525 lines
18 KiB
Ruby
525 lines
18 KiB
Ruby
# --
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# Copyright (C) 2008-2009 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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require 'socket'
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require 'timeout'
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require 'digest/md5'
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require 'thread'
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module Mongo
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# A MongoDB database.
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class DB
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SYSTEM_NAMESPACE_COLLECTION = "system.namespaces"
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SYSTEM_INDEX_COLLECTION = "system.indexes"
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SYSTEM_PROFILE_COLLECTION = "system.profile"
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SYSTEM_USER_COLLECTION = "system.users"
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SYSTEM_COMMAND_COLLECTION = "$cmd"
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# Counter for generating unique request ids.
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@@current_request_id = 0
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# Strict mode enforces collection existence checks. When +true+,
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# asking for a collection that does not exist, or trying to create a
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# collection that already exists, raises an error.
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#
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# Strict mode is disabled by default, but enabled (+true+) at any time.
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attr_writer :strict
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# Returns the value of the +strict+ flag.
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def strict?; @strict; end
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# The name of the database.
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attr_reader :name
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# The Mongo::Connection instance connecting to the MongoDB server.
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attr_reader :connection
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# An array of [host, port] pairs.
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attr_reader :nodes
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# The logger instance if :logger is passed to initialize.
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attr_reader :logger
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# Instances of DB are normally obtained by calling Mongo#db.
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#
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# @param [String] db_name the database name.
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# @param [Mongo::Connection] connection a connection object pointing to MongoDB. Note
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# that databases are usually instantiated via the Connection class. See the examples below.
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#
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# @option options [Boolean] strict (False) If true, collections must exist to be accessed and must
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# not exist to be created. See DB#collection and DB#create_collection.
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#
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# @option options [Object, #create_pk(doc)] pk (Mongo::ObjectID) A primary key factory object,
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# which should take a hash and return a hash which merges the original hash with any primary key
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# fields the factory wishes to inject. (NOTE: if the object already has a primary key,
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# the factory should not inject a new key).
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def initialize(db_name, connection, options={})
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@name = validate_db_name(db_name)
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@connection = connection
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@strict = options[:strict]
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@pk_factory = options[:pk]
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end
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# Authenticates with the given username and password. Note that mongod
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# must be started with the --auth option for authentication to be enabled.
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#
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# @param [String] username
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# @param [String] password
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#
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# @return [Boolean]
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def authenticate(username, password)
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doc = command(:getnonce => 1)
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raise "error retrieving nonce: #{doc}" unless ok?(doc)
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nonce = doc['nonce']
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auth = OrderedHash.new
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auth['authenticate'] = 1
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auth['user'] = username
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auth['nonce'] = nonce
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auth['key'] = Digest::MD5.hexdigest("#{nonce}#{username}#{hash_password(username, password)}")
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ok?(command(auth))
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end
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# Deauthorizes use for this database for this connection.
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#
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# @raise [MongoDBError] if logging out fails.
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#
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# @return [Boolean]
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def logout
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doc = command(:logout => 1)
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return true if ok?(doc)
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raise MongoDBError, "error logging out: #{doc.inspect}"
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end
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# Get an array of collection names in this database.
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#
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# @return [Array]
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def collection_names
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names = collections_info.collect { |doc| doc['name'] || '' }
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names = names.delete_if {|name| name.index(@name).nil? || name.index('$')}
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names.map {|name| name.sub(@name + '.', '')}
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end
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# Get an array of Collection instances, one for each collection in this database.
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#
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# @return [Array<Mongo::Collection>]
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def collections
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collection_names.map do |collection_name|
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Collection.new(self, collection_name)
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end
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end
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# Get info on system namespaces (collections). This method returns
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# a cursor which can be iterated over. For each collection, a hash
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# will be yielded containing a 'name' string and, optionally, an 'options' hash.
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#
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# @param [String] coll_name return info for the specifed collection only.
