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Add cumulus-service (#187)

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* Add cumulus-service

Crate that abstracts the service of a parachain.

* Make finalization infallible
This commit is contained in:
Bastian Köcher
2020-08-08 08:07:33 +02:00
committed by GitHub
parent 1fcd05503a
commit 9603b2fe5f
11 changed files with 422 additions and 145 deletions
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consensus/src/lib.rs
+31 -20
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@@ -26,12 +26,10 @@ use sp_runtime::{
traits::{Block as BlockT, Header as HeaderT},
};
use polkadot_primitives::v0::{
Id as ParaId, ParachainHost, Block as PBlock, Hash as PHash,
};
use polkadot_primitives::v0::{Block as PBlock, Hash as PHash, Id as ParaId, ParachainHost};
use codec::Decode;
use futures::{future, Future, FutureExt, Stream, StreamExt, TryFutureExt, TryStreamExt};
use futures::{future, Future, FutureExt, Stream, StreamExt};
use log::{error, trace, warn};
use std::{marker::PhantomData, sync::Arc};
@@ -118,26 +116,39 @@ where
polkadot
.finalized_heads(para_id)?
.map(|head_data| {
<<Block as BlockT>::Header>::decode(&mut &head_data[..])
.map_err(|_| Error::InvalidHeadData)
.filter_map(|head_data| {
let res = match <<Block as BlockT>::Header>::decode(&mut &head_data[..]) {
Ok(header) => Some(header),
Err(err) => {
warn!(
target: "cumulus-consensus",
"Could not decode Parachain header for finalizing: {:?}",
err,
);
None
}
};
future::ready(res)
})
.try_for_each(move |p_head| {
future::ready(
finalize_block(&*local, p_head.hash())
.map_err(Error::Client)
.map(|_| ()),
)
.for_each(move |p_head| {
if let Err(e) = finalize_block(&*local, p_head.hash()) {
warn!(
target: "cumulus-consensus",
"Failed to finalize block: {:?}",
e,
);
}
future::ready(())
})
.map_err(|e| {
warn!(
target: "cumulus-consensus",
"Failed to finalize block: {:?}", e)
})
.map(|_| ())
};
Ok(future::select(follow_finalized, follow_new_best(para_id, local, polkadot, announce_block)?).map(|_| ()))
Ok(future::select(
follow_finalized,
follow_new_best(para_id, local, polkadot, announce_block)?,
)
.map(|_| ()))
}
/// Follow the relay chain new best head, to update the Parachain new best head.