/*
* Insert the procedure into the Python interpreter
*/
void
PLy_procedure_compile(PLyProcedure *proc, const char *src)
{
PyObject *crv = NULL;
char *msrc;
proc->globals = PyDict_Copy(PLy_interp_globals);
/*
* SD is private preserved data between calls. GD is global data shared by
* all functions
*/
proc->statics = PyDict_New();
PyDict_SetItemString(proc->globals, "SD", proc->statics);
/*
* insert the function code into the interpreter
*/
msrc = PLy_procedure_munge_source(proc->pyname, src);
/* Save the mangled source for later inclusion in tracebacks */
proc->src = PLy_strdup(msrc);
crv = PyRun_String(msrc, Py_file_input, proc->globals, NULL);
pfree(msrc);
if (crv != NULL)
{
int clen;
char call[NAMEDATALEN + 256];
Py_DECREF(crv);
/*
* compile a call to the function
*/
clen = snprintf(call, sizeof(call), "%s()", proc->pyname);
if (clen < 0 || clen >= sizeof(call))
elog(ERROR, "string would overflow buffer");
proc->code = Py_CompileString(call, "<string>", Py_eval_input);
if (proc->code != NULL)
return;
}
if (proc->proname)
PLy_elog(ERROR, "could not compile PL/Python function \"%s\"",
proc->proname);
else
PLy_elog(ERROR, "could not compile anonymous PL/Python code block");
}
/*
* Create a new PLyProcedure structure
*/
static PLyProcedure *
PLy_procedure_create(HeapTuple procTup, Oid fn_oid, bool is_trigger)
{
char procName[NAMEDATALEN + 256];
Form_pg_proc procStruct;
PLyProcedure *volatile proc;
char *volatile procSource = NULL;
Datum prosrcdatum;
bool isnull;
int i,
rv;
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
rv = snprintf(procName, sizeof(procName),
"__plpython_procedure_%s_%u",
NameStr(procStruct->proname),
fn_oid);
if (rv >= sizeof(procName) || rv < 0)
elog(ERROR, "procedure name would overrun buffer");
proc = PLy_malloc(sizeof(PLyProcedure));
proc->proname = PLy_strdup(NameStr(procStruct->proname));
proc->pyname = PLy_strdup(procName);
proc->fn_xmin = HeapTupleHeaderGetRawXmin(procTup->t_data);
proc->fn_tid = procTup->t_self;
/* Remember if function is STABLE/IMMUTABLE */
proc->fn_readonly =
(procStruct->provolatile != PROVOLATILE_VOLATILE);
PLy_typeinfo_init(&proc->result);
for (i = 0; i < FUNC_MAX_ARGS; i++)
PLy_typeinfo_init(&proc->args[i]);
proc->nargs = 0;
proc->code = proc->statics = NULL;
proc->globals = NULL;
proc->is_setof = procStruct->proretset;
proc->setof = NULL;
proc->src = NULL;
proc->argnames = NULL;
PG_TRY();
{
/*
* get information required for output conversion of the return value,
* but only if this isn't a trigger.
*/
if (!is_trigger)
{
HeapTuple rvTypeTup;
Form_pg_type rvTypeStruct;
rvTypeTup = SearchSysCache1(TYPEOID,
ObjectIdGetDatum(procStruct->prorettype));
if (!HeapTupleIsValid(rvTypeTup))
elog(ERROR, "cache lookup failed for type %u",
procStruct->prorettype);
rvTypeStruct = (Form_pg_type) GETSTRUCT(rvTypeTup);
/* Disallow pseudotype result, except for void or record */
if (rvTypeStruct->typtype == TYPTYPE_PSEUDO)
{
if (procStruct->prorettype == TRIGGEROID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("trigger functions can only be called as triggers")));
else if (procStruct->prorettype != VOIDOID &&
procStruct->prorettype != RECORDOID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("PL/Python functions cannot return type %s",
format_type_be(procStruct->prorettype))));
}
if (rvTypeStruct->typtype == TYPTYPE_COMPOSITE ||
procStruct->prorettype == RECORDOID)
{
/*
* Tuple: set up later, during first call to
* PLy_function_handler
*/
proc->result.out.d.typoid = procStruct->prorettype;
proc->result.out.d.typmod = -1;
proc->result.is_rowtype = 2;
}
else
{
/* do the real work */
PLy_output_datum_func(&proc->result, rvTypeTup);
}
ReleaseSysCache(rvTypeTup);
}
/*
* Now get information required for input conversion of the
* procedure's arguments. Note that we ignore output arguments here.
* If the function returns record, those I/O functions will be set up
* when the function is first called.
