bicoro 0.8.1

Bidirectional co-routine data structures
Documentation

(Bi)directional (Coro)utines

This is a simple pure library to model a bidirectional coroutine in rust. This allows a coroutine to be defined abstracted away from the actual IO implementations.

The main motivation is writing unit testable coroutines, that respond to inputs, and generate outputs. This is a more generic form of Future.

Example

use bicoro::*;
use bicoro::iterator::*;
use ::do_notation::m;
 
// The coroutine in dot-notation
let co : Coroutine<i32,String,()> =
        m! {
            value_1 <- receive();
            value_2 <- receive();
            let sum = i32::wrapping_add(value_1,value_2);
            let output = sum.to_string();
            send(output);
            result(())
        };
 
// Arrange inputs and an store outputs in a vec
let inputs = vec![1,2];

// creates an interator of outputs, fed via the inputs
let mut it = as_iterator(co,inputs.into_iter());

// By ref so we don't consume the iterator (important if
// we want to get the remaining inputs or coroutine)
let outputs = it.by_ref().collect::<Vec<_>>();
// Verify output values
assert_eq!(outputs, vec!["3"]); 

// Consume the iterator, so that we can check results
let (result,mut remaining_inputs) = it.finish();
// We return the result from the coroutine.
assert!(matches!(result,Result::Ok(())));
// All the inputs from the iterator were consumed
assert!(matches!(remaining_inputs.next(),None));

Executing

The coroutine just describes what to do, it won't actually do anything. You need to run it through an executor. One that works on an iterator is provided, but you may also want to create your own to implement with different contexts.

do-notatation

Implementation is compatible with https://github.com/phaazon/do-notation allowing for a syntax 'similar in feel' to using .await on futures.

This helps a bit with the callback hell, but is not strictly necessary.