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From rhtyd <...@git.apache.org>
Subject [GitHub] cloudstack pull request: CLOUDSTACK-9299: Out-of-band Management f...
Date Tue, 10 May 2016 11:48:08 GMT
Github user rhtyd commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1502#discussion_r62656777
  
    --- Diff: utils/src/main/java/org/apache/cloudstack/utils/process/ProcessRunner.java ---
    @@ -0,0 +1,109 @@
    +//
    +// 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.cloudstack.utils.process;
    +
    +import com.cloud.utils.concurrency.NamedThreadFactory;
    +import com.google.common.base.Preconditions;
    +import com.google.common.base.Strings;
    +import org.apache.log4j.Logger;
    +import org.joda.time.Duration;
    +
    +import java.io.BufferedReader;
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.io.InputStreamReader;
    +import java.util.List;
    +import java.util.concurrent.Callable;
    +import java.util.concurrent.ExecutionException;
    +import java.util.concurrent.ExecutorService;
    +import java.util.concurrent.Executors;
    +import java.util.concurrent.Future;
    +import java.util.concurrent.TimeUnit;
    +import java.util.concurrent.TimeoutException;
    +
    +public class ProcessRunner {
    +    public static final Logger LOG = Logger.getLogger(ProcessRunner.class);
    +
    +    private static final ExecutorService processExecutor = Executors.newCachedThreadPool(new
NamedThreadFactory("ProcessRunner"));
    +
    +    private static String readStream(final InputStream inputStream) throws IOException
{
    +        final StringBuilder sb = new StringBuilder();
    +        final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
    +        String line;
    +        while ((line = bufferedReader.readLine()) != null) {
    +            sb.append(line);
    +            sb.append("\n");
    +        }
    +        return sb.toString();
    +    }
    +
    +    public static ProcessResult executeCommands(final List<String> commands, final
Duration timeOut) {
    +        Preconditions.checkArgument(commands != null && timeOut != null);
    +
    +        int retVal = -2;
    +        String stdOutput = null;
    +        String stdError = null;
    +
    +        try {
    +            final Process process = new ProcessBuilder().command(commands).start();
    +            if (timeOut.getStandardSeconds() > 0) {
    +                final Future<Integer> processFuture = processExecutor.submit(new
Callable<Integer>() {
    +                    @Override
    +                    public Integer call() throws Exception {
    +                        return process.waitFor();
    +                    }
    +                });
    +                try {
    +                    retVal = processFuture.get(timeOut.getStandardSeconds(), TimeUnit.SECONDS);
    +                } catch (ExecutionException e) {
    +                    retVal = -1;
    +                    stdError = e.getMessage();
    +                    if (LOG.isTraceEnabled()) {
    +                        LOG.trace("Failed to complete the requested command due to execution
error: " + e.getMessage());
    +                    }
    +                } catch (TimeoutException e) {
    +                    retVal = -1;
    +                    stdError = "Operation timed out, aborted";
    +                    if (LOG.isTraceEnabled()) {
    +                        LOG.trace("Failed to complete the requested command within timeout:
" + e.getMessage());
    +                    }
    +                } finally {
    +                    if (Strings.isNullOrEmpty(stdError)) {
    +                        stdOutput = readStream(process.getInputStream());
    --- End diff --
    
    Of course I've not, I'll play with it.


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