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57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
# Initializer Pallet
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This module is responsible for initializing the other modules in a deterministic order. It also has one other purpose as
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described in the overview of the runtime: accepting and forwarding session change notifications.
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## Storage
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```rust
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HasInitialized: bool;
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// buffered session changes along with the block number at which they should be applied.
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//
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// typically this will be empty or one element long. ordered ascending by BlockNumber and insertion
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// order.
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BufferedSessionChanges: Vec<(BlockNumber, ValidatorSet, ValidatorSet)>;
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```
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## Initialization
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Before initializing modules, remove all changes from the `BufferedSessionChanges` with number less than or equal to the
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current block number, and apply the last one. The session change is applied to all modules in the same order as
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initialization.
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The other parachains modules are initialized in this order:
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1. Configuration
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1. Shared
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1. Paras
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1. Scheduler
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1. Inclusion
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1. SessionInfo
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1. Disputes
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1. DMP
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1. UMP
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1. HRMP
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The [Configuration Module](configuration.md) is first, since all other modules need to operate under the same
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configuration as each other. Then the [Shared](shared.md) module is invoked, which determines the set of active
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validators. It would lead to inconsistency if, for example, the scheduler ran first and then the configuration was
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updated before the Inclusion module.
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Set `HasInitialized` to true.
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## Session Change
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Store the session change information in `BufferedSessionChange` along with the block number at which it was submitted,
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plus one. Although the expected operational parameters of the block authorship system should prevent more than one
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change from being buffered at any time, it may occur. Regardless, we always need to track the block number at which the
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session change can be applied so as to remain flexible over session change notifications being issued before or after
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initialization of the current block.
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## Finalization
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Finalization order is less important in this case than initialization order, so we finalize the modules in the reverse
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order from initialization.
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Set `HasInitialized` to false.
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