{"id":34621,"date":"2023-07-04T13:14:49","date_gmt":"2023-05-14T05:18:55","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%b2%97%e7%95%a5%e9%98%85%e8%af%bbdalli%e7%9a%84session_id%e7%94%9f%e6%88%90%e9%83%a8%e5%88%86%e5%8f%aa%e8%af%bb%e5%88%b0%e4%b8%80%e5%8d%8a\/"},"modified":"2024-01-15T08:21:37","modified_gmt":"2024-01-15T00:21:37","slug":"%e7%b2%97%e7%95%a5%e9%98%85%e8%af%bbdalli%e7%9a%84session_id%e7%94%9f%e6%88%90%e9%83%a8%e5%88%86%e5%8f%aa%e8%af%bb%e5%88%b0%e4%b8%80%e5%8d%8a","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%b2%97%e7%95%a5%e9%98%85%e8%af%bbdalli%e7%9a%84session_id%e7%94%9f%e6%88%90%e9%83%a8%e5%88%86%e5%8f%aa%e8%af%bb%e5%88%b0%e4%b8%80%e5%8d%8a\/","title":{"rendered":"\u7c97\u7565\u9605\u8bfb[Dalli\u7684session_id\u751f\u6210\u90e8\u5206][\u53ea\u8bfb\u5230\u4e00\u534a]"},"content":{"rendered":"
def<\/span> get_session<\/span>(<\/span>env<\/span>,<\/span> sid<\/span>)<\/span>\r\n  unless<\/span> sid<\/span> and<\/span> session<\/span> =<\/span> @pool<\/span>.<\/span>get<\/span>(<\/span>sid<\/span>)<\/span>\r\n    sid<\/span>,<\/span> session<\/span> =<\/span> generate_sid<\/span>,<\/span> {}<\/span>\r\n    unless<\/span> @pool<\/span>.<\/span>add<\/span>(<\/span>sid<\/span>,<\/span> session<\/span>)<\/span>\r\n      raise<\/span> \"Session collision on '<\/span>#{<\/span>sid<\/span>.<\/span>inspect<\/span>}<\/span>'\"<\/span>\r\n    end<\/span>\r\n  end<\/span>\r\n  [<\/span>sid<\/span>,<\/span> session<\/span>]<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\u4f3c\u4e4e\u521b\u5efa\u4e86\u4e00\u4e2a\u4f1a\u8bddID\u3002
\n\u9664\u975esid\u548csession = @pool.get(sid)\uff0c\u5426\u5219\u5728\u8fd9\u91cc\u68c0\u67e5sid\u7684\u5b58\u5728\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u8c03\u7528generate_sid\u6765\u521b\u5efasid\u3002<\/p>\n
def<\/span> generate_sid<\/span>\r\n  loop<\/span> do<\/span>\r\n    sid<\/span> =<\/span> super<\/span>\r\n    break<\/span> sid<\/span> unless<\/span> @pool<\/span>.<\/span>get<\/span>(<\/span>sid<\/span>)<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u7528 @pool.get(sid) \u5c06\u4ee5 super \u521b\u5efa\u7684 sid \u5b58\u50a8\u5230 memcached \u4e2d\uff0c\u4ee5 sid \u4f5c\u4e3a\u952e\u3002\u597d\u50cf\u662f\u4e0d\u65ad\u5faa\u73af\u76f4\u5230\u6d88\u9664\u91cd\u590d\u548c\u9519\u8bef…\uff1f<\/p>\n
\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u8fd9\u662f”super”\u3002<\/p>\n
def<\/span> generate_sid<\/span>(<\/span>secure<\/span> =<\/span> @sid_secure<\/span>)<\/span>\r\n  if<\/span> secure<\/span>\r\n    SecureRandom<\/span>.<\/span>hex<\/span>(<\/span>@sid_length<\/span>)<\/span>\r\n  else<\/span>\r\n    \"%0<\/span>#{<\/span>@sid_length<\/span>}<\/span>x\"<\/span> %<\/span> Kernel<\/span>.<\/span>rand<\/span>(<\/span>2<\/span>**<\/span>@sidbits<\/span> -<\/span> 1<\/span>)<\/span>\r\n  end<\/span>\r\nrescue<\/span> NotImplementedError<\/span>\r\n  generate_sid<\/span>(<\/span>false<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
