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719 lines
25 KiB
Python
719 lines
25 KiB
Python
# Copyright 2026 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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from google.adk.features._feature_registry import FeatureName
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from google.adk.features._feature_registry import temporary_feature_override
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from google.adk.flows.llm_flows.functions import AF_FUNCTION_CALL_ID_PREFIX
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from google.adk.utils import streaming_utils
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from google.genai import types
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import pytest
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class TestStreamingResponseAggregator:
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@pytest.mark.asyncio
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async def test_process_response_with_text(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Hello")])
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)
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]
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)
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results = []
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async for r in aggregator.process_response(response):
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results.append(r)
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assert len(results) == 1
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assert results[0].content.parts[0].text == "Hello"
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assert results[0].partial
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@pytest.mark.asyncio
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async def test_process_response_with_thought(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(
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parts=[types.Part(text="Thinking...", thought=True)]
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)
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)
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]
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)
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results = []
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async for r in aggregator.process_response(response):
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results.append(r)
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assert len(results) == 1
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assert results[0].content.parts[0].text == "Thinking..."
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assert results[0].content.parts[0].thought
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assert results[0].partial
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@pytest.mark.asyncio
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async def test_process_response_multiple(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response1 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Hello ")])
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)
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]
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)
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response2 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="World!")])
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)
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]
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)
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async for _ in aggregator.process_response(response1):
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pass
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results = []
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async for r in aggregator.process_response(response2):
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results.append(r)
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assert len(results) == 1
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assert results[0].content.parts[0].text == "World!"
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closed_response = aggregator.close()
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assert closed_response is not None
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assert closed_response.content.parts[0].text == "Hello World!"
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@pytest.mark.asyncio
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async def test_process_response_interleaved_thought_and_text(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response1 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(
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parts=[types.Part(text="I am thinking...", thought=True)]
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)
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)
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]
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)
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response2 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(
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parts=[types.Part(text="Okay, I have a result.")]
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)
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)
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]
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)
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response3 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(
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parts=[types.Part(text=" The result is 42.")]
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)
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)
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]
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)
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async for _ in aggregator.process_response(response1):
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pass
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async for _ in aggregator.process_response(response2):
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pass
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async for _ in aggregator.process_response(response3):
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pass
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closed_response = aggregator.close()
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assert closed_response is not None
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assert len(closed_response.content.parts) == 2
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assert closed_response.content.parts[0].text == "I am thinking..."
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assert closed_response.content.parts[0].thought
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assert (
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closed_response.content.parts[1].text
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== "Okay, I have a result. The result is 42."
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)
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assert not closed_response.content.parts[1].thought
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def test_close_with_no_responses(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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closed_response = aggregator.close()
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assert closed_response is None
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@pytest.mark.asyncio
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async def test_close_with_finish_reason(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Hello")]),
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finish_reason=types.FinishReason.STOP,
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)
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]
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)
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async for _ in aggregator.process_response(response):
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pass
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closed_response = aggregator.close()
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assert closed_response is not None
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assert closed_response.content.parts[0].text == "Hello"
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assert closed_response.error_code is None
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assert closed_response.error_message is None
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@pytest.mark.asyncio
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async def test_close_with_error(self):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Error")]),
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finish_reason=types.FinishReason.RECITATION,
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finish_message="Recitation error",
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)
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]
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)
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async for _ in aggregator.process_response(response):
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pass
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closed_response = aggregator.close()
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assert closed_response is not None
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assert closed_response.content.parts[0].text == "Error"
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assert closed_response.error_code == types.FinishReason.RECITATION
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assert closed_response.error_message == "Recitation error"
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@pytest.mark.asyncio
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@pytest.mark.parametrize("use_progressive_sse", [True, False])
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async def test_empty_content_produces_empty_final_frame(
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self, use_progressive_sse
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):
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"""A candidate with empty parts + STOP passes through without an error.
