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row.c
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row.c
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/* Copyright (c) 2009 Nicira Networks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "row.h"
#include <assert.h>
#include <stddef.h>
#include "json.h"
#include "ovsdb-error.h"
#include "shash.h"
#include "sort.h"
#include "table.h"
static struct ovsdb_row *
allocate_row(const struct ovsdb_table *table)
{
size_t n_fields = shash_count(&table->schema->columns);
size_t row_size = (offsetof(struct ovsdb_row, fields)
+ sizeof(struct ovsdb_datum) * n_fields);
struct ovsdb_row *row = xmalloc(row_size);
row->table = (struct ovsdb_table *) table;
row->txn_row = NULL;
return row;
}
struct ovsdb_row *
ovsdb_row_create(const struct ovsdb_table *table)
{
struct shash_node *node;
struct ovsdb_row *row;
row = allocate_row(table);
SHASH_FOR_EACH (node, &table->schema->columns) {
const struct ovsdb_column *column = node->data;
ovsdb_datum_init_default(&row->fields[column->index], &column->type);
}
return row;
}
struct ovsdb_row *
ovsdb_row_clone(const struct ovsdb_row *old)
{
const struct ovsdb_table *table = old->table;
const struct shash_node *node;
struct ovsdb_row *new;
new = allocate_row(table);
SHASH_FOR_EACH (node, &table->schema->columns) {
const struct ovsdb_column *column = node->data;
ovsdb_datum_clone(&new->fields[column->index],
&old->fields[column->index],
&column->type);
}
return new;
}
/* The caller is responsible for ensuring that 'row' has been removed from its
* table and that it is not participating in a transaction. */
void
ovsdb_row_destroy(struct ovsdb_row *row)
{
if (row) {
const struct ovsdb_table *table = row->table;
const struct shash_node *node;
SHASH_FOR_EACH (node, &table->schema->columns) {
const struct ovsdb_column *column = node->data;
ovsdb_datum_destroy(&row->fields[column->index], &column->type);
}
free(row);
}
}
uint32_t
ovsdb_row_hash_columns(const struct ovsdb_row *row,
const struct ovsdb_column_set *columns,
uint32_t basis)
{
size_t i;
for (i = 0; i < columns->n_columns; i++) {
const struct ovsdb_column *column = columns->columns[i];
basis = ovsdb_datum_hash(&row->fields[column->index], &column->type,
basis);
}
return basis;
}
int
ovsdb_row_compare_columns_3way(const struct ovsdb_row *a,
const struct ovsdb_row *b,
const struct ovsdb_column_set *columns)
{
size_t i;
for (i = 0; i < columns->n_columns; i++) {
const struct ovsdb_column *column = columns->columns[i];
int cmp = ovsdb_datum_compare_3way(&a->fields[column->index],
&b->fields[column->index],
&column->type);
if (cmp) {
return cmp;
}
}
return 0;
}
bool
ovsdb_row_equal_columns(const struct ovsdb_row *a,
const struct ovsdb_row *b,
const struct ovsdb_column_set *columns)
{
size_t i;
for (i = 0; i < columns->n_columns; i++) {
const struct ovsdb_column *column = columns->columns[i];
if (!ovsdb_datum_equals(&a->fields[column->index],
&b->fields[column->index],
&column->type)) {
return false;
}
}
return true;
}
void
ovsdb_row_update_columns(struct ovsdb_row *dst,
const struct ovsdb_row *src,
const struct ovsdb_column_set *columns)
{
size_t i;
for (i = 0; i < columns->n_columns; i++) {
const struct ovsdb_column *column = columns->columns[i];
ovsdb_datum_destroy(&dst->fields[column->index], &column->type);
ovsdb_datum_clone(&dst->fields[column->index],
&src->fields[column->index],
&column->type);
}
}
struct ovsdb_error *
ovsdb_row_from_json(struct ovsdb_row *row, const struct json *json,
const struct ovsdb_symbol_table *symtab,
struct ovsdb_column_set *included)
{
struct ovsdb_table_schema *schema = row->table->schema;
struct ovsdb_error *error;
struct shash_node *node;
if (json->type != JSON_OBJECT) {
return ovsdb_syntax_error(json, NULL, "row must be JSON object");
}
SHASH_FOR_EACH (node, json_object(json)) {
const char *column_name = node->name;
const struct ovsdb_column *column;
struct ovsdb_datum datum;
column = ovsdb_table_schema_get_column(schema, column_name);
if (!column) {
return ovsdb_syntax_error(json, "unknown column",
"No column %s in table %s.",
column_name, schema->name);
}
error = ovsdb_datum_from_json(&datum, &column->type, node->data,
symtab);
if (error) {
return error;
}
ovsdb_datum_swap(&row->fields[column->index], &datum);
ovsdb_datum_destroy(&datum, &column->type);
if (included) {
