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ShellSession.java
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ShellSession.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.server.rest.management.console;
import java.rmi.RemoteException;
import java.util.HashMap;
import org.neo4j.helpers.collection.Pair;
import org.neo4j.kernel.extension.GlobalKernelExtensions;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.logging.Log;
import org.neo4j.logging.internal.LogService;
import org.neo4j.shell.ShellClient;
import org.neo4j.shell.ShellException;
import org.neo4j.shell.ShellServer;
import org.neo4j.shell.impl.AbstractClient;
import org.neo4j.shell.impl.CollectingOutput;
import org.neo4j.shell.impl.SameJvmClient;
import org.neo4j.shell.impl.ShellServerKernelExtension;
import org.neo4j.shell.kernel.GraphDatabaseShellServer;
public class ShellSession implements ScriptSession
{
private static volatile ShellServer fallbackServer;
private final ShellClient client;
private final CollectingOutput output;
private final Log log;
public ShellSession( GraphDatabaseAPI graph )
{
try
{
this.log = graph.getDependencyResolver().resolveDependency( LogService.class ).getInternalLog( getClass() );
ShellServerKernelExtension extension = graph.getDependencyResolver().resolveDependency( GlobalKernelExtensions
.class ).resolveDependency( ShellServerKernelExtension.class );
ShellServer server = extension.getServer();
if ( server == null )
{
server = getFallbackServer( graph );
}
output = new CollectingOutput();
client = new SameJvmClient( new HashMap<>(), server, output );
output.asString();
}
catch ( RemoteException | ShellException e )
{
throw new RuntimeException( "Unable to start shell client", e );
}
}
private ShellServer getFallbackServer( GraphDatabaseAPI graph )
{
if ( fallbackServer == null )
{
try
{
fallbackServer = new GraphDatabaseShellServer( graph, false );
}
catch ( RemoteException e )
{
throw new RuntimeException( "Unable to start the fallback shellserver", e );
}
}
return fallbackServer;
}
@Override
public Pair<String, String> evaluate( String script )
{
if ( script.equals( "init()" ) )
{
return Pair.of( "", client.getPrompt() );
}
if ( script.equals( "exit" ) || script.equals( "quit" ) )
{
return Pair.of( "Sorry, can't do that.", client.getPrompt() );
}
try
{
log.debug( script );
client.evaluate( removeInitialNewline( script ) );
return Pair.of( output.asString(), client.getPrompt() );
}
catch ( ShellException e )
{
String message = ((AbstractClient) client).shouldPrintStackTraces() ?
ShellException.stackTraceAsString( e ) : ShellException.getFirstMessage( e );
return Pair.of( message, client.getPrompt() );
}
}
private String removeInitialNewline( String script )
{
return script != null && script.startsWith( "\n" ) ? script.substring( 1 ) : script;
}
}