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Pretty-print values in the PCP DynamicMeter code

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Several improvements to the way values are displayed in the
PCP platform DynamicMeter implementation:
- handle the initial 'caption' setting as with regular meters,
  this required a new meter callback because we no longer have
  just a single meter caption for the DynamicMeter case
- if no label is provided for a metric in a configuration file
  use the short form metric name as a fallback
- honour the suffix setting in the configuration file
- convert metric values to the canonical units for htop (kbyte
  and seconds), and use Meter_humanUnit when it makes sense to
  do so.

Also improves the handling of fatal string error messages in a
couple of places, thanks to BenBE for the review feedback.
This commit is contained in:
Nathan Scott
2021-07-07 16:57:03 +10:00
parent 149774209b
commit 01f5b89278
8 changed files with 129 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

137
pcp/PCPDynamicMeter.c
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@ -42,6 +42,7 @@ static PCPDynamicMetric* PCPDynamicMeter_lookupMetric(PCPDynamicMeters* meters,
metric = &meter->metrics[n-1];
memset(metric, 0, sizeof(PCPDynamicMetric));
metric->name = metricName;
metric->label = String_cat(name, ": ");
metric->id = meters->offset + meters->cursor;
meters->cursor++;
@ -65,13 +66,14 @@ static void PCPDynamicMeter_parseMetric(PCPDynamicMeters* meters, PCPDynamicMete
/* use derived metrics in dynamic meters for simplicity */
char* error;
if (pmRegisterDerivedMetric(metric->name, value, &error) < 0) {
char note[1024];
xSnprintf(note, sizeof(note),
"failed to parse expression in %s at line %u\n%s\n%s",
path, line, error, pmGetProgname());
char* note;
xAsprintf(&note,
"%s: failed to parse expression in %s at line %u\n%s\n",
pmGetProgname(), path, line, error);
free(error);
errno = EINVAL;
CRT_fatalError(note);
free(note);
}
} else {
/* this is a property of a dynamic metric - the metric expression */
@ -97,7 +99,9 @@ static void PCPDynamicMeter_parseMetric(PCPDynamicMeters* meters, PCPDynamicMete
else if (String_eq(value, "white"))
metric->color = DYNAMIC_WHITE;
} else if (String_eq(p, "label")) {
free_and_xStrdup(&metric->label, value);
char* label = String_cat(value, ": ");
free_and_xStrdup(&metric->label, label);
free(label);
} else if (String_eq(p, "suffix")) {
free_and_xStrdup(&metric->suffix, value);
}
@ -112,12 +116,13 @@ static void PCPDynamicMeter_validateMeterName(char* key, const char *path, unsig
if (end) {
*end = '\0';
} else {
char note[1024];
xSnprintf(note, sizeof(note),
"No closing brace on meter name at %s line %u\n\"%s\"",
path, line, key);
char* note;
xAsprintf(&note,
"%s: no closing brace on meter name at %s line %u\n\"%s\"",
pmGetProgname(), path, line, key);
errno = EINVAL;
CRT_fatalError(note);
free(note);
}
while (*p) {
@ -131,12 +136,13 @@ static void PCPDynamicMeter_validateMeterName(char* key, const char *path, unsig
p++;
}
if (*p != '\0') { /* badness */
char note[1024];
xSnprintf(note, sizeof(note),
