修正 FileSystemObserver 未能持续监听问题 by cyfung1031 · Pull Request #1160 · scriptscat/scriptcat
| const getHandleRecord = async (root: FileSystemFileHandle, observer: FileSystemObserverInstance) => { | ||
| for (const [fileHandle, ftInfo, fileObserver] of handleRecords) { | ||
| if (fileObserver !== observer) continue; | ||
| try { | ||
| const isSame = await root.isSameEntry(fileHandle); | ||
| if (!isSame) continue; | ||
| const file = await root.getFile(); | ||
| if (file && file.lastModified > 0) { | ||
| return { ftInfo, file }; | ||
| } | ||
| } catch (e) { | ||
| // 档案改名或删掉时，或会被此捕捉（预期报错） | ||
| console.warn(e); | ||
| ftInfo.onFileError(); | ||
| } | ||
| } | ||
| return { ftInfo: null, file: null }; | ||
| }; | ||
|
|
||
| const callback = async (records: FileSystemChangeRecord[], observer: FileSystemObserverInstance) => { | ||
| for (const record of records) { | ||
| const { root, type } = record; | ||
| if (!(root instanceof FileSystemFileHandle) || type !== "modified") continue; | ||
| for (const [fileHandle, ftInfo, fileObserver] of handleRecords) { | ||
| if (fileObserver !== observer) continue; | ||
| try { | ||
| const isSame = await root.isSameEntry(fileHandle); | ||
| if (!isSame) continue; | ||
| // 调用安装 | ||
| const file = await root.getFile(); | ||
| // 避免重复更新 | ||
| try { | ||
| for (const record of records) { | ||
| const { root, type } = record; | ||
| if (!(root instanceof FileSystemFileHandle)) continue; | ||
| // 只要 FileSystemObserver 侦测到档案改变，就试一下找记录和读档 | ||
| const { ftInfo, file } = await getHandleRecord(root, observer); | ||
| // 如没有记录或读档失败则忽略 | ||
| if (!ftInfo || !file) continue; | ||
| // 读档成功且有效 （ 文字档考虑 ==UserScript== 等东西，至少应有 30 bytes ) | ||
| if (file.size > 30) { | ||
| // 如成功读档但显示为失败，则重新 observe | ||
| if (type === "errored") { | ||
| observer.observe(root); | ||
| } | ||
| // 以 lastModified 判断避免重复更新 | ||
| if (ftInfo.lastModified === file.lastModified) continue; | ||
| ftInfo.lastModified = file.lastModified; | ||
| const code = await file.text(); | ||
| if (code && typeof code === "string") { | ||
| ftInfo.setCode(code, false); | ||
| } | ||
| } catch (e) { | ||
| console.warn(e); | ||
| } | ||
| } | ||
| } catch (e) { | ||
| // 捕捉其他非遇期错误 | ||
| console.warn(e); | ||
| } | ||
| }; |