Clean up plpython error reporting so that its regression test passes

with some amount of cleanliness.  I see no need to report the internal
Python name rather than the SQL procedure name in error tracebacks.

src/pl/plpython/error.expected

 SELECT invalid_type_uncaught('rick');
-WARNING:  plpython: in function __plpython_procedure_invalid_type_uncaught_49801:
-plpy.SPIError: Cache lookup for type `test' failed.
+WARNING:  plpython: in function invalid_type_uncaught:
+plpy.SPIError: Unknown error in PLy_spi_prepare.
+ERROR:  Type "test" does not exist
 SELECT invalid_type_caught('rick');
-WARNING:  plpython: in function __plpython_procedure_invalid_type_caught_49802:
-plpy.SPIError: Cache lookup for type `test' failed.
+WARNING:  plpython: in function invalid_type_caught:
+plpy.SPIError: Unknown error in PLy_spi_prepare.
+ERROR:  Type "test" does not exist
 SELECT invalid_type_reraised('rick');
-WARNING:  plpython: in function __plpython_procedure_invalid_type_reraised_49803:
-plpy.SPIError: Cache lookup for type `test' failed.
+WARNING:  plpython: in function invalid_type_reraised:
+plpy.SPIError: Unknown error in PLy_spi_prepare.
+ERROR:  Type "test" does not exist
 SELECT valid_type('rick');
  valid_type 
 ------------
@@ -14,20 +17,20 @@ SELECT valid_type('rick');
 (1 row)
 
 SELECT read_file('/etc/passwd');
-ERROR:  plpython: Call of function `__plpython_procedure_read_file_49809' failed.
+ERROR:  plpython: Call of function `read_file' failed.
 exceptions.IOError: can't open files in restricted mode
 SELECT write_file('/tmp/plpython','This is very bad');
-ERROR:  plpython: Call of function `__plpython_procedure_write_file_49810' failed.
+ERROR:  plpython: Call of function `write_file' failed.
 exceptions.IOError: can't open files in restricted mode
 SELECT getpid();
-ERROR:  plpython: Call of function `__plpython_procedure_getpid_49811' failed.
-exceptions.AttributeError: getpid
+ERROR:  plpython: Call of function `getpid' failed.
+exceptions.AttributeError: 'module' object has no attribute 'getpid'
 SELECT uname();
-ERROR:  plpython: Call of function `__plpython_procedure_uname_49812' failed.
-exceptions.AttributeError: uname
+ERROR:  plpython: Call of function `uname' failed.
+exceptions.AttributeError: 'module' object has no attribute 'uname'
 SELECT sys_exit();
-ERROR:  plpython: Call of function `__plpython_procedure_sys_exit_49813' failed.
-exceptions.AttributeError: exit
+ERROR:  plpython: Call of function `sys_exit' failed.
+exceptions.AttributeError: 'module' object has no attribute 'exit'
 SELECT sys_argv();
     sys_argv    
 ----------------

src/pl/plpython/plpython.c

@@ -29,7 +29,7 @@
  * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
  * IDENTIFICATION
- *	$Header: /cvsroot/pgsql/src/pl/plpython/plpython.c,v 1.27 2002/11/22 16:25:30 tgl Exp $
+ *	$Header: /cvsroot/pgsql/src/pl/plpython/plpython.c,v 1.28 2003/01/31 22:25:13 tgl Exp $
  *
  *********************************************************************
  */
@@ -127,7 +127,8 @@ typedef struct PLyTypeInfo
  */
 typedef struct PLyProcedure
 {
-	char	   *proname;
+	char	   *proname;		/* SQL name of procedure */
+	char	   *pyname;			/* Python name of procedure */
 	TransactionId fn_xmin;
 	CommandId	fn_cmin;
 	PLyTypeInfo result;			/* also used to store info for trigger
@@ -1050,7 +1051,7 @@ static PLyProcedure *
 PLy_procedure_create(FunctionCallInfo fcinfo, bool is_trigger,
 					 HeapTuple procTup, char *key)
 {
-	char		procName[256];
+	char		procName[NAMEDATALEN+256];
 
