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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright 2012 Couchbase, 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 "internal.h"

struct observe_cookie {
struct observe_entry *entries;
int num;
lcb_error_t error;
};

static void simple_observe_callback(lcb_t instance,
const void *cookie,
lcb_error_t error,
const lcb_observe_resp_t *resp)
{
struct observe_cookie *c = (struct observe_cookie *)cookie;
struct observe_entry *ent = NULL;
int ii;

if (resp->version != 0) {
c->error = LCB_EINVAL;
}

if (c->error != LCB_SUCCESS) {
/*
* if we've gotten any incorrect version responses we'll just
* ditch all of them
*/
return ;
}

/* Is this the terminating packet? */
if (resp->v.v0.nkey == 0) {
return;
}

/* let's find the correct entry */
for (ii = 0; ii < c->num; ++ii) {
if ((c->entries[ii].nkey == resp->v.v0.nkey) &&
memcmp(c->entries[ii].key, resp->v.v0.key, resp->v.v0.nkey) == 0) {
ent = &c->entries[ii];
}
}

if (ent == NULL) {
/* This shouldn't happen.. the server sent a key we didn't request! */
c->error = LCB_ERROR;
return;
}

ent->err = error;
if (error == LCB_SUCCESS) {
if (ent->cas != resp->v.v0.cas) {
/*
*It's only mutated if it is from the master (if not it may
* be data from the previous version of the key
*/
if (resp->v.v0.from_master) {
ent->mutated = 1;
}
} else {
/* This is the correct object */
if (resp->v.v0.from_master == 0) {
if ((resp->v.v0.status & LCB_OBSERVE_NOT_FOUND) == 0) {
ent->replicated++;
}
}

if (resp->v.v0.status & LCB_OBSERVE_PERSISTED) {
ent->persisted++;
}
}
}
}

static int should_add(struct observe_entry *entries,
long persist_to,
long replicate_to)
{
int ret = 0;
if (entries->mutated == 0) {
if (entries->persisted < persist_to) {
ret++;
}
if (entries->replicated < replicate_to) {
ret++;
}

if (ret) {
/* reset the counters */
entries->persisted = 0;
entries->replicated = 0;
}
}

return ret;
}

PHP_COUCHBASE_LOCAL
lcb_error_t simple_observe(lcb_t instance,
struct observe_entry *entries,
int nentries,
long persist_to,
long replicate_to)
{
lcb_error_t err = LCB_SUCCESS;
lcb_observe_cmd_t *cmds = ecalloc(nentries, sizeof(lcb_observe_cmd_t));
lcb_observe_cmd_t **commands = ecalloc(nentries, sizeof(lcb_observe_cmd_t *));
int ii;
lcb_observe_callback org = lcb_set_observe_callback(instance,
simple_observe_callback);
struct observe_cookie cookie;
int xx;
int done = 0;
int numtries = 0;
int interval = INI_INT(PCBC_INIENT_OBS_INTERVAL);
int maxretry = INI_INT(PCBC_INIENT_OBS_TIMEOUT) / interval;


cookie.entries = entries;
cookie.num = nentries;
cookie.error = LCB_SUCCESS;

lcb_behavior_set_syncmode(instance, LCB_SYNCHRONOUS);

do {
/* set up the commands */
for (xx = 0, ii = 0; ii < nentries; ++ii) {
cmds[ii].v.v0.key = entries[ii].key;
cmds[ii].v.v0.nkey = entries[ii].nkey;
if (should_add(&entries[ii], persist_to, replicate_to)) {
commands[xx++] = cmds + ii;
}
}

if (xx > 0) {
if (numtries > 0) {
usleep(interval);
}
++numtries;
err = lcb_observe(instance, &cookie, xx,
(const lcb_observe_cmd_t * const *)commands);
} else {
done = 1;
}
} while (!done && numtries < maxretry);

efree(cmds);
efree(commands);

lcb_behavior_set_syncmode(instance, LCB_ASYNCHRONOUS);
lcb_set_observe_callback(instance, org);

if (!done) {
return LCB_ETIMEDOUT;
}

return (err == LCB_SUCCESS) ? cookie.error : err;
}

PHP_COUCHBASE_LOCAL
int validate_simple_observe_clause(lcb_t instance,
int persist,
int replicas TSRMLS_DC)
{
int num_replicas = lcb_get_num_replicas(instance);
int num_nodes = lcb_get_num_nodes(instance);

if ((persist > (num_replicas + 1)) || (replicas > num_replicas)) {
zend_throw_exception(cb_not_enough_nodes_exception,
"Not enough replicas to fulfill the request",
0 TSRMLS_CC);
return -1;
}

if ((persist > num_nodes) || ((replicas + 1) > num_nodes)) {
zend_throw_exception(cb_not_enough_nodes_exception,
"Not enough nodes to fulfill the request",
0 TSRMLS_CC);
return -1;
}

return 0;
}

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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