/*
-Copyright (c) 2004-2006, John Hurst
+Copyright (c) 2004-2009, John Hurst
All rights reserved.
Redistribution and use in source and binary forms, with or without
#include <KM_platform.h>
#include <KM_mutex.h>
+#include <KM_util.h>
#include <stdarg.h>
#include <errno.h>
+#include <iosfwd>
+#include <set>
-#define LOG_MSG_IMPL(t) va_list args; va_start(args, fmt); vLogf((t), fmt, &args); va_end(args)
+#define LOG_MSG_IMPL(t) \
+ va_list args; \
+ va_start(args, fmt); \
+ vLogf((t), fmt, &args); \
+ va_end(args)
+
+// Returns RESULT_PTR if the given argument is NULL.
+# define KM_TEST_NULL_L(p) \
+ if ( (p) == 0 ) { \
+ DefaultLogSink().Error("NULL pointer in file %s, line %d\n", __FILE__, __LINE__); \
+ return Kumu::RESULT_PTR; \
+ }
+
+// Returns RESULT_PTR if the given argument is NULL. It then
+// assumes that the argument is a pointer to a string and returns
+// RESULT_NULL_STR if the first character is '\0'.
+//
+# define KM_TEST_NULL_STR_L(p) \
+ KM_TEST_NULL_L(p); \
+ if ( (p)[0] == '\0' ) { \
+ DefaultLogSink().Error("Empty string in file %s, line %d\n", __FILE__, __LINE__); \
+ return Kumu::RESULT_NULL_STR; \
+ }
namespace Kumu
//---------------------------------------------------------------------------------
// message logging
- // Error and debug messages will be delivered to an object having this interface.
- // The default implementation sends only LOG_ERROR and LOG_WARN messages to stderr.
- // To receive LOG_INFO or LOG_DEBUG messages, or to send messages somewhere other
- // than stderr, implement this interface and register an instance of your new class
- // by calling SetDefaultLogSink().
+ // Log messages are recorded by objects which implement the interface given
+ // in the class ILogSink below. The library maintains a pointer to a default
+ // log sink which is used by the library to report messages.
+ //
+
+ // types of log messages
+ enum LogType_t {
+ LOG_DEBUG, // detailed developer info
+ LOG_INFO, // developer info
+ LOG_WARN, // library non-fatal or near-miss error
+ LOG_ERROR, // library fatal error
+ LOG_NOTICE, // application user info
+ LOG_ALERT, // application non-fatal or near-miss error
+ LOG_CRIT, // application fatal error
+ LOG_MAX
+ };
+
+
+ // OR these values together to come up with sink filter flags.
+ // The default mask is LOG_ALLOW_ALL (all messages).
+ const i32_t LOG_ALLOW_DEBUG = 0x00000001;
+ const i32_t LOG_ALLOW_INFO = 0x00000002;
+ const i32_t LOG_ALLOW_WARN = 0x00000004;
+ const i32_t LOG_ALLOW_ERROR = 0x00000008;
+ const i32_t LOG_ALLOW_NOTICE = 0x00000010;
+ const i32_t LOG_ALLOW_ALERT = 0x00000020;
+ const i32_t LOG_ALLOW_CRIT = 0x00000040;
+ const i32_t LOG_ALLOW_NONE = 0x00000000;
+ const i32_t LOG_ALLOW_ALL = 0x000fffff;
+
+ // options are used to control display format default is 0.
