huskies: merge 554_story_multi_project_gateway_that_proxies_mcp_calls_to_per_project_docker_containers
This commit is contained in:
dave
@@ -0,0 +1,672 @@
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//! Multi-project gateway — proxies MCP calls to per-project Docker containers.
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//!
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//! When `huskies --gateway` is used, the server starts in gateway mode: it reads
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//! a `projects.toml` config that maps project names to container URLs, maintains
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//! an "active project" selection, and proxies all MCP tool calls to the active
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//! project's container. Gateway-specific tools allow switching projects, querying
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//! status, and aggregating health checks across all registered projects.
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use poem::EndpointExt;
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use poem::handler;
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use poem::http::StatusCode;
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use poem::web::Data;
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use poem::{Body, Request, Response};
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use reqwest::Client;
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use serde::{Deserialize, Serialize};
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use serde_json::{json, Value};
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use std::collections::BTreeMap;
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use std::path::Path;
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use std::sync::Arc;
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use tokio::sync::RwLock;
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// ── Config ───────────────────────────────────────────────────────────
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/// A single project entry in `projects.toml`.
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#[derive(Debug, Clone, Deserialize, Serialize)]
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pub struct ProjectEntry {
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/// Base URL of the project's huskies container (e.g. `http://localhost:3001`).
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pub url: String,
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}
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/// Top-level `projects.toml` config.
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#[derive(Debug, Clone, Deserialize, Serialize)]
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pub struct GatewayConfig {
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/// Map of project name → container URL.
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#[serde(default)]
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pub projects: BTreeMap<String, ProjectEntry>,
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}
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impl GatewayConfig {
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/// Load gateway config from a `projects.toml` file.
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pub fn load(path: &Path) -> Result<Self, String> {
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let contents = std::fs::read_to_string(path)
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.map_err(|e| format!("cannot read {}: {e}", path.display()))?;
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toml::from_str(&contents)
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.map_err(|e| format!("invalid projects.toml: {e}"))
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}
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}
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// ── Gateway state ────────────────────────────────────────────────────
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/// Shared gateway state threaded through HTTP handlers.
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#[derive(Clone)]
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pub struct GatewayState {
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/// The parsed gateway config with all registered projects.
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pub config: GatewayConfig,
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/// The currently active project name.
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pub active_project: Arc<RwLock<String>>,
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/// HTTP client for proxying requests to project containers.
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pub client: Client,
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}
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impl GatewayState {
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/// Create a new gateway state from a config. The first project in the config
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/// becomes the active project by default.
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pub fn new(config: GatewayConfig) -> Result<Self, String> {
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if config.projects.is_empty() {
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return Err("projects.toml must define at least one project".to_string());
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}
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let first = config.projects.keys().next().unwrap().clone();
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Ok(Self {
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config,
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active_project: Arc::new(RwLock::new(first)),
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client: Client::new(),
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})
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}
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/// Get the URL of the currently active project.
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async fn active_url(&self) -> Result<String, String> {
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let name = self.active_project.read().await.clone();
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self.config
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.projects
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.get(&name)
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.map(|p| p.url.clone())
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.ok_or_else(|| format!("active project '{name}' not found in config"))
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}
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}
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// ── MCP proxy handler ────────────────────────────────────────────────
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/// JSON-RPC request (duplicated here to keep the gateway self-contained).
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#[derive(Deserialize)]
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struct JsonRpcRequest {
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jsonrpc: String,
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id: Option<Value>,
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method: String,
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#[serde(default)]
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params: Value,
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}
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/// JSON-RPC response.
