本指南假设您了解什么是双重发送，您可以在双重发送概念指南中了解。 本指南涵盖双重发送的 interrupt 选项，它中断图的先前运行并使用双重发送开始新运行。此选项不会删除第一次运行，而是将其保留在数据库中但将其状态设置为 interrupted。下面是使用 interrupt 选项的快速示例。

​
设置

首先，我们将定义一个快速辅助函数来打印 JS 和 CURL 模型输出（如果使用 Python，可以跳过此步骤）：
  • Javascript
  • CURL
function prettyPrint(m) {
  const padded = " " + m['type'] + " ";
  const sepLen = Math.floor((80 - padded.length) / 2);
  const sep = "=".repeat(sepLen);
  const secondSep = sep + (padded.length % 2 ? "=" : "");

  console.log(`${sep}${padded}${secondSep}`);
  console.log("\n\n");
  console.log(m.content);
}
现在，让我们导入所需的包并实例化客户端、助手和线程。
  • Python
  • Javascript
  • CURL
import asyncio

from langchain_core.messages import convert_to_messages
from langgraph_sdk import get_client

client = get_client(url=<DEPLOYMENT_URL>)
# 使用名为"agent"的已部署图
assistant_id = "agent"
thread = await client.threads.create()

​
创建运行

现在我们可以启动两次运行并加入第二次运行，直到它完成：
  • Python
  • Javascript
  • CURL
# the first run will be interrupted
interrupted_run = await client.runs.create(
    thread["thread_id"],
    assistant_id,
    input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
)
# sleep a bit to get partial outputs from the first run
await asyncio.sleep(2)
run = await client.runs.create(
    thread["thread_id"],
    assistant_id,
    input={"messages": [{"role": "user", "content": "what's the weather in nyc?"}]},
    multitask_strategy="interrupt",
)
# wait until the second run completes
await client.runs.join(thread["thread_id"], run["run_id"])

​
View run results

We can see that the thread has partial data from the first run + data from the second run
  • Python
  • Javascript
  • CURL
state = await client.threads.get_state(thread["thread_id"])

for m in convert_to_messages(state["values"]["messages"]):
    m.pretty_print()
Output: 
================================ Human Message =================================

what's the weather in sf?
================================== Ai Message ==================================

[{'id': 'toolu_01MjNtVJwEcpujRGrf3x6Pih', 'input': {'query': 'weather in san francisco'}, 'name': 'tavily_search_results_json', 'type': 'tool_use'}]
Tool Calls:
tavily_search_results_json (toolu_01MjNtVJwEcpujRGrf3x6Pih)
Call ID: toolu_01MjNtVJwEcpujRGrf3x6Pih
Args:
query: weather in san francisco
================================= Tool Message =================================
Name: tavily_search_results_json

[{"url": "https://www.wunderground.com/hourly/us/ca/san-francisco/KCASANFR2002/date/2024-6-18", "content": "High 64F. Winds W at 10 to 20 mph. A few clouds from time to time. Low 49F. Winds W at 10 to 20 mph. Temp. San Francisco Weather Forecasts. Weather Underground provides local & long-range weather ..."}]
================================ Human Message =================================

what's the weather in nyc?
================================== Ai Message ==================================

[{'id': 'toolu_01KtE1m1ifPLQAx4fQLyZL9Q', 'input': {'query': 'weather in new york city'}, 'name': 'tavily_search_results_json', 'type': 'tool_use'}]
Tool Calls:
tavily_search_results_json (toolu_01KtE1m1ifPLQAx4fQLyZL9Q)
Call ID: toolu_01KtE1m1ifPLQAx4fQLyZL9Q
Args:
query: weather in new york city
================================= Tool Message =================================
Name: tavily_search_results_json

[{"url": "https://www.accuweather.com/en/us/new-york/10021/june-weather/349727", "content": "Get the monthly weather forecast for New York, NY, including daily high/low, historical averages, to help you plan ahead."}]
================================== Ai Message ==================================

The search results provide weather forecasts and information for New York City. Based on the top result from AccuWeather, here are some key details about the weather in NYC:

* This is a monthly weather forecast for New York City for the month of June.
* It includes daily high and low temperatures to help plan ahead.
* Historical averages for June in NYC are also provided as a reference point.
* More detailed daily or hourly forecasts with precipitation chances, humidity, wind, etc. can be found by visiting the AccuWeather page.

So in summary, the search provides a convenient overview of the expected weather conditions in New York City over the next month to give you an idea of what to prepare for if traveling or making plans there. Let me know if you need any other details!
Verify that the original, interrupted run was interrupted
  • Python
  • Javascript
print((await client.runs.get(thread["thread_id"], interrupted_run["run_id"]))["status"])
Output: 
'interrupted'
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