var util = require('./util');
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// 按照文件特征值，缓存 UploadId
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var cacheKey = 'cos_sdk_upload_cache';
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var expires = 30 * 24 * 3600;
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var cache;
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var timer;
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var getCache = function () {
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try {
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var val = JSON.parse(wx.getStorageSync(cacheKey));
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} catch (e) {
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}
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if (!val) val = [];
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return val;
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};
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var setCache = function () {
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try {
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wx.setStorageSync(cacheKey, JSON.stringify(cache))
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} catch (e) {
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}
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};
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var init = function () {
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if (cache) return;
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cache = getCache();
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// 清理太老旧的数据
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var changed = false;
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var now = Math.round(Date.now() / 1000);
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for (var i = cache.length - 1; i >= 0; i--) {
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var mtime = cache[i][2];
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if (!mtime || mtime + expires < now) {
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cache.splice(i, 1);
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changed = true;
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}
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}
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changed && setCache();
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};
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// 把缓存存到本地
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var save = function () {
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if (timer) return;
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timer = setTimeout(function () {
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setCache();
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timer = null;
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}, 400);
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};
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var mod = {
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using: {},
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// 标记 UploadId 正在使用
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setUsing: function (uuid) {
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mod.using[uuid] = true;
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},
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// 标记 UploadId 已经没在使用
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removeUsing: function (uuid) {
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delete mod.using[uuid];
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},
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// 用上传参数生成哈希值
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getFileId: function (FileStat, ChunkSize, Bucket, Key) {
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if (FileStat.FilePath && FileStat.size && FileStat.lastModifiedTime && ChunkSize) {
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return util.md5([FileStat.FilePath].join('::')) + '-' + util.md5([FileStat.size, FileStat.mode, FileStat.lastAccessedTime, FileStat.lastModifiedTime, ChunkSize, Bucket, Key].join('::'));
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} else {
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return null;
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}
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},
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// 获取文件对应的 UploadId 列表
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getUploadIdList: function (uuid) {
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if (!uuid) return null;
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init();
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var list = [];
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for (var i = 0; i < cache.length; i++) {
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if (cache[i][0] === uuid)
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list.push(cache[i][1]);
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}
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return list.length ? list : null;
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},
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// 缓存 UploadId
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saveUploadId: function (uuid, UploadId, limit) {
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init();
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if (!uuid) return;
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// 清理没用的 UploadId
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var part1 = uuid.substr(0, uuid.indexOf('-') + 1);
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for (var i = cache.length - 1; i >= 0; i--) {
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var item = cache[i];
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if (item[0] === uuid && item[1] === UploadId) {
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cache.splice(i, 1);
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} else if (uuid !== item[0] && item[0].indexOf(part1) === 0) { // 文件路径相同，但其他信息不同，说明文件改变了或上传参数（存储桶、路径、分片大小）变了，直接清理掉
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cache.splice(i, 1);
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}
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}
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cache.unshift([uuid, UploadId, Math.round(Date.now() / 1000)]);
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if (cache.length > limit) cache.splice(limit);
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save();
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},
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// UploadId 已用完，移除掉
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removeUploadId: function (UploadId) {
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init();
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delete mod.using[UploadId];
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for (var i = cache.length - 1; i >= 0; i--) {
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if (cache[i][1] === UploadId) cache.splice(i, 1)
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}
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save();
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},
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};
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module.exports = mod;
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