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In this article you’ll learn how to setup a Dgraph database with a lambda server.

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Dgraph Lambda

Dgraph Lambda is a serverless platform for running JavaScript with Dgraph. You can download the latest version or review the implementation in the repo.

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Running with Docker

To run a Dgraph Lambda server with Docker: 
docker run -it --rm -p 8686:8686 -v /path/to/script.js:/app/script/script.js -e DGRAPH_URL=http://host.docker.internal:8080 dgraph/dgraph-lambda
host.docker.internal doesn’t work on older versions of Docker on Linux. You can use DGRAPH_URL=http://172.17.0.1:8080 instead.

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Adding libraries

If you would like to add libraries to Dgraph Lambda, use webpack --target=webworker to compile your script.

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Working with TypeScript

You can import @slash-graphql/lambda-types to get types for addGraphQLResolver and addGraphQLMultiParentResolver.

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Dgraph Alpha

To set up Dgraph Alpha, you need to define the --graphql superflag’s lambda-url option, which is used to set the URL of the lambda server. All the @lambda fields are resolved through the lambda functions implemented on the given lambda server. For example: 
dgraph alpha --graphql lambda-url=http://localhost:8686/graphql-worker
Then test it out with the following curl command: 
curl localhost:8686/graphql-worker -H "Content-Type: application/json" -d '{"resolver":"MyType.customField","parent":[{"customField":"Dgraph Labs"}]}'

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Docker settings

If you’re using Docker, you need to add the --graphql superflag’s lambda-url option to your Alpha configuration. For example: 
command:
  /gobin/dgraph alpha --zero=zero1:5180 -o 100 --expose_trace --trace ratio=1.0
  --profile_mode block --block_rate 10 --logtostderr -v=2 --security
  whitelist=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16 --my=alpha1:7180 --graphql
  lambda-url=http://lambda:8686/graphql-worker
Next, you need to add the Dgraph Lambda server configuration, and map the JavaScript file that contains the code for lambda functions to the /app/script/script.js file. Remember to set the DGRAPH_URL environment variable to your Alpha server. Here’s a complete Docker example that uses the base Dgraph image and adds Lambda server support: 
services:
  dgraph:
    image: dgraph/standalone:latest
    environment:
      DGRAPH_ALPHA_GRAPHQL: "lambda-url=http://dgraph_lambda:8686/graphql-worker"
    ports:
      - "8080:8080"
      - "9080:9080"
      - "8000:8000"
    volumes:
      - dgraph:/dgraph

  dgraph_lambda:
    image: dgraph/dgraph-lambda:latest

    ports:
      - "8686:8686"
    environment:
      DGRAPH_URL: http://dgraph:8080
    volumes:
      - ./gql/script.js:/app/script/script.js:ro

volumes:
  dgraph: {}