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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * 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.
+ */
+
+#ifndef __VOM_LOGGER_H__
+#define __VOM_LOGGER_H__
+
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+#include "vom/enum_base.hpp"
+
+namespace VOM {
+struct log_level_t : enum_base<log_level_t>
+{
+ const static log_level_t CRITICAL;
+ const static log_level_t ERROR;
+ const static log_level_t WARNING;
+ const static log_level_t INFO;
+ const static log_level_t DEBUG;
+
+private:
+ /**
+ * Private constructor taking the value and the string name
+ */
+ log_level_t(int v, const std::string& s);
+
+ /*
+ * not allowed to construct
+ */
+ log_level_t() = delete;
+};
+
+/**
+ * Ideally we'd use the boost logger but that is not prevelent
+ * in many distros. So something simple here instead.
+ */
+class log_t
+{
+public:
+ /**
+ *
+ */
+ class handler
+ {
+ public:
+ /**
+ * Default Constructor
+ */
+ handler() = default;
+
+ /**
+ * Default Destructor
+ */
+ virtual ~handler() = default;
+
+ /**
+ * Handle a log message
+ */
+ virtual void handle_message(const std::string& file,
+ const int line,
+ const std::string& function,
+ const log_level_t& level,
+ const std::string& message) = 0;
+ };
+
+ /**
+ * Construct a logger
+ */
+ log_t(handler* h);
+ log_t();
+
+ /**
+ * The configured level
+ */
+ const log_level_t& level() const;
+
+ /**
+ * set the logging level
+ */
+ void set(const log_level_t& level);
+
+ /**
+ * set a file to receive the logging data
+ */
+ void set(handler* h);
+
+ /**
+ * An entry in the log
+ */
+ class entry
+ {
+ public:
+ entry(const char* file,
+ const char* function,
+ int line,
+ const log_level_t& level);
+ ~entry();
+
+ std::stringstream& stream();
+
+ private:
+ const std::string m_file;
+ const std::string m_function;
+ const log_level_t m_level;
+ const int m_line;
+
+ std::stringstream m_stream;
+ };
+ /**
+ * Register a log handler to receive the log output
+ */
+ void register_handler(handler& h);
+
+private:
+ void write(const std::string& file,
+ const int line,
+ const std::string& function,
+ const log_level_t& level,
+ const std::string& message);
+
+ /**
+ * the configured logging level
+ */
+ log_level_t m_level;
+
+ /**
+ * Pointer to a registered handler. Null if no handler registerd
+ */
+ handler* m_handler;
+};
+
+class file_handler : public log_t::handler
+{
+public:
+ file_handler(const std::string& ofile);
+ ~file_handler();
+
+ virtual void handle_message(const std::string& file,
+ const int line,
+ const std::string& function,
+ const log_level_t& level,
+ const std::string& message);
+
+private:
+ /**
+ * Opened file for debugging
+ */
+ std::ofstream m_file_stream;
+};
+
+class cout_handler : public log_t::handler
+{
+public:
+ cout_handler() = default;
+ ~cout_handler() = default;
+ virtual void handle_message(const std::string& file,
+ const int line,
+ const std::string& function,
+ const log_level_t& level,
+ const std::string& message);
+};
+
+/**
+ * Return a log object into which VPP objects can write
+ */
+log_t& logger();
+
+#define VOM_LOG(lvl) \
+ if (lvl >= logger().level()) \
+ log_t::entry(__FILE__, __FUNCTION__, __LINE__, lvl).stream()
+};
+
+/*
+ * fd.io coding-style-patch-verification: OFF
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif