1 # -*- encoding: binary -*-
2 # internal implementation details here, do not rely on them in your code
4 # This class is needed because Net::HTTP streaming is still inefficient
5 # for reading huge response bodies over fast LANs.
6 class MogileFS::HTTPReader < MogileFS::Socket
7 attr_accessor :content_length, :uri
10 # backwards compat, if anybody cares
11 alias mogilefs_size content_length # :nodoc:
13 # this may OOM your system on large files
16 read(@content_length, buf)
17 return buf if buf.size == @content_length
19 raise MogileFS::SizeMismatchError,
20 "read=#{buf.size} bytes, expected=#@content_length from #@uri", []
23 def self.first(paths, http_method, timeout)
27 sock = new(path, http_method, timeout) and return sock
30 errors << "#{path} failed with #{e.message} (#{e.class})"
33 raise MogileFS::Error,
34 "all paths failed with #{http_method}: #{errors.join(', ')}", []
37 # given a path, this returns a readable socket with ready data from the
38 # body of the response.
39 def self.new(path, http_method, timeout)
41 sock = tcp(uri.host, uri.port, timeout)
42 buf = "#{http_method} #{uri.request_uri} HTTP/1.0\r\n\r\n" # no chunking
43 sock.timed_write(buf, timeout)
45 sock.timed_peek(2048, buf, timeout) or
46 raise MogileFS::InvalidResponseError, "EOF on #{http_method} #{uri}", []
48 head, _ = buf.split(/\r\n\r\n/, 2)
50 # we're dealing with a seriously slow/stupid HTTP server if we can't
51 # get the header in a single recv(2) syscall.
52 if head =~ %r{\AHTTP/\d+\.\d+\s+200\s*} &&
53 head =~ %r{^Content-Length:\s*(\d+)}i
54 sock.content_length = $1.to_i
61 # slice off the top of the socket buffer to allow IO.copy_stream
63 sock.timed_read(head.bytesize + 4, buf, 0)
67 raise MogileFS::InvalidResponseError,
68 "#{http_method} on #{uri} returned: #{head.inspect}", []
70 sock.close unless sock.closed?