greenplumn plpy_elog 源码
greenplumn plpy_elog 代码
文件路径：/src/pl/plpython/plpy_elog.c
/*
* reporting Python exceptions as PostgreSQL errors
*
* src/pl/plpython/plpy_elog.c
*/
#include "postgres.h"
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "plpython.h"
#include "plpy_elog.h"
#include "plpy_main.h"
#include "plpy_procedure.h"
PyObject *PLy_exc_error = NULL;
PyObject *PLy_exc_fatal = NULL;
PyObject *PLy_exc_spi_error = NULL;
static void PLy_traceback(PyObject *e, PyObject *v, PyObject *tb,
char **xmsg, char **tbmsg, int *tb_depth);
static void PLy_get_spi_error_data(PyObject *exc, int *sqlerrcode, char **detail,
char **hint, char **query, int *position,
char **schema_name, char **table_name, char **column_name,
char **datatype_name, char **constraint_name);
static void PLy_get_error_data(PyObject *exc, int *sqlerrcode, char **detail,
char **hint, char **schema_name, char **table_name, char **column_name,
char **datatype_name, char **constraint_name);
static char *get_source_line(const char *src, int lineno);
static void get_string_attr(PyObject *obj, char *attrname, char **str);
static bool set_string_attr(PyObject *obj, char *attrname, char *str);
/*
* Emit a PG error or notice, together with any available info about
* the current Python error, previously set by PLy_exception_set().
* This should be used to propagate Python errors into PG. If fmt is
* NULL, the Python error becomes the primary error message, otherwise
* it becomes the detail. If there is a Python traceback, it is put
* in the context.
*/
void
PLy_elog_impl(int elevel, const char *fmt,...)
{
int save_errno = errno;
char *xmsg;
char *tbmsg;
int tb_depth;
StringInfoData emsg;
PyObject *exc,
*val,
*tb;
const char *primary = NULL;
int sqlerrcode = 0;
char *detail = NULL;
char *hint = NULL;
char *query = NULL;
int position = 0;
char *schema_name = NULL;
char *table_name = NULL;
char *column_name = NULL;
char *datatype_name = NULL;
char *constraint_name = NULL;
/*
* If the error was a KeyboardException that we raised because
* of query cancellation, then CHECK_FOR_INTERRUPTS() will throw
* a better error message than we do here, with
* "canceling statement due to user request" or similar message.
* Give it a chance.
*/
CHECK_FOR_INTERRUPTS();
PyErr_Fetch(&exc, &val, &tb);
if (exc != NULL)
{
PyErr_NormalizeException(&exc, &val, &tb);
if (PyErr_GivenExceptionMatches(val, PLy_exc_spi_error))
PLy_get_spi_error_data(val, &sqlerrcode,
&detail, &hint, &query, &position,
&schema_name, &table_name, &column_name,
&datatype_name, &constraint_name);
else if (PyErr_GivenExceptionMatches(val, PLy_exc_error))
PLy_get_error_data(val, &sqlerrcode, &detail, &hint,
&schema_name, &table_name, &column_name,
&datatype_name, &constraint_name);
else if (PyErr_GivenExceptionMatches(val, PLy_exc_fatal))
elevel = FATAL;
}
/* this releases our refcount on tb! */
PLy_traceback(exc, val, tb,
&xmsg, &tbmsg, &tb_depth);
if (fmt)
{
initStringInfo(&emsg);
for (;;)
{
va_list ap;
int needed;
errno = save_errno;
va_start(ap, fmt);
needed = appendStringInfoVA(&emsg, dgettext(TEXTDOMAIN, fmt), ap);
va_end(ap);
if (needed == 0)
break;
enlargeStringInfo(&emsg, needed);
}
primary = emsg.data;
/* Since we have a format string, we cannot have a SPI detail. */
Assert(detail == NULL);
/* If there's an exception message, it goes in the detail. */
if (xmsg)
detail = xmsg;
}
else
{
if (xmsg)
primary = xmsg;
}
PG_TRY();
{
ereport(elevel,
(errcode(sqlerrcode ? sqlerrcode : ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
errmsg_internal("%s", primary ? primary : "no exception data"),
(detail) ? errdetail_internal("%s", detail) : 0,
(tb_depth > 0 && tbmsg) ? errcontext("%s", tbmsg) : 0,
(hint) ? errhint("%s", hint) : 0,
(query) ? internalerrquery(query) : 0,
(position) ? internalerrposition(position) : 0,
(schema_name) ? err_generic_string(PG_DIAG_SCHEMA_NAME,
schema_name) : 0,
(table_name) ? err_generic_string(PG_DIAG_TABLE_NAME,
table_name) : 0,
(column_name) ? err_generic_string(PG_DIAG_COLUMN_NAME,
column_name) : 0,
(datatype_name) ? err_generic_string(PG_DIAG_DATATYPE_NAME,
datatype_name) : 0,
(constraint_name) ? err_generic_string(PG_DIAG_CONSTRAINT_NAME,
constraint_name) : 0));
}
PG_CATCH();
{
if (fmt)
pfree(emsg.data);
if (xmsg)
pfree(xmsg);
if (tbmsg)
pfree(tbmsg);
Py_XDECREF(exc);
Py_XDECREF(val);
PG_RE_THROW();
}
PG_END_TRY();
if (fmt)
pfree(emsg.data);
if (xmsg)
pfree(xmsg);
if (tbmsg)
pfree(tbmsg);
Py_XDECREF(exc);
Py_XDECREF(val);
}
/*
* Extract a Python traceback from the given exception data.
