discourse/lib/redis_snapshot.rb

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# frozen_string_literal: true
class RedisSnapshot
def self.begin_faux_transaction(redis = Discourse.redis)
@stack ||= []
@stack.push(RedisSnapshot.load(redis))
end
def self.end_faux_transaction(redis = Discourse.redis)
@stack.pop.restore(redis)
end
def self.load(redis = Discourse.redis)
keys = redis.keys
values = redis.pipelined { |batch| keys.each { |key| batch.dump(key) } }
new(keys.zip(values).delete_if { |k, v| v.nil? })
end
def initialize(dump)
@dump = dump
end
def restore(redis = Discourse.redis)
redis.pipelined do |batch|
batch.flushdb
@dump.each { |key, value| batch.restore(key, 0, value) }
end
nil
end
end