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Code Issues Releases Wiki Activity

Make PartialOptions immutable

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- Switch to using OptionalInt/OptionalLong instead of @Nullable
   Long/Integers. I know IntelliJ complains, but it avoids the risk of
   implicit unboxing.

 - Instead of mutating PartialOptions, we now define a merge() function
   which returns the new options. This simplifies the logic in
   AddressRule a whole bunch.
This commit is contained in:
Jonathan Coates 2022-10-31 09:08:39 +00:00
parent 14cb97cba1
commit 7701b343fb
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GPG Key ID: B9E431FF07C98D06
6 changed files with 70 additions and 62 deletions
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9
src/main/java/dan200/computercraft/ComputerCraft.java
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@ -18,10 +18,7 @@
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.*;
import java.util.concurrent.TimeUnit;
@Mod( ComputerCraft.MOD_ID )
@ -44,8 +41,8 @@ public final class ComputerCraft
public static boolean httpEnabled = true;
public static boolean httpWebsocketEnabled = true;
public static List<AddressRule> httpRules = Collections.unmodifiableList( Arrays.asList(
AddressRule.parse( "$private", null, Action.DENY.toPartial() ),
AddressRule.parse( "*", null, Action.ALLOW.toPartial() )
AddressRule.parse( "$private", OptionalInt.empty(), Action.DENY.toPartial() ),
AddressRule.parse( "*", OptionalInt.empty(), Action.ALLOW.toPartial() )
) );
public static int httpMaxRequests = 16;

6
src/main/java/dan200/computercraft/core/apis/http/options/Action.java
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@ -6,13 +6,17 @@
package dan200.computercraft.core.apis.http.options;
import javax.annotation.Nonnull;
import java.util.OptionalInt;
import java.util.OptionalLong;
public enum Action
{
ALLOW,
DENY;
private final PartialOptions partial = new PartialOptions( this, null, null, null, null );
private final PartialOptions partial = new PartialOptions(
this, OptionalLong.empty(), OptionalLong.empty(), OptionalInt.empty(), OptionalInt.empty()
);
@Nonnull
public PartialOptions toPartial()

31
src/main/java/dan200/computercraft/core/apis/http/options/AddressRule.java
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@ -16,6 +16,7 @@
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.OptionalInt;
import java.util.regex.Pattern;
/**
@ -29,10 +30,10 @@ public final class AddressRule
public static final int WEBSOCKET_MESSAGE = 128 * 1024;
private final AddressPredicate predicate;
private final Integer port;
private final OptionalInt port;
private final PartialOptions partial;
private AddressRule( @Nonnull AddressPredicate predicate, @Nullable Integer port, @Nonnull PartialOptions partial )
private AddressRule( @Nonnull AddressPredicate predicate, OptionalInt port, @Nonnull PartialOptions partial )
{
this.predicate = predicate;
this.partial = partial;
@ -40,7 +41,7 @@ private AddressRule( @Nonnull AddressPredicate predicate, @Nullable Integer port
}
@Nullable
public static AddressRule parse( String filter, @Nullable Integer port, @Nonnull PartialOptions partial )
public static AddressRule parse( String filter, OptionalInt port, @Nonnull PartialOptions partial )
{
int cidr = filter.indexOf( '/' );
if( cidr >= 0 )
@ -72,7 +73,7 @@ else if( filter.equalsIgnoreCase( "$private" ) )
*/
private boolean matches( String domain, int port, InetAddress address, Inet4Address ipv4Address )
{
if( this.port != null && this.port != port ) return false;
if( this.port.isPresent() && this.port.getAsInt() != port ) return false;
return predicate.matches( domain )
|| predicate.matches( address )
|| (ipv4Address != null && predicate.matches( ipv4Address ));
@ -80,8 +81,7 @@ private boolean matches( String domain, int port, InetAddress address, Inet4Addr
public static Options apply( Iterable<? extends AddressRule> rules, String domain, InetSocketAddress socketAddress )
{
PartialOptions options = null;
boolean hasMany = false;
PartialOptions options = PartialOptions.DEFAULT;
int port = socketAddress.getPort();
InetAddress address = socketAddress.getAddress();
@ -91,24 +91,9 @@ public static Options apply( Iterable<? extends AddressRule> rules, String domai
for( AddressRule rule : rules )
{
if( !rule.matches( domain, port, address, ipv4Address ) ) continue;
if( options == null )
{
options = rule.partial;
}
else
{
if( !hasMany )
{
options = options.copy();
hasMany = true;
}
options.merge( rule.partial );
}
options = options.merge( rule.partial );
}
return (options == null ? PartialOptions.DEFAULT : options).toOptions();
return options.toOptions();
}
}

