int ast_logger_get_queue_limit(void);
-/*!
- \page Scope_Trace Scope Trace
+/*! \defgroup Scope_Trace Scope Trace
+ * @{
+\page basic Basic Usage
The Scope Trace facility allows you to instrument code and output scope entry
and exit messages with associated data.
-
+\par
To start using it:
- * You must have used --enable-dev-mode.
- * In logger.conf, set a logger channel to output the "trace" level.
- * Instrument your code as specified below.
- * Use the cli or cli.conf to enable tracing:
- \verbatim CLI> core set trace <trace_level> [ module ] \endverbatim
-
+ - You must have used --enable-dev-mode.
+ - In logger.conf, set a logger channel to output the "trace" level.
+ - Instrument your code as specified below.
+ - Use the cli or cli.conf to enable tracing:
+\verbatim CLI> core set trace <trace_level> [ module ] \endverbatim
+\par
Its simplest usage requires only 1 macro call that...
- Registers a destructor for a special variable that gets called when the
variable goes out of scope. Uses the same principle as RAII_VAR.
}
\endcode
would produce...
-\b [2020-05-17 15:16:51 -0600] TRACE[953402] : --> res_pjsip_session.c:4283 create_local_sdp PJSIP/1173-00000001
-\b [2020-05-17 15:16:51 -0600] TRACE[953402] : <-- res_pjsip_session.c:4283 create_local_sdp PJSIP/1173-00000001
+\verbatim
+[2020-05-17 15:16:51 -0600] TRACE[953402] : --> res_pjsip_session.c:4283 create_local_sdp PJSIP/1173-00000001
+[2020-05-17 15:16:51 -0600] TRACE[953402] : <-- res_pjsip_session.c:4283 create_local_sdp PJSIP/1173-00000001
+\endverbatim
There is one odd bit. There's no way to capture the line number of there the scope exited
so it's always going to be the line where SCOPE_TRACE is located.
-
+\par
Similar to RAII_VAR, any block scope can be traced including "if", "for", "while", etc.
\note "case" statements don't create a scope block by themselves but you can create
a block for it, or use the generic trace functions mentioned below.
-Scope Output and Level:
-
+\par Scope Output and Level:
Rather than sending trace messages to the debug facility, a new facility "trace" has been
added to logger. A corresponding CLI command "core set trace", and a corresponding "trace"
parameter in asterisk.conf were added. This allows a separate log channel to be created
just for storing trace messages. The levels are the same as those for debug and verbose.
-Scope Indenting:
-
+\par Scope Indenting:
Each time SCOPE_TRACE or SCOPE_TRACE is called, a thread-local indent value is
incremented on scope enter, and decremented on scope exit. This allows output
like the following (timestamp omitted for brevity):
-
+\verbatim
TRACE[953402] : --> res_pjsip_session.c:3940 session_inv_on_tsx_state_changed PJSIP/1173-00000001 TSX State: Proceeding Inv State: CALLING
TRACE[953402] : --> res_pjsip_session.c:3680 handle_incoming PJSIP/1173-00000001
TRACE[953402] : --> res_pjsip_session.c:3661 handle_incoming_response PJSIP/1173-00000001 Method: INVITE Status: 100
TRACE[953402] : <-- res_pjsip_session.c:3661 handle_incoming_response PJSIP/1173-00000001 Method: INVITE Status: 100
TRACE[953402] : <-- res_pjsip_session.c:3680 handle_incoming PJSIP/1173-00000001
TRACE[953402] : <-- res_pjsip_session.c:3940 session_inv_on_tsx_state_changed PJSIP/1173-00000001 TSX State: Proceeding Inv State: CALLING
-
+\endverbatim
\note The trace level indicates which messages to print and has no effect on indent.
-Generic Trace Messages:
-
+\par Generic Trace Messages:
Sometimes you may just want to print a message to the trace log with the appropriate indent
such as when executing a "case" clause in a "switch" statement. For example, the deepest
message in the sample output above (chan_pjsip.c:3245) is just a single message instead of
(int)rdata->msg_info.cseq->method.name.slen, rdata->msg_info.cseq->method.name.ptr, status.code);
\endcode
-/note Final note: The trace facility, like debug, is only available when AST_DEVMODE is defined.
