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e9c27a5fb7
* Add aurora_stat_logical_wal_cache collector for Amazon Aurora PostgreSQL Expose WAL cache hits, misses and read requests of each logical replication slot from aurora_stat_logical_wal_cache(). The function only exists in Aurora PostgreSQL 11.17+, 12.12+, 13.8+, 14.7+ and 15.2+. Checking for Aurora alone would make the collector fail on every scrape on older versions, so it first checks that the function exists with to_regproc, the same way Aurora itself is detected, and returns no data when it doesn't. The check is a small helper that other version-dependent Aurora collectors can reuse. The collector is disabled by default and returns no data on non-Aurora servers. Aurora collector names get their own block in config.go, so gofmt does not realign the main list when longer names are added. Signed-off-by: Pavel K <megativ3@gmail.com> * collector: rename auroraFunctionExists to functionExists The helper isn't Aurora specific, so it could be used by collectors for other types of instances as well. Signed-off-by: Pavel K <megativ3@gmail.com> --------- Signed-off-by: Pavel K <megativ3@gmail.com>
51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
// Copyright The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"context"
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"testing"
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"github.com/DATA-DOG/go-sqlmock"
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)
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func expectFunctionExists(mock sqlmock.Sqlmock, name string, exists bool) {
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mock.ExpectQuery(sanitizeQuery(functionExistsQuery)).
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WithArgs(name).
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WillReturnRows(sqlmock.NewRows([]string{"exists"}).AddRow(exists))
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}
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func TestFunctionExists(t *testing.T) {
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for _, exists := range []bool{true, false} {
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db, mock, err := sqlmock.New()
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if err != nil {
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t.Fatalf("Error opening a stub db connection: %s", err)
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}
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expectFunctionExists(mock, "aurora_stat_logical_wal_cache", exists)
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got, err := functionExists(context.Background(), db, "aurora_stat_logical_wal_cache")
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if err != nil {
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t.Errorf("Error calling functionExists: %s", err)
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}
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if got != exists {
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t.Errorf("Expected %v, got %v", exists, got)
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}
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if err := mock.ExpectationsWereMet(); err != nil {
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t.Errorf("there were unfulfilled exceptions: %s", err)
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}
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db.Close()
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}
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}
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