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DiagnosticsReportSources.java
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DiagnosticsReportSources.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.diagnostics;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.logging.RotatingFileOutputStreamSupplier;
import static org.neo4j.logging.RotatingFileOutputStreamSupplier.getAllArchives;
/**
* Contains helper methods to create create {@link DiagnosticsReportSource}.
*/
public class DiagnosticsReportSources
{
private DiagnosticsReportSources()
{
throw new AssertionError( "No instances" );
}
/**
* Create a diagnostics source the will copy a file into the archive.
*
* @param destination final destination in archive.
* @param fs filesystem abstraction to use.
* @param source source file to archive
* @return a diagnostics source consuming a file.
*/
public static DiagnosticsReportSource newDiagnosticsFile( String destination, FileSystemAbstraction fs,
File source )
{
return new DiagnosticsFileReportSource( destination, fs, source );
}
/**
* This is to be used by loggers that uses {@link RotatingFileOutputStreamSupplier}.
*
* @param destination final destination in archive.
* @param fs filesystem abstraction to use.
* @param file input log file, should be without rotation numbers.
* @return a list diagnostics sources consisting of the log file including all rotated away files.
*/
public static List<DiagnosticsReportSource> newDiagnosticsRotatingFile( String destination,
FileSystemAbstraction fs, File file )
{
ArrayList<DiagnosticsReportSource> files = new ArrayList<>();
files.add( newDiagnosticsFile( destination, fs, file ) );
List<File> allArchives = getAllArchives( fs, file );
for ( File archive : allArchives )
{
String name = archive.getName();
String n = name.substring( name.lastIndexOf( '.' ) );
files.add( newDiagnosticsFile( destination + "." + n, fs, archive ) );
}
return files;
}
/**
* Create a diagnostics source from a string. Can be used to dump simple messages to a file in the archive. Files
* are opened with append option so this method can be used to accumulate messages from multiple source to a single
* file in the archive.
*
* @param destination final destination in archive.
* @param messageSupplier a string supplier with the final message.
* @return a diagnostics source consuming a string.
*/
public static DiagnosticsReportSource newDiagnosticsString( String destination,
Supplier<String> messageSupplier )
{
return new DiagnosticsStringReportSource( destination, messageSupplier );
}
private static class DiagnosticsFileReportSource implements DiagnosticsReportSource
{
private final String destination;
private final FileSystemAbstraction fs;
private final File source;
DiagnosticsFileReportSource( String destination, FileSystemAbstraction fs, File source )
{
this.destination = destination;
this.fs = fs;
this.source = source;
}
@Override
public String destinationPath()
{
return destination;
}
@Override
public void addToArchive( Path archiveDestination, DiagnosticsReporterProgress progress )
throws IOException
{
long size = fs.getFileSize( source );
InputStream in = fs.openAsInputStream( source );
// Track progress of the file reading, source might be a very large file
try ( ProgressAwareInputStream inStream = new ProgressAwareInputStream( in, size, progress::percentChanged ) )
{
Files.copy( inStream, archiveDestination );
}
}
@Override
public long estimatedSize( DiagnosticsReporterProgress progress )
{
return fs.getFileSize( source );
}
}
private static class DiagnosticsStringReportSource implements DiagnosticsReportSource
{
private final String destination;
private final Supplier<String> messageSupplier;
private DiagnosticsStringReportSource( String destination, Supplier<String> messageSupplier )
{
this.destination = destination;
this.messageSupplier = messageSupplier;
}
@Override
public String destinationPath()
{
return destination;
}
@Override
public void addToArchive( Path archiveDestination, DiagnosticsReporterProgress progress )
throws IOException
{
String message = messageSupplier.get();
Files.write( archiveDestination, message.getBytes( StandardCharsets.UTF_8 ), StandardOpenOption.CREATE,
StandardOpenOption.APPEND );
}
@Override
public long estimatedSize( DiagnosticsReporterProgress progress )
{
return 0; // Size of strings should be negligible
}
}
}