297 lines
10 KiB
Rust
297 lines
10 KiB
Rust
//! The `thin_client` module is a client-side object that interfaces with
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//! a server-side TPU. Client code should use this object instead of writing
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//! messages to the network directly. The binary encoding of its messages are
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//! unstable and may change in future releases.
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use bincode::{deserialize, serialize};
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use futures::future::{ok, FutureResult};
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use hash::Hash;
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use request::{Request, Response};
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use signature::{KeyPair, PublicKey, Signature};
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use std::collections::HashMap;
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use std::io;
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use std::net::{SocketAddr, UdpSocket};
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use transaction::Transaction;
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pub struct ThinClient {
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requests_addr: SocketAddr,
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requests_socket: UdpSocket,
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transactions_addr: SocketAddr,
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transactions_socket: UdpSocket,
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last_id: Option<Hash>,
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transaction_count: u64,
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balances: HashMap<PublicKey, Option<i64>>,
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}
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impl ThinClient {
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/// Create a new ThinClient that will interface with Rpu
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/// over `requests_socket` and `transactions_socket`. To receive responses, the caller must bind `socket`
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/// to a public address before invoking ThinClient methods.
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pub fn new(
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requests_addr: SocketAddr,
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requests_socket: UdpSocket,
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transactions_addr: SocketAddr,
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transactions_socket: UdpSocket,
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) -> Self {
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let client = ThinClient {
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requests_addr,
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requests_socket,
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transactions_addr,
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transactions_socket,
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last_id: None,
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transaction_count: 0,
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balances: HashMap::new(),
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};
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client
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}
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pub fn recv_response(&self) -> io::Result<Response> {
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let mut buf = vec![0u8; 1024];
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trace!("start recv_from");
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self.requests_socket.recv_from(&mut buf)?;
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trace!("end recv_from");
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let resp = deserialize(&buf).expect("deserialize balance in thin_client");
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Ok(resp)
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}
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pub fn process_response(&mut self, resp: Response) {
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match resp {
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Response::Balance { key, val } => {
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trace!("Response balance {:?} {:?}", key, val);
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self.balances.insert(key, val);
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}
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Response::LastId { id } => {
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info!("Response last_id {:?}", id);
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self.last_id = Some(id);
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}
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Response::TransactionCount { transaction_count } => {
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info!("Response transaction count {:?}", transaction_count);
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self.transaction_count = transaction_count;
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}
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}
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}
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/// Send a signed Transaction to the server for processing. This method
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/// does not wait for a response.
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pub fn transfer_signed(&self, tx: Transaction) -> io::Result<usize> {
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let data = serialize(&tx).expect("serialize Transaction in pub fn transfer_signed");
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self.transactions_socket
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.send_to(&data, &self.transactions_addr)
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}
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/// Creates, signs, and processes a Transaction. Useful for writing unit-tests.
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pub fn transfer(
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&self,
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n: i64,
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keypair: &KeyPair,
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to: PublicKey,
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last_id: &Hash,
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) -> io::Result<Signature> {
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let tx = Transaction::new(keypair, to, n, *last_id);
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let sig = tx.sig;
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self.transfer_signed(tx).map(|_| sig)
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}
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/// Request the balance of the user holding `pubkey`. This method blocks
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/// until the server sends a response. If the response packet is dropped
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/// by the network, this method will hang indefinitely.
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pub fn get_balance(&mut self, pubkey: &PublicKey) -> io::Result<i64> {
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trace!("get_balance");
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let req = Request::GetBalance { key: *pubkey };
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let data = serialize(&req).expect("serialize GetBalance in pub fn get_balance");
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self.requests_socket
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.send_to(&data, &self.requests_addr)
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.expect("buffer error in pub fn get_balance");
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let mut done = false;
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while !done {
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let resp = self.recv_response()?;
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trace!("recv_response {:?}", resp);
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if let &Response::Balance { ref key, .. } = &resp {
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done = key == pubkey;
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}
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self.process_response(resp);
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}
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self.balances[pubkey].ok_or(io::Error::new(io::ErrorKind::Other, "nokey"))
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}
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/// Request the transaction count. If the response packet is dropped by the network,
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/// this method will hang.
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pub fn transaction_count(&mut self) -> u64 {
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info!("transaction_count");
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let req = Request::GetTransactionCount;
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let data =
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serialize(&req).expect("serialize GetTransactionCount in pub fn transaction_count");
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self.requests_socket
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.send_to(&data, &self.requests_addr)
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.expect("buffer error in pub fn transaction_count");
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let mut done = false;
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while !done {
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let resp = self.recv_response().expect("transaction count dropped");
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info!("recv_response {:?}", resp);
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if let &Response::TransactionCount { .. } = &resp {
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done = true;
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}
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self.process_response(resp);
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}
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self.transaction_count
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}
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/// Request the last Entry ID from the server. This method blocks
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/// until the server sends a response.
