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Enterprise application server for Node.js and Metarhia private cloud ⚡

Home Page: https://metarhia.com

License: MIT License

JavaScript 99.67% Shell 0.33%

nodejs application-server metarhia api websocket cloud scalable server cluster enterprise

impress's Introduction

Enterprise application server for Node.js: secure, lightweight, interactive, and scalable.

Description

First Node.js server scaled with multithreading and extra thin workload isolation. Optimized for high-intensive data exchange, rapid development, and clean architecture. Provides everything you need out of the box for reliable and efficient backend, network communication with web and mobile clients, protocol-agnostic API, run-time type validation, real-time and in-memory data processing, and reliable stateful services.

Weak sides: not a good choice for content publishing including blogs and online stores, server-side rendering, serving static content and stateless services.

Strong sides: security and architecture for enterprise-level applications, long-lived connections over websocket to minimize overhead for cryptographic handshake, no third-party dependencies.

Quick start

See project template: metarhia/Example
Start server with node server.js
See documentation and specifications

API endpoint example: application/api/example.1/citiesByCountry.js

async ({ countryId }) => {
  const fields = ['cityId', 'name'];
  const where = { countryId };
  const data = await db.select('City', fields, where);
  return { result: 'success', data };
};

You can call it from client-side:

const res = await metacom.api.example.citiesByCountry({ countryId: 3 });

Metarhia and impress application server way

Applied code needs to be simple and secure, so we use sandboxing with v8 isolated contexts, worker threads and javascript closures;
Domain code should be separated from system code; so we use DDD, layered (onion) architecture, DI, SOLID and GRASP principles, contract-based approach;
Impress supports stateful applications with RPC and client-session sticky to servers; microservices, centralized or distributed architecture;
No I/O is faster even than async I/O, so we hold state in memory, share it among multiple threads and use lazy I/O for persistent storage;
We use just internal trusted dependencies, no third-party npm packages; total Metarhia technology stack size is less than 2mb.

Features

API auto-routing calls to endpoint for rapid API development (no need to add routes manually)
API concurrency: request execution timeout and execution queue with both timeout and size limitations
Schemas for API contract, data structures validation, and domain models
Application server supports different API styles: RPC over AJAX and over Websocket, REST, and web hooks
Multiple protocols support: HTTP, HTTPS, WS, WSS
Auto loader with start hooks, namespace generation for code and dependencies
Live reload of code through filesystem watch
Graceful shutdown with stop hooks
Minimal dependencies and reduced code size
Layered architecture: api, domain logic, data access layer, and system code layer (hidden)
Code sandboxing for enhanced security and execution context isolation
Code protection: reference pollution prevention, prototype pollution prevention
Multi-threading for CPU utilization and execution isolation
Load balancing for simple scaling with redirection to multiple ports
Caching: in-memory caching for APIs and static files
Configuration: environment-specific application settings
Database access layer compatible with PostgreSQL with SQL-injection protection
Persistent sessions with authentication, groups, and anonymous sessions
Buffered logging (lazy write) with log rotation (keep logs N days) and console interface
Testing: integrated node.js native test runner and table-test support
Inter-process communication and shared memory used for state management
File utilities: upload, download, support for partial content and streaming
Task Management: scheduled task execution at specific intervals or certain times

TODO list

Those features will be implemented in nearest future (3-6 months):

Server health monitoring
Database migrations
State synchronization mechanism with transactions and subscription
Multi-tenancy support

Requirements

Node.js v18.x or v20.x
Linux (tested on Fedora v36-38, Ubuntu v18-23, CentOS v8-9)
Postgresql v11-16
OpenSSL v3 or later (optional, for https & wss)
certbot (recommended but optional)

