split up backupformat logic into separate files
This commit is contained in:
Girish Ramakrishnan
@@ -0,0 +1,250 @@
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'use strict';
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exports = module.exports = {
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getBackupFilePath,
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download,
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upload,
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_saveFsMetadata: saveFsMetadata,
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_restoreFsMetadata: restoreFsMetadata
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};
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const assert = require('assert'),
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async = require('async'),
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BoxError = require('../boxerror.js'),
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DataLayout = require('../datalayout.js'),
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debug = require('debug')('box:backupformat/rsync'),
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fs = require('fs'),
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hush = require('../hush.js'),
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once = require('../once.js'),
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path = require('path'),
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safe = require('safetydance'),
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storage = require('../storage.js'),
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syncer = require('../syncer.js'),
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util = require('util');
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function getBackupFilePath(backupConfig, remotePath) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof remotePath, 'string');
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const rootPath = storage.api(backupConfig.provider).getRootPath(backupConfig);
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return path.join(rootPath, remotePath);
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}
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function sync(backupConfig, remotePath, dataLayout, progressCallback, callback) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof remotePath, 'string');
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof progressCallback, 'function');
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assert.strictEqual(typeof callback, 'function');
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// the number here has to take into account the s3.upload partSize (which is 10MB). So 20=200MB
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const concurrency = backupConfig.syncConcurrency || (backupConfig.provider === 's3' ? 20 : 10);
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const removeDir = util.callbackify(storage.api(backupConfig.provider).removeDir);
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const remove = util.callbackify(storage.api(backupConfig.provider).remove);
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syncer.sync(dataLayout, function processTask(task, iteratorCallback) {
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debug('sync: processing task: %j', task);
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// the empty task.path is special to signify the directory
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const destPath = task.path && backupConfig.encryption ? hush.encryptFilePath(task.path, backupConfig.encryption) : task.path;
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const backupFilePath = path.join(getBackupFilePath(backupConfig, remotePath), destPath);
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if (task.operation === 'removedir') {
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debug(`Removing directory ${backupFilePath}`);
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return removeDir(backupConfig, backupFilePath, progressCallback, iteratorCallback);
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} else if (task.operation === 'remove') {
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debug(`Removing ${backupFilePath}`);
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return remove(backupConfig, backupFilePath, iteratorCallback);
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}
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let retryCount = 0;
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async.retry({ times: 5, interval: 20000 }, function (retryCallback) {
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retryCallback = once(retryCallback); // protect again upload() erroring much later after read stream error
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++retryCount;
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if (task.operation === 'add') {
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progressCallback({ message: `Adding ${task.path}` + (retryCount > 1 ? ` (Try ${retryCount})` : '') });
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debug(`Adding ${task.path} position ${task.position} try ${retryCount}`);
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const stream = hush.createReadStream(dataLayout.toLocalPath('./' + task.path), backupConfig.encryption);
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stream.on('error', (error) => retryCallback(error.message.includes('ENOENT') ? null : error)); // ignore error if file disappears
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stream.on('progress', function (progress) {
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const transferred = Math.round(progress.transferred/1024/1024), speed = Math.round(progress.speed/1024/1024);
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if (!transferred && !speed) return progressCallback({ message: `Uploading ${task.path}` }); // 0M@0MBps looks wrong
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progressCallback({ message: `Uploading ${task.path}: ${transferred}M@${speed}MBps` }); // 0M@0MBps looks wrong
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});
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// only create the destination path when we have confirmation that the source is available. otherwise, we end up with
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// files owned as 'root' and the cp later will fail
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stream.on('open', function () {
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storage.api(backupConfig.provider).upload(backupConfig, backupFilePath, stream, function (error) {
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debug(error ? `Error uploading ${task.path} try ${retryCount}: ${error.message}` : `Uploaded ${task.path}`);
