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nginx-push-stream-module
Commit 5b8b865c authored by Wandenberg Peixoto's avatar Wandenberg Peixoto
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simplifying the relation between subscription (subscriber <-> channel) and worker structures

parent 571f222f
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Showing with 40 additions and 60 deletions
include/ngx_http_push_stream_module.h
View file @ 5b8b865c
......@@ -123,7 +123,7 @@ typedef struct {
ngx_queue_t queue;
pid_t pid;
ngx_int_t slot;
ngx_http_push_stream_queue_elem_t subscribers_sentinel;
ngx_queue_t subscriptions_queue;
} ngx_http_push_stream_pid_queue_t;
// our typecast-friendly rbtree node (channel)
......@@ -157,9 +157,9 @@ typedef struct {
typedef struct {
ngx_queue_t queue;
ngx_queue_t channel_worker_queue;
ngx_http_push_stream_subscriber_t *subscriber;
ngx_http_push_stream_channel_t *channel;
ngx_http_push_stream_queue_elem_t *channel_subscriber_element_ref;
} ngx_http_push_stream_subscription_t;
struct ngx_http_push_stream_subscriber_s {
......@@ -188,7 +188,7 @@ typedef struct {
ngx_http_push_stream_msg_t *msg; // ->shared memory
ngx_pid_t pid;
ngx_http_push_stream_channel_t *channel; // ->shared memory
ngx_http_push_stream_queue_elem_t *subscribers_sentinel; // ->a worker's local pool
ngx_queue_t *subscriptions_sentinel; // ->a worker's local pool
} ngx_http_push_stream_worker_msg_t;
typedef struct {
......
include/ngx_http_push_stream_module_ipc.h
View file @ 5b8b865c
......@@ -56,7 +56,7 @@ static ngx_int_t ngx_http_push_stream_alert_worker(ngx_pid_t pid, ngx_int
#define ngx_http_push_stream_alert_worker_census_subscribers(pid, slot, log) ngx_http_push_stream_alert_worker(pid, slot, log, NGX_CMD_HTTP_PUSH_STREAM_CENSUS_SUBSCRIBERS)
#define ngx_http_push_stream_alert_worker_delete_channel(pid, slot, log) ngx_http_push_stream_alert_worker(pid, slot, log, NGX_CMD_HTTP_PUSH_STREAM_DELETE_CHANNEL)
static ngx_int_t ngx_http_push_stream_send_worker_message_locked(ngx_http_push_stream_channel_t *channel, ngx_http_push_stream_queue_elem_t *subscribers_sentinel, ngx_pid_t pid, ngx_int_t worker_slot, ngx_http_push_stream_msg_t *msg, ngx_flag_t *queue_was_empty, ngx_log_t *log);
static ngx_int_t ngx_http_push_stream_send_worker_message_locked(ngx_http_push_stream_channel_t *channel, ngx_queue_t *subscriptions_sentinel, ngx_pid_t pid, ngx_int_t worker_slot, ngx_http_push_stream_msg_t *msg, ngx_flag_t *queue_was_empty, ngx_log_t *log);
static ngx_int_t ngx_http_push_stream_init_ipc(ngx_cycle_t *cycle, ngx_int_t workers);
static void ngx_http_push_stream_ipc_exit_worker(ngx_cycle_t *cycle);
......@@ -67,6 +67,6 @@ static void ngx_http_push_stream_channel_handler(ngx_event_t *ev);
static ngx_inline void ngx_http_push_stream_process_worker_message(void);
static ngx_inline void ngx_http_push_stream_census_worker_subscribers(void);
static ngx_int_t ngx_http_push_stream_respond_to_subscribers(ngx_http_push_stream_channel_t *channel, ngx_http_push_stream_queue_elem_t *subscribers_sentinel, ngx_http_push_stream_msg_t *msg);
static ngx_int_t ngx_http_push_stream_respond_to_subscribers(ngx_http_push_stream_channel_t *channel, ngx_queue_t *subscriptions_sentinel, ngx_http_push_stream_msg_t *msg);
#endif /* NGX_HTTP_PUSH_STREAM_MODULE_IPC_H_ */
src/ngx_http_push_stream_module_ipc.c
View file @ 5b8b865c
......@@ -298,7 +298,7 @@ ngx_http_push_stream_process_worker_message(void)
worker_msg = ngx_queue_data(cur, ngx_http_push_stream_worker_msg_t, queue);
if (worker_msg->pid == ngx_pid) {
// everything is okay
ngx_http_push_stream_respond_to_subscribers(worker_msg->channel, worker_msg->subscribers_sentinel, worker_msg->msg);
ngx_http_push_stream_respond_to_subscribers(worker_msg->channel, worker_msg->subscriptions_sentinel, worker_msg->msg);
} else {
// that's quite bad you see. a previous worker died with an undelivered message.
