node解析修改ngix配置文件

主要是通过nginx-conf这个工具。

git地址：https://github.com/tmont/nginx-conf

具体用法：

npm install -S nginx-conf 安装工具

var NginxConfFile = require('nginx-conf').NginxConfFile;

// 这个api提供了node读写conf文件的功能
NginxConfFile.create('/etc/nginx.conf', function(err, conf) {
  if (err) {
    console.log(err);
    return;
  }

// 通过_value的方式读取每一个配置的值
  console.log(conf.nginx.user._value); //www www
  console.log(conf.nginx.http.server.listen._value); //one.example.com

  //模块中有多个子模块，比如server中配置了多个location,通过数组下标的方式访问
  console.log(conf.nginx.http.server.location[3].root._value); // /spool/www

  //修改配置
  //create api是同步修改文件的，对于配置的修改和删除会同步反映到磁盘中

  conf.on('flushed', function() {
    console.log('finished writing to disk');
  });

  //listen to the flushed event to determine when the new file has been flushed to disk
  conf.nginx.events.connections._value = 1000;

  // 这个api的用途是当配置改变时不写到磁盘中
  conf.die('/etc/nginx.conf');
  conf.nginx.events.connections._value = 2000; //change remains local, not in /etc/nginx.conf

  // 将内存中的配置写到另一个文件中
  conf.live('/etc/nginx.conf.bak');

  // 强行将内存中的配置刷到磁盘中
  conf.flush();

  // 增加和移除指令 通过 _add 和 _remove
  conf.nginx.http._add('add_header', 'Cache-Control max-age=315360000, public');
  console.log(conf.nginx.http.add_header._value); //Cache-Control max-age=315360000, public

  conf.nginx.http._add('add_header', 'X-Load-Balancer lb-01');
  conf.nginx.http._add('add_header', 'X-Secure true');
  console.log(conf.nginx.http.add_header[0]._value); //Cache-Control max-age=315360000, public
  console.log(conf.nginx.http.add_header[1]._value); //X-Load-Balancer lb-01
  console.log(conf.nginx.http.add_header[2]._value); //X-Secure true

  conf.nginx.http._remove('add_header'); //removes add_header[0]
  conf.nginx.http._remove('add_header', 1); //removes add_header[1]

  //如果只有一个带有名称的指令，会被被展开成一个属性，通过数组下表访问的将是undefined
  console.log(conf.nginx.http.add_header._value); //X-Load-Balancer lb-01
  console.log(conf.nginx.http.add_header[0]); //undefined

  // 增加一个新的模块
  conf.nginx.http._add('server');
  conf.nginx.http.server._add('listen', '80');

  //that'll create something like this:
  /*
    server {
      listen 80;
    }
  */

  // 存在多个模块是通过数组方式访问
  conf.nginx.http._add('server');
  conf.nginx.http.server[1]._add('listen', '443');

  /*
    server {
      listen 80;
    }
    server {
      listen 443;
    }
  */

  // blocks with values:
  conf.nginx.http.server[1]._add('location', '/');
  conf.nginx.http.server[1].location._add('root', '/var/www/example.com');

  /*
    server {
      location / {
        root /var/www/example.com;
      }
    }
  */

  // lua blocks also work, but you can't put a mismatched "{" or "}" in a comment!
  conf.nginx.http.location._addVerbatimBlock('rewrite_by_lua_block', '{

  ngx.say("this is a lua block!")

  res = ngx.location.capture("/memc",

    { args = { cmd = "incr", key = ngx.var.uri } }

  )

}');
});

此工具同样支持对注释的修改

// 读取use配置上的注释，以数组的方式返回
console.log(conf.nginx.events.use._comments.length); // 1
console.log(conf.nginx.events.use._comments[0]); // use [ kqueue | rtsig | epoll | /dev/poll | select | poll ];

// 删除注释
conf.nginx.events.use._comments.splice(0, 1);

// 添加注释
conf.nginx.event.use._comments.push('my new comment');
console.log(conf.nginx.events.use._comments.length); // 1
console.log(conf.nginx.events.use._comments[0]); //my new comment

// 修改注释
conf.nginx.event.use._comments[0] = 'updated';
console.log(conf.nginx.events.use._comments[0]); //updated

注意特殊情况

foo #comment
bar;

console.log(conf.nginx.foo._value); //bar
console.log(conf.nginx.foo._comments[0]); //comment
But if the comment comes after:

foo bar;
#comment
console.log(conf.nginx.foo._value); //bar
console.log(conf.nginx.foo._comments.length); //0