def<\/span> get<\/span>(<\/span>key<\/span>,<\/span> options<\/span>=<\/span>nil<\/span>)<\/span>\r\n  resp<\/span> =<\/span> perform<\/span>(<\/span>:get<\/span>,<\/span> key<\/span>)<\/span>\r\n  (<\/span>!<\/span>resp<\/span> ||<\/span> resp<\/span> ==<\/span> 'Not found'<\/span>)<\/span> ?<\/span> nil<\/span> :<\/span> resp<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5728perform(:get, key)\u4e2d\uff0c\u6211\u4eec\u5bf9key\u8fdb\u884c\u683c\u5f0f\u68c0\u67e5\u5e76\u5c06\u5176\u6dfb\u52a0\u5230memcached\u4e2d\u3002<\/p>\n
def<\/span> perform<\/span>(<\/span>op<\/span>,<\/span> key<\/span>,<\/span> *<\/span>args<\/span>)<\/span>\r\n  key<\/span> =<\/span> key<\/span>.<\/span>to_s<\/span>\r\n  validate_key<\/span>(<\/span>key<\/span>)<\/span>\r\n  key<\/span> =<\/span> key_with_namespace<\/span>(<\/span>key<\/span>)<\/span>\r\n  begin<\/span>\r\n    server<\/span> =<\/span> ring<\/span>.<\/span>server_for_key<\/span>(<\/span>key<\/span>)<\/span>\r\n    server<\/span>.<\/span>request<\/span>(<\/span>op<\/span>,<\/span> key<\/span>,<\/span> *<\/span>args<\/span>)<\/span>\r\n  rescue<\/span> NetworkError<\/span> =><\/span> e<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>debug<\/span> {<\/span> e<\/span>.<\/span>message<\/span> }<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>debug<\/span> {<\/span> \"retrying request with new server\"<\/span> }<\/span>\r\n    retry<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8fdb\u4e00\u6b65\u9605\u8bfbring.server_for_key\u8bd5\u8bd5\u770b\u3002<\/h2>\n
ring.server_for_key(key)\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/p>\n
def<\/span> ring<\/span>\r\n    @ring<\/span> ||=<\/span> Dalli<\/span>::<\/span>Ring<\/span>.<\/span>new<\/span>(<\/span>\r\n        Array<\/span>(<\/span>@servers<\/span>).<\/span>map<\/span> do<\/span> |<\/span>s<\/span>|<\/span>\r\n        Dalli<\/span>::<\/span>Server<\/span>.<\/span>new<\/span>(<\/span>s<\/span>,<\/span> @options<\/span>)<\/span>\r\n    end<\/span>,<\/span> @options<\/span>\r\n    )<\/span>\r\nend<\/span> \r\n<\/code><\/pre>\n
\u65e2\u7136\u63d0\u5230\u4e86Dalli :: Ring.new\uff0c\u9996\u5148\u8ba9\u6211\u4eec\u5173\u6ce8\u4e00\u4e0bArray\uff08@servers\uff09.map\u3002
\n@servers\u662f\u5728initialize\u4e2d\u521b\u5efa\u7684\u3002<\/p>\n
def<\/span> initialize<\/span>(<\/span>servers<\/span>=<\/span>nil<\/span>,<\/span> options<\/span>=<\/span>{})<\/span> \r\n  @servers<\/span> =<\/span> env_servers<\/span> ||<\/span> servers<\/span> ||<\/span> '127.0.0.1:11211'<\/span> \r\n  @options<\/span> =<\/span> {<\/span> :expires_in<\/span> =><\/span> 0<\/span> }.<\/span>merge<\/span>(<\/span>options<\/span>)<\/span> \r\n  self<\/span>.<\/span>extend<\/span>(<\/span>Dalli<\/span>::<\/span>Client<\/span>::<\/span>MemcacheClientCompatibility<\/span>)<\/span> if<\/span> Dalli<\/span>::<\/span>Client<\/span>.<\/span>compatibility_mode<\/span> \r\n  @ring<\/span> =<\/span> nil<\/span> \r\nend<\/span> \r\n<\/code><\/pre>\n
