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multi_db_wrapper.rb
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multi_db_wrapper.rb
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require 'mock_redis/undef_redis_methods'
class MockRedis
class MultiDbWrapper
include UndefRedisMethods
def initialize(db)
@db_index = 0
@prototype_db = db.clone
@databases = Hash.new { |h, k| h[k] = @prototype_db.clone }
@databases[@db_index] = db
end
def respond_to?(method, include_private = false)
super || current_db.respond_to?(method, include_private)
end
def method_missing(method, *args, &block)
current_db.send(method, *args, &block)
end
def initialize_copy(source)
super
@databases = @databases.clone
@databases.each_key do |k|
@databases[k] = @databases[k].clone
end
end
# Redis commands
def flushall
@databases.values.each(&:flushdb)
'OK'
end
def move(key, db_index)
src = current_db
dest = db(db_index)
if !src.exists?(key) || dest.exists?(key)
false
else
case current_db.type(key)
when 'hash'
dest.hmset(key, *src.hgetall(key).map { |k, v| [k, v] }.flatten)
when 'list'
while value = src.rpop(key)
dest.lpush(key, value)
end
when 'set'
while value = src.spop(key)
dest.sadd(key, value)
end
when 'string'
dest.set(key, src.get(key))
when 'zset'
src.zrange(key, 0, -1, :with_scores => true).each do |(m, s)|
dest.zadd(key, s, m)
end
else
raise ArgumentError,
"Can't move a key of type #{current_db.type(key).inspect}"
end
src.del(key)
true
end
end
def select(db_index)
@db_index = db_index.to_i
'OK'
end
private
def current_db
@databases[@db_index]
end
def db(index)
@databases[index]
end
end
end