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LangChain 源码剖析-流媒体系统方法详解(Streaming)

LangChain 源码剖析-流媒体系统方法详解(Streaming)

LangChain 源码剖析-流媒体系统方法详解(Streaming)

  • 流媒体对于增强基于LLM构建的应用程序的响应能力至关重要。通过逐步显示输出,甚至在完整响应准备就绪之前,流式传输显著改善了用户体验(UX),特别是在处理LLM的延迟时。

概述

  • LangChain的流媒体系统允许您将代理运行的实时反馈呈现给您的应用程序。
  • LangChain流媒体有以下几种方式:

流代理进度(Stream agent progress)

  • 在每个代理步骤后获取状态更新。
  • 要流式传输代理进度,请使用stream_mode=“updates”的流或astream方法。这将在每个代理步骤后发出一个事件。
  • LLM node:带有工具调用请求的AIMessage
  • Tool node:带执行结果的ToolMessage
  • LLM node:最终AI响应
from langchain.agents import create_agentdef get_weather(city: str) -> str:    """Get weather for a given city."""    return f"It's always sunny in {city}!"agent = create_agent(    model="gpt-5-nano",    tools=[get_weather],)for chunk in agent.stream(      {"messages": [{"role""user""content""What is the weather in SF?"}]},    stream_mode="updates",):    for step, data in chunk.items():        print(f"step: {step}")        print(f"content: {data['messages'][-1].content_blocks}")
  • 响应信息
step: modelcontent: [{'type''tool_call''name''get_weather''args': {'city''San Francisco'}, 'id''call_OW2NYNsNSKhRZpjW0wm2Aszd'}]step: toolscontent: [{'type''text''text'"It's always sunny in San Francisco!"}]step: modelcontent: [{'type''text''text''It's always sunny in San Francisco!'}]

流式LLM令牌(Stream LLM tokens)

  • 在生成时流式传输语言模型令牌。
  • 要在LLM生成令牌时对其进行流式传输,请使用stream_mode=“messages”。下面您可以看到代理流工具调用的输出和最终响应。
from langchain.agents import create_agentdef get_weather(city: str) -> str:    """Get weather for a given city."""    return f"It's always sunny in {city}!"agent = create_agent(    model="gpt-5-nano",    tools=[get_weather],)for token, metadata in agent.stream(      {"messages": [{"role""user""content""What is the weather in SF?"}]},    stream_mode="messages",):    print(f"node: {metadata['langgraph_node']}")    print(f"content: {token.content_blocks}")    print("\n")
  • 响应信息
node: modelcontent: [{'type''tool_call_chunk''id''call_vbCyBcP8VuneUzyYlSBZZsVa''name''get_weather''args''''index': 0}]node: modelcontent: [{'type''tool_call_chunk''id': None, 'name': None, 'args''{"''index': 0}]node: modelcontent: [{'type''tool_call_chunk''id': None, 'name': None, 'args''city''index': 0}]node: modelcontent: [{'type''tool_call_chunk''id': None, 'name': None, 'args''":"''index': 0}]node: modelcontent: [{'type''tool_call_chunk''id': None, 'name': None, 'args''San''index': 0}]node: modelcontent: [{'type''tool_call_chunk''id': None, 'name': None, 'args'' Francisco''index': 0}]node: modelcontent: [{'type''tool_call_chunk''id': None, 'name': None, 'args''"}''index': 0}]node: modelcontent: []node: toolscontent: [{'type''text''text'"It's always sunny in San Francisco!"}]node: modelcontent: []node: modelcontent: [{'type''text''text''Here'}]node: modelcontent: [{'type''text''text'''s'}]node: modelcontent: [{'type': 'text', 'text': ' what'}]node: modelcontent: [{'type': 'text', 'text': ' I'}]node: modelcontent: [{'type': 'text', 'text': ' got'}]node: modelcontent: [{'type': 'text', 'text': ':'}]node: modelcontent: [{'type': 'text', 'text': ' "'}]node: modelcontent: [{'type': 'text', 'text': "It's"}]node: modelcontent: [{'type': 'text', 'text': ' always'}]node: modelcontent: [{'type': 'text', 'text': ' sunny'}]node: modelcontent: [{'type': 'text', 'text': ' in'}]node: modelcontent: [{'type': 'text', 'text': ' San'}]node: modelcontent: [{'type': 'text', 'text': ' Francisco'}]node: modelcontent: [{'type': 'text', 'text': '!"\n\n'}]

流式自定义更新(Stream custom updates)

  • 发出用户定义的信号(例如,“已提取10/100条记录”)。
  • 要在工具执行时流式传输更新,可以使用get_stream_writer。
from langchain.agents import create_agentfrom langgraph.config import get_stream_writer  def get_weather(city: str) -> str:    """Get weather for a given city."""    writer = get_stream_writer()      # stream any arbitrary data    writer(f"Looking up data for city: {city}")    writer(f"Acquired data for city: {city}")    return f"It's always sunny in {city}!"agent = create_agent(    model="claude-sonnet-4-5-20250929",    tools=[get_weather],)for chunk in agent.stream(    {"messages": [{"role""user""content""What is the weather in SF?"}]},    stream_mode="custom"):    print(chunk)
  • 响应信息
Looking up data for city: San FranciscoAcquired data for city: San Francisco