\u6211\u5927\u81f4\u53ef\u4ee5\u60f3\u8c61\uff0c\u4f46\u8fd8\u662f\u5148\u770b\u770benv_servers\u3002<\/p>\n
def<\/span> env_servers<\/span>\r\n  ENV<\/span>[<\/span>'MEMCACHE_SERVERS'<\/span>]<\/span> ?<\/span> ENV<\/span>[<\/span>'MEMCACHE_SERVERS'<\/span>].<\/span>split<\/span>(<\/span>','<\/span>)<\/span> :<\/span> nil<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u770b\u8d77\u6765\u662f\u5728\u67e5\u770b\u914d\u7f6e\u6587\u4ef6\u3002\u5982\u679c\u6ca1\u6709\u7684\u8bdd\uff0c\u5c31\u4f7f\u7528\u901a\u8fc7\u53c2\u6570\u4f20\u9012\u7684\u670d\u52a1\u5668\uff0c\u5982\u679c\u8fde\u90a3\u4e2a\u4e5f\u6ca1\u6709\uff0c\u5219\u4f7f\u7528\u9ed8\u8ba4\u7684’127.0.0.1:11211’\uff0c\u8fd9\u662fDalli::Ring.new\u7684\u64cd\u4f5c\u3002<\/p>\n
def<\/span> initialize<\/span>(<\/span>servers<\/span>,<\/span> options<\/span>)<\/span>\r\n  @servers<\/span> =<\/span> servers<\/span>\r\n  @continuum<\/span> =<\/span> nil<\/span>\r\n  if<\/span> servers<\/span>.<\/span>size<\/span> ><\/span> 1<\/span>\r\n    total_weight<\/span> =<\/span> servers<\/span>.<\/span>inject<\/span>(<\/span>0<\/span>)<\/span> {<\/span> |<\/span>memo<\/span>,<\/span> srv<\/span>|<\/span> memo<\/span> +<\/span> srv<\/span>.<\/span>weight<\/span> }<\/span>\r\n    continuum<\/span> =<\/span> []<\/span>\r\n    servers<\/span>.<\/span>each<\/span> do<\/span> |<\/span>server<\/span>|<\/span>\r\n      entry_count_for<\/span>(<\/span>server<\/span>,<\/span> servers<\/span>.<\/span>size<\/span>,<\/span> total_weight<\/span>).<\/span>times<\/span> do<\/span> |<\/span>idx<\/span>|<\/span>\r\n        hash<\/span> =<\/span> Digest<\/span>::<\/span>SHA1<\/span>.<\/span>hexdigest<\/span>(<\/span>\"<\/span>#{<\/span>server<\/span>.<\/span>hostname<\/span>}<\/span>:<\/span>#{<\/span>server<\/span>.<\/span>port<\/span>}<\/span>:<\/span>#{<\/span>idx<\/span>}<\/span>\"<\/span>)<\/span>\r\n        value<\/span> =<\/span> Integer<\/span>(<\/span>\"0x<\/span>#{<\/span>hash<\/span>[<\/span>0<\/span>..<\/span>7<\/span>]<\/span>}<\/span>\"<\/span>)<\/span>\r\n        continuum<\/span> <<<\/span> Dalli<\/span>::<\/span>Ring<\/span>::<\/span>Entry<\/span>.<\/span>new<\/span>(<\/span>value<\/span>,<\/span> server<\/span>)<\/span>\r\n      end<\/span>\r\n    end<\/span>\r\n    @continuum<\/span> =<\/span> continuum<\/span>.<\/span>sort<\/span> {<\/span> |<\/span>a<\/span>,<\/span> b<\/span>|<\/span> a<\/span>.<\/span>value<\/span> <=><\/span> b<\/span>.<\/span>value<\/span> }<\/span>\r\n  end<\/span>\r\n\r\n  threadsafe!<\/span> unless<\/span> options<\/span>[<\/span>:threadsafe<\/span>]<\/span> ==<\/span> false<\/span>\r\n  @failover<\/span> =<\/span> options<\/span>[<\/span>:failover<\/span>]<\/span> !=<\/span> false<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u6b63\u76f4\u8bfb\u8d77\u6765\u5f88\u56f0\u96be\uff0c\u6240\u4ee5\u4e0b\u4e00\u4e2a\u3002<\/p>\n
