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mergeInto(LibraryManager.library, {
$IDBFS__deps: ['$FS', '$MEMFS', '$PATH'],
$IDBFS: {
dbs: {},
indexedDB: function() {
return window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
},
DB_VERSION: 20,
DB_STORE_NAME: 'FILE_DATA',
// reuse all of the core MEMFS functionality
mount: function(mount) {
return MEMFS.mount.apply(null, arguments);
},
// the only custom function IDBFS implements is to handle
// synchronizing the wrapped MEMFS with a backing IDB instance
syncfs: function(mount, populate, callback) {
IDBFS.getLocalSet(mount, function(err, local) {
if (err) return callback(err);
IDBFS.getRemoteSet(mount, function(err, remote) {
if (err) return callback(err);
var src = populate ? remote : local;
var dst = populate ? local : remote;
IDBFS.reconcile(src, dst, callback);
});
});
},
reconcile: function(src, dst, callback) {
var total = 0;
var create = {};
for (var key in src.files) {
if (!src.files.hasOwnProperty(key)) continue;
var e = src.files[key];
var e2 = dst.files[key];
if (!e2 || e.timestamp > e2.timestamp) {
create[key] = e;
total++;
}
}
var remove = {};
for (var key in dst.files) {
if (!dst.files.hasOwnProperty(key)) continue;
var e = dst.files[key];
var e2 = src.files[key];
if (!e2) {
remove[key] = e;
total++;
}
}
if (!total) {
// early out
return callback(null);
}
var completed = 0;
var done = function(err) {
if (err) return callback(err);
if (++completed >= total) {
return callback(null);
}
};
// create a single transaction to handle and IDB reads / writes we'll need to do
var db = src.type === 'remote' ? src.db : dst.db;
var transaction = db.transaction([IDBFS.DB_STORE_NAME], 'readwrite');
transaction.onerror = function() { callback(this.error); };
var store = transaction.objectStore(IDBFS.DB_STORE_NAME);
for (var path in create) {
if (!create.hasOwnProperty(path)) continue;
var entry = create[path];
if (dst.type === 'local') {
// save file to local
try {
if (FS.isDir(entry.mode)) {
FS.mkdir(path, entry.mode);
} else if (FS.isFile(entry.mode)) {
var stream = FS.open(path, 'w+', 0666);
FS.write(stream, entry.contents, 0, entry.contents.length, 0, true /* canOwn */);
FS.close(stream);
}
done(null);
} catch (e) {
return done(e);
}
} else {
// save file to IDB
var req = store.put(entry, path);
req.onsuccess = function() { done(null); };
req.onerror = function() { done(this.error); };
}
}
for (var path in remove) {
if (!remove.hasOwnProperty(path)) continue;
var entry = remove[path];
if (dst.type === 'local') {
// delete file from local
try {
if (FS.isDir(entry.mode)) {
// TODO recursive delete?
FS.rmdir(path);
} else if (FS.isFile(entry.mode)) {
FS.unlink(path);
}
done(null);
} catch (e) {
return done(e);
}
} else {
// delete file from IDB
var req = store.delete(path);
req.onsuccess = function() { done(null); };
req.onerror = function() { done(this.error); };
}
}
},
getLocalSet: function(mount, callback) {
var files = {};
var isRealDir = function(p) {
return p !== '.' && p !== '..';
};
var toAbsolute = function(root) {
return function(p) {
return PATH.join(root, p);
}
};
var check = FS.readdir(mount.mountpoint)
.filter(isRealDir)
.map(toAbsolute(mount.mountpoint));
while (check.length) {
var path = check.pop();
var stat, node;
try {
var lookup = FS.lookupPath(path);
node = lookup.node;
stat = FS.stat(path);
} catch (e) {
return callback(e);
}
if (FS.isDir(stat.mode)) {
check.push.apply(check, FS.readdir(path)
.filter(isRealDir)
.map(toAbsolute(path)));
files[path] = { mode: stat.mode, timestamp: stat.mtime };
} else if (FS.isFile(stat.mode)) {
files[path] = { contents: node.contents, mode: stat.mode, timestamp: stat.mtime };
} else {
return callback(new Error('node type not supported'));
}
}
return callback(null, { type: 'local', files: files });
},
getDB: function(name, callback) {
// look it up in the cache
var db = IDBFS.dbs[name];
if (db) {
return callback(null, db);
}
var req;
try {
req = IDBFS.indexedDB().open(name, IDBFS.DB_VERSION);
} catch (e) {
return onerror(e);
}
req.onupgradeneeded = function() {
db = req.result;
db.createObjectStore(IDBFS.DB_STORE_NAME);
};
req.onsuccess = function() {
db = req.result;
// add to the cache
IDBFS.dbs[name] = db;
callback(null, db);
};
req.onerror = function() {
callback(this.error);
};
},
getRemoteSet: function(mount, callback) {
var files = {};
IDBFS.getDB(mount.mountpoint, function(err, db) {
if (err) return callback(err);
var transaction = db.transaction([IDBFS.DB_STORE_NAME], 'readonly');
transaction.onerror = function() { callback(this.error); };
var store = transaction.objectStore(IDBFS.DB_STORE_NAME);
store.openCursor().onsuccess = function(event) {
var cursor = event.target.result;
if (!cursor) {
return callback(null, { type: 'remote', db: db, files: files });
}
files[cursor.key] = cursor.value;
cursor.continue();
};
});
}
}
});
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