52 lines
1.9 KiB
Rust
52 lines
1.9 KiB
Rust
//! Task-local session identifier for the requesting MCP client.
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//!
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//! Threaded ambiently through tool dispatch (same pattern as
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//! [`super::progress::EMITTER`]) so a deeply-nested handler — currently only
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//! `tool_prompt_permission` — can scope decisions per requesting agent
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//! without adding a parameter to `dispatch_tool_call` and every one of its
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//! ~40 match arms.
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//!
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//! The HTTP MCP handler installs the scope before dispatching a `tools/call`
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//! request, populated from the `X-Huskies-Session` header that per-story
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//! worktrees embed in their `.mcp.json` (see `worktree::write_mcp_json`).
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//! Callers with no header (the main interactive chat CLI, API-based runtimes
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//! that invoke `dispatch_tool_call` directly) fall back to a fixed
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//! `"default"` key — there is only ever one such session per server process,
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//! so no cross-story leakage results from sharing that bucket.
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/// Session key used when no `X-Huskies-Session` header was present.
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pub const DEFAULT_SESSION: &str = "default";
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tokio::task_local! {
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/// Set by the MCP HTTP handler before dispatching a `tools/call` request.
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/// Unset in tests and in non-HTTP dispatch paths, where [`current`] falls
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/// back to [`DEFAULT_SESSION`].
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pub static SESSION_ID: String;
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}
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/// Return the current request's session id, or [`DEFAULT_SESSION`] if no
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/// scope is installed.
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pub fn current() -> String {
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SESSION_ID
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.try_with(Clone::clone)
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.unwrap_or_else(|_| DEFAULT_SESSION.to_string())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[tokio::test]
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async fn current_falls_back_to_default_without_scope() {
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assert_eq!(current(), DEFAULT_SESSION);
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}
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#[tokio::test]
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async fn current_reads_installed_scope() {
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let value = SESSION_ID
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.scope("1218".to_string(), async { current() })
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.await;
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assert_eq!(value, "1218");
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}
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}
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