Log HTTP activity to $site_path/logs/httpd_log

If we aren't in proxy server mode we now log HTTP request to an
NCSA combined log format file.  Unfortunately I wrote our own log
file implementation because the stock Jetty NCSARequestLog class
uses a different file rotation system than we prefer.

Change-Id: If4996833e56b130da1e278bc3ab22aceedfd3138
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-pgm/src/main/java/com/google/inject/servlet/GuiceHelper.java

@@ -0,0 +1,36 @@
+// Copyright (C) 2010 The Android Open Source Project
+//
+// 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 com.google.inject.servlet;
+
+import com.google.inject.servlet.GuiceFilter.Context;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class GuiceHelper {
+  public static void runInContext(HttpServletRequest req,
+      HttpServletResponse rsp, Runnable thunk) {
+    Context previous = GuiceFilter.localContext.get();
+    try {
+      GuiceFilter.localContext.set(new Context(req, rsp));
+      thunk.run();
+    } finally {
+      GuiceFilter.localContext.set(previous);
+    }
+  }
+
+  private GuiceHelper() {
+  }
+}