synapse-proxy 0.2.16

Config-driven reverse-proxy sidecar: path-prefix routing, static header injection, and streaming passthrough.
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//! End-to-end: the proxy forwards to a wiremock upstream with injected headers,
//! streams the response back, and returns the error contract on miss/failure.

use http_body_util::BodyExt;
use tower::ServiceExt; // oneshot
use wiremock::matchers::{header, method, path};
use wiremock::{Mock, MockServer, ResponseTemplate};

use synapse_proxy::build_router_from_config;
use synapse_proxy::config::Config;
use synapse_proxy::ProxyBuilder;

#[tokio::test]
async fn forwards_with_injected_header_and_streams_response() {
    let upstream = MockServer::start().await;
    Mock::given(method("POST"))
        .and(path("/chat"))
        .and(header("x-forwarded-by", "synapse-proxy"))
        .respond_with(ResponseTemplate::new(200).set_body_string("hello-from-upstream"))
        .mount(&upstream)
        .await;

    let cfg = Config::from_toml_str(&format!(
        r#"
        [[routes]]
        path_prefix = "/v1/llm"
        upstream = "{}"
        strip_prefix = true
        headers = {{ "x-forwarded-by" = "synapse-proxy" }}
    "#,
        upstream.uri()
    ))
    .unwrap();
    let app = build_router_from_config(ProxyBuilder::from_config(cfg)).unwrap();
    let resp = app
        .oneshot(
            axum::http::Request::builder()
                .method("POST")
                .uri("/v1/llm/chat")
                .body(axum::body::Body::from("ping"))
                .unwrap(),
        )
        .await
        .unwrap();
    assert_eq!(resp.status(), 200);
    let body = resp.into_body().collect().await.unwrap().to_bytes();
    assert_eq!(&body[..], b"hello-from-upstream");
}

#[tokio::test]
async fn unmatched_path_returns_404_no_route() {
    let cfg = Config::from_toml_str(
        r#"
        [[routes]]
        path_prefix = "/v1/llm"
        upstream = "http://127.0.0.1:1"
    "#,
    )
    .unwrap();
    let app = build_router_from_config(ProxyBuilder::from_config(cfg)).unwrap();
    let resp = app
        .oneshot(
            axum::http::Request::builder()
                .uri("/nope")
                .body(axum::body::Body::empty())
                .unwrap(),
        )
        .await
        .unwrap();
    assert_eq!(resp.status(), 404);
    let body = resp.into_body().collect().await.unwrap().to_bytes();
    let json: serde_json::Value = serde_json::from_slice(&body).unwrap();
    assert_eq!(json["error"], "no_route");
}

#[tokio::test]
async fn unreachable_upstream_returns_502_request_failed() {
    let cfg = Config::from_toml_str(
        r#"
        [[routes]]
        path_prefix = "/v1/llm"
        upstream = "http://127.0.0.1:1"
    "#,
    )
    .unwrap();
    let app = build_router_from_config(ProxyBuilder::from_config(cfg)).unwrap();
    let resp = app
        .oneshot(
            axum::http::Request::builder()
                .uri("/v1/llm/x")
                .body(axum::body::Body::empty())
                .unwrap(),
        )
        .await
        .unwrap();
    assert_eq!(resp.status(), 502);
    let body = resp.into_body().collect().await.unwrap().to_bytes();
    let json: serde_json::Value = serde_json::from_slice(&body).unwrap();
    assert_eq!(json["error"], "request_failed");
}