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retryCallback(error);
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});
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});
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}
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}, iteratorCallback);
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}, concurrency, function (error) {
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if (error) return callback(new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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callback();
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});
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}
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// this is not part of 'snapshotting' because we need root access to traverse
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async function saveFsMetadata(dataLayout, metadataFile) {
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof metadataFile, 'string');
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// contains paths prefixed with './'
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const metadata = {
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emptyDirs: [],
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execFiles: [],
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symlinks: []
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};
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// we assume small number of files. spawnSync will raise a ENOBUFS error after maxBuffer
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for (let lp of dataLayout.localPaths()) {
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const emptyDirs = safe.child_process.execSync(`find ${lp} -type d -empty`, { encoding: 'utf8', maxBuffer: 1024 * 1024 * 30 });
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if (emptyDirs === null) throw new BoxError(BoxError.FS_ERROR, `Error finding empty dirs: ${safe.error.message}`);
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if (emptyDirs.length) metadata.emptyDirs = metadata.emptyDirs.concat(emptyDirs.trim().split('\n').map((ed) => dataLayout.toRemotePath(ed)));
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const execFiles = safe.child_process.execSync(`find ${lp} -type f -executable`, { encoding: 'utf8', maxBuffer: 1024 * 1024 * 30 });
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if (execFiles === null) throw new BoxError(BoxError.FS_ERROR, `Error finding executables: ${safe.error.message}`);
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if (execFiles.length) metadata.execFiles = metadata.execFiles.concat(execFiles.trim().split('\n').map((ef) => dataLayout.toRemotePath(ef)));
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const symlinks = safe.child_process.execSync(`find ${lp} -type l`, { encoding: 'utf8', maxBuffer: 1024 * 1024 * 30 });
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if (symlinks === null) throw new BoxError(BoxError.FS_ERROR, `Error finding symlinks: ${safe.error.message}`);
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if (symlinks.length) metadata.symlinks = metadata.symlinks.concat(symlinks.trim().split('\n').map((sl) => {
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const target = safe.fs.readlinkSync(sl);
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return { path: dataLayout.toRemotePath(sl), target };
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}));
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}
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if (!safe.fs.writeFileSync(metadataFile, JSON.stringify(metadata, null, 4))) throw new BoxError(BoxError.FS_ERROR, `Error writing fs metadata: ${safe.error.message}`);
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}
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async function restoreFsMetadata(dataLayout, metadataFile) {
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof metadataFile, 'string');
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debug(`Recreating empty directories in ${dataLayout.toString()}`);
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const metadataJson = safe.fs.readFileSync(metadataFile, 'utf8');
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if (metadataJson === null) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Error loading fsmetadata.json:' + safe.error.message);
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const metadata = safe.JSON.parse(metadataJson);
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if (metadata === null) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Error parsing fsmetadata.json:' + safe.error.message);
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for (const emptyDir of metadata.emptyDirs) {
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const [mkdirError] = await safe(fs.promises.mkdir(dataLayout.toLocalPath(emptyDir), { recursive: true }));
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if (mkdirError) throw new BoxError(BoxError.FS_ERROR, `unable to create path: ${mkdirError.message}`);
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}
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for (const execFile of metadata.execFiles) {
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const [chmodError] = await safe(fs.promises.chmod(dataLayout.toLocalPath(execFile), parseInt('0755', 8)));
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if (chmodError) throw new BoxError(BoxError.FS_ERROR, `unable to chmod: ${chmodError.message}`);
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}
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for (const symlink of (metadata.symlinks || [])) {
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if (!symlink.target) continue;
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// the path may not exist if we had a directory full of symlinks
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const [mkdirError] = await safe(fs.promises.mkdir(path.dirname(dataLayout.toLocalPath(symlink.path)), { recursive: true }));
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if (mkdirError) throw new BoxError(BoxError.FS_ERROR, `unable to symlink (mkdir): ${mkdirError.message}`);
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const [symlinkError] = await safe(fs.promises.symlink(symlink.target, dataLayout.toLocalPath(symlink.path), 'file'));
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if (symlinkError) throw new BoxError(BoxError.FS_ERROR, `unable to symlink: ${symlinkError.message}`);
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}
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}
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function downloadDir(backupConfig, backupFilePath, dataLayout, progressCallback, callback) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof backupFilePath, 'string');
