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AI group chat with a GraphQL federated subscription and durable function

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// repository documentation

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AI group chat with:

- a GraphQL federated subscription for getting messages to the client
- a durable function for easily maintaining chat state and reliably coordinating with OpenAI

Built for GraphQL Summit 2024. See Summit [talk](https://youtu.be/_-uK4qHOodI) and [slides](http://bit.ly/summit-chat), and more info in [this post](https://temporal.io/blog/durable-execution-in-distributed-systems-increasing-observability) and [this talk](https://www.youtube.com/watch?v=AulAm5BtMXw&list=PL0MRiRrXAvRjMAfx42eiokiAmfclUX-6S&index=16).

**Contents:**

- [Code structure](#code-structure)
  - [Apps](#apps)
  - [Packages](#packages)
- [Set up](#set-up)
- [Run](#run)

## Code structure

Turborepo monorepo.

### Apps

- `apps/web` - Next.js client (subscription code: [`components/group-chat.tsx`](apps/web/components/group-chat.tsx))
- `apps/router` - Apollo router
- `apps/users-service` - subgraph that resolves the User entity (see [`index.ts`](apps/users-service/src/index.ts))
- `apps/messages-service` - subgraph that handles Subscriptions and proxies Queries and Mutations to the durable function ([`index.ts`](apps/messages-service/src/index.ts))
- `apps/worker` - runs the durable functions

### Packages

- `packages/common` - types generated from [messages schema](packages/common/src/messages.graphql) and supergraph schema
- `packages/durable-functions` - the `groupChat` durable function ([`index.ts`](packages/durable-functions/index.ts))
- `packages/activities` - normal functions called by the durable function, including AI SDK code that talks to OpenAI ([`index.ts`](packages/activities/index.ts))
- `packages/ui` - UI components
- `packages/eslint-config`
- `packages/typescript-config`

## Set up

```sh
brew install temporal
curl -sSL https://rover.apollo.dev/nix/latest | sh
git clone https://github.com/lorensr/ai-group-chat.git
cd ai-group-chat
npm i
```

Create a `.env` file at the project root with these values filled in:

```sh
APOLLO_KEY=
APOLLO_GRAPH_REF=
OPENAI_API_KEY=
```

The Apollo info must be from a free trial Enterprise account (until Apollo [releases](https://www.apollographql.com/blog/federated-subscriptions-in-graphos-real-time-data-at-scale#federated-subscriptions-with-graphos-cloud) federated subscriptions to GraphOS Cloud).

## Run

```sh
temporal server start-dev
```

```sh
npm run dev
```

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