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carsonxu
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Feb 4, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| var util = require('./util'); | ||
|
|
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| // 按照文件特征值，缓存 UploadId | ||
| var cacheKey = 'cos_sdk_upload_cache'; | ||
| var expires = 30 * 24 * 3600; | ||
| var cache; | ||
| var timer; | ||
|
|
||
| var init = function () { | ||
| if (cache) return; | ||
| cache = JSON.parse(localStorage.getItem(cacheKey) || '[]') || []; | ||
| // 清理太老旧的数据 | ||
| var changed = false; | ||
| var now = Math.round(Date.now() / 1000); | ||
| for (var i = cache.length - 1; i >= 0; i--) { | ||
| var mtime = cache[i][2]; | ||
| if (!mtime || mtime + expires < now) { | ||
| cache.splice(i, 1); | ||
| changed = true; | ||
| } | ||
| } | ||
| changed && localStorage.setItem(cacheKey, JSON.stringify(cache)); | ||
| }; | ||
|
|
||
| // 把缓存存到本地 | ||
| var save = function () { | ||
| if (timer) return; | ||
| timer = setTimeout(function () { | ||
| localStorage.setItem(cacheKey, JSON.stringify(cache)); | ||
| timer = null; | ||
| }, 400); | ||
| }; | ||
|
|
||
| var mod = { | ||
| using: {}, | ||
| // 标记 UploadId 正在使用 | ||
| setUsing: function (uuid) { | ||
| mod.using[uuid] = true; | ||
| }, | ||
| // 标记 UploadId 已经没在使用 | ||
| removeUsing: function (uuid) { | ||
| delete mod.using[uuid]; | ||
| }, | ||
| // 用上传参数生成哈希值 | ||
| getFileId: function (file, ChunkSize, Bucket, Key) { | ||
| if (file.name && file.size && file.lastModifiedDate && ChunkSize) { | ||
| return util.md5([file.name, file.size, file.lastModifiedDate, ChunkSize, Bucket, Key].join('::')); | ||
| } else { | ||
| return null; | ||
| } | ||
| }, | ||
| // 获取文件对应的 UploadId 列表 | ||
| getUploadIdList: function (uuid) { | ||
| if (!uuid) return null; | ||
| init(); | ||
| var list = []; | ||
| for (var i = 0; i < cache.length; i++) { | ||
| if (cache[i][0] === uuid) | ||
| list.push(cache[i][1]); | ||
| } | ||
| return list.length ? list : null; | ||
| }, | ||
| // 缓存 UploadId | ||
| saveUploadId: function (uuid, UploadId, limit) { | ||
| init(); | ||
| if (!uuid) return; | ||
| // 清理没用的 UploadId | ||
| for (var i = cache.length - 1; i >= 0; i--) { | ||
| var item = cache[i]; | ||
| if (item[0] === uuid && item[1] === UploadId) { | ||
| cache.splice(i, 1); | ||
| } | ||
| } | ||
| cache.unshift([uuid, UploadId, Math.round(Date.now() / 1000)]); | ||
| if (cache.length > limit) cache.splice(limit); | ||
| save(); | ||
| }, | ||
| // UploadId 已用完，移除掉 | ||
| removeUploadId: function (UploadId) { | ||
| init(); | ||
| delete mod.using[UploadId]; | ||
| for (var i = cache.length - 1; i >= 0; i--) { | ||
| if (cache[i][1] === UploadId) cache.splice(i, 1) | ||
| } | ||
| save(); | ||
| }, | ||
| }; | ||
|
|
||
| module.exports = mod; |
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