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]
27 @get_file_data_timeout = 5
29 raise ArgumentError, "you must specify a domain" unless @domain
31 if @backend = args[:db_backend]
39 # Enumerates keys starting with +key+.
41 def each_key(prefix = "")
44 keys, after = list_keys prefix
46 until keys.nil? or keys.empty? do
47 keys.each { |k| yield k }
48 keys, after = list_keys prefix, after
55 # Retrieves the contents of +key+. If +dest+ is specified, +dest+
56 # should be an IO-like object capable of receiving the +write+ method
59 def get_file_data(key, dest = nil)
60 paths = get_paths(key)
61 sock = MogileFS::HTTPReader.first(paths, "GET", @get_file_data_timeout)
63 MogileFS::X.copy_stream(sock, dest)
70 sock.close unless sock.closed?
74 # Get the paths for +key+.
76 def get_paths(key, noverify = true, zone = nil)
77 opts = { :domain => @domain, :key => key,
78 :noverify => noverify ? 1 : 0, :zone => zone }
79 @backend.respond_to?(:_get_paths) and return @backend._get_paths(opts)
80 res = @backend.get_paths(opts)
81 (1..res['paths'].to_i).map { |i| res["path#{i}"] }.compact
85 # Get the URIs for +key+.
87 def get_uris(key, noverify = true, zone = nil)
88 get_paths(key, noverify, zone).map { |path| URI.parse(path) }
92 # Creates a new file +key+ in +klass+. +bytes+ is currently unused.
94 # The +block+ operates like File.open.
96 def new_file(key, klass = nil, bytes = 0) # :yields: file
97 raise MogileFS::ReadOnlyError if readonly?
98 opts = { :domain => @domain, :key => key, :multi_dest => 1 }
99 opts[:class] = klass if klass && klass != "default"
100 res = @backend.create_open(opts)
102 dests = if dev_count = res['dev_count'] # multi_dest succeeded
103 (1..dev_count.to_i).map do |i|
104 [res["devid_#{i}"], res["path_#{i}"]]
106 else # single destination returned
107 # 0x0040: d0e4 4f4b 2064 6576 6964 3d31 2666 6964 ..OK.devid=1&fid
108 # 0x0050: 3d33 2670 6174 683d 6874 7470 3a2f 2f31 =3&path=http://1
109 # 0x0060: 3932 2e31 3638 2e31 2e37 323a 3735 3030 92.168.1.72:7500
110 # 0x0070: 2f64 6576 312f 302f 3030 302f 3030 302f /dev1/0/000/000/
111 # 0x0080: 3030 3030 3030 3030 3033 2e66 6964 0d0a 0000000003.fid..
113 [[res['devid'], res['path']]]
116 case (dests[0][1] rescue nil)
117 when /^http:\/\// then
118 http_file = MogileFS::HTTPFile.new(dests, bytes)
120 rv = http_file.commit
121 @backend.create_close(:fid => res['fid'],
122 :devid => http_file.devid,
125 :path => http_file.uri.to_s,
129 raise MogileFS::EmptyPathError,
130 "Empty path for mogile upload res=#{res.inspect}"
132 raise MogileFS::UnsupportedPathError,
133 "paths '#{dests.inspect}' returned by backend is not supported"
138 # Copies the contents of +file+ into +key+ in class +klass+. +file+ can be
139 # either a path name (String or Pathname object) or an IO-like object that
140 # responds to #read or #readpartial. Returns size of +file+ stored.
142 def store_file(key, klass, file)
143 raise MogileFS::ReadOnlyError if readonly?
145 new_file(key, klass) { |mfp| mfp.big_io = file }
149 # Stores +content+ into +key+ in class +klass+.
151 def store_content(key, klass, content)
152 raise MogileFS::ReadOnlyError if readonly?
154 new_file key, klass do |mfp|
155 if content.is_a?(MogileFS::Util::StoreContent)
156 mfp.streaming_io = content
167 raise MogileFS::ReadOnlyError if readonly?
169 @backend.delete :domain => @domain, :key => key
177 @backend.sleep :duration => duration
181 # Renames a key +from+ to key +to+.
184 raise MogileFS::ReadOnlyError if readonly?
186 @backend.rename :domain => @domain, :from_key => from, :to_key => to
191 # Returns the size of +key+.
193 @backend.respond_to?(:_size) and return @backend._size(domain, key)
195 file_info(key)["length"].to_i
196 rescue MogileFS::Backend::UnknownCommandError
197 paths_size(get_paths(key))
201 def paths_size(paths)
202 sock = MogileFS::HTTPReader.first(paths, "HEAD", @get_file_data_timeout)
207 # Lists keys starting with +prefix+ follwing +after+ up to +limit+. If
208 # +after+ is nil the list starts at the beginning.
210 def list_keys(prefix = "", after = nil, limit = 1000)
211 if @backend.respond_to?(:_list_keys)
212 block_given? or return @backend._list_keys(domain, prefix, after, limit)
213 return @backend._list_keys(domain, prefix, after, limit) do |*a|
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...
231 rescue MogileFS::Backend::UnknownCommandError # MogileFS < 2.45
232 paths = get_paths(key)
233 res = { "length" => paths_size(paths), "devcount" => paths.size }
235 yield key, res["length"], res["devcount"]
239 [ keys, res['next_after'] ]
242 # Return metadata about a file as a hash.
243 # Returns the domain, class, expected length, devcount, etc.
244 # Optionally device ids (not paths) can be returned as
245 # well if :devices is specified and +true+.
247 # This should only be used for informational purposes, and not usually
248 # for dynamically serving files.
249 def file_info(key, args = nil)
250 opts = { :domain => @domain, :key => key }
251 args and devices = args[:devices] and opts[:devices] = devices ? 1 : 0
252 rv = @backend.file_info(opts)
253 %w(fid length devcount).each { |f| rv[f] = rv[f].to_i }
254 devids = rv["devids"] and
255 rv["devids"] = devids.split(/,/).map! { |x| x.to_i }
259 # Given an Integer +fid+ or String +key+ and domain, thorougly search
260 # the database for all occurences of a particular fid.
262 # Use this sparingly, this command hits the master database numerous
263 # times and is very expensive. This is not for production use, only
264 # troubleshooting and debugging.
266 # Searches for fid=666:
268 # client.file_debug(666)
270 # Search for key=foo using the default domain for this object:
272 # client.file_debug("foo")
274 # Search for key=foo in domain="bar":
276 # client.file_debug(:key => "foo", :domain => "bar")
280 when Integer then args = { "fid" => args }
281 when String then args = { "key" => args }
283 opts = { :domain => args[:domain] || @domain }.merge!(args)
285 rv = @backend.file_debug(opts)
288 when /_(?:classid|devcount|dmid|fid|length|
289 nexttry|fromdevid|failcount|flags|devid|type)\z/x
292 rv[k] = v.split(/,/).map! { |x| x.to_i }