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/*
* Copyright (c) 2021, Red Hat, Inc.
*
* 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 "transaction-forward.h"
#include "coverage.h"
#include "jsonrpc.h"
#include "openvswitch/hmap.h"
#include "openvswitch/json.h"
#include "openvswitch/list.h"
#include "openvswitch/poll-loop.h"
#include "openvswitch/vlog.h"
#include "ovsdb.h"
#include "ovsdb-cs.h"
#include "util.h"
VLOG_DEFINE_THIS_MODULE(transaction_forward);
COVERAGE_DEFINE(txn_forward_cancel);
COVERAGE_DEFINE(txn_forward_complete);
COVERAGE_DEFINE(txn_forward_create);
COVERAGE_DEFINE(txn_forward_sent);
struct ovsdb_txn_forward {
struct ovs_list new_node; /* In 'txn_forward_new' of struct ovsdb. */
struct hmap_node sent_node; /* In 'txn_forward_sent' of struct ovsdb. */
struct json *id; /* 'id' of the forwarded transaction. */
struct jsonrpc_msg *request; /* Original request. */
struct jsonrpc_msg *reply; /* Reply from the server. */
};
struct ovsdb_txn_forward *
ovsdb_txn_forward_create(struct ovsdb *db, const struct jsonrpc_msg *request)
{
struct ovsdb_txn_forward *txn_fwd = xzalloc(sizeof *txn_fwd);
COVERAGE_INC(txn_forward_create);
txn_fwd->request = jsonrpc_msg_clone(request);
ovs_list_push_back(&db->txn_forward_new, &txn_fwd->new_node);
hmap_node_nullify(&txn_fwd->sent_node);
return txn_fwd;
}
static void
ovsdb_txn_forward_unlist(struct ovsdb *db, struct ovsdb_txn_forward *txn_fwd)
{
if (!ovs_list_is_empty(&txn_fwd->new_node)) {
ovs_list_remove(&txn_fwd->new_node);
ovs_list_init(&txn_fwd->new_node);
}
if (!hmap_node_is_null(&txn_fwd->sent_node)) {
hmap_remove(&db->txn_forward_sent, &txn_fwd->sent_node);
hmap_node_nullify(&txn_fwd->sent_node);
}
}
void
ovsdb_txn_forward_destroy(struct ovsdb *db, struct ovsdb_txn_forward *txn_fwd)
{
if (!txn_fwd) {
return;
}
ovsdb_txn_forward_unlist(db, txn_fwd);
json_destroy(txn_fwd->id);
jsonrpc_msg_destroy(txn_fwd->request);
jsonrpc_msg_destroy(txn_fwd->reply);
free(txn_fwd);
}
bool
ovsdb_txn_forward_is_complete(const struct ovsdb_txn_forward *txn_fwd)
{
return txn_fwd->reply != NULL;
}
void
ovsdb_txn_forward_complete(struct ovsdb *db, const struct jsonrpc_msg *reply)
{
struct ovsdb_txn_forward *t;
size_t hash = json_hash(reply->id, 0);
HMAP_FOR_EACH_WITH_HASH (t, sent_node, hash, &db->txn_forward_sent) {
if (json_equal(reply->id, t->id)) {
COVERAGE_INC(txn_forward_complete);
t->reply = jsonrpc_msg_clone(reply);
/* Replacing id with the id of the original request. */
json_destroy(t->reply->id);
t->reply->id = json_clone(t->request->id);
hmap_remove(&db->txn_forward_sent, &t->sent_node);
hmap_node_nullify(&t->sent_node);
db->run_triggers_now = db->run_triggers = true;
return;
}
}
}
struct jsonrpc_msg *
ovsdb_txn_forward_steal_reply(struct ovsdb_txn_forward *txn_fwd)
{
struct jsonrpc_msg *reply = txn_fwd->reply;
txn_fwd->reply = NULL;
return reply;
}
void
ovsdb_txn_forward_run(struct ovsdb *db, struct ovsdb_cs *cs)
{
struct ovsdb_txn_forward *t;
/* Send all transactions that needs to be forwarded. */
LIST_FOR_EACH_SAFE (t, new_node, &db->txn_forward_new) {
if (!ovsdb_cs_may_send_transaction(cs)) {
break;
}
ovs_assert(!strcmp(t->request->method, "transact"));
t->id = ovsdb_cs_send_transaction(cs, json_clone(t->request->params));
if (t->id) {
COVERAGE_INC(txn_forward_sent);
ovs_list_remove(&t->new_node);
ovs_list_init(&t->new_node);
hmap_insert(&db->txn_forward_sent, &t->sent_node,
json_hash(t->id, 0));
}
}
}
void
ovsdb_txn_forward_wait(struct ovsdb *db, struct ovsdb_cs *cs)
{
if (ovsdb_cs_may_send_transaction(cs)
&& !ovs_list_is_empty(&db->txn_forward_new)) {
poll_immediate_wake();
}
}
void
ovsdb_txn_forward_cancel(struct ovsdb *db, struct ovsdb_txn_forward *txn_fwd)
{
COVERAGE_INC(txn_forward_cancel);
jsonrpc_msg_destroy(txn_fwd->reply);
txn_fwd->reply = jsonrpc_create_error(json_string_create("canceled"),
txn_fwd->request->id);
ovsdb_txn_forward_unlist(db, txn_fwd);
}
void
ovsdb_txn_forward_cancel_all(struct ovsdb *db, bool sent_only)
{
struct ovsdb_txn_forward *t;
HMAP_FOR_EACH_SAFE (t, sent_node, &db->txn_forward_sent) {
ovsdb_txn_forward_cancel(db, t);
}
if (sent_only) {
return;
}
LIST_FOR_EACH_SAFE (t, new_node, &db->txn_forward_new) {
ovsdb_txn_forward_cancel(db, t);
}
}
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