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@trigo/atrix

7.0.0-alpha5 • Public • Published

atrix

NSP Status

Description

Atrix is an opinionated micro-service framework

Goals

Content

See here for the Change Log

Example Server Setup

In the examples below, several /config.js files are cited. In a single project, you may have more than one config file, however, only one config file is used to create a service.

/demoService/handlers/{id}_GET.js

module.exports = (req, reply, service) => {
    reply({ status: 'ok' });
}

/demoService/config.js

module.exports = {
    // name of the service (REQUIRED)
    name: 'demoService',
    endpoints: {
        http: {
            // declare port to bind
            port: 3007,

            // the directory containing the handler files
            handlerDir: `${__dirname}/handlers`,

            // global server cors configuraton
            // see: https://hapijs.com/api#route-options rules apply here too
            cors: {
                // defaults to '*'
                origin: ['https://myui.myservice.at', 'http://lvh.me'],

                // allow additional headers to be sent when client XHR
                // lib is sending them like angular $http etc
                additionalHeaders: ['x-requested-with']
            },
            // request logger configuration
            requestLogger: {
                // enable the request logger
                enabled: false,

                // log full request body if content-type: application/javascript and multipart/form-data
                logFullRequest: true,

                // log full response if content-type: application/javascript
                logFullResponse: true,
            },

            // validation settings
            validation: {
                // list of regular expression that define the routed that should
                // return structured and verbose validation error responses that 
                // may be used in the fronened form logic et al.
                verbose: ['^/items$']
            }
        },
    },
    // Add service settings in here. They are accessible in the handler as "service.settings" object
    settings: {
        test: 'value',
    },
};

/index.js

'use strict';

// get  global atrix instance
const atrix = require('@trigo/atrix');

// load service config
const config = require('./demoService/config');

// crete service with config
const service = atrix.addService(config);

// start the service
atrix.services.demoService.start(); // returns promise

Handler definition

Declare a directory in which all handlers are contained, or add route handlers manually.

Filename routes

handlerDir

When using the handlerDir option the appropriate routes will be created based on the filenames and folder structure. The Caret symbol ^ is used as subroute indicator when using a single filename to represent a deep route. Route params can be defined by curly brackets e.g.: {id}

Special Characters:

  • _ the last underscore in the filename indicates the beginning of the http method to be used e.g.: persons_GET.js
  • ^ indicates the beginning of a subroute, e.g.: persons^details_GET.js
  • Something in between curly braces indicates a route param e.g.: persons^{id}_GET.js;
  • The method wildcard character (% by default) can be used to create a route for all http methods persons_%.js

Examples:

  • The file /handlers/persons^{id}^details_GET.js will create a route GET /persons/{id}/details.
  • The file /handlers/persons/{id}/details/GET.js will create the same route.
  • A wildcard character (by default %) can be used for the HTTP method file ending. A file with a wildcard character as a method would be open for following the HTTP methods: GET, PUT, POST, PATCH, OPTIONS, DELETE

Code Example:

/config.js

module.exports = {
    name: 'dummyService', // mandatory property
    endpoints: {
        http: {
            port: 3000,
            // the directory containing the handler files
            handlerDir: `${__dirname}/handlers`,
        },
    },
};

/handlers/persons_GET.js

module.exports = (req, reply, service) => {
    reply({status: 'ok'});
};

The route GET /persons is made available by the above examples.

Manually adding route handlers

Once a service has been created and an endpoint has been added, routes can be added manually.

const atrix = require('@trigo/atrix');

const service = atrix.addService({
    name: 'dummyService', 
    endpoints: {
        http: {
            port: 3000,
        },
    },
});

// service.handlers.add(httpMethod, route, handler);
service.handlers.add('GET', '/persons/{id}/details', (req, reply, service) => {
    reply({status: 'ok'});
});

service.start();

Security

Atrix uses a declarative pattern to define security options based on authentication strategies as they are implemented in Hapi.

