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Downward Message Processing implementation (#1859)

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* DMP: data structures and plumbing

* DMP: Implement DMP logic in the router module

DMP: Integrate DMP parts into the inclusion module

* DMP: Introduce the max size limit for the size of a downward message

* DMP: Runtime API for accessing inbound messages

* OCD

Small clean ups

* DMP: fix the naming of the error

* DMP: add caution about a non-existent recipient
This commit is contained in:
Sergei Shulepov
2020-10-28 11:41:42 +01:00
committed by GitHub
parent 1a25c41277
commit 9903bca259
26 changed files with 556 additions and 36 deletions
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polkadot/core-primitives/src/lib.rs
+12 -13
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@@ -79,20 +79,19 @@ pub use sp_runtime::OpaqueExtrinsic as UncheckedExtrinsic;
/// the parachain.
pub type Remark = [u8; 32];
/// These are special "control" messages that can be passed from the Relaychain to a parachain.
/// They should be handled by all parachains.
/// A message sent from the relay-chain down to a parachain.
///
/// The size of the message is limited by the `config.max_downward_message_size` parameter.
pub type DownwardMessage = sp_std::vec::Vec<u8>;
/// A wrapped version of `DownwardMessage`. The difference is that it has attached the block number when
/// the message was sent.
#[derive(codec::Encode, codec::Decode, Clone, sp_runtime::RuntimeDebug, PartialEq)]
pub enum DownwardMessage<AccountId = crate::AccountId> {
/// Some funds were transferred into the parachain's account. The hash is the identifier that
/// was given with the transfer.
TransferInto(AccountId, Balance, Remark),
/// An opaque blob of data. The relay chain must somehow know how to form this so that the
/// destination parachain does something sensible.
///
/// NOTE: Be very careful not to allow users to place arbitrary size information in here.
Opaque(sp_std::vec::Vec<u8>),
/// XCMP message for the Parachain.
XCMPMessage(sp_std::vec::Vec<u8>),
pub struct InboundDownwardMessage<BlockNumber = crate::BlockNumber> {
/// The block number at which this messages was put into the downward message queue.
pub sent_at: BlockNumber,
/// The actual downward message to processes.
pub msg: DownwardMessage,
}
/// V1 primitives.