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/* Copyright (c) 2009, 2010, 2011, 2012 Nicira, 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 "trigger.h"
#include <limits.h>
#include "openvswitch/json.h"
#include "jsonrpc.h"
#include "ovsdb.h"
#include "openvswitch/poll-loop.h"
#include "server.h"
#include "util.h"
static bool ovsdb_trigger_try(struct ovsdb_trigger *, long long int now);
static void ovsdb_trigger_complete(struct ovsdb_trigger *);
void
ovsdb_trigger_init(struct ovsdb_session *session, struct ovsdb *db,
struct ovsdb_trigger *trigger,
struct json *request, long long int now,
bool read_only, const char *role,
const char *id)
{
trigger->session = session;
trigger->db = db;
ovs_list_push_back(&trigger->db->triggers, &trigger->node);
trigger->request = request;
trigger->result = NULL;
trigger->created = now;
trigger->timeout_msec = LLONG_MAX;
trigger->read_only = read_only;
trigger->role = nullable_xstrdup(role);
trigger->id = nullable_xstrdup(id);
ovsdb_trigger_try(trigger, now);
}
void
ovsdb_trigger_destroy(struct ovsdb_trigger *trigger)
{
ovs_list_remove(&trigger->node);
json_destroy(trigger->request);
json_destroy(trigger->result);
free(trigger->role);
free(trigger->id);
}
bool
ovsdb_trigger_is_complete(const struct ovsdb_trigger *trigger)
{
return trigger->result != NULL;
}
struct json *
ovsdb_trigger_steal_result(struct ovsdb_trigger *trigger)
{
struct json *result = trigger->result;
trigger->result = NULL;
return result;
}
void
ovsdb_trigger_run(struct ovsdb *db, long long int now)
{
struct ovsdb_trigger *t, *next;
bool run_triggers;
run_triggers = db->run_triggers;
db->run_triggers = false;
LIST_FOR_EACH_SAFE (t, next, node, &db->triggers) {
if (run_triggers || now - t->created >= t->timeout_msec) {
ovsdb_trigger_try(t, now);
}
}
}
void
ovsdb_trigger_wait(struct ovsdb *db, long long int now)
{
if (db->run_triggers) {
poll_immediate_wake();
} else {
long long int deadline = LLONG_MAX;
struct ovsdb_trigger *t;
LIST_FOR_EACH (t, node, &db->triggers) {
if (t->created < LLONG_MAX - t->timeout_msec) {
long long int t_deadline = t->created + t->timeout_msec;
if (deadline > t_deadline) {
deadline = t_deadline;
if (now >= deadline) {
break;
}
}
}
}
if (deadline < LLONG_MAX) {
poll_timer_wait_until(deadline);
}
}
}
static bool
ovsdb_trigger_try(struct ovsdb_trigger *t, long long int now)
{
t->result = ovsdb_execute(t->db, t->session,
t->request, t->read_only,
t->role, t->id,
now - t->created, &t->timeout_msec);
if (t->result) {
ovsdb_trigger_complete(t);
return true;
} else {
return false;
}
}
static void
ovsdb_trigger_complete(struct ovsdb_trigger *t)
{
ovs_assert(t->result != NULL);
ovs_list_remove(&t->node);
ovs_list_push_back(&t->session->completions, &t->node);
}
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