apollo-router-plugin-creator
Guide for writing Apollo Router native Rust plugins. Use this skill when: (1) users want to create a new router plugin, (2) users want to add service hooks (router_service, supergraph_service, execution_service, subgraph_service), (3) users want to modify an existing router plugin, (4) users need to understand router plugin patterns or the request lifecycle. (5) triggers on requests like "create a new plugin", "add a router plugin", "modify the X plugin", or "add subgraph_service hook".
What this skill does
# Apollo Router Plugin Creator
Create native Rust plugins for Apollo Router.
## Request Lifecycle
```
┌────────┐ ┌────────────────┐ ┌────────────────────┐ ┌───────────────────┐ ┌─────────────────────┐
│ Client │ │ Router Service │ │ Supergraph Service │ │ Execution Service │ │ Subgraph Service(s) │
└────┬───┘ └────────┬───────┘ └──────────┬─────────┘ └─────────┬─────────┘ └──────────┬──────────┘
│ │ │ │ │
│ Sends request │ │ │ │
│──────────────────────────▶ │ │ │
│ │ │ │ │
│ │ Converts raw HTTP request to GraphQL/JSON request │ │ │
│ │──────────────────────────────────────────────────────▶ │ │
│ │ │ │ │
│ │ │ Initiates query plan execution │ │
│ │ │───────────────────────────────────▶ │
│ │ │ │ │
│ │ │ ┌par [Initiates sub-operation]───────┐
│ │ │ │ │ │ │
│ │ │ │ │ Initiates sub-operation │ │
│ │ │ │ │────────────────────────────▶ │
│ │ │ │ │ │ │
│ │ │ ├[Initiates sub-operation]╌╌╌╌╌╌╌╌╌╌╌┤
│ │ │ │ │ │ │
│ │ │ │ │ Initiates sub-operation │ │
│ │ │ │ │────────────────────────────▶ │
│ │ │ │ │ │ │
│ │ │ ├[Initiates sub-operation]╌╌╌╌╌╌╌╌╌╌╌┤
│ │ │ │ │ │ │
│ │ │ │ │ Initiates sub-operation │ │
│ │ │ │ │────────────────────────────▶ │
│ │ │ │ │ │ │
│ │ │ └────────────────────────────────────┘
│ │ │ │ │
│ │ │ Assembles and returns response │ │
│ │ ◀╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌│ │
│ │ │ │ │
│ │ Returns GraphQL/JSON response │ │ │
│ ◀╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌│ │ │
│ │ │ │ │
│ Returns HTTP response │ │ │ │
◀╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌│ │ │ │
│ │ │ │ │
┌────┴───┐ ┌────────┴───────┐ ┌──────────┴─────────┐ ┌─────────┴─────────┐ ┌──────────┴──────────┐
│ Client │ │ Router Service │ │ Supergraph Service │ │ Execution Service │ │ Subgraph Service(s) │
└────────┘ └────────────────┘ └────────────────────┘ └───────────────────┘ └─────────────────────┘
```
## Service Hooks
### Service Overview
| Service | Description |
|----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `router_service` | Runs at the very beginning and very end of the HTTP request lifecycle.For example, JWT authentication is performed within the RouterService.Define router_service if your customization needs to interact with HTTP context and headers. It doesn't support access to the body property Related in Backend & APIs
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