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BUG/MINOR: contrib/prometheus-exporter: Restart labels dump at the right pos 

For some metrics, several lines are produced per entity, one per label
value. For instance, the health-check status (ST_F_CHECK_STATUS) or the
entity status (ST_F_STATUS). The dump may be stopped in the middle of the
labels processing if the output buffer is full. This means the next time, we
must take care to restart on the right label value.

For now, this part is buggy and we always restart to dump all the label
values again from the beginning. To be sure to restart at the right
position, the field <ctx.stats.st_code> in the applet context is used to
save the last position. Of course, we take care to reset this value when
necessary.

This fix is specific for 2.4. No backport needed.
This commit is contained in:
Christopher Faulet 2021-02-01 15:05:21 +01:00
parent 32ef48e984
commit 040b1195f7
1 changed files with 21 additions and 16 deletions
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37
contrib/prometheus-exporter/service-prometheus.c
View File

@ -604,7 +604,6 @@ static int promex_dump_front_metrics(struct appctx *appctx, struct htx *htx)
struct field *stats = stat_l[STATS_DOMAIN_PROXY];
int ret = 1;
enum promex_front_state state;
int i;
for (;appctx->st2 < ST_F_TOTAL_FIELDS; appctx->st2++) {
if (!(promex_st_metrics[appctx->st2].flags & appctx->ctx.stats.flags))
@ -628,14 +627,15 @@ static int promex_dump_front_metrics(struct appctx *appctx, struct htx *htx)
switch (appctx->st2) {
case ST_F_STATUS:
state = !px->disabled;
for (i = 0; i < PROMEX_FRONT_STATE_COUNT; i++) {
for (; appctx->ctx.stats.st_code < PROMEX_FRONT_STATE_COUNT; appctx->ctx.stats.st_code++) {
labels[1].name = ist("state");
labels[1].value = promex_front_st[i];
val = mkf_u32(FO_STATUS, state == i);
labels[1].value = promex_front_st[appctx->ctx.stats.st_code];
val = mkf_u32(FO_STATUS, state == appctx->ctx.stats.st_code);
if (!promex_dump_metric(appctx, htx, prefix, &promex_st_metrics[appctx->st2],
&val, labels, &out, max))
goto full;
}
appctx->ctx.stats.st_code = 0;
goto next_px;
case ST_F_REQ_RATE_MAX:
case ST_F_REQ_TOT:
@ -705,7 +705,6 @@ static int promex_dump_back_metrics(struct appctx *appctx, struct htx *htx)
int ret = 1;
double secs;
enum promex_back_state state;
int i;
for (;appctx->st2 < ST_F_TOTAL_FIELDS; appctx->st2++) {
if (!(promex_st_metrics[appctx->st2].flags & appctx->ctx.stats.flags))
@ -729,14 +728,15 @@ static int promex_dump_back_metrics(struct appctx *appctx, struct htx *htx)
switch (appctx->st2) {
case ST_F_STATUS:
state = ((px->lbprm.tot_weight > 0 || !px->srv) ? 1 : 0);
for (i = 0; i < PROMEX_BACK_STATE_COUNT; i++) {
for (; appctx->ctx.stats.st_code < PROMEX_BACK_STATE_COUNT; appctx->ctx.stats.st_code++) {
labels[1].name = ist("state");
labels[1].value = promex_back_st[i];
val = mkf_u32(FO_STATUS, state == i);
labels[1].value = promex_back_st[appctx->ctx.stats.st_code];
val = mkf_u32(FO_STATUS, state == appctx->ctx.stats.st_code);
if (!promex_dump_metric(appctx, htx, prefix, &promex_st_metrics[appctx->st2],
&val, labels, &out, max))
goto full;
}
appctx->ctx.stats.st_code = 0;
goto next_px;
case ST_F_QTIME:
secs = (double)swrate_avg(px->be_counters.q_time, TIME_STATS_SAMPLES) / 1000.0;
@ -838,7 +838,6 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
double secs;
enum promex_srv_state state;
const char *check_state;
