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database.rb
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database.rb
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module EM::Mongo
class Database
SYSTEM_NAMESPACE_COLLECTION = "system.namespaces"
SYSTEM_INDEX_COLLECTION = "system.indexes"
SYSTEM_PROFILE_COLLECTION = "system.profile"
SYSTEM_USER_COLLECTION = "system.users"
SYSTEM_JS_COLLECTION = "system.js"
SYSTEM_COMMAND_COLLECTION = "$cmd"
def initialize(name = DEFAULT_DB, connection = nil)
@db_name = name
@em_connection = connection || EM::Mongo::Connection.new
@collection = nil
@collections = {}
end
def collection(name = EM::Mongo::DEFAULT_NS)
@collections[name] ||= EM::Mongo::Collection.new(@db_name, name, @em_connection)
end
def connection
@em_connection
end
def close
@em_connection.close
end
def name
@db_name
end
# Get an array of collection names in this database.
#
# @return [Array]
def collection_names
response = EM::DefaultDeferrable.new
name_resp = collections_info.to_a
name_resp.callback do |docs|
names = docs.collect{ |doc| doc['name'] || '' }
names = names.delete_if {|name| name.index(self.name).nil? || name.index('$')}
names = names.map{ |name| name.sub(self.name + '.','')}
response.succeed(names)
end
name_resp.errback { |err| response.fail err }
response
end
# Get an array of Collection instances, one for each collection in this database.
#
# @return [Array<Mongo::Collection>]
def collections
response = EM::DefaultDeferrable.new
name_resp = collection_names
name_resp.callback do |names|
response.succeed names.map do |name|
EM::Mongo::Collection.new(@db_name, name, @em_connection)
end
end
name_resp.errback { |err| response.fail err }
response
end
# Get info on system namespaces (collections). This method returns
# a cursor which can be iterated over. For each collection, a hash
# will be yielded containing a 'name' string and, optionally, an 'options' hash.
#
# @param [String] coll_name return info for the specifed collection only.
#
# @return [Mongo::Cursor]
def collections_info(coll_name=nil)
selector = {}
selector[:name] = full_collection_name(coll_name) if coll_name
Cursor.new(EM::Mongo::Collection.new(@db_name, SYSTEM_NAMESPACE_COLLECTION, @em_connection), :selector => selector)
end
# Create a collection.
#
# new collection. If +strict+ is true, will raise an error if
# collection +name+ already exists.
#
# @param [String, Symbol] name the name of the new collection.
#
# @option opts [Boolean] :capped (False) created a capped collection.
#
# @option opts [Integer] :size (Nil) If +capped+ is +true+,
# specifies the maximum number of bytes for the capped collection.
# If +false+, specifies the number of bytes allocated
# for the initial extent of the collection.
#
# @option opts [Integer] :max (Nil) If +capped+ is +true+, indicates
# the maximum number of records in a capped collection.
#
# @raise [MongoDBError] raised under two conditions:
# either we're in +strict+ mode and the collection
# already exists or collection creation fails on the server.
#
# @return [Mongo::Collection]
def create_collection(name)
response = EM::DefaultDeferrable.new
names_resp = collection_names
names_resp.callback do |names|
if names.include?(name.to_s)
response.succeed EM::Mongo::Collection.new(@db_name, name, @em_connection)
end
# Create a new collection.
oh = BSON::OrderedHash.new
oh[:create] = name
cmd_resp = command(oh)
cmd_resp.callback do |doc|
if EM::Mongo::Support.ok?(doc)
response.succeed EM::Mongo::Collection.new(@db_name, name, @em_connection)
else
response.fail [MongoDBError, "Error creating collection: #{doc.inspect}"]
end
end
cmd_resp.errback { |err| response.fail err }
end
names_resp.errback { |err| response.fail err }
response
end
# Drop a collection by +name+.
#
# @param [String, Symbol] name
#
# @return [Boolean] +true+ on success or +false+ if the collection name doesn't exist.
def drop_collection(name)
response = EM::DefaultDeferrable.new
names_resp = collection_names
names_resp.callback do |names|
if names.include?(name.to_s)
cmd_resp = command(:drop=>name)
cmd_resp.callback do |doc|
response.succeed EM::Mongo::Support.ok?(doc)