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#[derive(Serialize)]
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struct JsonRpcResponse {
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jsonrpc: &'static str,
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#[serde(skip_serializing_if = "Option::is_none")]
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id: Option<Value>,
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#[serde(skip_serializing_if = "Option::is_none")]
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result: Option<Value>,
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#[serde(skip_serializing_if = "Option::is_none")]
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error: Option<JsonRpcError>,
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}
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#[derive(Serialize)]
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struct JsonRpcError {
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code: i64,
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message: String,
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}
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impl JsonRpcResponse {
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fn success(id: Option<Value>, result: Value) -> Self {
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Self { jsonrpc: "2.0", id, result: Some(result), error: None }
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}
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fn error(id: Option<Value>, code: i64, message: String) -> Self {
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Self { jsonrpc: "2.0", id, result: None, error: Some(JsonRpcError { code, message }) }
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}
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}
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fn to_json_response(resp: JsonRpcResponse) -> Response {
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let body = serde_json::to_vec(&resp).unwrap_or_default();
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Response::builder()
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.status(StatusCode::OK)
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.header("Content-Type", "application/json")
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.body(Body::from(body))
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}
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/// Gateway-specific MCP tools exposed alongside the proxied tools.
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const GATEWAY_TOOLS: &[&str] = &["switch_project", "gateway_status", "gateway_health"];
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/// Main MCP POST handler for the gateway. Intercepts gateway-specific tools and
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/// proxies everything else to the active project's container.
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#[handler]
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pub async fn gateway_mcp_post_handler(
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req: &Request,
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body: Body,
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state: Data<&Arc<GatewayState>>,
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) -> Response {
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let content_type = req.header("content-type").unwrap_or("");
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if !content_type.is_empty() && !content_type.contains("application/json") {
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return to_json_response(JsonRpcResponse::error(
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None, -32700, "Unsupported Content-Type; expected application/json".into(),
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));
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}
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let bytes = match body.into_bytes().await {
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Ok(b) => b,
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Err(_) => return to_json_response(JsonRpcResponse::error(None, -32700, "Parse error".into())),
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};
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let rpc: JsonRpcRequest = match serde_json::from_slice(&bytes) {
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Ok(r) => r,
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Err(_) => return to_json_response(JsonRpcResponse::error(None, -32700, "Parse error".into())),
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};
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if rpc.jsonrpc != "2.0" {
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return to_json_response(JsonRpcResponse::error(rpc.id, -32600, "Invalid JSON-RPC version".into()));
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}
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// Accept notifications silently.
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if rpc.id.is_none() || rpc.id.as_ref() == Some(&Value::Null) {
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if rpc.method.starts_with("notifications/") {
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return Response::builder()
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.status(StatusCode::ACCEPTED)
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.body(Body::empty());
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}
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return to_json_response(JsonRpcResponse::error(None, -32600, "Missing id".into()));
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}
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match rpc.method.as_str() {
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"initialize" => to_json_response(handle_initialize(rpc.id)),
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"tools/list" => {
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// Merge gateway tools with proxied tools from the active project.
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match merge_tools_list(&state, rpc.id.clone()).await {
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Ok(resp) => to_json_response(resp),
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Err(e) => to_json_response(JsonRpcResponse::error(rpc.id, -32603, e)),
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}
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}
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"tools/call" => {
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let tool_name = rpc.params
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.get("name")
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.and_then(|v| v.as_str())
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.unwrap_or("");
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if GATEWAY_TOOLS.contains(&tool_name) {
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to_json_response(handle_gateway_tool(tool_name, &rpc.params, &state).await)
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} else {
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// Proxy to active project's container.
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match proxy_mcp_call(&state, &bytes).await {
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Ok(resp_body) => Response::builder()
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.status(StatusCode::OK)
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.header("Content-Type", "application/json")
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.body(Body::from(resp_body)),
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Err(e) => to_json_response(JsonRpcResponse::error(
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rpc.id, -32603, format!("proxy error: {e}"),
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)),
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}
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}
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}
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_ => {
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// Proxy unknown methods too.
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match proxy_mcp_call(&state, &bytes).await {
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Ok(resp_body) => Response::builder()
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.status(StatusCode::OK)
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.header("Content-Type", "application/json")
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.body(Body::from(resp_body)),
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Err(e) => to_json_response(JsonRpcResponse::error(
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rpc.id, -32603, format!("proxy error: {e}"),
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)),
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}
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}
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}
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}
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/// GET handler — method not allowed (matches the regular MCP endpoint behavior).
