/* Unsubscribe from all the patterns. Return the number of patterns the
* client was subscribed from.
*
* 退订客户端 c 订阅的所有模式。
*
* 返回被退订模式的数量。
*/
int pubsubUnsubscribeAllPatterns(redisClient *c, int notify) {
listNode *ln;
listIter li;
int count = 0;
// 迭代客户端订阅模式的链表
listRewind(c->pubsub_patterns,&li);
while ((ln = listNext(&li)) != NULL) {
robj *pattern = ln->value;
// 退订，并计算退订数
count += pubsubUnsubscribePattern(c,pattern,notify);
}
// 如果在执行这个函数时，客户端没有订阅任何模式，
// 那么向客户端发送回复
if (notify && count == 0) {
/* We were subscribed to nothing? Still reply to the client. */
addReply(c,shared.mbulkhdr[3]);
addReply(c,shared.punsubscribebulk);
addReply(c,shared.nullbulk);
addReplyLongLong(c,dictSize(c->pubsub_channels)+
listLength(c->pubsub_patterns));
}
// 退订总数
return count;
}
/* 取消客户端所订阅的所有模式，最后返回退订的模式数量 */
int pubsubUnsubscribeAllPatterns(redisClient *c, int notify) {
listNode *ln;
listIter li;
int count = 0;
// 获取c->pubsub_patterns链表迭代器
listRewind(c->pubsub_patterns,&li);
// 遍历客户端订阅的模式链表，逐一退订
while ((ln = listNext(&li)) != NULL) {
robj *pattern = ln->value;
// 统计退订的模式数量
count += pubsubUnsubscribePattern(c,pattern,notify);
}
// 如果count == 0，说明客户端没有订阅任何模式，回复客户端
if (notify && count == 0) {
/* We were subscribed to nothing? Still reply to the client. */
addReply(c,shared.mbulkhdr[3]);
addReply(c,shared.punsubscribebulk);
addReply(c,shared.nullbulk);
addReplyLongLong(c,dictSize(c->pubsub_channels)+
listLength(c->pubsub_patterns));
}
return count;
}
void punsubscribeCommand(redisClient *c) {
if (c->argc == 1) {
pubsubUnsubscribeAllPatterns(c,1);
} else {
int j;
for (j = 1; j < c->argc; j++)
pubsubUnsubscribePattern(c,c->argv[j],1);
}
}
void punsubscribeCommand(client *c) {
if (c->argc == 1) {
pubsubUnsubscribeAllPatterns(c,1);
} else {
int j;
for (j = 1; j < c->argc; j++)
pubsubUnsubscribePattern(c,c->argv[j],1);
}
if (clientSubscriptionsCount(c) == 0) c->flags &= ~CLIENT_PUBSUB;
}
/* Unsubscribe from all the patterns. Return the number of patterns the
* client was subscribed from. */
int pubsubUnsubscribeAllPatterns(redisClient *c, int notify) {
listNode *ln;
listIter li;
int count = 0;
listRewind(c->pubsub_patterns,&li);
while ((ln = listNext(&li)) != NULL) {
robj *pattern = ln->value;
count += pubsubUnsubscribePattern(c,pattern,notify);
}
return count;
}
/* Unsubscribe from all the patterns. Return the number of patterns the
* client was subscribed from. */
int pubsubUnsubscribeAllPatterns(client *c, int notify) {
listNode *ln;
listIter li;
int count = 0;
listRewind(c->pubsub_patterns,&li);
while ((ln = listNext(&li)) != NULL) {
robj *pattern = ln->value;
count += pubsubUnsubscribePattern(c,pattern,notify);
}
if (notify && count == 0) {
/* We were subscribed to nothing? Still reply to the client. */
addReply(c,shared.mbulkhdr[3]);
addReply(c,shared.punsubscribebulk);
addReply(c,shared.nullbulk);
addReplyLongLong(c,dictSize(c->pubsub_channels)+
listLength(c->pubsub_patterns));
}
return count;
}
