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multiagent/plan_execute_executor.go

@@ -0,0 +1,77 @@
+package multiagent
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/cloudwego/eino/adk"
+	"github.com/cloudwego/eino/adk/prebuilt/planexecute"
+)
+
+// newPlanExecuteExecutor 与 planexecute.NewExecutor 行为一致，但可为执行器注入 Handlers（例如 summarization 中间件）。
+func newPlanExecuteExecutor(ctx context.Context, cfg *planexecute.ExecutorConfig, handlers []adk.ChatModelAgentMiddleware) (adk.Agent, error) {
+	if cfg == nil {
+		return nil, fmt.Errorf("plan_execute: ExecutorConfig 为空")
+	}
+	if cfg.Model == nil {
+		return nil, fmt.Errorf("plan_execute: Executor Model 为空")
+	}
+	genInputFn := cfg.GenInputFn
+	if genInputFn == nil {
+		genInputFn = planExecuteDefaultGenExecutorInput
+	}
+	genInput := func(ctx context.Context, instruction string, _ *adk.AgentInput) ([]adk.Message, error) {
+		plan, ok := adk.GetSessionValue(ctx, planexecute.PlanSessionKey)
+		if !ok {
+			return nil, fmt.Errorf("plan_execute executor: session value %q missing (possible session corruption)", planexecute.PlanSessionKey)
+		}
+		plan_ := plan.(planexecute.Plan)
+
+		userInput, ok := adk.GetSessionValue(ctx, planexecute.UserInputSessionKey)
+		if !ok {
+			return nil, fmt.Errorf("plan_execute executor: session value %q missing (possible session corruption)", planexecute.UserInputSessionKey)
+		}
+		userInput_ := userInput.([]adk.Message)
+
+		var executedSteps_ []planexecute.ExecutedStep
+		executedStep, ok := adk.GetSessionValue(ctx, planexecute.ExecutedStepsSessionKey)
+		if ok {
+			executedSteps_ = executedStep.([]planexecute.ExecutedStep)
+		}
+
+		in := &planexecute.ExecutionContext{
+			UserInput:     userInput_,
+			Plan:          plan_,
+			ExecutedSteps: executedSteps_,
+		}
+		return genInputFn(ctx, in)
+	}
+
+	agentCfg := &adk.ChatModelAgentConfig{
+		Name:          "executor",
+		Description:   "an executor agent",
+		Model:         cfg.Model,
+		ToolsConfig:   cfg.ToolsConfig,
+		GenModelInput: genInput,
+		MaxIterations: cfg.MaxIterations,
+		OutputKey:     planexecute.ExecutedStepSessionKey,
+	}
+	if len(handlers) > 0 {
+		agentCfg.Handlers = handlers
+	}
+	return adk.NewChatModelAgent(ctx, agentCfg)
+}
+
+// planExecuteDefaultGenExecutorInput 对齐 Eino planexecute.defaultGenExecutorInputFn（包外不可引用默认实现）。
+func planExecuteDefaultGenExecutorInput(ctx context.Context, in *planexecute.ExecutionContext) ([]adk.Message, error) {
+	planContent, err := in.Plan.MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+	return planexecute.ExecutorPrompt.Format(ctx, map[string]any{
+		"input":          planExecuteFormatInput(in.UserInput),
+		"plan":           string(planContent),
+		"executed_steps": planExecuteFormatExecutedSteps(in.ExecutedSteps, nil, nil),
+		"step":           in.Plan.FirstStep(),
+	})
+}