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Go

/*
* Copyright 2025 CloudWeGo Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package eino
import (
"context"
"encoding/json"
"strings"
"github.com/RanFeng/ilog"
"github.com/cloudwego/eino-ext/components/tool/mcp"
"github.com/cloudwego/eino/components/tool"
"github.com/cloudwego/eino/compose"
"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/consts"
"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/infra"
"github.com/cloudwego/eino-examples/flow/agent/deer-go/biz/model"
)
func search(ctx context.Context, name string, opts ...any) (output string, err error) {
var searchTool tool.InvokableTool
for _, cli := range infra.MCPServer {
if searchTool != nil {
break
}
ts, err := mcp.GetTools(ctx, &mcp.Config{Cli: cli})
if err != nil {
ilog.EventError(ctx, err, "builder_error")
continue
}
for _, t := range ts {
info, _ := t.Info(ctx)
if strings.HasSuffix(info.Name, "search") {
searchTool, _ = t.(tool.InvokableTool)
break
}
}
}
err = compose.ProcessState[*model.State](ctx, func(_ context.Context, state *model.State) error {
args := map[string]any{
"query": state.Messages[len(state.Messages)-1].Content,
}
argsBytes, err := json.Marshal(args)
if err != nil {
ilog.EventError(ctx, err, "json_marshal_error")
return err
}
result, err := searchTool.InvokableRun(ctx, string(argsBytes))
if err != nil {
ilog.EventError(ctx, err, "search_result_error")
}
ilog.EventDebug(ctx, "back_search_result", "result", result)
state.BackgroundInvestigationResults = result
return nil
})
return output, err
}
func bIRouter(ctx context.Context, input string, opts ...any) (output string, err error) {
err = compose.ProcessState[*model.State](ctx, func(_ context.Context, state *model.State) error {
defer func() {
output = state.Goto
}()
state.Goto = consts.Planner
return nil
})
return output, nil
}
func NewBAgent[I, O any](ctx context.Context) *compose.Graph[I, O] {
cag := compose.NewGraph[I, O]()
_ = cag.AddLambdaNode("search", compose.InvokableLambdaWithOption(search))
_ = cag.AddLambdaNode("router", compose.InvokableLambdaWithOption(bIRouter))
_ = cag.AddEdge(compose.START, "search")
_ = cag.AddEdge("search", "router")
_ = cag.AddEdge("router", compose.END)
return cag
}