weichenandCursor
6fd1d441a9
Why: Old tool results were filling the window, compaction could split a tool group or commit a stale summary, and reminders arrived as extra user messages. Evidence: Compaction retries a conflict and opens the circuit after three failures; clearing keeps the last five tool results; a stale file write is rejected; RPC reports started, queued, or handled. Impact: Requests over the context window replace older tool results with a placeholder. Rewriting an existing file now requires a read in the same run. Subagent text over 32000 characters is capped. Refs: feature/context-engineering Co-authored-by: Cursor <cursoragent@cursor.com>
64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
// Package filestate 记录本轮读过的文件，并在改写前核对修改时间与大小。
|
|
package filestate
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
type stamp struct {
|
|
mod time.Time
|
|
size int64
|
|
}
|
|
|
|
// Tracker 是一次 run 内的读取记录。nil 接收者表示不检查。
|
|
type Tracker struct {
|
|
mu sync.Mutex
|
|
seen map[string]stamp
|
|
}
|
|
|
|
func New() *Tracker {
|
|
return &Tracker{seen: map[string]stamp{}}
|
|
}
|
|
|
|
// NoteRead 记下当前的修改时间与大小。
|
|
func (t *Tracker) NoteRead(path string) error {
|
|
if t == nil {
|
|
return nil
|
|
}
|
|
info, err := os.Stat(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
t.mu.Lock()
|
|
t.seen[path] = stamp{mod: info.ModTime(), size: info.Size()}
|
|
t.mu.Unlock()
|
|
return nil
|
|
}
|
|
|
|
// CheckWrite 允许新建。已存在的文件必须在本轮读过，且修改时间与大小未变。
|
|
func (t *Tracker) CheckWrite(path string) error {
|
|
if t == nil {
|
|
return nil
|
|
}
|
|
info, err := os.Stat(path)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
t.mu.Lock()
|
|
got, ok := t.seen[path]
|
|
t.mu.Unlock()
|
|
if !ok {
|
|
return fmt.Errorf("请先读取该文件再修改：%s", path)
|
|
}
|
|
if !got.mod.Equal(info.ModTime()) || got.size != info.Size() {
|
|
return fmt.Errorf("文件在读取后已变化，请重新读取：%s", path)
|
|
}
|
|
return nil
|
|
}
|