feat: continue stream processing on client cancel (#3796)
This commit is contained in:
cthomas
@@ -126,271 +126,6 @@ class AnthropicStreamingInterface:
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logger.error("Error checking inner thoughts: %s", e)
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raise
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async def process(
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self,
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stream: AsyncStream[BetaRawMessageStreamEvent],
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ttft_span: Optional["Span"] = None,
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) -> AsyncGenerator[LettaMessage | LettaStopReason, None]:
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prev_message_type = None
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message_index = 0
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try:
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async with stream:
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async for event in stream:
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# TODO: Support BetaThinkingBlock, BetaRedactedThinkingBlock
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if isinstance(event, BetaRawContentBlockStartEvent):
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content = event.content_block
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if isinstance(content, BetaTextBlock):
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self.anthropic_mode = EventMode.TEXT
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# TODO: Can capture citations, etc.
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elif isinstance(content, BetaToolUseBlock):
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self.anthropic_mode = EventMode.TOOL_USE
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self.tool_call_id = content.id
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self.tool_call_name = content.name
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self.inner_thoughts_complete = False
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if not self.use_assistant_message:
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# Buffer the initial tool call message instead of yielding immediately
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tool_call_msg = ToolCallMessage(
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id=self.letta_message_id,
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tool_call=ToolCallDelta(name=self.tool_call_name, tool_call_id=self.tool_call_id),
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date=datetime.now(timezone.utc).isoformat(),
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)
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self.tool_call_buffer.append(tool_call_msg)
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elif isinstance(content, BetaThinkingBlock):
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self.anthropic_mode = EventMode.THINKING
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# TODO: Can capture signature, etc.
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elif isinstance(content, BetaRedactedThinkingBlock):
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self.anthropic_mode = EventMode.REDACTED_THINKING
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if prev_message_type and prev_message_type != "hidden_reasoning_message":
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message_index += 1
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hidden_reasoning_message = HiddenReasoningMessage(
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id=self.letta_message_id,
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state="redacted",
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hidden_reasoning=content.data,
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date=datetime.now(timezone.utc).isoformat(),
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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self.reasoning_messages.append(hidden_reasoning_message)
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prev_message_type = hidden_reasoning_message.message_type
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yield hidden_reasoning_message
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elif isinstance(event, BetaRawContentBlockDeltaEvent):
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delta = event.delta
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if isinstance(delta, BetaTextDelta):
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# Safety check
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if not self.anthropic_mode == EventMode.TEXT:
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raise RuntimeError(
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f"Streaming integrity failed - received BetaTextDelta object while not in TEXT EventMode: {delta}"
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)
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# Combine buffer with current text to handle tags split across chunks
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combined_text = self.partial_tag_buffer + delta.text
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# Remove all occurrences of </thinking> tag
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cleaned_text = combined_text.replace("</thinking>", "")
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# Extract just the new content (without the buffer part)
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if len(self.partial_tag_buffer) <= len(cleaned_text):
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delta.text = cleaned_text[len(self.partial_tag_buffer) :]
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else:
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# Edge case: the tag was removed and now the text is shorter than the buffer
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delta.text = ""
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# Store the last 10 characters (or all if less than 10) for the next chunk
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# This is enough to catch "</thinking" which is 10 characters
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self.partial_tag_buffer = combined_text[-10:] if len(combined_text) > 10 else combined_text
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self.accumulated_inner_thoughts.append(delta.text)
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if prev_message_type and prev_message_type != "reasoning_message":
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message_index += 1
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reasoning_message = ReasoningMessage(
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id=self.letta_message_id,
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reasoning=self.accumulated_inner_thoughts[-1],
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date=datetime.now(timezone.utc).isoformat(),
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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self.reasoning_messages.append(reasoning_message)
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prev_message_type = reasoning_message.message_type
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yield reasoning_message
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elif isinstance(delta, BetaInputJSONDelta):
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if not self.anthropic_mode == EventMode.TOOL_USE:
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raise RuntimeError(
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f"Streaming integrity failed - received BetaInputJSONDelta object while not in TOOL_USE EventMode: {delta}"
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)
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self.accumulated_tool_call_args += delta.partial_json
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current_parsed = self.json_parser.parse(self.accumulated_tool_call_args)
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# Start detecting a difference in inner thoughts
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previous_inner_thoughts = self.previous_parse.get(INNER_THOUGHTS_KWARG, "")
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current_inner_thoughts = current_parsed.get(INNER_THOUGHTS_KWARG, "")
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inner_thoughts_diff = current_inner_thoughts[len(previous_inner_thoughts) :]
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if inner_thoughts_diff:
