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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>From Generators to Sagas</title>
<meta name="author" content="Ian Metcalf">
<link rel="stylesheet" href="lib/css/reveal.css">
<link rel="stylesheet" href="css/theme.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'lib/css/pdf.css' : 'lib/css/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<h1>From Generators to Sagas</h1>
<p>
<small>ian metcalf</small>
</p>
</section>
<section>
<section>
<h3>ES6 Refresher</h3>
</section>
<section>
<h3>Arrow Functions</h3>
<klipse-snippet>
const fn = (param) => {
console.log(param);
};
fn('hi');
[1,2,3].map(n => n + 2).filter(n => n % 2);
</klipse-snippet>
</section>
<section>
<h3>Object Shorthand</h3>
<klipse-snippet>
const value = 'some value';
const obj = {
method(param) {
console.log(param);
},
value,
};
obj.method('hi');
obj;
</klipse-snippet>
</section>
<section>
<h3>Destructuring</h3>
<klipse-snippet>
const obj = {
prop: 'some value',
nested: {
prop: 'nested value',
},
};
const {
prop: value1,
nested: {
prop: value2,
},
value3 = 'default value',
} = obj;
({value1, value2, value3});
</klipse-snippet>
</section>
<section>
<h3>Rest</h3>
<klipse-snippet>
function fn(...args) {
return args;
}
fn(1, 2, 3)
</klipse-snippet>
</section>
<section>
<h3>Spread</h3>
<klipse-snippet>
const values = [4, 8, 2, 5];
Math.min(...values);
</klipse-snippet>
</section>
</section>
<section>
<section>
<h3>ES6 Generators</h3>
</section>
<section>
<h3>Generator Function</h3>
<p>Factory for generator objects</p>
<klipse-snippet>
function* numbers(n) {
for (let i = 1; i <= n; i += 1) {
yield i;
}
return 'Completed';
}
const it = numbers(2);
</klipse-snippet>
</section>
<section>
<h3>Generator Objects</h3>
<klipse-snippet>
function* numbers(n) {
for (let i = 1; i <= n; i += 1) {
yield i;
}
return 'Completed';
}
const it = numbers(2);
it.next();
// it.next();
// it.next();
// it.next();
</klipse-snippet>
</section>
<section>
<h3>Generator Objects As Iterables</h3>
<klipse-snippet>
function* numbers(n) {
for (let i = 1; i <= n; i += 1) {
yield i;
}
return 'Completed';
}
for (let n of numbers(2)) {
console.log(n);
}
[...numbers(3)];
</klipse-snippet>
</section>
</section>
<section>
<section>
<h3>Let's Create a Runner</h3>
</section>
<section>
<h3>Simple Runner</h3>
<klipse-snippet data-async-code="true">
function* numbers(n) {
for (let i = 1; i <= n; i += 1) {
console.log(yield i);
}
}
function runner(fn, ...args) {
const it = fn(...args);
function step(value) {
const result = it.next(value);
if (!result.done) {
setImmediate(() => step(result.value));
}
}
setImmediate(step);
}
// runner(numbers, 3);
</klipse-snippet>
</section>
<section>
<h3>Promise Based Runner</h3>
<klipse-snippet>
function runner(fn, ...args) {
return new Promise(resolve => {
const it = fn(...args);
function step(value) {
const result = it.next(value);
if (!result.done) {
Promise.resolve(result.value).then(step);
} else {
resolve(result.value);
}
}
setImmediate(step);
});
}
</klipse-snippet>
</section>
<section>
<h3>Promise Based Runner in Action</h3>
<klipse-snippet data-external-libs="js/promiseRunner.js" data-async-code="true">
function* main(steps) {
for (let i = 1; i <= steps; i += 1) {
const start = now();
yield delay(Math.random() * 5);
console.log(`Completed step ${ i } in ${ now() - start } secs`);
}
}
function now() {
return Math.floor(Date.now() / 1000);
}
function delay(sec) {
return new Promise(resolve => setTimeout(resolve, sec * 1000));
}
// runner(main, 3);
</klipse-snippet>
</section>
<section>
<h3>Effect Based Runner</h3>
<klipse-snippet>
function effect(type, ...args) {
return {
effect: type,
args,
};
}
</klipse-snippet>
</section>
<section>
<h3>Effect Based Runner</h3>
<klipse-snippet>
function runEffect(value) {
