561 lines
17 KiB
Ruby
561 lines
17 KiB
Ruby
# encoding: UTF-8
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# --
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# Copyright (C) 2008-2011 10gen Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ++
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module Mongo
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# Instantiates and manages connections to a MongoDB replica set.
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class ReplSetConnection < Connection
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REPL_SET_OPTS = [:read, :refresh_mode, :refresh_interval, :require_primary,
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:read_secondary, :rs_name, :name]
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attr_reader :replica_set_name, :seeds, :refresh_interval, :refresh_mode,
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:refresh_version
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# Create a connection to a MongoDB replica set.
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#
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# Once connected to a replica set, you can find out which nodes are primary, secondary, and
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# arbiters with the corresponding accessors: Connection#primary, Connection#secondaries, and
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# Connection#arbiters. This is useful if your application needs to connect manually to nodes other
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# than the primary.
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#
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# @param [Array] seeds "host:port" strings
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#
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# @option opts [String] :name (nil) The name of the replica set to connect to. You
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# can use this option to verify that you're connecting to the right replica set.
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# @option opts [Boolean, Hash] :safe (false) Set the default safe-mode options
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# propogated to DB objects instantiated off of this Connection. This
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# default can be overridden upon instantiation of any DB by explicity setting a :safe value
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# on initialization.
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# @option opts [:primary, :secondary] :read (:primary) The default read preference for Mongo::DB
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# objects created from this connection object. If +:secondary+ is chosen, reads will be sent
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# to one of the closest available secondary nodes. If a secondary node cannot be located, the
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# read will be sent to the primary.
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# @option opts [Logger] :logger (nil) Logger instance to receive driver operation log.
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# @option opts [Integer] :pool_size (1) The maximum number of socket connections allowed per
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# connection pool. Note: this setting is relevant only for multi-threaded applications.
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# @option opts [Float] :pool_timeout (5.0) When all of the connections a pool are checked out,
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# this is the number of seconds to wait for a new connection to be released before throwing an exception.
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# Note: this setting is relevant only for multi-threaded applications.
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# @option opts [Float] :op_timeout (nil) The number of seconds to wait for a read operation to time out.
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# @option opts [Float] :connect_timeout (30) The number of seconds to wait before timing out a
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# connection attempt.
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# @option opts [Boolean] :ssl (false) If true, create the connection to the server using SSL.
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# @option opts [Boolean] :refresh_mode (false) Set this to :sync to periodically update the
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# state of the connection every :refresh_interval seconds. Replica set connection failures
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# will always trigger a complete refresh. This option is useful when you want to add new nodes
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# or remove replica set nodes not currently in use by the driver.
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# @option opts [Integer] :refresh_interval (90) If :refresh_mode is enabled, this is the number of seconds
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# between calls to check the replica set's state.
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# @option opts [Boolean] :require_primary (true) If true, require a primary node for the connection
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# to succeed. Otherwise, connection will succeed as long as there's at least one secondary node.
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# Note: that the number of seed nodes does not have to be equal to the number of replica set members.
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# The purpose of seed nodes is to permit the driver to find at least one replica set member even if a member is down.
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#
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# @example Connect to a replica set and provide two seed nodes.
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# ReplSetConnection.new(['localhost:30000', 'localhost:30001'])
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#
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# @example Connect to a replica set providing two seed nodes and ensuring a connection to the replica set named 'prod':
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# ReplSetConnection.new(['localhost:30000', 'localhost:30001'], :name => 'prod')
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#
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# @example Connect to a replica set providing two seed nodes and allowing reads from a secondary node:
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# ReplSetConnection.new(['localhost:30000', 'localhost:30001'], :read => :secondary)
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#
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# @see http://api.mongodb.org/ruby/current/file.REPLICA_SETS.html Replica sets in Ruby
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#
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# @raise [ReplicaSetConnectionError] This is raised if a replica set name is specified and the
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# driver fails to connect to a replica set with that name.
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def initialize(*args)
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if args.last.is_a?(Hash)
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opts = args.pop
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else
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opts = {}
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end
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unless args.length > 0
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raise MongoArgumentError, "A ReplSetConnection requires at least one seed node."
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end
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# This is temporary until support for the old format is dropped
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@seeds = []
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if args.first.last.is_a?(Integer)
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warn "Initiating a ReplSetConnection with seeds passed as individual [host, port] array arguments is deprecated."
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warn "Please specify hosts as an array of 'host:port' strings; the old format will be removed in v2.0"
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@seeds = args
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else
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args.first.map do |host_port|
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seed = host_port.split(":")
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seed[1] = seed[1].to_i
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seeds << seed
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end
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end
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# TODO: add a method for replacing this list of node.
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@seeds.freeze
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# Refresh
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@last_refresh = Time.now
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@refresh_version = 0
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# No connection manager by default.
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@manager = nil
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@old_managers = []
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# Lock for request ids.
