Diet RPC Node

Introduction

The diet client has to request specific shreds and block headers from the full nodes, in order to do that we have to implement a RPC node that can communicate with the light client using the JSON RPC API.

We added two new methods to the RPC node:

Get block headers method get_block_headers

Returns the requested block header by the slot number and block configuration

Input params:

• Slot
• RpcBlockConfig

Output:

• BlockHeader

Block Header type

pub struct BlockHeader {
    pub vote_signature: Vec<Option<String>>,
    pub validator_identity: Vec<Option<Pubkey>>,
    pub validator_stake: Vec<Option<u64>>,
}

Get shreds method get_shreds

Returns the requested shreds upon call filtered by the slot number and indices

Input params:

• Slot
• Shred Indices

Request:

curl http://localhost:8899 -X POST -H "Content-Type: application/json" -d '
  {"jsonrpc": "2.0","id":1,"method":"getShreds","params":[1,[0,1,2] ]}
'

Output:

• Vec<Option<Shred>>

Steps to build and run the RPC node

git clone https://github.com/tinydancer-io/diet-rpc-validator.git

cargo build --release

/target/release/solana-test-validator