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/*
* Copyright 2016 kay schluehr.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jupyterkernel.kernel;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.json.JSONObject;
import java.security.InvalidKeyException;
import java.io.UnsupportedEncodingException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.zeromq.ZContext;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Socket;
import org.zeromq.ZMQException;
import org.zeromq.ZMsg;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.PosixParser;
import org.apache.commons.cli.CommandLineParser;
/**
*
* @author kay schluehr
*/
public class Session extends Thread {
public static boolean _DEBUG_ = false;
private class SocketType {
public static final int CONTROL = 0;
public static final int DELIM = 1;
public static final int HMAC = 2;
public static final int HEADER = 3;
public static final int PARENT = 4;
public static final int METADATA = 5;
public static final int CONTENT = 6;
public static final int BLOB = 7;
}
// battery of sockets
Socket Control;
Socket Heartbeat;
Socket IOPub;
Socket Shell;
Socket Stdin;
ZContext ctx;
ZMQ.Poller sockets;
// HMAC key
// NOTE: this doesn't even pretend to be secure, but then the connection
// file which is transmitted in plaintext isn't either.
byte[] key = null;
// JSONObject which stores data from Jupyter connection file
JSONObject connectionData;
// Used kernel
Kernel kernel;
boolean restart_kernel_requested = false;
public Session()
{
}
void closeSockets() {
try {
if (Shell != null) {
Shell.close();
}
if (Control != null) {
Control.close();
}
if (IOPub != null) {
IOPub.close();
}
if (Stdin != null) {
Stdin.close();
}
if (Heartbeat != null) {
Heartbeat.close();
}
ctx.close();
} catch (Exception e) {
}
}
private byte[] getKey() throws
InvalidKeyException,
UnsupportedEncodingException {
if (key == null) {
String sKey = (String) connectionData.get("key");
/*
if(sKey.length()!=32)
{
throw new InvalidKeyException(sKey);
}
*/
key = sKey.getBytes();
return key;
}
return key;
}
boolean createSockets() {
ctx = new ZContext();
String ip = (String) connectionData.get("ip");
String transport = (String) connectionData.get("transport");
try {
// http://jupyter-client.readthedocs.org/en/latest/messaging.html#heartbeat-for-kernels
//
// Clients send ping messages on a REQ socket, which are echoed right back from the Kernel’s
// REP socket. These are simple bytestrings, not full JSON messages described above.
Heartbeat = ctx.createSocket(ZMQ.REP);
Heartbeat.bind(String.format("%s://%s:%s",
transport, ip, connectionData.get("hb_port")
));
// http://jupyter-client.readthedocs.org/en/latest/messaging.html#introduction
// Shell: this single ROUTER socket allows multiple incoming connections from frontends, and
// this is the socket where requests for code execution, object information, prompts, etc.
// are made to the kernel by any frontend.
String shellAddress = String.format("%s://%s:%s",
transport, ip, connectionData.get("shell_port"));
Shell = ctx.createSocket(ZMQ.ROUTER);
Shell.bind(shellAddress);
// Control: This channel is identical to Shell, but operates on a separate socket, to allow
// important messages to avoid queueing behind execution requests (e.g. shutdown or abort).
Control = ctx.createSocket(ZMQ.ROUTER);
Control.bind(String.format("%s://%s:%s",
transport, ip, connectionData.get("control_port")
));
// IOPub: this socket is the ‘broadcast channel’ where the kernel publishes all side effects
// (stdout, stderr, etc.) as well as the requests coming from any client over the shell socket
// send its own requests on the stdin socket.
