@eggjs/tegg-controller-plugin
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3.32.0 • Public • Published

@eggjs/tegg-controller-plugin

使用注解的方式来开发 egg 中的 Controller

Install

# tegg 注解
npm i --save @eggjs/tegg
# tegg 插件
npm i --save @eggjs/tegg-plugin
# tegg controller 插件
npm i --save @eggjs/tegg-controller-plugin

Prepare

// tsconfig.json
{
  "compilerOptions": {
    // 注解特性需要显示打开
    "experimentalDecorators": true
  }
}

Config

// config/plugin.js
exports.tegg = {
  package: '@eggjs/tegg-plugin',
  enable: true,
};

exports.teggController = {
  package: '@eggjs/tegg-controller-plugin',
  enable: true,
};

Usage

Middleware

Middleware 支持多个入参,依次传入要生效的中间件 中间件注解,可以添加在类/方法上。添加在类上时,对类上所有方法生效,添加在方法上时,只对当前方法生效。

// app/middleware/global_log.ts
import { Context } from 'egg';
import type { Next } from '@eggjs/controller-decorator';

export default async function globalLog(ctx: Context, next: Next) {
  ctx.logger.info('have a request');
  return next();
}

export default async function globalLog2(ctx: Context, next: Next) {
  ctx.logger.info('have a request2');
  return next();
}

// app/controller/FooController.ts
import { Middleware } from '@eggjs/tegg';
@Middleware(globalLog,globalLog2)
export class FooController {
  @Middleware(methodCount)
  
  async hello() {
  }
}

Context

当需要 egg context 时,可以使用 @Context 注解来声明。

// app/controller/FooController.ts
import { Context, EggContext } from '@eggjs/tegg';

export class FooController {
  @Middleware(methodCount)
  async hello(@Context() ctx: EggContext) {
  }
}

HTTP 注解

HTTPController/HTTPMethod

@HTTPController 注解用来声明当前类是一个 HTTP controller,可以配置路径前缀。 @HTTPMethod 注解用来声明当前方法是一个 HTTP method,只有带了这个注解,HTTP 方法才会被暴露出去,可以配置方法路径,

// app/controller/FooController.ts
import { Context, EggContext, HTTPController, HTTPMethod, HTTPMethodEnum } from '@eggjs/tegg';

@HTTPController({
  path: '/foo',
})
export class FooController {
  @HTTPMethod({
    method: HTTPMethodEnum.GET,
    path: '/hello',
  })
  async hello() {
  }
}

Param

HTTP 协议中有各种各样的传参方式,比如 query,path,body 等等。

HTTPBody

接收 body 参数

// app/controller/FooController.ts
import { Context, EggContext, HTTPController, HTTPMethod, HTTPMethodEnum, HTTPBody } from '@eggjs/tegg';

@HTTPController({
  path: '/foo',
})
export class FooController {
  @HTTPMethod({
    method: HTTPMethodEnum.GET,
    path: '/hello',
  })
  async hello(@HTTPBody() name: string) {
    return `hello, ${name}`;
  }
}
HTTPQuery/HTTPQueries

两者的区别在于参数是否为数组, HTTPQuery 只会取第一个参数,HTTPQueries 只提供数组形式。 HTTPQuery 的参数类型只能是 string, HTTPQueries 的参数类型只能是 string[]。

// app/controller/FooController.ts
import { Context, EggContext, HTTPController, HTTPMethod, HTTPMethodEnum, HTTPQuery, HTTPQueries } from '@eggjs/tegg';

@HTTPController({
  path: '/foo',
})
export class FooController {
  @HTTPMethod({
    method: HTTPMethodEnum.GET,
    path: '/hello',
  })
  async hello(
    // /foo/hello?name=bar
    // HTTPQuery: name=bar
    // HTTPQueries: name=[bar]
    @HTTPQuery() name: string,
    @HTTPQueries() names: string[],
  ) {
    return `hello, ${name}`;
  }
}

如果需要使用别名,比如说 query 中的 name 不能在 js 中声明时,如 foo[bar] 这类的。可以通过以下形式

@HTTPQuery({ name: 'foo[bar]' }) fooBar: string,
HTTPParam

接收 path 中的参数,类型只能为 string

// app/controller/FooController.ts
import { Context, EggContext, HTTPController, HTTPMethod, HTTPMethodEnum, HTTPBody } from '@eggjs/tegg';

@HTTPController({
  path: '/foo',
})
export class FooController {
  @HTTPMethod({
    method: HTTPMethodEnum.GET,
    path: '/:id',
  })
  async hello(@HTTPParam() id: string) {
    return `hello, ${name}`;
  }
}

如果需要使用别名,比如说 path 中使用正则声明 /foo/(.*), 可以通过以下形式

// 具体 name 值可以查看 path-to-regexp
@HTTPParam({ name: '0' }) id: string

Host

Host 注解,用于指定 HTTP 方法仅在 host 匹配时执行。 可以添加在类/方法上。添加在类上时,对类上所有方法生效,添加在方法上时,只对当前方法生效。方法上的注解可以覆盖类上的注解

// app/controller/FooController.ts
import { Host } from '@eggjs/tegg';
@Host('foo.eggjs.com')
export class FooController {
  // 仅能通过 foo.eggjs.com 访问
  async hello() {
  }

  // 仅能通过 bar.eggjs.com 访问
  @Host('bar.eggjs.com')
  async bar() {
  }
}

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Install

npm i @eggjs/tegg-controller-plugin

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Version

3.32.0

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