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if prev_message_type and prev_message_type != "reasoning_message":
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message_index += 1
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reasoning_message = ReasoningMessage(
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id=self.letta_message_id,
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reasoning=inner_thoughts_diff,
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date=datetime.now(timezone.utc).isoformat(),
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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self.reasoning_messages.append(reasoning_message)
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prev_message_type = reasoning_message.message_type
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yield reasoning_message
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# Check if inner thoughts are complete - if so, flush the buffer
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if not self.inner_thoughts_complete and self._check_inner_thoughts_complete(self.accumulated_tool_call_args):
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self.inner_thoughts_complete = True
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# Flush all buffered tool call messages
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if len(self.tool_call_buffer) > 0:
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if prev_message_type and prev_message_type != "tool_call_message":
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message_index += 1
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# Strip out the inner thoughts from the buffered tool call arguments before streaming
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tool_call_args = ""
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for buffered_msg in self.tool_call_buffer:
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tool_call_args += buffered_msg.tool_call.arguments if buffered_msg.tool_call.arguments else ""
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tool_call_args = tool_call_args.replace(f'"{INNER_THOUGHTS_KWARG}": "{current_inner_thoughts}"', "")
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tool_call_msg = ToolCallMessage(
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id=self.tool_call_buffer[0].id,
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otid=Message.generate_otid_from_id(self.tool_call_buffer[0].id, message_index),
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date=self.tool_call_buffer[0].date,
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name=self.tool_call_buffer[0].name,
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sender_id=self.tool_call_buffer[0].sender_id,
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step_id=self.tool_call_buffer[0].step_id,
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tool_call=ToolCallDelta(
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name=self.tool_call_name,
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tool_call_id=self.tool_call_id,
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arguments=tool_call_args,
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),
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)
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prev_message_type = tool_call_msg.message_type
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yield tool_call_msg
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self.tool_call_buffer = []
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# Start detecting special case of "send_message"
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if self.tool_call_name == DEFAULT_MESSAGE_TOOL and self.use_assistant_message:
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previous_send_message = self.previous_parse.get(DEFAULT_MESSAGE_TOOL_KWARG, "")
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current_send_message = current_parsed.get(DEFAULT_MESSAGE_TOOL_KWARG, "")
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send_message_diff = current_send_message[len(previous_send_message) :]
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# Only stream out if it's not an empty string
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if send_message_diff:
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if prev_message_type and prev_message_type != "assistant_message":
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message_index += 1
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assistant_msg = AssistantMessage(
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id=self.letta_message_id,
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content=[TextContent(text=send_message_diff)],
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date=datetime.now(timezone.utc).isoformat(),
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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prev_message_type = assistant_msg.message_type
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yield assistant_msg
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else:
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# Otherwise, it is a normal tool call - buffer or yield based on inner thoughts status
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tool_call_msg = ToolCallMessage(
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id=self.letta_message_id,
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tool_call=ToolCallDelta(
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name=self.tool_call_name, tool_call_id=self.tool_call_id, arguments=delta.partial_json
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),
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date=datetime.now(timezone.utc).isoformat(),
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)
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if self.inner_thoughts_complete:
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if prev_message_type and prev_message_type != "tool_call_message":
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message_index += 1
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tool_call_msg.otid = Message.generate_otid_from_id(self.letta_message_id, message_index)
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prev_message_type = tool_call_msg.message_type
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yield tool_call_msg
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else:
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self.tool_call_buffer.append(tool_call_msg)
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# Set previous parse
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self.previous_parse = current_parsed
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elif isinstance(delta, BetaThinkingDelta):
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# Safety check
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if not self.anthropic_mode == EventMode.THINKING:
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raise RuntimeError(
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f"Streaming integrity failed - received BetaThinkingBlock object while not in THINKING EventMode: {delta}"
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)
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if prev_message_type and prev_message_type != "reasoning_message":
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message_index += 1
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reasoning_message = ReasoningMessage(
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id=self.letta_message_id,
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source="reasoner_model",
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reasoning=delta.thinking,
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date=datetime.now(timezone.utc).isoformat(),
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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self.reasoning_messages.append(reasoning_message)
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prev_message_type = reasoning_message.message_type
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yield reasoning_message
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elif isinstance(delta, BetaSignatureDelta):
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# Safety check
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if not self.anthropic_mode == EventMode.THINKING:
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raise RuntimeError(
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f"Streaming integrity failed - received BetaSignatureDelta object while not in THINKING EventMode: {delta}"
