471 lines
11 KiB
Ruby
471 lines
11 KiB
Ruby
##
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#
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class GridFS
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const_set :Version, '1.1.1'
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class << GridFS
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def version
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const_get :Version
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end
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def dependencies
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{
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'mongoid' => [ 'mongoid' , ' >= 3.0.1' ] ,
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'mime/types' => [ 'mime-types' , ' >= 1.19' ] ,
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}
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end
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def libdir(*args, &block)
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@libdir ||= File.expand_path(__FILE__).sub(/\.rb$/,'')
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args.empty? ? @libdir : File.join(@libdir, *args)
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ensure
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if block
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begin
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$LOAD_PATH.unshift(@libdir)
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block.call()
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ensure
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$LOAD_PATH.shift()
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end
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end
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end
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def load(*libs)
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libs = libs.join(' ').scan(/[^\s+]+/)
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libdir{ libs.each{|lib| Kernel.load(lib) } }
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end
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end
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begin
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require 'rubygems'
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rescue LoadError
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nil
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end
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if defined?(gem)
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dependencies.each do |lib, dependency|
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gem(*dependency)
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require(lib)
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end
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end
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require "digest/md5"
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require "cgi"
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end
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##
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#
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class GridFS
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class << GridFS
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attr_accessor :namespace
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attr_accessor :file_model
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attr_accessor :chunk_model
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def init!
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GridFS.build_namespace_for(:Fs)
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GridFS.namespace = Fs
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GridFS.file_model = Fs.file_model
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GridFS.chunk_model = Fs.chunk_model
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const_set(:File, Fs.file_model)
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const_set(:Chunk, Fs.chunk_model)
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to_delegate = %w(
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put
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get
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delete
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find
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[]
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[]=
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)
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to_delegate.each do |method|
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class_eval <<-__
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def GridFS.#{ method }(*args, &block)
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::GridFS::Fs::#{ method }(*args, &block)
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end
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__
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end
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end
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end
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##
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#
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def GridFS.namespace_for(prefix)
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prefix = prefix.to_s.downcase
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const = "::GridFS::#{ prefix.to_s.camelize }"
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namespace = const.split(/::/).last
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const_defined?(namespace) ? const_get(namespace) : build_namespace_for(namespace)
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end
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##
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#
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def GridFS.build_namespace_for(prefix)
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prefix = prefix.to_s.downcase
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const = prefix.camelize
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namespace =
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Module.new do
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module_eval(&NamespaceMixin)
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self
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end
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const_set(const, namespace)
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file_model = build_file_model_for(namespace)
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chunk_model = build_chunk_model_for(namespace)
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file_model.namespace = namespace
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chunk_model.namespace = namespace
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file_model.chunk_model = chunk_model
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chunk_model.file_model = file_model
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namespace.prefix = prefix
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namespace.file_model = file_model
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namespace.chunk_model = chunk_model
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namespace.send(:const_set, :File, file_model)
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namespace.send(:const_set, :Chunk, chunk_model)
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#at_exit{ file_model.create_indexes rescue nil }
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#at_exit{ chunk_model.create_indexes rescue nil }
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const_get(const)
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end
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NamespaceMixin = proc do
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class << self
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attr_accessor :prefix
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attr_accessor :file_model
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attr_accessor :chunk_model
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def to_s
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prefix
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end
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def namespace
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prefix
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end
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def put(readable, attributes = {})
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chunks = []
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file = file_model.new
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attributes.to_options!
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if attributes.has_key?(:id)
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file.id = attributes.delete(:id)
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end
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if attributes.has_key?(:_id)
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file.id = attributes.delete(:_id)
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end
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if attributes.has_key?(:content_type)
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attributes[:contentType] = attributes.delete(:content_type)
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end
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if attributes.has_key?(:upload_date)
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attributes[:uploadDate] = attributes.delete(:upload_date)
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end
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md5 = Digest::MD5.new
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length = 0
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chunkSize = file.chunkSize
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n = 0
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GridFS.reading(readable) do |io|
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filename =
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attributes[:filename] ||=
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[file.id.to_s, GridFS.extract_basename(io)].join('/').squeeze('/')
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content_type =
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attributes[:contentType] ||=
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GridFS.extract_content_type(filename) || file.contentType
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while((buf = io.read(chunkSize)))
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md5 << buf
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length += buf.size
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chunk = file.chunks.build
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chunk.data = binary_for(buf)
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chunk.n = n
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n += 1
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chunk.save!
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chunks.push(chunk)
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end
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end
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attributes[:length] ||= length
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attributes[:uploadDate] ||= Time.now.utc
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attributes[:md5] ||= md5.hexdigest
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file.update_attributes(attributes)
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file.save!
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file
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ensure
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chunks.each{|chunk| chunk.destroy rescue nil} if $!
