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Alosaur 🦖

Alosaur - Deno web framework 🦖.

test

  • Area - these are the modules of your application.
  • Controller - are responsible for controlling the flow of the application execution.
  • Middleware - provide a convenient mechanism for filtering HTTP requests entering your application.
  • Hooks - middleware for area, controller and actions. Have 3 cyclic life functions: onPreAction, onPostAction, onCatchAction
  • Decorators - for query, cookie, parametrs, routes and etc.
  • Dependency Injection - for all controllers by default from microsoft/TSyringe (more about alosaur injection).

Documentation


Examples

Simple example

Controller:

import { Controller, Get, Area, App } from 'https://deno.land/x/alosaur/mod.ts';

@Controller('/home')
export class HomeController {
    @Get('/text')
    text() {
        return 'Hello world';
    }
    @Get('/json')
    json() {
        return { text: 'test' };
    }
}

// Declare module
@Area({
    controllers: [HomeController],
})
export class HomeArea {}

// Create alosaur application
const app = new App({
    areas: [HomeArea],
});

app.listen();

tsconfig.app.json:

{
    "compilerOptions": {
        "experimentalDecorators": true,
        "emitDecoratorMetadata": true
    }
}

And run

deno run --allow-net --allow-read --config ./src/tsconfig.app.json app.ts


TODO

  • Add render views: Dejs and Handlebars

  • Add return value JSON

  • Add decorators:

    • @Area
    • @QueryParam
    • @Param param from url: /:id
    • @Body
    • @Cookie
    • @Req
    • @Res
    • @Middleware with regex route
    • @UseHook for contoller and actions
    • @Cache cache to actions {duration: number} number in ms
  • Add middleware

  • Add static middleware (example: app.useStatic)

  • Add CORS middleware

  • Add SPA middleware

  • Add DI

  • Add std exceptions

  • Add CI with minimal tests.

  • Add OpenAPI v3 generator (see /examples/basic/openapi.ts)

  • Add OpenAPI type reference

  • Add Hooks example

  • Add GraphQL

  • Add WebSocket

  • Add validators example class-validator

  • Add microservice connector with Wasm

  • Add benchmarks

  • Transfer to Alosaur github organization

  • Add docs and more examples

Plugins & modules

Examples

  • Add basic example
  • Add DI example
  • Add static serve example
  • Add Dejs view render example
  • Add example with SQL drivers (PostgreSQL)
  • Add basic example in Docker container
  • Add WebSockets example
  • Add example with Wasm

OpenAPI v3

Example in examples/basic/openapi.ts

Generate OpenAPI file:

deno run -A --config ./src/tsconfig.lib.json examples/basic/openapi.ts

Middleware

You can create middleware and register it in area or all application layer.

@Middleware(new RegExp('/'))
export class Log implements MiddlewareTarget<TState> {
    date: Date = new Date();

    onPreRequest(context: Context<TState>) {
        return new Promise((resolve, reject) => {
            this.date = new Date();
            resolve();
        });
    }

    onPostRequest(context: Context<TState>) {
        return new Promise((resolve, reject) => {
            console.log(new Date().getTime() - this.date.getTime());
            resolve();
        });
    }
}

Register in app settings

const settings: AppSettings = {
    areas: [HomeArea, InfoArea],
    middlewares: [Log],
};

or in app

const app = new App(settings);

app.use(/\//, new Log());

Hooks

Hooks - middleware for area, controller and actions with supports DI container.

Hook in Alosaur there are three types: onPreAction, onPostAction, onCatchAction.

type PayloadType = string; // can use any type for payload
type State = any;

export class MyHook implements HookTarget<State, PayloadType> {

  // this hook run before controller action
  onPreAction(context: Context<State>, payload: PayloadType) {
      // you can rewrite result and set request immediately
      context.response.result = Content({error: {token: false}}, 403);
      context.response.setImmediately();
      // if response setted immediately no further action will be taken
  };
  
  // this hook run after controller action
  onPostAction(context: Context<State>, payload: PayloadType) {
    // you can filtered response result here
  };
  
  // this hook run only throw exception in controller action
  onCatchAction(context: Context<State>, payload: PayloadType) {
  
  };
}

uses:

@UseHook(MyContollerHook) // or @UseHook(MyHook, 'payload') for all actions in controller
@Controller()
export class HomeController {

    @UseHook(MyHook, 'payload') // only for one action
    @Get('/')
    text(@Res() res: any) {
        return ``;
    }
}

Global error handler

Errors that haven’t been caught elsewhere get in here

const app = new App(
// app settings
);


// added global error handler
app.error((context: Context<any>, error: Error) => {
  context.response.result = Content("This page unprocessed error", (error as HttpError).httpCode || 500);
  context.response.setImmediately();
});

Action outputs: Content, View, Redirect

There are 3 ways of information output

https://github.com/alosaur/alosaur/tree/master/src/renderer

  • Content similar return {}; by default Status 200 OK
  • View uses with template engine, return View("index", model);
  • Redirect and RedirectPermanent status 301,302 return Redirect('/to/page')
return {}; // return 200 status

// or
return Content("Text or Model", 404); // return 404 status

// or 
return View("page", 404); // return 404 status

Transformers and validators

You can use different transformers

For example class-validator and class-transformer for body

post.model.ts:

import validator from "https://dev.jspm.io/class-validator@0.8.5";

const { Length, Contains, IsInt, Min, Max, IsEmail, IsFQDN, IsDate } =
  validator;

export class PostModel {
  @Length(10, 20)
  title?: string;

  @Contains("hello")
  text?: string;

  @IsInt()
  @Min(0)
  @Max(10)
  rating?: number;

  @IsEmail()
  email?: string;
}

app.ts

import validator from "https://dev.jspm.io/class-validator@0.8.5";
import transformer from "https://dev.jspm.io/class-transformer@0.2.3";
import { App, Area, Controller, Post, Body } from 'https://deno.land/x/alosaur/mod.ts';
import { PostModel } from './post.model.ts';

const { validate } = validator;
const { plainToClass } = transformer;

// Create controller
@Controller()
export class HomeController {

    @Post('/')
    async post(@Body(PostModel) data: PostModel) {

        return {
            data,
            errors: await validate(data)
        }
    }
}

// Declare controller in area
@Area({
    controllers: [HomeController],
})
export class HomeArea { }

// Create app
const app = new App({
    areas: [HomeArea],
});

// added tranform function
app.useTransform({
    type: 'body', // parse body params
    getTransform: (transform: any, body: any) => {
        return plainToClass(transform, body);
    }
})

// serve application
app.listen();

You can also use just a function instead of a transformer.

function parser(body): ParsedObject {
    // your code
    return body;
}

...
@Post('/')
post(@Body(parser) data: ParsedObject) {

}