1 # -*- encoding: binary -*-
2 require 'mogilefs/client'
3 require 'mogilefs/util'
4 require 'mogilefs/http_reader'
7 # MogileFS File manipulation client.
9 class MogileFS::MogileFS < MogileFS::Client
11 include MogileFS::Bigfile
14 # The domain of keys for this MogileFS client.
19 # The timeout for get_file_data. Defaults to five seconds.
21 attr_accessor :get_file_data_timeout
24 # Creates a new MogileFS::MogileFS instance. +args+ must include a key
25 # :domain specifying the domain of this client.
27 def initialize(args = {})
28 @domain = args[:domain]
30 @get_file_data_timeout = 5
32 raise ArgumentError, "you must specify a domain" unless @domain
34 if @backend = args[:db_backend]
42 # Enumerates keys starting with +key+.
47 keys, after = list_keys prefix
49 until keys.nil? or keys.empty? do
50 keys.each { |k| yield k }
51 keys, after = list_keys prefix, after
58 # Retrieves the contents of +key+.
60 def get_file_data(key)
61 paths = get_paths(key)
62 sock = MogileFS::HTTPReader.first(paths, "GET", @get_file_data_timeout)
63 block_given? ? yield(sock) : sock.to_s
67 # Get the paths for +key+.
69 def get_paths(key, noverify = true, zone = nil)
70 opts = { :domain => @domain, :key => key,
71 :noverify => noverify ? 1 : 0, :zone => zone }
72 @backend.respond_to?(:_get_paths) and return @backend._get_paths(opts)
73 res = @backend.get_paths(opts)
74 (1..res['paths'].to_i).map { |i| res["path#{i}"] }.compact
78 # Get the URIs for +key+.
80 def get_uris(key, noverify = true, zone = nil)
81 get_paths(key, noverify, zone).map { |path| URI.parse(path) }
85 # Creates a new file +key+ in +klass+. +bytes+ is currently unused.
87 # The +block+ operates like File.open.
89 def new_file(key, klass = nil, bytes = 0) # :yields: file
90 raise MogileFS::ReadOnlyError if readonly?
91 opts = { :domain => @domain, :key => key, :multi_dest => 1 }
92 opts[:class] = klass if klass && klass != "default"
93 res = @backend.create_open(opts)
95 dests = if dev_count = res['dev_count'] # multi_dest succeeded
96 (1..dev_count.to_i).map do |i|
97 [res["devid_#{i}"], res["path_#{i}"]]
99 else # single destination returned
100 # 0x0040: d0e4 4f4b 2064 6576 6964 3d31 2666 6964 ..OK.devid=1&fid
101 # 0x0050: 3d33 2670 6174 683d 6874 7470 3a2f 2f31 =3&path=http://1
102 # 0x0060: 3932 2e31 3638 2e31 2e37 323a 3735 3030 92.168.1.72:7500
103 # 0x0070: 2f64 6576 312f 302f 3030 302f 3030 302f /dev1/0/000/000/
104 # 0x0080: 3030 3030 3030 3030 3033 2e66 6964 0d0a 0000000003.fid..
106 [[res['devid'], res['path']]]
109 case (dests[0][1] rescue nil)
110 when /^http:\/\// then
111 http_file = MogileFS::HTTPFile.new(dests, bytes)
113 rv = http_file.commit
114 @backend.create_close(:fid => res['fid'],
115 :devid => http_file.devid,
118 :path => http_file.uri.to_s,
122 raise MogileFS::EmptyPathError,
123 "Empty path for mogile upload res=#{res.inspect}"
125 raise MogileFS::UnsupportedPathError,
126 "paths '#{dests.inspect}' returned by backend is not supported"
131 # Copies the contents of +file+ into +key+ in class +klass+. +file+ can be
132 # either a path name (String or Pathname object) or an object that
133 # responds to #readpartial. Returns size of +file+ stored
135 def store_file(key, klass, file)
136 raise MogileFS::ReadOnlyError if readonly?
138 new_file(key, klass) { |mfp| mfp.big_io = file }
142 # Stores +content+ into +key+ in class +klass+.
144 def store_content(key, klass, content)
145 raise MogileFS::ReadOnlyError if readonly?
147 new_file key, klass do |mfp|
148 if content.is_a?(MogileFS::Util::StoreContent)
149 mfp.streaming_io = content
162 raise MogileFS::ReadOnlyError if readonly?
164 @backend.delete :domain => @domain, :key => key
172 @backend.sleep :duration => duration
176 # Renames a key +from+ to key +to+.
179 raise MogileFS::ReadOnlyError if readonly?
181 @backend.rename :domain => @domain, :from_key => from, :to_key => to
186 # Returns the size of +key+.
188 @backend.respond_to?(:_size) and return @backend._size(domain, key)
189 paths = get_paths(key)
193 def paths_size(paths)
194 sock = MogileFS::HTTPReader.first(paths, "HEAD", @get_file_data_timeout)
199 # Lists keys starting with +prefix+ follwing +after+ up to +limit+. If
200 # +after+ is nil the list starts at the beginning.
202 def list_keys(prefix, after = nil, limit = 1000, &block)
203 if @backend.respond_to?(:_list_keys)
204 return @backend._list_keys(domain, prefix, after, limit, &block)
208 @backend.list_keys(:domain => domain, :prefix => prefix,
209 :after => after, :limit => limit)
210 rescue MogileFS::Backend::NoneMatchError
214 keys = (1..res['key_count'].to_i).map { |i| res["key_#{i}"] }
216 # emulate the MogileFS::Mysql interface, slowly...
218 paths = get_paths(key)
219 length = paths_size(paths)
220 yield key, length, paths.size
224 [ keys, res['next_after'] ]