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server.c
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/*
4store - a clustered RDF storage and query engine
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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
* Copyright 2006 Nick Lamb for Garlik.com
*/
#include "common/4store.h"
#include "common/hash.h"
#include "common/error.h"
#include "common/params.h"
#include "common/md5.h"
#include "backend.h"
#include "backend-intl.h"
#include "query-backend.h"
#include "import-backend.h"
#include "disk-space.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "lock.h"
#define PAD " "
//static const char feature_string[] = PAD "no-o-index freq" PAD;
static const char feature_string[] = PAD "no-o-index" PAD;
static unsigned char *handle_insert_resource(fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
}
if (length < sizeof(fs_rid) * 4) {
fs_error(LOG_ERR, "insert_resource(%d) too short", segment);
/* can't reply - semi-async */
}
int k, count;
unsigned char *record = content + 8;
memcpy(&count, content, sizeof (count));
fs_resource *resources = calloc(count, sizeof(fs_resource));
for (k = 0; k < count; ++k) {
unsigned int offset;
memcpy(&resources[k].rid, record, sizeof(fs_rid));
memcpy(&resources[k].attr, record + 8, sizeof(fs_rid));
memcpy(&offset, record + 16, sizeof(offset));
resources[k].lex = (char *) record + 20;
if (offset > length) {
fs_error(LOG_ERR, "insert_resource(%d) recv'd invalid offset", segment);
break;
}
record += offset;
length -= offset;
}
/* handle_insert_resource can be called after starting an import, thus
* with a LOCK_EX or on its own which means we have to do it here */
int res_lock = 0;
if (fs_lockable_test(be->res, LOCK_UN)) {
res_lock = 1;
if (fs_lockable_lock(be->res, LOCK_EX))
return fsp_error_new(segment, "could not lock resources");
}
fs_res_import(be, segment, count, resources);
free(resources);
if (res_lock)
if (fs_lockable_lock(be->res, LOCK_UN))
return fsp_error_new(segment, "could not unlock resources");
return NULL; /* no reply - semi-async */
}
static unsigned char * handle_commit_resource (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "commit_resource(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
/* handle_insert_resource can be called after starting an import, thus
* with a LOCK_EX or on its own which means we have to do it here */
int res_lock = 0;
if (fs_lockable_test(be->res, LOCK_UN)) {
res_lock = 1;
if (fs_lockable_lock(be->res, LOCK_EX))
return fsp_error_new(segment, "could not lock resources");
}
fs_res_import_commit(be, segment, 1);
if (res_lock)
if (fs_lockable_lock(be->res, LOCK_UN))
return fsp_error_new(segment, "could not unlock resources");
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_insert_quad (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 40) {
fs_error(LOG_ERR, "insert_quad(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
int flags;
int count = (length - 8) / 32;
fs_rid (*buffer)[4] = (fs_rid (*)[4]) (content + 8);
memcpy(&flags, content, sizeof (flags));
int ret = fs_quad_import(be, segment, flags, count, buffer);
if (ret) {
fs_error(LOG_ERR, "insert_quad(%d) failed", segment);
return fsp_error_new(segment, "quad insert failed");
}
return NULL; /* no reply - semi-async */
}
static unsigned char * handle_commit_quad (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length != sizeof(int)) {
fs_error(LOG_ERR, "commit_quad(%d) missing flags", segment);
return fsp_error_new(segment, "missing flags");
}
int flags;
memcpy(&flags, content, sizeof (flags));
/* handle_new_models can be called after starting an import, thus
* with a LOCK_EX or on its own which means we have to do it here */
int locking = 0;
if (fs_lockable_test(be->models, LOCK_UN)) {
locking = 1;
if (fs_lockable_lock(be->models, LOCK_EX))
return fsp_error_new(segment, "could not lock models");
if (fs_lockable_lock(be->predicates, LOCK_EX)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "could not lock predicates");
}
}
int ret = fs_quad_import_commit(be, segment, flags, 1);
if (locking) {
if (fs_lockable_lock(be->predicates, LOCK_UN)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "error releasing predicate lock");
}
if (fs_lockable_lock(be->models, LOCK_UN))
