671 lines
22 KiB
Ruby
671 lines
22 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 'digest/md5'
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require 'thread'
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require 'mongo/collection'
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require 'mongo/util/ordered_hash.rb'
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require 'mongo/admin'
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module Mongo
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# A Mongo database.
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class DB
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STANDARD_HEADER_SIZE = 16
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RESPONSE_HEADER_SIZE = 20
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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 off (+false+) by default. Its value can be changed at
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# 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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attr_reader :connection
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# Host to which we are currently connected.
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attr_reader :host
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# Port to which we are currently connected.
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attr_reader :port
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# An array of [host, port] pairs.
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attr_reader :nodes
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# The database's socket. For internal (and Cursor) use only.
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attr_reader :socket
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# The logger instance if :logger is passed to initialize
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attr_reader :logger
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def slave_ok?; @slave_ok; end
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def auto_reconnect?; @auto_reconnect; end
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# A primary key factory object (or +nil+). See the README.doc file or
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# DB#new for details.
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attr_reader :pk_factory
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def pk_factory=(pk_factory)
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raise "error: can not change PK factory" if @pk_factory
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@pk_factory = pk_factory
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end
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# Instances of DB are normally obtained by calling Mongo#db.
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#
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# db_name :: The database name
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#
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# nodes :: An array of [host, port] pairs. See Connection#new, which offers
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# a more flexible way of defining nodes.
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#
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# options :: A hash of options.
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#
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# Options:
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#
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# :strict :: If true, collections must exist to be accessed and must
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# not exist to be created. See #collection and
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# #create_collection.
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#
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# :pk :: A primary key factory object that must respond to :create_pk,
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# which should take a hash and return a hash which merges the
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# original hash with any primary key fields the factory wishes
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# to inject. (NOTE: if the object already has a primary key,
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# the factory should not inject a new key; this means that the
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# object is being used in a repsert but it already exists.) The
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# idea here is that when ever a record is inserted, the :pk
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# object's +create_pk+ method will be called and the new hash
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# returned will be inserted.
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#
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# :slave_ok :: Only used if +nodes+ contains only one host/port. If
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# false, when connecting to that host/port we check to
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# see if the server is the master. If it is not, an error
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# is thrown.
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#
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# :auto_reconnect :: If the connection gets closed (for example, we
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# have a server pair and saw the "not master"
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# error, which closes the connection), then
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# automatically try to reconnect to the master or
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# to the single server we have been given. Defaults
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# to +false+.
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# :logger :: Optional Logger instance to which driver usage information
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# will be logged.
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#
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# When a DB object first connects to a pair, it will find the master
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# instance and connect to that one. On socket error or if we recieve a
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# "not master" error, we again find the master of the pair.
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def initialize(db_name, nodes, options={})
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case db_name
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when Symbol, String
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else
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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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if db_name.empty?
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raise InvalidName, "database name cannot be the empty string"
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end
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@connection = options[:connection]
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@name, @nodes = db_name, nodes
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@strict = options[:strict]
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@pk_factory = options[:pk]
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@slave_ok = options[:slave_ok] && @nodes.length == 1 # only OK if one node
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@auto_reconnect = options[:auto_reconnect]
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@semaphore = Mutex.new
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@socket = nil
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@logger = options[:logger]
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connect_to_master
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end
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def connect_to_master
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close if @socket
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@host = @port = nil
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@nodes.detect { |hp|
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@host, @port = *hp
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begin
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@socket = TCPSocket.new(@host, @port)
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@socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
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# Check for master. Can't call master? because it uses mutex,
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# which may already be in use during this call.
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semaphore_is_locked = @semaphore.locked?
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@semaphore.unlock if semaphore_is_locked
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is_master = master?
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@semaphore.lock if semaphore_is_locked
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if !@slave_ok && !is_master
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raise ConfigurationError, "Trying to connect directly to slave; if this is what you want, specify :slave_ok => true."
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end
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@slave_ok || is_master
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rescue SocketError, SystemCallError, IOError => ex
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close if @socket
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false
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end
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}
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raise "error: failed to connect to any given host:port" unless @socket
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end
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# Returns true if +username+ has +password+ in
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# +SYSTEM_USER_COLLECTION+. +name+ is username, +password+ is
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# plaintext password.
