Varnish VCL 4 - With Cookies Languages

default.vcl

vcl 4.0;
import std;
import directors;
# probe health {
#   # Url de consulta, padrao eh "/"
#   # .url = "/";
#   # Especifica uma requisicao completa de  HTTP usando multiplas strings
#   .request =
#     "HEAD / HTTP/1.1"
#     "Host: homolog.opac.scielo.org"
#     "Connection: close"
#     "User-Agent: Varnish Health Probe";
#   # Codigo HTTP esperado. padrao eh 200.
#   .expected_response = 200;
#   # Tempo de TimeOut para o Probe
#   .timeout = 3s;
#   # Frequencia que o probe faz a checagem
#   .interval = 30s;
#   # Quantas pesquisas para testar a saude do backend
#   .window =5;
#   # Se 3 tiverem sucesso eu considero o backend saudevel
#   .threshold = 3;
# }

backend lb01opac {
  # .host = "192.168.1.60";
  # .port = "56888";
  # .probe = health;
  .host = "192.168.169.100";
  .port = "5001";
  # .probe = health;
}

backend lb02opac {
  # .host = "192.168.1.61";
  # .port = "56888";
  # .probe = health;
  .host = "192.168.169.100";
  .port = "5001";
  # .probe = health;
}

sub vcl_init {
  new round_robin_director = directors.round_robin();
  round_robin_director.add_backend(lb01opac);
  round_robin_director.add_backend(lb02opac);
}

sub identify_user_lang {
  if (req.http.cookie ~ "language=") {
    #unset all the cookie from request except language
    set req.http.X-Language = regsub(req.http.cookie, "(.*?)(language=)([^;]*)(.*)$", "\3");
  }
}

sub vcl_recv {
  # Regra de X-Forwarded-For
  if (req.http.x-forwarded-for) {
    set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip;
  } else {
    set req.http.X-Forwarded-For = client.ip;
  }

  # Regra geral para fazer cache de requisicoes GET e HEAD
  if (req.method != "GET" &&
      req.method != "HEAD" &&
      req.method != "PUT" &&
      req.method != "POST" &&
      req.method != "TRACE" &&
      req.method != "OPTIONS" &&
      req.method != "DELETE") {
      # Non-RFC2616 or CONNECT which is weird.
    return (pipe);
  }

  # Only cache GET or HEAD requests. This makes sure the POST requests are always passed.
  if (req.method != "GET" && req.method != "HEAD") {
    return (pass);
  }

  if (req.url ~ "^/admin") {
    return (pass);
  }

  call identify_user_lang;
  # if(!req.http.cookie ~ "language"){
  #   #unset all the cookie from request except language
  #   unset req.http.Cookie;
  # }
  unset req.http.Cookie;

  return (hash);
}

# The data on which the hashing will take place
sub vcl_hash {
  # Called after vcl_recv to create a hash value for the request. This is used as a key to look up the object in Varnish.

  hash_data(req.url);

  if (req.http.host) {
    hash_data(req.http.host);
  } else {
    hash_data(server.ip);
  }

  if (req.http.X-Language) {
      # add cookie in hash
      hash_data(req.http.X-Language);
  }

  return (lookup);
}

sub vcl_backend_response {
  if (bereq.url ~ "^/admin") {
    return (deliver);
  }

  # if (bereq.url ~ "^/set_locale"){
  #   set beresp.http.X-Language = regsub(bereq.url, "^/set_locale/(.*?)/", "\1");
  #   set beresp.ttl = 2s;
  #   set beresp.uncacheable = true;
  #   return (deliver);
  # }

  if (!beresp.http.Set-Cookie ~ "language") {
    unset beresp.http.Set-cookie;
  }

  if (bereq.url ~ "^/set_locale" && beresp.status == 302) {
    set beresp.http.Vary = "Cookie";
  }

  unset beresp.http.expires;
  set beresp.http.cache-control = "max-age=900";
  set beresp.ttl = 168h;
  unset beresp.http.Server;
  set beresp.http.Server = "nginx";

  return (deliver);
}

sub vcl_deliver {
  if (obj.hits > 0) {
    set resp.http.X-Cache = "HIT";
  } else {
    set resp.http.X-Cache = "MISS";
  }

  return (deliver);
}