mirror of
https://github.com/jimeh/amqp-failover.git
synced 2026-02-19 10:56:44 +00:00
109 lines
2.8 KiB
Ruby
109 lines
2.8 KiB
Ruby
# encoding: utf-8
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require 'yaml'
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require 'amqp/failover_client'
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require 'amqp/failover/config'
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require 'amqp/failover/configurations'
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require 'amqp/failover/logger'
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require 'amqp/failover/server_discovery'
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require 'amqp/failover/version'
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require 'amqp/failover/ext/amqp/client.rb'
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module AMQP
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class Failover
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attr_reader :latest_failed
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attr_accessor :primary
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attr_accessor :retry_timeout
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attr_accessor :fallback
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def initialize(confs = nil, opts = {})
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@configs = Failover::Configurations.new(confs)
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@options = default_options.merge(opts)
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end
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# pluggable logger specifically for tracking failover and fallbacks
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def self.logger
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@logger ||= Logger.new
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end
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def default_options
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{ :retry_timeout => 1,
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:selection => :sequential, #TODO: Impliment next server selection algorithm
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:fallback => false, #TODO: Enable by default once a sane solution is found
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:fallback_interval => 10 }
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end
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def options
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@options ||= {}
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end
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def fallback_interval
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options[:fallback_interval] ||= default_options[:fallback_interval]
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end
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def primary
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configs[:primary]
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end
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def refs
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@refs ||= {}
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end
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def configs
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@configs ||= Configurations.new
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end
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def add_config(conf = {}, ref = nil)
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index = configs.index(conf)
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configs << Config::Failed.new(conf) if index.nil?
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refs[ref] = (index || configs.index(conf)) if !ref.nil?
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end
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def failover_from(conf = {}, time = nil)
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failed_with(conf, nil, time)
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next_config
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end
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alias :from :failover_from
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def failed_with(conf = {}, ref = nil, time = nil)
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time ||= Time.now
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if index = configs.index(conf)
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configs[index].last_fail = time
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@latest_failed = configs[index]
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else
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configs << Config::Failed.new(conf, time)
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@latest_failed = configs.last
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end
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refs[ref] = (index || configs.index(conf)) if !ref.nil?
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end
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def next_config(retry_timeout = nil, after = nil)
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return nil if configs.size <= 1
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retry_timeout ||= @options[:retry_timeout]
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after ||= @latest_failed
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index = configs.index(after)
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available = (index > 0) ? configs[index+1..-1] + configs[0..index-1] : configs[1..-1]
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available.each do |conf|
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return conf if conf.last_fail.nil? || (conf.last_fail + retry_timeout.seconds) < Time.now
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end
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return nil
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end
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def last_fail_of(match)
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((match.is_a?(Hash) ? get_by_conf(match) : get_by_ref(match)) || Config::Failed.new).last_fail
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end
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def get_by_conf(conf = {})
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configs[configs.index(conf)]
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end
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def get_by_ref(ref = nil)
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configs[refs[ref]] if refs[ref]
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end
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end # Failover
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end # AMQP
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