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98 lines
2.9 KiB
98 lines
2.9 KiB
require 'fiber'
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require 'cartodb/sequel_connection_helper'
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module CartoDB
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class ConnectionPool
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include CartoDB::SequelConnectionHelper
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# Until migration to AR is done
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MAX_POOL_SIZE = 600
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def initialize
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@pool = {}
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end
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# Intended only for testing
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def all
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@pool
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end
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def fetch(configuration, &block)
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conn = nil
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if @pool[connection_id(configuration)]
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Rails.logger.debug "[pool] Found a connection for #{connection_id(configuration)} (#{@pool.keys.size})"
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@pool[connection_id(configuration)][:last_accessed] = Time.now
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conn = @pool[connection_id(configuration)][:connection]
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else
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conn = create_new_connection(configuration, &block)
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end
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# This conn may be still broken after 3 tries
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return conn
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end
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def max_pool_size?
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if @pool.size >= MAX_POOL_SIZE
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#close_connections!
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close_oldest_connection!
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end
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end
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def create_new_connection(configuration, &block)
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max_pool_size?
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connection = yield
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@pool[connection_id(configuration)] = { :connection => connection, :last_accessed => Time.now }
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Rails.logger.debug "[pool] Creating a new connection for #{connection_id(configuration)} (#{@pool.keys.size})"
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connection
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end
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def close_connections!(db=nil)
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newpool = {}
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@pool.each do |id, conn|
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if ! db || ( id.start_with? "#{db}:" )
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Rails.logger.debug "[pool] Dropping connection #{id}"
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close_connection(conn[:connection], id)
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else
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Rails.logger.debug "[pool] Not dropping connection #{id}"
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newpool[id] = conn
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end
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end
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@pool = newpool
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end
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def close_oldest_connection!
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older = nil
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oldest_access = nil
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@pool.each do |connection_id, conn|
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if oldest_access.nil? || conn[:last_accessed] < oldest_access
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oldest_access = conn[:last_accessed]
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older = connection_id
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end
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end
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close_connection(@pool[older][:connection], older)
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@pool.delete(older)
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end
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private
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def close_connection(connection, id)
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if id.end_with?('sequel')
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close_sequel_connection(connection)
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else
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connection.disconnect!
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end
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end
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def connection_id(configuration)
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# TODO: Due to migration from Sequel to ActiveRecord, afterwards can be used with only symbols
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host = configuration.fetch(:host, configuration['host'])
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database = configuration.fetch(:database, configuration['database'])
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username = configuration.fetch(:username, configuration['username'])
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orm = configuration.fetch(:orm, 'sequel')
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port = configuration.fetch(:port, configuration['port'])
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# Be aware of close_connections! and close_connection logic when prepending or appending new
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# parameters to the id.
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"#{host}:#{database}:#{port}:#{username}:#{orm}"
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end
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end
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end
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