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java/org/apache/coyote/http2/ConnectionSettingsBase.java
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java/org/apache/coyote/http2/ConnectionSettingsBase.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.coyote.http2;
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import java.util.HashMap;
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import java.util.Map;
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import org.apache.juli.logging.Log;
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import org.apache.juli.logging.LogFactory;
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import org.apache.tomcat.util.res.StringManager;
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public abstract class ConnectionSettingsBase<T extends Throwable> {
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private final Log log = LogFactory.getLog(ConnectionSettingsBase.class); // must not be static
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private final StringManager sm = StringManager.getManager(ConnectionSettingsBase.class);
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private final String connectionId;
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// Limits
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protected static final int MAX_WINDOW_SIZE = (1 << 31) - 1;
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protected static final int MIN_MAX_FRAME_SIZE = 1 << 14;
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protected static final int MAX_MAX_FRAME_SIZE = (1 << 24) - 1;
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protected static final long UNLIMITED = ((long)1 << 32); // Use the maximum possible
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protected static final int MAX_HEADER_TABLE_SIZE = 1 << 16;
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// Defaults (defined by the specification)
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protected static final int DEFAULT_HEADER_TABLE_SIZE = Hpack.DEFAULT_TABLE_SIZE;
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protected static final boolean DEFAULT_ENABLE_PUSH = true;
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protected static final long DEFAULT_MAX_CONCURRENT_STREAMS = UNLIMITED;
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protected static final int DEFAULT_INITIAL_WINDOW_SIZE = (1 << 16) - 1;
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protected static final int DEFAULT_MAX_FRAME_SIZE = MIN_MAX_FRAME_SIZE;
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protected static final long DEFAULT_MAX_HEADER_LIST_SIZE = 1 << 15;
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protected Map<Setting,Long> current = new HashMap<>();
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protected Map<Setting,Long> pending = new HashMap<>();
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public ConnectionSettingsBase(String connectionId) {
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this.connectionId = connectionId;
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// Set up the defaults
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current.put(Setting.HEADER_TABLE_SIZE, Long.valueOf(DEFAULT_HEADER_TABLE_SIZE));
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current.put(Setting.ENABLE_PUSH, Long.valueOf(DEFAULT_ENABLE_PUSH ? 1 : 0));
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current.put(Setting.MAX_CONCURRENT_STREAMS, Long.valueOf(DEFAULT_MAX_CONCURRENT_STREAMS));
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current.put(Setting.INITIAL_WINDOW_SIZE, Long.valueOf(DEFAULT_INITIAL_WINDOW_SIZE));
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current.put(Setting.MAX_FRAME_SIZE, Long.valueOf(DEFAULT_MAX_FRAME_SIZE));
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current.put(Setting.MAX_HEADER_LIST_SIZE, Long.valueOf(DEFAULT_MAX_HEADER_LIST_SIZE));
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}
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public void set(Setting setting, long value) throws T {
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if (log.isDebugEnabled()) {
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log.debug(sm.getString("connectionSettings.debug",
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connectionId, getEndpointName(), setting, Long.toString(value)));
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}
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switch(setting) {
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case HEADER_TABLE_SIZE:
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validateHeaderTableSize(value);
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break;
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case ENABLE_PUSH:
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validateEnablePush(value);
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break;
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case MAX_CONCURRENT_STREAMS:
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// No further validation required
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break;
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case INITIAL_WINDOW_SIZE:
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validateInitialWindowSize(value);
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break;
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case MAX_FRAME_SIZE:
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validateMaxFrameSize(value);
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break;
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case MAX_HEADER_LIST_SIZE:
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// No further validation required
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break;
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case UNKNOWN:
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// Unrecognised. Ignore it.
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log.warn(sm.getString("connectionSettings.unknown",
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connectionId, setting, Long.toString(value)));
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return;
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}
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set(setting, Long.valueOf(value));
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}
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synchronized void set(Setting setting, Long value) {
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current.put(setting, value);
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}
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public int getHeaderTableSize() {
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return getMinInt(Setting.HEADER_TABLE_SIZE);
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}
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public boolean getEnablePush() {
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long result = getMin(Setting.ENABLE_PUSH);
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return result != 0;
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}
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public long getMaxConcurrentStreams() {
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return getMax(Setting.MAX_CONCURRENT_STREAMS);
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}
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public int getInitialWindowSize() {
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return getMaxInt(Setting.INITIAL_WINDOW_SIZE);
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}
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public int getMaxFrameSize() {
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return getMaxInt(Setting.MAX_FRAME_SIZE);
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}
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public long getMaxHeaderListSize() {
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return getMax(Setting.MAX_HEADER_LIST_SIZE);
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}
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private synchronized long getMin(Setting setting) {
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Long pendingValue = pending.get(setting);
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long currentValue = current.get(setting).longValue();
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if (pendingValue == null) {
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return currentValue;
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} else {
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return Math.min(pendingValue.longValue(), currentValue);
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}
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}
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private synchronized int getMinInt(Setting setting) {
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long result = getMin(setting);
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if (result > Integer.MAX_VALUE) {
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return Integer.MAX_VALUE;
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} else {
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return (int) result;
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}
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}
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private synchronized long getMax(Setting setting) {
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Long pendingValue = pending.get(setting);
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long currentValue = current.get(setting).longValue();
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if (pendingValue == null) {
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return currentValue;
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} else {
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return Math.max(pendingValue.longValue(), currentValue);
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}
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}
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private synchronized int getMaxInt(Setting setting) {
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long result = getMax(setting);
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if (result > Integer.MAX_VALUE) {
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return Integer.MAX_VALUE;
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} else {
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return (int) result;
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}
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}
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private void validateHeaderTableSize(long headerTableSize) throws T {
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if (headerTableSize > MAX_HEADER_TABLE_SIZE) {
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String msg = sm.getString("connectionSettings.headerTableSizeLimit",
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connectionId, Long.toString(headerTableSize));
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throwException(msg, Http2Error.PROTOCOL_ERROR);
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}
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}
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private void validateEnablePush(long enablePush) throws T {
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// Can't be less than zero since the result of the byte->long conversion
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// will never be negative
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if (enablePush > 1) {
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String msg = sm.getString("connectionSettings.enablePushInvalid",
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connectionId, Long.toString(enablePush));
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throwException(msg, Http2Error.PROTOCOL_ERROR);
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}
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}
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private void validateInitialWindowSize(long initialWindowSize) throws T {
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if (initialWindowSize > MAX_WINDOW_SIZE) {
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String msg = sm.getString("connectionSettings.windowSizeTooBig",
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connectionId, Long.toString(initialWindowSize), Long.toString(MAX_WINDOW_SIZE));
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throwException(msg, Http2Error.FLOW_CONTROL_ERROR);
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}
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}
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private void validateMaxFrameSize(long maxFrameSize) throws T {
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if (maxFrameSize < MIN_MAX_FRAME_SIZE || maxFrameSize > MAX_MAX_FRAME_SIZE) {
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String msg = sm.getString("connectionSettings.maxFrameSizeInvalid",
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connectionId, Long.toString(maxFrameSize), Integer.toString(MIN_MAX_FRAME_SIZE),
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Integer.toString(MAX_MAX_FRAME_SIZE));
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throwException(msg, Http2Error.PROTOCOL_ERROR);
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}
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}
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abstract void throwException(String msg, Http2Error error) throws T;
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abstract String getEndpointName();
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}
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