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-rw-r--r--src/pl/plperl/SPI.xs29
-rw-r--r--src/pl/plperl/plperl.c124
2 files changed, 130 insertions, 23 deletions
diff --git a/src/pl/plperl/SPI.xs b/src/pl/plperl/SPI.xs
index 496e8896a92..8d14f093b72 100644
--- a/src/pl/plperl/SPI.xs
+++ b/src/pl/plperl/SPI.xs
@@ -46,6 +46,33 @@ do_spi_elog(int level, char *message)
PG_END_TRY();
}
+/*
+ * Interface routine to catch ereports and punt them to Perl
+ */
+static void
+do_plperl_return_next(SV *sv)
+{
+ MemoryContext oldcontext = CurrentMemoryContext;
+
+ PG_TRY();
+ {
+ plperl_return_next(sv);
+ }
+ PG_CATCH();
+ {
+ ErrorData *edata;
+
+ /* Must reset elog.c's state */
+ MemoryContextSwitchTo(oldcontext);
+ edata = CopyErrorData();
+ FlushErrorState();
+
+ /* Punt the error to Perl */
+ croak("%s", edata->message);
+ }
+ PG_END_TRY();
+}
+
MODULE = SPI PREFIX = spi_
@@ -101,7 +128,7 @@ void
spi_return_next(rv)
SV *rv;
CODE:
- plperl_return_next(rv);
+ do_plperl_return_next(rv);
SV *
spi_spi_query(query)
diff --git a/src/pl/plperl/plperl.c b/src/pl/plperl/plperl.c
index 5bd2943dd52..01d7b2453b1 100644
--- a/src/pl/plperl/plperl.c
+++ b/src/pl/plperl/plperl.c
@@ -33,7 +33,7 @@
* ENHANCEMENTS, OR MODIFICATIONS.
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.93 2005/10/15 02:49:49 momjian Exp $
+ * $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.94 2005/10/18 17:13:14 tgl Exp $
*
**********************************************************************/
@@ -119,9 +119,6 @@ Datum plperl_call_handler(PG_FUNCTION_ARGS);
Datum plperl_validator(PG_FUNCTION_ARGS);
void plperl_init(void);
-HV *plperl_spi_exec(char *query, int limit);
-SV *plperl_spi_query(char *);
-
static Datum plperl_func_handler(PG_FUNCTION_ARGS);
static Datum plperl_trigger_handler(PG_FUNCTION_ARGS);
@@ -131,8 +128,6 @@ static SV *plperl_hash_from_tuple(HeapTuple tuple, TupleDesc tupdesc);
static void plperl_init_shared_libs(pTHX);
static HV *plperl_spi_execute_fetch_result(SPITupleTable *, int, int);
-void plperl_return_next(SV *);
-
/*
* This routine is a crock, and so is everyplace that calls it. The problem
* is that the cached form of plperl functions/queries is allocated permanently
@@ -1552,8 +1547,16 @@ plperl_spi_execute_fetch_result(SPITupleTable *tuptable, int processed,
}
+/*
+ * Note: plperl_return_next is called both in Postgres and Perl contexts.
+ * We report any errors in Postgres fashion (via ereport). If called in
+ * Perl context, it is SPI.xs's responsibility to catch the error and
+ * convert to a Perl error. We assume (perhaps without adequate justification)
+ * that we need not abort the current transaction if the Perl code traps the
+ * error.
+ */
void
-plperl_return_next(SV * sv)
+plperl_return_next(SV *sv)
{
plperl_proc_desc *prodesc = plperl_current_prodesc;
FunctionCallInfo fcinfo = plperl_current_caller_info;
@@ -1566,20 +1569,16 @@ plperl_return_next(SV * sv)
return;
if (!prodesc->fn_retisset)
- {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("cannot use return_next in a non-SETOF function")));
- }
if (prodesc->fn_retistuple &&
!(SvOK(sv) && SvTYPE(sv) == SVt_RV && SvTYPE(SvRV(sv)) == SVt_PVHV))
- {
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("setof-composite-returning Perl function "
"must call return_next with reference to hash")));
- }
cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory);
@@ -1637,10 +1636,15 @@ plperl_spi_query(char *query)
{
SV *cursor;
+ /*
+ * Execute the query inside a sub-transaction, so we can cope with errors
+ * sanely
+ */
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
BeginInternalSubTransaction(NULL);
+ /* Want to run inside function's memory context */
MemoryContextSwitchTo(oldcontext);
PG_TRY();
@@ -1648,6 +1652,7 @@ plperl_spi_query(char *query)
void *plan;
Portal portal = NULL;
+ /* Create a cursor for the query */
plan = SPI_prepare(query, 0, NULL);
if (plan)
portal = SPI_cursor_open(NULL, plan, NULL, NULL, false);
@@ -1656,25 +1661,42 @@ plperl_spi_query(char *query)
else
cursor = newSV(0);
+ /* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
+
+ /*
+ * AtEOSubXact_SPI() should not have popped any SPI context, but just
+ * in case it did, make sure we remain connected.