def<\/span> server_for_key<\/span>(<\/span>key<\/span>)<\/span>\r\n  if<\/span> @continuum<\/span>\r\n    hkey<\/span> =<\/span> hash_for<\/span>(<\/span>key<\/span>)<\/span>\r\n    20<\/span>.<\/span>times<\/span> do<\/span> |<\/span>try<\/span>|<\/span>\r\n      entryidx<\/span> =<\/span> self<\/span>.<\/span>class<\/span>.<\/span>binary_search<\/span>(<\/span>@continuum<\/span>,<\/span> hkey<\/span>)<\/span>\r\n      server<\/span> =<\/span> @continuum<\/span>[<\/span>entryidx<\/span>].<\/span>server<\/span>\r\n      return<\/span> server<\/span> if<\/span> server<\/span>.<\/span>alive?<\/span>\r\n      break<\/span> unless<\/span> @failover<\/span>\r\n      hkey<\/span> =<\/span> hash_for<\/span>(<\/span>\"<\/span>#{<\/span>try<\/span>}#{<\/span>key<\/span>}<\/span>\"<\/span>)<\/span>\r\n    end<\/span>\r\n  else<\/span>\r\n    server<\/span> =<\/span> @servers<\/span>.<\/span>first<\/span>\r\n    return<\/span> server<\/span> if<\/span> server<\/span> &&<\/span> server<\/span>.<\/span>alive?<\/span>\r\n  end<\/span>\r\n\r\n  raise<\/span> Dalli<\/span>::<\/span>RingError<\/span>,<\/span> \"No server available\"<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u670d\u52a1\u5668\u5b58\u6d3b\uff0c\u5c31\u8fd4\u56deserver\u3002\u8fd9\u4e2a\u4ee3\u7801\u662f\u901a\u8fc7\u5224\u65adserver\u662f\u5426\u5b58\u5728\u4e14\u5b58\u6d3b\u6765\u8fd4\u56de\u503c\u7684\u3002\u7136\u800c\uff0c\u5b9e\u9645\u4e0aserver\u662fDalli::Server\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u67e5\u770bDalli::Server#request\u65b9\u6cd5\u3002<\/p>\n
def<\/span> request<\/span>(<\/span>op<\/span>,<\/span> *<\/span>args<\/span>)<\/span>\r\n  raise<\/span> Dalli<\/span>::<\/span>NetworkError<\/span>,<\/span> \"<\/span>#{<\/span>hostname<\/span>}<\/span>:<\/span>#{<\/span>port<\/span>}<\/span> is down: <\/span>#{<\/span>@error<\/span>}<\/span> #{<\/span>@msg<\/span>}<\/span>\"<\/span> unless<\/span> alive?<\/span>\r\n  begin<\/span>\r\n    send<\/span>(<\/span>op<\/span>,<\/span> *<\/span>args<\/span>)<\/span>\r\n  rescue<\/span> Dalli<\/span>::<\/span>NetworkError<\/span>\r\n    raise<\/span>\r\n  rescue<\/span> Dalli<\/span>::<\/span>MarshalError<\/span> =><\/span> ex<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>error<\/span> \"Marshalling error for key '<\/span>#{<\/span>args<\/span>.<\/span>first<\/span>}<\/span>': <\/span>#{<\/span>ex<\/span>.<\/span>message<\/span>}<\/span>\"<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>error<\/span> \"You are trying to cache a Ruby object which cannot be serialized to memcached.\"<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>error<\/span> ex<\/span>.<\/span>backtrace<\/span>.<\/span>join<\/span>(<\/span>\"<\/span>\\n\\t<\/span>\"<\/span>)<\/span>\r\n    false<\/span>\r\n  rescue<\/span> Dalli<\/span>::<\/span>DalliError<\/span>\r\n    raise<\/span>\r\n  rescue<\/span> =><\/span> ex<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>error<\/span> \"Unexpected exception in Dalli: <\/span>#{<\/span>ex<\/span>.<\/span>class<\/span>.<\/span>name<\/span>}<\/span>: <\/span>#{<\/span>ex<\/span>.