*/
if (procStruct->pronargs)
{
Oid *types;
char **names,
*modes;
int i,
pos,
total;
/* extract argument type info from the pg_proc tuple */
total = get_func_arg_info(procTup, &types, &names, &modes);
/* count number of in+inout args into proc->nargs */
if (modes == NULL)
proc->nargs = total;
else
{
/* proc->nargs was initialized to 0 above */
for (i = 0; i < total; i++)
{
if (modes[i] != PROARGMODE_OUT &&
modes[i] != PROARGMODE_TABLE)
(proc->nargs)++;
}
}
proc->argnames = (char **) PLy_malloc0(sizeof(char *) * proc->nargs);
for (i = pos = 0; i < total; i++)
{
HeapTuple argTypeTup;
Form_pg_type argTypeStruct;
if (modes &&
(modes[i] == PROARGMODE_OUT ||
modes[i] == PROARGMODE_TABLE))
continue; /* skip OUT arguments */
Assert(types[i] == procStruct->proargtypes.values[pos]);
argTypeTup = SearchSysCache1(TYPEOID,
ObjectIdGetDatum(types[i]));
if (!HeapTupleIsValid(argTypeTup))
elog(ERROR, "cache lookup failed for type %u", types[i]);
argTypeStruct = (Form_pg_type) GETSTRUCT(argTypeTup);
/* check argument type is OK, set up I/O function info */
switch (argTypeStruct->typtype)
{
case TYPTYPE_PSEUDO:
/* Disallow pseudotype argument */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("PL/Python functions cannot accept type %s",
format_type_be(types[i]))));
break;
case TYPTYPE_COMPOSITE:
/* we'll set IO funcs at first call */
proc->args[pos].is_rowtype = 2;
break;
default:
PLy_input_datum_func(&(proc->args[pos]),
types[i],
argTypeTup);
break;
}
/* get argument name */
proc->argnames[pos] = names ? PLy_strdup(names[i]) : NULL;
ReleaseSysCache(argTypeTup);
pos++;
}
}
/*
* get the text of the function.
*/
prosrcdatum = SysCacheGetAttr(PROCOID, procTup,
Anum_pg_proc_prosrc, &isnull);
if (isnull)
elog(ERROR, "null prosrc");
procSource = TextDatumGetCString(prosrcdatum);
PLy_procedure_compile(proc, procSource);
pfree(procSource);
procSource = NULL;
}
PG_CATCH();
{
PLy_procedure_delete(proc);
if (procSource)
pfree(procSource);
PG_RE_THROW();
}
PG_END_TRY();
return proc;
}
Datum
plpython_inline_handler(PG_FUNCTION_ARGS)
{
InlineCodeBlock *codeblock = (InlineCodeBlock *) DatumGetPointer(PG_GETARG_DATUM(0));
FunctionCallInfoData fake_fcinfo;
FmgrInfo flinfo;
PLyProcedure proc;
PLyExecutionContext *exec_ctx;
ErrorContextCallback plerrcontext;
PLy_initialize();
/* Note: SPI_finish() happens in plpy_exec.c, which is dubious design */
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "SPI_connect failed");
MemSet(&fake_fcinfo, 0, sizeof(fake_fcinfo));
MemSet(&flinfo, 0, sizeof(flinfo));
fake_fcinfo.flinfo = &flinfo;
flinfo.fn_oid = InvalidOid;
flinfo.fn_mcxt = CurrentMemoryContext;
MemSet(&proc, 0, sizeof(PLyProcedure));
proc.pyname = PLy_strdup("__plpython_inline_block");
proc.result.out.d.typoid = VOIDOID;
/*
* Push execution context onto stack. It is important that this get
* popped again, so avoid putting anything that could throw error between
* here and the PG_TRY.
*/
exec_ctx = PLy_push_execution_context();
PG_TRY();
{
/*
* Setup error traceback support for ereport().
* plpython_inline_error_callback doesn't currently need exec_ctx, but
* for consistency with plpython_call_handler we do it the same way.
*/
plerrcontext.callback = plpython_inline_error_callback;
plerrcontext.arg = exec_ctx;
plerrcontext.previous = error_context_stack;
error_context_stack = &plerrcontext;
PLy_procedure_compile(&proc, codeblock->source_text);
exec_ctx->curr_proc = &proc;
PLy_exec_function(&fake_fcinfo, &proc);
}
PG_CATCH();
{
PLy_pop_execution_context();
PLy_procedure_delete(&proc);
PyErr_Clear();
PG_RE_THROW();
}
PG_END_TRY();
/* Destroy the execution context */
PLy_pop_execution_context();
/* Now clean up the transient procedure we made */
PLy_procedure_delete(&proc);
PG_RETURN_VOID();
}
