插件 – 我的nginx模块可以在主进程中建立连接吗?

我正在编写一个想要订阅zeromq pubsub套接字的nginx模块,并根据收到的消息更新内存中的数据结构.为了节省带宽,有意义的是只有一个进程应该进行订阅,并且数据结构应该是shm,以便所有进程都可以使用它.对我来说,一个进程应该是主人似乎很自然(因为如果它是一个工人,代码必须以某种方式决定哪个工人).

但是当我从init_master或init_module回调调用ngx_get_connection时,它会出现段错误,显然是由于ngx_cycle尚未初始化.谷歌搜索在主进程中工作的插件似乎非常悲观.是否有更好的方法来实现我的目标,即每个服务器与pubsub套接字建立单个传出连接,无论它有多少工作者?

这是一个在工作者上下文中工作的代码示例,但不是来自master:

void *zmq_context = zmq_ctx_new();
void *control_socket = zmq_socket(zmq_context, ZMQ_SUB);
int control_fd;
size_t fdsize = sizeof(int);
ngx_connection_t *control_connection;

zmq_connect(control_socket, "tcp://somewhere:1234");
zmq_setsockopt(control_socket, ZMQ_SUBSCRIBE, "", 0);
zmq_getsockopt(control_socket, ZMQ_FD, &control_fd, &fdsize);
control_connection = ngx_get_connection(control_fd, cycle->log);
control_connection->read->handler = my_read_handler;
control_connection->read->log = cycle->log;
ngx_add_event(control_connection->read, NGX_READ_EVENT, 0);

和其他地方

void my_read_handler (ngx_event_t *ev) {
    int events;
    size_t events_size = sizeof(events);

    zmq_getsockopt(control_socket, ZMQ_EVENTS, &events, &events_size);
    while (events & ZMQ_POLLIN) {
        /* ...
           read a message, do something with it
        ... */
        events = 0;
        zmq_getsockopt(control_socket, ZMQ_EVENTS, &events, &events_size);
    }
}

To save bandwidth, it makes sense that only one process should make the subscription, and the data structure should be in shm so that all processes can make use of it. To me it seems natural that that one process should be the master (since if it was a worker, the code would have to somehow decide which worker).

正如我已经说过的,你所需要的就是拒绝你的自然想法,只为你的目的使用一个工人流程.

哪个工人?好吧,让它成为第一个开始.

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