aa - async-await

co like library, go like channel, thunkify or promisify wrap package.

using ES6 (ES2015) generator function.

compatible with co@3 and co@4.

INSTALL:

$ npm install aa --save
   or
$ npm install async-await --save

PREPARE:

  var aa = require('aa');
  // or
  var aa = require('async-await');
 
  var promisify    = aa.promisify;
  var thunkify     = aa.thunkify;
  var promisifyAll = aa.promisifyAll;
  var thunkifyAll  = aa.thunkifyAll;
  var Channel      = aa.Channel;
 
  var Promise      = aa.Promise;      // override native Promise
  var PromiseThunk = aa.PromiseThunk; // use PromiseThunk indivisually

https://lightspeedworks.github.io/promise-thunk/promise-thunk.js
https://lightspeedworks.github.io/aa/aa.js

<script src="https://lightspeedworks.github.io/promise-thunk/promise-thunk.js"></script>
<script src="https://lightspeedworks.github.io/aa/aa.js"></script>

USAGE:

aa(generator or generator function)

aa() returns promise (thunkified promise).

basic usage.
you can aa() promises, generators, and generator functions.

aa(function *() {
    // *** SEQUENTIAL EXECUTION ***
 
    // yield value returns itself
    yiled 1;
    yiled [1, 2, 3];
    yiled {x:1, y:2, z:3};
 
    // yield promise returns resolved value
    yield Promise.resolve(1);
 
    // or throws rejected error
    try { yield Promise.reject(new Error('expected')); }
    catch (e) { console.error('%s', e); }
 
    // *** PARALLEL EXECUTION ***
 
    // yield an array of promises waits all promises and returns resolved array
    yield [Promise.resolve(1), Promise.resolve(2)];
 
    // yield an object of promises waits all promises and returns resolved object
    yield {x: Promise.resolve(1), y: Promise.resolve(2)};
 
    // *** OTHERS AND COMBINED OPERATIONS ***
 
    // yield thunk
    // yield generator or generator function
    // yield channel for event stream
});

aa.promisify([ctx,] fn, [options])

promisify() converts node style function into a function returns promise-thunk.
you can use fs.exists() and child_process.exec() also.

ctx: context object. default: this or undefined.
fn: node-style normal function.
options: options object.
- context: context object.

also thenable, yieldable, callable.

postgres `pg` example:

var pg = require('pg');
var pg_connect = aa.promisify(pg, pg.connect);         // -> yield pg_connect()
var client_query = aa.promisify(client, client.query); // -> yield client_query()

aa.promisify(object, method, [options])

promisify() defines method promisified function returns promise-thunk.

object: target object.
method: method name string.
options: method name suffix or postfix. default: 'Async'. or options object.
- suffix: method name suffix or postfix. default: 'Async'.
- postfix: method name suffix or postfix. default: 'Async'.

postgres `pg` example:

var pg = require('pg');
aa.promisify(pg, 'connect', {suffix: 'A'};             // -> yield pg.connectA()
aa.promisify(pg.Client.prototype, 'connect'); // -> yield client.connectAsync()
aa.promisify(pg.Client.prototype, 'query');   // -> yield client.queryAsync()

aa.promisifyAll(object, [options])

promisifyAll() defines all methods promisified function returns promise-thunk.

object: target object.
options: method name suffix or postfix. default: 'Async'. or options object.
- suffix: method name suffix or postfix. default: 'Async'.
- postfix: method name suffix or postfix. default: 'Async'.

file system `fs` example:

var fs = require('fs');
aa.promisifyAll(fs, {suffix: 'A'});  // -> yield fs.readFileA()

postgres `pg` example:

var pg = require('pg');
aa.promisifyAll(pg.constructor.prototype, {suffix: 'A'});  // -> yield pg.connectA()
aa.promisifyAll(pg.Client.prototype);  // -> yield client.connectAsync()
                                       // -> yield client.queryAsync()

aa.thunkify([ctx,] fn, [options])

thunkify() converts node style function into a thunkified function.
you can use fs.exists() and child_process.exec() also.

ctx: context object. default: this or undefined.
fn: node-style normal function with callback.
options: options object.
- context: context object.

also yieldable, callable.

postgres `pg` example:

var pg = require('pg');
var pg_connect = aa.thunkify(pg, pg.connect);         // -> yield pg_connect()
var client_query = aa.thunkify(client, client.query); // -> yield client_query()

aa.thunkify(object, method, [options])

thunkify() defines method thunkified function returns thunk.