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#
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# @return [Mongo::Cursor<Hash>]
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def collections_info(coll_name=nil)
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selector = {}
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selector[:name] = full_collection_name(coll_name) if coll_name
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Cursor.new(Collection.new(self, SYSTEM_NAMESPACE_COLLECTION), :selector => selector)
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end
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# Create a collection.
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#
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# new collection. If +strict+ is true, will raise an error if
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# collection +name+ already exists.
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#
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# @param [String] name the name of the new collection.
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#
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# @option options [Boolean] :capped (False) created a capped collection.
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#
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# @option options [Integer] :size (Nil) If +capped+ is +true+, specifies the maximum number of
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# bytes for the capped collection. If +false+, specifies the number of bytes allocated
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# for the initial extent of the collection.
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#
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# @option options [Integer] :max (Nil) If +capped+ is +true+, indicates the maximum number of records
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# in a capped collection.
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#
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# @raise [MongoDBError] raised under two conditions: either we're in +strict+ mode and the collection
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# already exists or collection creation fails on the server.
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#
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# @return [Mongo::Collection]
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def create_collection(name, options={})
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# Does the collection already exist?
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if collection_names.include?(name)
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if strict?
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raise MongoDBError, "Collection #{name} already exists. Currently in strict mode."
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else
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return Collection.new(self, name)
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end
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end
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# Create a new collection.
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oh = OrderedHash.new
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oh[:create] = name
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doc = command(oh.merge(options || {}))
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ok = doc['ok']
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return Collection.new(self, name, @pk_factory) if ok.kind_of?(Numeric) && (ok.to_i == 1 || ok.to_i == 0)
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raise MongoDBError, "Error creating collection: #{doc.inspect}"
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end
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# @deprecated all the admin methods are now included in the DB class.
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def admin
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warn "DB#admin has been DEPRECATED. All the admin functions are now available in the DB class itself."
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Admin.new(self)
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end
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# Get a collection by name.
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#
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# @param [String] name the collection name.
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#
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# @raise [MongoDBError] if collection does not already exist and we're in +strict+ mode.
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def collection(name)
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return Collection.new(self, name, @pk_factory) if !strict? || collection_names.include?(name)
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raise MongoDBError, "Collection #{name} doesn't exist. Currently in strict mode."
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end
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alias_method :[], :collection
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# Drop a collection by +name+.
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#
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# @param [String] name
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#
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# @return [Boolean] True on success or if the collection names doesn't exist.
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def drop_collection(name)
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return true unless collection_names.include?(name)
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ok?(command(:drop => name))
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end
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# Get the error message from the most recently executed database
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# operation for this connection, or +nil+ if there was no error.
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#
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# @return [String, Nil]
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def error
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doc = command(:getlasterror => 1)
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raise MongoDBError, "error retrieving last error: #{doc}" unless ok?(doc)
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doc['err']
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end
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# Get status information from the last operation on this connection.
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#
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# @return [Hash] a hash representing the status of the last db op.
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def last_status
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command(:getlasterror => 1)
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end
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# Return +true+ if an error was caused by the most recently executed
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# database operation.
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#
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# @return [Boolean]
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def error?
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error != nil
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end
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# Get the most recent error to have occured on this database.
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#
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# This command only returns errors that have occured since the last call to
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# DB#reset_error_history - returns +nil+ if there is no such error.
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#
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# @return [String, Nil]
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def previous_error
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error = command(:getpreverror => 1)
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if error["err"]
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error
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else
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nil
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end
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end
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# Reset the error history of this database
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#
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# Calls to DB#previous_error will only return errors that have occurred
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# since the most recent call to this method.
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#
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# @return [Hash]
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def reset_error_history
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command(:reseterror => 1)
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end
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# @deprecated please use Collection#find to create queries.
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#
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# Returns a Cursor over the query results.
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#
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# Note that the query gets sent lazily; the cursor calls
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# Connection#send_message when needed. If the caller never requests an
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# object from the cursor, the query never gets sent.
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def query(collection, query, admin=false)
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Cursor.new(self, collection, query, admin)
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end
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# Dereference a DBRef, returning the document it points to.
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#
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# @param [Mongo::DBRef] dbref
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#
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# @return [Hash] the document indicated by the db reference.