流式传输多种模式(Stream multiple modes)——从更新(代理进度)、消息(LLM令牌+元数据)或自定义(任意用户数据)中进行选择。

  • 您可以通过以列表形式传递流模式来指定多种流模式:stream_mode=[“updates”, “custom”]:
from langchain.agents import create_agentfrom langgraph.config import get_stream_writerdef get_weather(city: str) -> str:    """Get weather for a given city."""    writer = get_stream_writer()    writer(f"Looking up data for city: {city}")    writer(f"Acquired data for city: {city}")    return f"It's always sunny in {city}!"agent = create_agent(    model="gpt-5-nano",    tools=[get_weather],)for stream_mode, chunk in agent.stream(      {"messages": [{"role""user""content""What is the weather in SF?"}]},    stream_mode=["updates""custom"]):    print(f"stream_mode: {stream_mode}")    print(f"content: {chunk}")    print("\n")
  • 响应信息
stream_mode: updatescontent: {'model': {'messages': [AIMessage(content='', response_metadata={'token_usage': {'completion_tokens'280'prompt_tokens'132'total_tokens'412'completion_tokens_details': {'accepted_prediction_tokens'0'audio_tokens'0'reasoning_tokens'256'rejected_prediction_tokens'0}, 'prompt_tokens_details': {'audio_tokens'0'cached_tokens'0}}, 'model_provider''openai''model_name''gpt-5-nano-2025-08-07''system_fingerprint'None'id''chatcmpl-C9tlgBzGEbedGYxZ0rTCz5F7OXpL7''service_tier''default''finish_reason''tool_calls''logprobs'None}, id='lc_run--480c07cb-e405-4411-aa7f-0520fddeed66-0', tool_calls=[{'name''get_weather''args': {'city''San Francisco'}, 'id''call_KTNQIftMrl9vgNwEfAJMVu7r''type''tool_call'}], usage_metadata={'input_tokens'132'output_tokens'280'total_tokens'412'input_token_details': {'audio'0'cache_read'0}, 'output_token_details': {'audio'0'reasoning'256}})]}}stream_mode: customcontent: Looking up data for city: San Franciscostream_mode: customcontent: Acquired data for city: San Franciscostream_mode: updatescontent: {'tools': {'messages': [ToolMessage(content="It's always sunny in San Francisco!", name='get_weather', tool_call_id='call_KTNQIftMrl9vgNwEfAJMVu7r')]}}stream_mode: updatescontent: {'model': {'messages': [AIMessage(content='San Francisco weather: It's always sunny in San Francisco!\n\n', response_metadata={'token_usage': {'completion_tokens': 764, 'prompt_tokens': 168, 'total_tokens': 932, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 704, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_provider': 'openai', 'model_name': 'gpt-5-nano-2025-08-07', 'system_fingerprint': None, 'id': 'chatcmpl-C9tljDFVki1e1haCyikBptAuXuHYG', 'service_tier': 'default', 'finish_reason': 'stop', 'logprobs': None}, id='lc_run--acbc740a-18fe-4a14-8619-da92a0d0ee90-0', usage_metadata={'input_tokens': 168, 'output_tokens': 764, 'total_tokens': 932, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 704}})]}}

禁用流媒体(Disable streaming)

  • 在某些应用程序中,您可能需要禁用给定模型的单个令牌流。
  • 这在多代理系统中非常有用,可以控制哪些代理流式传输其输出。
  • 请参阅《模型》指南,了解如何禁用流媒体。
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  1. 请求信息 : 2026-06-05 02:05:42 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/711318.html
  2. 运行时间 : 0.233709s [ 吞吐率:4.28req/s ] 内存消耗:4,837.56kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=0bbd133525bec34b1f30f877dbbf7ec7
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  1. CONNECT:[ UseTime:0.001065s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001593s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000756s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000740s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001444s ]
  6. SELECT * FROM `set` [ RunTime:0.000611s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001458s ]
  8. SELECT * FROM `article` WHERE `id` = 711318 LIMIT 1 [ RunTime:0.006369s ]
  9. UPDATE `article` SET `lasttime` = 1780596342 WHERE `id` = 711318 [ RunTime:0.012154s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000407s ]
  11. SELECT * FROM `article` WHERE `id` < 711318 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000664s ]
  12. SELECT * FROM `article` WHERE `id` > 711318 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000451s ]
  13. SELECT * FROM `article` WHERE `id` < 711318 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002174s ]
  14. SELECT * FROM `article` WHERE `id` < 711318 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003268s ]
  15. SELECT * FROM `article` WHERE `id` < 711318 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014118s ]
0.237825s