reject 选项，该选项通过抛出错误来拒绝图的新运行，并继续执行原始运行直至完成。以下是使用 reject 选项的快速示例。
设置
首先，我们将定义一个快速辅助函数，用于打印 JS 和 CURL 模型输出（如果您使用 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);
}
# 将此内容放入名为 pretty_print.sh 的文件中
pretty_print() {
local type="$1"
local content="$2"
local padded=" $type "
local total_width=80
local sep_len=$(( (total_width - ${#padded}) / 2 ))
local sep=$(printf '=%.0s' $(eval "echo {1.."${sep_len}"}"))
local second_sep=$sep
if (( (total_width - ${#padded}) % 2 )); then
second_sep="${second_sep}="
fi
echo "${sep}${padded}${second_sep}"
echo
echo "$content"
}
- Python
- Javascript
- CURL
import httpx
from langchain_core.messages import convert_to_messages
from langgraph_sdk import get_client
client = get_client(url=<DEPLOYMENT_URL>)
# 使用以 "agent" 名称部署的图
assistant_id = "agent"
thread = await client.threads.create()
import { Client } from "@langchain/langgraph-sdk";
const client = new Client({ apiUrl: <DEPLOYMENT_URL> });
// 使用以 "agent" 名称部署的图
const assistantId = "agent";
const thread = await client.threads.create();
curl --request POST \
--url <DEPLOYMENT_URL>/threads \
--header 'Content-Type: application/json' \
--data '{}'
创建运行
现在我们可以运行一个线程，并尝试使用 “reject” 选项运行第二个线程，这应该会失败，因为我们已经启动了一个运行：- Python
- Javascript
- CURL
run = await client.runs.create(
thread["thread_id"],
assistant_id,
input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
)
try:
await client.runs.create(
thread["thread_id"],
assistant_id,
input={
"messages": [{"role": "user", "content": "what's the weather in nyc?"}]
},
multitask_strategy="reject",
)
except httpx.HTTPStatusError as e:
print("Failed to start concurrent run", e)
const run = await client.runs.create(
thread["thread_id"],
assistantId,
input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
);
try {
await client.runs.create(
thread["thread_id"],
assistantId,
{
input: {"messages": [{"role": "user", "content": "what's the weather in nyc?"}]},
multitask_strategy:"reject"
},
);
} catch (e) {
console.error("Failed to start concurrent run", e);
}
curl --request POST \
--url <DEPLOY<ENT_URL>>/threads/<THREAD_ID>/runs \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what\'s the weather in sf?\"}]},
}" && curl --request POST \
--url <DEPLOY<ENT_URL>>/threads/<THREAD_ID>/runs \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what\'s the weather in nyc?\"}]},
\"multitask_strategy\": \"reject\"
}" || { echo "Failed to start concurrent run"; echo "Error: $?" >&2; }
Failed to start concurrent run Client error '409 Conflict' for url 'http://localhost:8123/threads/f9e7088b-8028-4e5c-88d2-9cc9a2870e50/runs'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/409
查看运行结果
我们可以验证原始线程已完成执行：- Python
- Javascript
- CURL
# 等待原始运行完成
await client.runs.join(thread["thread_id"], run["run_id"])
state = await client.threads.get_state(thread["thread_id"])
for m in convert_to_messages(state["values"]["messages"]):
m.pretty_print()
await client.runs.join(thread["thread_id"], run["run_id"]);
const state = await client.threads.getState(thread["thread_id"]);
for (const m of state["values"]["messages"]) {
prettyPrint(m);
}
source pretty_print.sh && curl --request GET \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/<RUN_ID>/join && \
curl --request GET --url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state | \
jq -c '.values.messages[]' | while read -r element; do
type=$(echo "$element" | jq -r '.type')
content=$(echo "$element" | jq -r '.content | if type == "array" then tostring else . end')
pretty_print "$type" "$content"
done
================================ 人类消息 =================================
what's the weather in sf?
================================== AI 消息 ==================================
[{'id': 'toolu_01CyewEifV2Kmi7EFKHbMDr1', 'input': {'query': 'weather in san francisco'}, 'name': 'tavily_search_results_json', 'type': 'tool_use'}]
工具调用:
tavily_search_results_json (toolu_01CyewEifV2Kmi7EFKHbMDr1)
调用 ID: toolu_01CyewEifV2Kmi7EFKHbMDr1
参数:
query: weather in san francisco
================================= 工具消息 =================================
名称: tavily_search_results_json
[{"url": "https://www.accuweather.com/en/us/san-francisco/94103/june-weather/347629", "content": "Get the monthly weather forecast for San Francisco, CA, including daily high/low, historical averages, to help you plan ahead."}]
================================== AI 消息 ==================================
根据 Tavily 的搜索结果，旧金山当前的天气情况如下：
旧金山六月的平均最高气温约为 65°F (18°C)，平均最低气温约为 54°F (12°C)。由于夏季常笼罩城市的海洋雾层，六月往往是旧金山较凉爽、多雾的月份之一。
关于旧金山典型六月天气的一些要点：
* 气温温和，最高气温在 60 多华氏度，最低气温在 50 多华氏度
* 多雾的早晨通常会在晴朗的下午消散
* 降雨极少或没有，因为六月处于旱季
* 有微风，风来自太平洋
* 建议穿着分层衣物以应对变化的天气条件
总之，在这个时节，您可以期待旧金山温和、多雾的早晨，随后是晴朗但凉爽的下午。与加州其他地区相比，海洋层使六月的气温保持适中。
将这些文档连接到 Claude、VSCode 等，通过 MCP 获取实时答案。