Provide the possibility to log user data from exchange

extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/attribute/ExchangeDataAttribute.java

@@ -0,0 +1,48 @@
+package io.quarkus.vertx.http.runtime.attribute;
+
+import io.vertx.ext.web.RoutingContext;
+
+/**
+ * Provide entries from the "user data" section of the RoutingContext
+ */
+public class ExchangeDataAttribute implements ExchangeAttribute {
+
+    private final String dataKey;
+
+    public ExchangeDataAttribute(String dataKey) {
+        this.dataKey = dataKey;
+    }
+
+    @Override
+    public String readAttribute(RoutingContext exchange) {
+        return exchange.get(dataKey);
+    }
+
+    @Override
+    public void writeAttribute(RoutingContext exchange, String newValue) throws ReadOnlyAttributeException {
+        throw new ReadOnlyAttributeException();
+    }
+
+    public static final class Builder implements ExchangeAttributeBuilder {
+
+        @Override
+        public String name() {
+            return "Exchange data";
+        }
+
+        @Override
+        public ExchangeAttribute build(final String token) {
+            if (token.startsWith("%{d,") && token.endsWith("}")) {
+                final String dataItemName = token.substring(4, token.length() - 1);
+                return new ExchangeDataAttribute(dataItemName);
+            }
+            return null;
+        }
+
+        @Override
+        public int priority() {
+            return 0;
+        }
+    }
+
+}

extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/filters/accesslog/AccessLogHandler.java

@@ -84,6 +84,7 @@
  * <li><code>%{c,xxx}</code> for a specific cookie
  * <li><code>%{r,xxx}</code> xxx is an attribute in the ServletRequest
  * <li><code>%{s,xxx}</code> xxx is an attribute in the HttpSession
+ * <li><code>%{d,xxx}</code> xxx is a data item in the exchange</li>
  * </ul>
  *
  * @author Stuart Douglas

extensions/vertx-http/runtime/src/main/resources/META-INF/services/io.quarkus.vertx.http.runtime.attribute.ExchangeAttributeBuilder

@@ -27,4 +27,5 @@ io.quarkus.vertx.http.runtime.attribute.SecureExchangeAttribute$Builder
 io.quarkus.vertx.http.runtime.attribute.RemoteHostAttribute$Builder
 io.quarkus.vertx.http.runtime.attribute.RequestPathAttribute$Builder
 io.quarkus.vertx.http.runtime.attribute.NullAttribute$Builder
-io.quarkus.vertx.http.runtime.attribute.AllRequestHeadersAttribute$Builder
+io.quarkus.vertx.http.runtime.attribute.AllRequestHeadersAttribute$Builder
+io.quarkus.vertx.http.runtime.attribute.ExchangeDataAttribute$Builder