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@id_lock = Mutex.new
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@pool_mutex = Mutex.new
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@connected = false
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@safe_mutex_lock = Mutex.new
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@safe_mutexes = Hash.new {|hash, key| hash[key] = Mutex.new}
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@connect_mutex = Mutex.new
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@refresh_mutex = Mutex.new
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check_opts(opts)
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setup(opts)
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end
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def valid_opts
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GENERIC_OPTS + REPL_SET_OPTS
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end
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def inspect
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"<Mongo::ReplSetConnection:0x#{self.object_id.to_s(16)} @seeds=#{@seeds.inspect} " +
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"@connected=#{@connected}>"
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end
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# Initiate a connection to the replica set.
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def connect
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log(:info, "Connecting...")
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@connect_mutex.synchronize do
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return if @connected
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discovered_seeds = @manager ? @manager.seeds : []
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@manager = PoolManager.new(self, discovered_seeds)
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Thread.current[:manager] = @manager
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@manager.connect
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@refresh_version += 1
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if @require_primary && @manager.primary.nil? #TODO: in v2.0, we'll let this be optional and do a lazy connect.
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close
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raise ConnectionFailure, "Failed to connect to primary node."
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elsif @manager.read_pool.nil?
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close
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raise ConnectionFailure, "Failed to connect to any node."
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else
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@connected = true
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end
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end
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end
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# Determine whether a replica set refresh is
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# required. If so, run a hard refresh. You can
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# force a hard refresh by running
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# ReplSetConnection#hard_refresh!
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#
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# @return [Boolean] +true+ unless a hard refresh
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# is run and the refresh lock can't be acquired.
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def refresh(opts={})
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if !connected?
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log(:info, "Trying to check replica set health but not " +
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"connected...")
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return hard_refresh!
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end
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log(:debug, "Checking replica set connection health...")
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@manager.check_connection_health
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if @manager.refresh_required?
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return hard_refresh!
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end
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return true
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end
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# Force a hard refresh of this connection's view
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# of the replica set.
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#
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# @return [Boolean] +true+ if hard refresh
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# occurred. +false+ is returned when unable
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# to get the refresh lock.
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def hard_refresh!
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log(:info, "Initiating hard refresh...")
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discovered_seeds = @manager ? @manager.seeds : []
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new_manager = PoolManager.new(self, discovered_seeds | @seeds)
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new_manager.connect
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Thread.current[:manager] = new_manager
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# TODO: make sure that connect has succeeded
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@old_managers << @manager
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@manager = new_manager
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@refresh_version += 1
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return true
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end
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def connected?
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@connected && (@manager.primary_pool || @manager.read_pool)
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end
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# @deprecated
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def connecting?
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warn "ReplSetConnection#connecting? is deprecated and will be removed in v2.0."
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false
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end
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# The replica set primary's host name.
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#
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# @return [String]
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def host
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@manager.primary_pool.host
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end
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# The replica set primary's port.
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#
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# @return [Integer]
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def port
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@manager.primary_pool.port
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end
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def nodes
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warn "ReplSetConnection#nodes is DEPRECATED and will be removed in v2.0. " +
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"Please use ReplSetConnection#seeds instead."
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@seeds
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end
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# Determine whether we're reading from a primary node. If false,
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# this connection connects to a secondary node and @read_secondaries is true.
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#
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# @return [Boolean]
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def read_primary?
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@manager.read_pool == @manager.primary_pool
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end
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alias :primary? :read_primary?
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def read_preference
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@read
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end
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# Close the connection to the database.
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def close(opts={})
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if opts[:soft]
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@manager.close(:soft => true) if @manager
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else
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@manager.close if @manager
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end
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@connected = false
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end
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# If a ConnectionFailure is raised, this method will be called
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# to close the connection and reset connection values.
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# @deprecated
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def reset_connection
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close
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warn "ReplSetConnection#reset_connection is now deprecated and will be removed in v2.0. " +
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"Use ReplSetConnection#close instead."
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end
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# Returns +true+ if it's okay to read from a secondary node.
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# Since this is a replica set, this must always be true.
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#
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# This method exist primarily so that Cursor objects will
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# generate query messages with a slaveOkay value of +true+.
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#
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# @return [Boolean] +true+
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def slave_ok?
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true
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end
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def authenticate_pools
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if primary_pool
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primary_pool.authenticate_existing
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end
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secondary_pools.each do |pool|
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pool.authenticate_existing
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end
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end
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def logout_pools(db)
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if primary_pool
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primary_pool.logout_existing(db)
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end
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secondary_pools.each do |pool|
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pool.logout_existing(db)
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end
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end
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# Generic socket checkout
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# Takes a block that returns a socket from pool
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def checkout(&block)
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if connected?
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sync_refresh
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else
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connect
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end
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begin
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socket = block.call
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rescue => ex
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checkin(socket) if socket
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raise ex
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end
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if socket
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socket
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else
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@connected = false
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raise ConnectionFailure.new("Could not checkout a socket.")
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end
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end
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# Checkout best available socket by trying primary
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# pool first and then falling back to secondary.
