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/************************************************************************************
Copyright (C) 2015 Georg Richter and MariaDB Corporation AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not see <http://www.gnu.org/licenses>
or write to the Free Software Foundation, Inc.,
51 Franklin St., Fifth Floor, Boston, MA 02110, USA
*************************************************************************************/
/* MariaDB virtual IO plugin for Windows shared memory communication */
#ifdef _WIN32
#include <ma_global.h>
#include <ma_sys.h>
#include <errmsg.h>
#include <mysql.h>
#include <mysql/client_plugin.h>
#include <string.h>
#include <ma_string.h>
#define PVIO_SHM_BUFFER_SIZE 16000 + 4
my_bool pvio_shm_set_timeout(MARIADB_PVIO *pvio, enum enum_pvio_timeout type, int timeout);
int pvio_shm_get_timeout(MARIADB_PVIO *pvio, enum enum_pvio_timeout type);
ssize_t pvio_shm_read(MARIADB_PVIO *pvio, uchar *buffer, size_t length);
ssize_t pvio_shm_write(MARIADB_PVIO *pvio, const uchar *buffer, size_t length);
int pvio_shm_wait_io_or_timeout(MARIADB_PVIO *pvio, my_bool is_read, int timeout);
my_bool pvio_shm_blocking(MARIADB_PVIO *pvio, my_bool value, my_bool *old_value);
my_bool pvio_shm_connect(MARIADB_PVIO *pvio, MA_PVIO_CINFO *cinfo);
my_bool pvio_shm_close(MARIADB_PVIO *pvio);
int pvio_shm_shutdown(MARIADB_PVIO *pvio);
my_bool pvio_shm_is_alive(MARIADB_PVIO *pvio);
my_bool pvio_shm_get_handle(MARIADB_PVIO *pvio, void *handle);
struct st_ma_pvio_methods pvio_shm_methods= {
pvio_shm_set_timeout,
pvio_shm_get_timeout,
pvio_shm_read,
NULL,
pvio_shm_write,
NULL,
pvio_shm_wait_io_or_timeout,
pvio_shm_blocking,
pvio_shm_connect,
pvio_shm_close,
NULL,
NULL,
pvio_shm_get_handle,
NULL,
pvio_shm_is_alive,
NULL,
pvio_shm_shutdown
};
#ifndef HAVE_SHMEM_DYNAMIC
MARIADB_PVIO_PLUGIN pvio_shmem_plugin=
#else
MARIADB_PVIO_PLUGIN _mysql_client_plugin_declaration_=
#endif
{
MARIADB_CLIENT_PVIO_PLUGIN,
MARIADB_CLIENT_PVIO_PLUGIN_INTERFACE_VERSION,
"pvio_shmem",
"Georg Richter",
"MariaDB virtual IO plugin for Windows shared memory communication",
{1, 0, 0},
"LGPPL",
NULL,
NULL,
NULL,
NULL,
&pvio_shm_methods,
};
enum enum_shm_events
{
PVIO_SHM_SERVER_WROTE= 0,
PVIO_SHM_SERVER_READ,
PVIO_SHM_CLIENT_WROTE,
PVIO_SHM_CLIENT_READ,
PVIO_SHM_CONNECTION_CLOSED
};
typedef struct {
HANDLE event[5];
HANDLE file_map;
LPVOID *map;
char *read_pos;
size_t buffer_size;
} PVIO_SHM;
char *StrEvent[]= {"SERVER_WROTE", "SERVER_READ", "CLIENT_WROTE", "CLIENT_READ", "CONNECTION_CLOSED"};
struct st_pvio_shm {
char *shm_name;
};
my_bool pvio_shm_set_timeout(MARIADB_PVIO *pvio, enum enum_pvio_timeout type, int timeout)
{
if (!pvio)
return 1;
pvio->timeout[type]= (timeout > 0) ? timeout * 1000 : INFINITE;
return 0;
}
int pvio_shm_get_timeout(MARIADB_PVIO *pvio, enum enum_pvio_timeout type)
{
if (!pvio)
return -1;
return pvio->timeout[type] / 1000;
}
ssize_t pvio_shm_read(MARIADB_PVIO *pvio, uchar *buffer, size_t length)
{
PVIO_SHM *pvio_shm= (PVIO_SHM *)pvio->data;
size_t copy_size= length;
HANDLE events[2];
if (!pvio_shm)
return -1;
/* we need to wait for write and close events */
if (!pvio_shm->buffer_size)
{
events[0]= pvio_shm->event[PVIO_SHM_CONNECTION_CLOSED];
events[1]= pvio_shm->event[PVIO_SHM_SERVER_WROTE];
switch(WaitForMultipleObjects(2, events, 0, pvio->timeout[PVIO_READ_TIMEOUT]))
{
case WAIT_OBJECT_0: /* server closed connection */
SetLastError(ERROR_GRACEFUL_DISCONNECT);
return -1;
case WAIT_OBJECT_0 +1: /* server_wrote event */
break;
case WAIT_TIMEOUT:
SetLastError(ETIMEDOUT);
default:
return -1;
}
/* server sent data */
pvio_shm->read_pos= (char *)pvio_shm->map;
pvio_shm->buffer_size= uint4korr(pvio_shm->read_pos);
pvio_shm->read_pos+= 4;
}
