[UNDERTOW-2372] Add request size and response size exchange attribute…

core/src/main/java/io/undertow/attribute/ExchangeAttributes.java

@@ -123,6 +123,14 @@ public static ExchangeAttribute threadName() {
         return ThreadNameAttribute.INSTANCE;
     }
 
+    public static ExchangeAttribute requestSize() {
+        return RequestSizeAttribute.INSTANCE;
+    }
+
+    public static ExchangeAttribute responseSize() {
+        return ResponseSizeAttribute.INSTANCE;
+    }
+
     public static ExchangeAttribute constant(String value) {
         return new ConstantExchangeAttribute(value);
     }

core/src/main/java/io/undertow/attribute/RequestSizeAttribute.java

@@ -0,0 +1,99 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2014 Red Hat, Inc., and individual contributors
+ * as indicated by the @author tags.
+ *
+ * Licensed 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 io.undertow.attribute;
+
+import io.undertow.server.HttpServerExchange;
+
+/**
+ * Size of request in bytes, including headers, cannot be zero
+ *
+ * @author Marek Jusko
+ */
+
+public class RequestSizeAttribute implements ExchangeAttribute{
+
+    public static final String REQUEST_SIZE_SHORT = "%E";
+    public static final String REQUEST_SIZE = "%{REQUEST_SIZE}";
+    public static final ExchangeAttribute INSTANCE = new RequestSizeAttribute();
+
+    @Override
+    public String readAttribute(HttpServerExchange exchange) {
+        // Initialize requestSize to 2 bytes for the CRLF at the end of headers string
+        long requestSize = 2;
+
+        // Add the request content length if it is specified
+        if (exchange.getRequestContentLength() != -1) {
+            requestSize += exchange.getRequestContentLength();
+        }
+        // Add the size of the request line
+        requestSize += calculateRequestLineSize(exchange);
+
+        // Add the size of all headers
+        requestSize += exchange.getRequestHeaders().getHeadersBytes();
+
+        // Add 4 bytes per header for ": " and CRLF
+        requestSize += exchange.getRequestHeaders().size() * 4L;
+
+        return Long.toString(requestSize);
+    }
+
+    // Request-Line = Method SP Request-URI SP HTTP-Version CRLF
+    private long calculateRequestLineSize(HttpServerExchange exchange) {
+        // Initialize size to 4 bytes for the 2 spaces and CRLF in the request line
+        long size = 4; // 2 spaces + CRLF
+
+        // Add the length of the protocol, request method, and request path
+        size += exchange.getProtocol().length();
+        size += exchange.getRequestMethod().length();
+        size += exchange.getRequestPath().length();
+
+        return size;
+    }
+
+    @Override
+    public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
+        throw new ReadOnlyAttributeException("Size of request, including headers", newValue);
+    }
+
+    @Override
+    public String toString() {
+        return REQUEST_SIZE;
+    }
+
+    public static final class Builder implements ExchangeAttributeBuilder {
+
+        @Override
+        public String name() {
+            return "Request size";
+        }
+
+        @Override
+        public ExchangeAttribute build(String token) {
+            if (token.equals(REQUEST_SIZE) || token.equals(REQUEST_SIZE_SHORT)) {
+                return RequestSizeAttribute.INSTANCE;
+            }
+            return null;
+        }
+
+        @Override
+        public int priority() {
+            return 0;
+        }
+    }
+}

core/src/main/java/io/undertow/attribute/ResponseSizeAttribute.java

@@ -0,0 +1,103 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2014 Red Hat, Inc., and individual contributors
+ * as indicated by the @author tags.
+ *
+ * Licensed 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 io.undertow.attribute;
+
+import io.undertow.server.HttpServerExchange;
+import io.undertow.util.StatusCodes;
+
+/**
+ * Size of response in bytes, including headers
+ *
+ * @author Marek Jusko
+ */
+
+public class ResponseSizeAttribute implements ExchangeAttribute{
+
+    public static final String RESPONSE_SIZE_SHORT = "%O";
+    public static final String RESPONSE_SIZE = "%{RESPONSE_SIZE}";
+    public static final ExchangeAttribute INSTANCE = new ResponseSizeAttribute();
+
+    @Override
+    public String readAttribute(HttpServerExchange exchange) {
+        if (exchange.getResponseHeaders().size() == 0) {
+            return "0";
+        }
+        // Initialize requestSize to 2 bytes for the CRLF at the end of headers string
+        long responseSize = 2;
+
+        // Add the number of bytes sent in the response body
+        responseSize += exchange.getResponseBytesSent();
+
+        // Add the size of the status line
+        responseSize += calculateStatusLineSize(exchange);
+
+        // Add the size of the headers
+        responseSize += exchange.getResponseHeaders().getHeadersBytes();
+
+        // Add 4 bytes per header for ": " and CRLF
+        responseSize += exchange.getResponseHeaders().size() * 4L;
+
+        return Long.toString(responseSize);
+    }
+
+    // Status Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
+    private long calculateStatusLineSize(HttpServerExchange exchange) {
+        // Initialize size to 7 bytes for the spaces, CRLF, and 3-digit status code
+        long size = 7; // 3 for status code + 2 for spaces + 2 for CRLF
+
+        // Add the length of the HTTP version
+        size += exchange.getProtocol().length();
+
+        // Add the length of the status message
+        size += StatusCodes.getReason(exchange.getStatusCode()).length();
+
+        return size;
+    }
+
+    @Override
+    public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
+        throw new ReadOnlyAttributeException("Size of response, including headers", newValue);
+    }
+
+    @Override
+    public String toString() {
+        return RESPONSE_SIZE;
+    }
+
+    public static final class Builder implements ExchangeAttributeBuilder {
+
+        @Override
+        public String name() {
+            return "Response size";
+        }
+
+        @Override
+        public ExchangeAttribute build(String token) {
+            if (token.equals(RESPONSE_SIZE) || token.equals(RESPONSE_SIZE_SHORT)) {
+                return ResponseSizeAttribute.INSTANCE;
+            }
+            return null;
+        }
+
+        @Override
+        public int priority() {
+            return 0;
+        }
+    }
+}

