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5289fc7886
- Bump rails_failover for new per-backend callback feature - If the master backend fails over, make all sites readonly. And vice-versa for fallback - If a single backend fails over, make that individual site readonly. And vice-versa for fallback - When a single backend fails, also check connection to the master backend
88 lines
2.8 KiB
Ruby
88 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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if defined?(RailsFailover::Redis)
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message_bus_keepalive_interval = nil
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RailsFailover::Redis.on_failover do
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message_bus_keepalive_interval = MessageBus.keepalive_interval
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MessageBus.keepalive_interval = -1 # Disable MessageBus keepalive_interval
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Discourse.received_redis_readonly!
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end
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RailsFailover::Redis.on_fallback do
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Discourse.clear_redis_readonly!
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Discourse.request_refresh!
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MessageBus.keepalive_interval = message_bus_keepalive_interval
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ObjectSpace.each_object(DistributedCache) do |cache|
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cache.clear
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end
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SiteSetting.refresh!
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end
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if Rails.logger.respond_to? :chained
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RailsFailover::Redis.logger = Rails.logger.chained.first
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end
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end
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if defined?(RailsFailover::ActiveRecord)
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return unless Rails.configuration.active_record_rails_failover
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if Rails.configuration.multisite
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if ActiveRecord::Base.current_role == ActiveRecord::Base.reading_role
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RailsMultisite::ConnectionManagement.default_connection_handler =
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ActiveRecord::Base.connection_handlers[ActiveRecord::Base.reading_role]
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end
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end
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RailsFailover::ActiveRecord.on_failover do |role|
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if role == ActiveRecord::Base.writing_role # Multisite master
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RailsMultisite::ConnectionManagement.each_connection do
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Discourse.enable_readonly_mode(Discourse::PG_READONLY_MODE_KEY)
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end
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else
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ActiveRecord::Base.connected_to(role: role) do
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Discourse.enable_readonly_mode(Discourse::PG_READONLY_MODE_KEY)
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end
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# Test connection to the master, and trigger master failover if needed
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ActiveRecord::Base.connected_to(role: ActiveRecord::Base.writing_role) do
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ActiveRecord::Base.connection.active?
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rescue PG::ConnectionBad, PG::UnableToSend, PG::ServerError
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RailsFailover::ActiveRecord.verify_primary(ActiveRecord::Base.writing_role)
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end
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end
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end
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RailsFailover::ActiveRecord.on_fallback do |role|
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if role == ActiveRecord::Base.writing_role # Multisite master
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RailsMultisite::ConnectionManagement.each_connection do
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Discourse.disable_readonly_mode(Discourse::PG_READONLY_MODE_KEY)
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end
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else
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ActiveRecord::Base.connected_to(role: role) do
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Discourse.disable_readonly_mode(Discourse::PG_READONLY_MODE_KEY)
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end
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end
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if Rails.configuration.multisite
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RailsMultisite::ConnectionManagement.default_connection_handler =
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ActiveRecord::Base.connection_handlers[ActiveRecord::Base.writing_role]
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end
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end
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RailsFailover::ActiveRecord.register_force_reading_role_callback do
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Discourse.redis.exists?(
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Discourse::PG_READONLY_MODE_KEY,
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Discourse::PG_FORCE_READONLY_MODE_KEY
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)
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rescue => e
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if !e.is_a?(Redis::CannotConnectError)
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Rails.logger.warn "#{e.class} #{e.message}: #{e.backtrace.join("\n")}"
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end
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false
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end
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end
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