*
* The exception error message is returned in xmsg, the traceback in
* tbmsg (both as palloc'd strings) and the traceback depth in
* tb_depth.
*
* We release refcounts on all the Python objects in the traceback stack,
* but not on e or v.
*/
static void
PLy_traceback(PyObject *e, PyObject *v, PyObject *tb,
char **xmsg, char **tbmsg, int *tb_depth)
{
PyObject *e_type_o;
PyObject *e_module_o;
char *e_type_s = NULL;
char *e_module_s = NULL;
PyObject *vob = NULL;
char *vstr;
StringInfoData xstr;
StringInfoData tbstr;
/*
* if no exception, return nulls
*/
if (e == NULL)
{
*xmsg = NULL;
*tbmsg = NULL;
*tb_depth = 0;
return;
}
/*
* Format the exception and its value and put it in xmsg.
*/
e_type_o = PyObject_GetAttrString(e, "__name__");
e_module_o = PyObject_GetAttrString(e, "__module__");
if (e_type_o)
e_type_s = PyString_AsString(e_type_o);
if (e_type_s)
e_module_s = PyString_AsString(e_module_o);
if (v && ((vob = PyObject_Str(v)) != NULL))
vstr = PyString_AsString(vob);
else
vstr = "unknown";
initStringInfo(&xstr);
if (!e_type_s || !e_module_s)
{
if (PyString_Check(e))
/* deprecated string exceptions */
appendStringInfoString(&xstr, PyString_AsString(e));
else
/* shouldn't happen */
appendStringInfoString(&xstr, "unrecognized exception");
}
/* mimics behavior of traceback.format_exception_only */
else if (strcmp(e_module_s, "builtins") == 0
|| strcmp(e_module_s, "__main__") == 0
|| strcmp(e_module_s, "exceptions") == 0)
appendStringInfo(&xstr, "%s", e_type_s);
else
appendStringInfo(&xstr, "%s.%s", e_module_s, e_type_s);
appendStringInfo(&xstr, ": %s", vstr);
*xmsg = xstr.data;
/*
* Now format the traceback and put it in tbmsg.
*/
*tb_depth = 0;
initStringInfo(&tbstr);
/* Mimic Python traceback reporting as close as possible. */
appendStringInfoString(&tbstr, "Traceback (most recent call last):");
while (tb != NULL && tb != Py_None)
{
PyObject *volatile tb_prev = NULL;
PyObject *volatile frame = NULL;
PyObject *volatile code = NULL;
PyObject *volatile name = NULL;
PyObject *volatile lineno = NULL;
PyObject *volatile filename = NULL;
PG_TRY();
{
/*
* Ancient versions of Python (circa 2.3) contain a bug whereby
* the fetches below can fail if the error indicator is set.
