serverless/docs/cn/providers/tencent/components/high-level-components/tencent-koa.md

Serverless Framework - Build web, mobile and IoT applications with serverless architectures using AWS Lambda, Azure Functions, Google CloudFunctions & more

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[![Serverless Koa Tencent Cloud](https://img.serverlesscloud.cn/20191226/1577361724216-koajs_width.png)](http://serverless.com)

## 简介

koa 组件通过使用 serverless-tencent 的基础组件如 API 网关组件，SCF 组件等，快速，方便的在腾讯云创建，配置和管理一个 [koa 框架](https://koajs.com/)。

## 快速开始

通过 koa 组件，对一个 koa 应用进行完整的创建，配置，部署和删除等操作。支持命令如下：

&nbsp;

1. [安装](#1-安装)
2. [创建](#2-创建)
3. [配置](#3-配置)
4. [部署](#4-部署)
5. [移除](#5-移除)

&nbsp;

### 1. 安装

通过 npm 安装 serverless

```bash
$ npm install -g serverless
```

### 2. 创建

本地创建 `serverless.yml` 文件和 `app.js`文件：

```bash
$ touch serverless.yml
```

初始化一个新的 npm 包，并安装 koa:

```bash
npm init              # 创建后持续回车
npm i --save koa  # 安装 koa
```

创建一个 `app.js`文件，并在其中创建您的 koa App：

```bash
$ touch app.js
```

```js
const koa = require('koa');
const app = new koa();

app.use(async (ctx, next) => {
  if (ctx.path !== '/') return next();
  ctx.body = 'Hello from Koa';
});

// don't forget to export!
module.exports = app;
```

### 3. 配置

在 serverless.yml 中进行如下配置

```yml
# serverless.yml

koa:
  component: '@serverless/tencent-koa'
  inputs:
    region: ap-shanghai
```

### 4. 部署

如您的账号未[登陆](https://cloud.tencent.com/login)或[注册](https://cloud.tencent.com/register)腾讯云，您可以直接通过`微信`扫描命令行中的二维码进行授权登陆和注册。

通过`sls`命令进行部署，并可以添加`--debug`参数查看部署过程中的信息

> 注：`sls`命令是`serverless`命令的缩写

```bash
$ sls --debug

  DEBUG ─ Resolving the template's static variables.
  DEBUG ─ Collecting components from the template.
  DEBUG ─ Downloading any NPM components found in the template.
  DEBUG ─ Analyzing the template's components dependencies.
  DEBUG ─ Creating the template's components graph.
  DEBUG ─ Syncing template state.
  DEBUG ─ Executing the template's components graph.
  DEBUG ─ Compressing function KoaComponent_7xRrrd file to /Users/dfounderliu/Desktop/temp/code/.serverless/KoaComponent_7xRrrd.zip.
  DEBUG ─ Compressed function KoaComponent_7xRrrd file successful
  DEBUG ─ Uploading service package to cos[sls-cloudfunction-ap-shanghai-code]. sls-cloudfunction-default-KoaComponent_7xRrrd-1572512568.zip
  DEBUG ─ Uploaded package successful /Users/dfounderliu/Desktop/temp/code/.serverless/KoaComponent_7xRrrd.zip
  DEBUG ─ Creating function KoaComponent_7xRrrd
  DEBUG ─ Created function KoaComponent_7xRrrd successful
  DEBUG ─ Starting API-Gateway deployment with name koa.TencentApiGateway in the ap-shanghai region
  DEBUG ─ Using last time deploy service id service-n0vs2ohb
  DEBUG ─ Updating service with serviceId service-n0vs2ohb.
  DEBUG ─ Endpoint ANY / already exists with id api-9z60urs4.
  DEBUG ─ Updating api with api id api-9z60urs4.
  DEBUG ─ Service with id api-9z60urs4 updated.
  DEBUG ─ Deploying service with id service-n0vs2ohb.
  DEBUG ─ Deployment successful for the api named koa.TencentApiGateway in the ap-shanghai region.

  koa:
    region:              ap-shanghai
    functionName:        KoaComponent_7xRrrd
    apiGatewayServiceId: service-n0vs2ohb
    url:                 http://service-n0vs2ohb-1300415943.ap-shanghai.apigateway.myqcloud.com/release/

  36s › koa › done

```

部署完毕后，可以在浏览器中访问返回的链接，看到对应的 koa 返回值。

### 5. 移除

通过以下命令移除部署的存储桶

```bash
$ sls remove --debug

  DEBUG ─ Flushing template state and removing all components.
  DEBUG ─ Removed function KoaComponent_MHrAzr successful
  DEBUG ─ Removing any previously deployed API. api-kf2hxrhc
  DEBUG ─ Removing any previously deployed service.  service-n0vs2ohb

  13s › koa › done
```

### 账号配置（可选）

当前默认支持 CLI 扫描二维码登录，如您希望配置持久的环境变量/秘钥信息，也可以本地创建 `.env` 文件

```bash
$ touch .env # 腾讯云的配置信息
```

在 `.env` 文件中配置腾讯云的 SecretId 和 SecretKey 信息并保存

如果没有腾讯云账号，可以在此[注册新账号](https://cloud.tencent.com/register)。

如果已有腾讯云账号，可以在[API 密钥管理](https://console.cloud.tencent.com/cam/capi)中获取 `SecretId` 和`SecretKey`.

```text
# .env
TENCENT_SECRET_ID=123
TENCENT_SECRET_KEY=123
```