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 LOG_ALLOW_ALL (all messages).
94 const i32_t LOG_ALLOW_DEBUG = 0x00000001;
95 const i32_t LOG_ALLOW_INFO = 0x00000002;
96 const i32_t LOG_ALLOW_WARN = 0x00000004;
97 const i32_t LOG_ALLOW_ERROR = 0x00000008;
98 const i32_t LOG_ALLOW_NOTICE = 0x00000010;
99 const i32_t LOG_ALLOW_ALERT = 0x00000020;
100 const i32_t LOG_ALLOW_CRIT = 0x00000040;
101 const i32_t LOG_ALLOW_NONE = 0x00000000;
102 const i32_t LOG_ALLOW_ALL = 0x000fffff;
104 // options are used to control display format
106 const i32_t LOG_OPTION_TYPE = 0x01000000;
107 const i32_t LOG_OPTION_TIMESTAMP = 0x02000000;
108 const i32_t LOG_OPTION_PID = 0x04000000;
109 const i32_t LOG_OPTION_NONE = 0x00000000;
110 const i32_t LOG_OPTION_ALL = 0xfff00000;
112 // A log message with environmental metadata
113 class LogEntry : public IArchive
122 LogEntry(ui32_t pid, LogType_t t, const char* m) : PID(pid), Type(t), Msg(m) { assert(m); }
123 virtual ~LogEntry() {}
125 // returns true if the message Type is present in the mask
126 bool TestFilter(i32_t mask_value) const;
128 // renders the message into outstr using the given dispaly options
130 std::string& CreateStringWithOptions(std::string& outstr, i32_t mask_value) const;
133 bool HasValue() const { return ! Msg.empty(); }
134 ui32_t ArchiveLength() const;
135 bool Archive(MemIOWriter* Writer) const;
136 bool Unarchive(MemIOReader* Reader);
140 typedef ArchivableList<LogEntry> LogEntryList_t;
150 ILogSink() : m_filter(LOG_ALLOW_ALL), m_options(LOG_OPTION_NONE) {}
151 virtual ~ILogSink() {}
153 void SetFilterFlag(i32_t f) { m_filter |= f; }
154 void UnsetFilterFlag(i32_t f) { m_filter &= ~f; }
155 bool TestFilterFlag(i32_t f) const { return ((m_filter & f) == f); }
157 void SetOptionFlag(i32_t o) { m_options |= o; }
158 void UnsetOptionFlag(i32_t o) { m_options &= ~o; }
159 bool TestOptionFlag(i32_t o) const { return ((m_options & o) == o); }
162 void Error(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ERROR); }
163 void Warn(const char* fmt, ...) { LOG_MSG_IMPL(LOG_WARN); }
164 void Info(const char* fmt, ...) { LOG_MSG_IMPL(LOG_INFO); }
165 void Debug(const char* fmt, ...) { LOG_MSG_IMPL(LOG_DEBUG); }
167 // application messages
168 void Critical(const char* fmt, ...) { LOG_MSG_IMPL(LOG_CRIT); }
169 void Alert(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ALERT); }
170 void Notice(const char* fmt, ...) { LOG_MSG_IMPL(LOG_NOTICE); }
173 void Logf(LogType_t type, const char* fmt, ...) { LOG_MSG_IMPL(type); }
175 // actual log sink input
176 virtual void vLogf(LogType_t, const char*, va_list*);
177 virtual void WriteEntry(const LogEntry&) = 0;
181 // Sets the internal default sink to the given receiver. If the given value
182 // is zero, sets the default sink to the internally allocated stderr sink.
183 void SetDefaultLogSink(ILogSink* = 0);
185 // Returns the internal default sink.
186 ILogSink& DefaultLogSink();
189 // Sets a log sink as the default until the object is destroyed.
190 // The original default sink is saved and then restored on delete.
193 KM_NO_COPY_CONSTRUCT(LogSinkContext);
198 LogSinkContext(ILogSink& sink) {
199 m_orig = &DefaultLogSink();
200 SetDefaultLogSink(&sink);
204 SetDefaultLogSink(m_orig);
208 //------------------------------------------------------------------------------------------
211 // write messages to two subordinate log sinks
212 class TeeLogSink : public ILogSink
214 KM_NO_COPY_CONSTRUCT(TeeLogSink);
221 TeeLogSink(ILogSink& a, ILogSink& b) : m_a(a), m_b(b) {}
222 virtual ~TeeLogSink() {}
224 void WriteEntry(const LogEntry& Entry) {
225 m_a.WriteEntry(Entry);
226 m_b.WriteEntry(Entry);
230 // collect log messages into the given list, does not test filter
231 class EntryListLogSink : public ILogSink
234 LogEntryList_t& m_Target;
235 KM_NO_COPY_CONSTRUCT(EntryListLogSink);
239 EntryListLogSink(LogEntryList_t& target) : m_Target(target) {}
240 virtual ~EntryListLogSink() {}
242 void WriteEntry(const LogEntry& Entry);
246 // write messages to a POSIX stdio stream
247 class StdioLogSink : public ILogSink
251 KM_NO_COPY_CONSTRUCT(StdioLogSink);
254 StdioLogSink() : m_stream(stderr) {}
255 StdioLogSink(FILE* stream) : m_stream(stream) {}
256 virtual ~StdioLogSink() {}
258 void WriteEntry(const LogEntry&);
262 // write messages to the Win32 debug stream
263 class WinDbgLogSink : public ILogSink
266 KM_NO_COPY_CONSTRUCT(WinDbgLogSink);
270 virtual ~WinDbgLogSink() {}
272 void WriteEntry(const LogEntry&);
277 // write messages to a POSIX file descriptor
278 class StreamLogSink : public ILogSink
282 KM_NO_COPY_CONSTRUCT(StreamLogSink);
286 StreamLogSink(int fd) : m_fd(fd) {}
287 virtual ~StreamLogSink() {}
289 void WriteEntry(const LogEntry&);