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Named entrypoints #13861

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85 changes: 84 additions & 1 deletion content/workers/runtime-apis/bindings/service-bindings/rpc.md
Original file line number Diff line number Diff line change
Expand Up @@ -102,7 +102,90 @@ export default class extends WorkerEntrypoint {

## Named entrypoints

TODO: Example
You can also export any number of named `WorkerEntrypoint` classes from within a single Worker, in addition to the default export. You can then declare a Service binding to a specific named entrypoint.

You can use this to group multiple pieces of compute together. For example, you might create a distinct `WorkerEntrypoint` for each permission role in your application, and use these to provide role-specific RPC methods:

```toml
---
filename: wrangler.toml
---
name = "todo-app"

[[d1_databases]]
binding = "D1"
database_name = "todo-app-db"
database_id = "<unique-ID-for-your-database>"
```

```js
import { WorkerEntrypoint } from "cloudflare:workers";

export class AdminEntrypoint extends WorkerEntrypoint {
async createUser(username) {
await this.env.D1.prepare("INSERT INTO users (username) VALUES (?)")
.bind(username)
.run();
}

async deleteUser(username) {
await this.env.D1.prepare("DELETE FROM users WHERE username = ?")
.bind(username)
.run();
}
}

export class UserEntrypoint extends WorkerEntrypoint {
async getTasks(userId) {
return await this.env.D1.prepare(
"SELECT title FROM tasks WHERE user_id = ?"
)
.bind(userId)
.all();
}

async createTask(userId, title) {
await this.env.D1.prepare(
"INSERT INTO tasks (user_id, title) VALUES (?, ?)"
)
.bind(userId, title)
.run();
}
}

export default class extends WorkerEntrypoint {
async fetch(request, env) {
return new Response("Hello from my to do app");
}
}
```

You can bind to `AdminEntrypoint` and `UserEntrypoint` with a Service binding:
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```toml
---
filename: wrangler.toml
---
name = "admin-app"

[[services]]
binding = "ADMIN"
service = "todo-app"
entrypoint = "AdminEntrypoint"
```

```js
export default {
async fetch(request, env) {
await env.ADMIN.createUser("aNewUser");
return new Response("Hello from admin app");
},
};
```

You can learn more about how to configure D1 [here](/d1/get-started/#4-bind-your-worker-to-your-d1-database)
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You can try out a complete example of this to do app, as well as a Discord bot built with named entrypoints, by cloning the [cloudflare/js-rpc-and-entrypoints-demo repository](https://github.com/cloudflare/js-rpc-and-entrypoints-demo) from Github.

## Further reading

Expand Down
11 changes: 8 additions & 3 deletions content/workers/wrangler/configuration.md
Original file line number Diff line number Diff line change
Expand Up @@ -713,7 +713,7 @@ To bind Queues to your producer Worker, assign an array of the below object to t
- `binding` {{<type>}}string{{</type>}} {{<prop-meta>}}required{{</prop-meta>}}

- The binding name used to refer to the queue in your Worker. The binding must be [a valid JavaScript variable name](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Grammar_and_types#variables). For example, `binding = "MY_QUEUE"` or `binding = "productionQueue"` would both be valid names for the binding.

- `delivery_delay` {{<type>}}number{{</type>}} {{<prop-meta>}}optional{{</prop-meta>}}

- The number of seconds to [delay messages sent to a queue](/queues/reference/batching-retries/#delay-messages) for by default. This can be overridden on a per-message or per-batch basis.
Expand Down Expand Up @@ -762,7 +762,7 @@ To bind Queues to your consumer Worker, assign an array of the below object to t

- The maximum number of concurrent consumers allowed to run at once. Leaving this unset will mean that the number of invocations will scale to the [currently supported maximum](/queues/platform/limits/).
- Refer to [Consumer concurrency](/queues/reference/consumer-concurrency/) for more information on how consumers autoscale, particularly when messages are retried.

- `retry_delay` {{<type>}}number{{</type>}} {{<prop-meta>}}optional{{</prop-meta>}}

- The number of seconds to [delay retried messages](/queues/reference/batching-retries/#delay-messages) for by default, before they are re-delivered to the consumer. This can be overridden on a per-message or per-batch basis [when retrying messages](/queues/reference/batching-retries/#explicit-acknowledgement-and-retries).
Expand Down Expand Up @@ -889,6 +889,10 @@ To bind other Workers to your Worker, assign an array of the below object to the

- The name of the Worker.

- `entrypoint` {{<type>}}string{{</type>}} {{<prop-meta>}}optional{{</prop-meta>}}

- The name of the [entrypoint](content/workers/runtime-apis/bindings/service-bindings/rpc/#named-entrypoints) to bind to. If you do not provide a value, the default export of the Worker will be used.
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{{</definitions>}}

Example:
Expand All @@ -898,14 +902,15 @@ Example:
header: wrangler.toml
---
services = [
{ binding = "<BINDING_NAME>", service = "<WORKER_NAME>" }
{ binding = "<BINDING_NAME>", service = "<WORKER_NAME>", entrypoint = "<ENTRYPOINT_NAME>" }
]

# or

[[services]]
binding = "<BINDING_NAME>"
service = "<WORKER_NAME>"
entrypoint = "<ENTRYPOINT_NAME>"
```

### Analytics Engine Datasets
Expand Down
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