IOPub = ctx.createSocket(ZMQ.PUB);
IOPub.bind(String.format("%s://%s:%s",
transport, ip, connectionData.get("iopub_port")
));
Stdin = ctx.createSocket(ZMQ.ROUTER);
Stdin.connect(String.format("%s://%s:%s",
transport, ip, connectionData.get("stdin_port")
));
} catch (ZMQException e) {
closeSockets();
Logger.getLogger(Session.class.getName()).log(Level.SEVERE, null, e);
}
sockets = ctx.createPoller(4);
sockets.register(Control, ZMQ.Poller.POLLIN);
sockets.register(Heartbeat, ZMQ.Poller.POLLIN);
sockets.register(Shell, ZMQ.Poller.POLLIN);
sockets.register(Stdin, ZMQ.Poller.POLLIN);
return true;
}
public static JSONObject readConnectionFile(String connectionFilePath) throws
FileNotFoundException,
IOException {
if (Session._DEBUG_) {
System.out.println("ConnectionFilePath: " + connectionFilePath);
}
File connectionFile = new File(connectionFilePath);
FileInputStream fis = new FileInputStream(connectionFile);
byte[] content = new byte[(int) connectionFile.length()];
try {
fis.read(content);
} finally {
fis.close();
}
// parse connection file content into JSON object
return new JSONObject(new String(content, "UTF-8"));
}
public void setKernel(String kernelName)
{
this.kernel = new Kernel(kernelName);
}
public void setConnectionData(JSONObject connectionData) throws
InvalidKeyException,
UnsupportedEncodingException
{
this.connectionData = connectionData;
getKey();
}
@Override
public void run() {
MessageObject msg;
if (!createSockets()) {
return;
}
try {
kernel.setStdinTemplate(new MessageObject(null, Stdin, key));
kernel.setIOPubTemplate(new MessageObject(null, IOPub, key));
kernel.setConnectionData(connectionData);
System.out.println(
String.format("[jupyter-kernel.jar] %s kernel started.",
kernel.getKernel())
);
while (!this.isInterrupted()) {
byte[] message;
sockets.poll();
if (sockets.pollin(0)) {
msg = new MessageObject(ZMsg.recvMsg(Control), Control, key);
kernel.dispatch(msg);
}
if (sockets.pollin(1)) {
message = Heartbeat.recv(0);
Heartbeat.send(message);
}
if (sockets.pollin(2)) {
msg = new MessageObject(ZMsg.recvMsg(Shell), Shell, key);
kernel.dispatch(msg);
}
if (sockets.pollin(3)) {
msg = new MessageObject(ZMsg.recvMsg(Stdin), Stdin, key);
kernel.dispatch(msg);
}
if (kernel.isShutdownRequested()) {
restart_kernel_requested = kernel.isRestartRequested();
break;
}
}
} finally {
closeSockets();
}
}
public static void runKernel(Session session, String[] args) throws
FileNotFoundException,
InvalidKeyException,
UnsupportedEncodingException,
IOException {
if (args.length > 0) {
String connectionFilePath;
String kernelName;
Options options = new Options();
options.addOption("f", true, "connection file path");
options.addOption("k", true, "kernel name");
CommandLineParser parser = new PosixParser();
try {
CommandLine cmd = parser.parse(options, args);
connectionFilePath = cmd.getOptionValue("f");
kernelName = cmd.getOptionValue("k");
} catch (ParseException e) {
e.printStackTrace(System.out);
return;
}
JSONObject connectionData = readConnectionFile(connectionFilePath);
if (Session._DEBUG_) {
System.out.println(
"Connection File\n------------------------------------");
System.out.println(connectionData.toString(4));
}
session.setKernel(kernelName);
session.setConnectionData(connectionData);
try {
session.start();
session.join();
} catch (InterruptedException e1) {
}
}
}
public static void runKernelDebug(Session session) throws FileNotFoundException,
InvalidKeyException,
UnsupportedEncodingException,
IOException {
Session._DEBUG_ = true;
ZContext ctx = new ZContext();
Socket channel = ctx.createSocket(ZMQ.REP);
channel.bind("tcp://127.0.0.1:2222");
byte[] msg = channel.recv();
String sArgs = new String(msg, StandardCharsets.UTF_8);
String[] newArgs = sArgs.split(" ");
channel.send("ok");
runKernel(session, newArgs);
}
public static void main(String[] args) throws FileNotFoundException,
InvalidKeyException,
UnsupportedEncodingException,
IOException {
Session session = new Session();
if (args==null || args.length == 0) {
// Used for debugging the kernel.
// Start this application in your IDE first.
runKernelDebug(session);
} else {
if (Session._DEBUG_) {
System.out.println("BEGIN ARGS");
for (String arg : args) {
System.out.println(" " + arg);
}
System.out.println("END ARGS");
}
runKernel(session, args);
}
}
}