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 default is 0.
105 const i32_t LOG_OPTION_TYPE = 0x01000000;
106 const i32_t LOG_OPTION_TIMESTAMP = 0x02000000;
107 const i32_t LOG_OPTION_PID = 0x04000000;
108 const i32_t LOG_OPTION_NONE = 0x00000000;
109 const i32_t LOG_OPTION_ALL = 0xfff00000;
111 // A log message with environmental metadata
112 class LogEntry : public IArchive
121 LogEntry(ui32_t pid, LogType_t t, const char* m) : PID(pid), Type(t), Msg(m) { assert(m); }
122 virtual ~LogEntry() {}
124 // returns true if the message Type is present in the mask
125 bool TestFilter(i32_t mask_value) const;
127 // renders the message into outstr using the given dispaly options
129 std::string& CreateStringWithOptions(std::string& outstr, i32_t mask_value) const;
132 bool HasValue() const { return ! Msg.empty(); }
133 ui32_t ArchiveLength() const;
134 bool Archive(MemIOWriter* Writer) const;
135 bool Unarchive(MemIOReader* Reader);
139 typedef ArchivableList<LogEntry> LogEntryList;
149 ILogSink() : m_filter(LOG_ALLOW_ALL), m_options(LOG_OPTION_NONE) {}
150 virtual ~ILogSink() {}
152 void SetFilterFlag(i32_t f) { m_filter |= f; }
153 void UnsetFilterFlag(i32_t f) { m_filter &= ~f; }
154 bool TestFilterFlag(i32_t f) const { return ((m_filter & f) == f); }
156 void SetOptionFlag(i32_t o) { m_options |= o; }
157 void UnsetOptionFlag(i32_t o) { m_options &= ~o; }
158 bool TestOptionFlag(i32_t o) const { return ((m_options & o) == o); }
161 void Error(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ERROR); }
162 void Warn(const char* fmt, ...) { LOG_MSG_IMPL(LOG_WARN); }
163 void Info(const char* fmt, ...) { LOG_MSG_IMPL(LOG_INFO); }
164 void Debug(const char* fmt, ...) { LOG_MSG_IMPL(LOG_DEBUG); }
166 // application messages
167 void Critical(const char* fmt, ...) { LOG_MSG_IMPL(LOG_CRIT); }
168 void Alert(const char* fmt, ...) { LOG_MSG_IMPL(LOG_ALERT); }
169 void Notice(const char* fmt, ...) { LOG_MSG_IMPL(LOG_NOTICE); }
172 void Logf(LogType_t type, const char* fmt, ...) { LOG_MSG_IMPL(type); }
174 // actual log sink input
175 virtual void vLogf(LogType_t, const char*, va_list*);
176 virtual void WriteEntry(const LogEntry&) = 0;
180 // Sets the internal default sink to the given receiver. If the given value
181 // is zero, sets the default sink to the internally allocated stderr sink.
182 void SetDefaultLogSink(ILogSink* = 0);
184 // Returns the internal default sink.
185 ILogSink& DefaultLogSink();
188 // Sets a log sink as the default until the object is destroyed.
189 // The original default sink is saved and then restored on delete.
192 KM_NO_COPY_CONSTRUCT(LogSinkContext);
197 LogSinkContext(ILogSink& sink) {
198 m_orig = &DefaultLogSink();
199 SetDefaultLogSink(&sink);
203 SetDefaultLogSink(m_orig);
207 //------------------------------------------------------------------------------------------
210 // write messages to two subordinate log sinks
211 class TeeLogSink : public ILogSink
213 KM_NO_COPY_CONSTRUCT(TeeLogSink);
220 TeeLogSink(ILogSink& a, ILogSink& b) : m_a(a), m_b(b) {}
221 virtual ~TeeLogSink() {}
223 void WriteEntry(const LogEntry& Entry) {
224 m_a.WriteEntry(Entry);
225 m_b.WriteEntry(Entry);
229 // collect log messages into the given list, does not test filter
230 class EntryListLogSink : public ILogSink
233 LogEntryList& m_Target;
234 KM_NO_COPY_CONSTRUCT(EntryListLogSink);
238 EntryListLogSink(LogEntryList& target) : m_Target(target) {}
239 virtual ~EntryListLogSink() {}
241 void WriteEntry(const LogEntry& Entry);
245 // write messages to a POSIX stdio stream
246 class StdioLogSink : public ILogSink
250 KM_NO_COPY_CONSTRUCT(StdioLogSink);
253 StdioLogSink() : m_stream(stderr) {}
254 StdioLogSink(FILE* stream) : m_stream(stream) {}
255 virtual ~StdioLogSink() {}
257 void WriteEntry(const LogEntry&);
261 // write messages to the Win32 debug stream
262 class WinDbgLogSink : public ILogSink
265 KM_NO_COPY_CONSTRUCT(WinDbgLogSink);
269 virtual ~WinDbgLogSink() {}
271 void WriteEntry(const LogEntry&);
276 // write messages to a POSIX file descriptor
277 class StreamLogSink : public ILogSink
281 KM_NO_COPY_CONSTRUCT(StreamLogSink);
285 StreamLogSink(int fd) : m_fd(fd) {}
286 virtual ~StreamLogSink() {}
288 void WriteEntry(const LogEntry&);