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Contents
# inspiration from:
# https://devcenter.heroku.com/articles/concurrency-and-database-connections#multi-process-servers
# https://devcenter.heroku.com/articles/postgres-logs-errors#pgerror-prepared-statement-a30-already-exists
# http://stackoverflow.com/questions/8118074/is-the-prepared-statement-cache-cleared-per-request-in-rails-3-1
# http://stackoverflow.com/questions/16775795/rails-switch-connection-on-each-request-but-keep-a-connection-pool
module RooOnRails
module Rack
# Cleans up Rails database connections on timeouts, before they're returned
# to the pool.
#
# In particular, this clears the prepared statement cache, which can become
# corrupted as ActiveRecord isn't interrupt-safe.
class SafeTimeouts
def initialize(app)
@app = app
end
def call(env)
@app.call(env)
rescue ::Rack::Timeout::Error, ::Rack::Timeout::RequestTimeoutException
Rails.logger.warn('Clearing ActiveRecord connection cache due to timeout')
ActiveRecord::Base.connection.clear_cache!
raise
end
end
end
end
Version data entries
33 entries across 33 versions & 1 rubygems