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)
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if prev_message_type and prev_message_type != "reasoning_message":
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message_index += 1
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reasoning_message = ReasoningMessage(
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id=self.letta_message_id,
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source="reasoner_model",
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reasoning="",
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date=datetime.now(timezone.utc).isoformat(),
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signature=delta.signature,
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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self.reasoning_messages.append(reasoning_message)
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prev_message_type = reasoning_message.message_type
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yield reasoning_message
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elif isinstance(event, BetaRawMessageStartEvent):
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self.message_id = event.message.id
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self.input_tokens += event.message.usage.input_tokens
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self.output_tokens += event.message.usage.output_tokens
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self.model = event.message.model
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elif isinstance(event, BetaRawMessageDeltaEvent):
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self.output_tokens += event.usage.output_tokens
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elif isinstance(event, BetaRawMessageStopEvent):
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# Don't do anything here! We don't want to stop the stream.
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pass
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elif isinstance(event, BetaRawContentBlockStopEvent):
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# If we're exiting a tool use block and there are still buffered messages,
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# we should flush them now
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if self.anthropic_mode == EventMode.TOOL_USE and self.tool_call_buffer:
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for buffered_msg in self.tool_call_buffer:
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yield buffered_msg
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self.tool_call_buffer = []
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self.anthropic_mode = None
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except asyncio.CancelledError as e:
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import traceback
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logger.error("Cancelled stream %s: %s", e, traceback.format_exc())
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ttft_span.add_event(
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name="stop_reason",
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attributes={"stop_reason": StopReasonType.cancelled.value, "error": str(e), "stacktrace": traceback.format_exc()},
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)
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raise e
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except Exception as e:
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import traceback
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logger.error("Error processing stream: %s", e, traceback.format_exc())
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ttft_span.add_event(
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name="stop_reason",
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attributes={"stop_reason": StopReasonType.error.value, "error": str(e), "stacktrace": traceback.format_exc()},
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)
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yield LettaStopReason(stop_reason=StopReasonType.error)
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raise e
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finally:
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logger.info("AnthropicStreamingInterface: Stream processing complete.")
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def get_reasoning_content(self) -> list[TextContent | ReasoningContent | RedactedReasoningContent]:
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def _process_group(
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group: list[ReasoningMessage | HiddenReasoningMessage], group_type: str
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@@ -445,3 +180,294 @@ class AnthropicStreamingInterface:
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content.text = content.text[:cutoff]
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return merged
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async def process(
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self,
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stream: AsyncStream[BetaRawMessageStreamEvent],
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ttft_span: Optional["Span"] = None,
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) -> AsyncGenerator[LettaMessage | LettaStopReason, None]:
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prev_message_type = None
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message_index = 0
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event = None
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try:
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async with stream:
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async for event in stream:
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try:
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async for message in self._process_event(event, ttft_span, prev_message_type, message_index):
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new_message_type = message.message_type
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if new_message_type != prev_message_type:
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if prev_message_type != None:
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message_index += 1
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prev_message_type = new_message_type
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yield message
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except asyncio.CancelledError as e:
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import traceback
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logger.info("Cancelled stream attempt but overriding %s: %s", e, traceback.format_exc())
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async for message in self._process_event(event, ttft_span, prev_message_type, message_index):
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new_message_type = message.message_type
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if new_message_type != prev_message_type:
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if prev_message_type != None:
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message_index += 1
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prev_message_type = new_message_type
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yield message
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# Don't raise the exception here
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continue
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except Exception as e:
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import traceback
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logger.error("Error processing stream: %s", e, traceback.format_exc())
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ttft_span.add_event(
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name="stop_reason",
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attributes={"stop_reason": StopReasonType.error.value, "error": str(e), "stacktrace": traceback.format_exc()},
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)
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yield LettaStopReason(stop_reason=StopReasonType.error)
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raise e
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finally:
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logger.info("AnthropicStreamingInterface: Stream processing complete.")
