feat: proactively probe database on Auto-IAM refresh to update MCP tokens - #1150
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hessjcg wants to merge 2 commits into
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feat: proactively probe database on Auto-IAM refresh to update MCP tokens#1150hessjcg wants to merge 2 commits into
hessjcg wants to merge 2 commits into
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Code review comments addressed: - Respect the IP settings in connection configuration (WithRefreshAheadIPType / connectionType) rather than probing all available IPs - Use configured refreshTimeout for probe context timeout
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Fixes GoogleCloudPlatform/cloud-sql-proxy#2553
When connecting to Cloud SQL for PostgreSQL with Managed Connection Pooling (MCP) enabled, the server-side MCP caches the IAM OAuth2 access token passed during connection establishment. Because IAM tokens expire after 1 hour, pooled backend sessions retain stale tokens and cause intermittent authentication failures (SQLSTATE 08P01).
This change adds a proactive connection test / probe during the background credential refresh cycle when Auto-IAM authentication is enabled. Immediately following a successful certificate refresh, the connector opens a TCP socket to the instance (port 3307), performs the TLS handshake to propagate the newly minted IAM token to the server's MCP daemon, and immediately closes the socket.