1 # -*- encoding: binary -*-
4 # MogileFS File manipulation client.
6 class MogileFS::MogileFS < MogileFS::Client
8 include MogileFS::Bigfile
11 # The domain of keys for this MogileFS client.
16 # The timeout for get_file_data. Defaults to five seconds.
18 attr_accessor :get_file_data_timeout
21 # Creates a new MogileFS::MogileFS instance. +args+ must include a key
22 # :domain specifying the domain of this client.
24 def initialize(args = {})
25 @domain = args[:domain]
28 @get_file_data_timeout = 5
30 raise ArgumentError, "you must specify a domain" unless @domain
32 if @backend = args[:db_backend]
40 # Enumerates keys starting with +key+.
42 def each_key(prefix = "")
45 keys, after = list_keys prefix
47 until keys.nil? or keys.empty? do
48 keys.each { |k| yield k }
49 keys, after = list_keys prefix, after
56 # Retrieves the contents of +key+. If +dest+ is specified, +dest+
57 # should be an IO-like object capable of receiving the +write+ method
60 def get_file_data(key, dest = nil)
61 paths = get_paths(key)
62 sock = MogileFS::HTTPReader.first(paths, @get_file_data_timeout)
64 MogileFS::X.copy_stream(sock, dest)
71 sock.close unless sock.closed?
75 # Get the paths for +key+.
77 def get_paths(key, *args)
86 opts[:noverify] = args[:noverify]
87 opts[:zone] = args[:zone]
88 pathcount = args[:pathcount] and opts[:pathcount] = pathcount.to_i
92 opts[:noverify] = opts[:noverify] ? 1 : 0
93 @backend.respond_to?(:_get_paths) and return @backend._get_paths(opts)
94 res = @backend.get_paths(opts)
95 (1..res['paths'].to_i).map { |i| res["path#{i}"] }.compact
99 # Get the URIs for +key+.
101 def get_uris(key, *args)
102 get_paths(key, *args).map! { |path| URI.parse(path) }
106 # Creates a new file +key+ in +klass+. +bytes+ is currently unused.
108 # The +block+ operates like File.open.
110 def new_file(key, klass = nil, bytes = 0) # :yields: file
111 raise MogileFS::ReadOnlyError if readonly?
112 opts = { :domain => @domain, :key => key, :multi_dest => 1 }
113 opts[:class] = klass if klass && klass != "default"
114 res = @backend.create_open(opts)
116 dests = if dev_count = res['dev_count'] # multi_dest succeeded
117 (1..dev_count.to_i).map do |i|
118 [res["devid_#{i}"], res["path_#{i}"]]
120 else # single destination returned
121 # 0x0040: d0e4 4f4b 2064 6576 6964 3d31 2666 6964 ..OK.devid=1&fid
122 # 0x0050: 3d33 2670 6174 683d 6874 7470 3a2f 2f31 =3&path=http://1
123 # 0x0060: 3932 2e31 3638 2e31 2e37 323a 3735 3030 92.168.1.72:7500
124 # 0x0070: 2f64 6576 312f 302f 3030 302f 3030 302f /dev1/0/000/000/
125 # 0x0080: 3030 3030 3030 3030 3033 2e66 6964 0d0a 0000000003.fid..
127 [[res['devid'], res['path']]]
130 case (dests[0][1] rescue nil)
131 when /^http:\/\// then
132 http_file = MogileFS::HTTPFile.new(dests, bytes)
134 rv = http_file.commit
135 @backend.create_close(:fid => res['fid'],
136 :devid => http_file.devid,
139 :path => http_file.uri.to_s,
143 raise MogileFS::EmptyPathError,
144 "Empty path for mogile upload res=#{res.inspect}"
146 raise MogileFS::UnsupportedPathError,
147 "paths '#{dests.inspect}' returned by backend is not supported"
152 # Copies the contents of +file+ into +key+ in class +klass+. +file+ can be
153 # either a path name (String or Pathname object) or an IO-like object that
154 # responds to #read or #readpartial. Returns size of +file+ stored.