24
src/main/java/dan200/computercraft/core/apis/http/options/AddressRuleConfig.java
View File

@ -14,6 +14,8 @@
import javax.annotation.Nullable;
import java.util.Locale;
import java.util.Optional;
import java.util.OptionalInt;
import java.util.OptionalLong;
import java.util.concurrent.ConcurrentHashMap;
/**
@ -48,7 +50,7 @@ public static UnmodifiableConfig makeRule( String host, Action action )
public static boolean checkRule( UnmodifiableConfig builder )
{
String hostObj = get( builder, "host", String.class ).orElse( null );
Integer port = get( builder, "port", Number.class ).map( Number::intValue ).orElse( null );
OptionalInt port = unboxOptInt( get( builder, "port", Number.class ) );
return hostObj != null && checkEnum( builder, "action", Action.class )
&& check( builder, "port", Number.class )
&& check( builder, "timeout", Number.class )
@ -65,11 +67,11 @@ public static AddressRule parseRule( UnmodifiableConfig builder )
if( hostObj == null ) return null;
Action action = getEnum( builder, "action", Action.class ).orElse( null );
Integer port = get( builder, "port", Number.class ).map( Number::intValue ).orElse( null );
Integer timeout = get( builder, "timeout", Number.class ).map( Number::intValue ).orElse( null );
Long maxUpload = get( builder, "max_upload", Number.class ).map( Number::longValue ).orElse( null );
Long maxDownload = get( builder, "max_download", Number.class ).map( Number::longValue ).orElse( null );
Integer websocketMessage = get( builder, "websocket_message", Number.class ).map( Number::intValue ).orElse( null );
OptionalInt port = unboxOptInt( get( builder, "port", Number.class ) );
OptionalInt timeout = unboxOptInt( get( builder, "timeout", Number.class ) );
OptionalLong maxUpload = unboxOptLong( get( builder, "max_upload", Number.class ).map( Number::longValue ) );
OptionalLong maxDownload = unboxOptLong( get( builder, "max_download", Number.class ).map( Number::longValue ) );
OptionalInt websocketMessage = unboxOptInt( get( builder, "websocket_message", Number.class ).map( Number::intValue ) );
PartialOptions options = new PartialOptions(
action,
@ -122,6 +124,16 @@ private static <T extends Enum<T>> Optional<T> getEnum( UnmodifiableConfig confi
return get( config, field, String.class ).map( x -> parseEnum( klass, x ) );
}
private static OptionalLong unboxOptLong( Optional<? extends Number> value )
{
return value.map( Number::intValue ).map( OptionalLong::of ).orElse( OptionalLong.empty() );
}
private static OptionalInt unboxOptInt( Optional<? extends Number> value )
{
return value.map( Number::intValue ).map( OptionalInt::of ).orElse( OptionalInt.empty() );
}
@Nullable
private static <T extends Enum<T>> T parseEnum( Class<T> klass, String x )
{

57
src/main/java/dan200/computercraft/core/apis/http/options/PartialOptions.java
View File