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#[handler]
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pub async fn gateway_mcp_get_handler() -> Response {
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Response::builder()
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.status(StatusCode::METHOD_NOT_ALLOWED)
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.body(Body::empty())
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}
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// ── Protocol handlers ────────────────────────────────────────────────
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fn handle_initialize(id: Option<Value>) -> JsonRpcResponse {
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JsonRpcResponse::success(
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id,
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json!({
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"protocolVersion": "2025-03-26",
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"capabilities": { "tools": {} },
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"serverInfo": {
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"name": "huskies-gateway",
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"version": "1.0.0"
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}
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}),
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)
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}
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/// Gateway tool definitions.
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fn gateway_tool_definitions() -> Vec<Value> {
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vec![
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json!({
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"name": "switch_project",
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"description": "Switch the active project. All subsequent MCP tool calls will be proxied to this project's container.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"project": {
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"type": "string",
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"description": "Name of the project to switch to (must exist in projects.toml)"
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}
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},
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"required": ["project"]
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}
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}),
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json!({
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"name": "gateway_status",
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"description": "Show pipeline status for the active project by proxying the get_pipeline_status tool call.",
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"inputSchema": {
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"type": "object",
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"properties": {}
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}
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}),
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json!({
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"name": "gateway_health",
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"description": "Health check aggregation across all registered projects. Returns the health status of every project container.",
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"inputSchema": {
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"type": "object",
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"properties": {}
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}
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}),
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]
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}
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/// Fetch tools/list from the active project and merge in gateway tools.
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async fn merge_tools_list(
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state: &GatewayState,
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id: Option<Value>,
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) -> Result<JsonRpcResponse, String> {
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let url = state.active_url().await?;
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let mcp_url = format!("{}/mcp", url.trim_end_matches('/'));
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let rpc_body = json!({
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"jsonrpc": "2.0",
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"id": 1,
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"method": "tools/list",
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"params": {}
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});
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let resp = state.client
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.post(&mcp_url)
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.json(&rpc_body)
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.send()
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.await
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.map_err(|e| format!("failed to reach {mcp_url}: {e}"))?;
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let resp_json: Value = resp.json().await
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.map_err(|e| format!("invalid JSON from upstream: {e}"))?;
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let mut tools: Vec<Value> = resp_json
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.get("result")
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.and_then(|r| r.get("tools"))
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.and_then(|t| t.as_array())
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.cloned()
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.unwrap_or_default();
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// Prepend gateway-specific tools.
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let mut all_tools = gateway_tool_definitions();
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all_tools.append(&mut tools);
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Ok(JsonRpcResponse::success(id, json!({ "tools": all_tools })))
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}
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/// Proxy a raw MCP request body to the active project's container.
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async fn proxy_mcp_call(
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state: &GatewayState,
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request_bytes: &[u8],
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) -> Result<Vec<u8>, String> {
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let url = state.active_url().await?;
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let mcp_url = format!("{}/mcp", url.trim_end_matches('/'));
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let resp = state.client
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.post(&mcp_url)
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.header("Content-Type", "application/json")
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.body(request_bytes.to_vec())
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.send()
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.await
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.map_err(|e| format!("failed to reach {mcp_url}: {e}"))?;
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resp.bytes()
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.await
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.map(|b| b.to_vec())
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.map_err(|e| format!("failed to read response from {mcp_url}: {e}"))
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}
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// ── Gateway-specific tools ───────────────────────────────────────────
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/// Dispatch a gateway-specific tool call.
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async fn handle_gateway_tool(
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tool_name: &str,
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params: &Value,
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state: &GatewayState,
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) -> JsonRpcResponse {
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let id = None; // The caller wraps this in a proper response.
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match tool_name {
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"switch_project" => handle_switch_project(params, state).await,
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"gateway_status" => handle_gateway_status(state).await,
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"gateway_health" => handle_gateway_health(state).await,
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_ => JsonRpcResponse::error(id, -32601, format!("Unknown gateway tool: {tool_name}")),
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}
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}
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/// Switch the active project.
