mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-01 05:27:24 +08:00
116 lines
2.9 KiB
Go
116 lines
2.9 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package database
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"github.com/gravitational/trace"
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"github.com/jackc/pgconn"
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"github.com/jackc/pgerrcode"
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"github.com/sirupsen/logrus"
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"github.com/gravitational/teleport/lib/defaults"
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)
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const (
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// A simple query to execute when running the Ping request
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selectOneQuery = "select 1;"
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)
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// PostgresPinger implements the DatabasePinger interface for the Postgres protocol
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type PostgresPinger struct{}
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// Ping connects to the database and issues a basic select statement to validate the connection.
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func (p *PostgresPinger) Ping(ctx context.Context, params PingParams) error {
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if err := params.CheckAndSetDefaults(defaults.ProtocolPostgres); err != nil {
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return trace.Wrap(err)
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}
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pgconnConfig, err := pgconn.ParseConfig(
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fmt.Sprintf("postgres://%s@%s:%d/%s",
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params.Username,
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params.Host,
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params.Port,
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params.DatabaseName,
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),
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)
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if err != nil {
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return trace.Wrap(err)
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}
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conn, err := pgconn.ConnectConfig(ctx, pgconnConfig)
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if err != nil {
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return trace.Wrap(err)
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}
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defer func() {
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if err := conn.Close(ctx); err != nil {
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logrus.WithError(err).Info("failed to close connection in PostgresPinger.Ping")
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}
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}()
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result, err := conn.Exec(ctx, selectOneQuery).ReadAll()
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if err != nil {
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return trace.Wrap(err)
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}
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if len(result) != 1 {
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return trace.BadParameter("unexpected length for result: %+v", result)
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}
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return nil
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}
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// IsConnectionRefusedError checks whether the error is of type connection refused.
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func (p *PostgresPinger) IsConnectionRefusedError(err error) bool {
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if err == nil {
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return false
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}
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return strings.Contains(err.Error(), "connection refused (SQLSTATE")
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}
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// IsInvalidDatabaseUserError checks whether the error is of type invalid database user.
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// This can happen when the user doesn't exist.
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func (p *PostgresPinger) IsInvalidDatabaseUserError(err error) bool {
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var pge *pgconn.PgError
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if errors.As(err, &pge) {
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if pge.SQLState() == pgerrcode.InvalidAuthorizationSpecification {
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return true
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}
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}
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return false
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}
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// IsInvalidDatabaseNameError checks whether the error is of type invalid database name.
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// This can happen when the database doesn't exist.
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func (p *PostgresPinger) IsInvalidDatabaseNameError(err error) bool {
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var pge *pgconn.PgError
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if errors.As(err, &pge) {
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if pge.SQLState() == pgerrcode.InvalidCatalogName {
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return true
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}
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}
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return false
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}
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