From 15f55cc38a82dfa3d7898a7c30a303b1b3e87dc3 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut
Date: Tue, 1 Feb 2011 22:53:40 +0200
Subject: Add validator to PL/Python

Jan Urbański, reviewed by Hitoshi Harada
---
 src/pl/plpython/plpython.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'src/pl/plpython/plpython.c')

diff --git a/src/pl/plpython/plpython.c b/src/pl/plpython/plpython.c
index aafe556c04e..fbfeb2c9f16 100644
--- a/src/pl/plpython/plpython.c
+++ b/src/pl/plpython/plpython.c
@@ -251,15 +251,18 @@ typedef struct PLyResultObject
 
 #if PY_MAJOR_VERSION >= 3
 /* Use separate names to avoid clash in pg_pltemplate */
+#define plpython_validator plpython3_validator
 #define plpython_call_handler plpython3_call_handler
 #define plpython_inline_handler plpython3_inline_handler
 #endif
 
 /* exported functions */
+Datum		plpython_validator(PG_FUNCTION_ARGS);
 Datum		plpython_call_handler(PG_FUNCTION_ARGS);
 Datum		plpython_inline_handler(PG_FUNCTION_ARGS);
 void		_PG_init(void);
 
+PG_FUNCTION_INFO_V1(plpython_validator);
 PG_FUNCTION_INFO_V1(plpython_call_handler);
 PG_FUNCTION_INFO_V1(plpython_inline_handler);
 
@@ -437,6 +440,42 @@ plpython_return_error_callback(void *arg)
 		errcontext("while creating return value");
 }
 
+static bool
+PLy_procedure_is_trigger(Form_pg_proc procStruct)
+{
+	return (procStruct->prorettype == TRIGGEROID ||
+			(procStruct->prorettype == OPAQUEOID &&
+			 procStruct->pronargs == 0));
+}
+
+Datum
+plpython_validator(PG_FUNCTION_ARGS)
+{
+	Oid			funcoid = PG_GETARG_OID(0);
+	HeapTuple	tuple;
+	Form_pg_proc procStruct;
+	bool		is_trigger;
+
+	if (!check_function_bodies)
+	{
+		PG_RETURN_VOID();
+	}
+
+	/* Get the new function's pg_proc entry */
+	tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
+	if (!HeapTupleIsValid(tuple))
+		elog(ERROR, "cache lookup failed for function %u", funcoid);
+	procStruct = (Form_pg_proc) GETSTRUCT(tuple);
+
+	is_trigger = PLy_procedure_is_trigger(procStruct);
+
+	ReleaseSysCache(tuple);
+
+	PLy_procedure_get(funcoid, is_trigger);
+
+	PG_RETURN_VOID();
+}
+
 Datum
 plpython_call_handler(PG_FUNCTION_ARGS)
 {
-- 
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