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Revise the API for GUC variable assign hooks.

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The previous functions of assign hooks are now split between check hooks
and assign hooks, where the former can fail but the latter shouldn't.
Aside from being conceptually clearer, this approach exposes the
"canonicalized" form of the variable value to guc.c without having to do
an actual assignment.  And that lets us fix the problem recently noted by
Bernd Helmle that the auto-tune patch for wal_buffers resulted in bogus
log messages about "parameter "wal_buffers" cannot be changed without
restarting the server".  There may be some speed advantage too, because
this design lets hook functions avoid re-parsing variable values when
restoring a previous state after a rollback (they can store a pre-parsed
representation of the value instead).  This patch also resolves a
longstanding annoyance about custom error messages from variable assign
hooks: they should modify, not appear separately from, guc.c's own message
about "invalid parameter value".
This commit is contained in:
Tom Lane
2011-04-07 00:11:01 -04:00
parent 5d0e462366
commit 2594cf0e8c
35 changed files with 2645 additions and 1888 deletions
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9
src/include/utils/elog.h
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@ -200,6 +200,15 @@ elog_finish(int elevel, const char *fmt,...)
__attribute__((format(printf, 2, 3)));
/* Support for constructing error strings separately from ereport() calls */
extern void pre_format_elog_string(int errnumber, const char *domain);
extern char *format_elog_string(const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
the supplied arguments. */
__attribute__((format(printf, 1, 2)));
/* Support for attaching context information to error reports */
typedef struct ErrorContextCallback