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Support variable session length for Rococo chains at genesis (#2167)

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This pr adds support to change the session length of a Rococo chain at
genesis. This is rather useful because Rococo has a session length of
1 hour, while on rococo-local you will now get 1 minute. This improves
the dev experience, because a parachain is only going live at the
start of a new session.
This commit is contained in:
Bastian Köcher
2020-12-24 21:25:15 +01:00
committed by GitHub
parent 2557181ecf
commit bb856698a4
5 changed files with 44 additions and 9 deletions
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polkadot/node/service/src/chain_spec.rs
+35 -3
View File
@@ -66,7 +66,32 @@ pub type KusamaChainSpec = service::GenericChainSpec<kusama::GenesisConfig, Exte
pub type WestendChainSpec = service::GenericChainSpec<westend::GenesisConfig, Extensions>;
/// The `ChainSpec` parametrized for the rococo runtime.
pub type RococoChainSpec = service::GenericChainSpec<rococo::GenesisConfig, Extensions>;
pub type RococoChainSpec = service::GenericChainSpec<RococoGenesisExt, Extensions>;
/// Extension for the Rococo genesis config to support a custom changes to the genesis state.
#[derive(serde::Serialize, serde::Deserialize)]
pub struct RococoGenesisExt {
/// The runtime genesis config.
runtime_genesis_config: rococo::GenesisConfig,
/// The session length in blocks.
///
/// If `None` is supplied, the default value is used.
session_length_in_blocks: Option<u32>,
}
impl sp_runtime::BuildStorage for RococoGenesisExt {
fn assimilate_storage(
&self,
storage: &mut sp_core::storage::Storage,
) -> Result<(), String> {
sp_state_machine::BasicExternalities::execute_with_storage(storage, || {
if let Some(length) = self.session_length_in_blocks.as_ref() {
rococo::constants::time::EpochDurationInBlocks::set(length);
}
});
self.runtime_genesis_config.assimilate_storage(storage)
}
}
pub fn polkadot_config() -> Result<PolkadotChainSpec, String> {
PolkadotChainSpec::from_json_bytes(&include_bytes!("../res/polkadot.json")[..])
@@ -925,7 +950,10 @@ pub fn rococo_staging_testnet_config() -> Result<RococoChainSpec, String> {
"Rococo Staging Testnet",
"rococo_staging_testnet",
ChainType::Live,
move || rococo_staging_testnet_config_genesis(wasm_binary),
move || RococoGenesisExt {
runtime_genesis_config: rococo_staging_testnet_config_genesis(wasm_binary),
session_length_in_blocks: None,
},
boot_nodes,
Some(
TelemetryEndpoints::new(vec![(ROCOCO_STAGING_TELEMETRY_URL.to_string(), 0)])
@@ -1542,7 +1570,11 @@ pub fn rococo_local_testnet_config() -> Result<RococoChainSpec, String> {
"Rococo Local Testnet",
"rococo_local_testnet",
ChainType::Local,
move || rococo_local_testnet_genesis(wasm_binary),
move || RococoGenesisExt {
runtime_genesis_config: rococo_local_testnet_genesis(wasm_binary),
// Use 1 minute session length.
session_length_in_blocks: Some(10),
},
vec![],
None,
Some(DEFAULT_PROTOCOL_ID),