@ -5,21 +5,25 @@
*/
package dan200.computercraft.core.apis.http.options;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.OptionalInt;
import java.util.OptionalLong;
public final class PartialOptions
{
static final PartialOptions DEFAULT = new PartialOptions( null, null, null, null, null );
public static final PartialOptions DEFAULT = new PartialOptions(
null, OptionalLong.empty(), OptionalLong.empty(), OptionalInt.empty(), OptionalInt.empty()
);
Action action;
Long maxUpload;
Long maxDownload;
Integer timeout;
Integer websocketMessage;
private final @Nullable Action action;
private final OptionalLong maxUpload;
private final OptionalLong maxDownload;
private final OptionalInt timeout;
private final OptionalInt websocketMessage;
Options options;
private @Nullable Options options;
PartialOptions( Action action, Long maxUpload, Long maxDownload, Integer timeout, Integer websocketMessage )
public PartialOptions( @Nullable Action action, OptionalLong maxUpload, OptionalLong maxDownload, OptionalInt timeout, OptionalInt websocketMessage )
{
this.action = action;
this.maxUpload = maxUpload;
@ -28,31 +32,36 @@ public final class PartialOptions
this.websocketMessage = websocketMessage;
}
@Nonnull
Options toOptions()
{
if( options != null ) return options;
return options = new Options(
action == null ? Action.DENY : action,
maxUpload == null ? AddressRule.MAX_UPLOAD : maxUpload,
maxDownload == null ? AddressRule.MAX_DOWNLOAD : maxDownload,
timeout == null ? AddressRule.TIMEOUT : timeout,
websocketMessage == null ? AddressRule.WEBSOCKET_MESSAGE : websocketMessage
maxUpload.orElse( AddressRule.MAX_UPLOAD ),
maxDownload.orElse( AddressRule.MAX_DOWNLOAD ),
timeout.orElse( AddressRule.TIMEOUT ),
websocketMessage.orElse( AddressRule.WEBSOCKET_MESSAGE )
);
}
void merge( @Nonnull PartialOptions other )
/**
* Perform a left-biased union of two {@link PartialOptions}.
*
* @param other The other partial options to combine with.
* @return The merged options map.
*/
PartialOptions merge( PartialOptions other )
{
if( action == null && other.action != null ) action = other.action;
if( maxUpload == null && other.maxUpload != null ) maxUpload = other.maxUpload;
if( maxDownload == null && other.maxDownload != null ) maxDownload = other.maxDownload;
if( timeout == null && other.timeout != null ) timeout = other.timeout;
if( websocketMessage == null && other.websocketMessage != null ) websocketMessage = other.websocketMessage;
}
// Short circuit for DEFAULT. This has no effect on the outcome, but avoids an allocation.
if( this == DEFAULT ) return other;
PartialOptions copy()
{
return new PartialOptions( action, maxUpload, maxDownload, timeout, websocketMessage );
return new PartialOptions(
action == null && other.action != null ? other.action : action,
maxUpload.isPresent() ? maxUpload : other.maxUpload,
maxDownload.isPresent() ? maxDownload : other.maxDownload,
timeout.isPresent() ? timeout : other.timeout,
websocketMessage.isPresent() ? websocketMessage : other.websocketMessage
);
}
}

5
src/test/java/dan200/computercraft/core/apis/http/options/AddressRuleTest.java
View File

@ -12,6 +12,7 @@
import java.net.InetSocketAddress;
import java.util.Collections;
import java.util.OptionalInt;
import static org.junit.jupiter.api.Assertions.assertEquals;
@ -21,8 +22,8 @@ public class AddressRuleTest
public void matchesPort()
{
Iterable<AddressRule> rules = Collections.singletonList( AddressRule.parse(
"127.0.0.1", 8080,
new PartialOptions( Action.ALLOW, null, null, null, null )
"127.0.0.1", OptionalInt.of( 8080 ),
Action.ALLOW.toPartial()
) );
assertEquals( apply( rules, "localhost", 8080 ).action, Action.ALLOW );