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HTTP Nukleus Implementation
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/**
 * Copyright 2016-2020 The Reaktivity Project
 *
 * The Reaktivity Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.reaktivity.nukleus.http2.internal;

import static java.nio.charset.StandardCharsets.UTF_8;

import org.agrona.DirectBuffer;
import org.agrona.concurrent.UnsafeBuffer;
import org.reaktivity.nukleus.Configuration;
import org.reaktivity.reaktor.ReaktorConfiguration;

public class Http2Configuration extends Configuration
{
    public static final boolean DEBUG_HTTP2_BUDGETS =
            ReaktorConfiguration.DEBUG_BUDGETS || Boolean.getBoolean("nukleus.http2.debug.budgets");

    public static final IntPropertyDef HTTP2_SERVER_CONCURRENT_STREAMS;
    public static final LongPropertyDef HTTP2_SERVER_MAX_HEADER_LIST_SIZE;
    public static final IntPropertyDef HTTP2_MAX_CONCURRENT_STREAMS_CLEANUP;
    public static final IntPropertyDef HTTP2_STREAMS_CLEANUP_DELAY;
    public static final IntPropertyDef HTTP2_MAX_CONCURRENT_APPLICATION_HEADERS;
    public static final BooleanPropertyDef HTTP2_ACCESS_CONTROL_ALLOW_ORIGIN;
    public static final PropertyDef HTTP2_SERVER_HEADER;

    private static final ConfigurationDef HTTP2_CONFIG;

    static
    {
        final ConfigurationDef config = new ConfigurationDef("nukleus.http2");
        HTTP2_SERVER_CONCURRENT_STREAMS = config.property("server.concurrent.streams", Integer.MAX_VALUE);
        HTTP2_SERVER_MAX_HEADER_LIST_SIZE = config.property("server.max.header.list.size", 8_192L);
        HTTP2_ACCESS_CONTROL_ALLOW_ORIGIN = config.property("server.access.control.allow.origin", false);
        HTTP2_SERVER_HEADER = config.property("server.header");
        HTTP2_MAX_CONCURRENT_STREAMS_CLEANUP = config.property("max.concurrent.streams.cleanup", 1000);
        HTTP2_STREAMS_CLEANUP_DELAY = config.property("streams.cleanup.delay", 100);
        HTTP2_MAX_CONCURRENT_APPLICATION_HEADERS = config.property("max.concurrent.application.headers", 10000);
        HTTP2_CONFIG = config;
    }

    private final DirectBuffer serverHeader;

    public Http2Configuration(
        Configuration config)
    {
        super(HTTP2_CONFIG, config);
        String server = HTTP2_SERVER_HEADER.get(this);
        serverHeader = server != null ? new UnsafeBuffer(server.getBytes(UTF_8)) : null;
    }

    public int serverConcurrentStreams()
    {
        return HTTP2_SERVER_CONCURRENT_STREAMS.getAsInt(this);
    }

    public long serverMaxHeaderListSize()
    {
        return HTTP2_SERVER_MAX_HEADER_LIST_SIZE.getAsLong(this);
    }

    public int maxConcurrentStreamsCleanup()
    {
        return HTTP2_MAX_CONCURRENT_STREAMS_CLEANUP.getAsInt(this);
    }

    public int streamsCleanupDelay()
    {
        return HTTP2_STREAMS_CLEANUP_DELAY.getAsInt(this);
    }

    public int maxConcurrentApplicationHeaders()
    {
        return HTTP2_MAX_CONCURRENT_APPLICATION_HEADERS.getAsInt(this);
    }

    public boolean accessControlAllowOrigin()
    {
        return HTTP2_ACCESS_CONTROL_ALLOW_ORIGIN.get(this);
    }

    public DirectBuffer serverHeader()
    {
        return serverHeader;
    }
}