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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| // Copyright 2022-2024 Protocol Labs | ||
| // SPDX-License-Identifier: Apache-2.0, MIT | ||
|
|
||
| use crate::vote::Weight; | ||
| use crate::{BlockHash, BlockHeight, Bytes}; | ||
| use anyhow::anyhow; | ||
| use fendermint_vm_genesis::ValidatorKey; | ||
| use secp256k1::ecdsa::{RecoverableSignature, RecoveryId}; | ||
| use serde::{Deserialize, Serialize}; | ||
| use std::collections::HashMap; | ||
| use std::fmt::{Display, Formatter}; | ||
|
|
||
| pub type Signature = Bytes; | ||
| pub type RecoverableECDSASignature = (i32, Vec<u8>); | ||
|
|
||
| pub type PowerTable = HashMap<ValidatorKey, Weight>; | ||
|
|
||
| /// The different versions of vote casted in topdown gossip pub-sub channel | ||
| #[derive(Serialize, Deserialize, Debug, Clone, Eq, PartialEq)] | ||
| pub enum Vote { | ||
| V1 { | ||
| validator: ValidatorKey, | ||
| payload: CertifiedObservation, | ||
| }, | ||
| } | ||
|
|
||
| /// The actual content that validators should agree upon, or put in another way the content | ||
| /// that a quorum should be formed upon | ||
| #[derive(Serialize, Deserialize, Hash, Debug, Clone, Eq, PartialEq)] | ||
| pub struct Ballot { | ||
| parent_height: u64, | ||
| /// The hash of the chain unit at that height. Usually a block hash, but could | ||
| /// be another entity (e.g. tipset CID), depending on the parent chain | ||
| /// and our interface to it. For example, if the parent is a Filecoin network, | ||
| /// this would be a tipset CID coerced into a block hash if queried through | ||
| /// the Eth API, or the tipset CID as-is if accessed through the Filecoin API. | ||
| parent_hash: Bytes, | ||
| /// A rolling/cumulative commitment to topdown effects since the beginning of | ||
| /// time, including the ones in this block. | ||
| cumulative_effects_comm: Bytes, | ||
| } | ||
|
|
||
| /// The content that validators gossip among each other | ||
| #[derive(Serialize, Deserialize, Debug, Clone, Eq, PartialEq)] | ||
| pub struct Observation { | ||
| /// The hash of the subnet's last committed block when this observation was made. | ||
| /// Used to discard stale observations that are, e.g. replayed by an attacker | ||
| /// at a later time. Also used to detect nodes that might be wrongly gossiping | ||
| /// whilst being out of sync. | ||
| local_hash: BlockHash, | ||
| ballot: Ballot, | ||
| } | ||
|
|
||
| /// A self-certified observation made by a validator. | ||
| #[derive(Serialize, Deserialize, Debug, Clone, Eq, PartialEq)] | ||
| pub struct CertifiedObservation { | ||
| observed: Observation, | ||
| /// A "recoverable" ECDSA signature with the validator's secp256k1 private key over the | ||
| /// CID of the DAG-CBOR encoded observation using a BLAKE2b-256 multihash. | ||
| signature: RecoverableECDSASignature, | ||
| } | ||
|
|
||
| impl Vote { | ||
| pub fn voter(&self) -> ValidatorKey { | ||
| match self { | ||
| Self::V1 { validator, .. } => validator.clone(), | ||
| } | ||
| } | ||
|
|
||
| pub fn ballot(&self) -> &Ballot { | ||
| match self { | ||
| Self::V1 { payload, .. } => &payload.observed.ballot, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl TryFrom<&[u8]> for Vote { | ||
| type Error = anyhow::Error; | ||
|
|
||
| fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> { | ||
| let version = bytes[0]; | ||
|
|
||
| if version == 0 { | ||
| let obs = CertifiedObservation::try_from(&bytes[1..])?; | ||
| let to_sign = fvm_ipld_encoding::to_vec(&obs.observed)?; | ||
| let (validator, _) = recover_ecdsa_sig(&to_sign, obs.signature.0, &obs.signature.1)?; | ||
| return Ok(Self::V1 { | ||
| validator, | ||
| payload: obs, | ||
| }); | ||
| } | ||
|
|
||
| Err(anyhow!("invalid vote version")) | ||
| } | ||
| } | ||
|
|
||
| impl TryFrom<&[u8]> for CertifiedObservation { | ||
| type Error = anyhow::Error; | ||
|
|
||
| fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> { | ||
| Ok(fvm_ipld_encoding::from_slice(bytes)?) | ||
| } | ||
| } | ||
|
|
||
| fn recover_ecdsa_sig( | ||
| payload: &[u8], | ||
| rec_id: i32, | ||
| sig: &[u8], | ||
| ) -> anyhow::Result<(ValidatorKey, Signature)> { | ||
| let secp = secp256k1::Secp256k1::new(); | ||
|
|
||
| let message = secp256k1::Message::from_hashed_data::<secp256k1::hashes::sha256::Hash>(payload); | ||
| let pubkey = secp.recover_ecdsa( | ||
| &message, | ||
| &RecoverableSignature::from_compact(sig, RecoveryId::from_i32(rec_id)?)?, | ||
| )?; | ||
| let signature = secp256k1::ecdsa::Signature::from_compact(sig)? | ||
| .serialize_der() | ||
| .to_vec(); | ||
|
|
||
| Ok(( | ||
| ValidatorKey::from_compressed_pubkey(&pubkey.serialize())?, | ||
| signature, | ||
| )) | ||
| } | ||
|
|
||
| impl Display for Ballot { | ||
| fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { | ||
| write!( | ||
| f, | ||
| "Ballot(parent_height={}, parent_hash={}, commitment={})", | ||
| self.parent_height, | ||
| hex::encode(&self.parent_hash), | ||
| hex::encode(&self.cumulative_effects_comm), | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| impl Ballot { | ||
| pub fn parent_height(&self) -> BlockHeight { | ||
| self.parent_height | ||
| } | ||
| } |
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