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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
/* eslint-env mozilla/chrome-worker */
/**
* A worker dedicated for the I/O component of PageThumbs storage.
*/
"use strict";
/* import-globals-from /toolkit/components/workerloader/require.js */
importScripts("resource://gre/modules/workers/require.js");
var PromiseWorker = require("resource://gre/modules/workers/PromiseWorker.js");
var worker = new PromiseWorker.AbstractWorker();
worker.dispatch = function(method, args = []) {
return Agent[method](...args);
};
worker.postMessage = function(message, ...transfers) {
self.postMessage(message, ...transfers);
};
worker.close = function() {
self.close();
};
self.addEventListener("message", msg => worker.handleMessage(msg));
self.addEventListener("unhandledrejection", function(error) {
throw error.reason;
});
var Agent = {
// Checks if the specified file exists and has an age less than as
// specifed (in seconds).
async isFileRecent(path, maxAge) {
try {
let stat = await IOUtils.stat(path);
let maxDate = new Date();
maxDate.setSeconds(maxDate.getSeconds() - maxAge);
return stat.lastModified > maxDate;
} catch (ex) {
if (!(ex instanceof DOMException)) {
throw ex;
}
// file doesn't exist (or can't be stat'd) - must be stale.
return false;
}
},
async remove(path) {
try {
await IOUtils.remove(path);
return true;
} catch (e) {
return false;
}
},
async expireFilesInDirectory(path, filesToKeep, minChunkSize) {
let entries = await this.getFileEntriesInDirectory(path, filesToKeep);
let limit = Math.max(minChunkSize, Math.round(entries.length / 2));
for (let entry of entries) {
await this.remove(entry);
// Check if we reached the limit of files to remove.
if (--limit <= 0) {
break;
}
}
return true;
},
async getFileEntriesInDirectory(path, skipFiles) {
let children = await IOUtils.getChildren(path);
let skip = new Set(skipFiles);
let entries = [];
for (let entry of children) {
let stat = await IOUtils.stat(entry);
if (stat.type === "regular" && !skip.has(PathUtils.filename(entry))) {
entries.push(entry);
}
}
return entries;
},
async moveOrDeleteAllThumbnails(pathFrom, pathTo) {
await IOUtils.makeDirectory(pathTo);
if (pathFrom == pathTo) {
return true;
}
let children = await IOUtils.getChildren(pathFrom);
for (let entry of children) {
let stat = await IOUtils.stat(entry);
if (stat.type !== "regular") {
continue;
}
let fileName = PathUtils.filename(entry);
let from = PathUtils.join(pathFrom, fileName);
let to = PathUtils.join(pathTo, fileName);
try {
await IOUtils.move(from, to, { noOverwrite: true });
} catch (e) {
await IOUtils.remove(from);
}
}
try {
await IOUtils.remove(pathFrom, { recursive: true });
} catch (e) {
// This could fail if there's something in
// the folder we're not permitted to remove.
}
return true;
},
writeAtomic(path, buffer, options) {
return IOUtils.write(path, buffer, options);
},
makeDir(path, options) {
return IOUtils.makeDirectory(path, options);
},
copy(source, dest, options) {
return IOUtils.copy(source, dest, options);
},
async wipe(path) {
let children = await IOUtils.getChildren(path);
try {
await Promise.all(children.map(entry => IOUtils.remove(entry)));
} catch (ex) {
// If a file cannot be removed, we should still continue.
// This can happen at least for any of the following reasons:
// - access denied;
// - file has been removed recently during a previous wipe
// and the file system has not flushed that yet (yes, this
// can happen under Windows);
// - file has been removed by the user or another process.
}
},
exists(path) {
return IOUtils.exists(path);
},
};
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