# LoggingIOSession.java

    /*
     *  Licensed to the Apache Software Foundation (ASF) under one
     *  or more contributor license agreements.  See the NOTICE file
     *  distributed with this work for additional information
     *  regarding copyright ownership.  The ASF 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.apache.synapse.transport.http.conn;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.http.HttpRequest;
    import org.apache.http.message.BasicHttpRequest;
    import org.apache.http.nio.reactor.IOSession;
    import org.apache.http.nio.reactor.SessionBufferStatus;

    import java.io.IOException;
    import java.net.SocketAddress;
    import java.nio.ByteBuffer;
    import java.nio.channels.ByteChannel;
    import java.nio.channels.SelectionKey;
    import java.util.concurrent.atomic.AtomicLong;
    import java.util.regex.Pattern;

    /**
     * Decorator class intended to transparently extend an {@link IOSession}
     * with basic event logging capabilities using Commons Logging.
     */
    class LoggingIOSession implements IOSession {

        private static AtomicLong COUNT = new AtomicLong(0);

        private final Log log;
        private final Wire wirelog;
        private final IOSession session;
        private final ByteChannel channel;
        private final String id;

        public LoggingIOSession(
                final IOSession session, final String id, final Log log, final Log wirelog) {
            super();
            if (session == null) {
                throw new IllegalArgumentException("I/O session may not be null");
            }
            this.session = session;
            this.channel = new LoggingByteChannel();
            this.id = id + "-" + COUNT.incrementAndGet();
            this.log = LogFactory.getLog(session.getClass());
            this.wirelog = new Wire(wirelog);
        }

        public int getStatus() {
            return this.session.getStatus();
        }

        public ByteChannel channel() {
            return this.channel;
        }

        public SocketAddress getLocalAddress() {
            return this.session.getLocalAddress();
        }

        public SocketAddress getRemoteAddress() {
            return this.session.getRemoteAddress();
        }

        public int getEventMask() {
            return this.session.getEventMask();
        }

        private static String formatOps(int ops) {
            StringBuffer buffer = new StringBuffer(6);
            buffer.append('[');
            if ((ops & SelectionKey.OP_READ) > 0) {
                buffer.append('r');
            }
            if ((ops & SelectionKey.OP_WRITE) > 0) {
                buffer.append('w');
            }
            if ((ops & SelectionKey.OP_ACCEPT) > 0) {
                buffer.append('a');
            }
            if ((ops & SelectionKey.OP_CONNECT) > 0) {
                buffer.append('c');
            }
            buffer.append(']');
            return buffer.toString();
        }

        public void setEventMask(int ops) {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Set event mask "
                        + formatOps(ops));
            }
            this.session.setEventMask(ops);
        }

        public void setEvent(int op) {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Set event "
                        + formatOps(op));
            }
            this.session.setEvent(op);
        }

        public void clearEvent(int op) {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Clear event "
                        + formatOps(op));
            }
            this.session.clearEvent(op);
        }

        public void close() {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Close");
            }
            this.session.close();
        }

        public boolean isClosed() {
            return this.session.isClosed();
        }

        public void shutdown() {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Shutdown");
            }
            this.session.shutdown();
        }

        public int getSocketTimeout() {
            return this.session.getSocketTimeout();
        }

        public void setSocketTimeout(int timeout) {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Set timeout "
                        + timeout);
            }
            this.session.setSocketTimeout(timeout);
        }

        public void setBufferStatus(final SessionBufferStatus status) {
            this.session.setBufferStatus(status);
        }

        public boolean hasBufferedInput() {
            return this.session.hasBufferedInput();
        }

        public boolean hasBufferedOutput() {
            return this.session.hasBufferedOutput();
        }

        public Object getAttribute(final String name) {
            return this.session.getAttribute(name);
        }

        public void setAttribute(final String name, final Object obj) {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Set attribute "
                        + name);
            }
            this.session.setAttribute(name, obj);
        }

        public Object removeAttribute(final String name) {
            if (this.log.isDebugEnabled()) {
                this.log.debug("I/O session " + this.id + " " + this.session + ": Remove attribute "
                        + name);
            }
            return this.session.removeAttribute(name);
        }

        class LoggingByteChannel implements ByteChannel {

            public int read(final ByteBuffer dst) throws IOException {
                int bytesRead = session.channel().read(dst);
                if (log.isDebugEnabled()) {
                    log.debug("I/O session " + id + " " + session + ": " + bytesRead + " bytes read");
                }
                if (bytesRead > 0 && (wirelog.isEnabled() || SynapseDebugInfoHolder.getInstance().isDebuggerEnabled())) {
                    String skipLogging = System.getProperty("skip.logging");
                    if ("true".equals(skipLogging)) {
                        Object request = session.getAttribute("http.request");
                        if (request != null) {
                            String uri = ((HttpRequest) request).getRequestLine().toString();
                            Pattern pattern = LoggingUtils.getSkipLoggingMatcher();
                            if (pattern != null && pattern.matcher(uri).find()) {
                                return bytesRead;
                            }
                        }
                    }
                    ByteBuffer b = dst.duplicate();
                    int p = b.position();
                    b.limit(p);
                    b.position(p - bytesRead);
                    wirelog.setSession(session);
                    wirelog.input(b);
                }
                return bytesRead;
            }

            public int write(final ByteBuffer src) throws IOException {
                int byteWritten = session.channel().write(src);
                if (log.isDebugEnabled()) {
                    log.debug("I/O session " + id + " " + session + ": " + byteWritten + " bytes written");
                }
                if (byteWritten > 0 && (wirelog.isEnabled() || SynapseDebugInfoHolder.getInstance().isDebuggerEnabled())) {
                    String skipLogging = System.getProperty("skip.logging");
                    if ("true".equals(skipLogging)) {
                        Object request = session.getAttribute("http.request");
                        if (request != null) {
                            String uri = ((HttpRequest) request).getRequestLine().toString();
                            Pattern pattern = LoggingUtils.getSkipLoggingMatcher();
                            if (pattern != null && pattern.matcher(uri).find()) {
                                return byteWritten;
                            }
                        }
                    }
                    ByteBuffer b = src.duplicate();
                    int p = b.position();
                    b.limit(p);
                    b.position(p - byteWritten);
                    wirelog.setSession(session);
                    wirelog.output(b);
                }
                return byteWritten;
            }

            public void close() throws IOException {
                if (log.isDebugEnabled()) {
                    log.debug("I/O session " + id + " " + session + ": Channel close");
                }
                session.channel().close();
            }

            public boolean isOpen() {
                return session.channel().isOpen();
            }

        }

    }