Crate cumulus_pallet_parachain_system

cumulus-pallet-parachain-system is a base pallet for Cumulus-based parachains.

This pallet handles low-level details of being a parachain. Its responsibilities include:

• ingestion of the parachain validation data;
• ingestion and dispatch of incoming downward and lateral messages;
• coordinating upgrades with the Relay Chain; and
• communication of parachain outputs, such as sent messages, signaling an upgrade, etc.

Users must ensure that they register this pallet as an inherent provider.

Re-exports

• pub use consensus_hook::ConsensusHook;
• pub use consensus_hook::ExpectParentIncluded;
• pub use relay_state_snapshot::MessagingStateSnapshot;
• pub use relay_state_snapshot::RelayChainStateProof;
• pub use pallet::*;

Modules

• consensus_hook
  The definition of a ConsensusHook trait for consensus logic to manage the backlog of parachain blocks ready to submit to the relay chain, as well as some basic implementations.
• migration
• pallet
  The pallet module in each FRAME pallet hosts the most important items needed to construct this pallet.
• relay_state_snapshot
  Relay chain state proof provides means for accessing part of relay chain storage for reads.
• validate_block
  A module that enables a runtime to work as parachain.

Macros

• register_validate_block
  Register the validate_block function that is used by parachains to validate blocks on a validator.

Structs

• AnyRelayNumber
  Provides an implementation of CheckAssociatedRelayNumber.
• ParachainSetCode
• RelayChainState
  Holds the most recent relay-parent state root and block number of the current parachain block.
• RelayNumberMonotonicallyIncreases
  Provides an implementation of CheckAssociatedRelayNumber.
• RelayNumberStrictlyIncreases
  Provides an implementation of CheckAssociatedRelayNumber.
• RelaychainBlockNumberProviderDeprecated
  Implements [BlockNumberProvider] that returns relay chain block number fetched from validation data. When validation data is not available (e.g. within on_initialize), 0 will be returned.
• RelaychainDataProvider
  Implements [BlockNumberProvider] and RelaychainStateProvider that returns relevant relay data fetched from validation data. NOTE: When validation data is not available (e.g. within on_initialize), default values will be returned.

Traits

• CheckAssociatedRelayNumber
  Something that can check the associated relay block number.
• CheckInherentsDeprecated
  Something that can check the inherents of a block.
• OnSystemEvent
  Something that should be informed about system related events.
• RelaychainStateProvider
  This exposes the RelayChainState to other runtime modules.