Tarantool Front-end Core

It's core module for admin UI. Any UI submodules should be register at core.

It has two parts. Lua part as rock that will be used at your project. JS part that will be compiled at Lua bundle. JS part based on React.

Architecture

Javascript

It's based on CRA. But with some details. Core is just a little React app that can route to correct module.

It can register a module in any time and route to it. This is main purpose.

Module can be described by module namespace, react root component and menu description, which can be described in two way(about it later).

Example of integration register a module:

``js
const core = window.tarantool_enterprise_core;
const RootComponent = () =>

`js
const matchPath = (path, link) => {
const point = link.indexOf(path)
return point === 0 && (link.length === path.length || link[path.length] === '/')
}

const selected = path => menuItem => ({
...menuItem,
expanded: menuItem.items.length > 0
?( menuItem.path === path ? !menuItem.expanded : menuItem.expanded)
: false,
})

const updateLink = path => menuItem => ({
...menuItem,
selected: matchPath(path, menuItem.path)
})

const defaultReducer = (defaultState = []) => (state = defaultState, {type, payload}) => {
console.log('default reducer', state, type, payload, defaultState)
switch (type) {
case constants.SELECT_MENU:
return state.map(selected(payload.path))
case '@@router/LOCATION_CHANGE':
return state.map(updateLink(payload.location.pathname))
case constants.RESET:
return defaultState.map(updateLink(payload.path))
default:
return state
}
}

`

Example of static menu:

`js
[{label: 'Module', path: '/module/'}]
`

Or can be described in more way:

`js
label: string,
path: string,
selected: boolean,
expanded: boolean,
loading: boolean,
items: [menuItem],
`

It's full state of menu item.

#### RootComponent

RootComponent can be any React Component. If you want using routing in module you should
using history from core component for menu updating.


Example with react-router-dom:

`js
class Root extends React.Component{
render() {
return (


Route should using same namespace of module. You should start all of your routes with /test.

You can use any technology inside that you want.

#### menuMiddleware

This is a redux middleware for dispatch some custom events or add reaction on your custom events.

It should be using if you want do async loading of menu elements or some another dynamic changes. Or you want dispatch action on menu events from other modules.

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Deprecated method. Arguments type same as new method.

#### menuMiddleware

This is a redux middleware for dispatch some custom events or add reaction on your custom events.

It should be using if you want do async loading of menu elements or some another dynamic changes. Or you want dispatch action on menu events from other modules.

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Throw error if module is already registered.

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Return registered modules.

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Show notification. Title and message are text of notification.

Type influence on view of notification.

Timeout is time in milliseconds for automatic hide notification. If timeout = 0. It's infinite time. You only can close it by your hands.

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Sets application name.

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Return unsubscribe function.

Subscribe to events of certain type. This can be used for cross module reaction.

callback(event) - event could be anything include null.

Example:

`js
const unwait = this.subscribe('registerModule', () => {
const modules = this.getModules().filter(x => x.namespace === namespace)
if (modules.length > 0) {
unwait();
resolve(true)
}
})
`

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It's for cross module reaction. You can dispatch anything that you want.

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Collection of React components working with frontend core.

Example:

AppTitle - sets application title

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Register axios handler. It's use a single responsibility chain inside. Handler should looks like:

`js
(r, next) => next(r + 1)
`

Handlers with negative priority will be called before handlers without priority.

More about context of usage [https://github.com/axios/axios#interceptors]. So request is request interceptor and requestError it's error on request. Also same for response with interceptors.response.

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You should use it for your axios instance for using same middlewares.

Example:

`
window.tarantool_enterprise_core.apiMethods.axiosWizard(axiosInstance)
`

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Register handler for Apollo. Handler should looks like it:

`js
(r, next) => next(r + 1)
`

* middleware runs before query;

* afterware handles successful responses;

* onError handles errors.

Handlers with negative priority will be called before handlers without priority.

More information here: [https://www.apollographql.com/docs/react/networking/network-layer/]

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Link middleware. Should use for working handlers.

Example of usage:

`js
import { from } from 'apollo-link'

new ApolloClient({
link: from([
window.tarantool_enterprise_core.apiMethods.apolloLinkMiddleware,
yourHttpLink,
])
})
`

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Link afterware. Should use for working handlers.

