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Hive Gateway (Node.js)
Now, let's tie it all together with the Hive Gateway, made by the awesome team, "TheGuild" over on GitHub.
First, let's create the node project with Nx:
nx g @nx/node:application
Install a few dependencies:
pnpm i @graphql-hive/gateway graphql-ws ws
Add a config in src/gateway.config.ts:
import { defineConfig, LogLevel } from '@graphql-hive/gateway';
export const gatewayConfig = defineConfig({
port: 8000,
supergraph: 'apps/gateway/supergraph.graphql',
logging: LogLevel.debug,
transportEntries: {
'*.http': {
options: {
subscriptions: {
kind: 'ws',
},
},
},
},
});
Let's add a few commands to this project, too:
...
"hive-gateway": {
"dependsOn": ["supergraph-compose"],
"executor": "nx:run-commands",
"options": {
"command": "node_modules/.bin/hive-gateway supergraph -c apps/gateway/src/gateway.config.ts"
}
},
"supergraph-compose": {
"executor": "nx:run-commands",
"options": {
"command": "rover supergraph compose --elv2-license=accept --config apps/gateway/supergraph.json --output apps/gateway/supergraph.graphql"
}
},
...
Add a supergraph config for supergraph.json:
{
"federation_version": "=2.9.0",
"subgraphs": {
"spells": {
"schema": {
"subgraph_url": "http://localhost:8080/query"
}
},
"messages": {
"schema": {
"subgraph_url": "http://localhost:8081"
}
},
"players": {
"schema": {
"subgraph_url": "http://localhost:8082/graphql"
}
}
}
}
Okay, let's test this out and run the subgraphs first:
nx run-many -t=serve -p player-service message-service spell-service
Now, let's run the gateway:
NOTE: rover CLI is required for this step.
nx run gateway:hive-gateway
You should be able to run and execute Subscriptions through the gateway! Nice! You've now got a polyglot federated supergraph with subscriptions!
If you'd like to see the code, check it out here: https://github.com/sutt0n/polyglot-fed-gql
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