80 lines
2.2 KiB
Ruby
80 lines
2.2 KiB
Ruby
# --
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# Copyright (C) 2008-2010 10gen Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ++
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module Mongo
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# Implementation of the MongoDB GridFS specification. A file store.
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class Grid
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DEFAULT_FS_NAME = 'fs'
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# Initialize a new Grid instance, consisting of a MongoDB database
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# and a filesystem prefix if not using the default.
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#
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# @core gridfs
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# @see GridFileSystem
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def initialize(db, fs_name=DEFAULT_FS_NAME)
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raise MongoArgumentError, "db must be a Mongo::DB." unless db.is_a?(Mongo::DB)
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@db = db
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@files = @db["#{fs_name}.files"]
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@chunks = @db["#{fs_name}.chunks"]
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@fs_name = fs_name
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@chunks.create_index([['files_id', Mongo::ASCENDING], ['n', Mongo::ASCENDING]])
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end
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# Store a file in the file store.
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#
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# @param [String, #read] data a string or io-like object to store.
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# @param [String] filename a name for the file.
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#
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# @return [Mongo::ObjectID] the file's id.
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def put(data, filename, opts={})
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opts.merge!(default_grid_io_opts)
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file = GridIO.new(@files, @chunks, filename, 'w', opts=opts)
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file.write(data)
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file.close
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file.files_id
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end
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# Read a file from the file store.
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#
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# @param [] id the file's unique id.
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#
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# @return [Mongo::GridIO]
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def get(id)
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opts = {:query => {'_id' => id}}.merge!(default_grid_io_opts)
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GridIO.new(@files, @chunks, nil, 'r', opts)
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end
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# Delete a file from the store.
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#
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# @param [] id
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#
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# @return [Boolean]
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def delete(id)
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@files.remove({"_id" => id})
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@chunks.remove({"_id" => id})
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end
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private
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def default_grid_io_opts
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{:fs_name => @fs_name}
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end
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end
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end
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