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async def _process_event(
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self,
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event: BetaRawMessageStreamEvent,
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ttft_span: Optional["Span"] = None,
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prev_message_type: Optional[str] = None,
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message_index: int = 0,
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) -> AsyncGenerator[LettaMessage | LettaStopReason, None]:
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"""Process a single event from the Anthropic stream and yield any resulting messages.
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Args:
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event: The event to process
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Yields:
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Messages generated from processing this event
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"""
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if isinstance(event, BetaRawContentBlockStartEvent):
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content = event.content_block
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if isinstance(content, BetaTextBlock):
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self.anthropic_mode = EventMode.TEXT
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# TODO: Can capture citations, etc.
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elif isinstance(content, BetaToolUseBlock):
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self.anthropic_mode = EventMode.TOOL_USE
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self.tool_call_id = content.id
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self.tool_call_name = content.name
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self.inner_thoughts_complete = False
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if not self.use_assistant_message:
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# Buffer the initial tool call message instead of yielding immediately
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tool_call_msg = ToolCallMessage(
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id=self.letta_message_id,
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tool_call=ToolCallDelta(name=self.tool_call_name, tool_call_id=self.tool_call_id),
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date=datetime.now(timezone.utc).isoformat(),
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)
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self.tool_call_buffer.append(tool_call_msg)
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elif isinstance(content, BetaThinkingBlock):
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self.anthropic_mode = EventMode.THINKING
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# TODO: Can capture signature, etc.
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elif isinstance(content, BetaRedactedThinkingBlock):
|
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self.anthropic_mode = EventMode.REDACTED_THINKING
|
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if prev_message_type and prev_message_type != "hidden_reasoning_message":
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message_index += 1
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hidden_reasoning_message = HiddenReasoningMessage(
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id=self.letta_message_id,
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state="redacted",
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hidden_reasoning=content.data,
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date=datetime.now(timezone.utc).isoformat(),
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otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
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)
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self.reasoning_messages.append(hidden_reasoning_message)
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prev_message_type = hidden_reasoning_message.message_type
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yield hidden_reasoning_message
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|
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elif isinstance(event, BetaRawContentBlockDeltaEvent):
|
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delta = event.delta
|
||||
|
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if isinstance(delta, BetaTextDelta):
|
||||
# Safety check
|
||||
if not self.anthropic_mode == EventMode.TEXT:
|
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raise RuntimeError(f"Streaming integrity failed - received BetaTextDelta object while not in TEXT EventMode: {delta}")
