MBot

A modular bot framework.

Home Page (documentation): https://liciojr.github.io/mbot

Git Repository: https://github.com/liciojr/mbot

NPM Package: https://www.npmjs.com/package/mbot

Setup

Quick Start

1. Clone the repository;
2. Install dependencies: npm i
3. Start with adapters/console (*): npm start

(*) other adapters (see "Adapters" section for custom configuration):

• adapters/rest: npm run start-rest
  • see adapter key configuration in config/core/brain.rest.json
• adapters/xmpp: npm run start-xmpp
  • see adapter key configuration in config/core/brain.xmpp.json
  • require a XMPP server (e.g. Openfire)

New Project

1. Create a project:
   • npm init -y;
2. Install library and dependencies:
   • npm i --save mbot
3. Create json configuration files in /config (default 'dev' environment);
4. Create javascript modules in /bot_modules and /kb;
5. Create app.js with:
   • require('mbot').init();
6. Run:
   • node app.js

Features

• modular structure (e.g. communication, knowledge base, classifier, utilities), facilitating collaborative working;
• centralized multi-environment configuration;
• flexible integrated logging;
• universal database abstraction (Sails Waterline) for relational and NoSQL databases;
• global filesystem overlay;
• automatic lifecycle management with asynchronous init/dispose;
• extensible adapters (e.g. console, rest, xmpp, test);
• helper plugins (e.g. logger, HTML parser/scraper, spreadsheet reader, test stub, HTTP/HTTPS consumer).

Configuration

• plain JSON format;
• standard path convention (/config/dir/name.{env}.json);
• extensible configuration, with MBOT_NODE_ENV and MBOT_NODE_ENV_ALT environment variables (allow partial redefinition, with ALT fallback);
• built-in environments:
  • dev: development (default)
  • tmp: temporary (git ignored)
  • tst: test automation (with nlp/hashtag)
  • tst_bayes: test automation (with nlp/bayes)
  • rest: rest adapter
  • xmpp: xmpp adapter
  • template: custom template
  • prd: production (suggested)
• automatic init setup with config modules property;
• system variable support in any value, replaced at runtime in mbot.config loader:

{
    "key": "${ENV_VAR_X}"
}

Logging

• 'util/logger' helper with integrated configuration;
• shared use with core mbot.logger();
• allow multiple transport channels and categories.

Database Abstraction

• 'util/db' helper for direct Waterline integration (without Sails);
• multiple relational (MySQL, PostgreSQL, FileMaker, Apache Derby, ...) and NoSQL (MongoDB, Redis, OrientDB, ...) database adapters, with same interface;
• multiple source model integration;
• allow custom adapters creation;
• built-in (zero configuration) disk/memory adapter for fast prototyping and test automation.

Overlay and Lifecycle Management

• core function mbot.load uses filesystem overlay (mbot.path) to import (require) a module, and save its init/dispose callback (if exists);
• async single/multiple initialization, to instant or previous loaded modules (mbot.init);
• async global dispose (mbot.dispose).

Adapters

Modules in /adapters folder, with init and onEvent (observer pattern) functions, allowing easily creation of custom adapters.

Choose and configure in config/core/brain.{env}.json file, at adapter.type key.

Built-in adapters:

• console.js - command-line interface adapter, configuration example:

    "adapter": {
        "type": "console",
        "from": "admin@localhost",
        "prompt": "[question] "
    }

• xmpp.js - XMPP protocol adapter, configuration example:

    "adapter": {
        "type": "xmpp",
        "setPresence": {
            "status": "chat",
            "text": "alpha version"
        },
        "settings": {
            "jid": "mbot@localhost",
            "password": "${MBOT_XMPP_PWD}",
            "host": "localhost",
            "port": 5222            
        }
    }

• rest.js - REST service adapter, configuration example:

    "adapter": {
        "type": "rest",
        "get": "/mbot",
        "port": 8080,
        "headers": {
            "Access-Control-Allow-Origin": "*"
        }
    }

• test.js - Test automation adapter, configuration example:

    "adapter": {
        "type": "test",
        "from": "usr1"
    }

Architecture

The solution has the following structure:

• config: central configuration directory ({module}.{environment}.json format);
• adapters: front-end modules (e.g. XMPP, REST, Console);
• bot_modules: communication modules (specialized dialogs);
• kb: knowledge base;
• lib/core: asynchronous core and subsystems facade;
• nlp: natural language processing modules;
• util: utilities (e.g. HTML extractor, spreadsheet reader, HTTP consumer, database integration, logger).

Applications should focus on bot_modules and kb sections.

