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Add usename and application_name to pg_locks_count #1008

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Add usename and application_name to pg_locks_count #1008

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28 changes: 17 additions & 11 deletions collector/pg_locks.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,13 +45,15 @@ var (
"count",
),
"Number of locks",
[]string{"datname", "mode"}, nil,
[]string{"datname", "mode", "usename", "application_name"}, nil,
)

pgLocksQuery = `
SELECT
pg_database.datname as datname,
tmp.mode as mode,
COALESCE(usename, ''),
COALESCE(application_name, ''),
COALESCE(count, 0) as count
FROM
(
Expand All @@ -71,14 +73,18 @@ var (
SELECT
database,
lower(mode) AS mode,
count(*) AS count
FROM
pg_locks
count(*) AS count,
usename,
application_name
FROM
pg_locks l JOIN pg_stat_activity a ON a.pid = l.pid
WHERE
database IS NOT NULL
GROUP BY
database,
lower(mode)
GROUP BY
database,
lower(mode),
usename,
application_name
) AS tmp2 ON tmp.mode = tmp2.mode
and pg_database.oid = tmp2.database
ORDER BY
Expand All @@ -99,15 +105,15 @@ func (c PGLocksCollector) Update(ctx context.Context, instance *instance, ch cha
}
defer rows.Close()

var datname, mode sql.NullString
var datname, mode, usename, applicationName sql.NullString
var count sql.NullInt64

for rows.Next() {
if err := rows.Scan(&datname, &mode, &count); err != nil {
if err := rows.Scan(&datname, &mode, &usename, &applicationName, &count); err != nil {
return err
}

if !datname.Valid || !mode.Valid {
if !datname.Valid || !mode.Valid || !usename.Valid || !applicationName.Valid {
continue
}

Expand All @@ -119,7 +125,7 @@ func (c PGLocksCollector) Update(ctx context.Context, instance *instance, ch cha
ch <- prometheus.MustNewConstMetric(
pgLocksDesc,
prometheus.GaugeValue, countMetric,
datname.String, mode.String,
datname.String, mode.String, usename.String, applicationName.String,
)
}
if err := rows.Err(); err != nil {
Expand Down
8 changes: 5 additions & 3 deletions collector/pg_locks_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,9 @@ func TestPGLocksCollector(t *testing.T) {

inst := &instance{db: db}

rows := sqlmock.NewRows([]string{"datname", "mode", "count"}).
AddRow("test", "exclusivelock", 42)
rows := sqlmock.NewRows([]string{"datname", "mode", "usename", "application_name", "count"}).
AddRow("test", "exclusivelock", "", "", 42).
AddRow("test2", "exclusivelock", "myaccount", "myapp", 21)

mock.ExpectQuery(sanitizeQuery(pgLocksQuery)).WillReturnRows(rows)

Expand All @@ -46,7 +47,8 @@ func TestPGLocksCollector(t *testing.T) {
}()

expected := []MetricResult{
{labels: labelMap{"datname": "test", "mode": "exclusivelock"}, value: 42, metricType: dto.MetricType_GAUGE},
{labels: labelMap{"datname": "test", "mode": "exclusivelock", "usename": "", "application_name": ""}, value: 42, metricType: dto.MetricType_GAUGE},
{labels: labelMap{"datname": "test2", "mode": "exclusivelock", "usename": "myaccount", "application_name": "myapp"}, value: 21, metricType: dto.MetricType_GAUGE},
}
convey.Convey("Metrics comparison", t, func() {
for _, expect := range expected {
Expand Down