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lib/ngx_pagespeed/src/ngx_message_handler.h

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+// Copyright 2013 Google Inc.
+//
+// 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.
+
+// Author: oschaaf@gmail.com (Otto van der Schaaf)
+
+#ifndef NGX_MESSAGE_HANDLER_H_
+#define NGX_MESSAGE_HANDLER_H_
+
+extern "C" {
+  #include <ngx_auto_config.h>
+#if (NGX_THREADS)
+  #include <ngx_thread.h>
+#endif
+  #include <ngx_core.h>
+  #include <ngx_log.h>
+}
+
+#include <cstdarg>
+
+#include "pagespeed/kernel/base/basictypes.h"
+#include "pagespeed/kernel/base/message_handler.h"
+#include "pagespeed/kernel/base/string.h"
+#include "pagespeed/kernel/base/string_util.h"
+#include "pagespeed/system/system_message_handler.h"
+
+namespace net_instaweb {
+
+class AbstractMutex;
+class Timer;
+
+// Implementation of a message handler that uses ngx_log_error()
+// logging to emit messages, with a fallback to GoogleMessageHandler
+class NgxMessageHandler : public SystemMessageHandler {
+ public:
+  explicit NgxMessageHandler(Timer* timer, AbstractMutex* mutex);
+
+  // Installs a signal handler for common crash signals that tries to print
+  // out a backtrace.
+  static void InstallCrashHandler(ngx_log_t* log);
+
+  void set_log(ngx_log_t* log) { log_ = log; }
+  ngx_log_t* log() { return log_; }
+
+ protected:
+  virtual void MessageSImpl(MessageType type, const GoogleString& message);
+
+  virtual void FileMessageSImpl(MessageType type, const char* file,
+                                int line, const GoogleString& message);
+
+ private:
+  ngx_uint_t GetNgxLogLevel(MessageType type);
+  ngx_log_t* log_;
+
+  DISALLOW_COPY_AND_ASSIGN(NgxMessageHandler);
+};
+
+}  // namespace net_instaweb
+
+#endif  // NGX_MESSAGE_HANDLER_H_