| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE |
| * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.flink.python.api.streaming.plan; |
| |
| import org.apache.flink.configuration.ConfigConstants; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.python.api.PythonOptions; |
| import org.apache.flink.python.api.streaming.util.StreamPrinter; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.net.ServerSocket; |
| import java.net.Socket; |
| import java.net.SocketTimeoutException; |
| |
| import static org.apache.flink.python.api.PythonPlanBinder.FLINK_PYTHON_PLAN_NAME; |
| |
| /** |
| * Generic class to exchange data during the plan phase. |
| */ |
| public class PythonPlanStreamer { |
| |
| protected static final Logger LOG = LoggerFactory.getLogger(PythonPlanStreamer.class); |
| private final Configuration config; |
| |
| protected PythonPlanSender sender; |
| protected PythonPlanReceiver receiver; |
| |
| private Process process; |
| private ServerSocket server; |
| private Socket socket; |
| |
| public PythonPlanStreamer(Configuration config) { |
| this.config = config; |
| } |
| |
| public Object getRecord() throws IOException { |
| return getRecord(false); |
| } |
| |
| public Object getRecord(boolean normalize) throws IOException { |
| return receiver.getRecord(normalize); |
| } |
| |
| public void sendRecord(Object record) throws IOException { |
| sender.sendRecord(record); |
| } |
| |
| public void open(String tmpPath, String args) throws IOException { |
| startPython(tmpPath, args); |
| } |
| |
| private void startPython(String tmpPath, String args) throws IOException { |
| String pythonBinaryPath = config.getString(PythonOptions.PYTHON_BINARY_PATH); |
| |
| try { |
| Runtime.getRuntime().exec(pythonBinaryPath); |
| } catch (IOException ignored) { |
| throw new RuntimeException(pythonBinaryPath + " does not point to a valid python binary."); |
| } |
| process = Runtime.getRuntime().exec(pythonBinaryPath + " -B " + tmpPath + FLINK_PYTHON_PLAN_NAME + args); |
| |
| new Thread(new StreamPrinter(process.getInputStream())).start(); |
| new Thread(new StreamPrinter(process.getErrorStream())).start(); |
| |
| server = new ServerSocket(0); |
| server.setSoTimeout(50); |
| |
| process.getOutputStream().write("plan\n".getBytes(ConfigConstants.DEFAULT_CHARSET)); |
| process.getOutputStream().flush(); |
| } |
| |
| public boolean preparePlanMode() throws IOException { |
| try { |
| process.getOutputStream().write((server.getLocalPort() + "\n").getBytes(ConfigConstants.DEFAULT_CHARSET)); |
| process.getOutputStream().flush(); |
| } catch (IOException ignored) { |
| // the python process most likely shutdown in the meantime |
| return false; |
| } |
| while (true) { |
| try { |
| socket = server.accept(); |
| sender = new PythonPlanSender(socket.getOutputStream()); |
| receiver = new PythonPlanReceiver(socket.getInputStream()); |
| return true; |
| } catch (SocketTimeoutException ignored) { |
| switch(checkPythonProcessHealth()) { |
| case RUNNING: |
| continue; |
| case STOPPED: |
| return false; |
| case FAILED: |
| throw new RuntimeException("Plan file caused an error. Check log-files for details."); |
| } |
| } |
| } |
| } |
| |
| public void finishPlanMode() { |
| try { |
| socket.close(); |
| } catch (IOException e) { |
| LOG.error("Failed to close socket.", e); |
| } |
| } |
| |
| public void close() { |
| try { |
| process.exitValue(); |
| } catch (NullPointerException ignored) { //exception occurred before process was started |
| } catch (IllegalThreadStateException ignored) { //process still active |
| process.destroy(); |
| } finally { |
| try { |
| server.close(); |
| } catch (IOException e) { |
| LOG.error("Failed to close socket.", e); |
| } |
| } |
| } |
| |
| private ProcessState checkPythonProcessHealth() { |
| try { |
| int value = process.exitValue(); |
| if (value != 0) { |
| return ProcessState.FAILED; |
| } else { |
| return ProcessState.STOPPED; |
| } |
| } catch (IllegalThreadStateException ignored) {//Process still running |
| return ProcessState.RUNNING; |
| } |
| } |
| |
| private enum ProcessState { |
| RUNNING, |
| FAILED, |
| STOPPED |
| } |
| } |