if (pvio_shm->buffer_size < copy_size)
copy_size= pvio_shm->buffer_size;
if (copy_size)
{
memcpy(buffer, (uchar *)pvio_shm->read_pos, pvio_shm->buffer_size);
pvio_shm->read_pos+= copy_size;
pvio_shm->buffer_size-= copy_size;
}
/* we need to read again */
if (!pvio_shm->buffer_size)
if (!SetEvent(pvio_shm->event[PVIO_SHM_CLIENT_READ]))
return -1;
return (ssize_t)copy_size;
}
ssize_t pvio_shm_write(MARIADB_PVIO *pvio, const uchar *buffer, size_t length)
{
HANDLE events[2];
PVIO_SHM *pvio_shm= (PVIO_SHM *)pvio->data;
size_t bytes_to_write= length;
uchar *buffer_pos= (uchar *)buffer;
if (!pvio_shm)
return -1;
events[0]= pvio_shm->event[PVIO_SHM_CONNECTION_CLOSED];
events[1]= pvio_shm->event[PVIO_SHM_SERVER_READ];
while (bytes_to_write)
{
size_t pkt_length;
switch (WaitForMultipleObjects(2, events, 0, pvio->timeout[PVIO_WRITE_TIMEOUT])) {
case WAIT_OBJECT_0: /* connection closed */
SetLastError(ERROR_GRACEFUL_DISCONNECT);
return -1;
case WAIT_OBJECT_0 + 1: /* server_read */
break;
case WAIT_TIMEOUT:
SetLastError(ETIMEDOUT);
default:
return -1;
}
pkt_length= MIN(PVIO_SHM_BUFFER_SIZE, length);
int4store(pvio_shm->map, pkt_length);
memcpy((uchar *)pvio_shm->map + 4, buffer_pos, length);
buffer_pos+= length;
bytes_to_write-= length;
if (!SetEvent(pvio_shm->event[PVIO_SHM_CLIENT_WROTE]))
return -1;
}
return (ssize_t)length;
}
int pvio_shm_wait_io_or_timeout(MARIADB_PVIO *pvio, my_bool is_read, int timeout)
{
return 0;
}
my_bool pvio_shm_blocking(MARIADB_PVIO *pvio, my_bool block, my_bool *previous_mode)
{
/* not supported */
return 0;
}
int pvio_shm_keepalive(MARIADB_PVIO *pvio)
{
/* not supported */
return 0;
}
int pvio_shm_fast_send(MARIADB_PVIO *pvio)
{
/* not supported */
return 0;
}
my_bool pvio_shm_connect(MARIADB_PVIO *pvio, MA_PVIO_CINFO *cinfo)
{
const char *base_memory_name;
char *prefixes[]= {"", "Global\\", NULL};
char *shm_name, *shm_suffix, *shm_prefix;
uchar i= 0;
int len;
DWORD cid;
DWORD dwDesiredAccess= EVENT_MODIFY_STATE | SYNCHRONIZE;
HANDLE hdlConnectRequest= NULL,
hdlConnectRequestAnswer= NULL,
file_map= NULL;
LPVOID map= NULL;
PVIO_SHM *pvio_shm= (PVIO_SHM*)LocalAlloc(LMEM_ZEROINIT, sizeof(PVIO_SHM));
if (!pvio_shm)
{
PVIO_SET_ERROR(cinfo->mysql, CR_OUT_OF_MEMORY, unknown_sqlstate, 0, "");
return 0;
}
/* MariaDB server constructs the event name as follows:
"Global\\base_memory_name" or
"\\base_memory_name"
*/
base_memory_name= (cinfo->host) ? cinfo->host : SHM_DEFAULT_NAME;
if (!(shm_name= (char *)LocalAlloc(LMEM_ZEROINIT, strlen(base_memory_name) + 40)))
{
PVIO_SET_ERROR(cinfo->mysql, CR_OUT_OF_MEMORY, unknown_sqlstate, 0, "");
goto error;
}
/* iterate through prefixes */
while (prefixes[i])
{
len= sprintf(shm_name, "%s%s_", prefixes[i], base_memory_name);
shm_suffix= shm_name + len;
strcpy(shm_suffix, "CONNECT_REQUEST");
if ((hdlConnectRequest= OpenEvent(dwDesiredAccess, 0, shm_name)))
{
/* save prefix to prevent further loop */
shm_prefix= prefixes[i];
break;
}
i++;
}
if (!hdlConnectRequest)
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Opening CONNECT_REQUEST event failed", GetLastError());
goto error;
}
strcpy(shm_suffix, "CONNECT_ANSWER");
if (!(hdlConnectRequestAnswer= OpenEvent(dwDesiredAccess, 0, shm_name)))
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Opening CONNECT_ANSWER event failed", GetLastError());
goto error;
}
/* get connection id, so we can build the filename used for connection */
strcpy(shm_suffix, "CONNECT_DATA");
if (!(file_map= OpenFileMapping(FILE_MAP_WRITE, 0, shm_name)))
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "OpenFileMapping failed", GetLastError());
goto error;
}
/* try to get first 4 bytes, which represents connection_id */
if (!(map= MapViewOfFile(file_map, FILE_MAP_WRITE, 0, 0, sizeof(cid))))
