677 lines
23 KiB
Rust
677 lines
23 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 bank::{Account, Bank};
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use bincode::{deserialize, serialize};
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use crdt::{Crdt, CrdtError, NodeInfo};
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use hash::Hash;
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use log::Level;
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use ncp::Ncp;
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use packet::BlobRecycler;
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use request::{Request, Response};
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use result::{Error, Result};
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use signature::{Keypair, Pubkey, Signature};
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use std;
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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 std::sync::atomic::AtomicBool;
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use std::sync::{Arc, RwLock};
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use std::thread::sleep;
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use std::time::Duration;
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use std::time::Instant;
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use timing;
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use transaction::Transaction;
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use influx_db_client as influxdb;
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use metrics;
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/// An object for querying and sending transactions to the network.
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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<Pubkey, Account>,
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signature_status: bool,
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finality: Option<usize>,
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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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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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signature_status: false,
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finality: None,
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}
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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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match self.requests_socket.recv_from(&mut buf) {
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Ok((len, from)) => {
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trace!("end recv_from got {} {}", len, from);
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deserialize(&buf)
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.or_else(|_| Err(io::Error::new(io::ErrorKind::Other, "deserialize")))
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}
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Err(e) => {
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trace!("end recv_from got {:?}", e);
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Err(e)
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}
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}
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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::Account {
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key,
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account: Some(ref account),
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} => {
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trace!("Response account {:?} {:?}", key, account);
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self.balances.insert(key, account.clone());
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}
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Response::Account { key, account: None } => {
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debug!("Response account {}: None ", key);
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self.balances.remove(&key);
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}
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Response::LastId { id } => {
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trace!("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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trace!("Response transaction count {:?}", transaction_count);
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self.transaction_count = transaction_count;
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}
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Response::SignatureStatus { signature_status } => {
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self.signature_status = signature_status;
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if signature_status {
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trace!("Response found signature");
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} else {
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trace!("Response signature not found");
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}
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}
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Response::Finality { time } => {
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trace!("Response finality {:?}", time);
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self.finality = Some(time);
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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<Signature> {
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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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Ok(tx.signature)
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}
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/// Retry a sending a signed Transaction to the server for processing.
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pub fn retry_transfer_signed(
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&mut self,
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tx: &Transaction,
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tries: usize,
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) -> io::Result<Signature> {
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let data = serialize(&tx).expect("serialize Transaction in pub fn transfer_signed");
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for x in 0..tries {
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self.transactions_socket
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.send_to(&data, &self.transactions_addr)?;
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if self.poll_for_signature(&tx.signature).is_ok() {
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return Ok(tx.signature);
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}
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info!("{} tries failed transfer to {}", x, self.transactions_addr);
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}
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Err(io::Error::new(
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io::ErrorKind::Other,
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"retry_transfer_signed failed",
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))
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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: Pubkey,
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last_id: &Hash,
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) -> io::Result<Signature> {
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let now = Instant::now();
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let tx = Transaction::new(keypair, to, n, *last_id);
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let result = self.transfer_signed(&tx);
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metrics::submit(
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influxdb::Point::new("thinclient")
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.add_tag("op", influxdb::Value::String("transfer".to_string()))
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.add_field(
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"duration_ms",
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influxdb::Value::Integer(timing::duration_as_ms(&now.elapsed()) as i64),
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).to_owned(),
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);
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result
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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: &Pubkey) -> io::Result<i64> {
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trace!("get_balance sending request to {}", self.requests_addr);
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let req = Request::GetAccount { key: *pubkey };
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let data = serialize(&req).expect("serialize GetAccount 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::Account { 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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trace!("get_balance {:?}", self.balances.get(pubkey));
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// TODO: This is a hard coded call to introspect the balance of a budget_dsl contract
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// In the future custom contracts would need their own introspection
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self.balances
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.get(pubkey)
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.map(Bank::read_balance)
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.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "nokey"))
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}
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/// Request the finality from the leader node
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pub fn get_finality(&mut self) -> usize {
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trace!("get_finality");
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let req = Request::GetFinality;
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let data = serialize(&req).expect("serialize GetFinality in pub fn get_finality");
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let mut done = false;
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while !done {
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debug!("get_finality send_to {}", &self.requests_addr);
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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_finality");
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match self.recv_response() {
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Ok(resp) => {
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if let Response::Finality { .. } = 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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Err(e) => {
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debug!("thin_client get_finality error: {}", e);
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}
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}
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}
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self.finality.expect("some finality")
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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 try again 5 times.
