df7dfbc280
Nuevo ClaudeFormatEmitter traduce eventos nativos al formato exacto
que produce Claude Code CLI: content_block_start/delta/stop, tool_result,
assistant snapshots, result con usage/cost, done.
- streaming/claude_format.py: ClaudeFormatEmitter + DualEmitter
- base.py: enriquecer eventos con tool_call_id, raw_output, tool_arguments
- engine.py: usage/cost en EXECUTION_COMPLETED
- routes.py: ?format=claude en /sessions/{id}/stream
- main.py: DualEmitter wiring (emite a ambos formatos)
El frontend puede consumir el stream sin cambios — mismos event types
que Claude Code CLI. El formato nativo sigue disponible para el dashboard.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
322 lines
12 KiB
Python
322 lines
12 KiB
Python
"""Claude Code CLI compatible SSE format emitter.
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Translates agenticSystem native events into the exact format that
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Claude Code CLI produces, so the frontend can consume them without
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any changes. Used via ?format=claude on the stream endpoint.
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Wire format: data: {json}\n\n (no event: or id: fields)
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"""
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from __future__ import annotations
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import asyncio
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import json
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import logging
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from typing import Any, AsyncIterator
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from .sse import EventType, SSEEmitter
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logger = logging.getLogger(__name__)
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class ClaudeFormatEmitter:
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"""Emits events in Claude Code CLI SSE format.
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Maintains per-session state to track block indices and
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accumulate content for assistant snapshots.
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"""
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def __init__(self) -> None:
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self._queues: dict[str, list[asyncio.Queue[str | None]]] = {}
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# Per-session state
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self._block_counter: dict[str, int] = {}
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self._text_block_open: dict[str, bool] = {}
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self._text_block_index: dict[str, int] = {}
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self._tool_block_index: dict[str, dict[str, int]] = {} # session -> {tool_call_id -> index}
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self._content_blocks: dict[str, list[dict[str, Any]]] = {}
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self._text_accumulator: dict[str, str] = {}
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def _next_index(self, session_id: str) -> int:
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idx = self._block_counter.get(session_id, 0)
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self._block_counter[session_id] = idx + 1
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return idx
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def _reset_session(self, session_id: str) -> None:
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self._block_counter[session_id] = 0
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self._text_block_open[session_id] = False
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self._text_block_index[session_id] = -1
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self._tool_block_index[session_id] = {}
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self._content_blocks[session_id] = []
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self._text_accumulator[session_id] = ""
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def _push(self, session_id: str, payload: dict[str, Any]) -> None:
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"""Push a formatted line to all subscribers of a session."""
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line = f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
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for q in self._queues.get(session_id, []):
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try:
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q.put_nowait(line)
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except asyncio.QueueFull:
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logger.warning("Claude SSE queue full for session %s", session_id[:8])
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def _close_text_block(self, session_id: str) -> None:
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"""Close the current open text block if any."""
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if self._text_block_open.get(session_id):
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idx = self._text_block_index[session_id]
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self._push(session_id, {
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"type": "stream_event",
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"event": {"type": "content_block_stop", "index": idx},
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})
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# Save accumulated text to content blocks
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text = self._text_accumulator.get(session_id, "")
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if text:
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self._content_blocks.setdefault(session_id, []).append({
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"type": "text", "text": text,
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})
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self._text_block_open[session_id] = False
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self._text_accumulator[session_id] = ""
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def _open_text_block(self, session_id: str) -> None:
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"""Open a new text block."""
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idx = self._next_index(session_id)
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self._text_block_index[session_id] = idx
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self._text_block_open[session_id] = True
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self._text_accumulator[session_id] = ""
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self._push(session_id, {
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"type": "stream_event",
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"event": {
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"type": "content_block_start",
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"index": idx,
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"content_block": {"type": "text", "text": ""},
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},
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})
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def _build_assistant_snapshot(self, session_id: str) -> dict[str, Any]:
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"""Build assistant message snapshot for reconciliation."""
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blocks = list(self._content_blocks.get(session_id, []))
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return {
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"type": "assistant",
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"message": {"content": blocks},
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"error": False,
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}
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async def emit(
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self,
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event_type: EventType,
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data: dict[str, Any],
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session_id: str,
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) -> None:
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"""Translate a native event into Claude Code CLI format."""
