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/* Copyright (C) 2009 PrimeBase Technologies GmbH, Germany
*
* PrimeBase Media Stream for MySQL
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Barry Leslie
*
* 2009-07-16
*
* H&G2JCtL
*
* PBMS interface used to enable engines for use with the PBMS engine.
*
* For an example on how to build this into an engine have a look at the PBXT engine
* in file ha_pbxt.cc. Search for 'PBMS_ENABLED'.
*
*/
#include "xt_config.h"
#ifdef PBMS_ENABLED
#ifdef DRIZZLED
#include <sys/stat.h>
#include <drizzled/common_includes.h>
#include <drizzled/plugin.h>
#else
#include "mysql_priv.h"
#include <mysql/plugin.h>
#define session_alloc(sess, size) thd_alloc(sess, size);
#define current_session current_thd
#endif
#define GET_BLOB_FIELD(t, i) (Field_blob *)(t->field[t->s->blob_field[i]])
#define DB_NAME(f) (f->table->s->db.str)
#define TAB_NAME(f) (*(f->table_name))
#define PBMS_API pbms_enabled_api
#include "pbms_enabled.h"
static PBMS_API pbms_api;
PBMSEngineRec enabled_engine = {
MS_ENGINE_VERSION
};
//====================
bool pbms_initialize(const char *engine_name, bool isServer, PBMSResultPtr result)
{
int err;
strncpy(enabled_engine.ms_engine_name, engine_name, 32);
enabled_engine.ms_internal = isServer;
enabled_engine.ms_engine_name[31] = 0;
err = pbms_api.registerEngine(&enabled_engine, result);
return (err == 0);
}
//====================
void pbms_finalize()
{
pbms_api.deregisterEngine(&enabled_engine);
}
//====================
int pbms_write_row_blobs(TABLE *table, uchar *row_buffer, PBMSResultPtr result)
{
Field_blob *field;
char *blob_rec, *blob;
size_t packlength, i, org_length, length;
char blob_url_buffer[PBMS_BLOB_URL_SIZE];
int err;
String type_name;
if (table->s->blob_fields == 0)
return 0;
for (i= 0; i < table->s->blob_fields; i++) {
field = GET_BLOB_FIELD(table, i);
// Note: field->type() always returns MYSQL_TYPE_BLOB regardless of the type of BLOB
field->sql_type(type_name);
if (strcasecmp(type_name.c_ptr(), "LongBlob"))
continue;
// Get the blob record:
blob_rec = (char *)row_buffer + field->offset(field->table->getInsertRecord());
packlength = field->pack_length() - field->table->s->blob_ptr_size;
memcpy(&blob, blob_rec +packlength, sizeof(char*));
org_length = field->get_length((uchar *)blob_rec);
// Signal PBMS to record a new reference to the BLOB.
// If 'blob' is not a BLOB URL then it will be stored in the repositor as a new BLOB
// and a reference to it will be created.
err = pbms_api.retainBlob(DB_NAME(field), TAB_NAME(field), blob_url_buffer, blob, org_length, field->field_index, result);
if (err)
return err;
// If the BLOB length changed reset it.
// This will happen if the BLOB data was replaced with a BLOB reference.
length = strlen(blob_url_buffer) +1;
if ((length != org_length) || memcmp(blob_url_buffer, blob, length)) {
if (length != org_length) {
field->store_length((uchar *)blob_rec, packlength, length);
}
if (length > org_length) {
// This can only happen if the BLOB URL is actually larger than the BLOB itself.
blob = (char *) session_alloc(current_session, length);
memcpy(blob_rec+packlength, &blob, sizeof(char*));
}
memcpy(blob, blob_url_buffer, length);
}
}
return 0;
}
//====================
int pbms_delete_row_blobs(TABLE *table, const uchar *row_buffer, PBMSResultPtr result)
{
Field_blob *field;
const char *blob_rec;
char *blob;
size_t packlength, i, length;
int err;
String type_name;
if (table->s->blob_fields == 0)
return 0;
for (i= 0; i < table->s->blob_fields; i++) {
field = GET_BLOB_FIELD(table, i);
// Note: field->type() always returns MYSQL_TYPE_BLOB regardless of the type of BLOB
field->sql_type(type_name);
if (strcasecmp(type_name.c_ptr(), "LongBlob"))
continue;
// Get the blob record:
blob_rec = (char *)row_buffer + field->offset(field->table->getInsertRecord());
packlength = field->pack_length() - field->table->s->blob_ptr_size;
length = field->get_length((uchar *)blob_rec);
memcpy(&blob, blob_rec +packlength, sizeof(char*));
// Signal PBMS to delete the reference to the BLOB.
err = pbms_api.releaseBlob(DB_NAME(field), TAB_NAME(field), blob, length, result);
if (err)
return err;
}
return 0;
}
#define MAX_NAME_SIZE 64
static void parse_table_path(const char *path, char *db_name, char *tab_name)
{
const char *ptr = path + strlen(path) -1, *eptr;
int len;
*db_name = *tab_name = 0;
while ((ptr > path) && (*ptr != '/'))ptr --;
if (*ptr != '/')
return;
strncpy(tab_name, ptr+1, MAX_NAME_SIZE);
tab_name[MAX_NAME_SIZE-1] = 0;
eptr = ptr;
ptr--;
while ((ptr > path) && (*ptr != '/'))ptr --;
if (*ptr != '/')
return;
ptr++;
len = eptr - ptr;
if (len >= MAX_NAME_SIZE)
len = MAX_NAME_SIZE-1;
memcpy(db_name, ptr, len);
db_name[len] = 0;
}
//====================
int pbms_rename_table_with_blobs(const char *old_table_path, const char *new_table_path, PBMSResultPtr result)
{
char o_db_name[MAX_NAME_SIZE], n_db_name[MAX_NAME_SIZE], o_tab_name[MAX_NAME_SIZE], n_tab_name[MAX_NAME_SIZE];
parse_table_path(old_table_path, o_db_name, o_tab_name);
parse_table_path(new_table_path, n_db_name, n_tab_name);
if (strcmp(o_db_name, n_db_name)) {
result->mr_code = MS_ERR_INVALID_OPERATION;
strcpy(result->mr_message, "PBMS does not support renaming tables across databases.");
strcpy(result->mr_stack, "pbms_rename_table_with_blobs()");
return MS_ERR_INVALID_OPERATION;
}
return pbms_api.renameTable(o_db_name, o_tab_name, n_tab_name, result);
}
//====================
int pbms_delete_table_with_blobs(const char *table_path, PBMSResultPtr result)
{
char db_name[MAX_NAME_SIZE], tab_name[MAX_NAME_SIZE];
parse_table_path(table_path, db_name, tab_name);
return pbms_api.dropTable(db_name, tab_name, result);
}
//====================
void pbms_completed(TABLE *table, bool ok)
{
if ((!table) || (table->s->blob_fields != 0))
pbms_api.completed(ok) ;
return ;
}
#elif defined(__WIN__)
// Remove linker warning 4221 about empty file
namespace { char dummy; };
#endif // PBMS_ENABLED
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