65 lines
1.7 KiB
Java
65 lines
1.7 KiB
Java
/*
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* This file is part of ComputerCraft - http://www.computercraft.info
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* Copyright Daniel Ratcliffe, 2011-2020. Do not distribute without permission.
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* Send enquiries to dratcliffe@gmail.com
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*/
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package dan200.computercraft.core.apis.http;
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import dan200.computercraft.core.apis.IAPIEnvironment;
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import java.net.URI;
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import java.util.concurrent.Future;
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/**
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* Checks a URL using {@link NetworkUtils#getAddress(String, int, boolean)}}
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*
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* This requires a DNS lookup, and so needs to occur off-thread.
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*/
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public class CheckUrl extends Resource<CheckUrl>
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{
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private static final String EVENT = "http_check";
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private Future<?> future;
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private final IAPIEnvironment environment;
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private final String address;
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private final String host;
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public CheckUrl( ResourceGroup<CheckUrl> limiter, IAPIEnvironment environment, String address, URI uri )
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{
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super( limiter );
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this.environment = environment;
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this.address = address;
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host = uri.getHost();
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}
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public void run()
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{
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if( isClosed() ) return;
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future = NetworkUtils.EXECUTOR.submit( this::doRun );
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checkClosed();
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}
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private void doRun()
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{
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if( isClosed() ) return;
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try
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{
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NetworkUtils.getAddress( host, 80, false );
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if( tryClose() ) environment.queueEvent( EVENT, new Object[] { address, true } );
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}
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catch( HTTPRequestException e )
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{
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if( tryClose() ) environment.queueEvent( EVENT, new Object[] { address, false, e.getMessage() } );
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}
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}
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@Override
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protected void dispose()
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{
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super.dispose();
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future = closeFuture( future );
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}
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}
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