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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) */
+/* Copyright (c) 2008-2014 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de> */
+/* Copyright (c) 2014-2016 Ulrich Sibiller <uli42@gmx.de> */
+/* Copyright (c) 2014-2016 Mihai Moldovan <ionic@ionic.de> */
+/* Copyright (c) 2011-2016 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
+/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of the aforementioned persons and companies. */
+/* */
+/* Redistribution and use of the present software is allowed according */
+/* to terms specified in the file LICENSE.nxcomp which comes in the */
+/* source distribution. */
+/* */
+/* All rights reserved. */
+/* */
+/* NOTE: This software has received contributions from various other */
+/* contributors, only the core maintainers and supporters are listed as */
+/* copyright holders. Please contact us, if you feel you should be listed */
+/* as copyright holder, as well. */
+/* */
+/**************************************************************************/
+
+
+#ifndef NXLog_H
+#define NXLog_H
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <sys/time.h>
+
+#include <map>
+#include <stdlib.h>
+#include <string.h>
+
+/** Log severity level */
+enum NXLogLevel
+{
+ NXFATAL,
+ NXERROR,
+ NXWARNING,
+ NXINFO,
+ NXDEBUG,
+ NXLOG_LEVEL_COUNT
+};
+
+
+/**
+ * Log timestamp class
+ *
+ * Stores the timestamp, file, function, line number and log level.
+ * Acts as a manipulator on the NXLog class, telling it a new log
+ * severity level. For instance:
+ *
+ * nx_log << NXLogStamp(...,NXINFO)
+ *
+ * Tells nx_log that now NXINFO type messages are being logged. This
+ * will be applied until a new NXLogStamp with a different level
+ * is sent to the NXLog.
+ */
+class NXLogStamp
+{
+ private:
+ std::string file_;
+ std::string function_;
+ size_t line_;
+ NXLogLevel level_;
+ struct timeval timestamp_;
+
+ public:
+ /** File where the event occurred */
+ std::string file() const
+ {
+ return file_;
+ }
+
+ /** Function where the event occurred */
+ std::string function() const
+ {
+ return function_;
+ }
+
+ /** Line where the event occurred */
+ size_t line() const
+ {
+ return line_;
+ }
+
+ /** Severity level of the event */
+ NXLogLevel level() const
+ {
+ return level_;
+ }
+
+ /** Time of the event */
+ struct timeval timestamp() const
+ {
+ return timestamp_;
+ }
+
+
+ NXLogStamp(const char *file, const char *function, int line, NXLogLevel level)
+ {
+ file_ = std::string(file);
+ function_ = std::string(function);
+ line_ = line;
+ level_ = level;
+ gettimeofday(&timestamp_, NULL);
+ }
+
+};
+
+
+/**
+ * Log class
+ *
+ * Logs events to a stream, filters by file/level
+ */
+class NXLog
+{
+ NXLogLevel level_;
+
+ std::ostream *stream_;
+ std::map< std::string, NXLogLevel > per_file_levels_;
+ bool synchronized_;
+ size_t thread_buffer_size_;
+ pthread_mutex_t output_lock_;
+ pthread_key_t tls_key_;
+
+ bool log_level_;
+ bool log_time_;
+ bool log_unix_time_;
+ bool log_location_;
+ bool log_thread_id_;
+
+ typedef struct per_thread_data_s
+ {
+ NXLogLevel current_level;
+ std::string* current_file;
+ std::string* thread_name;
+ std::stringstream* buffer;
+ NXLog* log_obj;
+ } per_thread_data;
+
+
+ static void free_thread_data(void* arg)
+ {
+ per_thread_data *pdt = (per_thread_data*)arg;
+
+ if ( !pdt )
+ return;
+
+ if ( pdt->log_obj ) {
+ // Ensure the buffer is flushed before thread deletion
+ pdt->log_obj->flush(pdt);
+ }
+
+ delete pdt->current_file;
+ delete pdt->thread_name;
+ delete pdt->buffer;
+ delete pdt;
+ }
+
+ per_thread_data* get_data_int() const
+ {
+ per_thread_data *ret = NULL;
+
+ if ( (ret = (per_thread_data*)pthread_getspecific(tls_key_)) == NULL )
