rob thijssen
cabec1d08a
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The true-streaming SSE passthrough (Body::from_stream, no full-response buffering, with chunk-observation hooks) was cortex-only. helexa-router (#69) needs the same mechanism to proxy a chat-completions/messages stream verbatim to a selected cortex. Extract it once. New `crates/helexa-stream` owns the *mechanism* (kept HTTP-free cortex-core untouched — it would have forced axum/reqwest/futures onto every cortex-core consumer): - `forward_streaming(client, url, headers, body, observer)` — POST and stream the response back chunk-for-chunk; status-agnostic, so a non-2xx (e.g. cortex 429) is passed through with status+headers intact (the #69 backpressure-passthrough requirement). - `ChunkObserver` trait + `ObservedStream` wrapper — feeds each chunk to the observer, calls `finish` exactly once on clean end or on drop (client disconnect). - `BodyTail` (bounded tail accumulator) + `last_count_for` (trailing OpenAI `usage` extraction) — the reusable pieces an observer uses. cortex keeps its *policy*: `proxy.rs` now supplies a `CortexMetrics` observer (per-request token metrics + per-principal reservation settle), its logging contract, and the error envelope, driving the shared mechanism. `proxy::last_count_for` is re-exported so `handlers`/ `anthropic_sse` call sites are unchanged. No behaviour change — the existing cortex `streaming.rs` tests pass as-is. helexa-stream tests prove chunk-for-chunk incremental delivery, observer finish-once, usage extraction, and non-2xx passthrough. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01F6o3ddqmYNh9kzdwq6eowh