2018-02-28 09:07:54 -08:00
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use std::io;
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use accountant::Accountant;
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2018-03-03 21:25:37 -08:00
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use event::{Event, PublicKey, Signature};
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2018-03-04 06:28:51 -08:00
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use std::net::UdpSocket;
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use bincode::{deserialize, serialize};
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2018-02-28 09:07:54 -08:00
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pub struct AccountantSkel {
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pub obj: Accountant,
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}
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2018-02-28 13:16:50 -08:00
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#[derive(Serialize, Deserialize, Debug)]
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2018-02-28 09:07:54 -08:00
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pub enum Request {
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Transfer {
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from: PublicKey,
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to: PublicKey,
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val: u64,
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sig: Signature,
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},
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GetBalance {
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key: PublicKey,
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},
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2018-03-01 11:23:27 -08:00
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Wait {
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sig: Signature,
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},
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2018-02-28 09:07:54 -08:00
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}
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2018-02-28 13:16:50 -08:00
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#[derive(Serialize, Deserialize, Debug)]
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2018-02-28 09:07:54 -08:00
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pub enum Response {
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Balance { key: PublicKey, val: u64 },
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2018-03-01 11:23:27 -08:00
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Confirmed { sig: Signature },
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2018-02-28 09:07:54 -08:00
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}
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impl AccountantSkel {
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2018-02-28 13:16:50 -08:00
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pub fn new(obj: Accountant) -> Self {
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AccountantSkel { obj }
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}
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2018-02-28 17:04:35 -08:00
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pub fn process_request(self: &mut Self, msg: Request) -> Option<Response> {
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2018-02-28 09:07:54 -08:00
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match msg {
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Request::Transfer { from, to, val, sig } => {
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2018-03-03 21:25:37 -08:00
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let event = Event::Transaction {
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from,
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to,
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data: val,
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sig,
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};
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if let Err(err) = self.obj.process_event(event) {
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2018-03-03 09:23:31 -08:00
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println!("Transfer error: {:?}", err);
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}
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2018-02-28 09:07:54 -08:00
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None
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}
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Request::GetBalance { key } => {
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let val = self.obj.get_balance(&key).unwrap();
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Some(Response::Balance { key, val })
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}
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2018-03-05 09:45:11 -08:00
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Request::Wait { sig } => Some(Response::Confirmed { sig }),
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2018-02-28 09:07:54 -08:00
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}
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}
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2018-03-01 11:23:27 -08:00
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/// UDP Server that forwards messages to Accountant methods.
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2018-02-28 09:07:54 -08:00
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pub fn serve(self: &mut Self, addr: &str) -> io::Result<()> {
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2018-03-01 11:23:27 -08:00
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let socket = UdpSocket::bind(addr)?;
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2018-02-28 13:16:50 -08:00
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let mut buf = vec![0u8; 1024];
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2018-02-28 09:07:54 -08:00
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loop {
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2018-03-01 11:23:27 -08:00
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//println!("skel: Waiting for incoming packets...");
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let (_sz, src) = socket.recv_from(&mut buf)?;
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2018-02-28 09:07:54 -08:00
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// TODO: Return a descriptive error message if deserialization fails.
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2018-02-28 13:16:50 -08:00
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let req = deserialize(&buf).expect("deserialize request");
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2018-02-28 17:04:35 -08:00
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if let Some(resp) = self.process_request(req) {
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2018-03-01 11:23:27 -08:00
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socket.send_to(&serialize(&resp).expect("serialize response"), &src)?;
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2018-02-28 09:07:54 -08:00
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}
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}
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}
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}
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