Example of usage:

`js
import { from } from 'apollo-link'

new ApolloClient({
link: from([
window.tarantool_enterprise_core.apiMethods.apolloLinkAfterware,
yourHttpLink,
])
})
`

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We add our analytic abstraction module. It support 2 types of event: Pageview and Action. By default it doesn't send any information.

You could send event with sendEvent and add own implementation of analytic by usage effect.

`js
window.tarantool_enterprise_core.analyticModule.sendEvent({
type: 'pageview',
url: 'https://tarantool.io'
})

const unsubscribe = window.tarantool_enterprise.analyticModule.effect((event) => {
axios.post('https://myanalytics.io', { pageview: event.url })
})

unsubscribe() // unsubscribe from effect
`


Typings:

`js
type Action = {
type: 'action',
action: string,
category: string,
label?: string,
value?: number
}

type PageView = {
type: 'pageview',
url: string
}

type AnalyticsEvent = Action | PageView

sendEvent(AnalyticsEvent)
effect(Function)
`

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Register page filter and return unsubscribe function.

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Filter out pages.

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Does page pass filters

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Object contains values passed from lua part.

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dispatchToken - transmits action to core redux store.

Example:
`js
window.tarantool_enterprise_core.dispatch('dispatchToken', { type: 'ADD_CLUSTER_USERS_MENU_ITEM' });
`

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setHeaderComponent - Header component was passed to frontend core.

core:pageFilter:apply - Emits on modifying page filters before applying. Provides an array of filtering functions.

core:pageFilter:applied - Emits on modifying page filters after applying. Provides an array of filtering functions.

Rock

Core module and other UI modules bundled as Lua files that contains bundle files.

`console
$ tarantoolctl rocks install frontend-core
$ tarantool -l pack-front - build/bundle.json build/bundle.lua
`

Command above make a bundle. Then it could be included as module at Tarantool Enterprise Admin.

Bundle usually contains a table

`lua
{
[filename] = {
is_entry = boolean,
body = string,
mime = string
},
...
}
`

- is_entry - indicate that's JS enter file of your module.
- body - content of file.
- mime - mime-type of file.
- filename - filename or filepath.

Lua

`lua
local http = require('http.server')
local httpd = http.new('0.0.0.0', '5050')
httpd:start()

local front = require('frontend-core')
front.init(httpd, {
enforce_root_redirect = false,
prefix = '/tarantool',
})
`

This start a Tarantool Enterprise Admin without modules.

You can register a module in this way:

`lua
local my_module_bundle = require('my_module.bundle')
front.add('module_namespace', my_module_bundle)
`

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httpd argument - should be an instance of a Tarantool HTTP server.

enforce_root_redirect - optional key which controls redirection to frontend-core app from '/' path, default true.

prefix - optional, adds path prefix to frontend-core app.

Register routes /admin/ and /static/, and redirect from / to /admin/ in httpd.

/admin/ - route for single page application admin module front-end.

/static/ - route for static files that will be used at application.

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namespace - using for namespace module. Should be same name as your JS namespace module.

bundle - a frontend bundle loaded as a lua table.

replace - if true, will replace exists module.

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Removes front-end module.

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Passes value from lua to browser's global object __tarantool_variables.

Example:
`lua
front.set_variable('authPath', 'https://sso.example.com')
front.set_variable('threshold', 42)
front.set_variable('editorParams', {smarttabs: true, padding: 2})
`

Development usage

You can use it in your frontend development mode with our npm package @tarantool.io/frontend-core, but you need use external react and react-dom from our package.

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npm i -s @tarantool.io/frontend-core

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`js
externals: {
react: 'react',
'react-dom': 'reactDom',
'@tarantool.io/frontend-core': 'tarantool_frontend_core_module',
'@tarantool.io/ui-kit': 'tarantool_frontend_ui_kit_module',
},
``

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We use plugin to bundle our static as Lua. Check it out here: https://github.com/tarantool/lua-bundler-webpack-plugin

Boilerplate

Stub project: https://github.com/tarantool/frontend-stub