feat(outputs.postgresql): Add secret store support

plugins/outputs/postgresql/README.md

@@ -12,6 +12,14 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
 
 [CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
 
+## Secret-store support
+
+This plugin supports secrets from secret-stores for the `connection` option.
+See the [secret-store documentation][SECRETSTORE] for more details on how
+to use them.
+
+[SECRETSTORE]: ../../../docs/CONFIGURATION.md#secret-store-secrets
+
 ## Configuration
 
 ```toml @sample.conf

plugins/outputs/postgresql/postgresql.go

@@ -34,7 +34,7 @@ type dbh interface {
 var sampleConfig string
 
 type Postgresql struct {
-	Connection                 string                  `toml:"connection"`
+	Connection                 config.Secret           `toml:"connection"`
 	Schema                     string                  `toml:"schema"`
 	TagsAsForeignKeys          bool                    `toml:"tags_as_foreign_keys"`
 	TagTableSuffix             string                  `toml:"tag_table_suffix"`
@@ -130,11 +130,17 @@ func (p *Postgresql) Init() error {
 	p.fieldsJSONColumn = utils.Column{Name: "fields", Type: PgJSONb, Role: utils.FieldColType}
 	p.tagsJSONColumn = utils.Column{Name: "tags", Type: PgJSONb, Role: utils.TagColType}
 
-	var err error
-	if p.dbConfig, err = pgxpool.ParseConfig(p.Connection); err != nil {
+	connectionSecret, err := p.Connection.Get()
+	if err != nil {
+		return fmt.Errorf("getting address failed: %w", err)
+	}
+	connection := connectionSecret.String()
+	defer connectionSecret.Destroy()
+
+	if p.dbConfig, err = pgxpool.ParseConfig(connection); err != nil {
 		return err
 	}
-	parsedConfig, _ := pgx.ParseConfig(p.Connection)
+	parsedConfig, _ := pgx.ParseConfig(connection)
 	if _, ok := parsedConfig.Config.RuntimeParams["pool_max_conns"]; !ok {
 		// The pgx default for pool_max_conns is 4. However we want to default to 1.
 		p.dbConfig.MaxConns = 1

plugins/outputs/postgresql/postgresql_bench_test.go

@@ -9,7 +9,9 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/metric"
+	"github.com/stretchr/testify/require"
 )
 
 func BenchmarkPostgresql_sequential(b *testing.B) {
@@ -23,7 +25,12 @@ func BenchmarkPostgresql_concurrent(b *testing.B) {
 
 func benchmarkPostgresql(b *testing.B, gen <-chan []telegraf.Metric, concurrency int, foreignTags bool) {
 	p := newPostgresqlTest(b)
-	p.Connection += fmt.Sprintf(" pool_max_conns=%d", concurrency)
+
+	connection, err := p.Connection.Get()
+	require.NoError(b, err)
+	p.Connection = config.NewSecret([]byte(connection.String() + fmt.Sprintf(" pool_max_conns=%d", concurrency)))
+	connection.Destroy()
+
 	p.TagsAsForeignKeys = foreignTags
 	p.LogLevel = ""
 	_ = p.Init()

plugins/outputs/postgresql/postgresql_test.go

@@ -17,6 +17,7 @@ import (
 	"github.com/testcontainers/testcontainers-go/wait"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/metric"
 	"github.com/influxdata/telegraf/plugins/outputs/postgresql/utils"
 	"github.com/influxdata/telegraf/testutil"
@@ -231,14 +232,15 @@ func newPostgresqlTest(tb testing.TB) *PostgresqlTest {
 	require.NoError(tb, err, "failed to start container")
 
 	p := newPostgresql()
-	p.Connection = fmt.Sprintf(
+	connection := fmt.Sprintf(
 		"host=%s port=%s user=%s password=%s dbname=%s",
 		container.Address,
 		container.Ports[servicePort],
 		username,
 		password,
 		testDatabaseName,
 	)
+	p.Connection = config.NewSecret([]byte(connection))
 	logger := NewLogAccumulator(tb)
 	p.Logger = logger
 	p.LogLevel = "debug"
@@ -260,7 +262,11 @@ func TestPostgresqlConnectIntegration(t *testing.T) {
 	require.EqualValues(t, 1, p.db.Stat().MaxConns())
 
 	p = newPostgresqlTest(t)
-	p.Connection += " pool_max_conns=2"
+	connection, err := p.Connection.Get()
+	require.NoError(t, err)
+	p.Connection = config.NewSecret([]byte(connection.String() + " pool_max_conns=2"))
+	connection.Destroy()
+
 	_ = p.Init()
 	require.NoError(t, p.Connect())
 	require.EqualValues(t, 2, p.db.Stat().MaxConns())