return fsp_error_new(segment, "error releasing model lock");
}
if (ret) {
fs_error(LOG_ERR, "commit_quad(%d) failed", segment);
return fsp_error_new(segment, "quad commit failed");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_price (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 24) {
fs_error(LOG_ERR, "price(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
unsigned char *reply;
unsigned long long int rows = 0;
fs_rid_vector models, subjects, predicates, objects;
unsigned int flags, value;
memcpy(&flags, content, sizeof (flags));
memcpy(&value, content + 4, sizeof (models.length));
models.size = models.length = value / 8;
memcpy(&value, content + 8, sizeof (subjects.length));
subjects.size = subjects.length = value / 8;
memcpy(&value, content + 12, sizeof (predicates.length));
predicates.size = predicates.length = value / 8;
memcpy(&value, content + 16, sizeof (objects.length));
objects.size = objects.length = value / 8;
content += 24;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8 + 24) {
fs_error(LOG_ERR, "price(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
rows = fs_bind_price(be, segment, flags, &models, &subjects, &predicates, &objects);
reply = message_new(FS_ESTIMATED_ROWS, segment, 8);
memcpy(reply + FS_HEADER, &rows, sizeof(rows));
return reply;
}
static unsigned char * handle_delete_models (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < sizeof(fs_rid)) {
fs_error(LOG_ERR, "delete_models(%d) missing model RIDs", segment);
return fsp_error_new(segment, "missing model RIDs");
}
fs_rid_vector models;
models.size = models.length = length / sizeof(fs_rid);
models.data = (fs_rid *) content;
/* handle_delete_models can be called after starting an import, thus
* with a LOCK_EX or on its own which means we have to do it here */
int model_lock = 0;
if (fs_lockable_test(be->models, LOCK_UN)) {
model_lock = 1;
if (fs_lockable_lock(be->models, LOCK_EX))
return fsp_error_new(segment, "could not lock models");
if (fs_lockable_lock(be->predicates, LOCK_EX)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "count not lock predicates");
}
}
fs_delete_models(be, segment, &models);
if (model_lock) {
if (fs_lockable_lock(be->predicates, LOCK_UN) ||
fs_lockable_lock(be->models, LOCK_UN))
return fsp_error_new(segment, "could not unlock storage");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_new_models (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < sizeof(fs_rid)) {
fs_error(LOG_ERR, "new_models(%d) missing model RIDs", segment);
return fsp_error_new(segment, "missing model RIDs");
}
fs_rid *models = (fs_rid *) content;
/* handle_new_models can be called after starting an import, thus
* with a LOCK_EX or on its own which means we have to do it here */
int locking = 0;
if (fs_lockable_test(be->models, LOCK_UN)) {
locking = 1;
if (fs_lockable_lock(be->models, LOCK_EX))
return fsp_error_new(segment, "could not lock models");
if (fs_lockable_lock(be->predicates, LOCK_EX)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "could not lock predicates");
}
}
int invalid_count = 0;
for (int k= 0; k < (length / sizeof(fs_rid)); ++k) {
if (FS_IS_URI(models[k])) {
fs_backend_model_set_usage(be, segment, models[k], 0);
} else {
invalid_count++;
}
}
if (locking) {
if (fs_lockable_lock(be->predicates, LOCK_UN)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "error releasing predicate lock");
}
if (fs_lockable_lock(be->models, LOCK_UN))
return fsp_error_new(segment, "error releasing model lock");
}
if (invalid_count > 0) {
return fsp_error_new(segment, "one or more model RIDs is not a URI");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_start_import (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "start_import(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
float free_space = fs_free_disk(fs_backend_get_kb(be));
if (free_space < be->min_free) {
fs_error(LOG_ERR, "segment %d only has %.1f%% free space", segment, free_space);
return fsp_error_new(segment, "low disk space");
}
if (fs_lockable_lock(be->models, LOCK_EX))
return fsp_error_new(segment, "could not lock models");
if (fs_lockable_lock(be->res, LOCK_EX)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "could not lock resources");
}
if (fs_lockable_lock(be->predicates, LOCK_EX)) {
fs_lockable_lock(be->res, LOCK_UN);
