和大規模運營相關的技術點。我想到的有下面四個

1）vhost

2) edge 

3) forword

4) log trace 

5）reload

6）http-api

7)  statis

下面來一個一個具體分析

vhost ,意思就是virtual host .虛擬主機的意思。可以在一臺機器上支援不同的域名，用來分割使用者或者是不同的功能。關於vhost的詳細作用。在作者的這篇文章中有詳細的說明

https://github.com/ossrs/srs/wiki/v1_CN_RtmpUrlVhost

下面我分析下程式碼中的實現。

vhost會隨著connect 的命令連線上來。connect命令中有幾個引數如下

抓個包看看具體都代表什麼

app --應用名稱

swfurl==tcurl，

那麼在伺服器上是怎麼處理的呢？

在處理連線的函式裡是這樣的

int SrsRtmpConn::do_cycle()

if ((ret = rtmp->connect_app(req)) != ERROR_SUCCESS) {
        srs_error("rtmp connect vhost/app failed. ret=%d", ret);
        return ret;
    }

 // discovery vhost, resolve the vhost from config
    SrsConfDirective* parsed_vhost = _srs_config->get_vhost(req->vhost);
    if (parsed_vhost) {
        req->vhost = parsed_vhost->arg0();
    }
 

srs_info("discovery app success. schema=%s, vhost=%s, port=%s, app=%s",
        req->schema.c_str(), req->vhost.c_str(), req->port.c_str(), req->app.c_str());
    
    if (req->schema.empty() || req->vhost.empty() || req->port.empty() || req->app.empty()) {
        ret = ERROR_RTMP_REQ_TCURL;
        srs_error("discovery tcUrl failed. "
            "tcUrl=%s, schema=%s, vhost=%s, port=%s, app=%s, ret=%d",
            req->tcUrl.c_str(), req->schema.c_str(), req->vhost.c_str(), req->port.c_str(), req->app.c_str(), ret);
        return ret;
    }
 

 // check vhost
    if ((ret = check_vhost()) != ERROR_SUCCESS) {
        srs_error("check vhost failed. ret=%d", ret);
        return ret;
    }

int SrsRtmpConn::check_vhost()
{
    int ret = ERROR_SUCCESS;
    
    srs_assert(req != NULL);
    
    SrsConfDirective* vhost = _srs_config->get_vhost(req->vhost);
    if (vhost == NULL) {
        ret = ERROR_RTMP_VHOST_NOT_FOUND;
        srs_error("vhost %s not found. ret=%d", req->vhost.c_str(), ret);
        return ret;
    }
    
    if (!_srs_config->get_vhost_enabled(req->vhost)) {
        ret = ERROR_RTMP_VHOST_NOT_FOUND;
        srs_error("vhost %s disabled. ret=%d", req->vhost.c_str(), ret);
        return ret;
    }
    
    if (req->vhost != vhost->arg0()) {
        srs_trace("vhost change from %s to %s", req->vhost.c_str(), vhost->arg0().c_str());
        req->vhost = vhost->arg0();
    }
    
    if ((ret = refer->check(req->pageUrl, _srs_config->get_refer(req->vhost))) != ERROR_SUCCESS) {
        srs_error("check refer failed. ret=%d", ret);
        return ret;
    }
    srs_verbose("check refer success.");
    
    if ((ret = http_hooks_on_connect()) != ERROR_SUCCESS) {
        return ret;
    }
    
    return ret;
}

3) edge 叢集。

單獨用一篇文章來分析。比較複雜