Workflow Summary

A main controller (lib/core/brain) execute the following tasks:

1. read config/core/brain.{env}.json configuration;
2. load model and open database configured in db key;
3. invoke core loader (lib/index) to fetch configured modules in loader.bot_modules key from config/index.{env}.json;
4. load language module configured in nlp key;
5. invoke core asynchronous global init;
6. load and start adapter configured in adapter key;
7. register adapter onReply event and wait for requests.

For each request, the main controller creates a dialog object with some properties:

{
    from: 'user abc',
    text: 'question xyz',
    state: {},
    action: '',
    entities: [],
    nonEntities: []
}

The NLP module fills entities/nonEntities fields information, and returns a list of compatible intents (communication module / action). By default, following rules apply:

• if none or 3+ modules are compatible, will return brain.message.unknown configured message;
• if 2 modules/actions are compatible, will return brain.message.refine and respective help text, for user refinement;
• if only one module/action is compatible, it will be invoked to format a reply.

A communication module can use the state dictionary to hold user/session information (see bot_modules/examples/echo_bot).

Collaborative Work

The framework was designed to allow multiple concurrent development on the same repository. To accomplish this, follow these steps:

• define a user tag, example: u01;
• clone bot_modules/templates/hello_bot to bot_modules/u01/hello_bot, replacing "template" with "u01" in keywords array:

module.exports = {
    keywords: ['u01'],
    reply
}

• clone config/index.template.json to config/index.u01.json, replacing "templates" with "u01" in "loader.bot_modules" section:

{
    "loader": {
        "bot_modules": {
            "u01": "*"
        },

• define environment variable MBOT_NODE_ENV with u01, and start MBOT;
• type "u01" to receive a welcome message;
• to customize main controller features, clone config/core/brain.template.json to config/core/brain.u01.json, replacing whatever you want;
• any Knowledge Base modules in kb/* can be used, or a new directory kb/u01 can be created to add new ones.

Bot Modules

NLP Modules

Configure a Natural Language Processing module with nlp.type key in config/core/brain.{env}.json file, example:

    "nlp": {
        "type": "bayes",
        "cache": ".tmp/bayes_cache.json",
        "stemmer": "node_modules/natural/lib/natural/stemmers/porter_stemmer.js"
    }

Built-in modules:

• nlp/hashtag: deterministic classifier, based on rules;
• nlp/bayes: natural classifier, with Naive-Bayes algorithm.

To create a NLP module, implement a classify function in nlp folder, with 2 arguments: a dialog and a callback. Remember to configure nlp.type key.

Current Named Entity Recognition use a simplified rule set:

• text between quotes, example:
  • how old is "Peter Parker"?
    • entities ["Peter Parker"]
• words starting with digit, example:
  • sum 5 and 6
    • entities ["5", "6"]
• words starting with uppercase, except at the beginning of a sentence, and with more than one letter, example:
  • What is Peter phone?
    • entities ["Peter"]

Communication Modules

Files under bot_modules folder, with following interface:

• Required:
  • keywords property (string array): first element required (master keyword for deterministic classifier). Other keywords used for natural language classifier;
  • reply(dialog, callback) function;
• Optional:
  • actions property (object): action dictionary, each entry with keywords string/array;
  • help property (string): help text.

Examples:

• currency_bot.js - display a list of countries related to a currency symbol, example:
  • which countries use "GBP" currency?
  • "BRL" country
• degree_bot.js - temperature conversion bot, examples:
  • 95 to celsius
  • 35 to fahrenheit
• echo_bot.js - simple echo message, example:
  • some echo here
• geo_bot.js - display your/some IP address location, examples:
  • my address?
  • ip of "github.com"
• google_bot.js - show latest technology news from google site, example:
  • tech news
• hobby_bot.js - user hobby list manager, examples:
  • please, include a new hobby for me: Carpentry
  • show my hobbies

Knowledge Base Modules

Any file under kb folder. Examples:

• currency_kb.js - use util/spreadsheet helper to read information from a spreadsheet file;
• degree_kb.js - use soap external library to consume a public SOAP webservice at webservicex.net;
• geo_kb.js - use util/http helper to consume a public REST service at http://freegeoip.net;
• google_kb.js - use util/html helper to extract information from a Google HTML page;
• hobby_kb.js - use util/db helper to interact with a database.

Tests

First time, type npm install to fetch dependencies, then type npm test.

Test support:

• adapters/test.js: expose "request" method for test automation;
• util/test.js: utility helper for test implementation, compatible with Mocha framework;
• test/examples/*: implementation examples.

License

GNU Lesser General Public License (LGPL), version 3 or later.

See the LICENSE file in the root directory or https://www.gnu.org/licenses/lgpl.html.