Tencent Websocket Serverless Component

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Introduction

Websocket Serverless Component for Tencent Cloud.

Content

1. Prepare
2. Install
3. Create
4. Configure
5. Deploy
6. Remove

1. Prepare

Initial Socket Project

create socket entry file app.js, it contains socket event handlers. Each handler takes two arguments, the first is the data passed in from the client, and the second is the socket object, which contains helpful data and methods.

// this function gets triggered on new connections
// if not provided, connections are successful by default
on('connect', async (data, socket) => {
  // the following data are available in the socket object
  // id represnets the connection id of a certain client
  const { id, event, send } = socket

  // you can return status codes directly
  return 200
})

// this function gets triggered whenever a client disconnects
// if not provided, disconnection is not handled
on('disconnect', async (data, socket) => {
  // e.g. business logic that removes connection ids from a db table
})

// this function gets triggered whenever a client sends data to the specified route
// in this example, you're handling the "message" route
// so clients need to send the following JSON data: { "route": "message", "data": { "foo": "bar" } }
on('message', async (data, socket) => {
  // you can send data to the connected client with the send() function
  await socket.send(data)
})

// this function gets triggered to handle any other data that is not handled above
on('default', async (data, socket) => {
  // you can also send data to a specific connection id (that you might have saved in a table)
  // this is very useful for a broadcasting functionality
  await socket.send(data)
})

2. Install

Install the Serverless Framework globally:

$ npm install -g serverless

3. Create

Just create the following simple boilerplate:

$ touch serverless.yml
$ touch .env           # your Tencent api keys

Add the access keys of a Tencent CAM Role with AdministratorAccess in the .env file, using this format:

# .env
TENCENT_SECRET_ID=XXX
TENCENT_SECRET_KEY=XXX

• If you don't have a Tencent Cloud account, you could sign up first.

4. Configure

# serverless.yml

MyComponent:
  component: '@serverless/tencent-websocket'
  inputs:
    region: ap-guangzhou
    functionName: socket-function
    code: ./
    functionConf:
      timeout: 10
      memorySize: 128
      environment:
        variables:
          TEST: vale
      vpcConfig:
        subnetId: ''
        vpcId: ''
    apigatewayConf:
      protocol: https
      environment: release

• More Options

5. Deploy

$ sls --debug

Notice: sls is short for serverless command.

6. Remove

$ sls remove --debug

More Components

Checkout the Serverless Components repo for more information.