Example config:

{
    name: 'secureService',
    // the security related settings
    security: {
        // define which strategies are available in your service
        stragtegies: {        
            // JWT based authentication
            jwt: {
                // Static JWT configuration
                //
                // the jwt secret used to sign the tokens
                secret: 'jwt-secret-key', 
                // the algorithm to use. Change to RS256 for priv/pubkey signing
                algorithm: 'HS256'
                
                // OR better
                // use dynamic JWKS based Key retrieval from OIDC server
                // using auth0's "jwks-rsa" (https://github.com/auth0/node-jwks-rsa/tree/master) 
                jwks: {
                    // Url to fetch keys 
                    jwksUri: 'https://sso.apps.ocp.trigo.cloud/auth/realms/atrix-test-realm/protocol/openid-connect/certs',
                    
                    // use key cache
                    cache: true,

                    // rate Limit
                    rateLimit: true,

                    // max jwks requests 
                    jwksRequestsPerMinute: true,
                },

                verifyOptions: {
                    issuer: 'https://sso.apps.ocp.trigo.cloud/auth/realms/atrix-test-realm',
                    audience: 'account',
                    algorithms: ['RS256'],
                },

                // optional custom user validation function    
                validateUser: async () => (decodedToken, request, h) {
                    // some custom logic
                    const isValid = doYouStuff(decodedToken);
                    return { isValid };
                }
            },            
            // authentication baes on query param "auth" containing a vaild signatiure of the link    
            signedlink: {
                // the singed link secret used to create the signature
                secret: 'loink-sign-secret',
                // override default behaviour when signed lonk authorization failes.
                failAction: async (request, h, reason) => {
                    // use the "h" parameter to return custom responses see:
                    // https://hapijs.com/api#response-toolkit

                    // return HTTP 401 Unauthorized. This is the default implementation
                    // that is used when the failAction option is omited.
                    // to ignore the failure return h.continue
                    return h.unauthorized(Boom.unauthorized(reason))
                }
            },
            // authenticate using HTTP Basic Auth
            basic: {
                // setup the function used to validate your user credentials
                // if credentials are correct return an object of shape 
                // {
                //    isValid: true,
                //    // the credentials to attach to the auth context that are acessible in
                //    // the request handlers
                //    credentials: {...}
                // }
                // when authentication fails:
                // { isValid: false }
                // to return a standard Boom.unauthorized() error
                validate: async (request, username, password) => {
                    // the actual authentication logic
                    const success = await myCustomUsernamePasswordValidator(username, password);
                    
                    // credentials are ok
                    if (success) {
                        return { 
                            // it worked
                            isValid: true, 
                            // the credentials to attach to the auth context
                            credentials: { username, foo: 'bar' }
                        };
                    }

                    // authentication failed
                    return {isValid: false};
                },
                // if set true, empty usernames are allowed
                allowEmptyUsername: false
            }
        },
        // attach to enpoints using endpoint expressions
        endpoints:{
            // apply to everything below /secured-by-jwt
            jwt: ['^/secureed-by-jwt.*'], 
            // apply to everything below /secured-by-signedlink
            signedlink: ['^/secureed-by-signedlink.*'],
            // apply basic authenication to /with-basic-auth and below
            basic: ['^/with-basic-auth.*'],
        }
    }    
}

Validation

Atrix uses Hapi/Joi to perform request and response validation. Validation is configureed by configuing hapi's route.options.validate object https://hapijs.com/api#route-options.

Configure API validation rules

atrix-swagger

Whenever possible use the atrix-swagger plugin to setup proper validations for your API.

As in some cases this will not be suitable for your needs (e.g. limitation of swagger et al) you can allways configure those options manually

When adding a handler using code

service.handlers.add('POST', '/{id}', (req, reply) => reply(req.payload), {
    validate: {
        params: {
            id: Joi.string().regex(/^[a-z]{3}$/),
        },
    },
});

in a handlerfile

handlers/cars/{id}/POST.js

const Joi = require('joi');

module.exports.options = {
    validate: {
        payload: Joi.object({
            name: Joi.string().required(),
        }),
    },
    params: {
        id: Joi.string().required().regex(/[0-9a-f]{16}/)
    },
    query: <schema>
    headers: <schema>
    response: {
        status: {
            201: <schema>,
            202: <schema>,
        }
    }
};

module.exports.handler = async (req, reply, service) => { ... };

Validation options

The validation option are applied to the routes after all other configurations are done by route processor plugins like atrix-swagger et al.

