MogileFS::MogileFS#get_file_data

updated:
修改 thumbo 不要用 get_file_data 比把他修好快：
don't use Mogilefs::Mogilefs#get_file_data, it's broken. detail:
* use curb and falls back to open-uri instead, wrapped with timeout.

[#24481] MogileFS::MogileFS#get_file_data can't read all data (sometimes)
[quote="me"]

http://git.bogomips.org/cgit/mogilefs-client.git/tree/lib/mogilefs/mogilefs.rb#n74
in lib/mogilefs/mogilefs.rb: 74,

return block_given? ? yield(sock) : sock.read

`sock.read' can't read all data from server sometimes.
Perhaps it needs IO.select([sock]) and read all
data until there's no remaining data.

I think we could use curb or something else and
falls back to net/http, instead of playing with
low level socket.

http://pivotallabs.com/users/steve/blog/articles/644-net-http-alternatives

Thanks!

Jen-Shin

[/quote]

這邊無視 timeout 的話，應該改成碰上 Errno::EAGAIN 重新
IO.select, 而接著一直 read 到沒有東西為止。

result = ''
begin
  result << buff while (buff = sock.read).size != 0
  return result
rescue Errno::EAGAIN
  IO.select([sock])
  retry
end

暫時用 curb 做 workaround 吧...
如：

timeout(@time){Curl::Easy.perform('godfat.org').body_str}