/
relayer.rs
131 lines (122 loc) · 4.18 KB
/
relayer.rs
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use bitcoincore_rpc::{Auth, Client, Error, RpcApi};
use nomic_client::{Client as PegClient, ClientError as PegClientError};
use nomic_primitives::transaction::Transaction;
use std::env;
#[derive(Debug)]
pub enum RelayerState {
InitializeBitcoinRpc,
InitializePegClient,
FetchBestBitcoinBlockHash,
FetchPegBlockHashes,
ComputeCommonAncestor,
FetchLinkingHeaders,
BuildHeaderTransaction,
BroadcastHeaderTransaction,
Failure,
}
#[derive(Debug)]
pub enum RelayerEvent {
InitializeBitcoinRpcSuccess,
InitializeBitcoinRpcFailure,
InitializePegClientSuccess,
InitializePegClientFailure,
FetchBestBitcoinBlockHashSuccess,
FetchBestBitcoinBlockHashFailure,
FetchPegBlockHashesSuccess,
FetchPegBlockHashesFailure,
ComputeCommonAncestorSuccess,
ComputeCommonAncestorFailure,
FetchLinkingHeadersSuccess,
FetchLinkingHeadersFailure,
BuiltHeaderTransaction,
BroadcastHeaderTransactionSuccess,
BroadcastHeaderTransactionFailure,
}
impl RelayerState {
pub fn next(self, event: RelayerEvent) -> Self {
use self::RelayerEvent::*;
use self::RelayerState::*;
match (self, event) {
(InitializeBitcoinRpc, InitializeBitcoinRpcSuccess) => InitializePegClient,
(InitializePegClient, InitializePegClientSuccess) => FetchBestBitcoinBlockHash,
(FetchBestBitcoinBlockHash, FetchBestBitcoinBlockHashSuccess) => FetchPegBlockHashes,
(FetchPegBlockHashes, FetchPegBlockHashesSuccess) => ComputeCommonAncestor,
(FetchPegBlockHashes, FetchPegBlockHashesFailure) => FetchPegBlockHashes,
(ComputeCommonAncestor, ComputeCommonAncestorSuccess) => FetchLinkingHeaders,
(FetchLinkingHeaders, FetchLinkingHeadersSuccess) => BuildHeaderTransaction,
(BuildHeaderTransaction, BuiltHeaderTransaction) => BroadcastHeaderTransaction,
(BroadcastHeaderTransaction, BroadcastHeaderTransactionSuccess) => {
FetchBestBitcoinBlockHash
}
(BroadcastHeaderTransaction, BroadcastHeaderTransactionFailure) => {
BroadcastHeaderTransaction
}
(_, _) => Failure,
}
}
}
pub struct RelayerStateMachine {
pub state: RelayerState,
rpc: Option<Client>,
peg_client: Option<PegClient>,
}
impl RelayerStateMachine {
pub fn new() -> Self {
RelayerStateMachine {
state: RelayerState::InitializeBitcoinRpc,
rpc: None,
peg_client: None,
}
}
pub fn run(&mut self) -> RelayerEvent {
use self::RelayerEvent::*;
use self::RelayerState::*;
match &mut self.state {
InitializeBitcoinRpc => {
let rpc = make_rpc_client();
match rpc {
Ok(rpc) => {
self.rpc = Some(rpc);
InitializeBitcoinRpcSuccess
}
Err(_) => InitializeBitcoinRpcFailure,
}
}
InitializePegClient => {
let peg_client = PegClient::new();
match peg_client {
Ok(peg_client) => {
self.peg_client = Some(peg_client);
InitializePegClientSuccess
}
Err(_) => InitializePegClientFailure,
}
}
_ => panic!("Relayer is in an unhandled state"),
}
}
}
pub fn make_rpc_client() -> Result<Client, Error> {
let rpc_user = env::var("BTC_RPC_USER").unwrap();
let rpc_pass = env::var("BTC_RPC_PASS").unwrap();
let rpc_auth = Auth::UserPass(rpc_user, rpc_pass);
let rpc_url = "http://localhost:18332";
Client::new(rpc_url.to_string(), rpc_auth)
}
fn get_best_hash(rpc: &Client) {
let hash = &rpc.get_best_block_hash().unwrap();
println!("best hash: {}", hash);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn run_relayer_state_machine() {
let mut sm = RelayerStateMachine::new();
for _ in 0..2 {
let event = sm.run();
sm.state = sm.state.next(event);
println!("sm state: {:?}", sm.state);
}
}
}