+ {
+ ret = new per_thread_data;
+ ret->current_level = NXDEBUG;
+ ret->buffer = new std::stringstream();
+ ret->current_file = new std::string();
+ ret->thread_name = new std::string();
+ ret->log_obj = const_cast<NXLog*>(this);
+ pthread_setspecific(tls_key_, ret);
+ }
+
+ return ret;
+ }
+
+ per_thread_data* get_data()
+ {
+ return get_data_int();
+ }
+
+ const per_thread_data* get_data() const
+ {
+ return get_data_int();
+ }
+
+ /** Convert NXLogStamp to string according to the current configuration */
+ std::string stamp_to_string(const NXLogStamp& stamp) const;
+
+ /**
+ * Internal flush function
+ *
+ * When a thread is being terminated and free_thread_data gets called,
+ * the TLS key gets set to NULL before the call to free_thread_data,
+ * and the destructor function gets the old value.
+ *
+ * This means that get_data() stops working correctly, and we need
+ * to be able to pass the old pointer.
+ */
+ void flush(per_thread_data *pdt)
+ {
+ const std::string str = pdt->buffer->str();
+
+ if (!str.empty())
+ {
+ pthread_mutex_lock(&output_lock_);
+ (*stream()) << str;
+ pthread_mutex_unlock(&output_lock_);
+ pdt->buffer->str("");
+ }
+ }
+
+
+ public:
+ NXLog()
+ {
+ stream_ = &std::cerr;
+ level_ = NXDEBUG;
+ synchronized_ = true;
+ thread_buffer_size_ = 1024;
+ log_level_ = false;
+ log_time_ = false;
+ log_unix_time_ = false;
+ log_location_ = false;
+ log_thread_id_ = false;
+
+ if ( pthread_key_create(&tls_key_, free_thread_data) != 0 )
+ {
+ std::cerr << "pthread_key_create failed" << std::endl;
+ abort();
+ }
+
+ }
+
+ ~NXLog()
+ {
+ per_thread_data *pdt = get_data();
+
+ // Flush any remaining output and delete TLS data
+ free_thread_data(pdt);
+
+ pthread_key_delete(tls_key_);
+ }
+
+ /** Minimum severity level to output */
+ NXLogLevel level() const
+ {
+ return level_;
+ }
+
+ void level(NXLogLevel level)
+ {
+ level_ = level;
+ }
+
+
+ /** Current severity level */
+ NXLogLevel current_level() const
+ {
+ return get_data()->current_level;
+ }
+
+ void current_level(NXLogLevel level)
+ {
+ get_data()->current_level = level;
+ }
+
+ /** Source file from which messages are currently originating */
+ std::string current_file() const
+ {
+ return *get_data()->current_file;
+ }
+
+ void current_file(std::string val)
+ {
+ *get_data()->current_file = val;
+ }
+
+ std::ostream* stream() const
+ {
+ return stream_;
+ }
+
+ void stream(std::ostream *stream)
+ {
+ flush();
+ stream_ = stream;
+ }
+
+ bool synchronized() const {
+ return synchronized_;
+ }
+
+ void synchronized(bool val) {
+ synchronized_ = val;
+ }
+
+ bool log_level() const
+ {
+ return log_level_;
+ }
+
+ void log_level(bool val)
+ {
+ log_level_ = val;
+ }
+
+ bool log_time() const
+ {
+ return log_time_;
+ }
+
+ void log_time(bool val)
+ {
+ log_time_ = val;
+ }
+
+ bool log_unix_time() const
+ {
+ return log_unix_time_;
+ }
+
+ void log_unix_time(bool val)
+ {
+ log_unix_time_ = val;
+ }
+
+ bool log_location() const
+ {
+ return log_location_;
+ }
+
+ void log_location(bool val)
+ {
+ log_location_ = val;
+ }
+
+ bool log_thread_id() const
+ {
+ return log_thread_id_;
+ }
+
+ void log_thread_id(bool val)
+ {
+ log_thread_id_ = val;
+ }
+
+
+ void flush()
+ {
+ per_thread_data *pdt = get_data();
+ flush(pdt);
+ }
+
+ std::string thread_name() const
+ {
+ return *get_data()->thread_name;
+ }
+
+ void thread_name(std::string str)
+ {
+ *get_data()->thread_name = str;
+ }
+
+ void thread_name(const char *str)
+ {
+ *get_data()->thread_name = str;
+ }
+
+ /**
+ * True if a message sent to the NXLog object will be sent to the output
+ *
+ * This considers two things:
+ *
+ * If there's a per-file log level, then it is used
+ * Otherwise the global log level is used.