 	DECLARE_EXC();
 	Form_pg_proc procStruct;
@@ -1073,8 +1074,10 @@ PLy_procedure_create(FunctionCallInfo fcinfo, bool is_trigger,
 		elog(FATAL, "plpython: Procedure name would overrun buffer");
 
 	proc = PLy_malloc(sizeof(PLyProcedure));
-	proc->proname = PLy_malloc(strlen(procName) + 1);
-	strcpy(proc->proname, procName);
+	proc->proname = PLy_malloc(strlen(NameStr(procStruct->proname)) + 1);
+	strcpy(proc->proname, NameStr(procStruct->proname));
+	proc->pyname = PLy_malloc(strlen(procName) + 1);
+	strcpy(proc->pyname, procName);
 	proc->fn_xmin = HeapTupleHeaderGetXmin(procTup->t_data);
 	proc->fn_cmin = HeapTupleHeaderGetCmin(procTup->t_data);
 	PLy_typeinfo_init(&proc->result);
@@ -1235,21 +1238,21 @@ PLy_procedure_compile(PLyProcedure * proc, const char *src)
 	/*
 	 * insert the function code into the interpreter
 	 */
-	msrc = PLy_procedure_munge_source(proc->proname, src);
+	msrc = PLy_procedure_munge_source(proc->pyname, src);
 	crv = PyObject_CallMethod(proc->interp, "r_exec", "s", msrc);
 	free(msrc);
 
 	if ((crv != NULL) && (!PyErr_Occurred()))
 	{
 		int			clen;
-		char		call[256];
+		char		call[NAMEDATALEN+256];
 
 		Py_DECREF(crv);
 
 		/*
 		 * compile a call to the function
 		 */
-		clen = snprintf(call, sizeof(call), "%s()", proc->proname);
+		clen = snprintf(call, sizeof(call), "%s()", proc->pyname);
 		if ((clen < 0) || (clen >= sizeof(call)))
 			elog(ERROR, "plpython: string would overflow buffer.");
 		proc->code = Py_CompileString(call, "<string>", Py_eval_input);
@@ -1321,6 +1324,8 @@ PLy_procedure_delete(PLyProcedure * proc)
 	Py_XDECREF(proc->me);
 	if (proc->proname)
 		PLy_free(proc->proname);
+	if (proc->pyname)
+		PLy_free(proc->pyname);
 	for (i = 0; i < proc->nargs; i++)
 		if (proc->args[i].is_rel == 1)
 		{
@@ -2748,9 +2753,12 @@ PLy_output(volatile int level, PyObject * self, PyObject * args)
 }
 
 
-/* Get the last procedure name called by the backend ( the innermost,
+/*
+ * Get the last procedure name called by the backend ( the innermost,
  * If a plpython procedure call calls the backend and the backend calls
  * another plpython procedure )
+ *
+ * NB: this returns SQL name, not the internal Python procedure name
  */
 
 char *

src/pl/plpython/test.sh

@@ -30,8 +30,8 @@ echo -n "*** Running error handling tests."
 psql -q -e $DBNAME < plpython_error.sql > error.output 2>&1
 echo " Done. ***"
 
-echo -n "*** Checking the results of the feature tests"
-if diff -u feature.expected feature.output > feature.diff 2>&1 ; then
+echo -n "*** Checking the results of the feature tests."
+if diff -c feature.expected feature.output > feature.diff 2>&1 ; then
   echo -n " passed!"
 else
   echo -n " failed!  Please examine feature.diff."
@@ -39,10 +39,9 @@ fi
 echo " Done. ***"
 
 echo -n "*** Checking the results of the error handling tests."
-diff -u error.expected error.output > error.diff 2>&1
+if diff -c error.expected error.output > error.diff 2>&1 ; then
+  echo -n " passed!"
+else
+  echo -n " failed!  Please examine error.diff."
+fi
 echo " Done. ***"
-echo "*** You need to check the file error.diff and make sure that"
-echo "    any differences are due only to the oid encoded in the "
-echo "    python function name. ***"
-
-# or write a fancier error checker...