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def authenticate(username, password)
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doc = db_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?(db_command(auth))
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end
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# Deauthorizes use for this database for this connection.
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def logout
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doc = db_command(:logout => 1)
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raise "error logging out: #{doc.inspect}" unless ok?(doc)
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end
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# Returns an array of collection names in this database.
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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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# Retruns an array of Collection instances, one for each collection in this
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# database.
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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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# Returns a cursor over query result hashes. Each hash contains a
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# 'name' string and optionally an 'options' hash. If +coll_name+ is
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# specified, an array of length 1 is returned.
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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. If +strict+ is false, will return existing or
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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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# Options is an optional hash:
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#
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# :capped :: Boolean. If not specified, capped is +false+.
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#
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# :size :: If +capped+ is +true+, specifies the maximum number of
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# bytes. If +false+, specifies the initial extent of the
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# collection.
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#
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# :max :: Max number of records in a capped collection. Optional.
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def create_collection(name, options={})
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# First check existence
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if collection_names.include?(name)
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if strict?
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raise "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 new collection
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oh = OrderedHash.new
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oh[:create] = name
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doc = db_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 "Error creating collection: #{doc.inspect}"
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end
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def admin
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Admin.new(self)
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end
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# Return a collection. If +strict+ is false, will return existing or
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# new collection. If +strict+ is true, will raise an error if
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# collection +name+ does not already exists.
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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 "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 collection +name+. Returns +true+ on success or if the
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# collection does not exist, +false+ otherwise.
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def drop_collection(name)
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return true unless collection_names.include?(name)
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ok?(db_command(:drop => name))
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end
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# Returns 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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def error
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doc = db_command(:getlasterror => 1)
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raise "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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def last_status
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db_command(:getlasterror => 1)
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end
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# Returns +true+ if an error was caused by the most recently executed
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# database operation.
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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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# 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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def previous_error
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error = db_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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def reset_error_history
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db_command(:reseterror => 1)
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end
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# Returns true if this database is a master (or is not paired with any
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# other database), false if it is a slave.
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def master?
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doc = db_command(:ismaster => 1)
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is_master = doc['ismaster']
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ok?(doc) && is_master.kind_of?(Numeric) && is_master.to_i == 1
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end
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# Returns a string of the form "host:port" that points to the master
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# database. Works even if this is the master database.
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def master
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doc = db_command(:ismaster => 1)
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is_master = doc['ismaster']
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raise "Error retrieving master database: #{doc.inspect}" unless ok?(doc) && is_master.kind_of?(Numeric)
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case is_master.to_i
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when 1
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"#@host:#@port"
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else
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doc['remote']
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end
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end
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# Close the connection to the database.
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def close
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if @socket
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s = @socket
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@socket = nil
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s.close
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end
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end
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def connected?
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@socket != nil
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end
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def receive_full(length)
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message = ""
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while message.length < length do
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chunk = @socket.recv(length - message.length)
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raise "connection closed" unless chunk.length > 0
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message += chunk
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end
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message
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end
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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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# #send_query_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, getting the document it points to.
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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 on MongoDB.
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# +code+ should be a string or Code instance containing a JavaScript
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# expression. Additional arguments will be passed to that expression
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# when it is 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 = db_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 collection +from+ to +to+. Meant to be called by
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# Collection#rename.
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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 = db_command(oh, true)
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raise "Error renaming collection: #{doc.inspect}" unless ok?(doc)
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end
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# Drop index +name+ from +collection_name+. Normally called from
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# Collection#drop_index or Collection#drop_indexes.
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def drop_index(collection_name, name)
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oh = OrderedHash.new
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oh[:deleteIndexes] = collection_name
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oh[:index] = name
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doc = db_command(oh)
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raise "Error with drop_index command: #{doc.inspect}" unless ok?(doc)
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end
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# Get information on the indexes for the collection +collection_name+.
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# Normally called by Collection#index_information. Returns a hash where
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# the keys are index names (as returned by Collection#create_index and
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# the values are lists of [key, direction] pairs specifying the index
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# (as passed to Collection#create_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'].to_a
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}
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info
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end
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# Create a new index on +collection_name+. +field_or_spec+
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# should be either a single field name or a Array of [field name,
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# direction] pairs. Directions should be specified as
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# Mongo::ASCENDING or Mongo::DESCENDING. Normally called
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# by Collection#create_index. If +unique+ is true the index will
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# enforce a uniqueness constraint.