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def checkout_best
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checkout do
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socket = get_socket_from_pool(:primary)
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if !socket
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connect
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socket = get_socket_from_pool(:secondary)
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end
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socket
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end
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end
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# Checkout a socket for reading (i.e., a secondary node).
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# Note that @read_pool might point to the primary pool
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# if no read pool has been defined.
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def checkout_reader
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checkout do
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socket = get_socket_from_pool(:read)
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if !socket
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connect
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socket = get_socket_from_pool(:primary)
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end
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socket
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end
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end
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# Checkout a socket from a secondary
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# For :read_preference => :secondary_only
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def checkout_secondary
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checkout do
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get_socket_from_pool(:secondary)
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end
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end
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# Checkout a socket for writing (i.e., a primary node).
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def checkout_writer
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checkout do
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get_socket_from_pool(:primary)
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end
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end
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# Checkin a socket used for reading.
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def checkin_reader(socket)
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if socket
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socket.pool.checkin(socket)
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end
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sync_refresh
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end
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# Checkin a socket used for writing.
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def checkin_writer(socket)
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if socket
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socket.pool.checkin(socket)
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end
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sync_refresh
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end
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def close_socket(socket)
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begin
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socket.close if socket
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rescue IOError
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log(:info, "Tried to close socket #{socket} but already closed.")
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end
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end
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def get_socket_from_pool(pool_type)
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if Thread.current[:manager] != @manager
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Thread.current[:manager] = @manager
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end
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pool = case pool_type
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when :primary
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primary_pool
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when :secondary
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secondary_pool
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when :read
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read_pool
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end
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begin
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if pool
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pool.checkout
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end
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rescue ConnectionFailure => ex
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log(:info, "Failed to checkout from #{pool} with #{ex.class}; #{ex.message}")
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return nil
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end
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end
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def local_manager
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Thread.current[:manager]
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end
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def arbiters
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local_manager.arbiters.nil? ? [] : local_manager.arbiters
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end
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def primary
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local_manager ? local_manager.primary : nil
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end
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# Note: might want to freeze these after connecting.
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def secondaries
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local_manager ? local_manager.secondaries : []
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end
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def hosts
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local_manager ? local_manager.hosts : []
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end
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def primary_pool
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local_manager ? local_manager.primary_pool : nil
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end
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def read_pool
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local_manager ? local_manager.read_pool : nil
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end
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def secondary_pool
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local_manager ? local_manager.secondary_pool : nil
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end
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def secondary_pools
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local_manager ? local_manager.secondary_pools : []
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end
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def tag_map
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local_manager ? local_manager.tag_map : {}
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end
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def max_bson_size
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if local_manager && local_manager.max_bson_size
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local_manager.max_bson_size
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else
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Mongo::DEFAULT_MAX_BSON_SIZE
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end
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end
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private
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# Parse option hash
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def setup(opts)
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# Require a primary node to connect?
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@require_primary = opts.fetch(:require_primary, true)
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# Refresh
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@refresh_mode = opts.fetch(:refresh_mode, false)
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@refresh_interval = opts[:refresh_interval] || 90
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if @refresh_mode == :async
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warn ":async refresh mode has been deprecated. Refresh
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mode will be disabled."
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elsif ![:sync, false].include?(@refresh_mode)
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raise MongoArgumentError,
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"Refresh mode must be either :sync or false."
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end
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# Are we allowing reads from secondaries?
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if opts[:read_secondary]
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warn ":read_secondary options has now been deprecated and will " +
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"be removed in driver v2.0. Use the :read option instead."
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@read_secondary = opts.fetch(:read_secondary, false)
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@read = :secondary
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else
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@read = opts.fetch(:read, :primary)
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Mongo::Support.validate_read_preference(@read)
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end
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# Replica set name
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if opts[:rs_name]
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warn ":rs_name option has been deprecated and will be removed in v2.0. " +
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"Please use :name instead."
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@replica_set_name = opts[:rs_name]
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else
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@replica_set_name = opts[:name]
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end
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opts[:connect_timeout] = opts[:connect_timeout] || 30
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super opts
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end
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# Checkout a socket connected to a node with one of
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# the provided tags. If no such node exists, raise
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# an exception.
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#
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# NOTE: will be available in driver release v2.0.
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def checkout_tagged(tags)
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tags.each do |k, v|
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pool = self.tag_map[{k.to_s => v}]
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if pool
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socket = pool.checkout
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return socket
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end
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end
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raise NodeWithTagsNotFound,
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"Could not find a connection tagged with #{tags}."
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end
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def prune_managers
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@old_managers.each do |manager|
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if manager != @manager
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if manager.closed?
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@old_managers.delete(manager)
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else
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manager.close(:soft => true)
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end
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end
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end
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end
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def sync_refresh
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if @refresh_mode == :sync &&
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((Time.now - @last_refresh) > @refresh_interval)
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@last_refresh = Time.now
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if @refresh_mutex.try_lock
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begin
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refresh
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prune_managers
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ensure
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@refresh_mutex.unlock
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end
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end
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end
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end
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end
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end
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