if (!value || !value.effect) return Promise.resolve(value);
if (value.effect === 'CALL') {
const [fn, ...fnArgs] = value.args;
return runEffect(fn(...fnArgs));
}
if (value.effect === 'FORK') {
const [fn, ...fnArgs] = value.args;
setImmediate(() => runEffect(fn(...fnArgs)));
return Promise.resolve();
}
throw new Error('Unknown effect');
}
</klipse-snippet>
</section>
<section>
<h3>Effect Based Runner</h3>
<klipse-snippet>
function runner(fn, ...args) {
return new Promise(resolve => {
const it = fn(...args);
function step(value) {
const result = it.next(value);
if (!result.done) {
runEffect(result.value).then(step);
} else {
resolve(result.value);
}
}
setImmediate(step);
});
}
</klipse-snippet>
</section>
<section>
<h3>Effect Based Runner in Action</h3>
<klipse-snippet data-external-libs="js/effectRunner.js,js/util.js" data-async-code="true">
function* main(workers) {
for (let i = 1; i <= workers; i += 1) {
yield effect('FORK', runner, worker, i);
}
}
function* worker(id) {
const start = now();
console.log(`Worker ${ id } started`);
yield effect('CALL', delay, Math.random() * 5);
console.log(`Worker ${ id } completed in ${ now() - start } secs`);
}
// runner(main, 2);
</klipse-snippet>
</section>
</section>
<section>
<section>
<h3>Communicating Sequential Processes</h3>
</section>
<section>
<h3>CSP Channel</h3>
<klipse-snippet>
const CLOSED = null;
function channel() {
let closed = false;
const takers = [];
const putters = [];
return {
put(value, callback = () => {}) {
if (closed) return callback(false);
if (takers.length) {
const {fn} = takers.shift();
setImmediate(() => fn(value));
callback(true);
} else {
putters.push({fn: callback, value});
}
},
take(callback = () => {}) {
if (closed) return callback(CLOSED);
if (putters.length) {
const {fn, value} = putters.shift();
setImmediate(() => fn(true));
callback(value);
} else {
takers.push({fn: callback});
}
},
close() {
if (closed) return;
closed = true;
while (takers.length) {
const {fn} = takers.shift();
setImmediate(() => fn(CLOSED));
}
while (putters.length) {
const {fn} = putters.shift();
setImmediate(() => fn(false));
}
},
isClosed() {
return closed;
},
};
}
</klipse-snippet>
</section>
<section>
<h3>CSP Effects </h3>
<klipse-snippet>
function runEffect(value) {
// ...
if (value.effect === 'PUT') {
const [chan, val] = value.args;
return new Promise(resolve => chan.put(val, resolve));
}
if (value.effect === 'TAKE') {
const [chan] = value.args;
return new Promise(resolve => chan.take(resolve));
}
// ...
}
</klipse-snippet>
</section>
<section>
<h3>CSP Example</h3>
<klipse-snippet data-external-libs="js/cspRunner.js,js/util.js" data-async-code="true">
function* main(workers, duration) {
const ch = channel();
for (let i = 1; i <= workers; i += 1) {
yield effect('FORK', runner, worker, i, ch);
}
setTimeout(() => ch.close(), duration * 1000);
while (!ch.isClosed()) {
const work = effect('CALL', delay, Math.random() * 5);
yield effect('PUT', ch, work);
}
console.log('Main done');
}
function* worker(id, ch) {
while (true) {
const work = yield effect('TAKE', ch);
if (work === CLOSED) break;
const start = now();
yield work;
console.log(`Worker ${ id } finished in ${ now() - start } secs`);
}
console.log(`Worker ${ id } done`);
}
// runner(main, 3, 10);
</klipse-snippet>
</section>
<section>
<h3>CSP Example 2</h3>
<klipse-snippet data-external-libs="js/cspRunner.js,js/util.js" data-async-code="true">
function* main(count) {
const ch = channel();
document.addEventListener('click', e => ch.put(e));
for (let i = 1; i <= count; i += 1) {
const result = yield effect('TAKE', ch);
if (result !== CLOSED) {
console.log(`click ${ i }`);
}
}
ch.close();
}
// runner(main, 3);
</klipse-snippet>
</section>
</section>
<section>
<section>
<h3>Redux Saga</h3>
