Rails connection management to handle Amazon Aurora's failover
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module xxx | |
class Application < Rails::Application | |
#(中略) | |
config.middleware.swap ActiveRecord::ConnectionAdapters::ConnectionManagement, | |
'ActiveRecord::ConnectionAdapters::ReconnectOnErrorManagement' | |
end | |
end |
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module ActiveRecord | |
module ConnectionAdapters | |
class ReconnectOnErrorManagement | |
CONNECTION_ERROR = ['Lost connection', 'gone away', '--read-only'] | |
CONNECTION_ERROR_RE = /#{CONNECTION_ERROR.map{|w|Regexp.escape(w)}.join('|')}/ | |
CONNECTION_ERROR_RE.freeze | |
def initialize(app) | |
@app = app | |
end | |
def call(env) | |
testing = env.key?('rack.test') | |
response = @app.call(env) | |
response[2] = ::Rack::BodyProxy.new(response[2]) do | |
ActiveRecord::Base.clear_active_connections! unless testing | |
end | |
response | |
rescue Exception => e | |
unless testing | |
if should_clear_all_connections?(e) | |
ActiveRecord::Base.clear_all_connections! | |
else | |
ActiveRecord::Base.clear_active_connections! | |
end | |
end | |
raise | |
end | |
def should_clear_all_connections?(e) | |
if e.kind_of?(ActiveRecord::StatementInvalid) | |
return CONNECTION_ERROR_RE === e.message | |
end | |
return false | |
end | |
end | |
end | |
end |
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