License & Contributors

impress's People

Contributors

Stargazers

Watchers

Forkers

tblasv emav xgrommx contextworks maserg jayceefun strogo blacklizardsoft virtax kirill256 hellsingblack bhanuc marynaqa fily theelix devlato doving lbshackathon andreileman viktor-evdokimov topwood sensarg22 simexin haigecao maksimzavitaev skellla bianconeriamante ggd543 veslo1 dzyubspirit igorkalinchuk sherpic olewar sahbanagold itadapter appzk gandhigautam sashakarnaukh kochergan jbzhang99 wes1996118 nesdown o-rumiantsev guoyu07 behroozshafiabadi felixpitau tim-mcc ro9ueadmin derickwarshaw wlfsihua aqeelmoorad83 nikitavbv x0xa apapacy ykolomiets igorgo volland sterbur silvrwolfboy bogdantarasenko kontsedal diostaxis iroot nikolasmelui nazar32 pro100taa iulyus kybj77218914meizi vara855 guozanhua maximkokovin iarosb sacronux legioner9 sarnakov antihero yoricsv vkukh mike0712 sts0mrg0 craiqser krokoyr marhiievhe iuru2522 ranko95 pom4h eternal-rise varvadyk kostiari91 muturgan 3p511on makcimmushka yevhen-cx bemdev flipixwork gibson georgolden zaitsev-oleksii midomiddle sambrlon

impress's Issues

Strange encoding of client.fields when accessing from api.

I'm trying to get POST data from client.fields property and getting such string which cannot be parsed with JSON.parse:
{ '{"0":{"value":"alega","path":"services.list.1.0.header"},"1":{"value":"agafonov ': '',
'nbsp;","path":"services.list.1.1.header"}}': '' }
while client.data of the same post gives: {"0":{"value":"alega","path":"services.list.1.0.header"},"1":{"value":"agafonov ","path":"services.list.1.1.header"}}
which is ok for the parser.

падение при неверном доменном имени

допустим я у себя в hosts делаю запись
127.0.0.1 xn--127-qdd4dec.xn--p1ai
и захожу браузером соответственно на http://тест127.рф/
в applications/example/config/hosts.js остается как и было
module.exports = [
"127.0.0.1"
]
тогда сервер падает с таким сообщением

2014-01-29T21:54:19.252Z Master(7484/C1N0) TypeError: Cannot read property 'cache' of undefined; Client.include (\node_modules\impress\lib\impress.js:1037:23); Client.error (\node_modules\impress\lib\impress.js:898:9); Server.impress.dispatcher (\node_modules\impress\lib\impress.js:579:29); Server.EventEmitter.emit (events.js:98:17); HTTPParser.parser.onIncoming (http.js:2108:12); HTTPParser.parserOnHeadersComplete as onHeadersComplete; Socket.socket.ondata (http.js:1966:22); TCP.onread (net.js:525:27)

если конечно в applications/example/config/hosts.js сделать
module.exports = ["*"]
то работает и http://127.0.0.1/ и http://тест127.рф/
я так понимаю, что на левый домен страница с ошибкой все таки должна вылезать...

Create visual setup

Create visual setup for optional modules, plugings and configuration parameters.

[q] Url regexp routing

Let's imagine that I need urls like: http://example.com/<username>/profile which will point to folder profile and use get.js or post.js inside that folder and pass <username> as query string param or as a part of form data.
Can this framework do something like this?

Improve performance of Client

We can change mixin to class factory, to prepare special class for each application on server start or on config change and mixin additional methods to this class prototype but not to Client instances. This will increase performance I believe, but testing needed.

Fix installation errors for Ubuntu and Debian

In server deployment shell scripts

Fix error in mongodb installation
Fix error in adding to autorun

Startup check always return that server is already started

Startup check at https://github.com/tshemsedinov/impress/blob/master/lib/impress.js#L307 always goes in on('errror'), even if port is available and nothing is running on it.

странные попытки найти конфигурацию от корня диска в винде

вот я ковыряю импресс под виндой в каталоге C:\data\node\ws
соответственно ваш пример в C:\data\node\ws\applications\example
и конфиг в C:\data\node\ws\config
запустил из под отладчика вебшторма и увидел вот такие попытки найти конфиги в корне диска, но при этом однако все работает.... как то странно...