"Invalid meter name at %s line %u\n\"%s\"",
path, line, key);
char* note;
xAsprintf(&note,
"%s: invalid meter name at %s line %u\n\"%s\"",
pmGetProgname(), path, line, key);
errno = EINVAL;
CRT_fatalError(note);
free(note);
} else { /* overwrite closing brace */
*p = '\0';
}
@ -182,7 +188,9 @@ static void PCPDynamicMeter_parseFile(PCPDynamicMeters* meters, const char* path
PCPDynamicMeter_validateMeterName(key+1, path, lineno);
meter = PCPDynamicMeter_new(meters, key+1);
} else if (value && String_eq(key, "caption")) {
free_and_xStrdup(&meter->super.caption, value);
char* caption = String_cat(value, ": ");
free_and_xStrdup(&meter->super.caption, caption);
free(caption);
} else if (value && String_eq(key, "description")) {
free_and_xStrdup(&meter->super.description, value);
} else if (value && String_eq(key, "type")) {
@ -272,39 +280,66 @@ void PCPDynamicMeter_updateValues(PCPDynamicMeter* this, Meter* meter) {
PCPDynamicMetric* metric = &this->metrics[i];
const pmDesc* desc = Metric_desc(metric->id);
pmAtomValue atom;
pmAtomValue atom, raw;
if (!Metric_values(metric->id, &atom, 1, desc->type)) {
if (!Metric_values(metric->id, &raw, 1, desc->type)) {
bytes--; /* clear the separator */
continue;
}
/* TODO: pretty-print the values - pmConvScale, etc */
pmUnits conv = desc->units; /* convert to canonical units */
if (conv.dimSpace)
conv.scaleSpace = PM_SPACE_KBYTE;
if (conv.dimTime)
conv.scaleTime = PM_TIME_SEC;
if (desc->type == PM_TYPE_STRING)
atom = raw;
else if (pmConvScale(desc->type, &raw, &desc->units, &atom, &conv) < 0) {
bytes--; /* clear the separator */
continue;
}
size_t saved = bytes;
switch (desc->type) {
case PM_TYPE_STRING:
bytes += xSnprintf(buffer + bytes, size - bytes, "%s", atom.cp);
free(atom.cp);
break;
case PM_TYPE_32:
bytes += xSnprintf(buffer + bytes, size - bytes, "%d", atom.l);
bytes += conv.dimSpace ?
Meter_humanUnit(buffer + bytes, atom.l, size - bytes) :
xSnprintf(buffer + bytes, size - bytes, "%d", atom.l);
break;
case PM_TYPE_U32:
bytes += xSnprintf(buffer + bytes, size - bytes, "%u", atom.ul);
bytes += conv.dimSpace ?
Meter_humanUnit(buffer + bytes, atom.ul, size - bytes) :
xSnprintf(buffer + bytes, size - bytes, "%u", atom.ul);
break;
case PM_TYPE_64:
bytes += xSnprintf(buffer + bytes, size - bytes, "%lld", (long long) atom.ll);
bytes += conv.dimSpace ?
Meter_humanUnit(buffer + bytes, atom.ll, size - bytes) :
xSnprintf(buffer + bytes, size - bytes, "%lld", (long long) atom.ll);
break;
case PM_TYPE_U64:
bytes += xSnprintf(buffer + bytes, size - bytes, "%llu", (unsigned long long) atom.ull);
bytes += conv.dimSpace ?
Meter_humanUnit(buffer + bytes, atom.ull, size - bytes) :
xSnprintf(buffer + bytes, size - bytes, "%llu", (unsigned long long) atom.ull);
break;
case PM_TYPE_FLOAT:
bytes += xSnprintf(buffer + bytes, size - bytes, "%f", (double) atom.f);
bytes += conv.dimSpace ?
Meter_humanUnit(buffer + bytes, atom.f, size - bytes) :
xSnprintf(buffer + bytes, size - bytes, "%.2f", (double) atom.f);
break;
case PM_TYPE_DOUBLE:
bytes += xSnprintf(buffer + bytes, size - bytes, "%f", atom.d);
bytes += conv.dimSpace ?