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pub fn transaction_count(&mut self) -> u64 {
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debug!("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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let mut tries_left = 5;
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while tries_left > 0 {
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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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if let Ok(resp) = self.recv_response() {
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debug!("transaction_count recv_response: {:?}", resp);
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if let Response::TransactionCount { .. } = resp {
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tries_left = 0;
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}
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self.process_response(&resp);
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} else {
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tries_left -= 1;
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}
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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) -> Hash {
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trace!("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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let mut done = false;
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while !done {
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debug!("get_last_id send_to {}", &self.requests_addr);
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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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match self.recv_response() {
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Ok(resp) => {
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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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Err(e) => {
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debug!("thin_client get_last_id error: {}", e);
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}
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}
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}
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self.last_id.expect("some last_id")
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}
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pub fn submit_poll_balance_metrics(elapsed: &Duration) {
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metrics::submit(
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influxdb::Point::new("thinclient")
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.add_tag("op", influxdb::Value::String("get_balance".to_string()))
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.add_field(
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"duration_ms",
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influxdb::Value::Integer(timing::duration_as_ms(elapsed) as i64),
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).to_owned(),
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);
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}
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pub fn poll_balance_with_timeout(
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&mut self,
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pubkey: &Pubkey,
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polling_frequency: &Duration,
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timeout: &Duration,
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) -> io::Result<i64> {
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let now = Instant::now();
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loop {
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match self.get_balance(&pubkey) {
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Ok(bal) => {
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ThinClient::submit_poll_balance_metrics(&now.elapsed());
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return Ok(bal);
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}
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Err(e) => {
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sleep(*polling_frequency);
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if now.elapsed() > *timeout {
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ThinClient::submit_poll_balance_metrics(&now.elapsed());
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return Err(e);
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}
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}
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};
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}
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}
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pub fn poll_get_balance(&mut self, pubkey: &Pubkey) -> io::Result<i64> {
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self.poll_balance_with_timeout(pubkey, &Duration::from_millis(100), &Duration::from_secs(1))
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}
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/// Poll the server to confirm a transaction.
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pub fn poll_for_signature(&mut self, signature: &Signature) -> io::Result<()> {
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let now = Instant::now();
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while !self.check_signature(signature) {
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if now.elapsed().as_secs() > 1 {
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// TODO: Return a better error.
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return Err(io::Error::new(io::ErrorKind::Other, "signature not found"));
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}
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sleep(Duration::from_millis(100));
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}
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Ok(())
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}
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/// Check a signature in the bank. This method blocks
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/// until the server sends a response.
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pub fn check_signature(&mut self, signature: &Signature) -> bool {
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trace!("check_signature");
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let req = Request::GetSignature {
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signature: *signature,
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};
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let data = serialize(&req).expect("serialize GetSignature in pub fn check_signature");
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let now = Instant::now();
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let mut done = false;
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while !done {
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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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if let Ok(resp) = self.recv_response() {
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if let Response::SignatureStatus { .. } = 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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}
