ndn-js
Version:
A JavaScript client library for Named Data Networking
329 lines (305 loc) • 18.7 kB
JavaScript
/*
* Copyright (C) 2015-2019 Regents of the University of California.
*
* 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.
*/
/*
* This script shows an example of the repo-ng basic insertion protocol,
* described here:
* http://redmine.named-data.net/projects/repo-ng/wiki/Basic_Repo_Insertion_Protocol
* See main() for more details.
*/
var ProtoBuf = require("protobufjs");
var Face = require('../../..').Face;
var Name = require('../../..').Name;
var Interest = require('../../..').Interest;
var Data = require('../../..').Data;
var Blob = require('../../..').Blob;
var UnixTransport = require('../../..').UnixTransport;
var ProtobufTlv = require('../../..').ProtobufTlv;
var KeyType = require('../../..').KeyType;
var MemoryIdentityStorage = require('../../..').MemoryIdentityStorage;
var MemoryPrivateKeyStorage = require('../../..').MemoryPrivateKeyStorage;
var IdentityManager = require('../../..').IdentityManager;
var SelfVerifyPolicyManager = require('../../..').SelfVerifyPolicyManager;
var KeyChain = require('../../..').KeyChain;
var DEFAULT_RSA_PUBLIC_KEY_DER = new Buffer([
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0x41, 0x02, 0x03, 0x01, 0x00, 0x01
]);
var DEFAULT_RSA_PRIVATE_KEY_DER = new Buffer([
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]);
/**
* Send a command interest for the repo to fetch the given fetchName and insert
* it in the repo.
* @param {Face} face The Face used to call makeCommandInterest and expressInterest.
* @param {Name} repoCommandPrefix The repo command prefix.
* @param {Name} fetchName The name to fetch. If startBlockId and endBlockId are
* supplied, then the repo will request multiple segments by appending the range
* of block IDs (segment numbers).
* @param {function} onInsertStarted When the request insert command
* successfully returns, this calls onInsertStarted().
* @param {function} onFailed If the command fails for any reason, this prints
* an error and calls onFailed().
* @param {number} startBlockId (optional) The starting block ID (segment
* number) to fetch.
* @param {number} endBlockId (optional) The end block ID (segment number) to fetch.
*/
function requestInsert
(face, repoCommandPrefix, fetchName, onInsertStarted, onFailed, startBlockId,
endBlockId)
{
var builder = ProtoBuf.loadProtoFile
("../../browser/repo-ng/repo-command-parameter.proto");
var descriptor = builder.lookup("ndn_message.RepoCommandParameterMessage");
var RepoCommandParameterMessage = descriptor.build();
var parameter = new RepoCommandParameterMessage();
parameter.repo_command_parameter =
new RepoCommandParameterMessage.RepoCommandParameter();
// Add the Name.
parameter.repo_command_parameter.name = new RepoCommandParameterMessage.Name();
for (var i = 0; i < fetchName.size(); ++i)
parameter.repo_command_parameter.name.add
("component", fetchName.get(i).getValue().buf());
// Add startBlockId and endBlockId if supplied.
if (startBlockId != null)
parameter.repo_command_parameter.start_block_id = startBlockId;
if (endBlockId != null)
parameter.repo_command_parameter.end_block_id = endBlockId;
// Create the command interest.
var interest = new Interest(new Name(repoCommandPrefix).append("insert")
.append(new Name.Component(ProtobufTlv.encode(parameter, descriptor))));
face.makeCommandInterest(interest);
// Send the command interest and get the response or timeout.
face.expressInterest
(interest,
function(localInterest, data) {
var builder = ProtoBuf.loadProtoFile
("../../browser/repo-ng/repo-command-response.proto");
var descriptor = builder.lookup("ndn_message.RepoCommandResponseMessage");
var RepoCommandResponseMessage = descriptor.build();
var response = new RepoCommandResponseMessage();
try {
ProtobufTlv.decode(response, descriptor, data.getContent());
} catch (ex) {
console.log("Cannot decode the repo command response " + ex);
onFailed();
}
if (response.repo_command_response.status_code == 100)
onInsertStarted();
else {
console.log
("Got repo command error code " +
response.repo_command_response.status_code);
onFailed();
}
},
function(localInterest) {
console.log("Insert repo command timeout");
onFailed();
});
}
/**
* This is an example class to supply the data requested by the repo-ng
* insertion process. For you application, you would supply data in a different
* way. This sends data packets until it has sent (endBlockId - startBlockId) + 1
* packets. It might be simpler to finish when onInterest has sent the packet
* for segment endBlockId, but there is no guarantee that the interests will
* arrive in order. Therefore we send packets until the total is sent.
