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Use BABE instead of AuRa in node (#3171)

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* babe: add babe module trait

* babe: track current slot and epoch start slot

* babe: implement ShouldEndSession based on epochs

* babe: rename weight type to avoid ambiguities

* babe: expose epoch start slot in Epoch digest

* babe: use epoch start for validating epoch transitions

* babe: make the epoch duration a parameter type

* babe: remove unused fields from config

* node: update runtime to use babe instead of aura

* node: use babe instead of aura

* core: generate sr25519 keys from seed and add to keystore

* core: remove AuthorityKeyring

* node: remove unused primitive types related to babe crypto

* uniform babe primitives crate import name

* wrap long lines

* babe: fix find_epoch_digest

* fork-tree: fix find_node_where

* node: set babe epoch duration to "10 minutes"

* babe: cleanup import key cache if authorities don't change

* node: make integration test compile (but fail)

* node: bump spec_version

* node: fix import

* babe: don't use constants in storage fields array sizes

* babe: account for first epoch slot way in the past

* babe: signal next epoch change (not current)

* babe: calculate next epoch randomness with next epoch index

* babe: track next epoch in node

* babe: cache current epoch and authorities separately

* babe: generate valid babe vrf proofs in integration test

* babe: cleanup claim_slot

* babe: perform threshold calculation according to spec

* babe: compute relative weight in threshold

* babe: more precise threshold calculation

* babe: use floats for threshold exponent calculation

* babe: update constant c
This commit is contained in:
André Silva
2019-07-24 20:53:04 +01:00
committed by DemiMarie-parity
parent 407970406d
commit 9f50c8fce4
33 changed files with 784 additions and 429 deletions
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substrate/core/consensus/babe/primitives/src/lib.rs
+20 -24
View File
@@ -24,16 +24,21 @@ mod digest;
use parity_codec::{Encode, Decode};
use rstd::vec::Vec;
use runtime_primitives::ConsensusEngineId;
use substrate_primitives::sr25519::Public;
use substrate_primitives::sr25519;
use substrate_client::decl_runtime_apis;
#[cfg(feature = "std")]
pub use digest::{BabePreDigest, CompatibleDigestItem};
pub use digest::{BABE_VRF_PREFIX, RawBabePreDigest};
/// A Babe authority keypair. Necessarily equivalent to the schnorrkel public key used in
/// the main Babe module. If that ever changes, then this must, too.
#[cfg(feature = "std")]
pub type AuthorityPair = sr25519::Pair;
/// A Babe authority identifier. Necessarily equivalent to the schnorrkel public key used in
/// the main Babe module. If that ever changes, then this must, too.
pub type AuthorityId = Public;
pub type AuthorityId = sr25519::Public;
/// The `ConsensusEngineId` of BABE.
pub const BABE_ENGINE_ID: ConsensusEngineId = *b"BABE";
@@ -54,20 +59,24 @@ pub type AuthorityIndex = u64;
pub type SlotNumber = u64;
/// The weight of an authority.
pub type Weight = u64;
// NOTE: we use a unique name for the weight to avoid conflicts with other
// `Weight` types, since the metadata isn't able to disambiguate.
pub type BabeWeight = u64;
/// BABE epoch information
#[derive(Decode, Encode, Default, PartialEq, Eq, Clone)]
#[cfg_attr(any(feature = "std", test), derive(Debug))]
pub struct Epoch {
/// The authorities and their weights
pub authorities: Vec<(AuthorityId, Weight)>,
/// The epoch index
pub epoch_index: u64,
/// Randomness for this epoch
pub randomness: [u8; VRF_OUTPUT_LENGTH],
/// The starting slot of the epoch,
pub start_slot: u64,
/// The duration of this epoch
pub duration: SlotNumber,
/// The authorities and their weights
pub authorities: Vec<(AuthorityId, BabeWeight)>,
/// Randomness for this epoch
pub randomness: [u8; VRF_OUTPUT_LENGTH],
}
/// An consensus log item for BABE.
@@ -93,23 +102,10 @@ pub struct BabeConfiguration {
/// Dynamic slot duration may be supported in the future.
pub slot_duration: u64,
/// The number of slots per BABE epoch. Currently, only
/// the value provided by this type at genesis will be used.
///
/// Dynamic slot duration may be supported in the future.
pub slots_per_epoch: u64,
/// The expected block time in milliseconds for BABE. Currently,
/// only the value provided by this type at genesis will be used.
///
/// Dynamic expected block time may be supported in the future.
pub expected_block_time: u64,
/// The maximum permitted VRF output, or *threshold*, for BABE. Currently,
/// only the value provided by this type at genesis will be used.
///
/// Dynamic thresholds may be supported in the future.
pub threshold: u64,
/// A constant value that is used in the threshold calculation formula.
/// Expressed as a fraction where the first member of the tuple is the
/// numerator and the second is the denominator.
pub c: (u64, u64),
/// The minimum number of blocks that must be received before running the
/// median algorithm to compute the offset between the on-chain time and the