core/src/main/java/io/undertow/server/handlers/accesslog/AccessLogHandler.java

@@ -67,6 +67,9 @@
  * <li><b>%D</b> - Time taken to process the request, in millis
  * <li><b>%T</b> - Time taken to process the request, in seconds
  * <li><b>%I</b> - current Request thread name (can compare later with stacktraces)
+ * <li><b>%E</b> - Size of request in bytes, including headers, cannot be zero
+ * <li><b>%O</b> - Size of response in bytes, including headers
+
  * </ul>
  * <p>In addition, the caller can specify one of the following aliases for
  * commonly utilized patterns:</p>

core/src/main/java/io/undertow/server/handlers/accesslog/ExtendedAccessLogParser.java

@@ -39,9 +39,11 @@
 import io.undertow.attribute.RequestMethodAttribute;
 import io.undertow.attribute.RequestProtocolAttribute;
 import io.undertow.attribute.RequestSchemeAttribute;
+import io.undertow.attribute.RequestSizeAttribute;
 import io.undertow.attribute.RequestURLAttribute;
 import io.undertow.attribute.ResponseCodeAttribute;
 import io.undertow.attribute.ResponseHeaderAttribute;
+import io.undertow.attribute.ResponseSizeAttribute;
 import io.undertow.attribute.ResponseTimeAttribute;
 import io.undertow.attribute.SecureExchangeAttribute;
 import io.undertow.attribute.SubstituteEmptyWrapper;
@@ -249,6 +251,10 @@ protected ExchangeAttribute getLogElement(String token, PatternTokenizer tokeniz
             }
         } else if ("bytes".equals(token)) {
             return new BytesSentAttribute(true);
+        } else if ("responseSize".equals(token)) {
+            return ResponseSizeAttribute.INSTANCE;
+        } else if ("requestSize".equals(token)) {
+            return RequestSizeAttribute.INSTANCE;
         } else if ("cached".equals(token)) {
             /* I don't know how to evaluate this! */
             return new ConstantExchangeAttribute("-");

core/src/main/java/io/undertow/util/HeaderMap.java

@@ -20,6 +20,7 @@
 
 import static org.wildfly.common.Assert.checkNotNullParam;
 
+import java.nio.charset.StandardCharsets;
 import java.util.AbstractCollection;
 import java.util.Arrays;
 import java.util.Collection;
@@ -834,6 +835,22 @@ public boolean contains(String headerName) {
         return false;
     }
 
+    public long getHeadersBytes() {
+        long headersSize = 0;
+        long cookie = this.fastIterateNonEmpty();
+        while (cookie != -1L) {
+            HeaderValues header = this.fiCurrent(cookie);
+            headersSize += header.getHeaderName().length(); // Size of the header name
+            for (String value : header) {
+                headersSize += value.getBytes(StandardCharsets.UTF_8).length; // Size of each header value
+            }
+
+            // Get the next non-empty header cookie
+            cookie = this.fiNextNonEmpty(cookie);
+        }
+        return headersSize;
+    }
+
     // compare
 
     @Override

core/src/main/resources/META-INF/services/io.undertow.attribute.ExchangeAttributeBuilder

@@ -38,3 +38,6 @@ io.undertow.attribute.NullAttribute$Builder
 io.undertow.attribute.StoredResponse$Builder
 io.undertow.attribute.ResponseReasonPhraseAttribute$Builder
 io.undertow.attribute.RemoteObfuscatedIPAttribute$Builder
+io.undertow.attribute.RequestSizeAttribute$Builder
+io.undertow.attribute.ResponseSizeAttribute$Builder
+