<\/span>message<\/span>}<\/span>\"<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>error<\/span> \"This is a bug in Dalli, please enter an issue in Github if it does not already exist.\"<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>error<\/span> ex<\/span>.<\/span>backtrace<\/span>.<\/span>join<\/span>(<\/span>\"<\/span>\\n\\t<\/span>\"<\/span>)<\/span>\r\n    down!<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u867d\u7136\u6211\u4e00\u76f4\u5728\u8fdb\u884c\u6551\u63f4\uff0c\u4f46\u6211\u4e0d\u5728\u610f\u3002\u603b\u4e4b\u5c31\u662f\u8c03\u7528\u4e86 send(op, *args)\u3002\u56e0\u4e3a\u8c03\u7528\u4e86 Object#send\uff0c\u6240\u4ee5\u5728\u8c08\u8bba op \u662f\u4ec0\u4e48\u3002\u901a\u8fc7 ring.server_for_key \u8fd4\u56de\u7684 server\uff0c\u8c03\u7528\u4e86 server.request(op, key, *args)\uff0c\u6240\u4ee5\u53ea\u9700\u67e5\u770b perform(op, key, *args) \u4e2d\u7684 op \u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
\u6362\u8a00\u4e4b<\/p>\n
def<\/span> generate_sid<\/span>\r\n  loop<\/span> do<\/span>\r\n    sid<\/span> =<\/span> super<\/span>\r\n    break<\/span> sid<\/span> unless<\/span> @pool<\/span>.<\/span>get<\/span>(<\/span>sid<\/span>)<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u4ec5\u9700\u8981\u4e00\u79cd\u9009\u62e9\uff0c\u4ee5\u4e0b\u662f\u5bf9\u8be5\u53e5\u5b50\u7684\u6c49\u8bed\u672c\u5730\u5316\u91ca\u4e49\uff1a
\n\u8c03\u7528\u4e86 @pool.get(sid) \u7684\u90e8\u5206\u3002<\/p>\n
def<\/span> get<\/span>(<\/span>key<\/span>,<\/span> options<\/span>=<\/span>nil<\/span>)<\/span>\r\n  resp<\/span> =<\/span> perform<\/span>(<\/span>:get<\/span>,<\/span> key<\/span>)<\/span>\r\n  (<\/span>!<\/span>resp<\/span> ||<\/span> resp<\/span> ==<\/span> 'Not found'<\/span>)<\/span> ?<\/span> nil<\/span> :<\/span> resp<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u6240\u4ee5op\u7684\u771f\u6b63\u8eab\u4efd\u662f\uff1aget\u3002
\n\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u9700\u8981\u770bDalli::Server#get\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
def<\/span> get<\/span>(<\/span>key<\/span>)<\/span>\r\n  req<\/span> =<\/span> [<\/span>REQUEST<\/span>,<\/span> OPCODES<\/span>[<\/span>:get<\/span>],<\/span> key<\/span>.<\/span>bytesize<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> key<\/span>.<\/span>bytesize<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> key<\/span>].<\/span>pack<\/span>(<\/span>FORMAT<\/span>[<\/span>:get<\/span>])<\/span>\r\n  write<\/span>(<\/span>req<\/span>)<\/span>\r\n  generic_response<\/span>(<\/span>true<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u6211\u5728\u5199\u3002<\/p>\n
def<\/span> write<\/span>(<\/span>bytes<\/span>)<\/span>\r\n  begin<\/span>\r\n    @sock<\/span>.<\/span>write<\/span>(<\/span>bytes<\/span>)<\/span>\r\n  rescue<\/span> SystemCallError<\/span>,<\/span> Timeout<\/span>::<\/span>Error<\/span>\r\n    failure!<\/span>\r\n    retry<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5f53@sock\u88ab\u8c03\u7528ring.server_for_key\u65f6\uff0c\u4f1a\u8c03\u7528server.alive\uff1f\u5e76\u5728\u5176\u4e2d\u751f\u6210\u3002<\/p>\n