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metrics::submit(
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influxdb::Point::new("thinclient")
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.add_tag("op", influxdb::Value::String("check_signature".to_string()))
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.add_field(
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"duration_ms",
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influxdb::Value::Integer(timing::duration_as_ms(&now.elapsed()) as i64),
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).to_owned(),
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);
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self.signature_status
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}
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}
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impl Drop for ThinClient {
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fn drop(&mut self) {
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metrics::flush();
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}
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}
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pub fn poll_gossip_for_leader(leader_ncp: SocketAddr, timeout: Option<u64>) -> Result<NodeInfo> {
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let exit = Arc::new(AtomicBool::new(false));
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let (node, gossip_socket) = Crdt::spy_node();
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let my_addr = gossip_socket.local_addr().unwrap();
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let crdt = Arc::new(RwLock::new(Crdt::new(node).expect("Crdt::new")));
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let window = Arc::new(RwLock::new(vec![]));
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let ncp = Ncp::new(
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&crdt.clone(),
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window,
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BlobRecycler::default(),
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None,
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gossip_socket,
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exit.clone(),
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);
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let leader_entry_point = NodeInfo::new_entry_point(&leader_ncp);
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crdt.write().unwrap().insert(&leader_entry_point);
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sleep(Duration::from_millis(100));
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let deadline = match timeout {
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Some(timeout) => Duration::new(timeout, 0),
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None => Duration::new(std::u64::MAX, 0),
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};
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let now = Instant::now();
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// Block until leader's correct contact info is received
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let leader;
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loop {
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trace!("polling {:?} for leader from {:?}", leader_ncp, my_addr);
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if let Some(l) = crdt.read().unwrap().leader_data() {
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leader = Some(l.clone());
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break;
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}
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if log_enabled!(Level::Trace) {
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trace!("{}", crdt.read().unwrap().node_info_trace());
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}
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if now.elapsed() > deadline {
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return Err(Error::CrdtError(CrdtError::NoLeader));
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}
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sleep(Duration::from_millis(100));
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}
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ncp.close()?;
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if log_enabled!(Level::Trace) {
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trace!("{}", crdt.read().unwrap().node_info_trace());
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}
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Ok(leader.unwrap().clone())
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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 crdt::Node;
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use fullnode::Fullnode;
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use ledger::LedgerWriter;
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use logger;
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use mint::Mint;
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use signature::{Keypair, KeypairUtil};
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use std::fs::remove_dir_all;
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use system_contract::SystemContract;
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fn tmp_ledger(name: &str, mint: &Mint) -> String {
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use std::env;
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let out_dir = env::var("OUT_DIR").unwrap_or_else(|_| "target".to_string());
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let keypair = Keypair::new();
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let path = format!("{}/tmp-ledger-{}-{}", out_dir, name, keypair.pubkey());
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let mut writer = LedgerWriter::open(&path, true).unwrap();
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writer.write_entries(mint.create_entries()).unwrap();
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path
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}
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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_keypair = Keypair::new();
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let leader = Node::new_localhost_with_pubkey(leader_keypair.pubkey());
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let leader_data = leader.info.clone();
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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 ledger_path = tmp_ledger("thin_client", &alice);
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let server = Fullnode::new_with_bank(
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leader_keypair,
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bank,
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0,
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&[],
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leader,
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None,
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Some(&ledger_path),
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false,
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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.contact_info.rpu,