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if event_type == EventType.EXECUTION_STARTED:
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self._reset_session(session_id)
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self._push(session_id, {
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"type": "stream_event",
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"event": {"type": "message_start"},
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})
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elif event_type == EventType.AGENT_DELTA:
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delta_text = data.get("delta", "")
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tool_args = data.get("tool_arguments", "")
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tool_call_id = data.get("tool_call_id", "")
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if delta_text:
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# Text streaming
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if not self._text_block_open.get(session_id):
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self._open_text_block(session_id)
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idx = self._text_block_index[session_id]
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self._text_accumulator[session_id] = self._text_accumulator.get(session_id, "") + delta_text
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self._push(session_id, {
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"type": "stream_event",
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"event": {
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"type": "content_block_delta",
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"index": idx,
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"delta": {"type": "text_delta", "text": delta_text},
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},
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})
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elif tool_args and tool_call_id:
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# Tool input JSON streaming
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tool_indices = self._tool_block_index.get(session_id, {})
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idx = tool_indices.get(tool_call_id)
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if idx is not None:
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self._push(session_id, {
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"type": "stream_event",
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"event": {
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"type": "content_block_delta",
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"index": idx,
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"delta": {"type": "input_json_delta", "partial_json": tool_args},
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},
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})
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elif event_type == EventType.TOOL_STARTED:
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tool_name = data.get("tool", "unknown")
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tool_call_id = data.get("tool_call_id", "")
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# Close open text block
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self._close_text_block(session_id)
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# Open tool_use block
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idx = self._next_index(session_id)
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self._tool_block_index.setdefault(session_id, {})[tool_call_id] = idx
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self._push(session_id, {
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"type": "stream_event",
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"event": {
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"type": "content_block_start",
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"index": idx,
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"content_block": {
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"type": "tool_use",
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"name": tool_name,
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"id": tool_call_id,
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},
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},
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})
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elif event_type == EventType.TOOL_COMPLETED:
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tool_name = data.get("tool", "unknown")
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tool_call_id = data.get("tool_call_id", "")
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status = data.get("status", "completed")
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raw_output = data.get("raw_output", data.get("summary", ""))
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is_error = status == "failed"
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# Close tool_use block
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tool_indices = self._tool_block_index.get(session_id, {})
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idx = tool_indices.get(tool_call_id)
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if idx is not None:
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self._push(session_id, {
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"type": "stream_event",
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"event": {"type": "content_block_stop", "index": idx},
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})
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# Save tool_use to content blocks for snapshot
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self._content_blocks.setdefault(session_id, []).append({
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"type": "tool_use",
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"id": tool_call_id,
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"name": tool_name,
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"input": {},
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})
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# Emit tool_result
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content = data.get("error", raw_output) if is_error else raw_output
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self._push(session_id, {
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"type": "tool_result",
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"tool_use_id": tool_call_id,
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"content": content[:4000] if isinstance(content, str) else str(content)[:4000],
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"is_error": is_error,
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})
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# Emit assistant snapshot for reconciliation
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self._push(session_id, self._build_assistant_snapshot(session_id))
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elif event_type == EventType.EXECUTION_COMPLETED:
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# Close any open text block
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self._close_text_block(session_id)
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# Final assistant snapshot
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self._push(session_id, self._build_assistant_snapshot(session_id))
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# Result with usage
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usage = data.get("usage", {})
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self._push(session_id, {
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"type": "result",
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"is_error": False,
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"usage": {
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"input_tokens": usage.get("input_tokens", 0),
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"output_tokens": usage.get("output_tokens", 0),
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"cache_read_input_tokens": 0,
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"cache_creation_input_tokens": 0,
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},
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"total_cost_usd": data.get("total_cost_usd", 0),
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})
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# Done
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self._push(session_id, {"type": "done"})
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elif event_type == EventType.ERROR:
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error_msg = data.get("message", str(data.get("error", "Unknown error")))
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# Close any open block
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self._close_text_block(session_id)
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self._push(session_id, {
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"type": "result",
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"is_error": True,
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"result": error_msg,
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"usage": {"input_tokens": 0, "output_tokens": 0, "cache_read_input_tokens": 0, "cache_creation_input_tokens": 0},
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"total_cost_usd": 0,
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})
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self._push(session_id, {"type": "done"})
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# Ignore other event types (KEEPALIVE, SESSION_CREATED, SUBAGENT_ASSIGNED)
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async def subscribe(self, session_id: str) -> AsyncIterator[str]:
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"""Subscribe to Claude-format SSE events for a session."""
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queue: asyncio.Queue[str | None] = asyncio.Queue(maxsize=512)
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if session_id not in self._queues:
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self._queues[session_id] = []
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self._queues[session_id].append(queue)
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try:
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while True:
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try:
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line = await asyncio.wait_for(queue.get(), timeout=15.0)
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if line is None:
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break
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yield line
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except asyncio.TimeoutError:
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yield 'data: {"type":"keepalive"}\n\n'
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finally:
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if queue in self._queues.get(session_id, []):
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self._queues[session_id].remove(queue)
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def cleanup_session(self, session_id: str) -> None:
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"""Clean up session state and close subscribers."""
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for q in self._queues.get(session_id, []):
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try:
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q.put_nowait(None)
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except asyncio.QueueFull:
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pass
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self._queues.pop(session_id, None)
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self._block_counter.pop(session_id, None)
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self._text_block_open.pop(session_id, None)
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self._text_block_index.pop(session_id, None)
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self._tool_block_index.pop(session_id, None)
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self._content_blocks.pop(session_id, None)
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self._text_accumulator.pop(session_id, None)
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class DualEmitter:
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"""Wraps SSEEmitter (native) + ClaudeFormatEmitter.
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Agents call emit() and both formats are produced.
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Duck-type compatible with SSEEmitter.
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"""
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def __init__(self, native: SSEEmitter, claude: ClaudeFormatEmitter) -> None:
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self.native = native
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self.claude = claude
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async def emit(
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self,
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event_type: EventType,
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data: dict[str, Any],
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session_id: str,
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) -> None:
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await self.native.emit(event_type, data, session_id)
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await self.claude.emit(event_type, data, session_id)
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# Delegate native SSE methods for backward compatibility
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async def subscribe(self, session_id: str) -> AsyncIterator[str]:
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async for line in self.native.subscribe(session_id):
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yield line
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async def get_history(self, session_id: str) -> list[dict[str, Any]]:
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return await self.native.get_history(session_id)
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def cleanup_session(self, session_id: str) -> None:
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self.native.cleanup_session(session_id)
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self.claude.cleanup_session(session_id)
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def set_storage(self, redis_storage: Any) -> None:
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self.native.set_storage(redis_storage)
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