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#
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# @see http://www.mongodb.org/display/DOCS/DB+Ref MongoDB DBRef spec.
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def dereference(dbref)
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collection(dbref.namespace).find_one("_id" => dbref.object_id)
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end
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# Evaluate a JavaScript expression in MongoDB.
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#
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# @param [String, Code] code a JavaScript expression to evaluate server-side.
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# @param [Integer, Hash] args any additional argument to be passed to the +code+ expression when
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# it's run on the server.
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def eval(code, *args)
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if not code.is_a? Code
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code = Code.new(code)
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end
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oh = OrderedHash.new
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oh[:$eval] = code
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oh[:args] = args
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doc = command(oh)
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return doc['retval'] if ok?(doc)
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raise OperationFailure, "eval failed: #{doc['errmsg']}"
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end
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# Rename a collection.
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#
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# @param [String] from original collection name.
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# @param [String] to new collection name.
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#
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# @return [True] returns +true+ on success.
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#
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# @raise MongoDBError if there's an error renaming the collection.
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def rename_collection(from, to)
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oh = OrderedHash.new
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oh[:renameCollection] = "#{@name}.#{from}"
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oh[:to] = "#{@name}.#{to}"
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doc = command(oh, true)
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ok?(doc) || raise(MongoDBError, "Error renaming collection: #{doc.inspect}")
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end
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# Drop an index from a given collection. Normally called from
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# Collection#drop_index or Collection#drop_indexes.
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#
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# @param [String] collection_name
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# @param [String] index_name
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#
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# @return [True] returns +true+ on success.
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#
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# @raise MongoDBError if there's an error renaming the collection.
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def drop_index(collection_name, index_name)
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oh = OrderedHash.new
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oh[:deleteIndexes] = collection_name
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oh[:index] = index_name
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doc = command(oh)
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ok?(doc) || raise(MongoDBError, "Error with drop_index command: #{doc.inspect}")
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end
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# Get information on the indexes for the given collection.
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# Normally called by Collection#index_information.
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#
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# @param [String] collection_name
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#
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# @return [Hash] keys are index names and the values are lists of [key, direction] pairs
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# defining the index.
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def index_information(collection_name)
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sel = {:ns => full_collection_name(collection_name)}
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info = {}
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Cursor.new(Collection.new(self, SYSTEM_INDEX_COLLECTION), :selector => sel).each { |index|
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info[index['name']] = index['key'].map {|k| k}
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}
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info
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end
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# Create a new index on the given collection.
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# Normally called by Collection#create_index.
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#
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# @param [String] collection_name
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# @param [String, Array] field_or_spec either either a single field name
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# or an array of [field name, direction] pairs. Directions should be specified as
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# Mongo::ASCENDING or Mongo::DESCENDING.
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# @param [Boolean] unique if +true+, the created index will enforce a uniqueness constraint.
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#
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# @return [String] the name of the index created.
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def create_index(collection_name, field_or_spec, unique=false)
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self.collection(collection_name).create_index(field_or_spec, unique)
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end
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# Return +true+ if the supplied +doc+ contains an 'ok' field with the value 1.
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#
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# @param [Hash] doc
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#
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# @return [Boolean]
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def ok?(doc)
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ok = doc['ok']
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ok.kind_of?(Numeric) && ok.to_i == 1
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end
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# Send a command to the database. Note that a command has a formal definition in MongoDB: it's
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# a kind of overloaded query.
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#
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# Note: DB commands must start with the "command" key. For this reason,
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# any selector containing more than one key must be an OrderedHash.
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#
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# @param [OrderedHash, Hash] selector an OrderedHash, or a standard Hash with just one
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# key, specifying the command to be performed.
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#
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# @param [Boolean] admin If +true+, the command will be executed on the admin
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# collection.
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#
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# @param [Boolean] check_response If +true+, will raise an exception if the
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# command fails.
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#
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# @param [Socket] sock a socket to use. This is mainly for internal use.
