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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.task.util.process;
/**
* Base class for child process related exceptions, with a util to build an error message
* that includes a large part of the output.
*
* @author hakonhall
*/
@SuppressWarnings("serial")
public abstract class ChildProcessException extends RuntimeException {
private static final int MAX_OUTPUT_PREFIX = 200;
private static final int MAX_OUTPUT_SUFFIX = 200;
// Omitting a number of chars less than 10 or less than 10% would be ridiculous.
private static final int MAX_OUTPUT_SLACK = Math.max(10, (10 * (MAX_OUTPUT_PREFIX + MAX_OUTPUT_SUFFIX)) / 100);
/**
* An exception with a message of the following format:
* Command 'COMMANDLINE' PROBLEM: stdout/stderr: 'OUTPUT'
*
* If the output of the terminated command is too large it will be sampled.
*
* @param problem E.g. "terminated with exit code 1"
* @param commandLine The command that failed in a concise (e.g. shell-like) format
* @param possiblyHugeOutput The output of the command
*/
protected ChildProcessException(String problem, String commandLine, String possiblyHugeOutput) {
super(makeSnippet(problem, commandLine, possiblyHugeOutput));
}
protected ChildProcessException(RuntimeException cause,
String problem,
String commandLine,
String possiblyHugeOutput) {
super(makeSnippet(problem, commandLine, possiblyHugeOutput), cause);
}
private static String makeSnippet(String problem,
String commandLine,
String possiblyHugeOutput) {
return makeSnippet(
problem,
commandLine,
possiblyHugeOutput,
MAX_OUTPUT_PREFIX,
MAX_OUTPUT_SUFFIX,
MAX_OUTPUT_SLACK);
}
// Package-private instead of private for testing.
static String makeSnippet(String problem,
String commandLine,
String possiblyHugeOutput,
int maxOutputPrefix,
int maxOutputSuffix,
int maxOutputSlack) {
StringBuilder stringBuilder = new StringBuilder()
.append("Command '")
.append(commandLine)
.append("' ")
.append(problem)
.append(": stdout/stderr: '");
if (possiblyHugeOutput.length() <= maxOutputPrefix + maxOutputSuffix + maxOutputSlack) {
stringBuilder.append(possiblyHugeOutput);
} else {
stringBuilder.append(possiblyHugeOutput.substring(0, maxOutputPrefix))
.append("... [")
.append(possiblyHugeOutput.length() - maxOutputPrefix - maxOutputSuffix)
.append(" chars omitted] ...")
.append(possiblyHugeOutput.substring(possiblyHugeOutput.length() - maxOutputSuffix));
}
stringBuilder.append("'");
return stringBuilder.toString();
}
}
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