+ */
SPI_restore_connection();
}
PG_CATCH();
{
ErrorData *edata;
+ /* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
FlushErrorState();
+ /* Abort the inner transaction */
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
+ /*
+ * If AtEOSubXact_SPI() popped any SPI context of the subxact, it will
+ * have left us in a disconnected state. We need this hack to return
+ * to connected state.
+ */
SPI_restore_connection();
+
+ /* Punt the error to Perl */
croak("%s", edata->message);
+
+ /* Can't get here, but keep compiler quiet */
return NULL;
}
PG_END_TRY();
@@ -1686,22 +1708,80 @@ plperl_spi_query(char *query)
SV *
plperl_spi_fetchrow(char *cursor)
{
- SV *row = newSV(0);
- Portal p = SPI_cursor_find(cursor);
+ SV *row;
+
+ /*
+ * Execute the FETCH inside a sub-transaction, so we can cope with errors
+ * sanely
+ */
+ MemoryContext oldcontext = CurrentMemoryContext;
+ ResourceOwner oldowner = CurrentResourceOwner;
- if (!p)
- return row;
+ BeginInternalSubTransaction(NULL);
+ /* Want to run inside function's memory context */
+ MemoryContextSwitchTo(oldcontext);
- SPI_cursor_fetch(p, true, 1);
- if (SPI_processed == 0)
+ PG_TRY();
{
- SPI_cursor_close(p);
- return row;
+ Portal p = SPI_cursor_find(cursor);
+
+ if (!p)
+ row = newSV(0);
+ else
+ {
+ SPI_cursor_fetch(p, true, 1);
+ if (SPI_processed == 0)
+ {
+ SPI_cursor_close(p);
+ row = newSV(0);
+ }
+ else
+ {
+ row = plperl_hash_from_tuple(SPI_tuptable->vals[0],
+ SPI_tuptable->tupdesc);
+ }
+ SPI_freetuptable(SPI_tuptable);
+ }
+
+ /* Commit the inner transaction, return to outer xact context */
+ ReleaseCurrentSubTransaction();
+ MemoryContextSwitchTo(oldcontext);
+ CurrentResourceOwner = oldowner;
+
+ /*
+ * AtEOSubXact_SPI() should not have popped any SPI context, but just
+ * in case it did, make sure we remain connected.
+ */
+ SPI_restore_connection();
}
+ PG_CATCH();
+ {
+ ErrorData *edata;
- row = plperl_hash_from_tuple(SPI_tuptable->vals[0],
- SPI_tuptable->tupdesc);
- SPI_freetuptable(SPI_tuptable);
+ /* Save error info */
+ MemoryContextSwitchTo(oldcontext);
+ edata = CopyErrorData();
+ FlushErrorState();
+
+ /* Abort the inner transaction */
+ RollbackAndReleaseCurrentSubTransaction();
+ MemoryContextSwitchTo(oldcontext);
+ CurrentResourceOwner = oldowner;
+
+ /*
+ * If AtEOSubXact_SPI() popped any SPI context of the subxact, it will
+ * have left us in a disconnected state. We need this hack to return
+ * to connected state.
+ */
+ SPI_restore_connection();
+
+ /* Punt the error to Perl */
+ croak("%s", edata->message);
+
+ /* Can't get here, but keep compiler quiet */
+ return NULL;
+ }
+ PG_END_TRY();
return row;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-31 17:58:20 +0000