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MINOR: trace/cli: add "show trace" to report trace state and statistics

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The new "show trace" CLI command lists available trace sources and
indicates their status, their sink, and number of dropped packets.
When "show trace <source>" is used, the list of known events is
also listed with their status per action (report/start/stop/pause).
This commit is contained in:
Willy Tarreau 2019-08-12 16:44:33 +02:00
parent aaaf411406
commit 85b157570b
1 changed files with 55 additions and 0 deletions
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55
src/trace.c
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@ -239,8 +239,63 @@ static int cli_parse_trace(char **args, char *payload, struct appctx *appctx, vo
return 0;
}
/* parse the command, returns 1 if a message is returned, otherwise zero */
static int cli_parse_show_trace(char **args, char *payload, struct appctx *appctx, void *private)
{
struct trace_source *src;
const struct sink *sink;
int i;
args++; // make args[1] the 1st arg
if (!*args[1]) {
/* no arg => report the list of supported sources */
chunk_printf(&trash,
"Supported trace sources and states (.=stopped, w=waiting, R=running) :\n"
);
list_for_each_entry(src, &trace_sources, source_link) {
sink = src->sink;
chunk_appendf(&trash, " [%c] %-10s -> %s [drp %u] [%s]\n",
trace_state_char(src->state), src->name.ptr,
sink ? sink->name : "none",
sink ? sink->ctx.dropped : 0,
src->desc);
}
trash.area[trash.data] = 0;
return cli_msg(appctx, LOG_INFO, trash.area);
}
if (!cli_has_level(appctx, ACCESS_LVL_OPER))
return 1;
src = trace_find_source(args[1]);
if (!src)
return cli_err(appctx, "No such trace source");
sink = src->sink;
chunk_printf(&trash, "Trace status for %s:\n", src->name.ptr);
chunk_appendf(&trash, " - sink: %s [%u dropped]\n",
sink ? sink->name : "none", sink ? sink->ctx.dropped : 0);
chunk_appendf(&trash, " - event name : report start stop pause\n");
for (i = 0; src->known_events && src->known_events[i].mask; i++) {
chunk_appendf(&trash, " %-10s : %c %c %c %c\n",
src->known_events[i].name,
trace_event_char(src->report_events, src->known_events[i].mask),
trace_event_char(src->start_events, src->known_events[i].mask),
trace_event_char(src->stop_events, src->known_events[i].mask),
trace_event_char(src->pause_events, src->known_events[i].mask));
}
trash.area[trash.data] = 0;
return cli_msg(appctx, LOG_WARNING, trash.area);
}
static struct cli_kw_list cli_kws = {{ },{
{ { "trace", NULL }, "trace <module> [cmd [args...]] : manage live tracing", cli_parse_trace, NULL, NULL },
{ { "show", "trace", NULL }, "show trace [<module>] : show live tracing state", cli_parse_show_trace, NULL, NULL },
{{},}
}};