def<\/span> alive?<\/span>\r\n  return<\/span> true<\/span> if<\/span> @sock<\/span>\r\n\r\n  if<\/span> @last_down_at<\/span> &&<\/span> @last_down_at<\/span> +<\/span> options<\/span>[<\/span>:down_retry_delay<\/span>]<\/span> >=<\/span> Time<\/span>.<\/span>now<\/span>\r\n    time<\/span> =<\/span> @last_down_at<\/span> +<\/span> options<\/span>[<\/span>:down_retry_delay<\/span>]<\/span> -<\/span> Time<\/span>.<\/span>now<\/span>\r\n    Dalli<\/span>.<\/span>logger<\/span>.<\/span>debug<\/span> {<\/span> \"down_retry_delay not reached for <\/span>#{<\/span>hostname<\/span>}<\/span>:<\/span>#{<\/span>port<\/span>}<\/span> (%.3f seconds left)\"<\/span> %<\/span> time<\/span> }<\/span>\r\n    return<\/span> false<\/span>\r\n  end<\/span>\r\n\r\n  connect<\/span>\r\n  !!<\/span>@sock<\/span>\r\nrescue<\/span> Dalli<\/span>::<\/span>NetworkError<\/span>\r\n  false<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u4e2d\u6307\u7684\u662f\u8fde\u63a5+\u7684\u4e8b\u52a1\u3002<\/p>\n
def<\/span> connect<\/span>\r\n  Dalli<\/span>.<\/span>logger<\/span>.<\/span>debug<\/span> {<\/span> \"Dalli::Server#connect <\/span>#{<\/span>hostname<\/span>}<\/span>:<\/span>#{<\/span>port<\/span>}<\/span>\"<\/span> }<\/span>\r\n\r\n  begin<\/span>\r\n    if<\/span> @hostname<\/span> =~<\/span> \/^\\\/\/<\/span>\r\n      @sock<\/span> =<\/span> USocket<\/span>.<\/span>new<\/span>(<\/span>hostname<\/span>)<\/span>\r\n    elsif<\/span> options<\/span>[<\/span>:async<\/span>]<\/span>\r\n      raise<\/span> Dalli<\/span>::<\/span>DalliError<\/span>,<\/span> \"EM support not enabled, as em-synchrony is not installed.\"<\/span> if<\/span> not<\/span> defined?<\/span>(<\/span>AsyncSocket<\/span>)<\/span>\r\n      @sock<\/span> =<\/span> AsyncSocket<\/span>.<\/span>open<\/span>(<\/span>hostname<\/span>,<\/span> port<\/span>,<\/span> :timeout<\/span> =><\/span> options<\/span>[<\/span>:socket_timeout<\/span>])<\/span>\r\n    else<\/span>\r\n      @sock<\/span> =<\/span> KSocket<\/span>.<\/span>open<\/span>(<\/span>hostname<\/span>,<\/span> port<\/span>,<\/span> :timeout<\/span> =><\/span> options<\/span>[<\/span>:socket_timeout<\/span>])<\/span>\r\n    end<\/span>\r\n    @version<\/span> =<\/span> version<\/span> # trigger actual connect<\/span>\r\n    sasl_authentication<\/span> if<\/span> need_auth?<\/span>\r\n    up!<\/span>\r\n  rescue<\/span> Dalli<\/span>::<\/span>DalliError<\/span> # SASL auth failure<\/span>\r\n    raise<\/span>\r\n  rescue<\/span> SystemCallError<\/span>,<\/span> Timeout<\/span>::<\/span>Error<\/span>,<\/span> EOFError<\/span>,<\/span> SocketError<\/span>\r\n    # SocketError = DNS resolution failure<\/span>\r\n    failure!<\/span>\r\n    retry<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
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