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "could not lock predicates");
}
fs_start_import(be, segment);
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_stop_import (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "stop_import(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
int ret = fs_stop_import(be, segment);
if (fs_lockable_lock(be->predicates, LOCK_UN)) {
fs_lockable_lock(be->res, LOCK_UN);
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "could not unlock predicates");
}
if (fs_lockable_lock(be->res, LOCK_UN)) {
fs_lockable_lock(be->models, LOCK_UN);
return fsp_error_new(segment, "could not unlock resources");
}
if (fs_lockable_lock(be->models, LOCK_UN))
return fsp_error_new(segment, "could not unlock models");
if (ret) {
return fsp_error_new(segment, "insert failed");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_delete_quads (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 32) {
fs_error(LOG_ERR, "delete_quads(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
fs_rid_vector models, subjects, predicates, objects;
models.size = models.length = length / 32;
subjects.size = subjects.length = length / 32;
predicates.size = predicates.length = length / 32;
objects.size = objects.length = length / 32;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8) {
fs_error(LOG_ERR, "delete_quads(%d) too short (%d < %d)", segment, length,
(models.size + subjects.size + predicates.size + objects.size) * 8);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
fs_rid_vector *args[4] = { &models, &subjects, &predicates, &objects };
fs_delete_quads(be, args);
/* FIXME, should check return value */
return message_new(FS_DONE_OK, 0, 0);
}
static unsigned char * handle_get_size_reverse (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_data_size(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_data_size size = fs_get_data_size(be, segment);
unsigned char *reply = message_new(FS_SIZE_REVERSE, segment, sizeof(size.quads_sr));
memcpy(reply + FS_HEADER, &size.quads_sr, sizeof(size.quads_sr));
return reply;
}
static unsigned char * handle_get_quad_freq (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length != 8) {
fs_error(LOG_ERR, "get_quad_freq(%d) wrong length %u", segment, length);
return fsp_error_new(segment, "wrong length");
}
int index, count;
memcpy(&index, content, sizeof(int));
memcpy(&count, content + sizeof(int), sizeof(int));
const char *filename;
/* this branch has no frequency data */
filename = "";
int fd = open(filename, FS_O_NOATIME | O_RDONLY, 0);
unsigned char *reply = message_new(FS_QUAD_FREQ, segment, count * sizeof(fs_quad_freq));
//ssize_t bytes = read(fd, reply + FS_HEADER, count * sizeof(fs_quad_freq));
ssize_t bytes = 0;
unsigned int *l = (unsigned int *) (reply + 4);
*l = bytes;
close(fd);
return reply;
}
static unsigned char * handle_choose_segment (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (fs_backend_open_files(be, segment, O_RDWR | O_CREAT, FS_OPEN_ALL)) {
fs_error(LOG_ERR, "failed to open files for segment %d", segment);
return fsp_error_new(segment, "cannot open indexes");
}
return message_new(FS_DONE_OK, 0, 0);
}
static unsigned char * handle_get_data_size (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_data_size(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_data_size size = fs_get_data_size(be, segment);
fs_old_data_size old_size;
old_size.quads_s = size.quads_s;
old_size.quads_o = size.quads_o;
old_size.resources = size.resources;
old_size.models_s = size.models_s;
old_size.models_o = size.models_o;
unsigned char *reply = message_new(FS_SIZE, segment, sizeof(old_size));
memcpy(reply + FS_HEADER, &old_size, sizeof(old_size));
return reply;
}
static unsigned char * handle_get_import_times (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_import_times(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_import_timing timing = fs_get_import_times(be, segment);
unsigned char *reply = message_new(FS_IMPORT_TIMES, segment, sizeof(timing));
memcpy(reply + FS_HEADER, &timing, sizeof(timing));
return reply;
}
static unsigned char * handle_segments (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment != 0) {
fs_error(LOG_ERR, "segments(%d) should only be sent with segment = 0", segment);