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#
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# @return [Hash]
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def command(selector, admin=false, check_response=false, sock=nil)
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raise MongoArgumentError, "command must be given a selector" unless selector.is_a?(Hash) && !selector.empty?
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if selector.class.eql?(Hash) && selector.keys.length > 1
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raise MongoArgumentError, "DB#command requires an OrderedHash when hash contains multiple keys"
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end
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result = Cursor.new(system_command_collection, :admin => admin,
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:limit => -1, :selector => selector, :socket => sock).next_document
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if check_response && !ok?(result)
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raise OperationFailure, "Database command '#{selector.keys.first}' failed."
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else
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result
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end
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end
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# @deprecated please use DB#command instead.
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def db_command(*args)
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warn "DB#db_command has been DEPRECATED. Please use DB#command instead."
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command(args[0], args[1])
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end
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# A shortcut returning db plus dot plus collection name.
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#
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# @param [String] collection_name
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#
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# @return [String]
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def full_collection_name(collection_name)
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"#{@name}.#{collection_name}"
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end
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# The primary key factory object (or +nil+).
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#
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# @return [Object, Nil]
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def pk_factory
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@pk_factory
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end
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# Specify a primary key factory if not already set.
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#
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# @raise [MongoArgumentError] if the primary key factory has already been set.
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def pk_factory=(pk_factory)
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if @pk_factory
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raise MongoArgumentError, "Cannot change primary key factory once it's been set"
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end
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@pk_factory = pk_factory
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end
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# Return the current database profiling level.
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#
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# @return [Symbol] :off, :slow_only, or :all
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def profiling_level
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oh = OrderedHash.new
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oh[:profile] = -1
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doc = command(oh)
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raise "Error with profile command: #{doc.inspect}" unless ok?(doc) && doc['was'].kind_of?(Numeric)
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case doc['was'].to_i
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when 0
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:off
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when 1
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:slow_only
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when 2
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:all
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else
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raise "Error: illegal profiling level value #{doc['was']}"
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end
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end
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# Set this database's profiling level.
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#
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# @param [Symbol] level acceptable options are +:off+, +:slow_only+, or +:all+.
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def profiling_level=(level)
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oh = OrderedHash.new
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oh[:profile] = case level
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when :off
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0
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when :slow_only
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1
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when :all
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2
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else
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raise "Error: illegal profiling level value #{level}"
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end
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doc = command(oh)
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ok?(doc) || raise(MongoDBError, "Error with profile command: #{doc.inspect}")
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end
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# Get the current profiling information.
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#
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# @return [Array] a list of documents containing profiling information.
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def profiling_info
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Cursor.new(Collection.new(self, DB::SYSTEM_PROFILE_COLLECTION), :selector => {}).to_a
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end
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# Validate a named collection.
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#
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# @param [String] name the collection name.
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#
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# @return [Hash] validation information.
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#
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# @raise [MongoDBError] if the command fails or there's a problem with the validation
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# data, or if the collection is invalid.
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def validate_collection(name)
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doc = command(:validate => name)
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raise MongoDBError, "Error with validate command: #{doc.inspect}" unless ok?(doc)
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result = doc['result']
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raise MongoDBError, "Error with validation data: #{doc.inspect}" unless result.kind_of?(String)
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raise MongoDBError, "Error: invalid collection #{name}: #{doc.inspect}" if result =~ /\b(exception|corrupt)\b/i
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doc
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end
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private
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def hash_password(username, plaintext)
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Digest::MD5.hexdigest("#{username}:mongo:#{plaintext}")
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end
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def system_command_collection
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Collection.new(self, SYSTEM_COMMAND_COLLECTION)
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end
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def validate_db_name(db_name)
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unless [String, Symbol].include?(db_name.class)
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raise TypeError, "db_name must be a string or symbol"
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end
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[" ", ".", "$", "/", "\\"].each do |invalid_char|
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if db_name.include? invalid_char
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raise InvalidName, "database names cannot contain the character '#{invalid_char}'"
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end
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end
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raise InvalidName, "database name cannot be the empty string" if db_name.empty?
|
|
db_name
|
|
end
|
|
end
|
|
end
|