+ *
+ * If the log level permits the current message to be output, then the
+ * return value is true.
+ */
+ bool will_log() const;
+
+
+ /**
+ * This catches std::flush
+ */
+ NXLog& operator<<(std::ostream& (*F)(std::ostream&))
+ {
+ if ( will_log() )
+ {
+ if ( synchronized() )
+ {
+ per_thread_data *pdt = get_data();
+ (*pdt->buffer) << F;
+ flush();
+ }
+ else
+ {
+ *(stream()) << F;
+ }
+ }
+
+ return *this;
+ }
+
+ template<typename T>
+ friend NXLog& operator<<(NXLog& out, const T& value);
+
+ friend NXLog& operator<< (NXLog& out, const NXLogStamp& value);
+};
+
+
+extern NXLog nx_log;
+
+
+#define nxstamp(l) NXLogStamp(__FILE__, __func__, __LINE__, l)
+
+
+#define nxdbg nx_log << nxstamp(NXDEBUG)
+#define nxinfo nx_log << nxstamp(NXINFO)
+#define nxwarn nx_log << nxstamp(NXWARNING)
+#define nxerr nx_log << nxstamp(NXERROR)
+#define nxfatal nx_log << nxstamp(NXFATAL)
+
+
+NXLog& operator<< (NXLog& out, const NXLogStamp& value);
+
+
+template <typename T>
+bool has_newline(T value)
+{
+ return false;
+}
+
+template <char*>
+static bool has_newline(char *value)
+{
+ return strstr(value, "\n") != NULL;
+}
+
+template <char>
+static bool has_newline(char value)
+{
+ return value == '\n';
+}
+
+template <std::string&>
+static bool has_newline(std::string &value)
+{
+ return value.find_first_of("\n") != std::string::npos;
+}
+
+static size_t ss_length(std::stringstream *ss)
+{
+ size_t pos = ss->tellg();
+ size_t ret = 0;
+ ss->seekg(0, std::ios::end);
+ ret = ss->tellg();
+ ss->seekg(pos, std::ios::beg);
+ return ret;
+}
+
+template <typename T>
+NXLog& operator<<(NXLog& out, const T& value)
+{
+ if ( out.will_log() )
+ {
+ if ( out.synchronized() )
+ {
+ // In synchronized mode, we buffer data until a newline, std::flush, or the buffer
+ // gets full. Then we dump the whole thing at once to the output stream, synchronizing
+ // with a mutex.
+ NXLog::per_thread_data *pdt = out.get_data();
+ (*pdt->buffer) << value;
+
+ if ( ss_length(pdt->buffer) >= out.thread_buffer_size_ || has_newline(value) )
+ out.flush();
+
+ }
+ else
+ {
+ // In async mode we just dump data on the output stream as-is.
+ // Multithreaded code will have ugly output.
+ *(out.stream()) << value;
+ }
+
+ }
+
+ return out;
+}
+
+#endif
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