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requests_socket,
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leader_data.contact_info.tpu,
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transactions_socket,
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);
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let last_id = client.get_last_id();
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let signature = client
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.transfer(500, &alice.keypair(), bob_pubkey, &last_id)
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.unwrap();
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client.poll_for_signature(&signature).unwrap();
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let balance = client.get_balance(&bob_pubkey);
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assert_eq!(balance.unwrap(), 500);
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server.close().unwrap();
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remove_dir_all(ledger_path).unwrap();
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}
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// sleep(Duration::from_millis(300)); is unstable
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#[test]
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#[ignore]
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fn test_bad_sig() {
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logger::setup();
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let leader_keypair = Keypair::new();
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let leader = Node::new_localhost_with_pubkey(leader_keypair.pubkey());
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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 leader_data = leader.info.clone();
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let ledger_path = tmp_ledger("bad_sig", &alice);
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let server = Fullnode::new_with_bank(
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leader_keypair,
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bank,
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0,
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&[],
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leader,
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None,
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Some(&ledger_path),
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false,
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);
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//TODO: remove this sleep, or add a retry so CI is stable
|
|
sleep(Duration::from_millis(300));
|
|
|
|
let requests_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
requests_socket
|
|
.set_read_timeout(Some(Duration::new(5, 0)))
|
|
.unwrap();
|
|
let transactions_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
let mut client = ThinClient::new(
|
|
leader_data.contact_info.rpu,
|
|
requests_socket,
|
|
leader_data.contact_info.tpu,
|
|
transactions_socket,
|
|
);
|
|
let last_id = client.get_last_id();
|
|
|
|
let tx = Transaction::new(&alice.keypair(), bob_pubkey, 500, last_id);
|
|
|
|
let _sig = client.transfer_signed(&tx).unwrap();
|
|
|
|
let last_id = client.get_last_id();
|
|
|
|
let mut tr2 = Transaction::new(&alice.keypair(), bob_pubkey, 501, last_id);
|
|
let mut instruction2 = deserialize(&tr2.userdata).unwrap();
|
|
if let SystemContract::Move { ref mut tokens } = instruction2 {
|
|
*tokens = 502;
|
|
}
|
|
tr2.userdata = serialize(&instruction2).unwrap();
|
|
let signature = client.transfer_signed(&tr2).unwrap();
|
|
client.poll_for_signature(&signature).unwrap();
|
|
|
|
let balance = client.get_balance(&bob_pubkey);
|
|
assert_eq!(balance.unwrap(), 500);
|
|
server.close().unwrap();
|
|
remove_dir_all(ledger_path).unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn test_client_check_signature() {
|
|
logger::setup();
|
|
let leader_keypair = Keypair::new();
|
|
let leader = Node::new_localhost_with_pubkey(leader_keypair.pubkey());
|
|
let alice = Mint::new(10_000);
|
|
let bank = Bank::new(&alice);
|
|
let bob_pubkey = Keypair::new().pubkey();
|
|
let leader_data = leader.info.clone();
|
|
let ledger_path = tmp_ledger("client_check_signature", &alice);
|
|
|
|
let server = Fullnode::new_with_bank(
|
|
leader_keypair,
|
|
bank,
|
|
0,
|
|
&[],
|
|
leader,
|
|
None,
|
|
Some(&ledger_path),
|
|
false,
|
|
);
|
|
sleep(Duration::from_millis(300));
|
|
|
|
let requests_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
requests_socket
|
|
.set_read_timeout(Some(Duration::new(5, 0)))
|
|
.unwrap();
|
|
let transactions_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
let mut client = ThinClient::new(
|
|
leader_data.contact_info.rpu,
|
|
requests_socket,
|
|
leader_data.contact_info.tpu,
|
|
transactions_socket,
|
|
);
|
|
let last_id = client.get_last_id();
|
|
let signature = client
|
|
.transfer(500, &alice.keypair(), bob_pubkey, &last_id)
|
|
.unwrap();
|
|
|
|
assert!(client.poll_for_signature(&signature).is_ok());
|
|
|
|
server.close().unwrap();
|
|
remove_dir_all(ledger_path).unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn test_transaction_count() {
|
|
// set a bogus address, see that we don't hang
|
|
logger::setup();
|
|
let addr = "0.0.0.0:1234".parse().unwrap();
|
|
let requests_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
requests_socket
|
|
.set_read_timeout(Some(Duration::from_millis(250)))
|
|
.unwrap();
|
|
let transactions_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
let mut client = ThinClient::new(addr, requests_socket, addr, transactions_socket);
|
|
assert_eq!(client.transaction_count(), 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_zero_balance_after_nonzero() {
|
|
logger::setup();
|
|
let leader_keypair = Keypair::new();
|
|
let leader = Node::new_localhost_with_pubkey(leader_keypair.pubkey());
|
|
let alice = Mint::new(10_000);
|
|
let bank = Bank::new(&alice);
|
|
let bob_keypair = Keypair::new();
|
|
let leader_data = leader.info.clone();
|
|
let ledger_path = tmp_ledger("zero_balance_check", &alice);
|
|
|
|
let server = Fullnode::new_with_bank(
|
|
leader_keypair,
|
|
bank,
|
|
0,
|
|
&[],
|
|
leader,
|
|
None,
|
|
Some(&ledger_path),
|
|
false,
|
|
);
|
|
sleep(Duration::from_millis(900));
|
|
|
|
let requests_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
requests_socket
|
|
.set_read_timeout(Some(Duration::new(5, 0)))
|
|
.unwrap();
|
|
let transactions_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
|
|
let mut client = ThinClient::new(
|
|
leader_data.contact_info.rpu,
|
|
requests_socket,
|
|
leader_data.contact_info.tpu,
|
|
transactions_socket,
|
|
);
|
|
let last_id = client.get_last_id();
|
|
|
|
// give bob 500 tokens
|
|
let signature = client
|
|
.transfer(500, &alice.keypair(), bob_keypair.pubkey(), &last_id)
|
|
.unwrap();
|
|
assert!(client.poll_for_signature(&signature).is_ok());
|
|
|
|
let balance = client.poll_get_balance(&bob_keypair.pubkey());
|
|
assert!(balance.is_ok());
|
|
assert_eq!(balance.unwrap(), 500);
|
|
|
|
// take them away
|
|
let signature = client
|
|
.transfer(500, &bob_keypair, alice.keypair().pubkey(), &last_id)
|
|
.unwrap();
|
|
assert!(client.poll_for_signature(&signature).is_ok());
|
|
|
|
// should get an error when bob's account is purged
|
|
let balance = client.poll_get_balance(&bob_keypair.pubkey());
|
|
assert!(balance.is_err());
|
|
|
|
server.close().unwrap();
|
|
remove_dir_all(ledger_path).unwrap();
|
|
}
|
|
}
|