*/
PyErr_Clear();
lineno = PyObject_GetAttrString(tb, "tb_lineno");
if (lineno == NULL)
elog(ERROR, "could not get line number from Python traceback");
frame = PyObject_GetAttrString(tb, "tb_frame");
if (frame == NULL)
elog(ERROR, "could not get frame from Python traceback");
code = PyObject_GetAttrString(frame, "f_code");
if (code == NULL)
elog(ERROR, "could not get code object from Python frame");
name = PyObject_GetAttrString(code, "co_name");
if (name == NULL)
elog(ERROR, "could not get function name from Python code object");
filename = PyObject_GetAttrString(code, "co_filename");
if (filename == NULL)
elog(ERROR, "could not get file name from Python code object");
}
PG_CATCH();
{
Py_XDECREF(frame);
Py_XDECREF(code);
Py_XDECREF(name);
Py_XDECREF(lineno);
Py_XDECREF(filename);
PG_RE_THROW();
}
PG_END_TRY();
/* The first frame always points at <module>, skip it. */
if (*tb_depth > 0)
{
PLyExecutionContext *exec_ctx = PLy_current_execution_context();
char *proname;
char *fname;
char *line;
char *plain_filename;
long plain_lineno;
/*
* The second frame points at the internal function, but to mimic
* Python error reporting we want to say <module>.
*/
if (*tb_depth == 1)
fname = "<module>";
else
fname = PyString_AsString(name);
proname = PLy_procedure_name(exec_ctx->curr_proc);
plain_filename = PyString_AsString(filename);
plain_lineno = PyInt_AsLong(lineno);
if (proname == NULL)
appendStringInfo(
&tbstr, "\n PL/Python anonymous code block, line %ld, in %s",
plain_lineno - 1, fname);
else
appendStringInfo(
&tbstr, "\n PL/Python function \"%s\", line %ld, in %s",
proname, plain_lineno - 1, fname);
/*
* function code object was compiled with "<string>" as the
* filename
*/
if (exec_ctx->curr_proc && plain_filename != NULL &&
strcmp(plain_filename, "<string>") == 0)
{
/*
* If we know the current procedure, append the exact line
* from the source, again mimicking Python's traceback.py
* module behavior. We could store the already line-split
* source to avoid splitting it every time, but producing a
* traceback is not the most important scenario to optimize
* for. But we do not go as far as traceback.py in reading
* the source of imported modules.
*/
line = get_source_line(exec_ctx->curr_proc->src, plain_lineno);
if (line)
{
appendStringInfo(&tbstr, "\n %s", line);
pfree(line);
}
}
}
Py_DECREF(frame);
Py_DECREF(code);
Py_DECREF(name);
Py_DECREF(lineno);
Py_DECREF(filename);
/* Release the current frame and go to the next one. */
tb_prev = tb;
tb = PyObject_GetAttrString(tb, "tb_next");
Assert(tb_prev != Py_None);
Py_DECREF(tb_prev);
if (tb == NULL)
elog(ERROR, "could not traverse Python traceback");
(*tb_depth)++;
}
/* Return the traceback. */
*tbmsg = tbstr.data;
Py_XDECREF(e_type_o);
Py_XDECREF(e_module_o);
Py_XDECREF(vob);
}
/*
* Extract error code from SPIError's sqlstate attribute.
*/
static void
PLy_get_sqlerrcode(PyObject *exc, int *sqlerrcode)
{
PyObject *sqlstate;
char *buffer;
sqlstate = PyObject_GetAttrString(exc, "sqlstate");
if (sqlstate == NULL)
return;
buffer = PyString_AsString(sqlstate);
if (strlen(buffer) == 5 &&
strspn(buffer, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ") == 5)
{
*sqlerrcode = MAKE_SQLSTATE(buffer[0], buffer[1], buffer[2],
buffer[3], buffer[4]);
}
Py_DECREF(sqlstate);
}
/*
* Extract the error data from a SPIError
*/
static void
PLy_get_spi_error_data(PyObject *exc, int *sqlerrcode, char **detail,
char **hint, char **query, int *position,
char **schema_name, char **table_name,
char **column_name,
char **datatype_name, char **constraint_name)
{
PyObject *spidata;
spidata = PyObject_GetAttrString(exc, "spidata");
if (spidata != NULL)
{
PyArg_ParseTuple(spidata, "izzzizzzzz",
sqlerrcode, detail, hint, query, position,
schema_name, table_name, column_name,
datatype_name, constraint_name);
}
else
{
/*
* If there's no spidata, at least set the sqlerrcode. This can happen
* if someone explicitly raises a SPI exception from Python code.
*/
PLy_get_sqlerrcode(exc, sqlerrcode);
}
Py_XDECREF(spidata);
}
/*
* Extract the error data from an Error.
