discourse/lib/freedom_patches/schema_cache_concurrency.rb

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# frozen_string_literal: true
#
# Rails has a circular dependency in SchemaCache.
# In certain situation SchemaCache can carry a @connection
# from a different thread. This causes potential concurrency bugs
# in Sidekiq.
#
# This patches it so it is less flexible (theoretically) but always bound to the current connection
# This patch needs to be reviewed in future versions of Rails.
# We should consider upstreaming this optionally.
module ActiveRecord
module ConnectionAdapters
class SchemaCache
def connection=(connection)
# AbstractPool get_schema_cache does schema_cache.connection = connection
Thread.current["schema_cached_connection"] = connection
end
def connection
Thread.current["schema_cached_connection"]
end
end
end
end