Meter_humanUnit(buffer + bytes, atom.d, size - bytes) :
xSnprintf(buffer + bytes, size - bytes, "%.2f", atom.d);
break;
default:
break;
}
if (saved != bytes && metric->suffix)
bytes += xSnprintf(buffer + bytes, size - bytes, "%s", metric->suffix);
}
if (!bytes)
xSnprintf(buffer, size, "no data");
@ -316,52 +351,74 @@ void PCPDynamicMeter_display(PCPDynamicMeter* this, ATTR_UNUSED const Meter* met
for (unsigned int i = 0; i < this->totalMetrics; i++) {
PCPDynamicMetric* metric = &this->metrics[i];
const pmDesc* desc = Metric_desc(metric->id);
pmAtomValue atom;
pmAtomValue atom, raw;
char buffer[64];
int len;
if (!Metric_values(metric->id, &atom, 1, desc->type))
if (!Metric_values(metric->id, &raw, 1, desc->type))
continue;
nodata = 0;
pmUnits conv = desc->units; /* convert to canonical units */
if (conv.dimSpace)
conv.scaleSpace = PM_SPACE_KBYTE;
if (conv.dimTime)
conv.scaleTime = PM_TIME_SEC;
if (desc->type == PM_TYPE_STRING)
atom = raw;
else if (pmConvScale(desc->type, &raw, &desc->units, &atom, &conv) < 0)
continue;
nodata = 0; /* we will use this metric so *some* data will be added */
if (i > 0)
RichString_appendnAscii(out, CRT_colors[metric->color], " ", 1);
if (metric->label) {
len = xSnprintf(buffer, sizeof(buffer), "%s ", metric->label);
RichString_appendnAscii(out, CRT_colors[METER_TEXT], buffer, len);
}
if (metric->label)
RichString_appendAscii(out, CRT_colors[METER_TEXT], metric->label);
/* TODO: pretty-print the values - pmConvScale, etc */
len = 0;
int len = 0;
switch (desc->type) {
case PM_TYPE_STRING:
len = xSnprintf(buffer, sizeof(buffer), "%s", atom.cp);
free(atom.cp);
break;
case PM_TYPE_32:
len = xSnprintf(buffer, sizeof(buffer), "%d", atom.l);
len = conv.dimSpace ?
Meter_humanUnit(buffer, atom.l, sizeof(buffer)) :
xSnprintf(buffer, sizeof(buffer), "%d", atom.l);
break;
case PM_TYPE_U32:
len = xSnprintf(buffer, sizeof(buffer), "%u", atom.ul);
len = conv.dimSpace ?
Meter_humanUnit(buffer, atom.ul, sizeof(buffer)) :
xSnprintf(buffer, sizeof(buffer), "%u", atom.ul);
break;
case PM_TYPE_64:
len = xSnprintf(buffer, sizeof(buffer), "%lld", (long long) atom.ll);
len = conv.dimSpace ?
Meter_humanUnit(buffer, atom.ll, sizeof(buffer)) :
xSnprintf(buffer, sizeof(buffer), "%lld", (long long) atom.ll);
break;
case PM_TYPE_U64:
len = xSnprintf(buffer, sizeof(buffer), "%llu", (unsigned long long) atom.ull);
len = conv.dimSpace ?
Meter_humanUnit(buffer, atom.ull, sizeof(buffer)) :
xSnprintf(buffer, sizeof(buffer), "%llu", (unsigned long long) atom.ull);
break;
case PM_TYPE_FLOAT:
len = xSnprintf(buffer, sizeof(buffer), "%f", (double)atom.f);
len = conv.dimSpace ?
Meter_humanUnit(buffer, atom.f, sizeof(buffer)) :
xSnprintf(buffer, sizeof(buffer), "%.2f", (double) atom.f);
break;
case PM_TYPE_DOUBLE:
len = xSnprintf(buffer, sizeof(buffer), "%f", atom.d);
len = conv.dimSpace ?
Meter_humanUnit(buffer, atom.d, sizeof(buffer)) :
xSnprintf(buffer, sizeof(buffer), "%.2f", atom.d);
break;
default:
break;
}
if (len)
if (len) {
RichString_appendnAscii(out, CRT_colors[metric->color], buffer, len);
if (metric->suffix)
RichString_appendAscii(out, CRT_colors[METER_TEXT], metric->suffix);
}
}
if (nodata)
RichString_writeAscii(out, CRT_colors[METER_VALUE_ERROR], "no data");