return fsp_error_new(segment, "only to be sent to segment = 0");
}
if (length > 0) {
fs_error(LOG_ERR, "segments(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
int segments[be->segments];
int count = fs_segments(be, segments);
unsigned char *reply = message_new(FS_SEGMENT_LIST, be->segments, sizeof(int) * count);
memcpy(reply + FS_HEADER, segments, sizeof(int) * count);
return reply;
}
static unsigned char * handle_node_segments (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment != 0) {
fs_error(LOG_ERR, "segments(%d) should only be sent with segment = 0", segment);
return fsp_error_new(segment, "only to be sent to segment = 0");
}
if (length > 0) {
fs_error(LOG_ERR, "segments(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
char segments[be->segments];
fs_node_segments(be, segments);
unsigned char *reply = message_new(FS_NODE_SEGMENT_LIST, be->segments, be->segments);
memcpy(reply + FS_HEADER, segments, be->segments);
return reply;
}
static unsigned char * handle_get_query_times (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_query_times(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_query_timing timing = fs_get_query_times(be, segment);
unsigned char *reply = message_new(FS_QUERY_TIMES, segment, sizeof(timing));
memcpy(reply + FS_HEADER, &timing, sizeof(timing));
return reply;
}
static unsigned char * handle_bind_limit (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned char *reply;
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 32) {
fs_error(LOG_ERR, "bind_limit(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
fs_rid_vector models, subjects, predicates, objects;
unsigned int flags, value;
int offset, limit;
memcpy(&flags, content, sizeof (flags));
memcpy(&offset, content + 4, sizeof (offset));
memcpy(&limit, content + 8, sizeof (limit));
memcpy(&value, content + 12, sizeof (models.length));
models.size = models.length = value / 8;
memcpy(&value, content + 16, sizeof (subjects.length));
subjects.size = subjects.length = value / 8;
memcpy(&value, content + 20, sizeof (predicates.length));
predicates.size = predicates.length = value / 8;
memcpy(&value, content + 24, sizeof (objects.length));
objects.size = objects.length = value / 8;
content += 32;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8 + 32) {
fs_error(LOG_ERR, "bind_limit(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
fs_rid_vector **bindings;
if (fs_lockable_lock(be->predicates, LOCK_SH)) {
return fsp_error_new(segment, "could not lock predicates");
}
bindings = fs_bind(be, segment, flags,
&models, &subjects, &predicates, &objects, offset, limit);
int k, cols = 0;
for (k = 0; k < 4; ++k) {
if (flags & 1 << k) cols++;
}
if (bindings == NULL) {
/* NULL => no match */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else if (cols == 0) {
/* Zero columns => match with no binding */
reply = message_new(FS_BIND_LIST, segment, 0);
} else {
/* otherwise return bindings */
reply = message_new(FS_BIND_LIST, segment, bindings[0]->length * 8 * cols);
unsigned char *data = reply + FS_HEADER;
for (k= 0; k < cols; ++k) {
memcpy(data, bindings[k]->data, bindings[k]->length * 8);
data += bindings[k]->length * 8;
}
}
fs_lockable_lock(be->predicates, LOCK_UN);
for (k = 0; k < cols; ++k) {
fs_rid_vector_free(bindings[k]);
}
free(bindings);
return reply;
}
static unsigned char * handle_reverse_bind (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned char *reply;
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 32) {
fs_error(LOG_ERR, "reverse_bind(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
fs_rid_vector models, subjects, predicates, objects;
unsigned int flags, value;
int offset, limit;
memcpy(&flags, content, sizeof (flags));
memcpy(&offset, content + 4, sizeof (offset));
memcpy(&limit, content + 8, sizeof (limit));
memcpy(&value, content + 12, sizeof (models.length));
models.size = models.length = value / 8;
memcpy(&value, content + 16, sizeof (subjects.length));
subjects.size = subjects.length = value / 8;
memcpy(&value, content + 20, sizeof (predicates.length));
predicates.size = predicates.length = value / 8;
memcpy(&value, content + 24, sizeof (objects.length));
objects.size = objects.length = value / 8;
content += 32;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8 + 32) {