+ const i32_t LOG_OPTION_TYPE = 0x01000000;
+ const i32_t LOG_OPTION_TIMESTAMP = 0x02000000;
+ const i32_t LOG_OPTION_PID = 0x04000000;
+ const i32_t LOG_OPTION_NONE = 0x00000000;
+ const i32_t LOG_OPTION_ALL = 0xfff00000;
+
+ // A log message with environmental metadata
+ class LogEntry : public IArchive
+ {
+ public:
+ ui32_t PID;
+ Timestamp EventTime;
+ LogType_t Type;
+ std::string Msg;
+
+ LogEntry() {}
+ LogEntry(ui32_t pid, LogType_t t, const char* m) : PID(pid), Type(t), Msg(m) { assert(m); }
+ virtual ~LogEntry() {}
+
+ // returns true if the message Type is present in the mask
+ bool TestFilter(i32_t mask_value) const;
+
+ // renders the message into outstr using the given dispaly options
+ // returns outstr&
+ std::string& CreateStringWithOptions(std::string& outstr, i32_t mask_value) const;
+
+ // IArchive
+ bool HasValue() const { return ! Msg.empty(); }
+ ui32_t ArchiveLength() const;
+ bool Archive(MemIOWriter* Writer) const;
+ bool Unarchive(MemIOReader* Reader);
+ };
+
+ //
+ std::basic_ostream<char, std::char_traits<char> >&
+ operator<<(std::basic_ostream<char, std::char_traits<char> >& strm, LogEntry const& Entry);
+
+
+ typedef ArchivableList<LogEntry> LogEntryList;
+
+ //
class ILogSink
{
- public:
- enum LogType_t { LOG_DEBUG, LOG_INFO, LOG_WARN, LOG_ERROR,
- LOG_NOTICE, LOG_ALERT, LOG_CRIT };
+ protected:
+ i32_t m_filter;
+ i32_t m_options;
+ Mutex m_lock;
+ std::set<ILogSink*> m_listeners;
+
+ // you must obtain m_lock BEFORE calling this from your own WriteEntry
+ void WriteEntryToListeners(const LogEntry& entry)
+ {
+ std::set<ILogSink*>::iterator i;
+ for ( i = m_listeners.begin(); i != m_listeners.end(); ++i )
+ (*i)->WriteEntry(entry);
+ }
+ KM_NO_COPY_CONSTRUCT(ILogSink);
+
+ public:
+ ILogSink() : m_filter(LOG_ALLOW_ALL), m_options(LOG_OPTION_NONE) {}
virtual ~ILogSink() {}
- void Critical(const char* fmt, ...) { LOG_MSG_IMPL(LOG_CRIT); }
- void Alert(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ALERT); }
- void Notice(const char* fmt, ...) { LOG_MSG_IMPL(LOG_NOTICE); }
+ void SetFilterFlag(i32_t f) { m_filter |= f; }
+ void UnsetFilterFlag(i32_t f) { m_filter &= ~f; }
+ bool TestFilterFlag(i32_t f) const { return ((m_filter & f) == f); }
+
+ void SetOptionFlag(i32_t o) { m_options |= o; }
+ void UnsetOptionFlag(i32_t o) { m_options &= ~o; }
+ bool TestOptionFlag(i32_t o) const { return ((m_options & o) == o); }
+
+ void AddListener(ILogSink& s) {
+ if ( &s != this )
+ {
+ AutoMutex l(m_lock);
+ m_listeners.insert(&s);
+ }
+ }
+
+ void DelListener(ILogSink& s) {
+ AutoMutex l(m_lock);
+ m_listeners.erase(&s);
+ }
+
+ // library messages
void Error(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ERROR); }
void Warn(const char* fmt, ...) { LOG_MSG_IMPL(LOG_WARN); }
void Info(const char* fmt, ...) { LOG_MSG_IMPL(LOG_INFO); }
void Debug(const char* fmt, ...) { LOG_MSG_IMPL(LOG_DEBUG); }
- void Logf(ILogSink::LogType_t type, const char* fmt, ...) { LOG_MSG_IMPL(type); }
- virtual void vLogf(LogType_t, const char*, va_list*) = 0; // log a formatted string with a va_list struct
+
+ // application messages
+ void Critical(const char* fmt, ...) { LOG_MSG_IMPL(LOG_CRIT); }
+ void Alert(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ALERT); }
+ void Notice(const char* fmt, ...) { LOG_MSG_IMPL(LOG_NOTICE); }
+
+ // message with type
+ void Logf(LogType_t type, const char* fmt, ...) { LOG_MSG_IMPL(type); }
+
+ // actual log sink input
+ virtual void vLogf(LogType_t, const char*, va_list*);
+ virtual void WriteEntry(const LogEntry&) = 0;
};
+
// Sets the internal default sink to the given receiver. If the given value
// is zero, sets the default sink to the internally allocated stderr sink.
void SetDefaultLogSink(ILogSink* = 0);
// Returns the internal default sink.