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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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# Sends a message to MongoDB.
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#
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# Takes a MongoDB opcode, +operation+, a message of class ByteBuffer,
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# +message+, and an optional formatted +log_message+.
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# Sends the message to the databse, adding the necessary headers.
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def send_message_with_operation(operation, message, log_message=nil)
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message_with_headers = add_message_headers(operation, message).to_s
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@logger.debug(" MONGODB #{log_message || message}") if @logger
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@semaphore.synchronize do
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send_message_on_socket(message_with_headers)
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end
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end
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# Sends a message to the database, waits for a response, and raises
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# and exception if the operation has failed.
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def send_message_with_safe_check(operation, message, log_message=nil)
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message_with_headers = add_message_headers(operation, message)
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message_with_check = last_error_message
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@logger.debug(" MONGODB #{log_message || message}") if @logger
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@semaphore.synchronize do
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send_message_on_socket(message_with_headers.append!(message_with_check).to_s)
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docs, num_received, cursor_id = receive
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if num_received == 1 && error = docs[0]['err']
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raise Mongo::OperationFailure, error
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end
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end
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end
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# Note: this method is a stub. Will be completed in an upcoming refactoring.
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def receive_message_with_operation(operation, message, log_message=nil)
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message_with_headers = add_message_headers(operation, message).to_s
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@logger.debug(" MONGODB #{log_message || message}") if @logger
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@semaphore.synchronize do
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send_message_on_socket(message_with_headers)
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receive
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end
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end
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def receive
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receive_header
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number_received, cursor_id = receive_response_header
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read_documents(number_received, cursor_id)
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end
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def receive_header
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header = ByteBuffer.new
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header.put_array(receive_data_on_socket(16).unpack("C*"))
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unless header.size == STANDARD_HEADER_SIZE
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raise "Short read for DB response header: " +
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"expected #{STANDARD_HEADER_SIZE} bytes, saw #{header.size}"
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end
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header.rewind
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size = header.get_int
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request_id = header.get_int
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response_to = header.get_int
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op = header.get_int
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end
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def receive_response_header
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header_buf = ByteBuffer.new
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header_buf.put_array(receive_data_on_socket(RESPONSE_HEADER_SIZE).unpack("C*"))
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if header_buf.length != RESPONSE_HEADER_SIZE
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raise "Short read for DB response header; " +
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"expected #{RESPONSE_HEADER_SIZE} bytes, saw #{header_buf.length}"
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end
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header_buf.rewind
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result_flags = header_buf.get_int
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cursor_id = header_buf.get_long
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starting_from = header_buf.get_int
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number_remaining = header_buf.get_int
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[number_remaining, cursor_id]
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end
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|
def read_documents(number_received, cursor_id)
|
|
docs = []
|
|
number_remaining = number_received
|
|
while number_remaining > 0 do
|
|
buf = ByteBuffer.new
|
|
buf.put_array(receive_data_on_socket(4).unpack("C*"))
|
|
buf.rewind
|
|
size = buf.get_int
|
|
buf.put_array(receive_data_on_socket(size - 4).unpack("C*"), 4)
|
|
number_remaining -= 1
|
|
buf.rewind
|
|
docs << BSON.new.deserialize(buf)
|
|
end
|
|
[docs, number_received, cursor_id]
|
|
end
|
|
|
|
# Sending a message on socket.
|
|
def send_message_on_socket(packed_message)
|
|
connect_to_master if !connected? && @auto_reconnect
|
|
begin
|
|
@socket.print(packed_message)
|
|
@socket.flush
|
|
rescue => ex
|
|
close
|
|
raise ex
|
|
end
|
|
end
|
|
|
|
# Receive data of specified length on socket.
|
|
def receive_data_on_socket(length)
|
|
message = ""
|
|
while message.length < length do
|
|
chunk = @socket.recv(length - message.length)
|
|
raise "connection closed" unless chunk.length > 0
|
|
message += chunk
|
|
end
|
|
message
|
|
end
|
|
|
|
# Return +true+ if +doc+ contains an 'ok' field with the value 1.
|
|
def ok?(doc)
|
|
ok = doc['ok']