object: target object.
method: method name string.
options: method name suffix or postfix. default: 'Async'. or options object.
- suffix: method name suffix or postfix. default: 'Async'.
- postfix: method name suffix or postfix. default: 'Async'.

postgres `pg` example:

var pg = require('pg');
aa.thunkify(pg, 'connect', {suffix: 'A'});  // -> yield pg.connectA()
aa.thunkify(pg.Client.prototype, 'connect'); // -> yield client.connectAsync()
aa.thunkify(pg.Client.prototype, 'query');   // -> yield client.queryAsync()

aa.thunkifyAll(object, [options])

thunkifyAll() defines all methods thunkified function returns thunk.

object: target object.
options: method name suffix or postfix. default: 'Async'. or options object.
- suffix: method name suffix or postfix. default: 'Async'.
- postfix: method name suffix or postfix. default: 'Async'.

file system `fs` example:

var fs = require('fs');
aa.thunkifyAll(fs, {suffix: 'A'});  // -> yield fs.readFileA()

postgres `pg` example:

var pg = require('pg');
aa.thunkifyAll(pg.constructor.prototype, {suffix: 'A'});  // -> yield pg.connectA()
aa.thunkifyAll(pg.Client.prototype);  // -> yield client.connectAsync()
                                      // -> yield client.queryAsync()

aa.Channel() : new channel for event stream

Channel() returns a new channel for event stream.
use a channel for node style function as a callback.
yield channel for wait it.

yield : waits and returns resolved value.

you can yield promises, thunkified functions, generators, generator functions, primitive values, arrays, and objects.

aa.callback(gtor) : returns callback function

callback(gtor) returns normal callback function

http.createServer(aa.callback(function *(req, res) {
    yield aa.wait(1000);
    res.end('delayed hello');
})).listen(process.env.PORT || 8000);

EXAMPLES:

Example 1 sequential: aa-readme-ex01-seq.js

$ node aa-readme-ex01-seq.js

    var aa = require('aa');
 
 
    aa(main);
 
 
    function *main() {
        console.log('11:', yield asyncPromise(100, 11));
        console.log('12:', yield asyncThunk(100, 12));
        console.log('13:', yield asyncGenerator(100, 13));
        yield sub(20);
        yield sub(30);
    }
 
 
    function *sub(base) {
        console.log('%s: %s', base + 1, yield asyncPromise(100, base + 1));
        console.log('%s: %s', base + 2, yield asyncThunk(100, base + 2));
        console.log('%s: %s', base + 3, yield asyncGenerator(100, base + 3));
    }
 
 
    // asyncPromise(msec, arg) : promise
    function asyncPromise(msec, arg) {
        return new Promise(function (resolve, reject) {
            setTimeout(resolve, msec, arg);
        });
    }
 
 
    // asyncThunk(msec, arg) : thunk
    function asyncThunk(msec, arg) {
        return function (callback) {
            setTimeout(callback, msec, null, arg);
        };
    }
 
 
    // asyncGenerator(msec, arg) : generator
    function *asyncGenerator(msec, arg) {
        var chan = aa.Channel();
        setTimeout(chan, msec, arg);
        return yield chan;
    }

Example 2 parallel: aa-readme-ex02-par.js

$ node aa-readme-ex02-par.js

    var aa = require('aa');
 
 
    aa(main);
 
 
    function *main() {
        console.log('[11, 12, 13]:', yield [
            asyncPromise(100, 11),
            asyncThunk(100, 12),
            asyncGenerator(100, 13)
        ]);
 
        console.log('{x:11, y:12, z:13}:', yield {
            x: asyncPromise(100, 11),
            y: asyncThunk(100, 12),
            z: asyncGenerator(100, 13)
        });
 
        yield [sub(20), sub(30)];
    }
 
 
    function *sub(base) {
        console.log('%s: %s', base + 1, yield asyncPromise(100, base + 1));
        console.log('%s: %s', base + 2, yield asyncThunk(100, base + 2));
        console.log('%s: %s', base + 3, yield asyncGenerator(100, base + 3));
    }
 
 
    // asyncPromise(msec, arg) : promise
    function asyncPromise(msec, arg) {
        return new Promise(function (resolve, reject) {
            setTimeout(resolve, msec, arg);
        });
    }
 