"C:\Program Files\nodejs\node.exe" --debug-brk=51320 server.js
debugger listening on port 51320
Impress Application Server starting, reading configuration
{ [Error: ENOENT, no such file or directory 'C:\config\cloud.js']
errno: 34,
code: 'ENOENT',
path: 'C:\config\cloud.js',
syscall: 'open' }
Startup check: http://127.0.0.1/
{ [Error: ENOENT, no such file or directory 'C:\config\cluster.js']
errno: 34,
code: 'ENOENT',
path: 'C:\config\cluster.js',
syscall: 'open' }
listen on 127.0.0.1:80
{ [Error: ENOENT, no such file or directory 'C:\config\log.js']
errno: 34,
code: 'ENOENT',
path: 'C:\config\log.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\config\plugins.js']
errno: 34,
code: 'ENOENT',
path: 'C:\config\plugins.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\config\servers.js']
errno: 34,
code: 'ENOENT',
path: 'C:\config\servers.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\config\sandbox.js']
errno: 34,
code: 'ENOENT',
path: 'C:\config\sandbox.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\databases.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\databases.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\application.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\application.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\example.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\example.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\files.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\files.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\hosts.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\hosts.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\mail.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\mail.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\routes.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\routes.js',
syscall: 'open' }
{ [Error: ENOENT, no such file or directory 'C:\example\config\sessions.js']
errno: 34,
code: 'ENOENT',
path: 'C:\example\config\sessions.js',
syscall: 'open' }

теряется соединение с БД

имеем приложение impress, базы mongodb и mysql
impress запущен через forever
после запуска работает нормально весь день (процесс разработки и отладки приложения), остается работающим на серверt и на следующий день начинаются проблемы - в обозреватель загружаются только статические файла (то, что в files.js).
запросы api не выполняются.

после рестарта - все работает

кусочки конфига:
cloud.js:
controller: "192.168.3.100",

cluster.js:
check: "http://192.168.3.100/"
strategy: "sticky",

plugins.js:
"db",
//"db.schema",
"db.mongodb",
//"db.memcached",
"db.mysql",
//"db.mysql.schema",
"impress.log",
"impress.security",
"impress.security.mongodb",
//"impress.mail",
"impress.uglify",
//"impress.health",
//"impress.cloud",
//"impress.geoip",
//"impress.websocket",
"impress.sse"

servers.js:
protocol: "http",
address: "192.168.3.100",
port: 80,
applications: ["agat", "iserv"],
nagle: true,
slowTime: "1s"

databases.js:
impress: {
url: "mongodb://localhost:27017/impress",
slowTime: "2s",
collections: ["sessions", "users", "groups"],
security: true
},
system: {
url: "mysql://root:123456789@localhost/agat",
slowTime: 1000,
tables: []
}

логи:
access.log - всегда отображаются все входящие запросы
debug.log - отображаются sql запросы, после появления ошибки - ничего не фиксируется

error.log:
2014-03-12T21:19:24.891Z Master(6242/C1N0) {"fatal":true,"code":"PROTOCOL_CONNECTION_LOST"}
2014-03-12T21:19:24.891Z Worker(6251/C1N3) {"fatal":true,"code":"PROTOCOL_CONNECTION_LOST"}
2014-03-12T21:19:24.893Z Worker(6249/C1N2) {"fatal":true,"code":"PROTOCOL_CONNECTION_LOST"}
2014-03-12T21:19:59.889Z Worker(6248/C1N1) {"fatal":true,"code":"PROTOCOL_CONNECTION_LOST"}

может быть, коннект отваливается по тайм-ауту при простое и при появлении новых запросов не поднимается...?

Add PostgreSQL driver as plugin

Probably this driver will be wrapped as plugin for db.js interface https://github.com/brianc/node-postgres

timezone && mysql

в качестве БД - mysql, сервер sles 11
для mysql и системы указана правильная временная зона
запросы к mysql из консоли (mysql) и MySQL Workbench возвращают правильные даты (тип datetime)

запросы из impress возвращают даты приведенные к UTC (на 4 часа меньше)
в результате получаются даты и неверным днем (это зависит от времени - если время = 00:00, вычитается 4 часа и получается вчерашний день)

в Node пока чайник, в результате поисков нашлось вот это:
process.env.TZ = 'Europe/Moscow';

прописал в один из обработчиков, но изменений нет

что нужно сделать, чтобы получать даты из запросов к mysql в соответствии с временной зоной?

