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Struct pallet_elections_phragmen::migrations::unlock_and_unreserve_all_funds::UnlockAndUnreserveAllFunds

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pub struct UnlockAndUnreserveAllFunds<T: UnlockConfig>(/* private fields */);
Expand description

A migration that unreserves all deposit and unlocks all stake held in the context of this pallet.

Useful to prevent funds from being locked up when the pallet is being deprecated.

The pallet should be made inoperable before this migration is run.

(See also [RemovePallet][frame_support::migrations::RemovePallet])

Trait Implementations§

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impl<T: UnlockConfig> OnRuntimeUpgrade for UnlockAndUnreserveAllFunds<T>
where <<T as UnlockConfig>::Currency as Currency<<T as UnlockConfig>::AccountId>>::Balance: Sum,

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fn pre_upgrade() -> Result<Vec<u8>, TryRuntimeError>

Collects pre-migration data useful for validating the migration was successful, and also checks the integrity of deposited and reserved balances.

Steps:

  1. Gets the deposited and staked balances for each account stored in this pallet.
  2. Collects actual pre-migration locked and reserved balances for each account.
  3. Checks the integrity of the deposited and reserved balances.
  4. Prints summary statistics about the state to be migrated.
  5. Encodes and returns pre-migration data to be used in post_upgrade.

Fails with a TryRuntimeError if there’s a discrepancy between the amount reported as staked by the pallet and the amount actually locked in Balances.

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fn on_runtime_upgrade() -> Weight

Executes the migration.

Steps:

  1. Retrieves the deposit and stake amounts from the pallet.
  2. Unreserves the deposited funds for each account.
  3. Unlocks the staked funds for each account.
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fn post_upgrade( account_reserved_before_bytes: Vec<u8>, ) -> Result<(), TryRuntimeError>

Performs post-upgrade sanity checks:

  1. All expected locks were removed after the migration.
  2. The reserved balance for each account has been reduced by the expected amount.
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fn try_on_runtime_upgrade(checks: bool) -> Result<Weight, DispatchError>

The expected and default behavior of this method is to handle executing pre_upgrade -> on_runtime_upgrade -> post_upgrade hooks for a migration. Read more

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