303 lines
8.3 KiB
Ruby
303 lines
8.3 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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module Mongo
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class Pool
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PRUNE_INTERVAL = 300
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PING_ATTEMPTS = 6
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MAX_PING_TIME = 1_000_000
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attr_accessor :host, :port, :address,
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:size, :timeout, :safe, :checked_out, :connection,
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:sockets_low
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# Create a new pool of connections.
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def initialize(connection, host, port, opts={})
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@connection = connection
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@host, @port = host, port
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# A Mongo::Node object.
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@node = opts[:node]
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# The string address
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@address = "#{@host}:#{@port}"
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# Pool size and timeout.
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@size = opts[:size] || 10000
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@timeout = opts[:timeout] || 5.0
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# Mutex for synchronizing pool access
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@connection_mutex = Mutex.new
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# Condition variable for signal and wait
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@queue = ConditionVariable.new
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# Operations to perform on a socket
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@socket_ops = Hash.new { |h, k| h[k] = [] }
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@sockets_low = true
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@sockets = []
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@pids = {}
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@checked_out = []
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@threads = {}
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@ping_time = nil
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@last_ping = nil
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@closed = false
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@last_pruning = Time.now
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end
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# Close this pool.
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#
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# @option opts [Boolean] :soft (false) If true,
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# close only those sockets that are not checked out.
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def close(opts={})
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@connection_mutex.synchronize do
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if opts[:soft]
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sockets_to_close = @sockets - @checked_out
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else
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sockets_to_close = @sockets
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end
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sockets_to_close.each do |sock|
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begin
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sock.close
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rescue IOError => ex
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warn "IOError when attempting to close socket connected to #{@host}:#{@port}: #{ex.inspect}"
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end
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end
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@sockets.clear
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@pids.clear
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@checked_out.clear
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@closed = true
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end
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end
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def closed?
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@closed
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end
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def sockets_low?
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@sockets_low
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end
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def inspect
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"#<Mongo::Pool:0x#{self.object_id.to_s(16)} @host=#{@host} @port=#{port} " +
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"@ping_time=#{@ping_time} #{@checked_out.size}/#{@size} sockets available.>"
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end
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def host_string
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"#{@host}:#{@port}"
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end
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def host_port
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[@host, @port]
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end
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# Refresh ping time only if we haven't
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# checked within the last five minutes.
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def ping_time
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if !@last_ping
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@last_ping = Time.now
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@ping_time = refresh_ping_time
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elsif Time.now - @last_ping > 300
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@last_ping = Time.now
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@ping_time = refresh_ping_time
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else
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@ping_time
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end
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end
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# Return the time it takes on average
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# to do a round-trip against this node.
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def refresh_ping_time
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trials = []
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PING_ATTEMPTS.times do
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t1 = Time.now
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if !self.ping
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return MAX_PING_TIME
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end
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trials << (Time.now - t1) * 1000
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end
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trials.sort!
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# Delete shortest and longest times
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trials.delete_at(trials.length-1)
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trials.delete_at(0)
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total = 0.0
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trials.each { |t| total += t }
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(total / trials.length).ceil
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end
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def ping
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begin
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return self.connection['admin'].command({:ping => 1}, :socket => @node.socket)
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rescue OperationFailure, SocketError, SystemCallError, IOError => ex
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return false
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end
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end
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# Return a socket to the pool.
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def checkin(socket)
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@connection_mutex.synchronize do
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@checked_out.delete(socket)
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@queue.signal
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end
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true
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end
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# Adds a new socket to the pool and checks it out.
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#
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# This method is called exclusively from #checkout;
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# therefore, it runs within a mutex.
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def checkout_new_socket
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begin
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socket = self.connection.socket_class.new(@host, @port)
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socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
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rescue => ex
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socket.close if socket
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raise ConnectionFailure, "Failed to connect to host #{@host} and port #{@port}: #{ex}"
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@node.close if @node
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end
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# If any saved authentications exist, we want to apply those
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# when creating new sockets.
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@connection.apply_saved_authentication(:socket => socket)
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@sockets << socket
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@pids[socket] = Process.pid
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@checked_out << socket
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@threads[socket] = Thread.current.object_id
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socket
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end
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# If a user calls DB#authenticate, and several sockets exist,
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# then we need a way to apply the authentication on each socket.
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# So we store the apply_authentication method, and this will be
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# applied right before the next use of each socket.
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def authenticate_existing
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@connection_mutex.synchronize do
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@sockets.each do |socket|
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@socket_ops[socket] << Proc.new do
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@connection.apply_saved_authentication(:socket => socket)
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end
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end
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end
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end
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# Store the logout op for each existing socket to be applied before
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# the next use of each socket.
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def logout_existing(db)
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@connection_mutex.synchronize do
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@sockets.each do |socket|
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@socket_ops[socket] << Proc.new do
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@connection.db(db).issue_logout(:socket => socket)
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end
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end
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end
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end
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# Checks out the first available socket from the pool.
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#
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# If the pid has changed, remove the socket and check out
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# new one.
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#
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# This method is called exclusively from #checkout;
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# therefore, it runs within a mutex.
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def checkout_existing_socket
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socket = (@sockets - @checked_out).first
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if @pids[socket] != Process.pid
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@pids[socket] = nil
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@sockets.delete(socket)
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socket.close if socket
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checkout_new_socket
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else
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@checked_out << socket
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@threads[socket] = Thread.current.object_id
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socket
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end
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end
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# If we have more sockets than the soft limit specified
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# by the max pool size, then we should prune those
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# extraneous sockets.
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#
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# Note: this must be called from within a mutex.
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def prune
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surplus = @size - @sockets.size
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return if surplus <= 0
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idle_sockets = @sockets - @checked_out
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[surplus, idle_sockets.length].min.times do |n|
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idle_sockets[n].close
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@sockets.delete(idle_sockets[n])
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end
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end
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# Check out an existing socket or create a new socket if the maximum
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# pool size has not been exceeded. Otherwise, wait for the next
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# available socket.
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def checkout
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@connection.connect if !@connection.connected?
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start_time = Time.now
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loop do
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if (Time.now - start_time) > @timeout
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raise ConnectionTimeoutError, "could not obtain connection within " +
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"#{@timeout} seconds. The max pool size is currently #{@size}; " +
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"consider increasing the pool size or timeout."
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end
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@connection_mutex.synchronize do
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if @size > 1000
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if @sockets.size > 0.7 * @size
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@sockets_low = true
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else
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@sockets_low = false
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end
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if (Time.now - @last_pruning) > PRUNE_INTERVAL
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prune
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@last_pruning = Time.now
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end
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end
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socket = if @checked_out.size < @sockets.size
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checkout_existing_socket
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else
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checkout_new_socket
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end
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if socket
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# This calls all procs, in order, scoped to existing sockets.
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# At the moment, we use this to lazily authenticate and
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# logout existing socket connections.
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@socket_ops[socket].reject! do |op|
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op.call
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end
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return socket
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else
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# Otherwise, wait
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@queue.wait(@connection_mutex)
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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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