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srml: babe: add expected block time and epoch duration constants (#3241)

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* srml: babe: add expected block time constant

* srml: babe: expose epoch duration constant

* node: bump spec_version

* core: don't use moment type in test-runtime

* babe: add docs regarding c parameter
This commit is contained in:
André Silva
2019-07-30 06:39:33 +01:00
committed by Gavin Wood
parent 20eb52d6bb
commit 483ad60379
5 changed files with 27 additions and 6 deletions
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substrate/node/runtime/src/constants.rs
+2 -1
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@@ -34,7 +34,8 @@ pub mod time {
/// by `SLOT_DURATION`, but some slots will not be allocated to any
/// authority and hence no block will be produced. We expect to have this
/// block time on average following the defined slot duration and the value
/// of `c` configured for BABE.
/// of `c` configured for BABE (where `1 - c` represents the probability of
/// a slot being empty).
/// This value is only used indirectly to define the unit constants below
/// that are expressed in blocks. The rest of the code should use
/// `SLOT_DURATION` instead (like the timestamp module for calculating the
substrate/node/runtime/src/lib.rs
+7 -4
View File
@@ -79,7 +79,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
// and set impl_version to equal spec_version. If only runtime
// implementation changes and behavior does not, then leave spec_version as
// is and increment impl_version.
spec_version: 122,
spec_version: 123,
impl_version: 123,
apis: RUNTIME_API_VERSIONS,
};
@@ -128,10 +128,12 @@ impl system::Trait for Runtime {
parameter_types! {
pub const EpochDuration: u64 = EPOCH_DURATION_IN_SLOTS;
pub const ExpectedBlockTime: Moment = MILLISECS_PER_BLOCK;
}
impl babe::Trait for Runtime {
type EpochDuration = EpochDuration;
type ExpectedBlockTime = ExpectedBlockTime;
}
impl indices::Trait for Runtime {
@@ -517,9 +519,10 @@ impl_runtime_apis! {
impl babe_primitives::BabeApi<Block> for Runtime {
fn startup_data() -> babe_primitives::BabeConfiguration {
// The choice of `c` parameter is done in accordance to
// the slot duration and expected target block time, for
// safely resisting network delays of maximum two seconds.
// The choice of `c` parameter (where `1 - c` represents the
// probability of a slot being empty), is done in accordance to the
// slot duration and expected target block time, for safely
// resisting network delays of maximum two seconds.
// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
babe_primitives::BabeConfiguration {
median_required_blocks: 1000,