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/*
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* Copyright 2025 CloudWeGo Authors
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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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*/
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// Code generated by hertz generator.
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package handler
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import (
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"context"
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"encoding/json"
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"net/http"
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"github.com/RanFeng/ilog"
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"github.com/cloudwego/eino/compose"
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"github.com/cloudwego/hertz/pkg/app"
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"github.com/cloudwego/hertz/pkg/protocol/sse"
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"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/consts"
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"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/eino"
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"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/infra"
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"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/model"
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"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/util"
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)
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func ChatStreamEino(ctx context.Context, c *app.RequestContext) {
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// 设置响应头（NewStream 会自动设置部分头，但建议显式声明）
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c.SetContentType("text/event-stream; charset=utf-8")
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c.Response.Header.Set("Cache-Control", "no-cache")
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c.Response.Header.Set("Connection", "keep-alive")
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c.Response.Header.Set("Access-Control-Allow-Origin", "*")
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c.SetStatusCode(http.StatusOK)
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// 初始化一个sse writer
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w := sse.NewWriter(c)
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defer w.Close()
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// 请求体校验
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req := new(model.ChatRequest)
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err := c.BindAndValidate(req)
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if err != nil {
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return
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}
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ilog.EventInfo(ctx, "ChatStream_begin", "req", req)
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// 根据前端参数生成Graph State
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genFunc := func(ctx context.Context) *model.State {
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return &model.State{
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MaxPlanIterations: req.MaxPlanIterations,
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MaxStepNum: req.MaxStepNum,
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Messages: req.Messages,
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Goto: consts.Coordinator,
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EnableBackgroundInvestigation: req.EnableBackgroundInvestigation,
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}
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}
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// Build Graph
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r := eino.Builder[string, string, *model.State](ctx, genFunc)
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// Run Graph
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_, err = r.Stream(ctx, consts.Coordinator,
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compose.WithCheckPointID(req.ThreadID), // 指定Graph的CheckPointID
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// 中断后，获取用户的edit_plan信息
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compose.WithStateModifier(func(ctx context.Context, path compose.NodePath, state any) error {
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s := state.(*model.State)
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s.InterruptFeedback = req.InterruptFeedback
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if req.InterruptFeedback == "edit_plan" {
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s.Messages = append(s.Messages, req.Messages...)
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}
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ilog.EventDebug(ctx, "ChatStream_modf", "path", path.GetPath(), "state", state)
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return nil
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}),
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// 连接LoggerCallback
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compose.WithCallbacks(&infra.LoggerCallback{
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ID: req.ThreadID,
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SSE: w,
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}),
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)
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// 将interrupt信号传递到前端
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if info, ok := compose.ExtractInterruptInfo(err); ok {
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ilog.EventDebug(ctx, "ChatStream_interrupt", "info", info)
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data := &model.ChatResp{
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ThreadID: req.ThreadID,
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ID: "human_feedback:" + util.RandStr(20),
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Role: "assistant",
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Content: "检查计划",
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FinishReason: "interrupt",
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Options: []map[string]any{
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{
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"text": "编辑计划",
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"value": "edit_plan",
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},
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{
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"text": "开始执行",
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"value": "accepted",
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},
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},
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}
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dB, _ := json.Marshal(data)
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w.WriteEvent("", "interrupt", dB)
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}
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if err != nil {
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ilog.EventError(ctx, err, "ChatStream_error")
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}
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}
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