1 require 'mogilefs/client'
2 require 'mogilefs/util'
5 # MogileFS File manipulation client.
7 class MogileFS::MogileFS < MogileFS::Client
10 include MogileFS::Bigfile
13 # The domain of keys for this MogileFS client.
18 # The timeout for get_file_data. Defaults to five seconds.
20 attr_accessor :get_file_data_timeout
23 # Creates a new MogileFS::MogileFS instance. +args+ must include a key
24 # :domain specifying the domain of this client.
26 def initialize(args = {})
27 @domain = args[:domain]
29 @get_file_data_timeout = 5
31 raise ArgumentError, "you must specify a domain" unless @domain
33 if @backend = args[:db_backend]
41 # Enumerates keys starting with +key+.
46 keys, after = list_keys prefix
48 until keys.nil? or keys.empty? do
49 keys.each { |k| yield k }
50 keys, after = list_keys prefix, after
57 # Retrieves the contents of +key+.
59 def get_file_data(key, &block)
60 paths = get_paths(key) or return nil
63 sock = http_read_sock(URI.parse(path))
65 return yield(sock) if block_given?
66 return sysread_full(sock, sock.mogilefs_size, @get_file_data_timeout)
70 rescue MogileFS::Timeout, MogileFS::InvalidResponseError,
71 Errno::ECONNREFUSED, EOFError, SystemCallError
78 # Get the paths for +key+.
80 def get_paths(key, noverify = true, zone = nil)
81 opts = { :domain => @domain, :key => key,
82 :noverify => noverify ? 1 : 0, :zone => zone }
83 @backend.respond_to?(:_get_paths) and return @backend._get_paths(opts)
84 res = @backend.get_paths(opts)
85 (1..res['paths'].to_i).map { |i| res["path#{i}"] }.compact
89 # Creates a new file +key+ in +klass+. +bytes+ is currently unused.
91 # The +block+ operates like File.open.
93 def new_file(key, klass = nil, bytes = 0, &block) # :yields: file
94 raise MogileFS::ReadOnlyError if readonly?
95 opts = { :domain => @domain, :key => key, :multi_dest => 1 }
96 opts[:class] = klass if klass
97 res = @backend.create_open(opts)
99 dests = if dev_count = res['dev_count'] # multi_dest succeeded
100 (1..dev_count.to_i).map do |i|
101 [res["devid_#{i}"], res["path_#{i}"]]
103 else # single destination returned
104 # 0x0040: d0e4 4f4b 2064 6576 6964 3d31 2666 6964 ..OK.devid=1&fid
105 # 0x0050: 3d33 2670 6174 683d 6874 7470 3a2f 2f31 =3&path=http://1
106 # 0x0060: 3932 2e31 3638 2e31 2e37 323a 3735 3030 92.168.1.72:7500
107 # 0x0070: 2f64 6576 312f 302f 3030 302f 3030 302f /dev1/0/000/000/
108 # 0x0080: 3030 3030 3030 3030 3033 2e66 6964 0d0a 0000000003.fid..
110 [[res['devid'], res['path']]]
113 case (dests[0][1] rescue nil)
115 raise MogileFS::EmptyPathError
116 when /^http:\/\// then
117 MogileFS::HTTPFile.open(self, res['fid'], klass, key,
118 dests, bytes, &block)
120 raise MogileFS::UnsupportedPathError,
121 "paths '#{dests.inspect}' returned by backend is not supported"
126 # Copies the contents of +file+ into +key+ in class +klass+. +file+ can be
127 # either a file name or an object that responds to #read.
129 def store_file(key, klass, file)
130 raise MogileFS::ReadOnlyError if readonly?
132 new_file key, klass do |mfp|
133 if file.respond_to? :sysread then
134 return sysrwloop(file, mfp)
136 if File.size(file) > 0x10000 # Bigass file, handle differently
140 return File.open(file, "rb") { |fp| sysrwloop(fp, mfp) }
147 # Stores +content+ into +key+ in class +klass+.
149 def store_content(key, klass, content)
150 raise MogileFS::ReadOnlyError if readonly?
152 new_file key, klass do |mfp|
153 if content.is_a?(MogileFS::Util::StoreContent)
154 mfp.streaming_io = content
167 raise MogileFS::ReadOnlyError if readonly?
169 @backend.delete :domain => @domain, :key => key
176 @backend.sleep :duration => duration
180 # Renames a key +from+ to key +to+.
183 raise MogileFS::ReadOnlyError if readonly?
185 @backend.rename :domain => @domain, :from_key => from, :to_key => to
190 # Returns the size of +key+.
192 @backend.respond_to?(:_size) and return @backend._size(domain, key)
193 paths = get_paths(key) or return nil
197 def paths_size(paths)
200 return http_read_sock(URI.parse(path), "HEAD").mogilefs_size
201 rescue MogileFS::InvalidResponseError, MogileFS::Timeout,
202 Errno::ECONNREFUSED, EOFError, SystemCallError => err
210 # Lists keys starting with +prefix+ follwing +after+ up to +limit+. If
211 # +after+ is nil the list starts at the beginning.
213 def list_keys(prefix, after = nil, limit = 1000, &block)
214 if @backend.respond_to?(:_list_keys)
215 return @backend._list_keys(domain, prefix, after, limit, &block)
219 @backend.list_keys(:domain => domain, :prefix => prefix,
220 :after => after, :limit => limit)
221 rescue MogileFS::Backend::NoneMatchError
225 keys = (1..res['key_count'].to_i).map { |i| res["key_#{i}"] }
227 # emulate the MogileFS::Mysql interface, slowly...
229 paths = get_paths(key) or next
230 length = paths_size(paths) or next
231 yield key, length, paths.size
235 [ keys, res['next_after'] ]
240 # given a URI, this returns a readable socket with ready data from the
241 # body of the response.
242 def http_read_sock(uri, http_method = "GET")
243 sock = Socket.mogilefs_new_request(uri.host, uri.port,
244 "#{http_method} #{uri.request_uri} HTTP/1.0\r\n\r\n",
245 @get_file_data_timeout)
246 buf = sock.recv_nonblock(4096, Socket::MSG_PEEK)
247 head, body = buf.split(/\r\n\r\n/, 2)
249 # we're dealing with a seriously slow/stupid HTTP server if we can't
250 # get the header in a single read(2) syscall.
251 if head =~ %r{\AHTTP/\d+\.\d+\s+200\s*} &&
252 head =~ %r{^Content-Length:\s*(\d+)}i
253 sock.mogilefs_size = $1.to_i
255 when "HEAD" then sock.close
256 when "GET" then sock.recv(head.size + 4, 0)
260 sock.close rescue nil
261 raise MogileFS::InvalidResponseError,
262 "#{http_method} on #{uri} returned: #{head.inspect}"
263 end # def http_read_sock