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193 lines (147 loc) · 4.39 KB
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#include "postgres.h"
#include "storage/lwlock.h"
#include "storage/shmem.h"
#include "utils/guc.h"
#if PG_VERSION_NUM >= 160000
#include "utils/guc_hooks.h"
#else
#include "commands/variable.h"
#endif
#include "orafce.h"
#include "builtins.h"
#include "pipe.h"
#include "miscadmin.h"
/* default value */
char *nls_date_format = NULL;
char *orafce_timezone = NULL;
bool orafce_initialized = false;
size_t orafce_shmemmsgsz;
static const struct config_enum_entry orafce_compatibility_options[] = {
{"warning_oracle", ORAFCE_COMPATIBILITY_WARNING_ORACLE, false},
{"warning_orafce", ORAFCE_COMPATIBILITY_WARNING_ORAFCE, false},
{"oracle", ORAFCE_COMPATIBILITY_ORACLE, false},
{"orafce", ORAFCE_COMPATIBILITY_ORAFCE, false},
{NULL, 0, false}
};
#if PG_VERSION_NUM >= 150000
static shmem_request_hook_type prev_shmem_request_hook = NULL;
#endif
#if PG_VERSION_NUM >= 150000
static void
orafce_shmem_request(void)
{
if (prev_shmem_request_hook)
prev_shmem_request_hook();
RequestAddinShmemSpace(orafce_shmemmsgsz);
}
#endif
static bool
check_sys_guid_source(char **newval, void **extra, GucSource source)
{
char *value = *newval;
const char *canonicalstr;
char *result;
if (pg_strcasecmp(value, "uuid_generate_v1") == 0)
canonicalstr = "uuid_generate_v1";
else if (pg_strcasecmp(value, "uuid_generate_v1mc") == 0)
canonicalstr = "uuid_generate_v1mc";
else if (pg_strcasecmp(value, "uuid_generate_v4") == 0)
canonicalstr = "uuid_generate_v4";
else if (pg_strcasecmp(value, "gen_random_uuid") == 0)
canonicalstr = "gen_random_uuid";
else
return false;
#if PG_VERSION_NUM >= 160000
result = (char *) guc_malloc(LOG, 32);
if (!result)
return false;
strcpy(result, canonicalstr);
guc_free(*newval);
*newval = result;
#else
result = (char *) malloc(32);
if (!result)
return false;
strcpy(result, canonicalstr);
free(*newval);
*newval = result;
#endif
return true;
}
void
_PG_init(void)
{
if (process_shared_preload_libraries_in_progress)
orafce_shmemmsgsz = SHMEMMSGSZ_DEFAULT;
else
orafce_shmemmsgsz = SHMEMMSGSZ_MIN;
#if PG_VERSION_NUM >= 150000
prev_shmem_request_hook = shmem_request_hook;
shmem_request_hook = orafce_shmem_request;
#else
RequestAddinShmemSpace(orafce_shmemmsgsz);
#endif
/* Define custom GUC variables. */
DefineCustomStringVariable("orafce.nls_date_format",
"Emulate oracle's date output behaviour.",
NULL,
&nls_date_format,
NULL,
PGC_USERSET,
0,
NULL,
NULL, NULL);
DefineCustomStringVariable("orafce.timezone",
"Specify timezone used for sysdate function.",
NULL,
&orafce_timezone,
"GMT",
PGC_USERSET,
0,
check_timezone, NULL, NULL);
DefineCustomBoolVariable("orafce.varchar2_null_safe_concat",
"Specify wether empty string should be used instead of NULL in concat clauses with varchar2 and nvarchar2 data type.",
NULL,
&orafce_varchar2_null_safe_concat,
false,
PGC_USERSET,
0,
NULL, NULL, NULL);
DefineCustomStringVariable("orafce.sys_guid_source",
"Specify function from uuid-ossp extension used for making result.",
NULL,
&orafce_sys_guid_source,
"uuid_generate_v1",
PGC_USERSET,
0,
check_sys_guid_source, NULL, NULL);
DefineCustomEnumVariable("orafce.using_substring_zero_width_in_substr",
gettext_noop("behaviour of substr function when substring_length argument is zero"),
NULL,
&orafce_substring_length_is_zero,
ORAFCE_COMPATIBILITY_WARNING_ORACLE,
orafce_compatibility_options,
PGC_USERSET, 0,
NULL, NULL, NULL);
DefineCustomStringVariable("orafce.umask",
"Specify umask used by utl_file.fopen.",
NULL,
&orafce_umask_str,
"0077",
PGC_USERSET,
0,
orafce_umask_check_hook,
orafce_umask_assign_hook, NULL);
DefineCustomBoolVariable("orafce.oracle_compatibility_date_limit",
"Specify if an error is raised when the Oracle to_date() bug is reached.",
NULL,
&orafce_emit_error_on_date_bug,
true,
PGC_USERSET,
0,
NULL, NULL, NULL);
EmitWarningsOnPlaceholders("orafce");
RegisterXactCallback(orafce_xact_cb, NULL);
RegisterSubXactCallback(orafce_subxact_cb, NULL);
orafce_initialized = true;
}