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A terminal empty STOP chunk must not be classified as an error at the
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streaming layer; consumers that batch parts across chunks rely on it
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passing through cleanly.
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"""
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with temporary_feature_override(
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FeatureName.PROGRESSIVE_SSE_STREAMING, use_progressive_sse
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):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[]),
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finish_reason=types.FinishReason.STOP,
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)
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]
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)
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results = []
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async for r in aggregator.process_response(response):
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results.append(r)
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closed_response = aggregator.close()
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assert len(results) == 1
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assert results[0].content is not None
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assert results[0].error_code is None
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assert closed_response is not None
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assert closed_response.partial is False
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assert closed_response.content is None
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assert closed_response.finish_reason == types.FinishReason.STOP
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@pytest.mark.asyncio
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@pytest.mark.parametrize("use_progressive_sse", [True, False])
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async def test_prompt_feedback_block_returns_error_frame(
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self, use_progressive_sse
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):
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"""A prompt-level safety block produces a final frame with the error code."""
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with temporary_feature_override(
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FeatureName.PROGRESSIVE_SSE_STREAMING, use_progressive_sse
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):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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prompt_feedback=types.GenerateContentResponsePromptFeedback(
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block_reason=types.BlockedReason.SAFETY,
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block_reason_message="Blocked by safety",
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)
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)
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results = []
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async for r in aggregator.process_response(response):
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results.append(r)
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closed_response = aggregator.close()
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assert len(results) == 1
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assert closed_response is not None
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assert closed_response.partial is False
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assert closed_response.error_code == types.BlockedReason.SAFETY
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assert closed_response.error_message == "Blocked by safety"
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assert closed_response.content is None
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@pytest.mark.asyncio
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@pytest.mark.parametrize("use_progressive_sse", [True, False])
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async def test_pure_function_call_behavior_differs_by_mode(
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self, use_progressive_sse
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):
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"""A pure function call yields the part in progressive mode and an empty frame otherwise."""
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with temporary_feature_override(
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FeatureName.PROGRESSIVE_SSE_STREAMING, use_progressive_sse
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):
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aggregator = streaming_utils.StreamingResponseAggregator()
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response = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(
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parts=[
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types.Part(
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function_call=types.FunctionCall(
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name="my_tool",
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args={"x": 1},
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)
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)
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]
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),
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finish_reason=types.FinishReason.STOP,
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)
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]
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)
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results = []
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async for r in aggregator.process_response(response):
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results.append(r)
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closed_response = aggregator.close()
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assert closed_response is not None
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assert closed_response.partial is False
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if use_progressive_sse:
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assert closed_response.content is not None
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assert len(closed_response.content.parts) == 1
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assert closed_response.content.parts[0].function_call.name == "my_tool"
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else:
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assert closed_response.content is None
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@pytest.mark.asyncio
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@pytest.mark.parametrize(
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"test_id, use_progressive_sse, metadata_type",
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[
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("grounding_default", False, "grounding"),
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("grounding_progressive", True, "grounding"),
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("citation_default", False, "citation"),
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("citation_progressive", True, "citation"),
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],
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)
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async def test_close_preserves_metadata(
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self, test_id, use_progressive_sse, metadata_type
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):
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"""close() should carry metadata into the aggregated response."""