+\note Final note: The trace facility, like debug, is only available when AST_DEVMODE is defined.
+
+*/
+/*!
+\page TRACE_PREFIX TRACE_PREFIX
+The default prefix to each log and trace line is
+<tt>"filename:line function"</tt> which is defined in the
+macro \c _A_ at the top of this file:
+\code
+#define _A_ __FILE__, __LINE__, __FUNCTION__
+\endcode
+They become 3 arguments to the __ast_trace function
+and most of the ast_log* functions. For scope tracing,
+that may be unnecessary clutter in the trace output so
+you can now customise that with the \c _TRACE_PREFIX_
+macro. Like \c _A_, it MUST resolve to 3 arguments:
+\verbatim
+const char *, int, const char *
+\endverbatim
+so the minimum would be:
+\code
+#define _TRACE_PREFIX_ "",0,""
+\endcode
+Normally you should define \c _TRACE_PREFIX_ in your source
+file before including logger.h.
+\code
+#define _TRACE_PREFIX_ "", __LINE__, ""
+#include "asterisk/logger.h"
+\endcode
+You can also define it later in your source file
+but because logger.h sets it to a default value, you'll
+have to undefine it first, then define it your your liking.
+If you want to go back to the default, you'll have to
+undefine it again, then define it to \c _TRACE_PREFIX_DEFAULT_.
+\code
+#undef _TRACE_PREFIX_
+#define _TRACE_PREFIX_ "", __LINE__, ""
+<code>
+#undef _TRACE_PREFIX_
+#define _TRACE_PREFIX_ _TRACE_PREFIX_DEFAULT_
+\endcode
+
+\note Macros have a compilation unit scope so
+defining \c _TRACE_PREFIX_ in one source file does NOT
+make it apply to any others. So if you define it
+in source file A, then call a function in source
+file B, the trace output from B will display based
+on how \c _TRACE_PREFIX_ is defined in B, not A.
*/
+#define _TRACE_PREFIX_DEFAULT_ _A_
+#ifndef _TRACE_PREFIX_
+#define _TRACE_PREFIX_ _TRACE_PREFIX_DEFAULT_
+#endif
+
/*!
* \brief Get the trace level for a module
* \param module the name of module
#define ast_trace_raw(level, indent_type, ...) \
ast_debug(level < 0 ? __scope_level : level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(level < 0 ? __scope_level : level)) { \
- __ast_trace(_A_, indent_type, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, indent_type, 0, " " __VA_ARGS__); \
}
/*!
#define ast_trace(level, ...) \
ast_debug(level < 0 ? __scope_level : level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(level < 0 ? __scope_level : level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_SAME, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_SAME, 0, " " __VA_ARGS__); \
}
/*!
int __scope_task = 0; \
ast_debug(__scope_level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_INC_AFTER, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_INC_AFTER, 0, " " __VA_ARGS__); \
} \
#define SCOPE_ENTER_TASK(level, indent, ...) \
int __scope_task = 1; \
ast_debug(__scope_level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_PROVIDED, indent, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_PROVIDED, indent, " " __VA_ARGS__); \
} \
/*!
#define SCOPE_EXIT(...) \
ast_debug(__scope_level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(__scope_level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
if (__scope_task) { \
_ast_trace_set_indent(0); \
} \
#define SCOPE_EXIT_EXPR(__expr, ...) \
ast_debug(__scope_level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(__scope_level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
if (__scope_task) { \
_ast_trace_set_indent(0); \
} \
#define SCOPE_EXIT_RTN(...) \
ast_debug(__scope_level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(__scope_level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
if (__scope_task) { \
_ast_trace_set_indent(0); \
} \
#define SCOPE_EXIT_RTN_VALUE(__return_value, ...) \
ast_debug(__scope_level, " " __VA_ARGS__); \
if (TRACE_ATLEAST(__scope_level)) { \
- __ast_trace(_A_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
+ __ast_trace(_TRACE_PREFIX_, AST_TRACE_INDENT_DEC_BEFORE, 0, " " __VA_ARGS__); \
if (__scope_task) { \
_ast_trace_set_indent(0); \
} \
}
#endif
+/*!
+ * @}
+ */
+
#endif /* _ASTERISK_LOGGER_H */
projects / thirdparty / asterisk.git / commitdiff
