73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
|
use std::io;
|
||
|
|
use accountant::Accountant;
|
||
|
|
use log::{PublicKey, Signature};
|
||
|
|
//use serde::Serialize;
|
||
|
|
|
||
|
|
pub struct AccountantSkel {
|
||
|
|
pub obj: Accountant,
|
||
|
|
}
|
||
|
|
|
||
|
|
#[derive(Serialize, Deserialize)]
|
||
|
|
pub enum Request {
|
||
|
|
Deposit {
|
||
|
|
key: PublicKey,
|
||
|
|
val: u64,
|
||
|
|
sig: Signature,
|
||
|
|
},
|
||
|
|
Transfer {
|
||
|
|
from: PublicKey,
|
||
|
|
to: PublicKey,
|
||
|
|
val: u64,
|
||
|
|
sig: Signature,
|
||
|
|
},
|
||
|
|
GetBalance {
|
||
|
|
key: PublicKey,
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
#[derive(Serialize, Deserialize)]
|
||
|
|
pub enum Response {
|
||
|
|
Balance { key: PublicKey, val: u64 },
|
||
|
|
}
|
||
|
|
|
||
|
|
impl AccountantSkel {
|
||
|
|
pub fn process_message(self: &mut Self, msg: Request) -> Option<Response> {
|
||
|
|
match msg {
|
||
|
|
Request::Deposit { key, val, sig } => {
|
||
|
|
let _ = self.obj.deposit_signed(key, val, sig);
|
||
|
|
None
|
||
|
|
}
|
||
|
|
Request::Transfer { from, to, val, sig } => {
|
||
|
|
let _ = self.obj.transfer_signed(from, to, val, sig);
|
||
|
|
None
|
||
|
|
}
|
||
|
|
Request::GetBalance { key } => {
|
||
|
|
let val = self.obj.get_balance(&key).unwrap();
|
||
|
|
Some(Response::Balance { key, val })
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// TCP Server that forwards messages to Accountant methods.
|
||
|
|
pub fn serve(self: &mut Self, addr: &str) -> io::Result<()> {
|
||
|
|
use std::net::TcpListener;
|
||
|
|
use std::io::{Read, Write};
|
||
|
|
use bincode::{deserialize, serialize};
|
||
|
|
let listener = TcpListener::bind(addr)?;
|
||
|
|
let mut buf = vec![];
|
||
|
|
loop {
|
||
|
|
let (mut stream, addr) = listener.accept()?;
|
||
|
|
println!("connection received from {}", addr);
|
||
|
|
|
||
|
|
// TODO: Guard against large message DoS attack.
|
||
|
|
stream.read_to_end(&mut buf)?;
|
||
|
|
|
||
|
|
// TODO: Return a descriptive error message if deserialization fails.
|
||
|
|
let msg = deserialize(&buf).unwrap();
|
||
|
|
if let Some(resp) = self.process_message(msg) {
|
||
|
|
stream.write(&serialize(&resp).unwrap())?;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|