private (object Value, string Error) ReadResponse()
{
var line = m_pClient.ReadLine();
switch (line[0])
{
case '*': // multi-bulk reply
int count = int.Parse(line.Substring(1));
if (count <= 0)
{
return(null, null);
}
var list = new object[count];
for (int i = 0; i < count; i++)
{
var record = ReadResponse();
if (record.Error != null)
{
return(null, record.Error);
}
list[i] = record.Value;
}
return(list, null);
case '$': // bulk reply
int size = int.Parse(line.Substring(1));
if (size <= 0)
{
if (size == 0)
{
return(new byte[0], null);
}
return(null, null);
}
var buffer = new byte[size];
using (var toStream = new MemoryStream())
{
FixedCountReader.Read(m_pClient.TcpStream, toStream, size);
buffer = toStream.ToArray();
}
m_pClient.ReadLine(); // remove end crlf.
return(buffer, null);
case '+': // status reply
return(line.Substring(1), null);
case ':': // integer reply
return(int.Parse(line.Substring(1)), null);
case '-': // error reply
return(null, line.Split(' ', 2)[1]);
default: // unknown reply
return(null, $"unknown response: {line}");
}
}
private MemcachedCacheItem[] ExecGetCommand(string cmd, string[] keys)
{
ThrowIfObjectDisposed();
ThrowIfNotConnected();
try
{
m_pClient.WriteLine($"{cmd} {string.Join(" ", keys)}");
var list = new List <MemcachedCacheItem>();
while (true)
{
string line = m_pClient.ReadLine();
if (line == string.Empty)
{
line = m_pClient.ReadLine();
}
if (line.Equals(END, StringComparison.InvariantCultureIgnoreCase))
{
break;
}
if (line.Equals(ERROR, StringComparison.InvariantCultureIgnoreCase)) // not happended yet.
{
throw new Exception($"Error.");
}
if (line.StartsWith(CLIENT_ERROR, StringComparison.InvariantCultureIgnoreCase))
{
throw new Exception($"Client error: {line.Split(' ', 2)[1]}");
}
if (line.StartsWith(SERVER_ERROR, StringComparison.InvariantCultureIgnoreCase))
{
throw new Exception($"Server error: {line.Split(' ', 2)[1]}");
}
if (!line.StartsWith(VALUE, StringComparison.InvariantCultureIgnoreCase))
{
throw new NotSupportedException($"Unsupported response: {line}");
}
var items = line.Split(' ', 5, StringSplitOptions.RemoveEmptyEntries);
var kvItem = new MemcachedCacheItem();
kvItem.Key = items[1];
kvItem.Flags = int.Parse(items[2]);
kvItem.Length = int.Parse(items[3]);
kvItem.Revision = items.Length > 4 ? int.Parse(items[4]) : 0;
using (var toStream = new MemoryStream())
{
FixedCountReader.Read(m_pClient.TcpStream, toStream, kvItem.Length);
kvItem.ValueBytes = toStream.ToArray();
}
m_pClient.ReadLine(); // remove end crlf.
list.Add(kvItem);
}
return(list.ToArray());
}
catch (SocketException ex)
{
m_pClient.Dispose();
throw ex;
}
catch (IOException ex)
{
m_pClient.Dispose();
throw ex;
}
}