*
* Note: position and query attributes are never set for Error so, unlike
* PLy_get_spi_error_data, this function doesn't return them.
*/
static void
PLy_get_error_data(PyObject *exc, int *sqlerrcode, char **detail, char **hint,
char **schema_name, char **table_name, char **column_name,
char **datatype_name, char **constraint_name)
{
PLy_get_sqlerrcode(exc, sqlerrcode);
get_string_attr(exc, "detail", detail);
get_string_attr(exc, "hint", hint);
get_string_attr(exc, "schema_name", schema_name);
get_string_attr(exc, "table_name", table_name);
get_string_attr(exc, "column_name", column_name);
get_string_attr(exc, "datatype_name", datatype_name);
get_string_attr(exc, "constraint_name", constraint_name);
}
/*
* Get the given source line as a palloc'd string
*/
static char *
get_source_line(const char *src, int lineno)
{
const char *s = NULL;
const char *next = src;
int current = 0;
/* sanity check */
if (lineno <= 0)
return NULL;
while (current < lineno)
{
s = next;
next = strchr(s + 1, '\n');
current++;
if (next == NULL)
break;
}
if (current != lineno)
return NULL;
while (*s && isspace((unsigned char) *s))
s++;
if (next == NULL)
return pstrdup(s);
/*
* Sanity check, next < s if the line was all-whitespace, which should
* never happen if Python reported a frame created on that line, but check
* anyway.
*/
if (next < s)
return NULL;
return pnstrdup(s, next - s);
}
/* call PyErr_SetString with a vprint interface and translation support */
void
PLy_exception_set(PyObject *exc, const char *fmt,...)
{
char buf[1024];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), dgettext(TEXTDOMAIN, fmt), ap);
va_end(ap);
PyErr_SetString(exc, buf);
}
/* same, with pluralized message */
void
PLy_exception_set_plural(PyObject *exc,
const char *fmt_singular, const char *fmt_plural,
unsigned long n,...)
{
char buf[1024];
va_list ap;
va_start(ap, n);
vsnprintf(buf, sizeof(buf),
dngettext(TEXTDOMAIN, fmt_singular, fmt_plural, n),
ap);
va_end(ap);
PyErr_SetString(exc, buf);
}
/* set attributes of the given exception to details from ErrorData */
void
PLy_exception_set_with_details(PyObject *excclass, ErrorData *edata)
{
PyObject *args = NULL;
PyObject *error = NULL;
args = Py_BuildValue("(s)", edata->message);
if (!args)
goto failure;
/* create a new exception with the error message as the parameter */
error = PyObject_CallObject(excclass, args);
if (!error)
goto failure;
if (!set_string_attr(error, "sqlstate",
unpack_sql_state(edata->sqlerrcode)))
goto failure;
if (!set_string_attr(error, "detail", edata->detail))
goto failure;
if (!set_string_attr(error, "hint", edata->hint))
goto failure;
if (!set_string_attr(error, "query", edata->internalquery))
goto failure;
if (!set_string_attr(error, "schema_name", edata->schema_name))
goto failure;
if (!set_string_attr(error, "table_name", edata->table_name))
goto failure;
if (!set_string_attr(error, "column_name", edata->column_name))
goto failure;
if (!set_string_attr(error, "datatype_name", edata->datatype_name))
goto failure;
if (!set_string_attr(error, "constraint_name", edata->constraint_name))
goto failure;
PyErr_SetObject(excclass, error);
Py_DECREF(args);
Py_DECREF(error);
return;
failure:
Py_XDECREF(args);
Py_XDECREF(error);
elog(ERROR, "could not convert error to Python exception");
}
/* get string value of an object attribute */
static void
get_string_attr(PyObject *obj, char *attrname, char **str)
{
PyObject *val;
val = PyObject_GetAttrString(obj, attrname);
if (val != NULL && val != Py_None)
{
*str = pstrdup(PyString_AsString(val));
}
Py_XDECREF(val);
}
/* set an object attribute to a string value, returns true when the set was
* successful
*/
static bool
set_string_attr(PyObject *obj, char *attrname, char *str)
{
int result;
PyObject *val;
if (str != NULL)
{
val = PyString_FromString(str);
if (!val)
return false;
}
else
{
val = Py_None;
Py_INCREF(Py_None);
}
result = PyObject_SetAttrString(obj, attrname, val);
Py_DECREF(val);
return result != -1;
}
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