* @param {KeyChain} keyChain This calls keyChain.sign.
* @param {Name} certificateName The certificateName for keyChain.sign.
* @param {number} startBlockId The startBlockId given to requestInsert().
* @param {number} endBlockId The endBlockId given to requestInsert().
* @param {function} onFinished When the final segment has been sent, this calls
* onFinished().
*/
var ProduceSegments = function ProduceSegments
(keyChain, certificateName, startBlockId, endBlockId, onFinished)
{
this.keyChain = keyChain;
this.certificateName = certificateName;
this.startBlockId = startBlockId;
this.endBlockId = endBlockId;
this.nSegmentsSent = 0;
this.onFinished = onFinished;
};
ProduceSegments.prototype.onInterest = function
(prefix, interest, face, interestFilterId, filter)
{
console.log("Got interest " + interest.toUri());
// Make and sign a Data packet with the interest name.
var data = new Data(interest.name);
var content = "Data packet " + interest.name.toUri();
data.setContent(new Blob(content));
this.keyChain.sign(data, this.certificateName);
face.putData(data);
console.log("Sent data packet " + data.getName().toUri());
this.nSegmentsSent += 1;
if (this.nSegmentsSent >= (this.endBlockId - this.startBlockId) + 1)
// We sent the final segment.
this.onFinished();
};
/**
* Call requestInsert and register a prefix so that ProduceSegments will answer
* interests from the repo to send the data packets. This assumes that repo-ng
* is already running (e.g. `sudo ndn-repo-ng`).
*/
function main()
{
var repoCommandPrefix = new Name("/example/repo/1");
var repoDataPrefix = new Name("/example/data/1");
var nowMilliseconds = new Date().getTime();
var fetchPrefix = new Name(repoDataPrefix).append("testinsert").appendVersion
(nowMilliseconds);
// Connect to the local forwarder with a Unix socket.
var face = new Face(new UnixTransport());
// For now, when setting face.setCommandSigningInfo, use a key chain with
// a default private key instead of the system default key chain. This
// is OK for now because NFD is configured to skip verification, so it
// ignores the system default key chain.
// On a platform which supports it, it would be better to use the default
// KeyChain constructor.
var identityStorage = new MemoryIdentityStorage();
var privateKeyStorage = new MemoryPrivateKeyStorage();
var keyChain = new KeyChain
(new IdentityManager(identityStorage, privateKeyStorage),
new SelfVerifyPolicyManager(identityStorage));
// Initialize the storage.
var keyName = new Name("/testname/DSK-123");
var certificateName = keyName.getSubName(0, keyName.size() - 1).append
("KEY").append(keyName.get(-1)).append("ID-CERT").append("0");
identityStorage.addKey(keyName, KeyType.RSA, new Blob(DEFAULT_RSA_PUBLIC_KEY_DER, false));
privateKeyStorage.setKeyPairForKeyName
(keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER);
face.setCommandSigningInfo(keyChain, certificateName);
// Register the prefix and send the repo insert command at the same time.
var startBlockId = 0;
var endBlockId = 1;
var produceSegments = new ProduceSegments
(keyChain, certificateName, startBlockId, endBlockId,
function() {
console.log("All data was inserted.");
// This will cause the script to quit.
face.close();
});
console.log("Register prefix " + fetchPrefix.toUri());
face.registerPrefix
(fetchPrefix, produceSegments.onInterest.bind(produceSegments),
function(prefix) {
console.log("Register failed for prefix " + prefix.toUri());
// This will cause the script to quit.
face.close();
});
requestInsert
(face, repoCommandPrefix, fetchPrefix,
function() { console.log("Insert started for " + fetchPrefix.toUri()); },
function() {
// Already printed the error. This will cause the script to quit.
face.close();
}, startBlockId, endBlockId);
}
main();