prometheus/postgres_exporter
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Add the instance struct to handle connections

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The intent is to use the instance struct to hold the connection to the database as well as metadata about the instance. Currently this metadata only includes the version of postgres for the instance which can be used in the collectors to decide what query to run. In the future this could hold more metadata but for now it keeps the Collector interface arguments to a reasonable number.

Signed-off-by: Joe Adams <github@joeadams.io>
This commit is contained in:
Joe Adams
2023-03-29 21:25:27 -04:00
parent 5db7cfba22
commit ab33346cbd
19 changed files with 139 additions and 44 deletions
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4
collector/pg_database.go
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@ -15,7 +15,6 @@ package collector
import (
"context"
"database/sql"
"github.com/go-kit/log"
"github.com/prometheus/client_golang/prometheus"
@ -66,7 +65,8 @@ var (
// each database individually. This is because we can't filter the
// list of databases in the query because the list of excluded
// databases is dynamic.
func (c PGDatabaseCollector) Update(ctx context.Context, db *sql.DB, ch chan<- prometheus.Metric) error {
func (c PGDatabaseCollector) Update(ctx context.Context, instance *instance, ch chan<- prometheus.Metric) error {
db := instance.getDB()
// Query the list of databases
rows, err := db.QueryContext(ctx,
pgDatabaseQuery,