Event Sourcing

LiveActor.js

class User extends LiveActor {
    constructor( id, injectionContainer ) {
        super( id, injectionContainer );
        
        // set initial state for all users
        this._state[ 'logged_in' ] = false;
    }
    
    /**
     * Login a user
     */
    DoLoginAttempt( password, browserFingerprint ) {
        if ( this._state[ 'too_many_tries' ] ) {
            return this.Fire( 'too_many_tries' );
        }
        
        if ( this._state[ 'password' ] === password ) {
            const token = this.generateToken();
            this.Fire( 'logged_in', {
                browserFingerprint,
                token
            } );
            return token;
        } else {
            return this.Fire( 'invalid_login', {
                browserFingerprint
            } );
        }
    }
    
    /* Event handlers follow */
    
    /*
     * Handle an invalid login attempt
     */
    invalid_login( data ) {
        // do logic
    }
}

test.js

await Given( 'A user logs in for the first time', [
    {
        name: 'signup',
        data: {
            username: 'test',
            password: 'test'
        }
    }
] ).When( User, 'DoLogin', 'test', {} ).Then( [
    {
        name: 'logged_in',
        data: {
            browserFingerprint: {},
            token: '{string}'
        }
    }
] ).AndState( {
    logged_in: true,
    invalid_password_tries_in_last_period: 0
    // etc
} )