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aggregator = streaming_utils.StreamingResponseAggregator()
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metadata = None
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response1 = None
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response2 = None
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if metadata_type == "grounding":
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metadata = types.GroundingMetadata(
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grounding_chunks=[
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types.GroundingChunk(
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retrieved_context=types.GroundingChunkRetrievedContext(
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uri="https://example.com/doc1",
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title="Source",
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)
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)
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],
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)
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response1 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Hello ")]),
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grounding_metadata=metadata,
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)
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]
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)
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response2 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="World!")]),
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finish_reason=types.FinishReason.STOP,
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grounding_metadata=metadata,
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)
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]
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)
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elif metadata_type == "citation":
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metadata = types.CitationMetadata(
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citations=[
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types.Citation(
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start_index=0,
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end_index=10,
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uri="https://example.com/source",
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title="Source",
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)
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]
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)
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response1 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Cited text")]),
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)
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]
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)
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response2 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[]),
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finish_reason=types.FinishReason.STOP,
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citation_metadata=metadata,
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)
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]
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)
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async def run_test():
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async for _ in aggregator.process_response(response1):
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pass
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async for _ in aggregator.process_response(response2):
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pass
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closed_response = aggregator.close()
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assert closed_response is not None
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if use_progressive_sse:
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assert closed_response.partial is False
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if metadata_type == "grounding":
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assert closed_response.grounding_metadata is not None
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assert len(closed_response.grounding_metadata.grounding_chunks) == 1
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elif metadata_type == "citation":
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assert closed_response.citation_metadata is not None
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assert len(closed_response.citation_metadata.citations) == 1
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if use_progressive_sse:
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with temporary_feature_override(
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FeatureName.PROGRESSIVE_SSE_STREAMING, True
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):
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await run_test()
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else:
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await run_test()
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@pytest.mark.asyncio
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@pytest.mark.parametrize("use_progressive_sse", [False, True])
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async def test_close_propagates_model_version(self, use_progressive_sse):
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"""close() should carry model_version into the aggregated response."""
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aggregator = streaming_utils.StreamingResponseAggregator()
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response1 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="Hello ")]),
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)
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],
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model_version="gemini-test-1.0",
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)
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response2 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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content=types.Content(parts=[types.Part(text="World!")]),
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finish_reason=types.FinishReason.STOP,
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)
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],
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model_version="gemini-test-1.0",
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)
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async def run_test():
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async for _ in aggregator.process_response(response1):
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pass
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async for _ in aggregator.process_response(response2):
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pass
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closed_response = aggregator.close()
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assert closed_response is not None
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assert closed_response.model_version == "gemini-test-1.0"
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if use_progressive_sse:
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with temporary_feature_override(
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FeatureName.PROGRESSIVE_SSE_STREAMING, True
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):
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await run_test()
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else:
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await run_test()
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|
@pytest.mark.asyncio
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async def test_non_progressive_merged_yield_propagates_model_version(self):
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"""The mid-stream merged text event should carry model_version forward.
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|
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|
In non-progressive mode, when a new non-text response arrives after buffered
|
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text, the aggregator yields a synthesized merged-text LlmResponse before
|
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yielding the current partial. That merged event must preserve fields from
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the source response (model_version, grounding_metadata, citation_metadata,
|
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finish_reason).
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"""
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# PROGRESSIVE_SSE_STREAMING defaults to on; explicitly disable it to
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# exercise the non-progressive merged-yield code path under test.
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with temporary_feature_override(
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FeatureName.PROGRESSIVE_SSE_STREAMING, False
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|
):
|
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aggregator = streaming_utils.StreamingResponseAggregator()
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# First: buffer some text.
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response1 = types.GenerateContentResponse(
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candidates=[
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types.Candidate(
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|
content=types.Content(
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|
parts=[types.Part(text="Hello World!")]
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|
),
|
|
)
|
|
],
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|
model_version="gemini-test-2.0",
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)
|
|
# Second: a response without text triggers the merged yield path.
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|
response2 = types.GenerateContentResponse(
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|
candidates=[
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types.Candidate(
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|
content=types.Content(parts=[]),
|
|
finish_reason=types.FinishReason.STOP,
|
|
)
|
|
],
|
|
model_version="gemini-test-2.0",
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)
|
|
|
|
results = []
|
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async for r in aggregator.process_response(response1):
|
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results.append(r)
|
|
async for r in aggregator.process_response(response2):
|
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results.append(r)
|
|
|
|
# The synthesized merged-text event should carry model_version.
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|
merged_events = [
|
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r
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for r in results
|
|
if r.content
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|
and r.content.parts
|
|
and r.content.parts[0].text == "Hello World!"
|
|
and not r.partial
|
|
]
|
|
assert merged_events, "expected a merged non-partial text event"
|
|
assert merged_events[0].model_version == "gemini-test-2.0"
|
|
|
|
|
|
class TestFunctionCallIdGeneration:
|
|
"""Tests for function call ID generation in streaming mode."""