ILogSink& DefaultLogSink();
+
+ // attach a log sink as a listener until deleted
+ class LogSinkListenContext
+ {
+ ILogSink* m_log_source;
+ ILogSink* m_sink;
+ KM_NO_COPY_CONSTRUCT(LogSinkListenContext);
+ LogSinkListenContext();
+
+ public:
+ LogSinkListenContext(ILogSink& source, ILogSink& sink)
+ {
+ m_log_source = &source;
+ m_sink = &sink;
+ m_log_source->AddListener(*m_sink);
+ }
+
+ ~LogSinkListenContext()
+ {
+ m_log_source->DelListener(*m_sink);
+ }
+ };
+
+
+ //------------------------------------------------------------------------------------------
//
+
+ // collect log messages into the given list, does not test filter
+ class EntryListLogSink : public ILogSink
+ {
+ LogEntryList& m_Target;
+ KM_NO_COPY_CONSTRUCT(EntryListLogSink);
+ EntryListLogSink();
+
+ public:
+ EntryListLogSink(LogEntryList& target) : m_Target(target) {}
+ virtual ~EntryListLogSink() {}
+
+ void WriteEntry(const LogEntry& Entry);
+ };
+
+
+ // write messages to a POSIX stdio stream
class StdioLogSink : public ILogSink
{
- Mutex m_Lock;
FILE* m_stream;
KM_NO_COPY_CONSTRUCT(StdioLogSink);
public:
- StdioLogSink() : m_stream(stderr) {};
- StdioLogSink(FILE* stream) : m_stream(stream) {}
+ StdioLogSink() : m_stream(stderr) {}
+ StdioLogSink(FILE* stream) : m_stream(stream) {}
virtual ~StdioLogSink() {}
- virtual void vLogf(LogType_t, const char*, va_list*);
+
+ void WriteEntry(const LogEntry&);
};
#ifdef KM_WIN32
- //
+ // write messages to the Win32 debug stream
class WinDbgLogSink : public ILogSink
{
- Mutex m_Lock;
KM_NO_COPY_CONSTRUCT(WinDbgLogSink);
public:
WinDbgLogSink() {}
virtual ~WinDbgLogSink() {}
- virtual void vLogf(LogType_t, const char*, va_list*);
- };
-#else
+ void WriteEntry(const LogEntry&);
+ };
+#endif
- //
+#ifndef KM_WIN32
+ // write messages to a POSIX file descriptor
class StreamLogSink : public ILogSink
{
- Mutex m_Lock;
int m_fd;
KM_NO_COPY_CONSTRUCT(StreamLogSink);
StreamLogSink();
public:
StreamLogSink(int fd) : m_fd(fd) {}
virtual ~StreamLogSink() {}
- virtual void vLogf(LogType_t, const char*, va_list*);
+
+ void WriteEntry(const LogEntry&);
+ };
+
+ // write messages to the syslog facility
+ class SyslogLogSink : public ILogSink
+ {
+ KM_NO_COPY_CONSTRUCT(SyslogLogSink);
+ SyslogLogSink();
+
+ public:
+ SyslogLogSink(const std::string& source_name, int facility);
+ virtual ~SyslogLogSink();
+ void WriteEntry(const LogEntry&);
};
+
+ // convert a string into the appropriate syslog facility id
+ int SyslogNameToFacility(const std::string& facility_name);
+
#endif
+
} // namespace Kumu
#endif // _KM_LOG_H_
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