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Make dblink interruptible, via new libpqsrv APIs.

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This replaces dblink's blocking libpq calls, allowing cancellation and
allowing DROP DATABASE (of a database not involved in the query).  Apart
from explicit dblink_cancel_query() calls, dblink still doesn't cancel
the remote side.  The replacement for the blocking calls consists of
new, general-purpose query execution wrappers in the libpqsrv facility.
Out-of-tree extensions should adopt these.  Use them in postgres_fdw,
replacing a local implementation from which the libpqsrv implementation
derives.  This is a bug fix for dblink.  Code inspection identified the
bug at least thirteen years ago, but user complaints have not appeared.
Hence, no back-patch for now.

Discussion: https://postgr.es/m/20231122012945.74@rfd.leadboat.com
This commit is contained in:
Noah Misch
2024-01-08 11:39:56 -08:00
parent 0efc831847
commit d3c5f37dd5
8 changed files with 180 additions and 95 deletions
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9
doc/src/sgml/dblink.sgml
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@ -37,6 +37,15 @@
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>DblinkGetResult</literal></term>
<listitem>
<para>
Waiting to receive the results of a query from a remote server.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>