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_non_streaming_fc_generates_id_when_empty(self):
|
|
"""Non-streaming function call should get an adk-* ID if LLM didn't provide one."""
|
|
with temporary_feature_override(
|
|
FeatureName.PROGRESSIVE_SSE_STREAMING, True
|
|
):
|
|
aggregator = streaming_utils.StreamingResponseAggregator()
|
|
|
|
response = types.GenerateContentResponse(
|
|
candidates=[
|
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types.Candidate(
|
|
content=types.Content(
|
|
parts=[
|
|
types.Part(
|
|
function_call=types.FunctionCall(
|
|
name="my_tool",
|
|
args={"x": 1},
|
|
id=None, # No ID from LLM
|
|
)
|
|
)
|
|
]
|
|
),
|
|
finish_reason=types.FinishReason.STOP,
|
|
)
|
|
]
|
|
)
|
|
|
|
async for _ in aggregator.process_response(response):
|
|
pass
|
|
|
|
closed_response = aggregator.close()
|
|
assert closed_response is not None
|
|
fc = closed_response.content.parts[0].function_call
|
|
assert fc.id is not None
|
|
assert fc.id.startswith(AF_FUNCTION_CALL_ID_PREFIX)
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_non_streaming_fc_preserves_llm_assigned_id(self):
|
|
"""Non-streaming function call should preserve ID if LLM provided one."""
|
|
with temporary_feature_override(
|
|
FeatureName.PROGRESSIVE_SSE_STREAMING, True
|
|
):
|
|
aggregator = streaming_utils.StreamingResponseAggregator()
|
|
|
|
response = types.GenerateContentResponse(
|
|
candidates=[
|
|
types.Candidate(
|
|
content=types.Content(
|
|
parts=[
|
|
types.Part(
|
|
function_call=types.FunctionCall(
|
|
name="my_tool",
|
|
args={"x": 1},
|
|
id="llm-assigned-id",
|
|
)
|
|
)
|
|
]
|
|
),
|
|
finish_reason=types.FinishReason.STOP,
|
|
)
|
|
]
|
|
)
|
|
|
|
async for _ in aggregator.process_response(response):
|
|
pass
|
|
|
|
closed_response = aggregator.close()
|
|
assert closed_response is not None
|
|
fc = closed_response.content.parts[0].function_call
|
|
assert fc.id == "llm-assigned-id"
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_streaming_fc_generates_consistent_id_across_chunks(self):
|
|
"""Streaming function call should have the same ID in partial and final responses."""
