static void ngx_http_push_channel_handler(ngx_event_t *ev) {
//copypasta from os/unix/ngx_process_cycle.c (ngx_channel_handler)
ngx_int_t n;
ngx_channel_t ch;
ngx_connection_t *c;
if (ev->timedout) {
ev->timedout = 0;
return;
}
c = ev->data;
while(1) {
n = ngx_read_channel(c->fd, &ch, sizeof(ch), ev->log);
if (n == NGX_ERROR) {
if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {
ngx_del_conn(c, 0);
}
ngx_close_connection(c);
return;
}
if ((ngx_event_flags & NGX_USE_EVENTPORT_EVENT) && (ngx_add_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR)) {
return;
}
if (n == NGX_AGAIN) {
return;
}
//ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "push module: channel command: %d", ch.command);
if (ch.command==NGX_CMD_HTTP_PUSH_CHECK_MESSAGES) {
ngx_http_push_store->receive_worker_message();
}
}
}
static void
ngx_http_push_stream_channel_handler(ngx_event_t *ev)
{
// copypaste from os/unix/ngx_process_cycle.c (ngx_channel_handler)
ngx_int_t n;
ngx_channel_t ch;
ngx_connection_t *c;
if (ev->timedout) {
ev->timedout = 0;
return;
}
c = ev->data;
while (1) {
n = ngx_read_channel(c->fd, &ch, sizeof(ch), ev->log);
if (n == NGX_ERROR) {
if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {
ngx_del_conn(c, 0);
}
ngx_close_connection(c);
return;
}
if ((ngx_event_flags & NGX_USE_EVENTPORT_EVENT) && (ngx_add_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR)) {
return;
}
if (n == NGX_AGAIN) {
return;
}
if (ch.command == NGX_CMD_HTTP_PUSH_STREAM_CHECK_MESSAGES.command) {
ngx_http_push_stream_process_worker_message();
} else if (ch.command == NGX_CMD_HTTP_PUSH_STREAM_CENSUS_SUBSCRIBERS.command) {
ngx_http_push_stream_census_worker_subscribers();
} else if (ch.command == NGX_CMD_HTTP_PUSH_STREAM_DELETE_CHANNEL.command) {
ngx_http_push_stream_delete_worker_channel();
}
}
}
static void
ngx_channel_handler(ngx_event_t *ev)
{
ngx_int_t n;
ngx_channel_t ch;
ngx_connection_t *c;
if (ev->timedout) {
ev->timedout = 0;
return;
}
c = ev->data;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");
for ( ;; ) {
n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %i", n);
if (n == NGX_ERROR) {
if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {
ngx_del_conn(c, 0);
}
ngx_close_connection(c);
return;
}
if (ngx_event_flags & NGX_USE_EVENTPORT_EVENT) {
if (ngx_add_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR) {
return;
}
}
if (n == NGX_AGAIN) {
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
"channel command: %d", ch.command);
switch (ch.command) {
case NGX_CMD_QUIT:
ngx_quit = 1;
break;
case NGX_CMD_TERMINATE:
ngx_terminate = 1;
break;
case NGX_CMD_REOPEN:
ngx_reopen = 1;
break;
case NGX_CMD_OPEN_CHANNEL:
ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
"get channel s:%i pid:%P fd:%d",
ch.slot, ch.pid, ch.fd);
ngx_processes[ch.slot].pid = ch.pid;
ngx_processes[ch.slot].channel[0] = ch.fd;
break;
case NGX_CMD_CLOSE_CHANNEL:
ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
"close channel s:%i pid:%P our:%P fd:%d",
ch.slot, ch.pid, ngx_processes[ch.slot].pid,
ngx_processes[ch.slot].channel[0]);
if (close(ngx_processes[ch.slot].channel[0]) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
"close() channel failed");
}
ngx_processes[ch.slot].channel[0] = -1;
break;
}
}
}
/* 子进程收到后来新建子进程的相关信息，并根据通道的命令完成相应的动作 */
static void
ngx_channel_handler(ngx_event_t *ev)
{
ngx_int_t n;
ngx_channel_t ch;
ngx_connection_t *c;
if (ev->timedout) {
ev->timedout = 0;
return;
}
c = ev->data;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");
for ( ;; ) {
/* 从连接中的socket文件描述符中读取通道数据 */
n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %i", n);
if (n == NGX_ERROR) {
if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {
ngx_del_conn(c, 0);
}
ngx_close_connection(c);
return;
}
if (ngx_event_flags & NGX_USE_EVENTPORT_EVENT) {
if (ngx_add_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR) {
return;
}
}
if (n == NGX_AGAIN) {
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
"channel command: %d", ch.command);
switch (ch.command) {
case NGX_CMD_QUIT:
ngx_quit = 1; /* 如果worker进程通过通道接收到退出命令，则设置全局变量ngx_quit为1 */
break;
case NGX_CMD_TERMINATE:
ngx_terminate = 1;
break;
case NGX_CMD_REOPEN:
ngx_reopen = 1;
break;
/* 子进程之间的通信打开通道，如master进程将后续创建的子进程的
* pid，fd，以及slot发送过来，高速之前创建的进程怎么和后续创建的进程通信
*/
case NGX_CMD_OPEN_CHANNEL:
ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
"get channel s:%i pid:%P fd:%d",
ch.slot, ch.pid, ch.fd);
ngx_processes[ch.slot].pid = ch.pid;
/* 设置进程的0通道，在刚创建的时候，子进程的0通道是从父进程继承的 */
ngx_processes[ch.slot].channel[0] = ch.fd;
break;
case NGX_CMD_CLOSE_CHANNEL:
/* 关闭与相应进程(也就是索引为ch.slot的这个进程的通信信道 */
ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
"close channel s:%i pid:%P our:%P fd:%d",
ch.slot, ch.pid, ngx_processes[ch.slot].pid,
ngx_processes[ch.slot].channel[0]);
if (close(ngx_processes[ch.slot].channel[0]) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
"close() channel failed");
}
ngx_processes[ch.slot].channel[0] = -1;
break;
}
}
}
static void ngx_channel_handler(ngx_event_t *ev)
{
ngx_int_t n;
ngx_channel_t ch;
ngx_connection_t *c;
c = ev->data;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");
n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %d", n);
if (n <= 0) {
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
"channel command: %d", ch.command);
switch (ch.command) {
case NGX_CMD_QUIT:
ngx_quit = 1;
break;
case NGX_CMD_TERMINATE:
ngx_terminate = 1;
break;
case NGX_CMD_REOPEN:
ngx_reopen = 1;
break;
case NGX_CMD_OPEN_CHANNEL:
ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
"get channel s:%d pid:" PID_T_FMT " fd:%d",
ch.slot, ch.pid, ch.fd);
ngx_processes[ch.slot].pid = ch.pid;
ngx_processes[ch.slot].channel[0] = ch.fd;
break;
case NGX_CMD_CLOSE_CHANNEL:
ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
"close channel s:%d pid:" PID_T_FMT " our:" PID_T_FMT
" fd:%d",
ch.slot, ch.pid, ngx_processes[ch.slot].pid,
ngx_processes[ch.slot].channel[0]);
if (close(ngx_processes[ch.slot].channel[0]) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "close() failed");
}
ngx_processes[ch.slot].channel[0] = -1;
break;
}
}