156 def store_file(key, klass, file)
157 raise MogileFS::ReadOnlyError if readonly?
159 new_file(key, klass) { |mfp| mfp.big_io = file }
163 # Stores +content+ into +key+ in class +klass+.
165 def store_content(key, klass, content)
166 raise MogileFS::ReadOnlyError if readonly?
168 new_file key, klass do |mfp|
169 if content.is_a?(MogileFS::Util::StoreContent)
170 mfp.streaming_io = content
181 raise MogileFS::ReadOnlyError if readonly?
183 @backend.delete :domain => @domain, :key => key
191 @backend.sleep :duration => duration
195 # Renames a key +from+ to key +to+.
198 raise MogileFS::ReadOnlyError if readonly?
200 @backend.rename :domain => @domain, :from_key => from, :to_key => to
205 # Returns the size of +key+.
207 @backend.respond_to?(:_size) and return @backend._size(domain, key)
209 file_info(key)["length"].to_i
210 rescue MogileFS::Backend::UnknownCommandError
211 paths_size(get_paths(key))
215 def paths_size(paths) # :nodoc:
216 require "mogilefs/paths_size"
217 MogileFS::PathsSize.call(paths)
221 # Lists keys starting with +prefix+ follwing +after+ up to +limit+. If
222 # +after+ is nil the list starts at the beginning.
224 def list_keys(prefix = "", after = nil, limit = 1000)
225 if @backend.respond_to?(:_list_keys)
226 block_given? or return @backend._list_keys(domain, prefix, after, limit)
227 return @backend._list_keys(domain, prefix, after, limit) do |*a|
233 @backend.list_keys(:domain => domain, :prefix => prefix,
234 :after => after, :limit => limit)
235 rescue MogileFS::Backend::NoneMatchError
239 keys = (1..res['key_count'].to_i).map { |i| res["key_#{i}"] }
241 # emulate the MogileFS::Mysql interface, slowly...
245 rescue MogileFS::Backend::UnknownCommandError # MogileFS < 2.45
246 paths = get_paths(key)
247 res = { "length" => paths_size(paths), "devcount" => paths.size }
249 yield key, res["length"], res["devcount"]
253 [ keys, res['next_after'] ]
256 # Return metadata about a file as a hash.
257 # Returns the domain, class, expected length, devcount, etc.
258 # Optionally device ids (not paths) can be returned as
259 # well if :devices is specified and +true+.
261 # This should only be used for informational purposes, and not usually
262 # for dynamically serving files.
263 def file_info(key, args = nil)
264 opts = { :domain => @domain, :key => key }
265 args and devices = args[:devices] and opts[:devices] = devices ? 1 : 0
266 rv = @backend.file_info(opts)
267 %w(fid length devcount).each { |f| rv[f] = rv[f].to_i }
268 devids = rv["devids"] and
269 rv["devids"] = devids.split(/,/).map! { |x| x.to_i }
273 # Given an Integer +fid+ or String +key+ and domain, thorougly search
274 # the database for all occurences of a particular fid.
276 # Use this sparingly, this command hits the master database numerous
277 # times and is very expensive. This is not for production use, only
278 # troubleshooting and debugging.
280 # Searches for fid=666:
282 # client.file_debug(666)
284 # Search for key=foo using the default domain for this object:
286 # client.file_debug("foo")
288 # Search for key=foo in domain="bar":
290 # client.file_debug(:key => "foo", :domain => "bar")
294 when Integer then args = { "fid" => args }
295 when String then args = { "key" => args }
297 opts = { :domain => args[:domain] || @domain }.merge!(args)
299 rv = @backend.file_debug(opts)
302 when /_(?:classid|devcount|dmid|fid|length|
303 nexttry|fromdevid|failcount|flags|devid|type)\z/x
306 rv[k] = v.split(/,/).map! { |x| x.to_i }