2 Copyright (c) 2004-2007, John Hurst
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
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9 notice, this list of conditions and the following disclaimer.
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11 notice, this list of conditions and the following disclaimer in the
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13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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29 \brief message logging API
36 #include <KM_platform.h>
42 #define LOG_MSG_IMPL(t) \
44 va_start(args, fmt); \
45 vLogf((t), fmt, &args); \
48 // Returns RESULT_PTR if the given argument is NULL.
49 # define KM_TEST_NULL_L(p) \
51 DefaultLogSink().Error("NULL pointer in file %s, line %d\n", __FILE__, __LINE__); \
52 return Kumu::RESULT_PTR; \
55 // Returns RESULT_PTR if the given argument is NULL. It then
56 // assumes that the argument is a pointer to a string and returns
57 // RESULT_NULL_STR if the first character is '\0'.
59 # define KM_TEST_NULL_STR_L(p) \
61 if ( (p)[0] == '\0' ) { \
62 DefaultLogSink().Error("Empty string in file %s, line %d\n", __FILE__, __LINE__); \
63 return Kumu::RESULT_NULL_STR; \
69 // no log message will exceed this length
70 const ui32_t MaxLogLength = 512;
72 //---------------------------------------------------------------------------------
75 // Log messages are recorded by objects which implement the interface given
76 // in the class ILogSink below. The library maintains a pointer to a default
77 // log sink which is used by the library to report messages.
80 // types of log messages
82 LOG_DEBUG, // detailed developer info
83 LOG_INFO, // developer info
84 LOG_WARN, // library non-fatal or near-miss error
85 LOG_ERROR, // library fatal error
86 LOG_NOTICE, // application user info
87 LOG_ALERT, // application non-fatal or near-miss error
88 LOG_CRIT, // application fatal error
92 // OR these values together to come up with sink filter flags.
93 // The default mask is 0x0000ffff (no time stamp, no pid, all messages).
94 const i32_t LOG_ALLOW_TIMESTAMP = 0x01000000;
95 const i32_t LOG_ALLOW_PID = 0x02000000;
97 const i32_t LOG_ALLOW_DEBUG = 0x00000001;
98 const i32_t LOG_ALLOW_INFO = 0x00000002;
99 const i32_t LOG_ALLOW_WARN = 0x00000004;
100 const i32_t LOG_ALLOW_ERROR = 0x00000008;
101 const i32_t LOG_ALLOW_NOTICE = 0x00000010;
102 const i32_t LOG_ALLOW_ALERT = 0x00000020;
103 const i32_t LOG_ALLOW_CRIT = 0x00000040;
105 const i32_t LOG_ALLOW_DEFAULT = 0x00008000; // show messages having an unknown type
106 const i32_t LOG_ALLOW_NONE = 0x00000000;
107 const i32_t LOG_ALLOW_MESSAGES = 0x0000ffff;
108 const i32_t LOG_ALLOW_ANY = 0xffffffff;
110 // A log message with environmental metadata
111 class LogEntry : public IArchive
120 LogEntry(ui32_t pid, LogType_t t, const char* m) : PID(pid), Type(t), Msg(m) { assert(m); }
121 virtual ~LogEntry() {}
123 bool CreateStringWithFilter(i32_t, std::string&) const;
126 bool HasValue() const { return ! Msg.empty(); }
127 ui32_t ArchiveLength() const;
128 bool Archive(MemIOWriter* Writer) const;
129 bool Unarchive(MemIOReader* Reader);
133 typedef ArchivableList<LogEntry> LogEntryList_t;
142 virtual ~ILogSink() {}
144 void SetFilterFlags(i32_t f) { m_filter = f; }
145 i32_t GetFilterFlags() const { return m_filter; }
146 void SetFilterFlag(i32_t f) { m_filter |= f; }
147 void UnsetFilterFlag(i32_t f) { m_filter &= ~f; }
148 bool TestFilterFlag(i32_t f) const { return ((m_filter & f) != 0); }
151 void Error(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ERROR); }
152 void Warn(const char* fmt, ...) { LOG_MSG_IMPL(LOG_WARN); }
153 void Info(const char* fmt, ...) { LOG_MSG_IMPL(LOG_INFO); }
154 void Debug(const char* fmt, ...) { LOG_MSG_IMPL(LOG_DEBUG); }
156 // application messages
157 void Critical(const char* fmt, ...) { LOG_MSG_IMPL(LOG_CRIT); }
158 void Alert(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ALERT); }
159 void Notice(const char* fmt, ...) { LOG_MSG_IMPL(LOG_NOTICE); }
162 void Logf(LogType_t type, const char* fmt, ...) { LOG_MSG_IMPL(type); }
164 // actual log sink input
165 virtual void vLogf(LogType_t, const char*, va_list*);
166 virtual void WriteEntry(const LogEntry&) = 0;
170 // Sets the internal default sink to the given receiver. If the given value
171 // is zero, sets the default sink to the internally allocated stderr sink.
172 void SetDefaultLogSink(ILogSink* = 0);
174 // Returns the internal default sink.
175 ILogSink& DefaultLogSink();
178 // Sets a log sink as the default until the object is destroyed.
179 // The original default sink is saved and then restored on delete.
182 KM_NO_COPY_CONSTRUCT(LogSinkContext);
187 LogSinkContext(ILogSink& sink) {
188 m_orig = &DefaultLogSink();
189 SetDefaultLogSink(&sink);
193 SetDefaultLogSink(m_orig);
197 //------------------------------------------------------------------------------------------
200 // write messages to two subordinate log sinks
201 class TeeLogSink : public ILogSink
203 KM_NO_COPY_CONSTRUCT(TeeLogSink);
210 TeeLogSink(ILogSink& a, ILogSink& b) : m_a(a), m_b(b) {}
211 virtual ~TeeLogSink() {}
213 void WriteEntry(const LogEntry& Entry) {
214 m_a.WriteEntry(Entry);
215 m_b.WriteEntry(Entry);
219 // collect log messages into the given list
220 class EntryListLogSink : public ILogSink
222 KM_NO_COPY_CONSTRUCT(EntryListLogSink);
225 LogEntryList_t& m_Target;
228 EntryListLogSink(LogEntryList_t& target) : m_Target(target) {}
229 virtual ~EntryListLogSink() {}
231 void WriteEntry(const LogEntry& Entry) {
232 m_Target.push_back(Entry);
237 // write messages to a POSIX stdio stream
238 class StdioLogSink : public ILogSink
242 KM_NO_COPY_CONSTRUCT(StdioLogSink);
245 StdioLogSink() : m_stream(stderr) {};
246 StdioLogSink(FILE* stream) : m_stream(stream) {}
247 virtual ~StdioLogSink() {}
249 void WriteEntry(const LogEntry&);
253 // write messages to the Win32 debug stream
254 class WinDbgLogSink : public ILogSink
257 KM_NO_COPY_CONSTRUCT(WinDbgLogSink);
261 virtual ~WinDbgLogSink() {}
263 void WriteEntry(const LogEntry&);
268 // write messages to a POSIX file descriptor
269 class StreamLogSink : public ILogSink
273 KM_NO_COPY_CONSTRUCT(StreamLogSink);
277 StreamLogSink(int fd) : m_fd(fd) {}
278 virtual ~StreamLogSink() {}
280 void WriteEntry(const LogEntry&);