/config.js

module.exports = {
    name: 'serviceName',
    endpoints: {
        http: {
            port: 3000,

            // the validation config
            validation: {
                // list of route patterns of the routes that should return
                // vaerbose validation errors
                // defaults to: []
                verboseEndpoints: ['^/internal/.*$', ...]
                // list of route patterns that enforce strict validation. E.g. do not
                // allow unknown keys. When strict checking is disabled the unknown 
                // keys will be ignored and stripped from the objects before they are
                // passed on the header.
                strictEndpoints: ['^/public.*$']
            },
        },
    },
};

Verbose validation

Per default the server reutrns just HTTP statusCode 400 Bad Request withpout any further details where exactly the validation failed.

{
  "statusCode": 400,
  "error": "Bad Request",
  "message": "Invalid request payload input"
}

When enabling verbose validation the errors response contains details aboout all failed validators, thier types and expected/valid values.

{
  "statusCode": 400,
  "error": "Bad Request",
  "message": "child \"events\" fails because [\"events\" at position 1 fails because [child \"resId\" fails because [\"resId\" is required]]]. child \"links\" fails because [child \"href\" fails because [\"href\" must be a valid uri], child \"method\" fails because [\"method\" must be one of [GET, POST, PUT]], child \"response\" fails because [\"response\" with value \"herbert\" fails to match the required pattern: /^testOida$/]]",
  "validation": {
    "source": "payload",
    "keys": [
      "events.1.resId",
      "links.href",
      "links.method",
      "links.response"
    ]
  },
  "details": [
    {
      "message": "\"resId\" is required",
      "path": [ "events", 1, "resId" ],
      "type": "any.required",
      "context": {
        "key": "resId",
        "label": "resId"
      }
    },
    {
      "message": "\"href\" must be a valid uri",
      "path": [ "links", "href" ],
      "type": "string.uri",
      "context": {
        "value": "asdf",
        "key": "href",
        "label": "href"
      }
    },
    {
      "message": "\"method\" must be one of [GET, POST, PUT]",
      "path": [ "links", "method" ],
      "type": "any.allowOnly",
      "context": {
        "value": "franz",
        "valids": [ "GET", "POST", "PUT" ],
        "key": "method",
        "label": "method"
      }
    },
    {
      "message": "\"response\" with value \"herbert\" fails to match the required pattern: /^testOida$/",
      "path": [ "links", "response" ],
      "type": "string.regex.base",
      "context": {
        "pattern": "/^testOida$/",
        "value": "herbert",
        "key": "response",
        "label": "response"
      }
    }
  ]
}

The detailed documentation about the possible errors, their properties and options see: https://github.com/hapijs/joi/blob/v14.3.0/API.md#list-of-errors

CORS

/config.js

module.exports = {
    name: 'serviceName',
    endpoints: {
        http: {
            port: 3000,

            // global server cors configuraton
            // see: https://hapijs.com/api#route-options rules apply here too
            cors: {
                // defaults to '*'
                origin: ['https://myui.myservice.at', 'http://lvh.me'],

                // allow additional headers to be sent when client XHR
                // lib is sending them like angular $http etc
                additionalHeaders: ['x-requested-with']
            },
        },
    },
};

Request Logger

/config.js

module.exports = {
    name: 'serviceName',
    endpoints: {
        http: {
            port: 3000,

            // request logger configuration
            requestLogger: {
                // enable the request logger
                enabled: false,

                // log full request body if content-type: application/javascript and multipart/form-data
                logFullRequest: true,

                // log full response if content-type: application/javascript
                logFullResponse: true,
            },
        },
    },
};

Logger

The atrix logger uses bunyan under the hood. For more info about bunyan streams have a look at the bunyan stream documentation.

/config.js

module.exports = {
    name: 'serviceName',
    logger: {
        level: 'debug',
        name: 'dummyDebugger', // optional, atrix would insert the services name if no logger name is provided
        streams: [], // optional, bunyan streams
    }
}

The logger can be accessed on the request object in every service handler.

