Exercise 10

Objectives: RPC pallet interface

Needs: Exercise 03

Content: We are going to expose an RPC API for the banishment pallet.

Add an RPC call that, given a block number, returns the list of banished accounts at that moment.

Most probably you will have to enrich Runtime API by extending impl_runtime_apis! in bin/runtime/src/lib.rs with a function returning banished accounts.

Hint

You can start by copying RPC code structure from e.g. https://github.com/paritytech/substrate/tree/master/frame/transaction-payment/rpc and modify it to meet your needs.

References:

• bin/node/src/aleph_node_rpc.rs

• query_info call from TransactionPaymentApi (https://github.com/paritytech/substrate/tree/master/frame/transaction-payment/rpc)

• https://hackmd.io/@d9WGfolYQmSRBmnxyOQmAg/BkEANECJs