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Publishing schemas to GraphOS

Using the Rover CLI


Whenever you make changes to a graph's , you should publish those changes to Apollo using the Rover CLI. Doing so ensures that Apollo always has an up-to-date understanding of your graph.

Prerequisites

  1. Install the Rover CLI.
  2. Authenticate Rover with .

Publish subgraph schemas

Every in includes one or more subgraphs. These are the individual GraphQL-powered microservices in your organization.

You individually publish each 's to Apollo with rover subgraph publish:

Example command
rover subgraph publish --schema ./products.graphql --name products docs-example-graph@current --routing-url https://products.example.com
rover subgraph publish
rover subgraph publish
rover subgraph publish
Products
subgraph
Reviews
subgraph
Inventory
subgraph
GraphOS

To publish a subgraph schema to Apollo:

  1. Identify the name of the you're publishing to. You can view the names of your existing subgraphs from your 's Subgraphs page in GraphOS Studio.

  2. If you're publishing a subgraph for the first time, also obtain the routing URL for that . This is the URL that your will use to communicate with the subgraph.

    • If already knows your 's routing URL, you don't need to provide this value unless you're changing it.
  3. Run the rover subgraph publish command and provide it your 's in one of the ways shown:

    # Provide a local .graphql file path
    rover subgraph publish my-graph@my-variant --name locations --routing-url https://flyby-locations-sub.herokuapp.com/ --schema ./schema.graphql
    # Provide an introspection result via stdin
    rover subgraph introspect http://localhost:4000 | rover subgraph publish my-graph@my-variant --name locations --routing-url https://flyby-locations-sub.herokuapp.com/ --schema -

Whenever you publish a , attempts to compose all latest versions of your s into a single supergraph schema for your :

(Composition succeeds)
Subgraph
schema
A
Subgraph
schema
B
Subgraph
schema
C
🛠
Composition
Supergraph schema
(A + B + C + routing machinery)

If this composition succeeds, your is updated with the result. This enables clients to query any newly added s, and it prevents them from querying any removed s.

You can manually fetch your 's latest with the rover supergraph fetch command, or retrieve it from your 's Schema > SDL page in Studio.

Publish monograph schemas

NOTE

These instructions apply only to monographs, which are not recommended.

  1. Decide how you'll provide your server's to . You can either:

    • Use a .gql or .graphql file saved on your local machine, or
    • Perform an query on your running server to fetch the
  2. Run the rover graph publish command, providing your in one of the ways shown:

    # Provide a local .graphql file path
    rover graph publish my-graph@my-variant --schema ./schema.graphql
    # Provide an introspection result via stdin
    rover graph introspect http://localhost:4000 | rover graph publish my-graph@my-variant --schema -

    As shown, the first positional you provide rover graph publish is a graph ref, a string that specifies a particular of a particular graph in .

Publish with continuous delivery

To get the most out of , you should publish each update to any production schema as soon as it occurs. Consequently, publishing should be part of your continuous delivery pipeline.

Here's a sample continuous delivery configuration for publishing in CircleCI:

version: 2
jobs:
build:
docker:
- image: circleci/node:8
steps:
- checkout
- run: npm install
- run:
name: Install Rover
command: |
# Download and install Rover
# This is pinned to a specific version for predictability in CI
curl -sSL https://rover.apollo.dev/nix/v0.8.1 | sh
# This allows the PATH changes to persist to the next `run` step
echo 'export PATH=$HOME/.rover/bin:$PATH' >> $BASH_ENV
# Start the GraphQL server. If a different command is used to
# start the server, use it in place of `npm start` here.
- run:
name: Starting server
command: npm start
background: true
# make sure the server has enough time to start up before running
# commands against it
- run: sleep 5
# When running on the 'main' branch, push the latest version
# of the schema to GraphOS.
- run: |
if [ "${CIRCLE_BRANCH}" == "main" ]; then
rover subgraph publish my-graph@my-variant \
--schema ./schema.graphql \
--name locations \
--routing-url https://products.example.com
fi
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