Chainlink NodeJS Youtube External Adapter

Input Params

• endpoint: Default is "videos." Look at Youtube's API Reference. Other examples include "activities," "captions," and "search."
• id or tag: The ID that YouTube uses to uniquely identify the video (if you're using a different endpoint than "videos" then you need to see the API documentation).
• part: The object you want returned from the API response. eg. "statistics"

Output example

{
   "jobRunID":0,
   "data":{
      "kind":"youtube#videoListResponse",
      "etag":"ngrRKllvPuwZPgSzsBvZNlCwAr0",
      "items":[
         {
            "kind":"youtube#video",
            "etag":"cJEcP6dQlWS2enZg0PHcrR6soQQ",
            "id":"4i75Dqbhjvw",
            "statistics":{
               "viewCount":"820",
               "likeCount":"51",
               "dislikeCount":"0",
               "favoriteCount":"0",
               "commentCount":"0"
            }
         }
      ],
      "pageInfo":{
         "totalResults":1,
         "resultsPerPage":1
      },
      "result":null
   },
   "result":null,
   "statusCode":200
}

Install Locally

Install dependencies:

yarn

Test

Run the local tests:

yarn test

Natively run the application (defaults to port 8080):

Run

yarn start

Call the external adapter/API server

curl -X POST -H "content-type:application/json" "http://localhost:8080/" --data '{ "id": 0, "data": { "part": "statistics", "tag": "4i75Dqbhjvw" } }'

Docker

If you wish to use Docker to run the adapter, you can build the image by running the following command:

docker build . -t external-adapter

Then run it with:

docker run -p 8080:8080 -it external-adapter:latest

Serverless hosts

After installing locally:

Create the zip

zip -r external-adapter.zip .

Install to AWS Lambda

• In Lambda Functions, create function
• On the Create function page:
  • Give the function a name
  • Use Node.js 12.x for the runtime
  • Choose an existing role or create a new one
  • Click Create Function
• Under Function code, select "Upload a .zip file" from the Code entry type drop-down
• Click Upload and select the external-adapter.zip file
• Handler:
  • index.handler for REST API Gateways
  • index.handlerv2 for HTTP API Gateways
• Add the environment variable (repeat for all environment variables):
  • Key: API_KEY
  • Value: Your_API_key
• Save

To Set Up an API Gateway (HTTP API)

If using a HTTP API Gateway, Lambda's built-in Test will fail, but you will be able to externally call the function successfully.

• Click Add Trigger
• Select API Gateway in Trigger configuration
• Under API, click Create an API
• Choose HTTP API
• Select the security for the API
• Click Add

To Set Up an API Gateway (REST API)

If using a REST API Gateway, you will need to disable the Lambda proxy integration for Lambda-based adapter to function.

• Click Add Trigger
• Select API Gateway in Trigger configuration
• Under API, click Create an API
• Choose REST API
• Select the security for the API
• Click Add
• Click the API Gateway trigger
• Click the name of the trigger (this is a link, a new window opens)
• Click Integration Request
• Uncheck Use Lamba Proxy integration
• Click OK on the two dialogs
• Return to your function
• Remove the API Gateway and Save
• Click Add Trigger and use the same API Gateway
• Select the deployment stage and security
• Click Add

Install to GCP

• In Functions, create a new function, choose to ZIP upload
• Click Browse and select the external-adapter.zip file
• Select a Storage Bucket to keep the zip in
• Function to execute: gcpservice
• Click More, Add variable (repeat for all environment variables)
  • NAME: API_KEY
  • VALUE: Your_API_key