int i;
for (;appctx->st2 < ST_F_TOTAL_FIELDS; appctx->st2++) {
if (!(promex_st_metrics[appctx->st2].flags & appctx->ctx.stats.flags))
@ -871,14 +870,15 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
switch (appctx->st2) {
case ST_F_STATUS:
state = promex_srv_status(sv);
for (i = 0; i < PROMEX_SRV_STATE_COUNT; i++) {
val = mkf_u32(FO_STATUS, state == i);
for (; appctx->ctx.stats.st_code < PROMEX_SRV_STATE_COUNT; appctx->ctx.stats.st_code++) {
val = mkf_u32(FO_STATUS, state == appctx->ctx.stats.st_code);
labels[2].name = ist("state");
labels[2].value = promex_srv_st[i];
labels[2].value = promex_srv_st[appctx->ctx.stats.st_code];
if (!promex_dump_metric(appctx, htx, prefix, &promex_st_metrics[appctx->st2],
&val, labels, &out, max))
goto full;
}
appctx->ctx.stats.st_code = 0;
goto next_sv;
case ST_F_QTIME:
secs = (double)swrate_avg(sv->counters.q_time, TIME_STATS_SAMPLES) / 1000.0;
@ -916,17 +916,18 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
if ((sv->check.state & (CHK_ST_ENABLED|CHK_ST_PAUSED)) != CHK_ST_ENABLED)
goto next_sv;
for (i = 0; i < HCHK_STATUS_SIZE; i++) {
if (get_check_status_result(i) < CHK_RES_FAILED)
for (; appctx->ctx.stats.st_code < HCHK_STATUS_SIZE; appctx->ctx.stats.st_code++) {
if (get_check_status_result(appctx->ctx.stats.st_code) < CHK_RES_FAILED)
continue;
val = mkf_u32(FO_STATUS, sv->check.status == i);
check_state = get_check_status_info(i);
val = mkf_u32(FO_STATUS, sv->check.status == appctx->ctx.stats.st_code);
check_state = get_check_status_info(appctx->ctx.stats.st_code);
labels[2].name = ist("state");
labels[2].value = ist2(check_state, strlen(check_state));
if (!promex_dump_metric(appctx, htx, prefix, &promex_st_metrics[appctx->st2],
&val, labels, &out, max))
goto full;
}
appctx->ctx.stats.st_code = 0;
goto next_sv;
case ST_F_CHECK_CODE:
if ((sv->check.state & (CHK_ST_ENABLED|CHK_ST_PAUSED)) != CHK_ST_ENABLED)
@ -1006,6 +1007,7 @@ static int promex_dump_metrics(struct appctx *appctx, struct stream_interface *s
appctx->ctx.stats.obj1 = NULL;
appctx->ctx.stats.obj2 = NULL;
appctx->ctx.stats.flags |= (PROMEX_FL_METRIC_HDR|PROMEX_FL_INFO_METRIC);
appctx->ctx.stats.st_code = 0;
appctx->st2 = INF_NAME;
appctx->st1 = PROMEX_DUMPER_GLOBAL;
/* fall through */
@ -1024,6 +1026,7 @@ static int promex_dump_metrics(struct appctx *appctx, struct stream_interface *s
appctx->ctx.stats.obj2 = NULL;
appctx->ctx.stats.flags &= ~PROMEX_FL_INFO_METRIC;
appctx->ctx.stats.flags |= (PROMEX_FL_METRIC_HDR|PROMEX_FL_FRONT_METRIC);
appctx->ctx.stats.st_code = 0;
appctx->st2 = ST_F_PXNAME;
appctx->st1 = PROMEX_DUMPER_FRONT;
/* fall through */
@ -1042,6 +1045,7 @@ static int promex_dump_metrics(struct appctx *appctx, struct stream_interface *s
appctx->ctx.stats.obj2 = NULL;
appctx->ctx.stats.flags &= ~PROMEX_FL_FRONT_METRIC;
appctx->ctx.stats.flags |= (PROMEX_FL_METRIC_HDR|PROMEX_FL_BACK_METRIC);
appctx->ctx.stats.st_code = 0;
appctx->st2 = ST_F_PXNAME;
appctx->st1 = PROMEX_DUMPER_BACK;
/* fall through */
@ -1060,6 +1064,7 @@ static int promex_dump_metrics(struct appctx *appctx, struct stream_interface *s
appctx->ctx.stats.obj2 = (appctx->ctx.stats.obj1 ? ((struct proxy *)appctx->ctx.stats.obj1)->srv : NULL);
appctx->ctx.stats.flags &= ~PROMEX_FL_BACK_METRIC;
appctx->ctx.stats.flags |= (PROMEX_FL_METRIC_HDR|PROMEX_FL_SRV_METRIC);
appctx->ctx.stats.st_code = 0;
appctx->st2 = ST_F_PXNAME;
appctx->st1 = PROMEX_DUMPER_SRV;
/* fall through */