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pub fn get_last_id(&mut self) -> FutureResult<Hash, ()> {
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info!("get_last_id");
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let req = Request::GetLastId;
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let data = serialize(&req).expect("serialize GetLastId in pub fn get_last_id");
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self.requests_socket
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.send_to(&data, &self.requests_addr)
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.expect("buffer error in pub fn get_last_id");
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let mut done = false;
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while !done {
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let resp = self.recv_response().expect("get_last_id response");
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if let &Response::LastId { .. } = &resp {
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done = true;
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}
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self.process_response(resp);
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}
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ok(self.last_id.expect("some last_id"))
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}
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pub fn poll_get_balance(&mut self, pubkey: &PublicKey) -> io::Result<i64> {
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use std::time::Instant;
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let mut balance;
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let now = Instant::now();
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loop {
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balance = self.get_balance(pubkey);
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if balance.is_ok() || now.elapsed().as_secs() > 1 {
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break;
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}
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}
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balance
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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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use bank::Bank;
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use budget::Budget;
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use crdt::TestNode;
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use futures::Future;
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use logger;
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use mint::Mint;
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use server::Server;
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use signature::{KeyPair, KeyPairUtil};
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use std::io::sink;
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use std::sync::Arc;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::thread::sleep;
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use std::time::Duration;
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use transaction::{Instruction, Plan};
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#[test]
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fn test_thin_client() {
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logger::setup();
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let leader = TestNode::new();
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let alice = Mint::new(10_000);
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let bank = Bank::new(&alice);
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let bob_pubkey = KeyPair::new().pubkey();
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let exit = Arc::new(AtomicBool::new(false));
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let server = Server::new_leader(
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bank,
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alice.last_id(),
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Some(Duration::from_millis(30)),
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leader.data.clone(),
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leader.sockets.requests,
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leader.sockets.transaction,
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leader.sockets.broadcast,
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leader.sockets.respond,
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leader.sockets.gossip,
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exit.clone(),
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sink(),
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);
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sleep(Duration::from_millis(900));
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let requests_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
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let transactions_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
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let mut client = ThinClient::new(
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leader.data.requests_addr,
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requests_socket,
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leader.data.transactions_addr,
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transactions_socket,
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);
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let last_id = client.get_last_id().wait().unwrap();
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let _sig = client
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.transfer(500, &alice.keypair(), bob_pubkey, &last_id)
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.unwrap();
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let balance = client.poll_get_balance(&bob_pubkey);
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assert_eq!(balance.unwrap(), 500);
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exit.store(true, Ordering::Relaxed);
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for t in server.thread_hdls {
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t.join().unwrap();
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}
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}
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#[test]
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fn test_bad_sig() {
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logger::setup();
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let leader = TestNode::new();
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let alice = Mint::new(10_000);
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let bank = Bank::new(&alice);
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let bob_pubkey = KeyPair::new().pubkey();
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let exit = Arc::new(AtomicBool::new(false));
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let server = Server::new_leader(
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bank,
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alice.last_id(),
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Some(Duration::from_millis(30)),
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leader.data.clone(),
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leader.sockets.requests,
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leader.sockets.transaction,
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leader.sockets.broadcast,
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leader.sockets.respond,
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leader.sockets.gossip,
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exit.clone(),
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sink(),
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);
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sleep(Duration::from_millis(300));
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let requests_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
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requests_socket
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.set_read_timeout(Some(Duration::new(5, 0)))
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.unwrap();
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let transactions_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
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let mut client = ThinClient::new(
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leader.data.requests_addr,
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requests_socket,
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leader.data.transactions_addr,
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transactions_socket,
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);
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let last_id = client.get_last_id().wait().unwrap();
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let tx = Transaction::new(&alice.keypair(), bob_pubkey, 500, last_id);
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let _sig = client.transfer_signed(tx).unwrap();
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let last_id = client.get_last_id().wait().unwrap();
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let mut tr2 = Transaction::new(&alice.keypair(), bob_pubkey, 501, last_id);
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if let Instruction::NewContract(contract) = &mut tr2.instruction {
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contract.tokens = 502;
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contract.plan = Plan::Budget(Budget::new_payment(502, bob_pubkey));
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}
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let _sig = client.transfer_signed(tr2).unwrap();
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let balance = client.poll_get_balance(&bob_pubkey);
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assert_eq!(balance.unwrap(), 500);
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exit.store(true, Ordering::Relaxed);
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for t in server.thread_hdls {
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t.join().unwrap();
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}
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}
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}
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