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async fn handle_switch_project(params: &Value, state: &GatewayState) -> JsonRpcResponse {
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let project = params
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.get("arguments")
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.and_then(|a| a.get("project"))
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.or_else(|| params.get("project"))
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.and_then(|v| v.as_str())
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.unwrap_or("");
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if project.is_empty() {
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return JsonRpcResponse::error(None, -32602, "missing required parameter: project".into());
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}
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if !state.config.projects.contains_key(project) {
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let available: Vec<&str> = state.config.projects.keys().map(|s| s.as_str()).collect();
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return JsonRpcResponse::error(
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None, -32602,
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format!("unknown project '{project}'. Available: {}", available.join(", ")),
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);
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}
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*state.active_project.write().await = project.to_string();
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let url = &state.config.projects[project].url;
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JsonRpcResponse::success(
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None,
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json!({
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"content": [{
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"type": "text",
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"text": format!("Switched to project '{project}' ({})", url)
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}]
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}),
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)
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}
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/// Show pipeline status for the active project by proxying `get_pipeline_status`.
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async fn handle_gateway_status(state: &GatewayState) -> JsonRpcResponse {
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let active = state.active_project.read().await.clone();
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let url = match state.active_url().await {
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Ok(u) => u,
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Err(e) => return JsonRpcResponse::error(None, -32603, e),
|
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};
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|
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let mcp_url = format!("{}/mcp", url.trim_end_matches('/'));
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let rpc_body = json!({
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"jsonrpc": "2.0",
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"id": 1,
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"method": "tools/call",
|
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"params": {
|
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"name": "get_pipeline_status",
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"arguments": {}
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}
|
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});
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|
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match state.client.post(&mcp_url).json(&rpc_body).send().await {
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Ok(resp) => {
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match resp.json::<Value>().await {
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Ok(upstream) => {
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// Extract the result from the upstream response and wrap it.
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let pipeline = upstream.get("result").cloned().unwrap_or(json!(null));
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JsonRpcResponse::success(
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None,
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json!({
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"content": [{
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"type": "text",
|
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"text": format!(
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"Pipeline status for '{active}':\n{}",
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serde_json::to_string_pretty(&pipeline).unwrap_or_default()
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)
|
||||
}]
|
||||
}),
|
||||
)
|
||||
}
|
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Err(e) => JsonRpcResponse::error(None, -32603, format!("invalid upstream response: {e}")),
|
||||
}
|
||||
}
|
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Err(e) => JsonRpcResponse::error(None, -32603, format!("failed to reach {mcp_url}: {e}")),
|
||||
}
|
||||
}
|
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|
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/// Aggregate health checks across all registered projects.
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async fn handle_gateway_health(state: &GatewayState) -> JsonRpcResponse {
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let mut results = BTreeMap::new();
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|
||||
for (name, entry) in &state.config.projects {
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let health_url = format!("{}/health", entry.url.trim_end_matches('/'));
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let status = match state.client.get(&health_url).send().await {
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Ok(resp) => {
|
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if resp.status().is_success() {
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"healthy".to_string()
|
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} else {
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format!("unhealthy (HTTP {})", resp.status().as_u16())
|
||||
}
|
||||
}
|
||||
Err(e) => format!("unreachable: {e}"),
|
||||
};
|
||||
results.insert(name.clone(), status);
|
||||
}
|
||||
|
||||
let active = state.active_project.read().await.clone();
|
||||
JsonRpcResponse::success(
|
||||
None,
|
||||
json!({
|
||||
"content": [{
|
||||
"type": "text",
|
||||
"text": format!(
|
||||
"Health check (active: '{active}'):\n{}",
|
||||
results.iter()
|
||||
.map(|(name, status)| format!(" {name}: {status}"))
|
||||
.collect::<Vec<_>>()
|
||||
.join("\n")
|
||||
)
|
||||
}]
|
||||
}),
|
||||
)
|
||||
}
|
||||
|
||||
// ── Health aggregation endpoint ──────────────────────────────────────
|
||||
|
||||
/// HTTP GET `/health` handler for the gateway — aggregates health from all projects.
