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/*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <sys/uio.h>
#include "common-utils.h"
#include "xlator.h"
#include "graph-utils.h"
#include "libglusterfs-messages.h"
struct gf_printer {
ssize_t (*write) (struct gf_printer *gp, char *buf, size_t len);
void *priv;
int len;
};
static ssize_t
gp_write_file (struct gf_printer *gp, char *buf, size_t len)
{
FILE *f = gp->priv;
if (fwrite (buf, len, 1, f) != 1) {
gf_msg ("graph-print", GF_LOG_ERROR, errno,
LG_MSG_FWRITE_FAILED, "fwrite failed");
return -1;
}
return len;
}
static ssize_t
gp_write_buf (struct gf_printer *gp, char *buf, size_t len)
{
struct iovec *iov = gp->priv;
if (iov->iov_len < len) {
gf_msg ("graph-print", GF_LOG_ERROR, 0, LG_MSG_BUFFER_FULL,
"buffer full");
return -1;
}
memcpy (iov->iov_base, buf, len);
iov->iov_base += len;
iov->iov_len -= len;
return len;
}
static int
gpprintf (struct gf_printer *gp, const char *format, ...)
{
va_list arg;
char *str = NULL;
int ret = 0;
va_start (arg, format);
ret = gf_vasprintf (&str, format, arg);
va_end (arg);
if (ret < 0)
return ret;
ret = gp->write (gp, str, ret);
GF_FREE (str);
return ret;
}
#define GPPRINTF(gp, fmt, ...) do { \
ret = gpprintf (gp, fmt, ## __VA_ARGS__); \
if (ret == -1) \
goto out; \
else \
gp->len += ret; \
} while (0)
static int
_print_volume_options (dict_t *d, char *k, data_t *v,
void *tmp)
{
struct gf_printer *gp = tmp;
int ret = 0;
GPPRINTF (gp, " option %s %s\n", k, v->data);
return 0;
out:
/* means, it is a failure */
return -1;
}
static int
glusterfs_graph_print (struct gf_printer *gp, glusterfs_graph_t *graph)
{
xlator_t *trav = NULL;
xlator_list_t *xch = NULL;
int ret = 0;
ssize_t len = 0;
if (!graph->first)
return 0;
for (trav = graph->first; trav->next; trav = trav->next);
for (; trav; trav = trav->prev) {
GPPRINTF (gp, "volume %s\n type %s\n", trav->name,
trav->type);
ret = dict_foreach (trav->options, _print_volume_options, gp);
if (ret)
goto out;
if (trav->children) {
GPPRINTF (gp, " subvolumes");
for (xch = trav->children; xch; xch = xch->next)
GPPRINTF (gp, " %s", xch->xlator->name);
GPPRINTF (gp, "\n");
}
GPPRINTF (gp, "end-volume\n");
if (trav != graph->first)
GPPRINTF (gp, "\n");
}
out:
len = gp->len;
if (ret == -1) {
gf_msg ("graph-print", GF_LOG_ERROR, 0, LG_MSG_PRINT_FAILED,
"printing failed");
return -1;
}
return len;
#undef GPPRINTF
}
int
glusterfs_graph_print_file (FILE *file, glusterfs_graph_t *graph)
{
struct gf_printer gp = { .write = gp_write_file,
.priv = file
};
return glusterfs_graph_print (&gp, graph);
}
char *
glusterfs_graph_print_buf (glusterfs_graph_t *graph)
{
FILE *f = NULL;
struct iovec iov = {0,};
int len = 0;
char *buf = NULL;
struct gf_printer gp = { .write = gp_write_buf,
.priv = &iov
};
f = fopen ("/dev/null", "a");
if (!f) {
gf_msg ("graph-print", GF_LOG_ERROR, errno,
LG_MSG_DIR_OP_FAILED, "cannot open /dev/null");
return NULL;
}
len = glusterfs_graph_print_file (f, graph);
fclose (f);
if (len == -1)
return NULL;
buf = GF_CALLOC (1, len + 1, gf_common_mt_graph_buf);
if (!buf) {
return NULL;
}
iov.iov_base = buf;
iov.iov_len = len;
len = glusterfs_graph_print (&gp, graph);
if (len == -1) {
GF_FREE (buf);
return NULL;
}
return buf;
}
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