Impress on linux on 80 port.

If you run impress that configured to listen on 80 port from non-root (non-privileged) user it will say that application is started successfully and is listening on 80 port. And logs will be empty.
But on linux non-root users can't open ports below 1024 for listening. So as a result application says that's all ok and it's runnning, but actually it can't listen on 80 port, so if I open i.e. http://127.0.0.1/ browser will show an error.

May be it will be better if impress somehow check if it actually can open that port, or at least show some warning about possible problems with ports below 1024.

GET parameters not included in rewrited url

For example.
Config:
"url": "/Test-1/GetPerson(.*)"
"rewrite": "/api/Test/GetPerson[1]",

Query http://someserver.com/Test-1/GetPerson?id=1
not routed to http://anotherserver.com/api/Test/GetPerson?id=1

But we have http://anotherserver.com/api/Test/GetPerson[1]

hmenu.everyone.template не отображается в примере

Зарегистрировался, вхожу с использованием формы логина. Ничего не происходит. Верхнее меню не меняется. В базе mongodb/impress пользователь зарегистрировался. Сессия есть.

Separate applications

Load separate config files for each application
Load each application in sandbox
Separate database access for different applications

How to create custom impress plugins (modules)?

I've installed example and it has only sites folder and config.js, server.js, setup.js. Now I need to create custom module (plugin) or override existing. I've tried one way: cloned impress from git, added test plugin into it and then configured my project to use impress from local git, not from npm. And this way worked. Is this right way to add custom modules to impress or may-be there is another way to do it?

очипятка в шаблонах примера: html.template

./applications/example/app/html.template
./applications/example/app/dbmi/html.template

24 <script type="text/javascropt" src="/js/eventsource.js"></script>

Sticky

Try to fix IP "sticky" serving strategy on windows or disable this strategy with warning and fall-back to "multiple" strategy if it is impossible.

Add new parameters to sessions.js

perIpLimit - Maximum session count to be created for one IP address
confirmTime - Expiration timeout after which session will live but password confirmation needed
expireTime - Expiration timeout after which session will be deleted
perUserLimit - Maximum session count to be created for one user account

Пожелание: Добавьте примеров и документацию

Пример, который идет в комплекте довольно сложный. Было бы неплохо, если бы были более простые примеры типа Hello World.

А документация на конфиги и основные модули была бы просто незаменима.

Remove .existsSync

Replace .existsSync to asynchronous analogs in API introspection implementation, see impress.js, lines: 1001, 1003

server starting problem on Mac

Fixed. Sory port 80 problem.

I start a server on mac os x 10.8.4.

And resive folowind errors:
TypeError: Cannot read property 'getsockname' of undefined
at net.js:1055:23
at Object.32:1 (cluster.js:587:5)
at handleResponse (cluster.js:171:41)
at respond (cluster.js:192:5)
at handleMessage (cluster.js:202:5)
at process.EventEmitter.emit (events.js:117:20)
at handleMessage (child_process.js:318:10)
at Pipe.channel.onread (child_process.js:345:11)
net.js:1055
if (port && handle.getsockname && port != handle.getsockname().port) {
^
TypeError: Cannot read property 'getsockname' of undefined
at net.js:1055:23
at Object.31:1 (cluster.js:587:5)
at handleResponse (cluster.js:171:41)
at respond (cluster.js:192:5)
at handleMessage (cluster.js:202:5)
at process.EventEmitter.emit (events.js:117:20)
at handleMessage (child_process.js:318:10)
at Pipe.channel.onread (child_process.js:345:11)

And so on.

On windows (same notebook) works good.

Detect no callback in handler

If handler (get.js, post.js, request.js, etc.) will not call function callback within timeout we should detect it, terminate connection and reply with error message.

