feat(api): graphql subscriptions #148
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| @@ -0,0 +1,101 @@ | |||
| /* eslint-disable @typescript-eslint/no-non-null-assertion */ | |||
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Please make eslint-disable line specific as allowing no-non-null-assertions om the whole file removes the type-checking for accidentially created ones too.
libs/api/shared/src/lib/kernel/graphql/subscriptions/graphql-subscription.service.ts
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This PR introduces GraphQL subscriptions over Server Sent Events.
As we probably will have an event-driven architecture, we want to use the
EventBusfrom the@nestjs/cqrspackage. Subscription resolvers can hook into that event stream with theGraphQLSubscriptionServicewhich filters the event stream and converts it into anAsyncIterator(which is required for GraphQL subscriptions).Now, whenever any Domain emits
SomethingCreatedand some resolver creates a subscription resolver hooked intoSomethingCreated, it will get emitted over SSE. It is also possible to provide mappers, to map the event payload to a presentable model or filter the stream, e.g., if events are scoped for specific user roles or tenants.