|
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|
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# Combine buffer with current text to handle tags split across chunks
|
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combined_text = self.partial_tag_buffer + delta.text
|
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|
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# Remove all occurrences of </thinking> tag
|
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cleaned_text = combined_text.replace("</thinking>", "")
|
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|
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# Extract just the new content (without the buffer part)
|
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if len(self.partial_tag_buffer) <= len(cleaned_text):
|
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delta.text = cleaned_text[len(self.partial_tag_buffer) :]
|
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else:
|
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# Edge case: the tag was removed and now the text is shorter than the buffer
|
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delta.text = ""
|
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|
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# Store the last 10 characters (or all if less than 10) for the next chunk
|
||||
# This is enough to catch "</thinking" which is 10 characters
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self.partial_tag_buffer = combined_text[-10:] if len(combined_text) > 10 else combined_text
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self.accumulated_inner_thoughts.append(delta.text)
|
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if prev_message_type and prev_message_type != "reasoning_message":
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message_index += 1
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reasoning_message = ReasoningMessage(
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id=self.letta_message_id,
|
||||
reasoning=self.accumulated_inner_thoughts[-1],
|
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date=datetime.now(timezone.utc).isoformat(),
|
||||
otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
|
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)
|
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self.reasoning_messages.append(reasoning_message)
|
||||
prev_message_type = reasoning_message.message_type
|
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yield reasoning_message
|
||||
|
||||
elif isinstance(delta, BetaInputJSONDelta):
|
||||
if not self.anthropic_mode == EventMode.TOOL_USE:
|
||||
raise RuntimeError(
|
||||
f"Streaming integrity failed - received BetaInputJSONDelta object while not in TOOL_USE EventMode: {delta}"
|
||||
)
|
||||
|
||||
self.accumulated_tool_call_args += delta.partial_json
|
||||
current_parsed = self.json_parser.parse(self.accumulated_tool_call_args)
|
||||
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||||
# Start detecting a difference in inner thoughts
|
||||
previous_inner_thoughts = self.previous_parse.get(INNER_THOUGHTS_KWARG, "")
|
||||
current_inner_thoughts = current_parsed.get(INNER_THOUGHTS_KWARG, "")
|
||||
inner_thoughts_diff = current_inner_thoughts[len(previous_inner_thoughts) :]
|
||||
|
||||
if inner_thoughts_diff:
|
||||
if prev_message_type and prev_message_type != "reasoning_message":
|
||||
message_index += 1
|
||||
reasoning_message = ReasoningMessage(
|
||||
id=self.letta_message_id,
|
||||
reasoning=inner_thoughts_diff,
|
||||
date=datetime.now(timezone.utc).isoformat(),
|
||||
otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
|
||||
)
|
||||
self.reasoning_messages.append(reasoning_message)
|
||||
prev_message_type = reasoning_message.message_type
|
||||
yield reasoning_message
|
||||
|
||||
# Check if inner thoughts are complete - if so, flush the buffer
|
||||
if not self.inner_thoughts_complete and self._check_inner_thoughts_complete(self.accumulated_tool_call_args):
|
||||
self.inner_thoughts_complete = True
|
||||
# Flush all buffered tool call messages
|
||||
if len(self.tool_call_buffer) > 0:
|
||||
if prev_message_type and prev_message_type != "tool_call_message":
|
||||
message_index += 1
|
||||
|
||||
# Strip out the inner thoughts from the buffered tool call arguments before streaming
|
||||
tool_call_args = ""
|
||||
for buffered_msg in self.tool_call_buffer:
|
||||
tool_call_args += buffered_msg.tool_call.arguments if buffered_msg.tool_call.arguments else ""
|
||||
tool_call_args = tool_call_args.replace(f'"{INNER_THOUGHTS_KWARG}": "{current_inner_thoughts}"', "")
|
||||
|
||||
tool_call_msg = ToolCallMessage(
|
||||
id=self.tool_call_buffer[0].id,
|
||||
