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MINOR: trace: add the file name and line number in the prefix 

We now pass an extra argument "where" to the trace() call, which
is supposed to be an ist made of the concatenation of the filename
and the line number. We only keep the last 10 chars from this string
since the end of file names is most often easy to recognize. This
gives developers useful information at very low cost.
This commit is contained in:
Willy Tarreau 2019-08-12 17:27:09 +02:00
parent 4c2ae48375
commit 419bd49f0b
2 changed files with 19 additions and 5 deletions
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6
include/proto/trace.h
View File

@ -34,7 +34,7 @@
extern struct list trace_sources;
extern THREAD_LOCAL struct buffer trace_buf;
void __trace(uint64_t mask, struct trace_source *src, const struct ist msg);
void __trace(uint64_t mask, struct trace_source *src, const struct ist where, const struct ist msg);
/* return a single char to describe a trace state */
static inline char trace_state_char(enum trace_state st)
@ -66,10 +66,10 @@ static inline void trace_register_source(struct trace_source *source)
}
/* sends a trace for the given source */
static inline void trace(uint64_t mask, struct trace_source *src, const struct ist msg)
static inline void trace(uint64_t mask, struct trace_source *src, const struct ist where, const struct ist msg)
{
if (unlikely(src->state != TRACE_STATE_STOPPED))
__trace(mask, src, msg);
__trace(mask, src, where, msg);
}
#endif /* _PROTO_TRACE_H */

18
src/trace.c
View File

@ -49,8 +49,10 @@ REGISTER_PER_THREAD_ALLOC(alloc_trace_buffers_per_thread);
REGISTER_PER_THREAD_FREE(free_trace_buffers_per_thread);
/* write a message for the given trace source */
void __trace(uint64_t mask, struct trace_source *src, const struct ist msg)
void __trace(uint64_t mask, struct trace_source *src, const struct ist where, const struct ist msg)
{
struct ist line[8];
if (likely(src->state == TRACE_STATE_STOPPED))
return;
@ -75,8 +77,20 @@ void __trace(uint64_t mask, struct trace_source *src, const struct ist msg)
if ((src->report_events & mask) == 0)
goto end;
/* log the logging location truncated to 10 chars from the right so that
* the line number and the end of the file name are there.
*/
line[0] = ist("[");
line[1] = where;
if (line[1].len > 10) {
line[1].ptr += (line[1].len - 10);
line[1].len = 10;
}
line[2] = ist("] ");
line[3] = msg;
if (src->sink)
sink_write(src->sink, &msg, 1);
sink_write(src->sink, line, 4);
end:
/* check if we need to stop the trace now */