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end
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if defined?(Moped)
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def binary_for(*buf)
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Moped::BSON::Binary.new(:generic, buf.join)
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end
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else
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def binary_for(buf)
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BSON::Binary.new(buf.bytes.to_a)
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end
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end
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def get(id)
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file_model.find(id)
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end
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def delete(id)
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file_model.find(id).destroy
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rescue
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nil
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end
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def where(conditions = {})
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case conditions
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when String
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file_model.where(:filename => conditions)
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else
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file_model.where(conditions)
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end
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end
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def find(*args)
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where(*args).first
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end
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def [](filename)
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file_model.where(:filename => filename.to_s).first
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end
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def []=(filename, readable)
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file = self[filename]
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file.destroy if file
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put(readable, :filename => filename.to_s)
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end
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def clear
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file_model.destroy_all
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end
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# TODO - opening with a mode = 'w' should return a GridIO::IOProxy
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# implementing a StringIO-like interface
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#
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def open(filename, mode = 'r', &block)
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raise NotImplementedError
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end
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end
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end
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##
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#
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def GridFS.build_file_model_for(namespace)
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prefix = namespace.name.split(/::/).last.downcase
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file_model_name = "#{ namespace.name }::File"
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chunk_model_name = "#{ namespace.name }::Chunk"
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Class.new do
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include Mongoid::Document
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singleton_class = class << self; self; end
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singleton_class.instance_eval do
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define_method(:name){ file_model_name }
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attr_accessor :chunk_model
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attr_accessor :namespace
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end
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self.default_collection_name = "#{ prefix }.files"
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field(:filename, :type => String)
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field(:contentType, :type => String, :default => 'application/octet-stream')
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field(:length, :type => Integer, :default => 0)
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field(:chunkSize, :type => Integer, :default => (256 * (2 ** 20)))
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field(:uploadDate, :type => Date, :default => Time.now.utc)
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field(:md5, :type => String, :default => Digest::MD5.hexdigest(''))
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%w( filename contentType length chunkSize uploadDate md5 ).each do |f|
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validates_presence_of(f)
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end
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validates_uniqueness_of(:filename)
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has_many(:chunks, :class_name => chunk_model_name, :inverse_of => :files, :dependent => :destroy, :order => [:n, :asc])
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index({:filename => 1}, :unique => true)
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def path
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filename
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end
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def basename
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::File.basename(filename)
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end
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def prefix
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self.class.namespace.prefix
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end
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def each(&block)
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chunks.all.order_by([:n, :asc]).each do |chunk|
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block.call(chunk.to_s)
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end
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end
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def data
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data = ''
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each{|chunk| data << chunk}
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data
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end
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def base64
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Array(to_s).pack('m')
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end
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def data_uri(options = {})
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data = base64.chomp
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"data:#{ content_type };base64,".concat(data)
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end
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def bytes(&block)
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if block
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each{|data| block.call(data)}
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length
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else
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bytes = []
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each{|data| bytes.push(*data)}
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bytes
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end
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end
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def close
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self
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end
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def content_type
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contentType
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end
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def update_date
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updateDate
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end
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def created_at
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updateDate
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end
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def namespace
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self.class.namespace
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end
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end
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end
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##
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#
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def GridFS.build_chunk_model_for(namespace)
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prefix = namespace.name.split(/::/).last.downcase
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file_model_name = "#{ namespace.name }::File"
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chunk_model_name = "#{ namespace.name }::Chunk"
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Class.new do
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include Mongoid::Document
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singleton_class = class << self; self; end
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singleton_class.instance_eval do
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define_method(:name){ chunk_model_name }
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attr_accessor :file_model
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attr_accessor :namespace
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end
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self.default_collection_name = "#{ prefix }.chunks"
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field(:n, :type => Integer, :default => 0)
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field(:data, :type => (defined?(Moped) ? Moped::BSON::Binary : BSON::Binary))
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belongs_to(:file, :foreign_key => :files_id, :class_name => file_model_name)
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index({:files_id => 1, :n => -1}, :unique => true)
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def namespace
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self.class.namespace
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end
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def to_s
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data.data
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end
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alias_method 'to_str', 'to_s'
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end
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end
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##
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#
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def GridFS.reading(arg, &block)
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if arg.respond_to?(:read)
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rewind(arg) do |io|
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block.call(io)
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end
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else
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open(arg.to_s) do |io|
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block.call(io)
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end
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end
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end
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def GridFS.rewind(io, &block)
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begin
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pos = io.pos
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io.flush
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io.rewind
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rescue
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nil
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end
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begin
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block.call(io)
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ensure
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begin
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io.pos = pos
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rescue
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nil
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end
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end
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end
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def GridFS.extract_basename(object)
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filename = nil
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[:original_path, :original_filename, :path, :filename, :pathname].each do |msg|
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if object.respond_to?(msg)
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filename = object.send(msg)
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break
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end
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end
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filename ? cleanname(filename) : nil
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end
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def GridFS.extract_content_type(filename)
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content_type = MIME::Types.type_for(::File.basename(filename.to_s)).first
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content_type.to_s if content_type
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end
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def GridFS.cleanname(pathname)
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basename = ::File.basename(pathname.to_s)
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CGI.unescape(basename).gsub(%r/[^0-9a-zA-Z_@)(~.-]/, '_').gsub(%r/_+/,'_')
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end
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end
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##
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#
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GridFs = GridFS
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GridFS.init!
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