ngx_http_v3_init_session function

[Clima Gabriel]

Hello everyone,

(the code is probably clearer and attached below)
This function modifies what ngx_connection_t->data points to.
ngx_connection_t->data is initially *ngx_http_connection_t.
The *ngx_http_connection_t is assigned to
ngx_http_v3_session_t->http_connection
And the *ngx_http_v3_session_t assigned to ngx_connection_t->data.

Result: before ngx_connection_t->data is *ngx_http_connection_t
               after ngx_connection_t->data is *ngx_http_v3_session_t

My question is: what is the proper way to find out what c->data is at any
given time? I need to know this because I'm writing a function which uses
the ngx_http_connection_t to obtain the hostname of the request, and it may
be invoked before or after the ngx_http_v3_init_session.

ngx_int_t
ngx_http_v3_init_session(ngx_connection_t *c)
{
    ngx_pool_cleanup_t     *cln;
    ngx_http_connection_t  *hc;
    ngx_http_v3_session_t  *h3c;

    hc = c->data;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 init session");

    h3c = ngx_pcalloc(c->pool, sizeof(ngx_http_v3_session_t));
    if (h3c == NULL) {
        goto failed;
    }

    h3c->http_connection = hc;

    ngx_queue_init(&h3c->blocked);

    h3c->keepalive.log = c->log;
    h3c->keepalive.data = c;
    h3c->keepalive.handler = ngx_http_v3_keepalive_handler;

    h3c->table.send_insert_count.log = c->log;
    h3c->table.send_insert_count.data = c;
    h3c->table.send_insert_count.handler =
ngx_http_v3_inc_insert_count_handler;

    cln = ngx_pool_cleanup_add(c->pool, 0);
    if (cln == NULL) {
        goto failed;
    }

    cln->handler = ngx_http_v3_cleanup_session;
    cln->data = h3c;

    c->data = h3c;

    return NGX_OK;

failed:

    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to create http3 session");
    return NGX_ERROR;
}

Regards,
Gabriel
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