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof progressCallback, 'function');
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assert.strictEqual(typeof callback, 'function');
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debug(`downloadDir: ${backupFilePath} to ${dataLayout.toString()}`);
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function downloadFile(entry, done) {
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let relativePath = path.relative(backupFilePath, entry.fullPath);
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if (backupConfig.encryption) {
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const { error, result } = hush.decryptFilePath(relativePath, backupConfig.encryption);
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if (error) return done(new BoxError(BoxError.CRYPTO_ERROR, 'Unable to decrypt file'));
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relativePath = result;
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}
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const destFilePath = dataLayout.toLocalPath('./' + relativePath);
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fs.mkdir(path.dirname(destFilePath), { recursive: true }, function (error) {
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if (error) return done(new BoxError(BoxError.FS_ERROR, error.message));
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async.retry({ times: 5, interval: 20000 }, function (retryCallback) {
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storage.api(backupConfig.provider).download(backupConfig, entry.fullPath, function (error, sourceStream) {
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if (error) {
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progressCallback({ message: `Download ${entry.fullPath} to ${destFilePath} errored: ${error.message}` });
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return retryCallback(error);
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}
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let destStream = hush.createWriteStream(destFilePath, backupConfig.encryption);
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// protect against multiple errors. must destroy the write stream so that a previous retry does not write
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let closeAndRetry = once((error) => {
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if (error) progressCallback({ message: `Download ${entry.fullPath} to ${destFilePath} errored: ${error.message}` });
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else progressCallback({ message: `Download ${entry.fullPath} to ${destFilePath} finished` });
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sourceStream.destroy();
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destStream.destroy();
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retryCallback(error);
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});
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destStream.on('progress', function (progress) {
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const transferred = Math.round(progress.transferred/1024/1024), speed = Math.round(progress.speed/1024/1024);
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if (!transferred && !speed) return progressCallback({ message: `Downloading ${entry.fullPath}` }); // 0M@0MBps looks wrong
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progressCallback({ message: `Downloading ${entry.fullPath}: ${transferred}M@${speed}MBps` });
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});
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destStream.on('error', closeAndRetry);
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sourceStream.on('error', closeAndRetry);
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progressCallback({ message: `Downloading ${entry.fullPath} to ${destFilePath}` });
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sourceStream.pipe(destStream, { end: true }).on('done', closeAndRetry);
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});
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}, done);
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});
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}
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storage.api(backupConfig.provider).listDir(backupConfig, backupFilePath, 1000, function (entries, iteratorDone) {
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// https://www.digitalocean.com/community/questions/rate-limiting-on-spaces?answer=40441
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const concurrency = backupConfig.downloadConcurrency || (backupConfig.provider === 's3' ? 30 : 10);
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async.eachLimit(entries, concurrency, downloadFile, iteratorDone);
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}, callback);
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}
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function download(backupConfig, remotePath, dataLayout, progressCallback, callback) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof remotePath, 'string');
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof progressCallback, 'function');
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assert.strictEqual(typeof callback, 'function');
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debug(`download: Downloading ${remotePath} to ${dataLayout.toString()}`);
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const backupFilePath = getBackupFilePath(backupConfig, remotePath);
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downloadDir(backupConfig, backupFilePath, dataLayout, progressCallback, async function (error) {
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if (error) return callback(error);
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[error] = await safe(restoreFsMetadata(dataLayout, `${dataLayout.localRoot()}/fsmetadata.json`));
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callback(error);
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});
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}
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function upload(backupConfig, remotePath, dataLayout, progressCallback, callback) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof remotePath, 'string');
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assert.strictEqual(typeof dataLayout, 'object');
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assert.strictEqual(typeof progressCallback, 'function');
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assert.strictEqual(typeof callback, 'function');
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async.series([