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Reading connection_id failed", GetLastError());
goto error;
}
/* notify server */
if (!SetEvent(hdlConnectRequest))
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Failed sending connection request", GetLastError());
goto error;
}
/* Wait for server answer */
switch(WaitForSingleObject(hdlConnectRequestAnswer, pvio->timeout[PVIO_CONNECT_TIMEOUT])) {
case WAIT_ABANDONED:
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Mutex was not released in time", GetLastError());
goto error;
break;
case WAIT_FAILED:
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Operation wait failed", GetLastError());
goto error;
break;
case WAIT_TIMEOUT:
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Operation timed out", GetLastError());
goto error;
break;
case WAIT_OBJECT_0:
break;
default:
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Wait for server failed", GetLastError());
break;
}
cid= uint4korr(map);
len= sprintf(shm_name, "%s%s_%d_", shm_prefix, base_memory_name, cid);
shm_suffix= shm_name + len;
strcpy(shm_suffix, "DATA");
pvio_shm->file_map= OpenFileMapping(FILE_MAP_WRITE, 0, shm_name);
if (pvio_shm->file_map == NULL)
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "OpenFileMapping failed", GetLastError());
goto error;
}
if (!(pvio_shm->map= MapViewOfFile(pvio_shm->file_map, FILE_MAP_WRITE, 0, 0, PVIO_SHM_BUFFER_SIZE)))
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "MapViewOfFile failed", GetLastError());
goto error;
}
for (i=0; i < 5; i++)
{
strcpy(shm_suffix, StrEvent[i]);
if (!(pvio_shm->event[i]= OpenEvent(dwDesiredAccess, 0, shm_name)))
{
PVIO_SET_ERROR(cinfo->mysql, CR_SHARED_MEMORY_CONNECT_ERROR, unknown_sqlstate, 0, "Couldn't create event", GetLastError());
goto error;
}
}
/* we will first read from server */
SetEvent(pvio_shm->event[PVIO_SHM_SERVER_READ]);
error:
if (hdlConnectRequest)
CloseHandle(hdlConnectRequest);
if (hdlConnectRequestAnswer)
CloseHandle(hdlConnectRequestAnswer);
if (shm_name)
LocalFree(shm_name);
if (map)
UnmapViewOfFile(map);
if (file_map)
CloseHandle(file_map);
if (pvio_shm)
{
/* check if all events are set */
if (pvio_shm->event[4])
{
pvio->data= (void *)pvio_shm;
pvio->mysql= cinfo->mysql;
pvio->type= cinfo->type;
pvio_shm->read_pos= (char *)pvio_shm->map;
pvio->mysql->net.pvio= pvio;
return 0;
}
for (i=0;i < 5; i++)
if (pvio_shm->event[i])
CloseHandle(pvio_shm->event[i]);
if (pvio_shm->map)
UnmapViewOfFile(pvio_shm->map);
if (pvio_shm->file_map)
CloseHandle(pvio_shm->file_map);
LocalFree(pvio_shm);
}
return 1;
}
my_bool pvio_shm_close(MARIADB_PVIO *pvio)
{
PVIO_SHM *pvio_shm= (PVIO_SHM *)pvio->data;
int i;
if (!pvio_shm)
return 1;
/* notify server */
SetEvent(pvio_shm->event[PVIO_SHM_CONNECTION_CLOSED]);
UnmapViewOfFile(pvio_shm->map);
CloseHandle(pvio_shm->file_map);
for (i=0; i < 5; i++)
CloseHandle(pvio_shm->event[i]);
LocalFree(pvio_shm);
pvio->data= NULL;
return 0;
}
my_bool pvio_shm_get_socket(MARIADB_PVIO *pvio, void *handle)
{
return 1;
}
my_bool pvio_shm_is_blocking(MARIADB_PVIO *pvio)
{
return 1;
}
int pvio_shm_shutdown(MARIADB_PVIO *pvio)
{
PVIO_SHM *pvio_shm= (PVIO_SHM *)pvio->data;
if (pvio_shm)
return (SetEvent(pvio_shm->event[PVIO_SHM_CONNECTION_CLOSED]) ? 0 : 1);
return 1;
}
my_bool pvio_shm_is_alive(MARIADB_PVIO *pvio)
{
PVIO_SHM *pvio_shm;
if (!pvio || !pvio->data)
return FALSE;
pvio_shm= (PVIO_SHM *)pvio->data;
return WaitForSingleObject(pvio_shm->event[PVIO_SHM_CONNECTION_CLOSED], 0)!=WAIT_OBJECT_0;
}
my_bool pvio_shm_get_handle(MARIADB_PVIO *pvio, void *handle)
{
*(HANDLE **)handle= 0;
if (!pvio || !pvio->data)
return FALSE;
*(HANDLE **)handle= ((PVIO_SHM*)pvio->data)->event;
return TRUE;
}
#endif
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