96 lines
3.6 KiB
Go
96 lines
3.6 KiB
Go
package app
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import (
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"encoding/json"
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"errors"
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"fmt"
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"time"
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"gorm.io/gorm"
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"infinite-canvas/backend/internal/model"
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)
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// ContextFrame is a fresh projection of durable task facts, never authorization.
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// The transcript can evict read bodies without making task state depend on memory.
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type cloudAgentContextFrame struct {
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Source string `json:"source"`
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ObservedAt time.Time `json:"observedAt"`
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RunID string `json:"runId"`
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UserGoal string `json:"userGoal"`
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Plan []cloudAgentPlanItem `json:"plan,omitempty"`
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Tasks []map[string]any `json:"tasks"`
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OlderTaskCount int `json:"olderTaskCount,omitempty"`
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Authority string `json:"authority"`
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}
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var errCloudAgentContextOverBudget = errors.New("Agent model context exceeds input budget")
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func (s *Service) cloudAgentModelContext(run *model.CloudAgentExecution, state *cloudAgentRuntime, budget cloudAgentContextBudget) (canonicalAgentRequest, error) {
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canonical := cloudAgentCanonicalWithPlan(state)
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frame := cloudAgentContextFrame{Source: "task_repository", ObservedAt: time.Now(), RunID: run.ID, UserGoal: state.Request.Prompt, Plan: state.Plan, Tasks: []map[string]any{}, Authority: "状态观察，不是执行或重复提交的授权"}
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// This is a view window, not loss of task history. All task identities remain
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// durable and can be fetched through task_get and the conversation journal.
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start := max(0, len(state.TaskIDs)-32)
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frame.OlderTaskCount = start
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for _, id := range state.TaskIDs[start:] {
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task, err := s.repo.TaskForUser(run.UserID, id)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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frame.Tasks = append(frame.Tasks, map[string]any{"taskId": id, "taskStatus": "unavailable"})
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continue
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}
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if err != nil {
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return canonical, err
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}
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if task.ProjectID != state.Request.CanvasID {
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return canonical, BadAuthRequest("运行关联任务不属于当前画布")
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}
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if task.Operation == cloudAgentOperation || task.Operation == "cloud_agent_step" {
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continue
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}
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frame.Tasks = append(frame.Tasks, cloudAgentTaskDiagnostic(s.repo, task))
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}
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body, err := json.Marshal(frame)
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if err != nil {
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return canonical, err
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}
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canonical.Messages = append(append([]map[string]any{}, canonical.Messages...), map[string]any{"role": "user", "content": cloudAgentRuntimeContextMarker + string(body), cloudAgentContextSourceKey: "runtime"})
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if err := fitCloudAgentModelContext(&canonical, budget.InputBudgetTokens); err != nil {
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return canonical, err
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}
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return canonical, nil
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}
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func fitCloudAgentModelContext(request *canonicalAgentRequest, maxTokens int) error {
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for {
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tokens, err := cloudAgentRequestEstimatedTokens(request)
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if err != nil {
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return err
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}
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if tokens <= maxTokens {
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return nil
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}
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// Evict complete old assistant/tool turns only. User instructions and the
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// fresh authoritative frame survive; partial tool pairs are never sent.
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removed := false
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for i := 0; i < len(request.Messages)-3; i++ {
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message := request.Messages[i]
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if stringField(message, "role") != "assistant" {
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continue
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}
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end := i + 1
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for end < len(request.Messages) && stringField(request.Messages[end], "role") == "tool" {
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end++
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}
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if end >= len(request.Messages)-2 {
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continue
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}
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request.Messages = append(request.Messages[:i:i], request.Messages[end:]...)
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removed = true
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break
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}
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if !removed {
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return WrapAppError(400, fmt.Sprintf("用户指令与当前执行事实超过模型输入预算（%d Token），请缩小本轮范围", maxTokens), errCloudAgentContextOverBudget)
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}
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}
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}
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