react-command-bus/README.md

# Command Bus for ReactPHP

## Features

* Can run monolithic (create a bus and use as is), or distributed (create bus and use clients), or in a hybrid setup. The CommandBus functions identical with or without listeners and clients.
* All commands called asynchronously using promises and deferreds.
* Push notifications from the bus to subscribers and listeners, such as progress or log/error messages.

### Potential caveats

* There is no security, nor encryption. This is intended to work between a daemon and a frontend, and is designed primarily considering all activity taking place on localhost. You can use ReactPHPs `SecureConnector` and `SecureServer` to encrypt the traffic, but this still allows anyone to connect and interact with the bus. If this sounds like something that should be changed, open a ticket.

## Installing

```shell
$ composer require noccylabs/react-command-bus:^0.1.0
```

## Usage

```php
// The registry holds the callable commands
$commands = new CommandRegistry();

// Register some function to call. The name here is "hello", and it will
// receive a Context holding the call context. Any passed data will be
// available as properties on the Context object.
$commands->register("hello", function (Context $context) {
    // You don't have to, but you should return a promise from your 
    // commands.
    return new Promise(function (callable $resolve) use ($context) {
        Loop::addTimer(1, function () use ($context, $resolve) {
            $resolve("Hello, {$context->name}");
        });
    });
});

// Create the bus
$bus = new CommandBus($commands);

// And execute some commands!
$bus->execute('hello', ['name'=>'Bob'])->then(
    function ($result) {
        var_dump($result);
    }
);
```