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87 lines
3.0 KiB
Go
87 lines
3.0 KiB
Go
/*
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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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// This example shows how to configure the jsonfix middleware on a ToolsNode
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// to repair invalid JSON arguments before invoking a local tool.
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// Run: go run ./components/tool/middlewares/jsonfix/example
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package main
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import (
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"context"
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"fmt"
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"github.com/cloudwego/eino/components/tool"
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"github.com/cloudwego/eino/components/tool/utils"
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"github.com/cloudwego/eino/compose"
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"github.com/cloudwego/eino/schema"
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"github.com/cloudwego/eino-examples/components/tool/middlewares/errorremover"
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)
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type WebSearch struct {
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URL string `json:"url"`
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}
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func main() {
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ctx := context.Background()
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// 1. Create a mock "web_search" tool.
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// This tool is designed to always return an error to demonstrate the middleware's functionality.
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searcher, _ := utils.InferTool("web_search", "search content for web url", func(ctx context.Context, in *WebSearch) (string, error) {
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// The tool call always fails.
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return "", fmt.Errorf("not found web url")
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})
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// 2. Create a compose.ToolNode and inject the remove_error middleware.
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// This middleware will intercept the tool execution lifecycle.
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//
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// IMPORTANT: Middleware order is critical. To catch errors from any subsequent
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// middleware or from the tool itself, `remove_error.Middleware()` must be placed
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// at the beginning of the `ToolCallMiddlewares` slice. Any middleware placed
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// before it will not have its errors handled by this mechanism due to the
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// sequential nature of middleware execution.
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tn, _ := compose.NewToolNode(ctx, &compose.ToolsNodeConfig{
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Tools: []tool.BaseTool{searcher},
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ToolCallMiddlewares: []compose.ToolMiddleware{errorremover.Middleware()}, // Inject the remove_error middleware.
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})
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msg := schema.AssistantMessage("", []schema.ToolCall{
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{
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ID: "1",
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Function: schema.FunctionCall{
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Name: "web_search",
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Arguments: `{"url":"web_url"}`,
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},
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},
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})
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// 4. Simulate a tool call.
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// Although the underlying 'web_search' tool fails, the 'Invoke' call will succeed.
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// This is because the middleware catches the error and replaces the output with the result from the registered handler.
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outs, err := tn.Invoke(ctx, msg)
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if err != nil {
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fmt.Println("error:", err)
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return
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}
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// 5. Print the result.
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// The output content will be the string returned by the error handler, not the original error message.
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for _, o := range outs {
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fmt.Println("tool:", o.ToolName, "id:", o.ToolCallID, "content:", o.Content)
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}
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}
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