end
cmd_resp.errback { |err| response.fail err }
else
response.succeed true
end
end
names_resp.errback { |err| response.fail err }
response
end
# Run the getlasterror command with the specified replication options.
#
# @option opts [Boolean] :fsync (false)
# @option opts [Integer] :w (nil)
# @option opts [Integer] :wtimeout (nil)
#
# @return [Hash] the entire response to getlasterror.
#
# @raise [MongoDBError] if the operation fails.
def get_last_error(opts={})
response = EM::DefaultDeferrable.new
cmd = BSON::OrderedHash.new
cmd[:getlasterror] = 1
cmd.merge!(opts)
cmd_resp = command(cmd, :check_response => false)
cmd_resp.callback do |doc|
if EM::Mongo::Support.ok?(doc)
response.succeed doc
else
response.fail [MongoDBError, "error retrieving last error: #{doc.inspect}"]
end
end
cmd_resp.errback { |err| response.fail err }
response
end
# Return +true+ if an error was caused by the most recently executed
# database operation.
#
# @return [Boolean]
def error?
response = EM::DefaultDeferrable.new
err_resp = get_last_error
err_resp.callback do |doc|
response.succeed doc['err'] != nil
end
err_resp.errback do |err|
response.fail err
end
response
end
# Reset the error history of this database
#
# Calls to DB#previous_error will only return errors that have occurred
# since the most recent call to this method.
#
# @return [Hash]
def reset_error_history
command(:reseterror => 1)
end
# A shortcut returning db plus dot plus collection name.
#
# @param [String] collection_name
#
# @return [String]
def full_collection_name(collection_name)
"#{name}.#{collection_name}"
end
# Send a command to the database.
#
# Note: DB commands must start with the "command" key. For this reason,
# any selector containing more than one key must be an OrderedHash.
#
# Note also that a command in MongoDB is just a kind of query
# that occurs on the system command collection ($cmd). Examine this method's implementation
# to see how it works.
#
# @param [OrderedHash, Hash] selector an OrderedHash, or a standard Hash with just one
# key, specifying the command to be performed. In Ruby 1.9, OrderedHash isn't necessary since
# hashes are ordered by default.
#
# @option opts [Boolean] :check_response (true) If +true+, raises an exception if the
# command fails.
# @option opts [Socket] :socket a socket to use for sending the command. This is mainly for internal use.
#
# @return [EM::Deferrable]
#
# @core commands command_instance-method
def command(selector, opts={})
check_response = opts.fetch(:check_response, true)
raise MongoArgumentError, "command must be given a selector" unless selector.is_a?(Hash) && !selector.empty?
if selector.keys.length > 1 && RUBY_VERSION < '1.9' && selector.class != BSON::OrderedHash
raise MongoArgumentError, "DB#command requires an OrderedHash when hash contains multiple keys"
end
response = EM::DefaultDeferrable.new
cmd_resp = Cursor.new(self.collection(SYSTEM_COMMAND_COLLECTION), :limit => -1, :selector => selector).next_document
cmd_resp.callback do |doc|
if doc.nil?
response.fail([OperationFailure, "Database command '#{selector.keys.first}' failed: returned null."])
elsif (check_response && !EM::Mongo::Support.ok?(doc))
response.fail([OperationFailure, "Database command '#{selector.keys.first}' failed: #{doc.inspect}"])
else
response.succeed(doc)
end
end
cmd_resp.errback do |err|
response.fail([OperationFailure, "Database command '#{selector.keys.first}' failed: #{err[1]}"])
end
response
end
def authenticate(username, password)
response = EM::DefaultDeferrable.new
auth_resp = self.collection(SYSTEM_COMMAND_COLLECTION).first({'getnonce' => 1})
auth_resp.callback do |res|
if not res or not res['nonce']
response.succeed false
else
auth = BSON::OrderedHash.new
auth['authenticate'] = 1
auth['user'] = username
auth['nonce'] = res['nonce']
auth['key'] = EM::Mongo::Support.auth_key(username, password, res['nonce'])
auth_resp2 = self.collection(SYSTEM_COMMAND_COLLECTION).first(auth)
auth_resp2.callback do |res|
if EM::Mongo::Support.ok?(res)
response.succeed true
else
response.fail res
end
end
auth_resp2.errback { |err| response.fail err }
end
end
auth_resp.errback { |err| response.fail err }
response
end
def add_user(username, password)
response = EM::DefaultDeferrable.new
user_resp = self.collection(SYSTEM_USER_COLLECTION).first({:user => username})
user_resp.callback do |res|
user = res || {:user => username}
user['pwd'] = EM::Mongo::Support.hash_password(username, password)
response.succeed self.collection(SYSTEM_USER_COLLECTION).save(user)
end
user_resp.errback { |err| response.fail err }
response
end
end
end