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--[[
Copyright (C) 2016 ZTE, Inc. and others. All rights reserved. (ZTE)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--]]
-- unified layer to access back DB, using two levels of cache mechanism(LRUCache and shcache)
local _M = {}
_M._VERSION = '1.0.0'
local cache = require('lib.tools.db_cache')
local dao = require('dao.dao')
local msbConf = require('conf.msbinit')
local cjson_safe = require "cjson.safe"
local cacheConf = msbConf.cacheConf
local lru_ttl = cacheConf.lru_ttl or 10
function _M.load_serviceinfo(key)
-- Try to get from cache
local cached_value = cache.get(key)
if cached_value then
if cache.is_empty(cached_value) then
return nil
end
return cached_value
end
-- Get from shcache or backend redis
local svcinfo_str = dao.load_serviceinfo(key)
local value,err
if svcinfo_str then
value, err = cjson_safe.decode(svcinfo_str)
if err then
value = nil
ngx.log(ngx.WARN, "decode service info error: ", err, " service info: ", svcinfo_str)
end
else
value = nil
end
cache.set(key, value, lru_ttl)
return value
end
function _M.load_backservers(keypattern)
local value, err
-- Try to get from cache
value = cache.get(keypattern)
if not value then
-- Get from shcache or backend redis
value = dao.load_backservers(keypattern)
cache.set(keypattern, value, lru_ttl)
end
if cache.is_empty(value) then
return nil
end
return value
end
function _M.load_customsvcnames(keypattern)
local value, err
-- Try to get from cache
value = cache.get(keypattern)
if not value then
-- Get from shcache or backend redis
value = dao.load_customsvcnames(keypattern)
cache.set(keypattern, value, lru_ttl)
end
if cache.is_empty(value) then
return nil
end
return value
end
return _M
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