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// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Polkadot.
// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
//! Requests and responses as sent over the wire for the individual protocols.
use codec::{Decode, Encode};
use polkadot_node_primitives::ErasureChunk;
use polkadot_primitives::{
vstaging::CommittedCandidateReceiptV2 as CommittedCandidateReceipt, CandidateHash, Hash,
Id as ParaId, PersistedValidationData, UncheckedSignedStatement, ValidatorIndex,
};
use super::{v1, IsRequest, Protocol};
use crate::v2::StatementFilter;
/// Request a candidate with statements.
#[derive(Debug, Clone, Encode, Decode)]
pub struct AttestedCandidateRequest {
/// Hash of the candidate we want to request.
pub candidate_hash: CandidateHash,
/// Statement filter with 'OR' semantics, indicating which validators
/// not to send statements for.
///
/// The filter must have exactly the minimum size required to
/// fit all validators from the backing group.
///
/// The response may not contain any statements masked out by this mask.
pub mask: StatementFilter,
}
/// Response to an `AttestedCandidateRequest`.
#[derive(Debug, Clone, Encode, Decode)]
pub struct AttestedCandidateResponse {
/// The candidate receipt, with commitments.
pub candidate_receipt: CommittedCandidateReceipt,
/// The [`PersistedValidationData`] corresponding to the candidate.
pub persisted_validation_data: PersistedValidationData,
/// All known statements about the candidate, in compact form,
/// omitting `Seconded` statements which were intended to be masked
/// out.
pub statements: Vec<UncheckedSignedStatement>,
}
impl IsRequest for AttestedCandidateRequest {
type Response = AttestedCandidateResponse;
const PROTOCOL: Protocol = Protocol::AttestedCandidateV2;
}
/// Responses as sent by collators.
pub type CollationFetchingResponse = super::v1::CollationFetchingResponse;
/// Request the advertised collation at that relay-parent.
#[derive(Debug, Clone, Encode, Decode)]
pub struct CollationFetchingRequest {
/// Relay parent collation is built on top of.
pub relay_parent: Hash,
/// The `ParaId` of the collation.
pub para_id: ParaId,
/// Candidate hash.
pub candidate_hash: CandidateHash,
}
impl IsRequest for CollationFetchingRequest {
// The response is the same as for V1.
type Response = CollationFetchingResponse;
const PROTOCOL: Protocol = Protocol::CollationFetchingV2;
}
/// Request an availability chunk.
#[derive(Debug, Copy, Clone, Encode, Decode)]
pub struct ChunkFetchingRequest {
/// Hash of candidate we want a chunk for.
pub candidate_hash: CandidateHash,
/// The validator index we are requesting from. This may not be identical to the index of the
/// chunk we'll receive. It's up to the caller to decide whether they need to validate they got
/// the chunk they were expecting.
pub index: ValidatorIndex,
}
/// Receive a requested erasure chunk.
#[derive(Debug, Clone, Encode, Decode)]
pub enum ChunkFetchingResponse {
/// The requested chunk data.
#[codec(index = 0)]
Chunk(ErasureChunk),
/// Node was not in possession of the requested chunk.
#[codec(index = 1)]
NoSuchChunk,
}
impl From<Option<ErasureChunk>> for ChunkFetchingResponse {
fn from(x: Option<ErasureChunk>) -> Self {
match x {
Some(c) => ChunkFetchingResponse::Chunk(c),
None => ChunkFetchingResponse::NoSuchChunk,
}
}
}
impl From<ChunkFetchingResponse> for Option<ErasureChunk> {
fn from(x: ChunkFetchingResponse) -> Self {
match x {
ChunkFetchingResponse::Chunk(c) => Some(c),
ChunkFetchingResponse::NoSuchChunk => None,
}
}
}
impl From<v1::ChunkFetchingRequest> for ChunkFetchingRequest {
fn from(v1::ChunkFetchingRequest { candidate_hash, index }: v1::ChunkFetchingRequest) -> Self {
Self { candidate_hash, index }
}
}
impl From<ChunkFetchingRequest> for v1::ChunkFetchingRequest {
fn from(ChunkFetchingRequest { candidate_hash, index }: ChunkFetchingRequest) -> Self {
Self { candidate_hash, index }
}
}
impl IsRequest for ChunkFetchingRequest {
type Response = ChunkFetchingResponse;
const PROTOCOL: Protocol = Protocol::ChunkFetchingV2;
}