109 lines
2.5 KiB
Rust
109 lines
2.5 KiB
Rust
// xfail-pretty
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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 pipes::try_recv;
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type username = ~str;
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type password = ~str;
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type money = float;
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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: send, U>(+endp: pipes::RecvPacket<T>,
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f: fn(+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 $e:expr)+
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} => (
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|m| match move m {
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$(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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import 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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import 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(m, _)) => {
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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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fn main() {
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}
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