This repo is a proof of concept only

Chainlink NodeJS IPFS External Adapter

Send and get data from your IPFS node.

TODO

• Write tests
• Make text_for_file more robust (not allow one without the other)
• Any parameters can be passed instead of custom parameters

Creating your own adapter from this template

Clone this repo and change "ExternalAdapterProject" below to the name of your project

git clone https://github.com/PatrickAlphaC/ipfs_cl_ea

Enter into the newly-created directory

cd ipfs_cl_ea

See Install Locally for a quickstart

Input Params

This is currently a work in progress, and supports some of the IPFS HTTP parameters.

PRs are welcome :)

• endpoint: The endpoint to use from the IPFS API
• ipfs_host: The Base URL of you IPFS host
• starting_char: Which character to start at for returning the string

Parameters from the IPFS API:

  quiet: false,
  quieter: false,
  silent: false,
  progress: false,
  trickle: false,
  pin: false,
  file: false, // The location of the file you want to upload
  arg: false

Example input

curl -X POST -H "content-type:application/json" "http://localhost:8080/" --data '{ "id": 0, "data": {"file":"./test/test.json"}}'

Output

{
  "jobRunID":0,
  "data":{
    "Name":"test.json",
    "Hash":"Qmd3zUksep8MQnjeSsXgEE4xa2DKgw48HJPjk5BiMDn1u7",
    "Size":"24",
    "result":"Qmd3zUksep8MQnjeSsXgEE4xa2DKgw48HJPjk5BiMDn1u7"
  },
  "result":"Qmd3zUksep8MQnjeSsXgEE4xa2DKgw48HJPjk5BiMDn1u7",
  "statusCode":200
}

or

Example input

curl -X POST -H "content-type:application/json" "http://localhost:8080/" --data '{ "id": 0, "data": {"endpoint":"api/v0/cat", "arg":"Qmd3zUksep8MQnjeSsXgEE4xa2DKgw48HJPjk5BiMDn1u7"}}'

Output

{"jobRunID":0,"data":{"cat":"dog"},"statusCode":200}

Example Input

curl -X POST -H "content-type:application/json" "http://localhost--data '{ "id": 0, "data": {"text_for_file_name":"patrick.json", "text_for_file":"[\"dog\"]"}}'

Output

{"jobRunID":0,"data":{"Name":"patrick.json","Hash":"QmWk8NQVeoXyMizcxT3D2y85eFDQGQfmRvupCnni3nuS1q","Size":"15","result":"QmWk8NQVeoXyMizcxT3D2y85eFDQGQfmRvupCnni3nuS1q"},"result":"QmWk8NQVeoXyMizcxT3D2y85eFDQGQfmRvupCnni3nuS1q","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": {"file":"./test/test.json"}}'

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