Ankan
e504c41a5a
This is the first PR in preparation for https://github.com/paritytech/polkadot-sdk/issues/454. ## Follow ups: - https://github.com/paritytech/polkadot-sdk/pull/3904. - https://github.com/paritytech/polkadot-sdk/pull/3905. Overall changes are documented here (lot more visual 😍): https://hackmd.io/@ak0n/454-np-governance [Maybe followup](https://github.com/paritytech/polkadot-sdk/issues/4217) with migration of storage item `VirtualStakers` as a bool or enum in `Ledger`. ## Context We want to achieve a way for a user (`Delegator`) to delegate their funds to another account (`Agent`). Delegate implies the funds are locked in delegator account itself. Agent can act on behalf of delegator to stake directly on Staking pallet. The delegation feature is added to Staking via another pallet `delegated-staking` worked on [here](https://github.com/paritytech/polkadot-sdk/pull/3904). ## Introduces: ### StakingUnchecked Trait As the name implies, this trait allows unchecked (non-locked) mutation of staking ledger. These apis are only meant to be used by other pallets in the runtime and should not be exposed directly to user code path. Also related: https://github.com/paritytech/polkadot-sdk/issues/3888. ### Virtual Bond Allows other pallets to stake via staking pallet while managing the locks on these accounts themselves. Introduces another storage `VirtualStakers` that whitelist these accounts. We also restrict virtual stakers to set reward account as themselves. Since the account has no locks, we cannot support compounding of rewards. Conservatively, we require them to set a separate account different from the staker. Since these are code managed, it should be easy for another pallet to redistribute reward and rebond them. ### Slashes Since there is no actual lock maintained by staking-pallet for virtual stakers, this pallet does not apply any slashes. It is then important for pallets managing virtual stakers to listen to slashing events and apply necessary slashes.
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