121 lines
3.0 KiB
Rust
121 lines
3.0 KiB
Rust
// xfail-fast
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// An example of the bank protocol from eholk's blog post.
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//
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// http://theincredibleholk.wordpress.com/2012/07/06/rusty-pipes/
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use core::pipes;
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use core::pipes::try_recv;
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pub type username = ~str;
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pub type password = ~str;
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pub type money = float;
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pub type amount = float;
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proto! bank (
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login:send {
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login(::username, ::password) -> login_response
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}
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login_response:recv {
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ok -> connected,
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invalid -> login
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}
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connected:send {
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deposit(::money) -> connected,
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withdrawal(::amount) -> withdrawal_response
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}
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withdrawal_response:recv {
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money(::money) -> connected,
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insufficient_funds -> connected
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}
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)
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macro_rules! move_it (
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{ $x:expr } => { unsafe { let y = *ptr::addr_of(&($x)); y } }
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)
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fn switch<T:Owned,U>(+endp: pipes::RecvPacket<T>,
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f: &fn(+v: Option<T>) -> U) -> U {
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f(pipes::try_recv(endp))
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}
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fn move_it<T>(+x: T) -> T { x }
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macro_rules! follow (
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{
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$($message:path$(($($x: ident),+))||* -> $next:ident $e:expr)+
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} => (
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|m| match m {
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$(Some($message($($($x,)+)* next)) => {
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let $next = move_it!(next);
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$e })+
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_ => { fail!() }
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}
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);
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)
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fn client_follow(+bank: bank::client::login) {
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use bank::*;
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let bank = client::login(bank, ~"theincredibleholk", ~"1234");
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let bank = switch(bank, follow! (
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ok -> connected { connected }
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invalid -> _next { fail!(~"bank closed the connected") }
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));
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let bank = client::deposit(bank, 100.00);
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let bank = client::withdrawal(bank, 50.00);
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switch(bank, follow! (
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money(m) -> _next {
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io::println(~"Yay! I got money!");
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}
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insufficient_funds -> _next {
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fail!(~"someone stole my money")
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}
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));
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}
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fn bank_client(+bank: bank::client::login) {
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use bank::*;
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let bank = client::login(bank, ~"theincredibleholk", ~"1234");
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let bank = match try_recv(bank) {
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Some(ok(connected)) => {
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move_it!(connected)
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}
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Some(invalid(_)) => { fail!(~"login unsuccessful") }
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None => { fail!(~"bank closed the connection") }
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};
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let bank = client::deposit(bank, 100.00);
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let bank = client::withdrawal(bank, 50.00);
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match try_recv(bank) {
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Some(money(*)) => {
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io::println(~"Yay! I got money!");
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}
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Some(insufficient_funds(_)) => {
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fail!(~"someone stole my money")
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}
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None => {
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fail!(~"bank closed the connection")
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}
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}
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}
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pub fn main() {
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}
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