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saveFsMetadata.bind(null, dataLayout, `${dataLayout.localRoot()}/fsmetadata.json`),
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sync.bind(null, backupConfig, remotePath, dataLayout, progressCallback)
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], callback);
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}
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@@ -0,0 +1,193 @@
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'use strict';
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exports = module.exports = {
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getBackupFilePath,
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download,
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upload
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};
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const assert = require('assert'),
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async = require('async'),
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BoxError = require('../boxerror.js'),
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DataLayout = require('../datalayout.js'),
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debug = require('debug')('box:backupformat/tgz'),
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{ DecryptStream, EncryptStream } = require('../hush.js'),
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once = require('../once.js'),
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path = require('path'),
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progressStream = require('progress-stream'),
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storage = require('../storage.js'),
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tar = require('tar-fs'),
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zlib = require('zlib');
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function getBackupFilePath(backupConfig, remotePath) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof remotePath, 'string');
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const rootPath = storage.api(backupConfig.provider).getRootPath(backupConfig);
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const fileType = backupConfig.encryption ? '.tar.gz.enc' : '.tar.gz';
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return path.join(rootPath, remotePath + fileType);
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}
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function tarPack(dataLayout, encryption, callback) {
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof encryption, 'object');
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assert.strictEqual(typeof callback, 'function');
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const pack = tar.pack('/', {
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dereference: false, // pack the symlink and not what it points to
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entries: dataLayout.localPaths(),
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ignoreStatError: (path, err) => {
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debug(`tarPack: error stat'ing ${path} - ${err.code}`);
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return err.code === 'ENOENT'; // ignore if file or dir got removed (probably some temporary file)
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},
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map: function(header) {
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header.name = dataLayout.toRemotePath(header.name);
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// the tar pax format allows us to encode filenames > 100 and size > 8GB (see #640)
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// https://www.systutorials.com/docs/linux/man/5-star/
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if (header.size > 8589934590 || header.name > 99) header.pax = { size: header.size };
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return header;
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},
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strict: false // do not error for unknown types (skip fifo, char/block devices)
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});
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const gzip = zlib.createGzip({});
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const ps = progressStream({ time: 10000 }); // emit 'progress' every 10 seconds
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pack.on('error', function (error) {
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debug('tarPack: tar stream error.', error);
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ps.emit('error', new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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});
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gzip.on('error', function (error) {
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debug('tarPack: gzip stream error.', error);
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ps.emit('error', new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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});
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if (encryption) {
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const encryptStream = new EncryptStream(encryption);
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encryptStream.on('error', function (error) {
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debug('tarPack: encrypt stream error.', error);
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ps.emit('error', new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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});
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pack.pipe(gzip).pipe(encryptStream).pipe(ps);
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} else {
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pack.pipe(gzip).pipe(ps);
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}
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return callback(null, ps);
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}
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function tarExtract(inStream, dataLayout, encryption, callback) {
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assert.strictEqual(typeof inStream, 'object');
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof encryption, 'object');
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assert.strictEqual(typeof callback, 'function');
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const gunzip = zlib.createGunzip({});
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const ps = progressStream({ time: 10000 }); // display a progress every 10 seconds
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const extract = tar.extract('/', {
