ndn-js
Version:
A JavaScript client library for Named Data Networking
77 lines (69 loc) • 2.58 kB
JavaScript
/**
* Encapsulate a Buffer and support dynamic reallocation.
* Copyright (C) 2015-2019 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* A copy of the GNU Lesser General Public License is in the file COPYING.
*/
/** @ignore */
var printStackTrace = require('../../contrib/stacktrace/stacktrace.js').printStackTrace;
/**
* NdnCommon has static NDN utility methods and constants.
* @constructor
*/
var NdnCommon = {};
exports.NdnCommon = NdnCommon;
/**
* The practical limit of the size of a network-layer packet. If a packet is
* larger than this, the library or application MAY drop it. This constant is
* defined in this low-level class so that internal code can use it, but
* applications should use the static API method
* Face.getMaxNdnPacketSize() which is equivalent.
*/
NdnCommon.MAX_NDN_PACKET_SIZE = 8800;
/**
* Get the error message plus its stack trace.
* @param {Error} error The error object.
* @return {string} The error message, plus the stack trace with each line
* separated by '\n'.
*/
NdnCommon.getErrorWithStackTrace = function(error)
{
return error + '\n' + printStackTrace({e: error}).join('\n');
};
/**
* Check for Indexed DB support and call onComplete with the result as described
* below. This has to use an onComplete callback since IndexedDB is async.
* @param {function} onComplete This calls onComplete(haveIndexedDb) where
* haveIndexedDb is true if the browser has Indexed DB support, otherwise false.
*/
NdnCommon.checkIndexedDb = function(onComplete)
{
try {
var database = new Dexie("test-Dexie-support");
database.version(1).stores({});
database.open();
// Give Dexie a little time to open.
setTimeout(function() {
try {
onComplete(database.isOpen());
} catch (ex) {
onComplete(false);
}
}, 200);
} catch (ex) {
onComplete(false);
}
};