|
|
ok.kind_of?(Numeric) && ok.to_i == 1
|
|
end
|
|
|
|
# DB commands need to be ordered, so selector must be an OrderedHash
|
|
# (or a Hash with only one element). What DB commands really need is
|
|
# that the "command" key be first.
|
|
def db_command(selector, use_admin_db=false)
|
|
if !selector.kind_of?(OrderedHash)
|
|
if !selector.kind_of?(Hash) || selector.keys.length > 1
|
|
raise "db_command must be given an OrderedHash when there is more than one key"
|
|
end
|
|
end
|
|
|
|
cursor = Cursor.new(Collection.new(self, SYSTEM_COMMAND_COLLECTION), :admin => use_admin_db, :limit => -1, :selector => selector)
|
|
cursor.next_object
|
|
end
|
|
|
|
# Sends a command to the database.
|
|
#
|
|
# :selector (required) :: An OrderedHash, or a standard Hash with just one
|
|
# key, specifying the command to be performed.
|
|
#
|
|
# :admin (optional) :: If true, the command will be executed on the admin
|
|
# collection.
|
|
#
|
|
# :check_response (optional) :: If true, will raise an exception if the
|
|
# command fails.
|
|
#
|
|
# Note: DB commands must start with the "command" key. For this reason,
|
|
# any selector containing more than one key must be an OrderedHash.
|
|
def command(selector, admin=false, check_response=false)
|
|
raise MongoArgumentError, "command must be given a selector" unless selector.is_a?(Hash) && !selector.empty?
|
|
if selector.class.eql?(Hash) && selector.keys.length > 1
|
|
raise MongoArgumentError, "DB#command requires an OrderedHash when hash contains multiple keys"
|
|
end
|
|
|
|
result = Cursor.new(system_command_collection, :admin => admin,
|
|
:limit => -1, :selector => selector).next_object
|
|
|
|
if check_response && !ok?(result)
|
|
raise OperationFailure, "Database command '#{selector.keys.first}' failed."
|
|
else
|
|
result
|
|
end
|
|
end
|
|
|
|
def full_collection_name(collection_name)
|
|
"#{@name}.#{collection_name}"
|
|
end
|
|
|
|
private
|
|
|
|
# Prepares a message for transmission to MongoDB by
|
|
# constructing a valid message header.
|
|
def add_message_headers(operation, message)
|
|
headers = ByteBuffer.new
|
|
|
|
# Message size.
|
|
headers.put_int(16 + message.size)
|
|
|
|
# Unique request id.
|
|
headers.put_int(get_request_id)
|
|
|
|
# Response id.
|
|
headers.put_int(0)
|
|
|
|
# Opcode.
|
|
headers.put_int(operation)
|
|
message.prepend!(headers)
|
|
end
|
|
|
|
# Increments and then returns the next available request id.
|
|
# Note: this method should be called from within a lock.
|
|
def get_request_id
|
|
@@current_request_id += 1
|
|
@@current_request_id
|
|
end
|
|
|
|
# Creates a getlasterror message.
|
|
def last_error_message
|
|
generate_last_error_message
|
|
end
|
|
|
|
def generate_last_error_message
|
|
message = ByteBuffer.new
|
|
message.put_int(0)
|
|
BSON.serialize_cstr(message, "#{@name}.$cmd")
|
|
message.put_int(0)
|
|
message.put_int(-1)
|
|
message.put_array(BSON.new.serialize({:getlasterror => 1}).to_a)
|
|
add_message_headers(Mongo::Constants::OP_QUERY, message)
|
|
end
|
|
|
|
def reset_error_message
|
|
@@reset_error_message ||= generate_reset_error_message
|
|
end
|
|
|
|
def generate_reset_error_message
|
|
message = ByteBuffer.new
|
|
message.put_int(0)
|
|
BSON.serialize_cstr(message, "#{@name}.$cmd")
|
|
message.put_int(0)
|
|
message.put_int(-1)
|
|
message.put_array(BSON.new.serialize({:reseterror => 1}).to_a)
|
|
add_message_headers(Mongo::Constants::OP_QUERY, message)
|
|
end
|
|
|
|
def hash_password(username, plaintext)
|
|
Digest::MD5.hexdigest("#{username}:mongo:#{plaintext}")
|
|
end
|
|
|
|
def system_command_collection
|
|
Collection.new(self, SYSTEM_COMMAND_COLLECTION)
|
|
end
|
|
end
|
|
end
|