mirror of
https://github.com/jxxghp/MoviePilot.git
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46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
"""SSE wire mapping and response lifecycle helpers."""
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import json
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from collections.abc import AsyncIterable, Iterable
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from typing import Any
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from fastapi.responses import StreamingResponse
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SSE_HEADERS = {
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"Cache-Control": "no-cache, no-transform",
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"Connection": "keep-alive",
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"X-Accel-Buffering": "no",
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}
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def encode_data_event(payload: dict[str, Any]) -> str:
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"""Encode an OpenAI-style unnamed SSE data event."""
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return f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
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def encode_named_event(event: str, payload: dict[str, Any]) -> str:
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"""Encode a named SSE event without applying a response envelope."""
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return (
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f"event: {event}\n"
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f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
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)
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def build_sse_response(
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content: AsyncIterable[str] | Iterable[str],
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*,
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headers: dict[str, str] | None = None,
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) -> StreamingResponse:
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"""Build a non-buffered SSE response and merge protocol-specific headers."""
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return StreamingResponse(
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content,
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media_type="text/event-stream",
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headers={**SSE_HEADERS, **(headers or {})},
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)
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def build_sse_error_response(payload: str) -> StreamingResponse:
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"""Build a one-event SSE error response using the common transport policy."""
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return build_sse_response(iter([payload]))
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