discourse/lib/discourse_redis.rb

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#
# A wrapper around redis that namespaces keys with the current site id
#
require_dependency 'cache'
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class DiscourseRedis
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def self.raw_connection(config = nil)
config ||= self.config
Redis.new(config)
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end
def self.config
GlobalSetting.redis_config
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end
def initialize(config=nil)
@config = config || DiscourseRedis.config
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@redis = DiscourseRedis.raw_connection(@config)
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end
def without_namespace
# Only use this if you want to store and fetch data that's shared between sites
@redis
end
def self.ignore_readonly
yield
rescue Redis::CommandError => ex
if ex.message =~ /READONLY/
unless Discourse.recently_readonly?
STDERR.puts "WARN: Redis is in a readonly state. Performed a noop"
end
Discourse.received_readonly!
else
raise ex
end
end
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# prefix the key with the namespace
def method_missing(meth, *args, &block)
if @redis.respond_to?(meth)
DiscourseRedis.ignore_readonly { @redis.send(meth, *args, &block) }
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else
super
end
end
# Proxy key methods through, but prefix the keys with the namespace
[:append, :blpop, :brpop, :brpoplpush, :decr, :decrby, :exists, :expire, :expireat, :get, :getbit, :getrange, :getset,
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:hdel, :hexists, :hget, :hgetall, :hincrby, :hincrbyfloat, :hkeys, :hlen, :hmget, :hmset, :hset, :hsetnx, :hvals, :incr,
:incrby, :incrbyfloat, :lindex, :linsert, :llen, :lpop, :lpush, :lpushx, :lrange, :lrem, :lset, :ltrim,
:mapped_hmset, :mapped_hmget, :mapped_mget, :mapped_mset, :mapped_msetnx, :mget, :move, :mset,
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:msetnx, :persist, :pexpire, :pexpireat, :psetex, :pttl, :rename, :renamenx, :rpop, :rpoplpush, :rpush, :rpushx, :sadd, :scard,
:sdiff, :set, :setbit, :setex, :setnx, :setrange, :sinter, :sismember, :smembers, :sort, :spop, :srandmember, :srem, :strlen,
:sunion, :ttl, :type, :watch, :zadd, :zcard, :zcount, :zincrby, :zrange, :zrangebyscore, :zrank, :zrem, :zremrangebyrank,
:zremrangebyscore, :zrevrange, :zrevrangebyscore, :zrevrank, :zrangebyscore].each do |m|
define_method m do |*args|
args[0] = "#{namespace}:#{args[0]}"
DiscourseRedis.ignore_readonly { @redis.send(m, *args) }
end
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end
def del(k)
DiscourseRedis.ignore_readonly do
k = "#{namespace}:#{k}"
@redis.del k
end
end
def keys(pattern=nil)
DiscourseRedis.ignore_readonly do
len = namespace.length + 1
@redis.keys("#{namespace}:#{pattern || '*'}").map{
|k| k[len..-1]
}
end
end
def delete_prefixed(prefix)
DiscourseRedis.ignore_readonly do
keys("#{prefix}*").each { |k| $redis.del(k) }
end
end
def flushdb
DiscourseRedis.ignore_readonly do
keys.each{|k| del(k)}
end
end
def reconnect
@redis.client.reconnect
end
def namespace
RailsMultisite::ConnectionManagement.current_db
end
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def self.namespace
Rails.logger.warn("DiscourseRedis.namespace is going to be deprecated, do not use it!")
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RailsMultisite::ConnectionManagement.current_db
end
def self.new_redis_store
Cache.new
end
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end