// but all its subscribers' connections presumably got canned, too. so it's not so bad after all.
......@@ -332,7 +332,7 @@ ngx_http_push_stream_process_worker_message(void)
static ngx_int_t
ngx_http_push_stream_send_worker_message_locked(ngx_http_push_stream_channel_t *channel, ngx_http_push_stream_queue_elem_t *subscribers_sentinel, ngx_pid_t pid, ngx_int_t worker_slot, ngx_http_push_stream_msg_t *msg, ngx_flag_t *queue_was_empty, ngx_log_t *log)
ngx_http_push_stream_send_worker_message_locked(ngx_http_push_stream_channel_t *channel, ngx_queue_t *subscriptions_sentinel, ngx_pid_t pid, ngx_int_t worker_slot, ngx_http_push_stream_msg_t *msg, ngx_flag_t *queue_was_empty, ngx_log_t *log)
{
ngx_slab_pool_t *shpool = (ngx_slab_pool_t *) ngx_http_push_stream_shm_zone->shm.addr;
ngx_http_push_stream_worker_data_t *workers_data = ((ngx_http_push_stream_shm_data_t *) ngx_http_push_stream_shm_zone->data)->ipc;
......@@ -347,7 +347,7 @@ ngx_http_push_stream_send_worker_message_locked(ngx_http_push_stream_channel_t *
msg->workers_ref_count++;
newmessage->msg = msg;
newmessage->pid = pid;
newmessage->subscribers_sentinel = subscribers_sentinel;
newmessage->subscriptions_sentinel = subscriptions_sentinel;
newmessage->channel = channel;
*queue_was_empty = ngx_queue_empty(&thisworker_data->messages_queue);
ngx_queue_insert_tail(&thisworker_data->messages_queue, &newmessage->queue);
......@@ -370,7 +370,7 @@ ngx_http_push_stream_broadcast(ngx_http_push_stream_channel_t *channel, ngx_http
cur_worker = &channel->workers_with_subscribers;
while ((cur_worker = ngx_queue_next(cur_worker)) && (cur_worker != NULL) && (cur_worker != &channel->workers_with_subscribers)) {
worker = ngx_queue_data(cur_worker, ngx_http_push_stream_pid_queue_t, queue);
ngx_http_push_stream_send_worker_message_locked(channel, &worker->subscribers_sentinel, worker->pid, worker->slot, msg, &queue_was_empty[worker->slot], log);
ngx_http_push_stream_send_worker_message_locked(channel, &worker->subscriptions_queue, worker->pid, worker->slot, msg, &queue_was_empty[worker->slot], log);
}
ngx_shmtx_unlock(&shpool->mutex);
......@@ -391,22 +391,21 @@ ngx_http_push_stream_broadcast(ngx_http_push_stream_channel_t *channel, ngx_http
}
static ngx_int_t
ngx_http_push_stream_respond_to_subscribers(ngx_http_push_stream_channel_t *channel, ngx_http_push_stream_queue_elem_t *subscribers_sentinel, ngx_http_push_stream_msg_t *msg)
ngx_http_push_stream_respond_to_subscribers(ngx_http_push_stream_channel_t *channel, ngx_queue_t *subscriptions_sentinel, ngx_http_push_stream_msg_t *msg)
{
ngx_http_push_stream_queue_elem_t *cur = subscribers_sentinel;
ngx_queue_t *cur = subscriptions_sentinel, *prev = NULL;
if (subscribers_sentinel == NULL) {
if (subscriptions_sentinel == NULL) {
return NGX_ERROR;
}
if (msg != NULL) {
// now let's respond to some requests!
