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process.rs
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process.rs
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use super::{Blockchain, Branch, Error, ErrorKind, PreCheckedHeader, Ref};
use crate::{
blockcfg::{Block, Header, HeaderHash},
intercom::{BlockMsg, NetworkMsg},
leadership::NewEpochToSchedule,
network::p2p::topology::NodeId,
stats_counter::StatsCounter,
utils::{
async_msg::MessageBox,
task::{Input, TokioServiceInfo},
},
};
use chain_core::property::{Block as _, HasHeader as _};
use futures::future::Either;
use slog::Logger;
use tokio::{prelude::*, sync::mpsc::Sender};
use std::convert::identity;
pub fn handle_input(
info: &TokioServiceInfo,
blockchain: &mut Blockchain,
blockchain_tip: &mut Branch,
_stats_counter: &StatsCounter,
new_epoch_announcements: &mut Sender<NewEpochToSchedule>,
network_msg_box: &mut MessageBox<NetworkMsg>,
input: Input<BlockMsg>,
) -> Result<(), ()> {
let bquery = match input {
Input::Shutdown => {
// TODO: is there some work to do here to clean up the
// the state and make sure all state is saved properly
return Ok(());
}
Input::Input(msg) => msg,
};
match bquery {
BlockMsg::LeadershipExpectEndOfEpoch(epoch) => unimplemented!(),
BlockMsg::LeadershipBlock(block) => {
let future = process_leadership_block(blockchain.clone(), block);
let new_block_ref = future.wait().unwrap();
blockchain_tip.update_ref(new_block_ref).wait().unwrap();
}
BlockMsg::AnnouncedBlock(header, node_id) => unimplemented!(),
BlockMsg::NetworkBlock(block, reply) => unimplemented!(),
BlockMsg::ChainHeaders(headers, reply) => unimplemented!(),
};
Ok(())
}
pub fn process_leadership_block(
mut blockchain: Blockchain,
block: Block,
) -> impl Future<Item = Ref, Error = Error> {
let mut end_blockchain = blockchain.clone();
let header = block.header();
let parent_hash = block.parent_id();
// This is a trusted block from the leadership task,
// so we can skip pre-validation.
blockchain
.get_ref(parent_hash)
.and_then(move |parent| {
if let Some(parent_ref) = parent {
Either::A(blockchain.post_check_header(header, parent_ref))
} else {
Either::B(future::err(
ErrorKind::MissingParentBlockFromStorage(header).into(),
))
}
})
.and_then(move |post_checked| end_blockchain.apply_and_store_block(post_checked, block))
}
pub fn process_block_announcement(
mut blockchain: Blockchain,
branch: Branch,
header: Header,
node_id: NodeId,
mut network_msg_box: MessageBox<NetworkMsg>,
logger: Logger,
) -> impl Future<Item = (), Error = Error> {
blockchain
.pre_check_header(header)
.and_then(move |pre_checked| match pre_checked {
PreCheckedHeader::AlreadyPresent { .. } => {
debug!(logger, "block is already present");
Either::A(future::ok(()))
}
PreCheckedHeader::MissingParent { header, .. } => {
debug!(logger, "block is missing a locally stored parent");
let to = header.hash();
Either::B(blockchain.get_checkpoints(branch).map(move |from| {
network_msg_box
.try_send(NetworkMsg::PullHeaders { node_id, from, to })
.unwrap_or_else(move |err| {
error!(
logger,
"cannot send PullHeaders request to network: {}", err
)
});
}))
}
PreCheckedHeader::HeaderWithCache { header, parent_ref } => {
debug!(
logger,
"Announced block has a locally stored parent, fetch it"
);
network_msg_box
.try_send(NetworkMsg::GetNextBlock(node_id, header.hash()))
.unwrap_or_else(move |err| {
error!(
logger,
"cannot send GetNextBlock request to network: {}", err
)
});
Either::A(future::ok(()))
}
})
}
pub fn process_network_block(
mut blockchain: Blockchain,
block: Block,
mut network_msg_box: MessageBox<NetworkMsg>,
logger: Logger,
) -> impl Future<Item = (), Error = Error> {
let mut end_blockchain = blockchain.clone();
let header = block.header();
blockchain
.pre_check_header(header)
.and_then(move |pre_checked| match pre_checked {
PreCheckedHeader::AlreadyPresent { .. } => {
debug!(logger, "block is already present");
Either::A(future::ok(()))
}
PreCheckedHeader::MissingParent { header, .. } => {
debug!(logger, "block is missing a locally stored parent");
Either::A(future::err(
ErrorKind::MissingParentBlockFromStorage(header).into(),
))
}
PreCheckedHeader::HeaderWithCache { header, parent_ref } => {
let post_check_and_apply = blockchain
.post_check_header(header, parent_ref)
.and_then(move |post_checked| {
end_blockchain.apply_and_store_block(post_checked, block)
})
.map(move |_| {
// TODO: advance branch?
debug!(logger, "block successfully applied");
});
Either::B(post_check_and_apply)
}
})
}
pub fn process_chain_headers_into_block_request<S>(
mut blockchain: Blockchain,
headers: S,
logger: Logger,
) -> impl Future<Item = Vec<HeaderHash>, Error = Error>
where
S: Stream<Item = Header>,
{
headers
.map_err(|e| {
// TODO: map the incoming stream error to the result error
unimplemented!()
})
.and_then(move |header| {
blockchain
.pre_check_header(header)
.and_then(move |pre_checked| match pre_checked {
PreCheckedHeader::AlreadyPresent { .. } => {
// The block is already present. This may happen
// if the peer has started from an earlier checkpoint
// than our tip, so ignore this and proceed.
Ok(None)
}
PreCheckedHeader::MissingParent { header, .. } => {
// TODO: this fails on the first header after the
// immediate descendant of the local tip. Need branch storage
// that would store the whole header chain without blocks,
// so that the chain can be pre-validated first and blocks
// fetched afterwards in arbitrary order.
Err(ErrorKind::MissingParentBlockFromStorage(header).into())
}
PreCheckedHeader::HeaderWithCache { header, parent_ref } => {
// TODO: limit the headers to the single epoch
// before pausing to retrieve blocks.
Ok(Some(header.hash()))
}
})
})
.filter_map(identity)
.collect()
}