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)
62 return nil unless paths
67 when /^http:\/\// then
69 sock = http_get_sock(URI.parse(path))
70 return block_given? ? yield(sock) : sock.read
71 rescue MogileFS::Timeout, Errno::ECONNREFUSED,
72 EOFError, SystemCallError
76 next unless File.exist? path
77 return File.read(path)
85 # Get the paths for +key+.
87 def get_paths(key, noverify = true, zone = nil)
88 noverify = noverify ? 1 : 0
89 res = @backend.get_paths(:domain => @domain, :key => key,
90 :noverify => noverify, :zone => zone)
91 paths = (1..res['paths'].to_i).map { |i| res["path#{i}"] }
92 return paths if paths.empty?
93 return paths if paths.first =~ /^http:\/\//
97 # Creates a new file +key+ in +klass+. +bytes+ is currently unused.
99 # The +block+ operates like File.open.
101 def new_file(key, klass, bytes = 0, &block) # :yields: file
102 raise MogileFS::ReadOnlyError if readonly?
104 res = @backend.create_open(:domain => @domain, :class => klass,
105 :key => key, :multi_dest => 1)
109 if res.include? 'dev_count' then # HACK HUH?
110 dests = (1..res['dev_count'].to_i).map do |i|
111 [res["devid_#{i}"], res["path_#{i}"]]
114 # 0x0040: d0e4 4f4b 2064 6576 6964 3d31 2666 6964 ..OK.devid=1&fid
115 # 0x0050: 3d33 2670 6174 683d 6874 7470 3a2f 2f31 =3&path=http://1
116 # 0x0060: 3932 2e31 3638 2e31 2e37 323a 3735 3030 92.168.1.72:7500
117 # 0x0070: 2f64 6576 312f 302f 3030 302f 3030 302f /dev1/0/000/000/
118 # 0x0080: 3030 3030 3030 3030 3033 2e66 6964 0d0a 0000000003.fid..
120 dests = [[res['devid'], res['path']]]
128 raise MogileFS::EmptyPathError
129 when /^http:\/\// then
130 MogileFS::HTTPFile.open(self, res['fid'], path, devid, klass, key,
131 dests, bytes, &block)
133 raise MogileFS::UnsupportedPathError,
134 "path '#{path}' returned by backend is not supported"
139 # Copies the contents of +file+ into +key+ in class +klass+. +file+ can be
140 # either a file name or an object that responds to #read.
142 def store_file(key, klass, file)
143 raise MogileFS::ReadOnlyError if readonly?
145 new_file key, klass do |mfp|
146 if file.respond_to? :sysread then
147 return sysrwloop(file, mfp)
149 if File.size(file) > 0x10000 # Bigass file, handle differently
153 return File.open(file) { |fp| sysrwloop(fp, mfp) }
160 # Stores +content+ into +key+ in class +klass+.
162 def store_content(key, klass, content)
163 raise MogileFS::ReadOnlyError if readonly?
165 new_file key, klass do |mfp|
169 return content.length
176 raise MogileFS::ReadOnlyError if readonly?
178 @backend.delete :domain => @domain, :key => key
185 @backend.sleep :duration => duration
189 # Renames a key +from+ to key +to+.
192 raise MogileFS::ReadOnlyError if readonly?
194 @backend.rename :domain => @domain, :from_key => from, :to_key => to
199 # Returns the size of +key+.
201 @backend.respond_to?(:_size) and return @backend._size(domain, key)
202 paths = get_paths(key) or return nil
206 def paths_size(paths)
210 when /^http:\/\// then
213 s = Socket.mogilefs_new_request(url.host, url.port,
214 "HEAD #{url.request_uri} HTTP/1.0\r\n\r\n",
215 @get_file_data_timeout)
216 res = s.recv(4096, 0)
218 if cl = /^Content-Length:\s*(\d+)/i.match(res)
222 rescue MogileFS::Timeout, Errno::ECONNREFUSED,
223 EOFError, SystemCallError
227 next unless File.exist? path
228 return File.size(path)
236 # Lists keys starting with +prefix+ follwing +after+ up to +limit+. If
237 # +after+ is nil the list starts at the beginning.
239 def list_keys(prefix, after = nil, limit = 1000, &block)
240 if @backend.respond_to?(:_list_keys)
241 return @backend._list_keys(domain, prefix, after, limit, &block)
245 @backend.list_keys(:domain => domain, :prefix => prefix,
246 :after => after, :limit => limit)
247 rescue MogileFS::Backend::NoneMatchError
251 keys = (1..res['key_count'].to_i).map { |i| res["key_#{i}"] }
253 # emulate the MogileFS::Mysql interface, slowly...
255 paths = get_paths(key) or next
256 length = paths_size(paths) or next
257 yield key, length, paths.size
261 return keys, res['next_after']
266 def http_get_sock(uri)
267 sock = Socket.mogilefs_new_request(uri.host, uri.port,
268 "GET #{uri.request_uri} HTTP/1.0\r\n\r\n",
269 @get_file_data_timeout)
270 buf = sock.recv(4096, Socket::MSG_PEEK)
271 head, body = buf.split(/\r\n\r\n/, 2)
272 head = sock.recv(head.size + 4, 0)
275 end # def http_get_sock