/simple_GET.js

module.exports = (req, reply) => {
    req.log.debug('I am a debug message');
    req.log.info('I am an info message');
    req.log.warn('I am a warning message');
    req.log.info('I am a error message');
    reply({status: 'ok'});
};

Optionally, you can also access the logger of your service as it is exposed via atrix:

/service.js

const atrix = require('@trigo/atrix');

const service = atrix.addService({.name: 'dummyService', ...service configuration...});

// access directly using service instance
service.log.info('I am the dummyService logger');

// access through atrix 
atrix.service.dummyService.log.info('I am also the dummyService logger');

Settings

Add service settings in here. They are accessible in the handler as the "service.settings" object

/config.js

module.exports = {
    settings: {
        pika: 'chu',
    },
};

For example, if the service were to be called demoService, you could access its settings like this:

const atrix = ('@trigo/atrix');
const service = atrix.services.demoService;

const pikaValue = service.settings.pika;

Or in every service handler

module.exports = (req, res, service) => {
    req.log.info(`Value of Pika is ${service.settings.pika}`);
}

Upstream

Atrix uses axios for HTTP requests and can be configured for multiple upstreams. Upstreams will expose a simple interface to make preconfigured HTTP requests.

Basic Upstream

Example of a basic upstream configuration /config.js

module.exports = {
    upstream: {
        example: {
            url: 'http://some.url',
        },
    },
};

The defined upstream can be accessed in every service handler via the service parameter.

Example usage of upstream directly inside a service handler /simple_GET.js

module.exports = async (req, reply, service) => {
    const result = await service.upstream.example.get('/');
    req.log.info(result);
    reply({status: 'ok'});
};

Alternativ the upstreams can be accessed via the exposed service from atrix.

Example usage of upstream inside a module which is called from within the dummyService /some_file/which_is/part_of/the_service

const atrix = require('@trigo/atrix');
// here we assume the service has been named 'dummyService'
const service = atrix.dummyService;
const exampleUpstream = service.upstream.example;

Options

You can define options (e.g.: headers) which will be merged into the underlying fetch request.

Example configuration for upstream headers /config.js

module.exports = {
    upstream: {
        example: {
            url: 'http://some.url',
            options: {
                headers: {
                    'User-Agent': 'ATRIX_SERVICE',
                },
            },
        },
    },
};

Retry

Upstreams can be configured to automatically retry the requests in case of an error for several times with a defined interval.

Example configuration for retry upstream /config.js

module.exports = {
    upstream: {
        example: {
            url: 'http://some.url',
            retry: {
                interval: 1000, // milliseconds
                max_tries: 3,
            },
        },
    },
};

Upstream Authentication

You can set up basic authentication or oAuth authentication which will be handled by the upstream itself.

Basic Authentication

Example configuration for a basic authentication upstream /config.js

module.exports = {
    upstream: {
        example: {
            url: 'http://some.url',
            security: {
                strategies: {
                    basic: {
                        username: 'username',
                        password: 'password',
                    },
                },
            },
        },
    },
};

OAuth Authentication

The OAuth strategy will try to authenticate against the provided authEndpoint and grantType via Basic authentication. The auth endpoint has to return a JSON answer contiaining an access_token.

// json answer e.g.:
{
    access_token: '123456'
}

After the initial configuration it is not necessary to authenticate manually - upstream will handle the authentication process on the first request and will cache the returning access_token for further requests.

Example configuration for a oauth authentication upstram /config.js

module.exports = {
    upstream: {
        example: {
            url: 'http://some.url',
            security: {
                strategies: {
                    oauth: {
                        clientId: 'client_id',
                        clientSecret: 'client_secret',
                        authEndpoint: 'http://auth.endpoint/token',
                        grantType: 'password',
                    },
                },
            },
        },
    },
};

Overwriting config via env variables

Every variable defined in the /config.js can be overwritten by declaring environment variables. Configurations that are not already defined in /config.js may not be declared by environment variables - especially arrays - you may not insert additional items to arrays...

They have to follow a strict pattern. The environment variable has to be defined in snakecased uppercased words eg. THIS_IS_AN_ENV_VAR. Starting with ATRIX, followed by the atrix service's name, which is defined by the new atrix.Service('demoService', config) call. For the demoService we would have to start with ATRIX_DEMOSERVICE_ as environment variable name.

/config.js

module.exports = {
    settings: {
        nestedSetting: {
            pika: 'chu',
        },
    },
};

To overwrite the value of pika we would have to define the env variable like that:

ATRIX_DEMOSERVICE_SETTINGS_NESTEDSETTING_PIKA=chuchu

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Version

7.0.0-alpha5

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  • trigo-admin
  • mdulghier
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