otid=Message.generate_otid_from_id(self.tool_call_buffer[0].id, message_index),
|
||||
date=self.tool_call_buffer[0].date,
|
||||
name=self.tool_call_buffer[0].name,
|
||||
sender_id=self.tool_call_buffer[0].sender_id,
|
||||
step_id=self.tool_call_buffer[0].step_id,
|
||||
tool_call=ToolCallDelta(
|
||||
name=self.tool_call_name,
|
||||
tool_call_id=self.tool_call_id,
|
||||
arguments=tool_call_args,
|
||||
),
|
||||
)
|
||||
prev_message_type = tool_call_msg.message_type
|
||||
yield tool_call_msg
|
||||
self.tool_call_buffer = []
|
||||
|
||||
# Start detecting special case of "send_message"
|
||||
if self.tool_call_name == DEFAULT_MESSAGE_TOOL and self.use_assistant_message:
|
||||
previous_send_message = self.previous_parse.get(DEFAULT_MESSAGE_TOOL_KWARG, "")
|
||||
current_send_message = current_parsed.get(DEFAULT_MESSAGE_TOOL_KWARG, "")
|
||||
send_message_diff = current_send_message[len(previous_send_message) :]
|
||||
|
||||
# Only stream out if it's not an empty string
|
||||
if send_message_diff:
|
||||
if prev_message_type and prev_message_type != "assistant_message":
|
||||
message_index += 1
|
||||
assistant_msg = AssistantMessage(
|
||||
id=self.letta_message_id,
|
||||
content=[TextContent(text=send_message_diff)],
|
||||
date=datetime.now(timezone.utc).isoformat(),
|
||||
otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
|
||||
)
|
||||
prev_message_type = assistant_msg.message_type
|
||||
yield assistant_msg
|
||||
else:
|
||||
# Otherwise, it is a normal tool call - buffer or yield based on inner thoughts status
|
||||
tool_call_msg = ToolCallMessage(
|
||||
id=self.letta_message_id,
|
||||
tool_call=ToolCallDelta(name=self.tool_call_name, tool_call_id=self.tool_call_id, arguments=delta.partial_json),
|
||||
date=datetime.now(timezone.utc).isoformat(),
|
||||
)
|
||||
if self.inner_thoughts_complete:
|
||||
if prev_message_type and prev_message_type != "tool_call_message":
|
||||
message_index += 1
|
||||
tool_call_msg.otid = Message.generate_otid_from_id(self.letta_message_id, message_index)
|
||||
prev_message_type = tool_call_msg.message_type
|
||||
yield tool_call_msg
|
||||
else:
|
||||
self.tool_call_buffer.append(tool_call_msg)
|
||||
|
||||
# Set previous parse
|
||||
self.previous_parse = current_parsed
|
||||
elif isinstance(delta, BetaThinkingDelta):
|
||||
# Safety check
|
||||
if not self.anthropic_mode == EventMode.THINKING:
|
||||
raise RuntimeError(
|
||||
f"Streaming integrity failed - received BetaThinkingBlock object while not in THINKING EventMode: {delta}"
|
||||
)
|
||||
|
||||
if prev_message_type and prev_message_type != "reasoning_message":
|
||||
message_index += 1
|
||||
reasoning_message = ReasoningMessage(
|
||||
id=self.letta_message_id,
|
||||
source="reasoner_model",
|
||||
reasoning=delta.thinking,
|
||||
date=datetime.now(timezone.utc).isoformat(),
|
||||
otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
|
||||
)
|
||||
self.reasoning_messages.append(reasoning_message)
|
||||
prev_message_type = reasoning_message.message_type
|
||||
yield reasoning_message
|
||||
elif isinstance(delta, BetaSignatureDelta):
|
||||
# Safety check
|
||||
if not self.anthropic_mode == EventMode.THINKING:
|
||||
raise RuntimeError(
|
||||
f"Streaming integrity failed - received BetaSignatureDelta object while not in THINKING EventMode: {delta}"
|
||||
)
|
||||
|
||||
if prev_message_type and prev_message_type != "reasoning_message":
|
||||
message_index += 1
|
||||
reasoning_message = ReasoningMessage(
|
||||
id=self.letta_message_id,
|
||||
source="reasoner_model",
|
||||
reasoning="",
|
||||
date=datetime.now(timezone.utc).isoformat(),
|
||||
signature=delta.signature,
|
||||
otid=Message.generate_otid_from_id(self.letta_message_id, message_index),
|
||||
)
|
||||
self.reasoning_messages.append(reasoning_message)
|
||||
prev_message_type = reasoning_message.message_type
|
||||
yield reasoning_message
|
||||
elif isinstance(event, BetaRawMessageStartEvent):
|
||||
self.message_id = event.message.id
|
||||
self.input_tokens += event.message.usage.input_tokens
|
||||
self.output_tokens += event.message.usage.output_tokens
|
||||
self.model = event.message.model
|
||||
elif isinstance(event, BetaRawMessageDeltaEvent):
|
||||
self.output_tokens += event.usage.output_tokens
|
||||
elif isinstance(event, BetaRawMessageStopEvent):
|
||||
# Don't do anything here! We don't want to stop the stream.
|
||||
pass
|
||||
elif isinstance(event, BetaRawContentBlockStopEvent):
|
||||
# If we're exiting a tool use block and there are still buffered messages,
|
||||
# we should flush them now
|
||||
if self.anthropic_mode == EventMode.TOOL_USE and self.tool_call_buffer:
|
||||
for buffered_msg in self.tool_call_buffer:
|
||||
yield buffered_msg
|
||||
self.tool_call_buffer = []
|
||||
|
||||
self.anthropic_mode = None
|
||||
|
||||
Reference in New Issue
Block a user