fs_error(LOG_ERR, "bind_limit(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
if (fs_lockable_lock(be->predicates, LOCK_SH)) {
return fsp_error_new(segment, "could not lock predicates");
}
fs_rid_vector **bindings;
bindings = fs_reverse_bind(be, segment, flags, &models, &subjects, &predicates, &objects, offset, limit);
int k, cols = 0;
for (k = 0; k < 4; ++k) {
if (flags & 1 << k) cols++;
}
if (bindings == NULL) {
/* NULL => no match */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else if (cols == 0) {
/* Zero columns => match with no binding */
reply = message_new(FS_BIND_LIST, segment, 0);
} else if (!bindings[0]) {
/* this probably shouldn't happen, but it does */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else {
/* otherwise return bindings */
reply = message_new(FS_BIND_LIST, segment, bindings[0]->length * 8 * cols);
unsigned char *data = reply + FS_HEADER;
for (k= 0; k < cols; ++k) {
memcpy(data, bindings[k]->data, bindings[k]->length * 8);
data += bindings[k]->length * 8;
}
}
fs_lockable_lock(be->predicates, LOCK_UN);
for (k = 0; k < cols; ++k) {
fs_rid_vector_free(bindings[k]);
}
free(bindings);
return reply;
}
static unsigned char * handle_bind_first (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned char *reply;
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 32) {
fs_error(LOG_ERR, "bind_first(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
fs_rid_vector models, subjects, predicates, objects;
unsigned int flags, value;
int count;
memcpy(&flags, content, sizeof (flags));
memcpy(&count, content + 4, sizeof (count));
memcpy(&value, content + 12, sizeof (models.length));
models.size = models.length = value / 8;
memcpy(&value, content + 16, sizeof (subjects.length));
subjects.size = subjects.length = value / 8;
memcpy(&value, content + 20, sizeof (predicates.length));
predicates.size = predicates.length = value / 8;
memcpy(&value, content + 24, sizeof (objects.length));
objects.size = objects.length = value / 8;
content += 32;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8 + 32) {
fs_error(LOG_ERR, "bind_first(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
fs_rid_vector **bindings;
bindings = fs_bind_first(be, segment, flags, &models, &subjects,
&predicates, &objects, count);
int k, cols = 0;
for (k = 0; k < 4; ++k) {
if (flags & 1 << k) cols++;
}
if (bindings == NULL) {
/* NULL => no match */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else if (cols == 0) {
/* Zero columns => match with no binding */
reply = message_new(FS_BIND_LIST, segment, 0);
} else {
/* otherwise return bindings */
reply = message_new(FS_BIND_LIST, segment, bindings[0]->length * 8 * cols);
unsigned char *data = reply + FS_HEADER;
for (k= 0; k < cols; ++k) {
memcpy(data, bindings[k]->data, bindings[k]->length * 8);
data += bindings[k]->length * 8;
}
}
for (k = 0; k < cols; ++k) {
fs_rid_vector_free(bindings[k]);
}
free(bindings);
return reply;
}
static unsigned char * handle_bind_next (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned char *reply;
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length != 8) {
fs_error(LOG_ERR, "bind_next(%d) wrong length %u", segment, length);
return fsp_error_new(segment, "wrong length");
}
unsigned int flags;
int count;
memcpy(&flags, content, sizeof (flags));
memcpy(&count, content + 4, sizeof (count));
fs_rid_vector **bindings;
bindings = fs_bind_next(be, segment, flags, count);
int k, cols = 0;
for (k = 0; k < 4; ++k) {
if (flags & 1 << k) cols++;
}
if (bindings == NULL) {
/* NULL => no match */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else if (cols == 0) {
/* Zero columns => match with no binding */
reply = message_new(FS_BIND_LIST, segment, 0);
} else {
/* otherwise return bindings */
reply = message_new(FS_BIND_LIST, segment, bindings[0]->length * 8 * cols);
unsigned char *data = reply + FS_HEADER;
for (k= 0; k < cols; ++k) {
memcpy(data, bindings[k]->data, bindings[k]->length * 8);
data += bindings[k]->length * 8;
}
}
for (k = 0; k < cols; ++k) {
fs_rid_vector_free(bindings[k]);
}
free(bindings);
return reply;
}
static unsigned char * handle_bind_done (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "bind_done(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}