|
||||
#[handler]
|
||||
pub async fn gateway_health_handler(state: Data<&Arc<GatewayState>>) -> Response {
|
||||
let mut all_healthy = true;
|
||||
let mut statuses = BTreeMap::new();
|
||||
|
||||
for (name, entry) in &state.config.projects {
|
||||
let health_url = format!("{}/health", entry.url.trim_end_matches('/'));
|
||||
let healthy = match state.client.get(&health_url).send().await {
|
||||
Ok(resp) => resp.status().is_success(),
|
||||
Err(_) => false,
|
||||
};
|
||||
if !healthy {
|
||||
all_healthy = false;
|
||||
}
|
||||
statuses.insert(name.clone(), if healthy { "ok" } else { "error" });
|
||||
}
|
||||
|
||||
let body = json!({
|
||||
"status": if all_healthy { "ok" } else { "degraded" },
|
||||
"projects": statuses,
|
||||
});
|
||||
|
||||
let status = if all_healthy { StatusCode::OK } else { StatusCode::SERVICE_UNAVAILABLE };
|
||||
Response::builder()
|
||||
.status(status)
|
||||
.header("Content-Type", "application/json")
|
||||
.body(Body::from(serde_json::to_vec(&body).unwrap_or_default()))
|
||||
}
|
||||
|
||||
// ── Gateway server startup ───────────────────────────────────────────
|
||||
|
||||
/// Start the gateway HTTP server. This is the entry point when `--gateway` is used.
|
||||
pub async fn run(config_path: &Path, port: u16) -> Result<(), std::io::Error> {
|
||||
let config = GatewayConfig::load(config_path).map_err(std::io::Error::other)?;
|
||||
let state = GatewayState::new(config).map_err(std::io::Error::other)?;
|
||||
let state_arc = Arc::new(state);
|
||||
|
||||
let active = state_arc.active_project.read().await.clone();
|
||||
crate::slog!("[gateway] Starting gateway on port {port}, active project: {active}");
|
||||
crate::slog!(
|
||||
"[gateway] Registered projects: {}",
|
||||
state_arc.config.projects.keys().cloned().collect::<Vec<_>>().join(", ")
|
||||
);
|
||||
|
||||
let route = poem::Route::new()
|
||||
.at(
|
||||
"/mcp",
|
||||
poem::post(gateway_mcp_post_handler).get(gateway_mcp_get_handler),
|
||||
)
|
||||
.at("/health", poem::get(gateway_health_handler))
|
||||
.data(state_arc);
|
||||
|
||||
let host = std::env::var("HUSKIES_HOST").unwrap_or_else(|_| "127.0.0.1".to_string());
|
||||
let addr = format!("{host}:{port}");
|
||||
crate::slog!("[gateway] Listening on {addr}");
|
||||
|
||||
poem::Server::new(poem::listener::TcpListener::bind(&addr))
|
||||
.run(route)
|
||||
.await
|
||||
}
|
||||
|
||||
// ── Tests ────────────────────────────────────────────────────────────
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn parse_valid_projects_toml() {
|
||||
let toml_str = r#"
|
||||
[projects.huskies]
|
||||
url = "http://localhost:3001"
|
||||
|
||||
[projects.robot-studio]
|
||||
url = "http://localhost:3002"
|
||||
"#;
|
||||
let config: GatewayConfig = toml::from_str(toml_str).unwrap();
|
||||
assert_eq!(config.projects.len(), 2);
|
||||
assert_eq!(config.projects["huskies"].url, "http://localhost:3001");
|
||||
assert_eq!(config.projects["robot-studio"].url, "http://localhost:3002");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn parse_empty_projects_toml() {
|
||||
let toml_str = "[projects]\n";
|
||||
let config: GatewayConfig = toml::from_str(toml_str).unwrap();
|
||||
assert!(config.projects.is_empty());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn gateway_state_rejects_empty_config() {
|
||||
let config = GatewayConfig { projects: BTreeMap::new() };
|
||||
assert!(GatewayState::new(config).is_err());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn gateway_state_sets_first_project_active() {
|
||||
let mut projects = BTreeMap::new();
|
||||
projects.insert("alpha".into(), ProjectEntry { url: "http://a:3001".into() });
|
||||
projects.insert("beta".into(), ProjectEntry { url: "http://b:3002".into() });
|
||||
let config = GatewayConfig { projects };
|
||||
let state = GatewayState::new(config).unwrap();
|
||||
let active = state.active_project.blocking_read().clone();
|
||||
assert_eq!(active, "alpha"); // BTreeMap sorts alphabetically.