ovsdb_column_set_add(included, column);
}
}
return NULL;
}
static void
put_json_column(struct json *object, const struct ovsdb_row *row,
const struct ovsdb_column *column)
{
json_object_put(object, column->name,
ovsdb_datum_to_json(&row->fields[column->index],
&column->type));
}
struct json *
ovsdb_row_to_json(const struct ovsdb_row *row,
const struct ovsdb_column_set *columns)
{
struct json *json;
size_t i;
json = json_object_create();
for (i = 0; i < columns->n_columns; i++) {
put_json_column(json, row, columns->columns[i]);
}
return json;
}
void
ovsdb_row_set_init(struct ovsdb_row_set *set)
{
set->rows = NULL;
set->n_rows = set->allocated_rows = 0;
}
void
ovsdb_row_set_destroy(struct ovsdb_row_set *set)
{
free(set->rows);
}
void
ovsdb_row_set_add_row(struct ovsdb_row_set *set, const struct ovsdb_row *row)
{
if (set->n_rows >= set->allocated_rows) {
set->rows = x2nrealloc(set->rows, &set->allocated_rows,
sizeof *set->rows);
}
set->rows[set->n_rows++] = row;
}
struct json *
ovsdb_row_set_to_json(const struct ovsdb_row_set *rows,
const struct ovsdb_column_set *columns)
{
struct json **json_rows;
size_t i;
json_rows = xmalloc(rows->n_rows * sizeof *json_rows);
for (i = 0; i < rows->n_rows; i++) {
json_rows[i] = ovsdb_row_to_json(rows->rows[i], columns);
}
return json_array_create(json_rows, rows->n_rows);
}
struct ovsdb_row_set_sort_cbdata {
struct ovsdb_row_set *set;
const struct ovsdb_column_set *columns;
};
static int
ovsdb_row_set_sort_compare_cb(size_t a, size_t b, void *cbdata_)
{
struct ovsdb_row_set_sort_cbdata *cbdata = cbdata_;
return ovsdb_row_compare_columns_3way(cbdata->set->rows[a],
cbdata->set->rows[b],
cbdata->columns);
}
static void
ovsdb_row_set_sort_swap_cb(size_t a, size_t b, void *cbdata_)
{
struct ovsdb_row_set_sort_cbdata *cbdata = cbdata_;
const struct ovsdb_row *tmp = cbdata->set->rows[a];
cbdata->set->rows[a] = cbdata->set->rows[b];
cbdata->set->rows[b] = tmp;
}
void
ovsdb_row_set_sort(struct ovsdb_row_set *set,
const struct ovsdb_column_set *columns)
{
if (columns && columns->n_columns && set->n_rows > 1) {
struct ovsdb_row_set_sort_cbdata cbdata;
cbdata.set = set;
cbdata.columns = columns;
sort(set->n_rows,
ovsdb_row_set_sort_compare_cb,
ovsdb_row_set_sort_swap_cb,
&cbdata);
}
}
void
ovsdb_row_hash_init(struct ovsdb_row_hash *rh,
const struct ovsdb_column_set *columns)
{
hmap_init(&rh->rows);
ovsdb_column_set_clone(&rh->columns, columns);
}
void
ovsdb_row_hash_destroy(struct ovsdb_row_hash *rh, bool destroy_rows)
{
struct ovsdb_row_hash_node *node, *next;
HMAP_FOR_EACH_SAFE (node, next, struct ovsdb_row_hash_node, hmap_node,
&rh->rows) {
hmap_remove(&rh->rows, &node->hmap_node);
if (destroy_rows) {
ovsdb_row_destroy((struct ovsdb_row *) node->row);
}
free(node);
}
hmap_destroy(&rh->rows);
ovsdb_column_set_destroy(&rh->columns);
}
size_t
ovsdb_row_hash_count(const struct ovsdb_row_hash *rh)
{
return hmap_count(&rh->rows);
}
bool
ovsdb_row_hash_contains(const struct ovsdb_row_hash *rh,
const struct ovsdb_row *row)
{
size_t hash = ovsdb_row_hash_columns(row, &rh->columns, 0);
return ovsdb_row_hash_contains__(rh, row, hash);
}
/* Returns true if every row in 'b' has an equal row in 'a'. */
bool
ovsdb_row_hash_contains_all(const struct ovsdb_row_hash *a,
const struct ovsdb_row_hash *b)
{
struct ovsdb_row_hash_node *node;
assert(ovsdb_column_set_equals(&a->columns, &b->columns));
HMAP_FOR_EACH (node, struct ovsdb_row_hash_node, hmap_node, &b->rows) {
if (!ovsdb_row_hash_contains__(a, node->row, node->hmap_node.hash)) {
return false;
}
}
return true;
}
bool
ovsdb_row_hash_insert(struct ovsdb_row_hash *rh, const struct ovsdb_row *row)
{
size_t hash = ovsdb_row_hash_columns(row, &rh->columns, 0);
return ovsdb_row_hash_insert__(rh, row, hash);
}
bool
ovsdb_row_hash_contains__(const struct ovsdb_row_hash *rh,
const struct ovsdb_row *row, size_t hash)
{
struct ovsdb_row_hash_node *node;
HMAP_FOR_EACH_WITH_HASH (node, struct ovsdb_row_hash_node, hmap_node,
hash, &rh->rows) {
if (ovsdb_row_equal_columns(row, node->row, &rh->columns)) {
return true;
}
}
return false;
}
bool
ovsdb_row_hash_insert__(struct ovsdb_row_hash *rh, const struct ovsdb_row *row,
size_t hash)
{
if (!ovsdb_row_hash_contains__(rh, row, hash)) {
struct ovsdb_row_hash_node *node = xmalloc(sizeof *node);
node->row = row;
hmap_insert(&rh->rows, &node->hmap_node, hash);
return true;
} else {
return false;
}
}