1 files changed, 135 insertions, 0 deletions
diff --git a/common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/servlet/LoggingFilter.java b/common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/servlet/LoggingFilter.java
new file mode 100644
index 0000000000..53923d7784
--- /dev/null
+++ b/common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/servlet/LoggingFilter.java
@@ -0,0 +1,135 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * SDC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.core.logging.servlet;
+
+import org.slf4j.MDC;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicLong;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+
+/**
+ * <p>Pushes information required by EELF onto MDC (Mapped Diagnostic Context).</p> <p>This is
+ * servlet filter that should be configured in <i>web.xml</i> to be used. Example:</p>
+ * <pre>
+ *  &lt;filter&gt;
+ *      &lt;filter-name&gt;LoggingServletFilter&lt;/filter-name&gt;
+ *      &lt;filter-class&gt;LoggingFilter&lt;/filter-class&gt;
+ *  &lt;/filter&gt;
+ *  &lt;filter-mapping&gt;
+ *      &lt;filter-name&gt;LoggingServletFilter&lt;/filter-name&gt;
+ *      &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
+ *  &lt;/filter-mapping&gt;
+ * </pre>
+ */
+public class LoggingFilter implements Filter {
+
+  // should be cashed to avoid low-level call, but with a timeout to account for IP or FQDN changes
+  private static final HostAddressCache HOST_ADDRESS = new HostAddressCache();
+  private static final String UNKNOWN = "UNKNOWN";
+
+  public void destroy() {
+  }
+
+  /**
+   * Do Filter.
+   *
+   * @param request the request
+   */
+  public void doFilter(ServletRequest request, ServletResponse response,
+                       FilterChain chain) throws IOException, ServletException {
+
+    try {
+
+      MDC.clear();
+
+      MDC.put("RequestId", UUID.randomUUID().toString());
+      MDC.put("ServiceInstanceId", "N/A"); // not applicable
+      MDC.put("ServiceName", "SDC");
+      MDC.put("InstanceUUID", "N/A");
+
+      // For some reason chooses IPv4 or IPv6 in a random way
+      MDC.put("RemoteHost", request.getRemoteHost());
+
+      InetAddress host = HOST_ADDRESS.get();
+
+      String ipAddress;
+      String hostName;
+      if (host == null) {
+        ipAddress = UNKNOWN;
+        hostName = UNKNOWN;
+      } else {
+        ipAddress = host.getHostAddress();
+        hostName = host.getHostName();
+      }
+
+      MDC.put("ServerIPAddress", ipAddress);
+      MDC.put("ServerFQDN", hostName);
+
+      // TODO: Clarify what these stand for
+      //        MDC.put("AlertSeverity", );
+      //        MDC.put("Timer", );
+
+      chain.doFilter(request, response);
+
+    } finally {
+      MDC.clear();
+    }
+  }
+
+  public void init(FilterConfig config) throws ServletException {
+  }
+
+  private static class HostAddressCache {
+
+    private static final long REFRESH_TIME = 1000L;
+
+    private AtomicLong lastUpdated = new AtomicLong(0L);
+    private InetAddress hostAddress;
+
+    public InetAddress get() {
+
+      long current = System.currentTimeMillis();
+      if (current - lastUpdated.get() > REFRESH_TIME) {
+
+        synchronized (this) {
+
+          try {
+            lastUpdated.set(current); // set now to register the attempt even if failed
+            hostAddress = InetAddress.getLocalHost();
+          } catch (UnknownHostException unknownHostException) {
+            hostAddress = null;
+          }
+        }
+      }
+
+      return hostAddress;
+    }
+  }
+}