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Support frontend-backend protocol communication using a shm_mq.

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A background worker can use pq_redirect_to_shm_mq() to direct protocol
that would normally be sent to the frontend to a shm_mq so that another
process may read them.

The receiving process may use pq_parse_errornotice() to parse an
ErrorResponse or NoticeResponse from the background worker and, if
it wishes, ThrowErrorData() to propagate the error (with or without
further modification).

Patch by me.  Review by Andres Freund.
This commit is contained in:
Robert Haas
2014-10-31 12:02:40 -04:00
parent 252e652ede
commit 2bd9e412f9
9 changed files with 428 additions and 47 deletions
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51
src/backend/utils/error/elog.c
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@@ -1576,6 +1576,57 @@ FlushErrorState(void)
MemoryContextResetAndDeleteChildren(ErrorContext);
}
/*
* ThrowErrorData --- report an error described by an ErrorData structure
*
* This is intended to be used to re-report errors originally thrown by
* background worker processes and then propagated (with or without
* modification) to the backend responsible for them.
*/
void
ThrowErrorData(ErrorData *edata)
{
ErrorData *newedata;
MemoryContext oldcontext;
if (!errstart(edata->elevel, edata->filename, edata->lineno,
edata->funcname, NULL))
return;
newedata = &errordata[errordata_stack_depth];
oldcontext = MemoryContextSwitchTo(edata->assoc_context);
/* Copy the supplied fields to the error stack. */
if (edata->sqlerrcode > 0)
newedata->sqlerrcode = edata->sqlerrcode;
if (edata->message)
newedata->message = pstrdup(edata->message);
if (edata->detail)
newedata->detail = pstrdup(edata->detail);
if (edata->detail_log)
newedata->detail_log = pstrdup(edata->detail_log);
if (edata->hint)
newedata->hint = pstrdup(edata->hint);
if (edata->context)
newedata->context = pstrdup(edata->context);
if (edata->schema_name)
newedata->schema_name = pstrdup(edata->schema_name);
if (edata->table_name)
newedata->table_name = pstrdup(edata->table_name);
if (edata->column_name)
newedata->column_name = pstrdup(edata->column_name);
if (edata->datatype_name)
newedata->datatype_name = pstrdup(edata->datatype_name);
if (edata->constraint_name)
newedata->constraint_name = pstrdup(edata->constraint_name);
if (edata->internalquery)
newedata->internalquery = pstrdup(edata->internalquery);
MemoryContextSwitchTo(oldcontext);
errfinish(0);
}
/*
* ReThrowError --- re-throw a previously copied error
*