
/**
| Return the time it would take to redo
| the work difference between from and
| to, assuming the current hashrate corresponds
| to the difficulty at tip, in seconds.
|
*/
pub fn get_block_proof_equivalent_time(
to: Option<Arc<BlockIndex>>,
from: Option<Arc<BlockIndex>>,
tip: Option<Arc<BlockIndex>>,
params: &ChainConsensusParams) -> Duration {
todo!();
/*
ArithU256 r;
int sign = 1;
if (to.nChainWork > from.nChainWork) {
r = to.nChainWork - from.nChainWork;
} else {
r = from.nChainWork - to.nChainWork;
sign = -1;
}
r = r * ArithU256(params.nPowTargetSpacing) / GetBlockProof(tip);
if (r.bits() > 63) {
return sign * std::numeric_limits<int64_t>::max();
}
return sign * r.GetLow64();
*/
}
pub type CppIter<T: Iterator> = Peekable<Enumerate<Box<T>>>;
pub trait BlockRequested {
fn block_requested(
self: Arc<Self>,
nodeid: NodeId,
block: Option<Arc<BlockIndex>>,
pit: Amo<QueuedBlockIter>) -> bool;
}
impl BlockRequested for PeerManager {
/**
| Mark a block as in flight
|
| Returns false, still setting pit, if
| the block was already in flight from
| the same peer pit will only be valid as
| long as the same CS_MAIN lock is being
| held
|
*/
#[EXCLUSIVE_LOCKS_REQUIRED(CS_MAIN)]
fn block_requested(
self: Arc<Self>,
nodeid: NodeId,
block: Option<Arc<BlockIndex>>,
pit: Amo<QueuedBlockIter>) -> bool {
assert!(block.is_some());
let hash: &u256 = &block.as_ref().unwrap().get_block_hash();
let state: Amo<NodeState> = create_state(nodeid);
assert!(state.is_some());
let mut inner = self.inner.lock();
let mut mbif = inner.map_blocks_in_flight.lock();
// Short-circuit most stuff in case it is
// from the same node
let mut it_in_flight = mbif.get(hash);
if it_in_flight.is_some()
&& it_in_flight.unwrap().0 == nodeid {
if pit.is_some() {
pit.replace(&it_in_flight.unwrap().1);
}
return false;
}
// Make sure it's not listed somewhere
// already.
inner.remove_block_request(hash);
let partial_block = match pit.is_some() {
true => Amo::from(PartiallyDownloadedBlock::new(amo_none())),
false => amo_none(),
};
state.get_mut().blocks_in_flight.push(
QueuedBlock {
pindex: block.clone(),
partial_block
}
);
let len = state.get().blocks_in_flight.len();
let mut it = state.get_mut().blocks_in_flight_iter();;
it.advance_by(len - 1);
state.get_mut().n_blocks_in_flight.fetch_add(1,atomic::Ordering::Relaxed);
if state.get().n_blocks_in_flight.load(atomic::Ordering::Relaxed) == 1 {
// We're starting a block download (batch) from this peer.
state.get_mut().downloading_since = get_datetime();
inner.peers_downloading_from.fetch_add(1, atomic::Ordering::Relaxed);
}
let it_in_flight = mbif.insert(hash.clone(), (nodeid,it));
if pit.is_some() {
*pit.get_mut() = it_in_flight.unwrap().1;
}
true
}
}