ParaviewWeb学习记录3

上述的对Apache虚拟主机的配置过程,主要在于三个部分:Apache,launcher,pvw,主要的配置在前面,通过Apache来分发用户,通过launcher来为用户启动pvw的进程。

我的理解:给Apache配置虚拟主机是为了把Apache当做一个虚拟的主机供用户访问,用户直接访问的是Apache,但实际上是通过Apache来访问pvw,该虚拟主机访问链接是:http://localhost:port;launcher.conf中配置了真正要访问的主机的sessionURL,虚拟主机中设定一种重写规则,通过这个规则去匹配launcher.conf,当用户访问的时候,虚拟主机为用户设定一个id用于区分不用用户,并且记录在proxy.txt中,然后去launcher.conf中匹配,从设定好的端口范围中选取一个,以这个ws://${host}/proxy?sessionId=${id}组合成的sessionURL去访问pvw,从而为该用户启动一个后台的程序;Apache分发的不同用户通过proxy.txt与launcher进行匹配,从而保证了不同用户请求与响应的分离。

官网上有两种方式来配置,一种是Apache与launcher在一台主机上,另外一种是这两部分放在不同的主机上,通过配置文件的比较,发现配置文件区别不是很大,只是在于launcher.conf中对host的设置,另外有一个jetty launcher,没用到,所以没仔细看。配置文件粘贴如下,官网网址点击打开链接。

在一台主机上Apache虚拟主机:

 *:80>
    ServerName   host1.example.com
    ...
    # Handle launcher forwarding
    ProxyPass /paraview http://localhost:8080/paraview

    # Handle WebSocket forwarding
    RewriteEngine On
    RewriteMap  session-to-port  txt:/proxy.txt
    RewriteCond %{QUERY_STRING}  ^sessionId=(.*)$               [NC]
    RewriteRule ^/proxy.*$       ws://${session-to-port:%1}/ws  [P]
在一台主机上launcher.conf:

{
    "resources": [ {"host": "localhost", "port_range": [9001, 9003] } ],
    ...
    "configuration": {
      "host": "localhost",
      "port": 8080,
      "sessionURL": "ws://host1.example.com/proxy?sessionId=${id}",
      "proxy_file": "/proxy.txt"
    },
    ...
    "apps": {
      ...,
      "visualizer": {
        "cmd": [
          "${python_exec}", "${python_path}/paraview/web/pv_web_visualizer.py",
          "--port", "${port}", "--data-dir", "${dataDir}", "-f", "--authKey", "${secret}"
        ],
        "ready_line" : "Starting factory"
      },
      ...
    }
}
在两台主机上Apache虚拟主机:

 *:80>
    ServerName   host1.example.com
    ...
    # Handle launcher forwarding
    ProxyPass /paraview http://host2.example.com:8080/paraview

    # Handle WebSocket forwarding
    RewriteEngine On
    RewriteMap  session-to-port  txt:/proxy.txt
    RewriteCond %{QUERY_STRING}  ^sessionId=(.*)$               [NC]
    RewriteRule ^/proxy.*$       ws://${session-to-port:%1}/ws  [P]
在两台主机上launcher.conf:

{
    "resources": [ {"host": "host2.example.com", "port_range": [9001, 9003] } ],
    ...
    "configuration": {
      "host": "localhost",
      "port": 8080,
      "sessionURL": "ws://${host}/proxy?sessionId=${id}",
      "proxy_file": "/proxy.txt"
    },
    ...
    "apps": {
      ...,
      "visualizer": {
        "cmd": [
          "${python_exec}", "${python_path}/paraview/web/pv_web_visualizer.py",
          "--port", "${port}", "--data-dir", "${dataDir}", "-f", "--authKey", "${secret}"
        ],
        "ready_line" : "Starting factory"
      },
      ...
    }
}



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