How to get memcached all keys

hgjgh

　　1、通过发送"stats items STAT items:0:number 0 \r\n"获取所有的slab，并从中解析出slabId。返回结果参考如下：



STAT items:1:number 7
STAT items:1:age 966591
STAT items:1:evicted 0
STAT items:1:outofmemory 0
STAT items:2:number 32
STAT items:2:age 1206400
STAT items:2:evicted 0
STAT items:2:outofmemory 0

　　2、上面的数字1、2就是所谓的slabId，通过发送"stats cachedump [slabId] 200000 ITEM views.decorators.cache.cache_header..cc7d9 [6 b; 1256056128 s] \r\n"获取每个slab存储的所有键项。返回结果参考如下：



ITEM razor_html[depend][webim][all][union_standard] [10 b; 1365091199 s]
　　示例代码：



/// <summary>
/// 程序
/// </summary>
class Program
{
/// <summary>
/// 主入口
/// </summary>
/// <param name="args">参数</param>
static void Main(String[] args)
{
var ipString = "127.0.0.1";
var port = 11211;
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Connect(new IPEndPoint(IPAddress.Parse(ipString), port));
var slabIdIter = QuerySlabId(socket);
var keyIter = QueryKeys(socket, slabIdIter);
socket.Close();
foreach (String key in keyIter)
Console.Write(key + " ");
Console.Read();
}
/// <summary>
/// 执行返回字符串标量
/// </summary>
/// <param name="socket">套接字</param>
/// <param name="command">命令</param>
/// <returns>执行结果</returns>
static String ExecuteScalarAsString(Socket socket, String command)
{
var sendNumOfBytes = socket.Send(Encoding.UTF8.GetBytes(command));
var bufferSize = 0x1000;
var buffer = new Byte[bufferSize];
var readNumOfBytes = 0;
var sb = new StringBuilder();
while (true)
{
readNumOfBytes = socket.Receive(buffer);
sb.Append(Encoding.UTF8.GetString(buffer));
if (readNumOfBytes < bufferSize)
break;
}
return sb.ToString();
}
/// <summary>
/// 查询slabId
/// </summary>
/// <param name="socket">套接字</param>
/// <returns>slabId遍历器</returns>
static IEnumerable<String> QuerySlabId(Socket socket)
{
var command = "stats items STAT items:0:number 0 \r\n";
var contentAsString = ExecuteScalarAsString(socket, command);
return ParseStatsItems(contentAsString);
}
/// <summary>
/// 解析STAT items返回slabId
/// </summary>
/// <param name="contentAsString">解析内容</param>
/// <returns>slabId遍历器</returns>
static IEnumerable<String> ParseStatsItems(String contentAsString)
{
var slabIds = new List<String>();
var separator = "\r\n";
var separator2 = ':';
var items = contentAsString.Split(separator, StringSplitOptions.RemoveEmptyEntries);
for (Int32 i = 0; i < items.Length; i += 4)
{
var itemParts = items.Split(separator2, StringSplitOptions.RemoveEmptyEntries);
if (itemParts.Length < 3)
continue;
slabIds.Add(itemParts[1]);
}
return slabIds;
}
/// <summary>
/// 查询键
/// </summary>
/// <param name="socket">套接字</param>
/// <param name="slabIdIter">被查询slabId</param>
/// <returns>键遍历器</returns>
static IEnumerable<String> QueryKeys(Socket socket, IEnumerable<String> slabIdIter)
{
var keys = new List<String>();
var cmdFmt = "stats cachedump {0} 200000 ITEM views.decorators.cache.cache_header..cc7d9 [6 b; 1256056128 s] \r\n";
var contentAsString = String.Empty;
foreach (String slabId in slabIdIter)
{
contentAsString = ExecuteScalarAsString(socket, String.Format(cmdFmt, slabId));
keys.AddRange(ParseKeys(contentAsString));
}
return keys;
}
/// <summary>
/// 解析stats cachedump返回键
/// </summary>
/// <param name="contentAsString">解析内容</param>
/// <returns>键遍历器</returns>
static IEnumerable<String> ParseKeys(String contentAsString)
{
var keys = new List<String>();
var separator = "\r\n";
var separator2 = ' ';
var prefix = "ITEM";
var items = contentAsString.Split(separator, StringSplitOptions.RemoveEmptyEntries);
foreach (var item in items)
{
var itemParts = item.Split(separator2, StringSplitOptions.RemoveEmptyEntries);
if ((itemParts.Length < 3) || !String.Equals(itemParts.FirstOrDefault(), prefix, StringComparison.OrdinalIgnoreCase))
continue;
keys.Add(itemParts[1]);
}
return keys;
}
}
/// <summary>
/// String扩展函数
/// </summary>
static class StringExtension
{
/// <summary>
/// 切割
/// </summary>
/// <param name="str">字符串</param>
/// <param name="separator">分隔符</param>
/// <param name="options">选项</param>
/// <returns>切割结果</returns>
public static String[] Split(this String str, Char separator, StringSplitOptions options)
{
return str.Split(new Char[] { separator }, options);
}
/// <summary>
/// 切割
/// </summary>
/// <param name="str">字符串</param>
/// <param name="separator">分隔符</param>
/// <param name="options">选项</param>
/// <returns>切割结果</returns>
public static String[] Split(this String str, String separator, StringSplitOptions options)
{
return str.Split(new String[] { separator }, options);
}
}