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Add a hook for processing messages due to be sent to the server log.

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Use-cases for this include custom log filtering rules and custom log
message transmission mechanisms (for instance, lossy log message
collection, which has been discussed several times recently).

As is our common practice for hooks, there's no regression test nor
user-facing documentation for this, though the author did exhibit a
sample module using the hook.

Martin Pihlak, reviewed by Marti Raudsepp
This commit is contained in:
Tom Lane
2012-03-06 15:35:41 -05:00
parent bc97c38115
commit 19dbc34631
2 changed files with 30 additions and 0 deletions
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4
src/include/utils/elog.h
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@ -334,6 +334,10 @@ extern void FlushErrorState(void);
extern void ReThrowError(ErrorData *edata);
extern void pg_re_throw(void) __attribute__((noreturn));
/* Hook for intercepting messages before they are sent to the server log */
typedef void (*emit_log_hook_type) (ErrorData *edata);
extern PGDLLIMPORT emit_log_hook_type emit_log_hook;
/* GUC-configurable parameters */