Module stream 

Streaming LLM response wrapper.

This module provides LlmStreamWrapper, a Stream adapter that sits between the raw stream from an LLM API and the consumer. It feeds chunks to a user-supplied collector, and automatically emits lifecycle events when the stream ends.

Pipeline

raw chunk (Json) -> collector(chunk) -> Ok(()) -> yield chunk
                                     -> Err(e) -> terminate stream with error
upstream error -> terminate stream with error -> finalizer() -> Json -> SanitizeResponseGuardrails -> END event
stream ends -> finalizer() -> Json -> SanitizeResponseGuardrails -> END event

The collector receives each chunk (Json) and can accumulate state (e.g., concatenating tokens). If the collector returns Err, the stream terminates immediately with that error. Upstream stream errors also terminate the stream immediately. The finalizer is called once when the stream terminates and returns the aggregated response as Json. That aggregated response then flows through sanitize response guardrails before being included in the END event.

Structs

LlmStreamWrapper

Wraps an inner Stream<Item = Result<Json>> of raw chunks and: