97 lines
3.1 KiB
Rust
97 lines
3.1 KiB
Rust
//! Vote program
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//! Receive and processes votes from validators
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use crate::native_program::ProgramError;
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use crate::pubkey::Pubkey;
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use bincode::{deserialize, serialize, serialized_size};
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use byteorder::{ByteOrder, LittleEndian};
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use std::collections::VecDeque;
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pub const VOTE_PROGRAM_ID: [u8; 32] = [
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132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0,
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];
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pub fn check_id(program_id: &Pubkey) -> bool {
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program_id.as_ref() == VOTE_PROGRAM_ID
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}
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pub fn id() -> Pubkey {
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Pubkey::new(&VOTE_PROGRAM_ID)
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}
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// Maximum number of votes to keep around
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pub const MAX_VOTE_HISTORY: usize = 32;
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#[derive(Serialize, Default, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub struct Vote {
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// TODO: add signature of the state here as well
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/// A vote for height tick_height
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pub tick_height: u64,
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum VoteInstruction {
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/// Register a new "vote account" to represent a particular validator in the Vote Contract,
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/// and initialize the VoteState for this "vote account"
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/// * Transaction::keys[0] - the validator id
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/// * Transaction::keys[1] - the new "vote account" to be associated with the validator
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/// identified by keys[0] for voting
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RegisterAccount,
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NewVote(Vote),
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}
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#[derive(Debug, Default, Serialize, Deserialize, PartialEq, Eq)]
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pub struct VoteProgram {
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pub votes: VecDeque<Vote>,
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pub node_id: Pubkey,
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}
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pub fn get_max_size() -> usize {
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// Upper limit on the size of the Vote State. Equal to
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// sizeof(VoteProgram) when votes.len() is MAX_VOTE_HISTORY
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// + 2 (2 bytes for the size)
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let mut vote_program = VoteProgram::default();
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vote_program.votes = VecDeque::from(vec![Vote::default(); MAX_VOTE_HISTORY]);
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serialized_size(&vote_program).unwrap() as usize + 2
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}
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impl VoteProgram {
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pub fn deserialize(input: &[u8]) -> Result<VoteProgram, ProgramError> {
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let len = LittleEndian::read_u16(&input[0..2]) as usize;
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if len == 0 || input.len() < len + 2 {
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Err(ProgramError::InvalidUserdata)
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} else {
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deserialize(&input[2..=len + 1]).map_err(|_| ProgramError::InvalidUserdata)
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}
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}
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pub fn serialize(self: &VoteProgram, output: &mut [u8]) -> Result<(), ProgramError> {
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let self_serialized = serialize(self).unwrap();
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if output.len() + 2 < self_serialized.len() {
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return Err(ProgramError::UserdataTooSmall);
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}
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let serialized_len = self_serialized.len() as u16;
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LittleEndian::write_u16(&mut output[0..2], serialized_len);
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output[2..=serialized_len as usize + 1].clone_from_slice(&self_serialized);
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_serde() {
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let mut buffer: Vec<u8> = vec![0; get_max_size()];
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let mut vote_program = VoteProgram::default();
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vote_program.votes = (0..MAX_VOTE_HISTORY).map(|_| Vote::default()).collect();
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vote_program.serialize(&mut buffer).unwrap();
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assert_eq!(VoteProgram::deserialize(&buffer).unwrap(), vote_program);
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}
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}
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