 
    // asyncThunk(msec, arg) : thunk
    function asyncThunk(msec, arg) {
        return function (callback) {
            setTimeout(callback, msec, null, arg);
        };
    }
 
 
    // asyncGenerator(msec, arg) : generator
    function *asyncGenerator(msec, arg) {
        var chan = aa.Channel();
        setTimeout(chan, msec, arg);
        return yield chan;
    }

Example promisify: aa-readme-ex11-promisify.js

$ node aa-readme-ex11-promisify.js

    var aa = require('aa');
    var promisify = aa.promisify;
    var asyncPromise = promisify(asyncCallback);
 
 
    aa(main);
 
 
    function *main() {
        console.log('11:', yield asyncPromise(100, 11));
        console.log('12:', yield asyncPromise(100, 12));
        console.log('13:', yield asyncPromise(100, 13));
 
        asyncPromise(100, 21)
        .then(function (val) {
            console.log('21:', val);
            return asyncPromise(100, 22);
        })
        .then(function (val) {
            console.log('22:', val);
            return asyncPromise(100, 23);
        })
        .then(function (val) {
            console.log('23:', val);
        });
    }
 
 
    // asyncCallback(msec, arg. callback) : node style normal callback
    // callback : function (err, val)
    function asyncCallback(msec, arg, callback) {
        setTimeout(callback, msec, null, arg);
    }

Example thunkify: aa-readme-ex12-thunkify.js

$ node aa-readme-ex12-thunkify.js

    var aa = require('aa');
    var thunkify = aa.thunkify;
    var asyncThunk = thunkify(asyncCallback);
 
 
    aa(main);
 
 
    function *main() {
        console.log('11:', yield asyncThunk(100, 11));
        console.log('12:', yield asyncThunk(100, 12));
        console.log('13:', yield asyncThunk(100, 13));
 
        asyncThunk(100, 21)
        (function (err, val) {
            console.log('21:', val);
            asyncThunk(100, 22)
            (function (err, val) {
                console.log('22:', val);
                asyncThunk(100, 23)
                (function (err, val) {
                    console.log('23:', val);
                });
            });
        });
    }
 
 
    // asyncCallback(msec, arg. callback) : node style normal callback
    // callback : function (err, val)
    function asyncCallback(msec, arg, callback) {
        setTimeout(callback, msec, null, arg);
    }

Quick example collection: aa-readme-example.js

$ node aa-readme-example.js

  var aa = require('aa');
 
 
    // sleep(msec, args,... callback) : node style normal callback
    // callback : function (err, val)
    function sleep(msec) {
        var args = [].slice.call(arguments, 1);
        setTimeout.apply(null, [args.pop(), msec, null].concat(args));
    }
 
    sleep(1000, function (err, val) { console.log('1000 msec OK'); });
 
 
    // delay(msec, args,...)(callback) : thunk
    // callback : function (err, val)
    function delay(msec) {
        var args = [].slice.call(arguments);
        return function (callback) {
            sleep.apply(null, args.concat(callback));
        };
    }
    // var delay = aa.thunkify(sleep);
 
    delay(1100)(
        function (err, val) { console.log('1100 msec OK'); }
    );
 
 
    // aa.promisify(fn)   : returns wrapped function a.k.a thunkify and promisify
    // wait(msec, args,...) : returns promise & thunk
    var wait = aa.promisify(sleep);
 
    // wait() : as a thunk
    wait(1200)(
        function (err, val) { console.log('1200 msec OK'); }
    );
 
    // wait() : as a promise
    wait(1300).then(
        function (val) { console.log('1300 msec OK'); },
        function (err) { console.log('1300 msec NG', err); }
    ).catch(
        function (err) { console.log('1300 msec NG2', err); }
    );
 
 
    // aa(generator) : returns promise & thunk
    aa(function *() {
 
        yield 1;                    // primitive value
        yield [1, 2, 3];            // array
        yield {x:1, y:2, z:3};      // object
 
 
        // wait for promise
        yield Promise.resolve(2);
 
 
        // wait for thunk
        yield delay(800);
 
 
        // wait for promise or thunk
        yield wait(800);
 
 
        console.log('0:', yield wait(300, 0));
        console.log('1:', yield wait(300, 1));
 