while ((cur = (ngx_http_push_stream_queue_elem_t *) ngx_queue_next(&cur->queue)) != subscribers_sentinel) {
ngx_http_push_stream_subscriber_t *subscriber = (ngx_http_push_stream_subscriber_t *) cur->value;
while (((cur = ngx_queue_next(cur)) != subscriptions_sentinel) && (prev = ngx_queue_prev(cur))) {
ngx_http_push_stream_subscription_t *subscription = ngx_queue_data(cur, ngx_http_push_stream_subscription_t, channel_worker_queue);
ngx_http_push_stream_subscriber_t *subscriber = subscription->subscriber;
if (subscriber->longpolling) {
ngx_http_push_stream_queue_elem_t *prev = (ngx_http_push_stream_queue_elem_t *) ngx_queue_prev(&cur->queue);
ngx_http_push_stream_add_response_header(subscriber->request, &NGX_HTTP_PUSH_STREAM_HEADER_TRANSFER_ENCODING, &NGX_HTTP_PUSH_STREAM_HEADER_CHUNCKED);
ngx_http_push_stream_add_polling_headers(subscriber->request, msg->time, msg->tag, subscriber->request->pool);
ngx_http_send_header(subscriber->request);
......@@ -418,7 +417,6 @@ ngx_http_push_stream_respond_to_subscribers(ngx_http_push_stream_channel_t *chan
cur = prev;
} else {
if (ngx_http_push_stream_send_response_message(subscriber->request, channel, msg, 0, 0) != NGX_OK) {
ngx_http_push_stream_queue_elem_t *prev = (ngx_http_push_stream_queue_elem_t *) ngx_queue_prev(&cur->queue);
ngx_http_push_stream_send_response_finalize(subscriber->request);
cur = prev;
} else {
......
src/ngx_http_push_stream_module_subscriber.c
View file @ 5b8b865c
......@@ -660,7 +660,7 @@ ngx_http_push_stream_create_worker_subscriber_channel_sentinel_locked(ngx_slab_p
worker_sentinel->pid = ngx_pid;
worker_sentinel->slot = ngx_process_slot;
ngx_queue_init(&worker_sentinel->subscribers_sentinel.queue);
ngx_queue_init(&worker_sentinel->subscriptions_queue);
return worker_sentinel;
}
......@@ -687,7 +687,6 @@ ngx_http_push_stream_assing_subscription_to_channel_locked(ngx_slab_pool_t *shpo
ngx_queue_t *cur_worker;
ngx_http_push_stream_pid_queue_t *worker, *worker_subscribers_sentinel = NULL;
ngx_http_push_stream_channel_t *channel;
ngx_http_push_stream_queue_elem_t *element_subscriber;
// check if channel still exists
if ((channel = ngx_http_push_stream_find_channel(channel_id, log)) == NULL) {
......@@ -711,17 +710,10 @@ ngx_http_push_stream_assing_subscription_to_channel_locked(ngx_slab_pool_t *shpo
}
}
if ((element_subscriber = ngx_palloc(subscription->subscriber->request->pool, sizeof(ngx_http_push_stream_queue_elem_t))) == NULL) { // unable to allocate request queue element
ngx_log_error(NGX_LOG_ERR, log, 0, "push stream module: unable to allocate subscriber reference");
return NGX_ERROR;
}
element_subscriber->value = subscription->subscriber;
subscription->channel_subscriber_element_ref = element_subscriber;
channel->subscribers++; // do this only when we know everything went okay
channel->last_activity_time = ngx_time();
ngx_queue_insert_tail(&subscriptions_sentinel->queue, &subscription->queue);
ngx_queue_insert_tail(&worker_subscribers_sentinel->subscribers_sentinel.queue, &element_subscriber->queue);
ngx_queue_insert_tail(&worker_subscribers_sentinel->subscriptions_queue, &subscription->channel_worker_queue);
return NGX_OK;
}
......