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn gateway_tool_definitions_has_expected_tools() {
|
||||
let defs = gateway_tool_definitions();
|
||||
let names: Vec<&str> = defs.iter()
|
||||
.filter_map(|d| d.get("name").and_then(|n| n.as_str()))
|
||||
.collect();
|
||||
assert!(names.contains(&"switch_project"));
|
||||
assert!(names.contains(&"gateway_status"));
|
||||
assert!(names.contains(&"gateway_health"));
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn switch_project_to_known_project() {
|
||||
let mut projects = BTreeMap::new();
|
||||
projects.insert("alpha".into(), ProjectEntry { url: "http://a:3001".into() });
|
||||
projects.insert("beta".into(), ProjectEntry { url: "http://b:3002".into() });
|
||||
let config = GatewayConfig { projects };
|
||||
let state = GatewayState::new(config).unwrap();
|
||||
|
||||
let params = json!({ "arguments": { "project": "beta" } });
|
||||
let resp = handle_switch_project(¶ms, &state).await;
|
||||
assert!(resp.result.is_some());
|
||||
|
||||
let active = state.active_project.read().await.clone();
|
||||
assert_eq!(active, "beta");
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn switch_project_to_unknown_project_fails() {
|
||||
let mut projects = BTreeMap::new();
|
||||
projects.insert("alpha".into(), ProjectEntry { url: "http://a:3001".into() });
|
||||
let config = GatewayConfig { projects };
|
||||
let state = GatewayState::new(config).unwrap();
|
||||
|
||||
let params = json!({ "arguments": { "project": "nonexistent" } });
|
||||
let resp = handle_switch_project(¶ms, &state).await;
|
||||
assert!(resp.error.is_some());
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn active_url_returns_correct_url() {
|
||||
let mut projects = BTreeMap::new();
|
||||
projects.insert("myproj".into(), ProjectEntry { url: "http://my:3001".into() });
|
||||
let config = GatewayConfig { projects };
|
||||
let state = GatewayState::new(config).unwrap();
|
||||
|
||||
let url = state.active_url().await.unwrap();
|
||||
assert_eq!(url, "http://my:3001");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn json_rpc_response_success_serializes() {
|
||||
let resp = JsonRpcResponse::success(Some(json!(1)), json!({"ok": true}));
|
||||
let s = serde_json::to_string(&resp).unwrap();
|
||||
assert!(s.contains("\"result\""));
|
||||
assert!(!s.contains("\"error\""));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn json_rpc_response_error_serializes() {
|
||||
let resp = JsonRpcResponse::error(Some(json!(1)), -32600, "bad".into());
|
||||
let s = serde_json::to_string(&resp).unwrap();
|
||||
assert!(s.contains("\"error\""));
|
||||
assert!(!s.contains("\"result\""));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn load_config_from_file() {
|
||||
let dir = tempfile::tempdir().unwrap();
|
||||
let path = dir.path().join("projects.toml");
|
||||
std::fs::write(&path, r#"
|
||||
[projects.test]
|
||||
url = "http://localhost:9999"
|
||||
"#).unwrap();
|
||||
|
||||
let config = GatewayConfig::load(&path).unwrap();
|
||||
assert_eq!(config.projects.len(), 1);
|
||||
assert_eq!(config.projects["test"].url, "http://localhost:9999");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn load_config_missing_file_fails() {
|
||||
let result = GatewayConfig::load(Path::new("/nonexistent/projects.toml"));
|
||||
assert!(result.is_err());
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user