AWS Lambda から AppSync の API を ぶん殴る https://blog.r3it.com/aws-lambda-to-appsync-1aa0c2f1da04

AppSyncInAwsLambda.js

require('isomorphic-fetch');
const AUTH_TYPE = require('aws-appsync/lib/link/auth-link').AUTH_TYPE;
const AWSAppSyncClient = require('aws-appsync').default;
const gql = require('graphql-tag');
const uuid = require('uuid/v4');

const newMessage = gql(`
  mutation createMessage($id: ID!, $content: String, $conversationId: ID!, $createdAt: String!) {
    createMessage(id: $id, content: $content, conversationId: $conversationId, createdAt: $createdAt){
      __typename
      conversationId
      createdAt
      id
      sender
      content
      isSent
    }
  }`);

exports.handler = async (event) => {
  const client = new AWSAppSyncClient({
    url: process.env['URL'],
    region: process.env['REGION'],
    auth: {
      type: AUTH_TYPE.API_KEY,
      apiKey: process.env['APIKEY']
    },
    disableOffline: true
  });

  const now = `${new Date().toISOString()}`;
  const id = `${now}_${uuid()}`;

  try {
    const result = await client.mutate({
      variables: {
        conversationId: "hello",
        content: 'こんにちは！！',
        createdAt: now,
        sender: 'AWS Lambda',
        isSent: false,
        id: id
      },
      mutation: newMessage
    });
    console.log(JSON.stringify(result));
    return result;
  } catch (err) {
    console.log(JSON.stringify(err));
    return err;
  }
};