Forward libpq TCP keepalive / tcp_user_timeout parameters in the PostgreSQL drivers - #7409
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Forward libpq TCP keepalive / tcp_user_timeout parameters in the PostgreSQL drivers#7409benconda wants to merge 1 commit into
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…drivers Add support for the libpq connection keywords keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout and connect_timeout in both the pdo_pgsql and pgsql drivers, in the same style as the existing ssl* keywords. These bound how long a connection can block when a TCP session is silently dropped, which otherwise hangs until the kernel exhausts net.ipv4.tcp_retries2 (~15 min by default). Refs doctrine#7408
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Fixes #7408.
Summary
The PostgreSQL drivers build their connection string from a fixed whitelist of parameters and silently drop everything else, so libpq's TCP-resilience keywords cannot be configured through DBAL today. This adds support for:
keepaliveskeepalives_idlekeepalives_intervalkeepalives_counttcp_user_timeoutconnect_timeoutin both PostgreSQL drivers, in the same explicit style already used for the
ssl*/gssencmodekeywords.Why
When a TCP connection to PostgreSQL is silently cut mid-query (flaky inter-DC link, stateful firewall dropping an idle entry, LB reset without RST), the PHP process blocks in libpq's
recv()until the kernel gives up — with the Linux defaultnet.ipv4.tcp_retries2 = 15that is ~15 minutes per stuck request, which can exhaust the worker/FPM pool. These libpq keywords bound dead-peer detection to a few seconds, but there was previously no way to set them via DBAL. See #7408 for the full context (real-world incident + measurements).Changes
Driver\PDO\PgSQL\Driver::constructPdoDsn()— append the keywords to the PDO DSN.Driver\PgSQL\Driver::constructConnectionString()— add the keywords to the nativepg_connectconnection string.Verification
phpcs(Doctrine CS) andphpstanpass on the changed files.pgsql:host=...;...;keepalives=1;keepalives_idle=10;keepalives_interval=5;keepalives_count=3;tcp_user_timeout=15000;connect_timeout=5;Notes
4.4.x; glad to retarget to whichever branch you prefer for a feature.