arete-server 0.2.0

# arete-server

[![crates.io](https://img.shields.io/crates/v/arete-server.svg)](https://crates.io/crates/arete-server)
[![docs.rs](https://docs.rs/arete-server/badge.svg)](https://docs.rs/arete-server)
[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](LICENSE)

WebSocket server and projection handlers for Arete streaming pipelines.

## Overview

This crate provides a builder API for creating Arete servers that:

- Process Solana blockchain data via Yellowstone gRPC
- Parse and transform data using generated IDL parsers and the Arete VM
- Stream entity updates over WebSockets to connected clients
- Serve stack-scoped HTTP reads for `/chain/*` and `/programs/*`
- Support multiple streaming modes (State, List, Append)
- Monitor stream health and connectivity status

## Installation

```toml
[dependencies]
arete-server = "0.2"
```

## Quick Start

```rust
use arete_server::{Server, Spec};

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    Server::builder()
        .spec(my_spec())
        .websocket()
        .bind("[::]:8877".parse()?)
        .health_monitoring()
        .start()
        .await
}
```

### Auth Plugins

`arete-server` supports pluggable auth for both WebSocket connections and HTTP
read endpoints. By default, all connections and HTTP reads are allowed.
When WebSocket auth is configured, HTTP reads inherit that plugin unless an
HTTP-specific plugin is configured.

```rust
use std::sync::Arc;

use arete_server::{Server, StaticTokenAuthPlugin};

Server::builder()
    .spec(my_spec())
    .websocket()
    .websocket_auth_plugin(Arc::new(StaticTokenAuthPlugin::new([
        "dev-secret".to_string(),
    ])))
    .http_auth_plugin(Arc::new(StaticTokenAuthPlugin::new([
        "dev-secret".to_string(),
    ])))
    .start()
    .await?;
```

The built-in `StaticTokenAuthPlugin` accepts either:

- `Authorization: Bearer <token>`
- `?token=<token>` query param

For signed sessions, the same short-lived JWT can be used for both WebSocket
and HTTP read requests. HTTP reads use bearer-only transport.

### With Configuration

```rust
use arete_server::{Server, WebSocketConfig, HealthConfig};
use std::time::Duration;

Server::builder()
    .spec(my_spec())
    .websocket_config(WebSocketConfig {
        bind_addr: "[::]:8877".into(),
        max_clients: 1000,
        message_queue_size: 100,
    })
    .health_config(HealthConfig::new()
        .with_heartbeat_interval(Duration::from_secs(30))
        .with_health_check_timeout(Duration::from_secs(10)))
    .start()
    .await
```

## Architecture

```
┌─────────────────────┐
│  Yellowstone gRPC   │
└──────────┬──────────┘
           │
           ▼
┌─────────────────────┐
│  Vixen Runtime      │  ← Generated from IDL
└──────────┬──────────┘
           │
           ▼
┌──────────────────────┐
│  Arete VM       │  ← Processes bytecode
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│  Projector           │  ← Mutations → Frames
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│  BusManager          │  ← Pub/Sub routing
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│  WebSocket Server    │  ← Streams to clients
└──────────────────────┘
```

## Feature Flags

| Feature | Default | Description |
|---------|---------|-------------|
| `otel` | No | OpenTelemetry integration for metrics and distributed tracing |

## Health Monitoring

Built-in health monitoring tracks stream connectivity and detects issues:

- **Connection Status Tracking** - Monitors stream states (Connected, Disconnected, Reconnecting, Error)
- **Event Staleness Detection** - Warns when connected but not receiving events
- **Error Counting** - Tracks and logs error frequency for alerting
- **Connection Duration** - Records uptime for debugging stability issues

## Module Structure

```
arete-server/
├── src/
│   ├── lib.rs              # Server & ServerBuilder API
│   ├── bus.rs              # Event bus manager
│   ├── config.rs           # Configuration types
│   ├── runtime.rs          # Runtime orchestrator
│   ├── projector.rs        # Mutation → Frame transformation
│   ├── health.rs           # Health monitoring
│   ├── view/               # View registry & specs
│   └── websocket/          # WebSocket infrastructure
├── Cargo.toml
└── README.md
```

## Dependencies

- `tokio` - Async runtime
- `tokio-tungstenite` - WebSocket support
- `yellowstone-vixen` - Yellowstone gRPC integration
- `arete-interpreter` - Arete VM and bytecode

## License

Apache-2.0