 
        // yield Promise.all([])
        console.log('[1, 2, 3]:',
            yield Promise.all([wait(200, 1), wait(300, 2), wait(100, 3)]));
 
 
        // yield [] -> like Promise.all([]) !
        console.log('[4, 5, 6]:',
            yield [wait(200, 4), wait(300, 5), wait(100, 6)]);
 
 
        // yield {} -> like Promise.all({}) !?
        console.log('{x:7, y:8, z:9}:',
            yield {x:wait(200, 7), y:wait(300, 8), z:wait(100, 9)});
 
 
        // make channel for sync - fork and join
        var chan = aa.Channel();
 
        sleep(300, 20, chan);   // send value to channel : fork or spread
        sleep(200, 10, chan);   // send value to channel : fork or spread
        var a = yield chan;     // recv value from channel : join or sync
        var b = yield chan;     // recv value from channel : join or sync
        console.log('10 20:', a, b);
 
 
        // fork thread -  make new thread and start
        aa(function *() {
            yield wait(200);      // wait 200 msec
            return 200;
        })(chan);               // send 200 to channel : join or sync
 
        // fork thread -  make new thread and start
        aa(function *() {
            yield wait(100);      // wait 100 msec
            return 100;
        })(chan);               // send 100 to channel : join or sync
 
        // fork thread -  make new thread and start
        aa(function *() {
            yield wait(300);      // wait 300
            return 300;
        })(chan);               // send 300 to channel : join or sync
 
        // join threads - sync threads
        var x = yield chan;     // wait & recv first  value from channel
        var y = yield chan;     // wait & recv second value from channel
        var z = yield chan;     // wait & recv third  value from channel
        console.log('top 3 winners: 100 200 300:', x, y, z);
 
 
        // communicate with channels
        var chan1 = aa.Channel(), chan2 = aa.Channel();
 
        // thread 1: send to chan1, recv from chan2
        aa(function *() {
            sleep(100, 111, chan1);
            console.log('222:', yield chan2);
            sleep(100, 333, chan1);
            console.log('444:', yield chan2);
            sleep(100, 555, chan1);
            return 666;
        })(chan);
 
        // thread 1: recv from chan1, send to chan2
        aa(function *() {
            console.log('111:', yield chan1);
            sleep(100, 222, chan2);
            console.log('333:', yield chan1);
            sleep(100, 444, chan2);
            console.log('555:', yield chan1);
            return 777;
        })(chan);
        console.log('666 777:', yield chan, yield chan);
 
        return 11;
    })
    .then(
        function (val) {
            console.log('11 val:', val);
            return wait(100, 22); },
        function (err) {
            console.log('11 err:', err);
            return wait(100, 22); }
    )
    (function (err, val) {
            console.log('22 val:', val, err ? 'err:' + err : '');
            return wait(100, 33); })
    (function (err, val) {
            console.log('33 val:', val, err ? 'err:' + err : '');
            return wait(100, 44); })
    .then(
        function (val) {
            console.log('44 val:', val);
            return wait(100, 55); },
        function (err) {
            console.log('44 err:', err);
            return wait(100, 55); }
    )
    .catch(
        function (err) {
            console.log('55 err:', err);
            return wait(100, 66); }
    );

LICENSE:

MIT

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aa

aa - async-await

INSTALL:

PREPARE:

USAGE:

aa(generator or generator function)

aa.promisify([ctx,] fn, [options])

postgres pg example:

aa.promisify(object, method, [options])

postgres pg example:

aa.promisifyAll(object, [options])

file system fs example:

postgres pg example:

aa.thunkify([ctx,] fn, [options])

postgres pg example:

aa.thunkify(object, method, [options])

postgres pg example:

aa.thunkifyAll(object, [options])

file system fs example:

postgres pg example:

aa.Channel() : new channel for event stream

yield : waits and returns resolved value.

aa.callback(gtor) : returns callback function

EXAMPLES:

Example 1 sequential: aa-readme-ex01-seq.js

Example 2 parallel: aa-readme-ex02-par.js

Example promisify: aa-readme-ex11-promisify.js

Example thunkify: aa-readme-ex12-thunkify.js

Quick example collection: aa-readme-example.js

LICENSE:

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postgres `pg` example:

file system `fs` example:

postgres `pg` example:

postgres `pg` example:

postgres `pg` example:

file system `fs` example:

postgres `pg` example:

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