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/******************************************************
Copyright (c) 2011-2017 Percona LLC and/or its affiliates.
The xbstream format writer implementation.
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; version 2 of the License.
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 Street, Fifth Floor, Boston, MA 02110-1335 USA
*******************************************************/
#include <my_global.h>
#include <my_base.h>
#include <zlib.h>
#include "common.h"
#include "xbstream.h"
/* Group writes smaller than this into a single chunk */
#define XB_STREAM_MIN_CHUNK_SIZE (10 * 1024 * 1024)
struct xb_wstream_struct {
pthread_mutex_t mutex;
};
struct xb_wstream_file_struct {
xb_wstream_t *stream;
char *path;
size_t path_len;
char chunk[XB_STREAM_MIN_CHUNK_SIZE];
char *chunk_ptr;
size_t chunk_free;
my_off_t offset;
void *userdata;
xb_stream_write_callback *write;
};
static int xb_stream_flush(xb_wstream_file_t *file);
static int xb_stream_write_chunk(xb_wstream_file_t *file,
const void *buf, size_t len);
static int xb_stream_write_eof(xb_wstream_file_t *file);
static
ssize_t
xb_stream_default_write_callback(xb_wstream_file_t *file __attribute__((unused)),
void *userdata __attribute__((unused)),
const void *buf, size_t len)
{
if (my_write(my_fileno(stdout), (const uchar *)buf, len, MYF(MY_WME | MY_NABP)))
return -1;
return len;
}
xb_wstream_t *
xb_stream_write_new(void)
{
xb_wstream_t *stream;
stream = (xb_wstream_t *) my_malloc(PSI_NOT_INSTRUMENTED, sizeof(xb_wstream_t), MYF(MY_FAE));
pthread_mutex_init(&stream->mutex, NULL);
return stream;;
}
xb_wstream_file_t *
xb_stream_write_open(xb_wstream_t *stream, const char *path,
MY_STAT *mystat __attribute__((unused)),
void *userdata,
xb_stream_write_callback *onwrite)
{
xb_wstream_file_t *file;
size_t path_len;
path_len = strlen(path);
if (path_len > FN_REFLEN) {
msg("xb_stream_write_open(): file path is too long.");
return NULL;
}
file = (xb_wstream_file_t *) my_malloc(PSI_NOT_INSTRUMENTED, sizeof(xb_wstream_file_t) +
path_len + 1, MYF(MY_FAE));
file->path = (char *) (file + 1);
#ifdef _WIN32
/* Normalize path on Windows, so we can restore elsewhere.*/
{
int i;
for (i = 0; ; i++) {
file->path[i] = (path[i] == '\\') ? '/' : path[i];
if (!path[i])
break;
}
}
#else
memcpy(file->path, path, path_len + 1);
#endif
file->path_len = path_len;
file->stream = stream;
file->offset = 0;
file->chunk_ptr = file->chunk;
file->chunk_free = XB_STREAM_MIN_CHUNK_SIZE;
if (onwrite) {
#ifdef _WIN32
setmode(fileno(stdout), _O_BINARY);
#endif
file->userdata = userdata;
file->write = onwrite;
} else {
file->userdata = NULL;
file->write = xb_stream_default_write_callback;
}
return file;
}
int
xb_stream_write_data(xb_wstream_file_t *file, const void *buf, size_t len)
{
if (len < file->chunk_free) {
memcpy(file->chunk_ptr, buf, len);
file->chunk_ptr += len;
file->chunk_free -= len;
return 0;
}
if (xb_stream_flush(file))
return 1;
return xb_stream_write_chunk(file, buf, len);
}
int
xb_stream_write_close(xb_wstream_file_t *file)
{
if (xb_stream_flush(file) ||
xb_stream_write_eof(file)) {
my_free(file);
return 1;
}
my_free(file);
return 0;
}
int
xb_stream_write_done(xb_wstream_t *stream)
{
pthread_mutex_destroy(&stream->mutex);
my_free(stream);
return 0;
}
static
int
xb_stream_flush(xb_wstream_file_t *file)
{
if (file->chunk_ptr == file->chunk) {
return 0;
}
if (xb_stream_write_chunk(file, file->chunk,
file->chunk_ptr - file->chunk)) {
return 1;
}
file->chunk_ptr = file->chunk;
file->chunk_free = XB_STREAM_MIN_CHUNK_SIZE;
return 0;
}
static
int
xb_stream_write_chunk(xb_wstream_file_t *file, const void *buf, size_t len)
{
/* Chunk magic + flags + chunk type + path_len + path + len + offset +
checksum */
uchar tmpbuf[sizeof(XB_STREAM_CHUNK_MAGIC) - 1 + 1 + 1 + 4 +
FN_REFLEN + 8 + 8 + 4];
uchar *ptr;
xb_wstream_t *stream = file->stream;
ulong checksum;
/* Write xbstream header */
ptr = tmpbuf;
/* Chunk magic */
memcpy(ptr, XB_STREAM_CHUNK_MAGIC, sizeof(XB_STREAM_CHUNK_MAGIC) - 1);
ptr += sizeof(XB_STREAM_CHUNK_MAGIC) - 1;
*ptr++ = 0; /* Chunk flags */
*ptr++ = (uchar) XB_CHUNK_TYPE_PAYLOAD; /* Chunk type */
int4store(ptr, file->path_len); /* Path length */
ptr += 4;
memcpy(ptr, file->path, file->path_len); /* Path */
ptr += file->path_len;
int8store(ptr, len); /* Payload length */
ptr += 8;
checksum = my_checksum(0, buf, len);
pthread_mutex_lock(&stream->mutex);
int8store(ptr, file->offset); /* Payload offset */
ptr += 8;
int4store(ptr, checksum);
ptr += 4;
xb_ad(ptr <= tmpbuf + sizeof(tmpbuf));
if (file->write(file, file->userdata, tmpbuf, ptr-tmpbuf) == -1)
goto err;
if (file->write(file, file->userdata, buf, len) == -1) /* Payload */
goto err;
file->offset+= len;
pthread_mutex_unlock(&stream->mutex);
return 0;
err:
pthread_mutex_unlock(&stream->mutex);
return 1;
}
static
int
xb_stream_write_eof(xb_wstream_file_t *file)
{
/* Chunk magic + flags + chunk type + path_len + path */
uchar tmpbuf[sizeof(XB_STREAM_CHUNK_MAGIC) - 1 + 1 + 1 + 4 +
FN_REFLEN];
uchar *ptr;
xb_wstream_t *stream = file->stream;
pthread_mutex_lock(&stream->mutex);
/* Write xbstream header */
ptr = tmpbuf;
/* Chunk magic */
memcpy(ptr, XB_STREAM_CHUNK_MAGIC, sizeof(XB_STREAM_CHUNK_MAGIC) - 1);
ptr += sizeof(XB_STREAM_CHUNK_MAGIC) - 1;
*ptr++ = 0; /* Chunk flags */
*ptr++ = (uchar) XB_CHUNK_TYPE_EOF; /* Chunk type */
int4store(ptr, file->path_len); /* Path length */
ptr += 4;
memcpy(ptr, file->path, file->path_len); /* Path */
ptr += file->path_len;
xb_ad(ptr <= tmpbuf + sizeof(tmpbuf));
if (file->write(file, file->userdata, tmpbuf,
(ulonglong) (ptr - tmpbuf)) == -1)
goto err;
pthread_mutex_unlock(&stream->mutex);
return 0;
err:
pthread_mutex_unlock(&stream->mutex);
return 1;
}
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