src/ngx_http_push_stream_module_utils.c
View file @ 5b8b865c
......@@ -62,9 +62,7 @@ ngx_http_push_stream_delete_channels(ngx_http_push_stream_shm_data_t *data, ngx_
{
ngx_http_push_stream_channel_t *channel;
ngx_http_push_stream_pid_queue_t *worker;
ngx_queue_t *cur_worker;
ngx_http_push_stream_queue_elem_t *cur;
ngx_http_push_stream_subscription_t *cur_subscription;
ngx_queue_t *cur_worker, *cur;
ngx_queue_t *prev_channel, *cur_channel = &data->channels_to_delete;
......@@ -84,22 +82,17 @@ ngx_http_push_stream_delete_channels(ngx_http_push_stream_shm_data_t *data, ngx_
worker = ngx_queue_data(cur_worker, ngx_http_push_stream_pid_queue_t, queue);
if (worker->pid == ngx_pid) {
// to each subscriber of this channel in this worker
while (!ngx_queue_empty(&worker->subscribers_sentinel.queue)) {
cur = (ngx_http_push_stream_queue_elem_t *) ngx_queue_next(&worker->subscribers_sentinel.queue);
ngx_http_push_stream_subscriber_t *subscriber = (ngx_http_push_stream_subscriber_t *) cur->value;
// find the subscription for the channel being deleted
cur_subscription = &subscriber->subscriptions_sentinel;
while ((cur_subscription = (ngx_http_push_stream_subscription_t *) ngx_queue_next(&cur_subscription->queue)) != &subscriber->subscriptions_sentinel) {
if (cur_subscription->channel == channel) {
// to each subscription of this channel in this worker
while ((cur = ngx_queue_head(&worker->subscriptions_queue)) != &worker->subscriptions_queue) {
ngx_http_push_stream_subscription_t *subscription = ngx_queue_data(cur, ngx_http_push_stream_subscription_t, channel_worker_queue);
ngx_http_push_stream_subscriber_t *subscriber = subscription->subscriber;
ngx_shmtx_lock(&shpool->mutex);
NGX_HTTP_PUSH_STREAM_DECREMENT_COUNTER(channel->subscribers);
// remove the reference from subscription for channel
ngx_queue_remove(&cur_subscription->queue);
// remove the reference from channel for subscriber
ngx_queue_remove(&cur->queue);
// remove the subscription for the channel from subscriber
ngx_queue_remove(&subscription->queue);
// remove the subscription for the channel from worker
ngx_queue_remove(&subscription->channel_worker_queue);
ngx_shmtx_unlock(&shpool->mutex);
if (subscriber->longpolling) {
......@@ -112,9 +105,6 @@ ngx_http_push_stream_delete_channels(ngx_http_push_stream_shm_data_t *data, ngx_
ngx_http_push_stream_send_response_message(subscriber->request, channel, channel->channel_deleted_message, 1, 1);
break;
}
}
// subscriber does not have any other subscription, the connection may be closed
if (subscriber->longpolling || ngx_queue_empty(&subscriber->subscriptions_sentinel.queue)) {
......@@ -1174,7 +1164,7 @@ ngx_http_push_stream_worker_subscriber_cleanup_locked(ngx_http_push_stream_subsc
while ((cur = (ngx_http_push_stream_subscription_t *) ngx_queue_next(&sentinel->queue)) != sentinel) {
NGX_HTTP_PUSH_STREAM_DECREMENT_COUNTER(cur->channel->subscribers);
cur->channel->last_activity_time = ngx_time();
ngx_queue_remove(&cur->channel_subscriber_element_ref->queue);
ngx_queue_remove(&cur->channel_worker_queue);
ngx_queue_remove(&cur->queue);
}
ngx_queue_init(&sentinel->queue);
......
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