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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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16
src/include/utils/pg_locale.h
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@@ -33,14 +33,14 @@ extern char *localized_abbrev_months[];
extern char *localized_full_months[];
extern const char *locale_messages_assign(const char *value,
bool doit, GucSource source);
extern const char *locale_monetary_assign(const char *value,
bool doit, GucSource source);
extern const char *locale_numeric_assign(const char *value,
bool doit, GucSource source);
extern const char *locale_time_assign(const char *value,
bool doit, GucSource source);
extern bool check_locale_messages(char **newval, void **extra, GucSource source);
extern void assign_locale_messages(const char *newval, void *extra);
extern bool check_locale_monetary(char **newval, void **extra, GucSource source);
extern void assign_locale_monetary(const char *newval, void *extra);
extern bool check_locale_numeric(char **newval, void **extra, GucSource source);
extern void assign_locale_numeric(const char *newval, void *extra);
extern bool check_locale_time(char **newval, void **extra, GucSource source);
extern void assign_locale_time(const char *newval, void *extra);
extern bool check_locale(int category, const char *locale);
extern char *pg_perm_setlocale(int category, const char *locale);