Implement task scheduling

Scheduling for applications: single process, multiple processes on single server (cluster), multiple processes on multiple servers (cloud). No duplicate execution in multiple instances but with guaranted execution and restarting on fails.

Implement rewriting without regex expression (for example: (.*) on line end)

When we have
"routes": {
"Test1": {
"url": "/Test-0/GetPersons",
"rewrite": "/api/Test/GetPersons",
"host": "10.13.125.167",
"port": 81
}
}

//Test1 /Test-0/GetPersons(.) /api/Test/GetPersons 10.13.125.167 81
the rewrite engine not accept url, but when we change "url" option to "url": "/Test-0/GetPersons(.)" then all works fine.

Can you implement simple syntax when we not need (.*) at end of url.

Enhance plug-in infrastructure

Prepare plug-in pattern
Extract simple templating engine as plug-in
Make more examples and "howto" for plug-ins

Long processing handlers

Fork url-handlers as separate process for long processing.

Prevent log files creation

Do not create log files inside application if separate logging is OFF and logs will be empty.

[q] Impress i18n

Does Impress have it's own localization engine?
If it hasn't any i18n lib if I use some external library like https://github.com/mashpie/i18n-node will it work with Impress templates?

I can not run

F:\Impress>node server
Startup check: http://127.0.0.1/
Impress Application Server starting, reading configuration
listen on 127.0.0.1:80

events.js:72
throw er; // Unhandled 'error' event
^
Error: spawn ENOENT
at errnoException (child_process.js:980:11)
at Process.ChildProcess._handle.onexit (child_process.js:771:34)

F:\Impress>node -v
v0.10.18

TypeError: Cannot read property 'cache' of undefined;

on windows node 10.25 server creates above error

"Master(5500/C1N0) TypeError: Cannot read property 'cache' of undefined; \node_modules\impress\lib\impress.js:1336:17; Object.cb as oncomplete"

включение, выключение сайтов в конфигах

допустим я создаю в /applications каталог test
в /config/servers.js остается
applications: ["example"]

тем не менее impress при запуске этот test сразу грузит:
C:\data\node\ws>node server.js
�[32m�[1mImpress Application Server starting�[22m�[39m�[32m, reading configuration�[39m
open C:/data/node/ws/config/cloud.js
open C:/data/node/ws/config/cluster.js
open C:/data/node/ws/config/log.js
open C:/data/node/ws/config/plugins.js
open C:/data/node/ws/config/sandbox.js
open C:/data/node/ws/config/servers.js
�[32mStartup check: �[39mhttp://127.0.0.1/
listen on 127.0.0.1:80
open C:/data/node/ws/log/2014-01-30-access.log
open C:/data/node/ws/log/2014-01-30-error.log
open C:/data/node/ws/log/2014-01-30-debug.log
open C:/data/node/ws/log/2014-01-30-slow.log
open C:/data/node/ws/applications/example/config/application.js
open C:/data/node/ws/applications/example/config/databases.js
open C:/data/node/ws/applications/example/config/example.js
open C:/data/node/ws/applications/example/config/files.js
open C:/data/node/ws/applications/example/config/hosts.js
open C:/data/node/ws/applications/example/config/mail.js
open C:/data/node/ws/applications/example/config/routes.js
open C:/data/node/ws/applications/example/config/sessions.js
open C:/data/node/ws/applications/test/config/application.js
open C:/data/node/ws/applications/test/config/databases.js
open C:/data/node/ws/applications/test/config/files.js
open C:/data/node/ws/applications/test/config/hms.js
open C:/data/node/ws/applications/test/config/hosts.js
open C:/data/node/ws/applications/test/config/mail.js
open C:/data/node/ws/applications/test/config/routes.js
open C:/data/node/ws/applications/test/config/sessions.js