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map: function (header) {
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header.name = dataLayout.toLocalPath(header.name);
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return header;
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},
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dmode: 500 // ensure directory is writable
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});
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const emitError = once((error) => {
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inStream.destroy();
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ps.emit('error', error);
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});
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inStream.on('error', function (error) {
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debug('tarExtract: input stream error.', error);
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emitError(new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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});
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gunzip.on('error', function (error) {
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debug('tarExtract: gunzip stream error.', error);
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emitError(new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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});
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extract.on('error', function (error) {
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debug('tarExtract: extract stream error.', error);
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emitError(new BoxError(BoxError.EXTERNAL_ERROR, error.message));
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});
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extract.on('finish', function () {
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debug('tarExtract: done.');
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// we use a separate event because ps is a through2 stream which emits 'finish' event indicating end of inStream and not extract
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ps.emit('done');
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});
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if (encryption) {
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let decrypt = new DecryptStream(encryption);
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decrypt.on('error', function (error) {
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debug('tarExtract: decrypt stream error.', error);
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emitError(new BoxError(BoxError.EXTERNAL_ERROR, `Failed to decrypt: ${error.message}`));
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});
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inStream.pipe(ps).pipe(decrypt).pipe(gunzip).pipe(extract);
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} else {
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inStream.pipe(ps).pipe(gunzip).pipe(extract);
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}
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callback(null, ps);
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}
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function download(backupConfig, remotePath, dataLayout, progressCallback, callback) {
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assert.strictEqual(typeof backupConfig, 'object');
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assert.strictEqual(typeof remotePath, 'string');
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assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
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assert.strictEqual(typeof progressCallback, 'function');
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assert.strictEqual(typeof callback, 'function');
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debug(`download: Downloading ${remotePath} to ${dataLayout.toString()}`);
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const backupFilePath = getBackupFilePath(backupConfig, remotePath);
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async.retry({ times: 5, interval: 20000 }, function (retryCallback) {
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progressCallback({ message: `Downloading backup ${remotePath}` });
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storage.api(backupConfig.provider).download(backupConfig, backupFilePath, function (error, sourceStream) {
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if (error) return retryCallback(error);
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tarExtract(sourceStream, dataLayout, backupConfig.encryption, function (error, ps) {
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if (error) return retryCallback(error);
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ps.on('progress', function (progress) {
|
||||
const transferred = Math.round(progress.transferred/1024/1024), speed = Math.round(progress.speed/1024/1024);
|
||||
if (!transferred && !speed) return progressCallback({ message: 'Downloading backup' }); // 0M@0MBps looks wrong
|
||||
progressCallback({ message: `Downloading ${transferred}M@${speed}MBps` });
|
||||
});
|
||||
ps.on('error', retryCallback);
|
||||
ps.on('done', retryCallback);
|
||||
});
|
||||
});
|
||||
}, callback);
|
||||
}
|
||||
|
||||
function upload(backupConfig, remotePath, dataLayout, progressCallback, callback) {
|
||||
assert.strictEqual(typeof backupConfig, 'object');
|
||||
assert.strictEqual(typeof remotePath, 'string');
|
||||
assert.strictEqual(typeof dataLayout, 'object');
|
||||
assert.strictEqual(typeof progressCallback, 'function');
|
||||
assert.strictEqual(typeof callback, 'function');
|
||||
|
||||
async.retry({ times: 5, interval: 20000 }, function (retryCallback) {
|
||||
retryCallback = once(retryCallback); // protect again upload() erroring much later after tar stream error
|
||||
|
||||
tarPack(dataLayout, backupConfig.encryption, function (error, tarStream) {
|
||||
if (error) return retryCallback(error);
|
||||
|
||||
tarStream.on('progress', function (progress) {
|
||||
const transferred = Math.round(progress.transferred/1024/1024), speed = Math.round(progress.speed/1024/1024);
|
||||
if (!transferred && !speed) return progressCallback({ message: 'Uploading backup' }); // 0M@0MBps looks wrong
|
||||
progressCallback({ message: `Uploading backup ${transferred}M@${speed}MBps` });
|
||||
});
|
||||
tarStream.on('error', retryCallback); // already returns BoxError
|
||||
|
||||
storage.api(backupConfig.provider).upload(backupConfig, getBackupFilePath(backupConfig, remotePath), tarStream, retryCallback);
|
||||
});
|
||||
}, callback);
|
||||
}
|
||||
Reference in New Issue
Block a user