46 lines
1.0 KiB
Ruby
46 lines
1.0 KiB
Ruby
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# frozen_string_literal: true
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require "resolv"
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module DiscourseAi
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module Utils
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module DnsSrv
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def self.lookup(domain)
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Discourse
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.cache
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.fetch("dns_srv_lookup:#{domain}", expires_in: 5.minutes) do
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resources = dns_srv_lookup_for_domain(domain)
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select_server(resources)
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end
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end
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private
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def self.dns_srv_lookup_for_domain(domain)
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resolver = Resolv::DNS.new
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resources = resolver.getresources(domain, Resolv::DNS::Resource::IN::SRV)
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end
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def self.select_server(resources)
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priority = resources.group_by(&:priority).keys.min
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priority_resources = resources.select { |r| r.priority == priority }
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total_weight = priority_resources.map(&:weight).sum
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random_weight = rand(total_weight)
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priority_resources.each do |resource|
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random_weight -= resource.weight
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return resource if random_weight < 0
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end
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# fallback
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resources.first
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end
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end
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end
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end
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