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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.
--]]
--This module integrates the shcache with an abstraction for various databases(redis and so on)
local _M = {}
_M._VERSION = '1.0.0'
local shcache = require("vendor.shcache")
local cjson_safe = require "cjson.safe"
local msbConf = require('conf.msbinit')
local DB = require('dao.redis_db')
local options = msbConf.redisConf
local cacheConf = msbConf.cacheConf
local positive_ttl = cacheConf.positive_ttl or 60
local negative_ttl = cacheConf.negative_ttl or 2
local actualize_ttl = cacheConf.actualize_ttl or 120
local svc_shcache = ngx.shared.svc_cache
local function load_serviceinfo(key)
-- closure to perform external lookup to redis
local fetch_svcinfo_from_db = function ()
local _db = DB:new(options)
return _db:getserviceinfo(key)
end
local svcinfo_cache_table = shcache:new(
svc_shcache,
{ external_lookup = fetch_svcinfo_from_db,
--encode = cmsgpack.pack,
--encode = cjson_safe.encode,
--decode = cmsgpack.unpack
--decode = cjson_safe.decode
},
{ positive_ttl = positive_ttl, -- default cache good data for 60s
negative_ttl = negative_ttl, -- default cache failed lookup for 5s
actualize_ttl = actualize_ttl,
name = 'svcinfo_cache' -- "named" cache, useful for debug / report
}
)
local serviceinfo, from_cache = svcinfo_cache_table:load(key)
return serviceinfo
end
_M.load_serviceinfo = load_serviceinfo
local function load_backservers(keypattern)
-- closure to perform external lookup to redis
local fetch_servers_from_db = function ()
local _db = DB:new(options)
return _db:getbackservers(keypattern)
end
local servers_cache_table = shcache:new(
svc_shcache,
{ external_lookup = fetch_servers_from_db,
--encode = cmsgpack.pack,
encode = cjson_safe.encode,
--decode = cmsgpack.unpack
decode = cjson_safe.decode
},
{ positive_ttl = positive_ttl, -- default cache good data for 60s
negative_ttl = negative_ttl, -- default cache failed lookup for 5s
name = 'servers_cache' -- "named" cache, useful for debug / report
}
)
local servers_table, from_cache = servers_cache_table:load(keypattern)
return servers_table
end
_M.load_backservers = load_backservers
local function load_customsvcnames(keypattern)
-- closure to perform external lookup to redis
local fetch_svcnames_from_db = function ()
local _db = DB:new(options)
return _db:getcustomsvcnames(keypattern)
end
local svcnames_cache_table = shcache:new(
svc_shcache,
{ external_lookup = fetch_svcnames_from_db,
--encode = cmsgpack.pack,
encode = cjson_safe.encode,
--decode = cmsgpack.unpack
decode = cjson_safe.decode
},
{ positive_ttl = positive_ttl, -- default cache good data for 60s
negative_ttl = negative_ttl, -- default cache failed lookup for 5s
actualize_ttl = actualize_ttl,
name = 'svcnames_cache' -- "named" cache, useful for debug / report
}
)
local service_names, from_cache = svcnames_cache_table:load(keypattern)
return service_names
end
_M.load_customsvcnames = load_customsvcnames
return _M
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