<p class="fragment">Uses es6 generators to orchestrate side effects in redux</p>
</section>
<section data-transition="slide-in fade-out">
<h3>Redux Architecture</h3>
<img src="imgs/reduxArchitecture.svg" style="border:none" />
</section>
<section data-transition="fade-in slide-out">
<h3>Redux Architecture</h3>
<img src="imgs/reduxArchitectureWithSaga.svg" style="border:none" />
</section>
<section>
<h3>Saga Middleware</h3>
<klipse-snippet>
function configureStore(initialState) {
const sagaMiddleware = createSagaMiddleware();
const enhancer = applyMiddleware(sagaMiddleware);
const store = createStore(rootReducer, initialState, enhancer);
sagaMiddleware.run(rootSaga);
}
</klipse-snippet>
</section>
<section>
<h3>Saga Example</h3>
<klipse-snippet data-external-libs="js/sagaEffects.js">
function* saga() {
const action = yield take('SOME_ACTION');
yield put({
type: 'OTHER_ACTION',
});
yield call(console.log, 'completed', action);
}
// [...saga()];
</klipse-snippet>
</section>
<section>
<h3>Easy to test</h3>
</section>
<section>
<h3>What about thunks</h3>
</section>
<section>
<h3>Limitations</h3>
</section>
<section>
<h3>Channels</h3>
</section>
</section>
<section>
<section>
<h3>Saga Effects API</h3>
</section>
<section>
<h3 style="text-transform:none">take( pattern | matcher | channel )</h3>
<p>Stop generator until matching action is dispatched</p>
<klipse-snippet height="200px">
function* saga() {
const action = yield take('SOME_ACTION');
}
</klipse-snippet>
</section>
<section>
<h3 style="text-transform:none">put( action )</h3>
<p>Dispatch action and continue</p>
<klipse-snippet height="200px">
function* saga() {
yield put({
type: 'SOME_ACTION',
});
}
</klipse-snippet>
</section>
<section>
<h3 style="text-transform:none">call( saga | function , ...args )</h3>
<p>Run saga or function and wait until completed</p>
<klipse-snippet height="200px">
function* saga() {
yield call(fn, ...args);
}
</klipse-snippet>
</section>
<section>
<h3 style="text-transform:none">fork( saga | function , ...args )</h3>
<p>Run saga or function without waiting</p>
<klipse-snippet height="200px">
function* saga() {
yield fork(fn, ...args);
}
</klipse-snippet>
</section>
<section>
<h3 style="text-transform:none">select( selector , ...args )</h3>
<p>Return state from redux store</p>
<klipse-snippet height="200px">
function* saga() {
const state = yield select();
}
</klipse-snippet>
</section>
<section>
<h3>Effect Combinators</h3>
</section>
<section>
<h3 style="text-transform:none">[ ...effects ]</h3>
<p>Run effects and wait until all have completed</p>
<klipse-snippet height="300px">
function* saga() {
const results = yield [
call(fn, ...args),
take('SOME_ACTION'),
take('OTHER_ACTION'),
];
}
</klipse-snippet>
</section>
<section>
<h3 style="text-transform:none">race({ ...effects })</h3>
<p>Run effects and wait until one has completed</p>
<klipse-snippet height="300px">
function* saga() {
const results = yield race({
response: call(fn, ...args),
someAction: take('SOME_ACTION'),
otherAction: take('OTHER_ACTION'),
});
}
</klipse-snippet>
</section>
<section>
<h3>Higher Order Effects</h3>
</section>
<section>
<h3 style="text-transform:none">takeEvery( pattern | matcher , saga , ...args )</h3>
<p>Run saga for each matching action</p>
<klipse-snippet height="200px">
function* saga() {
yield takeEvery('SOME_ACTION', someSaga, ...args);
}
</klipse-snippet>
</section>
<section>
<h3 style="text-transform:none">takeLatest( pattern | matcher , saga , ...args )</h3>
<p>Run saga for most recent matching action</p>
<klipse-snippet height="200px">
function* saga() {
yield takeLatest('SOME_ACTION', someSaga, ...args);
}
</klipse-snippet>
</section>
</section>
<section>
<h3>Demo time</h3>
</section>
<section>
<h3>Questions</h3>
</section>
</div>
</div>
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