firstpass_proxy/
run.rs

1//! Server bootstrap shared by the `firstpass` and `firstpass-proxy` binaries: build state from
2//! config, open the trace store, and serve until Ctrl-C. Keeping this in the lib means both the
3//! unified CLI (`firstpass up`) and the bare proxy binary start the server the exact same way.
4
5use std::sync::Arc;
6
7use crate::gate::GateHealthRegistry;
8use crate::provider::ProviderRegistry;
9use crate::{AppState, ProxyConfig, app, store};
10
11/// Initialize the global tracing subscriber from `RUST_LOG` (default `info`). Called by the
12/// binaries, not the library internals.
13pub fn init_tracing() {
14    tracing_subscriber::fmt()
15        .with_env_filter(
16            tracing_subscriber::EnvFilter::try_from_default_env()
17                .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info")),
18        )
19        .init();
20}
21
22/// Register a default error budget for every gate named across enforce routes: auto-disable a gate
23/// whose abstain rate exceeds 25% over its last 50 runs (SPEC §7.2).
24#[must_use]
25pub fn build_gate_health(config: &ProxyConfig) -> GateHealthRegistry {
26    let mut gate_health = GateHealthRegistry::new();
27    if let Some(routing) = config.routing.as_ref() {
28        let mut seen = std::collections::HashSet::new();
29        for route in &routing.routes {
30            for gate in route.gates.iter().chain(&route.deferred_gates) {
31                if seen.insert(gate.clone()) {
32                    gate_health = gate_health.with_budget(gate.clone(), 50, 0.25);
33                }
34            }
35        }
36    }
37    gate_health
38}
39
40/// Open the trace store, build [`AppState`], and serve the HTTP proxy until Ctrl-C.
41///
42/// # Errors
43/// Returns any error from opening the store, building the HTTP client, binding the listener, or
44/// serving.
45pub async fn serve(config: ProxyConfig) -> Result<(), Box<dyn std::error::Error>> {
46    let (traces, writer) = store::open(&config.db_path)?;
47    let bind = config.bind.clone();
48    let providers = ProviderRegistry::new(&config.upstream_anthropic, &config.upstream_openai);
49    let gate_health = build_gate_health(&config);
50
51    let state = AppState {
52        config: Arc::new(config),
53        // Observe passthrough may stream SSE, so only bound the CONNECT phase here — a total or
54        // read timeout would sever a long-lived stream. (The enforce providers, which never stream
55        // through the adapter, carry a full request timeout — see `ProviderRegistry::new`.)
56        http: reqwest::Client::builder()
57            .connect_timeout(std::time::Duration::from_secs(10))
58            .build()?,
59        providers,
60        gate_health: Arc::new(gate_health),
61        traces,
62    };
63
64    let listener = tokio::net::TcpListener::bind(&bind).await?;
65    tracing::info!(%bind, "firstpass listening");
66    tracing::info!("offboard: unset ANTHROPIC_BASE_URL");
67
68    axum::serve(listener, app(state)?)
69        .with_graceful_shutdown(shutdown_signal())
70        .await?;
71
72    // Dropping `traces` (via `state`, already out of scope) closes the channel; wait for the
73    // writer to flush and exit before the process ends.
74    drop(writer);
75    Ok(())
76}
77
78async fn shutdown_signal() {
79    if let Err(err) = tokio::signal::ctrl_c().await {
80        tracing::warn!(%err, "failed to install Ctrl-C handler; shutting down anyway");
81    }
82}
firstpass_proxy/run.rs

firstpass_proxy/
run.rs
