36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
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/**
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* 功能：缓存一次资源保存流程中已经完成的头像上传结果。
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* 版本：v1.0.0
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*/
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export type AvatarUpload = (file: File) => Promise<{ uri: string }>;
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/** 创建头像上传缓存；选择新文件或清除头像时由调用方主动重置。 */
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export function createAvatarUploadCache(upload: AvatarUpload) {
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let cachedFile: File | undefined;
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let cachedURI: Promise<string> | undefined;
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/** 返回当前文件的受控资源地址；同一文件重试时复用首次成功结果。 */
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async function resolve(file: File) {
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if (cachedFile !== file || !cachedURI) {
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cachedFile = file;
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cachedURI = upload(file)
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.then((result) => result.uri)
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.catch((error) => {
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// 上传本身失败时清空缓存，允许用户直接重试。
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if (cachedFile === file) cachedURI = undefined;
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throw error;
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});
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}
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return cachedURI;
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}
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/** 清空已上传地址，确保新选择的文件不会错误复用旧头像。 */
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function reset() {
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cachedFile = undefined;
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cachedURI = undefined;
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}
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return { resolve, reset };
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}
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