this repo hosts various Apollo federation examples.
Install rover by running the following:
curl -sSL https://rover.apollo.dev/nix/latest | sh
Install router by running the following:
curl -sSL https://router.apollo.dev/download/nix/latest | sh
To compose an example, navigate to the example directory of your choice and run:
rover supergraph compose --config ./supergraph.yaml > supergraph.graphql
Some examples will fail to compose. This is intended if the example is meant to illustrate something breaking supergraph composition.
To see the composed supergraph for your chosen example, open the corresponding supergraph.graphql
To view the query plan using Apollo Router, navigate to the example directory of your choice and run:
rover supergraph compose --config ./supergraph.yaml > supergraph.graphql && ../../router --supergraph supergraph.graphql --dev
This will compose the supergraph schema for your example and start a Apollo Router using that supergraph schema running on http://localhost:4000/.
You can then make whatever queries you like against http://localhost:4000/. Note that the examples here will fail to resolve since the resolver endpoints are fake. You can view the query plan for your operation via the Apollo Sandbox query planner tab.
To view the query plan using Apollo Gateway, you will need to install the dependencies for the simple_gateway.
Navigate to the simple_gateway directory and run:
npm i
Once the dependencies have installed, navigate to the example directory of your choice and run:
rover supergraph compose --config ./supergraph.yaml > supergraph.graphql && node ../../simple_gateway
This will compose the supergraph schema for your example and start a Node.JS Apollo Gateway using that supergraph schema running on http://localhost:4001/.
You can then make whatever queries you like against http://localhost:4001/. Note that the examples here will fail to resolve since the resolver endpoints are fake. The query plan will be printed to the terminal.