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README.md

grails-cows-cache-plugin

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The plugin provides possibility to store pages of page fragments in memcached and use it directly from web servers

thx. to ehcache web for web filter code

Grails 3.2, 3.3 supported

Usage

Base logic:

  • on first page access, nginx request memcached and receives empty result.
  • as a fallback, nginx request web application.
  • if action marked as memcached, page will be rendered and added to memcached
  • response from web application will be returned to user
  • on next requests, content from memcached will be used without calling web application
  • dynamic parts of page can be requested by SSI doc on server side or by ajax from client

Plugin can be disabled by memcached.disabled=true setting

Controllers actions can be marked by @Memcached(value = 7200, packed = true) annotation or by MemcachedHelper.mark(request, 7200)

cached content can be removed by memcachedService.remove(url) or memcachedService.flush()

SSI for dynamic content supported , see doc

<!--# include virtual="${createLink(controller: 'controller', action: 'action', id:id)}" wait='yes'-->

or

<mc:memcachedTile url="${createLink(controller:'controller',action:'action', id:id))}">
   <span>Content for non-cached page</span>
</mc:memcachedTile>

<mc:memcachedLog/> shows caching time if memcached activated fror the page

Installation

Add the following dependencies in build.gradle

repositories {
...
  maven { url "http://dl.bintray.com/purpleraven/plugins" }
...
}
dependencies {
...
    compile 'org.grails.plugins:grails-memcached-web-plugin:1.2'
...
}

In web application config, example for Nginx


  upstream app.port {
    server localhost:8080; # tomcat port
  }
  
  upstream memcached.port {
    server localhost:11211; # memcached port
  }
  
  # without compression, bug ssi supported
  location / {
      ssi on; 
      set $memcached_key "$uri?$args";
      memcached_pass memcached.port;
      memcached_gzip_flag 2;
      default_type text/html;
      charset utf-8;
      gunzip on;
      proxy_set_header Accept-Encoding "gzip";
      error_page  404 405 400 500 502 503 504 = @fallback;
    }
  
  location @fallback {
      ssi on;
      proxy_pass http://app.port;
      proxy_max_temp_file_size 0;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_http_version 1.1;
      proxy_set_header Connection "";
      error_page 400 500 502 503 504  /offline.html;
    }
  
  # without compression, ssi NOT supported
  location /compressed/example {
    set $memcached_key "$uri?$args";
    memcached_pass memcached.port;
    memcached_gzip_flag 2;
    default_type text/html;
    charset utf-8;
    gunzip on;
    proxy_set_header Accept-Encoding "gzip";
    error_page  404 405 400 500 502 503 504 = @compressed_fallback;
  }

  location @compressed_fallback {
    proxy_pass http://app.port;
    proxy_max_temp_file_size 0;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
    error_page 400 500 502 503 504  /offline.html;
  }


License

Apache 2

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