а если каталог test пустой падает:
2014-01-30T09:04:24.203Z Master(8804/C1N0) TypeError: Object.keys called on non-object; Function.keys (native); \node_modules\impress\lib\impress.js:154:26; ReaddirReq.Req.done (\node_modules\impress\node_modules\npm\node_modules\graceful-fs\graceful-fs.js:143:5); ReaddirReq.done (\node_modules\impress\node_modules\npm\node_modules\graceful-fs\graceful-fs.js:90:22); Object.oncomplete (fs.js:107:15)

Implement social networks auth

Implement authentication in social networks using Passport.js

Separate log files for applications

Separate log files for applications as optional feature. Allow to choice (for each application):

Global logging only
Global and separated logs
Separated logs only

Security problem: serving access.js as static file

In static folders or if access.js matched static regexp Impress serving is as a static file. This file includes no critical security information except flags and group names but should be fixed because we may want to hold real static code in /js/access.js to be executed at client side, so we have name overlapping.

Autorun

Start automatically during the system startup.
Become a service to be controlled from command line: service impress start|stop|restart|status.
Restart on errors is already implemented in following instantiation modes: "cluster", "multiple" and "specialization".

Cluster strategy "specialization"

Now implemented this way: multiple processes, one master and different workers for each server (master should not listen ports). On port 80 it works well, but on other ports session cookie "SID" and process identifier "node" cookie not works.

Cache memory limits

Implement cache memory limits with serving statistics to release less used resources.

Separate sandbox configuration

Now there is one sandbox configuration for all applications. We need to have separate configurations for each application with different access to namespaces.

Refactor all plugins to new conventions

New conventions:

pluginName.mixinApplication(application),
application.pluginName.mixinClient(client),
client.pluginName.init(callbackSuccess, callbackFail) or (err, callback)

TCP socket support

Implement raw tcp socket support for Impress-hosted applications

Template by group name problem

Detected problem: it seems that virtual group "everyone" is not applied for user if one have other group but we have no appropriate template for his group, in this case "everyone" template should be used but it does not.

Fix Linux service "update" and "restart" behavior

Commands "service impress update" and "service impress restart" now starts impress after update and after stop respectively, but this behavior is wrong, service/daemon state should become the same as it was before command execution.

падение при включенной mongodb

при включении в /config/plugins.js
"db.mongodb"
после запуска падает:

Impress Application Server starting, reading configuration
Exception in master process
TypeError: Cannot set property 'mongodb' of undefined
at global.db (/node_modules/impress/lib/db.mongodb.js:7:22)
at Object. (/node_modules/impress/lib/db.mongodb.js:43:3)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at loadPlugins (/node_modules/impress/lib/impress.js:227:17)
at /node_modules/impress/lib/impress.js:276:4
Impress shutting down

Extend Impress.health functionality

Consolidate and aggregate health data transmitting from workers to cluster and from cluster to Impress Cloud Controller. Create visualization interface for online and offline monitoring.

Другие движки шаблонов

Планируется ли добавить другие движки шаблонов? (например ejs, jade)

Add websocket support

It would be great if impress will support websokets.

And if you're planning to add it will it be your own implementation or you'll use something like socket.io or sockjs?
If you choose last may be you'll be interested in this library https://github.com/primus/primus. It acts like wrapper on many existing nodejs websocket implementations and allows easilly switch backends (like socket.io, engine.io and others) without rewriting your code.

Write line/pos of SyntaxError to log files

Example log file now, when SyntaxError occurs in handler(request.js, get/post.js, etc.): 2014-06-16T13:51:17.136Z Master(11260/C1N0) SyntaxError: Unexpected token :; new Script (vm.js:32:12); Function.Script.createScript (vm.js:48:10); impress.js:116:27; fs.js:266:14; Object.oncomplete (fs.js:107:15)

Fork long workers error

Fork works only from master thread, bur raise exception on worker threads:
worker AssertionError: false == true; Cluster.cluster.fork (cluster.js:505:3); Client.fork (\lib\impress.js:677:32);
Solution: call master thread by IPC and fork from master.

Implement self-testing mode

We need self-testing mode, so Application Server should run with special configuration key and execute internal testing for all functionality, log results and detect problems.