Gas price service

Serverless lambda function that continuously fetches recommended gas prices from EthGasStation and stores then in a dynamoDB table, as well as providing a REST API for easy access and offline support.

This example demonstrates how to run a service locally, using the serverless-offline plugin. It provides a REST API to provide ethereum gas prices stored in a DynamoDB. A local DynamoDB instance is provided by the serverless-dynamodb-local plugin.

Test your service locally, without having to deploy it first. When you are satisfied with your testing, the lambda function and API gateway can be deployed with a single command.

Setup

First install the local dependencies and then kick off the local api and database server.

npm install
npm run offline

Test service offline

Call the getCosts function locally and navigate to http://localhost:3000/gas to get the data.

npm run local 

Subsequent local invokes should update the cost live from the ethgasstation api.

Deploy

Set up an additional aws profile under ~/.aws/credentials called gas.

[gas]
aws_access_key_id = ****************
aws_secret_access_key = ****************

Run the deploy script to setup your cloudformation stack.

npm run deploy 

After this is complete you will be provided with a public url and api gateway. Prices will be updated every minute.

To force an update, use the following command:

npm run invoke 

Cleanup

When done testing, if you'd like to tear down everything, simple run:

npm run destroy