|
|
with temporary_feature_override(
|
|
FeatureName.PROGRESSIVE_SSE_STREAMING, True
|
|
):
|
|
aggregator = streaming_utils.StreamingResponseAggregator()
|
|
|
|
# First chunk: function call starts
|
|
response1 = types.GenerateContentResponse(
|
|
candidates=[
|
|
types.Candidate(
|
|
content=types.Content(
|
|
parts=[
|
|
types.Part(
|
|
function_call=types.FunctionCall(
|
|
name="my_tool",
|
|
id=None,
|
|
partial_args=[
|
|
types.PartialArg(
|
|
json_path="$.x",
|
|
string_value="hello",
|
|
)
|
|
],
|
|
will_continue=True,
|
|
)
|
|
)
|
|
]
|
|
)
|
|
)
|
|
]
|
|
)
|
|
|
|
# Second chunk: function call continues
|
|
response2 = types.GenerateContentResponse(
|
|
candidates=[
|
|
types.Candidate(
|
|
content=types.Content(
|
|
parts=[
|
|
types.Part(
|
|
function_call=types.FunctionCall(
|
|
name=None,
|
|
id=None,
|
|
partial_args=[
|
|
types.PartialArg(
|
|
json_path="$.x",
|
|
string_value=" world",
|
|
)
|
|
],
|
|
will_continue=False, # Complete
|
|
)
|
|
)
|
|
]
|
|
),
|
|
finish_reason=types.FinishReason.STOP,
|
|
)
|
|
]
|
|
)
|
|
|
|
partial_results = []
|
|
async for r in aggregator.process_response(response1):
|
|
partial_results.append(r)
|
|
async for r in aggregator.process_response(response2):
|
|
partial_results.append(r)
|
|
|
|
closed_response = aggregator.close()
|
|
assert closed_response is not None
|
|
final_fc = closed_response.content.parts[0].function_call
|
|
assert final_fc.id is not None
|
|
assert final_fc.id.startswith(AF_FUNCTION_CALL_ID_PREFIX)
|
|
assert final_fc.args == {"x": "hello world"}
|
|
|
|
# Verify partial and final events share the same ID
|
|
partial_fc = partial_results[0].content.parts[0].function_call
|
|
assert (
|
|
partial_fc.id == final_fc.id
|
|
), f"Partial FC ID ({partial_fc.id!r}) != Final FC ID ({final_fc.id!r})"
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_multiple_streaming_fcs_get_different_ids(self):
|
|
"""Multiple function calls arriving in separate chunks should get different IDs."""
|
|
with temporary_feature_override(
|
|
FeatureName.PROGRESSIVE_SSE_STREAMING, True
|
|
):
|
|
aggregator = streaming_utils.StreamingResponseAggregator()
|
|
|
|
# First FC
|
|
response1 = types.GenerateContentResponse(
|
|
candidates=[
|
|
types.Candidate(
|
|
content=types.Content(
|
|
parts=[
|
|
types.Part(
|
|
function_call=types.FunctionCall(
|
|
name="tool_a",
|
|
id=None,
|
|
partial_args=[
|
|
types.PartialArg(
|
|
json_path="$.a", string_value="val_a"
|
|
)
|
|
],
|
|
will_continue=False,
|
|
)
|
|
)
|
|
]
|
|
)
|
|
)
|
|
]
|
|
)
|
|
|
|
# Second FC
|
|
response2 = types.GenerateContentResponse(
|
|
candidates=[
|
|
types.Candidate(
|
|
content=types.Content(
|
|
parts=[
|
|
types.Part(
|
|
function_call=types.FunctionCall(
|
|
name="tool_b",
|
|
id=None,
|
|
partial_args=[
|
|
types.PartialArg(
|
|
json_path="$.b", string_value="val_b"
|
|
)
|
|
],
|
|
will_continue=False,
|
|
)
|
|
)
|
|
]
|
|
),
|
|
finish_reason=types.FinishReason.STOP,
|
|
)
|
|
]
|
|
)
|
|
|
|
async for _ in aggregator.process_response(response1):
|
|
pass
|
|
async for _ in aggregator.process_response(response2):
|
|
pass
|
|
|
|
closed_response = aggregator.close()
|
|
assert closed_response is not None
|
|
assert len(closed_response.content.parts) == 2
|
|
|
|
fc_a = closed_response.content.parts[0].function_call
|
|
fc_b = closed_response.content.parts[1].function_call
|
|
|
|
assert fc_a.id is not None
|
|
assert fc_b.id is not None
|
|
assert fc_a.id.startswith(AF_FUNCTION_CALL_ID_PREFIX)
|
|
assert fc_b.id.startswith(AF_FUNCTION_CALL_ID_PREFIX)
|
|
assert fc_a.id != fc_b.id # Different IDs for different FCs
|